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 static struct kmem_cache *p9_req_cache; 246 247 /** 248 * p9_req_alloc - Allocate a new request. 249 * @c: Client session. 250 * @type: Transaction type. 251 * @max_size: Maximum packet size for this request. 252 * 253 * Context: Process context. 254 * Return: Pointer to new request. 255 */ 256 static struct p9_req_t * 257 p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size) 258 { 259 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); 260 int alloc_msize = min(c->msize, max_size); 261 int tag; 262 263 if (!req) 264 return NULL; 265 266 req->tc = p9_fcall_alloc(alloc_msize); 267 req->rc = p9_fcall_alloc(alloc_msize); 268 if (!req->tc || !req->rc) 269 goto free; 270 271 p9pdu_reset(req->tc); 272 p9pdu_reset(req->rc); 273 req->status = REQ_STATUS_ALLOC; 274 init_waitqueue_head(&req->wq); 275 INIT_LIST_HEAD(&req->req_list); 276 277 idr_preload(GFP_NOFS); 278 spin_lock_irq(&c->lock); 279 if (type == P9_TVERSION) 280 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1, 281 GFP_NOWAIT); 282 else 283 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT); 284 req->tc->tag = tag; 285 spin_unlock_irq(&c->lock); 286 idr_preload_end(); 287 if (tag < 0) 288 goto free; 289 290 return req; 291 292 free: 293 kfree(req->tc); 294 kfree(req->rc); 295 kmem_cache_free(p9_req_cache, req); 296 return ERR_PTR(-ENOMEM); 297 } 298 299 /** 300 * p9_tag_lookup - Look up a request by tag. 301 * @c: Client session. 302 * @tag: Transaction ID. 303 * 304 * Context: Any context. 305 * Return: A request, or %NULL if there is no request with that tag. 306 */ 307 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 308 { 309 struct p9_req_t *req; 310 311 rcu_read_lock(); 312 req = idr_find(&c->reqs, tag); 313 /* There's no refcount on the req; a malicious server could cause 314 * us to dereference a NULL pointer 315 */ 316 rcu_read_unlock(); 317 318 return req; 319 } 320 EXPORT_SYMBOL(p9_tag_lookup); 321 322 /** 323 * p9_free_req - Free a request. 324 * @c: Client session. 325 * @r: Request to free. 326 * 327 * Context: Any context. 328 */ 329 static void p9_free_req(struct p9_client *c, struct p9_req_t *r) 330 { 331 unsigned long flags; 332 u16 tag = r->tc->tag; 333 334 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); 335 spin_lock_irqsave(&c->lock, flags); 336 idr_remove(&c->reqs, tag); 337 spin_unlock_irqrestore(&c->lock, flags); 338 kfree(r->tc); 339 kfree(r->rc); 340 kmem_cache_free(p9_req_cache, r); 341 } 342 343 /** 344 * p9_tag_cleanup - cleans up tags structure and reclaims resources 345 * @c: v9fs client struct 346 * 347 * This frees resources associated with the tags structure 348 * 349 */ 350 static void p9_tag_cleanup(struct p9_client *c) 351 { 352 struct p9_req_t *req; 353 int id; 354 355 rcu_read_lock(); 356 idr_for_each_entry(&c->reqs, req, id) { 357 pr_info("Tag %d still in use\n", id); 358 p9_free_req(c, req); 359 } 360 rcu_read_unlock(); 361 } 362 363 /** 364 * p9_client_cb - call back from transport to client 365 * c: client state 366 * req: request received 367 * 368 */ 369 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) 370 { 371 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag); 372 373 /* 374 * This barrier is needed to make sure any change made to req before 375 * the status change is visible to another thread 376 */ 377 smp_wmb(); 378 req->status = status; 379 380 wake_up(&req->wq); 381 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag); 382 } 383 EXPORT_SYMBOL(p9_client_cb); 384 385 /** 386 * p9_parse_header - parse header arguments out of a packet 387 * @pdu: packet to parse 388 * @size: size of packet 389 * @type: type of request 390 * @tag: tag of packet 391 * @rewind: set if we need to rewind offset afterwards 392 */ 393 394 int 395 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, 396 int rewind) 397 { 398 int8_t r_type; 399 int16_t r_tag; 400 int32_t r_size; 401 int offset = pdu->offset; 402 int err; 403 404 pdu->offset = 0; 405 406 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 407 if (err) 408 goto rewind_and_exit; 409 410 if (type) 411 *type = r_type; 412 if (tag) 413 *tag = r_tag; 414 if (size) 415 *size = r_size; 416 417 if (pdu->size != r_size || r_size < 7) { 418 err = -EINVAL; 419 goto rewind_and_exit; 420 } 421 422 pdu->id = r_type; 423 pdu->tag = r_tag; 424 425 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 426 pdu->size, pdu->id, pdu->tag); 427 428 rewind_and_exit: 429 if (rewind) 430 pdu->offset = offset; 431 return err; 432 } 433 EXPORT_SYMBOL(p9_parse_header); 434 435 /** 436 * p9_check_errors - check 9p packet for error return and process it 437 * @c: current client instance 438 * @req: request to parse and check for error conditions 439 * 440 * returns error code if one is discovered, otherwise returns 0 441 * 442 * this will have to be more complicated if we have multiple 443 * error packet types 444 */ 445 446 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 447 { 448 int8_t type; 449 int err; 450 int ecode; 451 452 err = p9_parse_header(req->rc, NULL, &type, NULL, 0); 453 if (req->rc->size >= c->msize) { 454 p9_debug(P9_DEBUG_ERROR, 455 "requested packet size too big: %d\n", 456 req->rc->size); 457 return -EIO; 458 } 459 /* 460 * dump the response from server 461 * This should be after check errors which poplulate pdu_fcall. 462 */ 463 trace_9p_protocol_dump(c, req->rc); 464 if (err) { 465 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 466 return err; 467 } 468 if (type != P9_RERROR && type != P9_RLERROR) 469 return 0; 470 471 if (!p9_is_proto_dotl(c)) { 472 char *ename; 473 err = p9pdu_readf(req->rc, c->proto_version, "s?d", 474 &ename, &ecode); 475 if (err) 476 goto out_err; 477 478 if (p9_is_proto_dotu(c) && ecode < 512) 479 err = -ecode; 480 481 if (!err) { 482 err = p9_errstr2errno(ename, strlen(ename)); 483 484 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 485 -ecode, ename); 486 } 487 kfree(ename); 488 } else { 489 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); 490 err = -ecode; 491 492 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 493 } 494 495 return err; 496 497 out_err: 498 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 499 500 return err; 501 } 502 503 /** 504 * p9_check_zc_errors - check 9p packet for error return and process it 505 * @c: current client instance 506 * @req: request to parse and check for error conditions 507 * @in_hdrlen: Size of response protocol buffer. 508 * 509 * returns error code if one is discovered, otherwise returns 0 510 * 511 * this will have to be more complicated if we have multiple 512 * error packet types 513 */ 514 515 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req, 516 struct iov_iter *uidata, int in_hdrlen) 517 { 518 int err; 519 int ecode; 520 int8_t type; 521 char *ename = NULL; 522 523 err = p9_parse_header(req->rc, NULL, &type, NULL, 0); 524 /* 525 * dump the response from server 526 * This should be after parse_header which poplulate pdu_fcall. 527 */ 528 trace_9p_protocol_dump(c, req->rc); 529 if (err) { 530 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 531 return err; 532 } 533 534 if (type != P9_RERROR && type != P9_RLERROR) 535 return 0; 536 537 if (!p9_is_proto_dotl(c)) { 538 /* Error is reported in string format */ 539 int len; 540 /* 7 = header size for RERROR; */ 541 int inline_len = in_hdrlen - 7; 542 543 len = req->rc->size - req->rc->offset; 544 if (len > (P9_ZC_HDR_SZ - 7)) { 545 err = -EFAULT; 546 goto out_err; 547 } 548 549 ename = &req->rc->sdata[req->rc->offset]; 550 if (len > inline_len) { 551 /* We have error in external buffer */ 552 if (!copy_from_iter_full(ename + inline_len, 553 len - inline_len, uidata)) { 554 err = -EFAULT; 555 goto out_err; 556 } 557 } 558 ename = NULL; 559 err = p9pdu_readf(req->rc, c->proto_version, "s?d", 560 &ename, &ecode); 561 if (err) 562 goto out_err; 563 564 if (p9_is_proto_dotu(c) && ecode < 512) 565 err = -ecode; 566 567 if (!err) { 568 err = p9_errstr2errno(ename, strlen(ename)); 569 570 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 571 -ecode, ename); 572 } 573 kfree(ename); 574 } else { 575 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); 576 err = -ecode; 577 578 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 579 } 580 return err; 581 582 out_err: 583 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 584 return err; 585 } 586 587 static struct p9_req_t * 588 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 589 590 /** 591 * p9_client_flush - flush (cancel) a request 592 * @c: client state 593 * @oldreq: request to cancel 594 * 595 * This sents a flush for a particular request and links 596 * the flush request to the original request. The current 597 * code only supports a single flush request although the protocol 598 * allows for multiple flush requests to be sent for a single request. 599 * 600 */ 601 602 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 603 { 604 struct p9_req_t *req; 605 int16_t oldtag; 606 int err; 607 608 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); 609 if (err) 610 return err; 611 612 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 613 614 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 615 if (IS_ERR(req)) 616 return PTR_ERR(req); 617 618 /* 619 * if we haven't received a response for oldreq, 620 * remove it from the list 621 */ 622 if (oldreq->status == REQ_STATUS_SENT) 623 if (c->trans_mod->cancelled) 624 c->trans_mod->cancelled(c, oldreq); 625 626 p9_free_req(c, req); 627 return 0; 628 } 629 630 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 631 int8_t type, int req_size, 632 const char *fmt, va_list ap) 633 { 634 int err; 635 struct p9_req_t *req; 636 637 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 638 639 /* we allow for any status other than disconnected */ 640 if (c->status == Disconnected) 641 return ERR_PTR(-EIO); 642 643 /* if status is begin_disconnected we allow only clunk request */ 644 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) 645 return ERR_PTR(-EIO); 646 647 req = p9_tag_alloc(c, type, req_size); 648 if (IS_ERR(req)) 649 return req; 650 651 /* marshall the data */ 652 p9pdu_prepare(req->tc, req->tc->tag, type); 653 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap); 654 if (err) 655 goto reterr; 656 p9pdu_finalize(c, req->tc); 657 trace_9p_client_req(c, type, req->tc->tag); 658 return req; 659 reterr: 660 p9_free_req(c, req); 661 return ERR_PTR(err); 662 } 663 664 /** 665 * p9_client_rpc - issue a request and wait for a response 666 * @c: client session 667 * @type: type of request 668 * @fmt: protocol format string (see protocol.c) 669 * 670 * Returns request structure (which client must free using p9_free_req) 671 */ 672 673 static struct p9_req_t * 674 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 675 { 676 va_list ap; 677 int sigpending, err; 678 unsigned long flags; 679 struct p9_req_t *req; 680 681 va_start(ap, fmt); 682 req = p9_client_prepare_req(c, type, c->msize, fmt, ap); 683 va_end(ap); 684 if (IS_ERR(req)) 685 return req; 686 687 if (signal_pending(current)) { 688 sigpending = 1; 689 clear_thread_flag(TIF_SIGPENDING); 690 } else 691 sigpending = 0; 692 693 err = c->trans_mod->request(c, req); 694 if (err < 0) { 695 if (err != -ERESTARTSYS && err != -EFAULT) 696 c->status = Disconnected; 697 goto recalc_sigpending; 698 } 699 again: 700 /* Wait for the response */ 701 err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD); 702 703 /* 704 * Make sure our req is coherent with regard to updates in other 705 * threads - echoes to wmb() in the callback 706 */ 707 smp_rmb(); 708 709 if ((err == -ERESTARTSYS) && (c->status == Connected) 710 && (type == P9_TFLUSH)) { 711 sigpending = 1; 712 clear_thread_flag(TIF_SIGPENDING); 713 goto again; 714 } 715 716 if (req->status == REQ_STATUS_ERROR) { 717 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 718 err = req->t_err; 719 } 720 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 721 p9_debug(P9_DEBUG_MUX, "flushing\n"); 722 sigpending = 1; 723 clear_thread_flag(TIF_SIGPENDING); 724 725 if (c->trans_mod->cancel(c, req)) 726 p9_client_flush(c, req); 727 728 /* if we received the response anyway, don't signal error */ 729 if (req->status == REQ_STATUS_RCVD) 730 err = 0; 731 } 732 recalc_sigpending: 733 if (sigpending) { 734 spin_lock_irqsave(¤t->sighand->siglock, flags); 735 recalc_sigpending(); 736 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 737 } 738 if (err < 0) 739 goto reterr; 740 741 err = p9_check_errors(c, req); 742 trace_9p_client_res(c, type, req->rc->tag, err); 743 if (!err) 744 return req; 745 reterr: 746 p9_free_req(c, req); 747 return ERR_PTR(safe_errno(err)); 748 } 749 750 /** 751 * p9_client_zc_rpc - issue a request and wait for a response 752 * @c: client session 753 * @type: type of request 754 * @uidata: destination for zero copy read 755 * @uodata: source for zero copy write 756 * @inlen: read buffer size 757 * @olen: write buffer size 758 * @hdrlen: reader header size, This is the size of response protocol data 759 * @fmt: protocol format string (see protocol.c) 760 * 761 * Returns request structure (which client must free using p9_free_req) 762 */ 763 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 764 struct iov_iter *uidata, 765 struct iov_iter *uodata, 766 int inlen, int olen, int in_hdrlen, 767 const char *fmt, ...) 768 { 769 va_list ap; 770 int sigpending, err; 771 unsigned long flags; 772 struct p9_req_t *req; 773 774 va_start(ap, fmt); 775 /* 776 * We allocate a inline protocol data of only 4k bytes. 777 * The actual content is passed in zero-copy fashion. 778 */ 779 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); 780 va_end(ap); 781 if (IS_ERR(req)) 782 return req; 783 784 if (signal_pending(current)) { 785 sigpending = 1; 786 clear_thread_flag(TIF_SIGPENDING); 787 } else 788 sigpending = 0; 789 790 err = c->trans_mod->zc_request(c, req, uidata, uodata, 791 inlen, olen, in_hdrlen); 792 if (err < 0) { 793 if (err == -EIO) 794 c->status = Disconnected; 795 if (err != -ERESTARTSYS) 796 goto recalc_sigpending; 797 } 798 if (req->status == REQ_STATUS_ERROR) { 799 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 800 err = req->t_err; 801 } 802 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 803 p9_debug(P9_DEBUG_MUX, "flushing\n"); 804 sigpending = 1; 805 clear_thread_flag(TIF_SIGPENDING); 806 807 if (c->trans_mod->cancel(c, req)) 808 p9_client_flush(c, req); 809 810 /* if we received the response anyway, don't signal error */ 811 if (req->status == REQ_STATUS_RCVD) 812 err = 0; 813 } 814 recalc_sigpending: 815 if (sigpending) { 816 spin_lock_irqsave(¤t->sighand->siglock, flags); 817 recalc_sigpending(); 818 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 819 } 820 if (err < 0) 821 goto reterr; 822 823 err = p9_check_zc_errors(c, req, uidata, in_hdrlen); 824 trace_9p_client_res(c, type, req->rc->tag, err); 825 if (!err) 826 return req; 827 reterr: 828 p9_free_req(c, req); 829 return ERR_PTR(safe_errno(err)); 830 } 831 832 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 833 { 834 int ret; 835 struct p9_fid *fid; 836 837 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 838 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 839 if (!fid) 840 return NULL; 841 842 memset(&fid->qid, 0, sizeof(struct p9_qid)); 843 fid->mode = -1; 844 fid->uid = current_fsuid(); 845 fid->clnt = clnt; 846 fid->rdir = NULL; 847 fid->fid = 0; 848 849 idr_preload(GFP_KERNEL); 850 spin_lock_irq(&clnt->lock); 851 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, 852 GFP_NOWAIT); 853 spin_unlock_irq(&clnt->lock); 854 idr_preload_end(); 855 856 if (!ret) 857 return fid; 858 859 kfree(fid); 860 return NULL; 861 } 862 863 static void p9_fid_destroy(struct p9_fid *fid) 864 { 865 struct p9_client *clnt; 866 unsigned long flags; 867 868 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 869 clnt = fid->clnt; 870 spin_lock_irqsave(&clnt->lock, flags); 871 idr_remove(&clnt->fids, fid->fid); 872 spin_unlock_irqrestore(&clnt->lock, flags); 873 kfree(fid->rdir); 874 kfree(fid); 875 } 876 877 static int p9_client_version(struct p9_client *c) 878 { 879 int err = 0; 880 struct p9_req_t *req; 881 char *version = NULL; 882 int msize; 883 884 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 885 c->msize, c->proto_version); 886 887 switch (c->proto_version) { 888 case p9_proto_2000L: 889 req = p9_client_rpc(c, P9_TVERSION, "ds", 890 c->msize, "9P2000.L"); 891 break; 892 case p9_proto_2000u: 893 req = p9_client_rpc(c, P9_TVERSION, "ds", 894 c->msize, "9P2000.u"); 895 break; 896 case p9_proto_legacy: 897 req = p9_client_rpc(c, P9_TVERSION, "ds", 898 c->msize, "9P2000"); 899 break; 900 default: 901 return -EINVAL; 902 } 903 904 if (IS_ERR(req)) 905 return PTR_ERR(req); 906 907 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version); 908 if (err) { 909 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 910 trace_9p_protocol_dump(c, req->rc); 911 goto error; 912 } 913 914 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 915 if (!strncmp(version, "9P2000.L", 8)) 916 c->proto_version = p9_proto_2000L; 917 else if (!strncmp(version, "9P2000.u", 8)) 918 c->proto_version = p9_proto_2000u; 919 else if (!strncmp(version, "9P2000", 6)) 920 c->proto_version = p9_proto_legacy; 921 else { 922 err = -EREMOTEIO; 923 goto error; 924 } 925 926 if (msize < c->msize) 927 c->msize = msize; 928 929 error: 930 kfree(version); 931 p9_free_req(c, req); 932 933 return err; 934 } 935 936 struct p9_client *p9_client_create(const char *dev_name, char *options) 937 { 938 int err; 939 struct p9_client *clnt; 940 char *client_id; 941 942 err = 0; 943 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 944 if (!clnt) 945 return ERR_PTR(-ENOMEM); 946 947 clnt->trans_mod = NULL; 948 clnt->trans = NULL; 949 950 client_id = utsname()->nodename; 951 memcpy(clnt->name, client_id, strlen(client_id) + 1); 952 953 spin_lock_init(&clnt->lock); 954 idr_init(&clnt->fids); 955 idr_init(&clnt->reqs); 956 957 err = parse_opts(options, clnt); 958 if (err < 0) 959 goto free_client; 960 961 if (!clnt->trans_mod) 962 clnt->trans_mod = v9fs_get_default_trans(); 963 964 if (clnt->trans_mod == NULL) { 965 err = -EPROTONOSUPPORT; 966 p9_debug(P9_DEBUG_ERROR, 967 "No transport defined or default transport\n"); 968 goto free_client; 969 } 970 971 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 972 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 973 974 err = clnt->trans_mod->create(clnt, dev_name, options); 975 if (err) 976 goto put_trans; 977 978 if (clnt->msize > clnt->trans_mod->maxsize) 979 clnt->msize = clnt->trans_mod->maxsize; 980 981 err = p9_client_version(clnt); 982 if (err) 983 goto close_trans; 984 985 return clnt; 986 987 close_trans: 988 clnt->trans_mod->close(clnt); 989 put_trans: 990 v9fs_put_trans(clnt->trans_mod); 991 free_client: 992 kfree(clnt); 993 return ERR_PTR(err); 994 } 995 EXPORT_SYMBOL(p9_client_create); 996 997 void p9_client_destroy(struct p9_client *clnt) 998 { 999 struct p9_fid *fid; 1000 int id; 1001 1002 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1003 1004 if (clnt->trans_mod) 1005 clnt->trans_mod->close(clnt); 1006 1007 v9fs_put_trans(clnt->trans_mod); 1008 1009 idr_for_each_entry(&clnt->fids, fid, id) { 1010 pr_info("Found fid %d not clunked\n", fid->fid); 1011 p9_fid_destroy(fid); 1012 } 1013 1014 p9_tag_cleanup(clnt); 1015 1016 kfree(clnt); 1017 } 1018 EXPORT_SYMBOL(p9_client_destroy); 1019 1020 void p9_client_disconnect(struct p9_client *clnt) 1021 { 1022 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1023 clnt->status = Disconnected; 1024 } 1025 EXPORT_SYMBOL(p9_client_disconnect); 1026 1027 void p9_client_begin_disconnect(struct p9_client *clnt) 1028 { 1029 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1030 clnt->status = BeginDisconnect; 1031 } 1032 EXPORT_SYMBOL(p9_client_begin_disconnect); 1033 1034 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1035 const char *uname, kuid_t n_uname, const char *aname) 1036 { 1037 int err = 0; 1038 struct p9_req_t *req; 1039 struct p9_fid *fid; 1040 struct p9_qid qid; 1041 1042 1043 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1044 afid ? afid->fid : -1, uname, aname); 1045 fid = p9_fid_create(clnt); 1046 if (!fid) { 1047 err = -ENOMEM; 1048 goto error; 1049 } 1050 fid->uid = n_uname; 1051 1052 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1053 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1054 if (IS_ERR(req)) { 1055 err = PTR_ERR(req); 1056 goto error; 1057 } 1058 1059 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid); 1060 if (err) { 1061 trace_9p_protocol_dump(clnt, req->rc); 1062 p9_free_req(clnt, req); 1063 goto error; 1064 } 1065 1066 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1067 qid.type, (unsigned long long)qid.path, qid.version); 1068 1069 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1070 1071 p9_free_req(clnt, req); 1072 return fid; 1073 1074 error: 1075 if (fid) 1076 p9_fid_destroy(fid); 1077 return ERR_PTR(err); 1078 } 1079 EXPORT_SYMBOL(p9_client_attach); 1080 1081 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1082 const unsigned char * const *wnames, int clone) 1083 { 1084 int err; 1085 struct p9_client *clnt; 1086 struct p9_fid *fid; 1087 struct p9_qid *wqids; 1088 struct p9_req_t *req; 1089 uint16_t nwqids, count; 1090 1091 err = 0; 1092 wqids = NULL; 1093 clnt = oldfid->clnt; 1094 if (clone) { 1095 fid = p9_fid_create(clnt); 1096 if (!fid) { 1097 err = -ENOMEM; 1098 goto error; 1099 } 1100 1101 fid->uid = oldfid->uid; 1102 } else 1103 fid = oldfid; 1104 1105 1106 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1107 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1108 1109 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1110 nwname, wnames); 1111 if (IS_ERR(req)) { 1112 err = PTR_ERR(req); 1113 goto error; 1114 } 1115 1116 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1117 if (err) { 1118 trace_9p_protocol_dump(clnt, req->rc); 1119 p9_free_req(clnt, req); 1120 goto clunk_fid; 1121 } 1122 p9_free_req(clnt, req); 1123 1124 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1125 1126 if (nwqids != nwname) { 1127 err = -ENOENT; 1128 goto clunk_fid; 1129 } 1130 1131 for (count = 0; count < nwqids; count++) 1132 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1133 count, wqids[count].type, 1134 (unsigned long long)wqids[count].path, 1135 wqids[count].version); 1136 1137 if (nwname) 1138 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1139 else 1140 fid->qid = oldfid->qid; 1141 1142 kfree(wqids); 1143 return fid; 1144 1145 clunk_fid: 1146 kfree(wqids); 1147 p9_client_clunk(fid); 1148 fid = NULL; 1149 1150 error: 1151 if (fid && (fid != oldfid)) 1152 p9_fid_destroy(fid); 1153 1154 return ERR_PTR(err); 1155 } 1156 EXPORT_SYMBOL(p9_client_walk); 1157 1158 int p9_client_open(struct p9_fid *fid, int mode) 1159 { 1160 int err; 1161 struct p9_client *clnt; 1162 struct p9_req_t *req; 1163 struct p9_qid qid; 1164 int iounit; 1165 1166 clnt = fid->clnt; 1167 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1168 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1169 err = 0; 1170 1171 if (fid->mode != -1) 1172 return -EINVAL; 1173 1174 if (p9_is_proto_dotl(clnt)) 1175 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1176 else 1177 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1178 if (IS_ERR(req)) { 1179 err = PTR_ERR(req); 1180 goto error; 1181 } 1182 1183 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1184 if (err) { 1185 trace_9p_protocol_dump(clnt, req->rc); 1186 goto free_and_error; 1187 } 1188 1189 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1190 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1191 (unsigned long long)qid.path, qid.version, iounit); 1192 1193 fid->mode = mode; 1194 fid->iounit = iounit; 1195 1196 free_and_error: 1197 p9_free_req(clnt, req); 1198 error: 1199 return err; 1200 } 1201 EXPORT_SYMBOL(p9_client_open); 1202 1203 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode, 1204 kgid_t gid, struct p9_qid *qid) 1205 { 1206 int err = 0; 1207 struct p9_client *clnt; 1208 struct p9_req_t *req; 1209 int iounit; 1210 1211 p9_debug(P9_DEBUG_9P, 1212 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1213 ofid->fid, name, flags, mode, 1214 from_kgid(&init_user_ns, gid)); 1215 clnt = ofid->clnt; 1216 1217 if (ofid->mode != -1) 1218 return -EINVAL; 1219 1220 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1221 mode, gid); 1222 if (IS_ERR(req)) { 1223 err = PTR_ERR(req); 1224 goto error; 1225 } 1226 1227 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit); 1228 if (err) { 1229 trace_9p_protocol_dump(clnt, req->rc); 1230 goto free_and_error; 1231 } 1232 1233 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1234 qid->type, 1235 (unsigned long long)qid->path, 1236 qid->version, iounit); 1237 1238 ofid->mode = mode; 1239 ofid->iounit = iounit; 1240 1241 free_and_error: 1242 p9_free_req(clnt, req); 1243 error: 1244 return err; 1245 } 1246 EXPORT_SYMBOL(p9_client_create_dotl); 1247 1248 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1249 char *extension) 1250 { 1251 int err; 1252 struct p9_client *clnt; 1253 struct p9_req_t *req; 1254 struct p9_qid qid; 1255 int iounit; 1256 1257 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1258 fid->fid, name, perm, mode); 1259 err = 0; 1260 clnt = fid->clnt; 1261 1262 if (fid->mode != -1) 1263 return -EINVAL; 1264 1265 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1266 mode, extension); 1267 if (IS_ERR(req)) { 1268 err = PTR_ERR(req); 1269 goto error; 1270 } 1271 1272 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1273 if (err) { 1274 trace_9p_protocol_dump(clnt, req->rc); 1275 goto free_and_error; 1276 } 1277 1278 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1279 qid.type, 1280 (unsigned long long)qid.path, 1281 qid.version, iounit); 1282 1283 fid->mode = mode; 1284 fid->iounit = iounit; 1285 1286 free_and_error: 1287 p9_free_req(clnt, req); 1288 error: 1289 return err; 1290 } 1291 EXPORT_SYMBOL(p9_client_fcreate); 1292 1293 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1294 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1295 { 1296 int err = 0; 1297 struct p9_client *clnt; 1298 struct p9_req_t *req; 1299 1300 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1301 dfid->fid, name, symtgt); 1302 clnt = dfid->clnt; 1303 1304 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1305 gid); 1306 if (IS_ERR(req)) { 1307 err = PTR_ERR(req); 1308 goto error; 1309 } 1310 1311 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1312 if (err) { 1313 trace_9p_protocol_dump(clnt, req->rc); 1314 goto free_and_error; 1315 } 1316 1317 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1318 qid->type, (unsigned long long)qid->path, qid->version); 1319 1320 free_and_error: 1321 p9_free_req(clnt, req); 1322 error: 1323 return err; 1324 } 1325 EXPORT_SYMBOL(p9_client_symlink); 1326 1327 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1328 { 1329 struct p9_client *clnt; 1330 struct p9_req_t *req; 1331 1332 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1333 dfid->fid, oldfid->fid, newname); 1334 clnt = dfid->clnt; 1335 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1336 newname); 1337 if (IS_ERR(req)) 1338 return PTR_ERR(req); 1339 1340 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1341 p9_free_req(clnt, req); 1342 return 0; 1343 } 1344 EXPORT_SYMBOL(p9_client_link); 1345 1346 int p9_client_fsync(struct p9_fid *fid, int datasync) 1347 { 1348 int err; 1349 struct p9_client *clnt; 1350 struct p9_req_t *req; 1351 1352 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1353 fid->fid, datasync); 1354 err = 0; 1355 clnt = fid->clnt; 1356 1357 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1358 if (IS_ERR(req)) { 1359 err = PTR_ERR(req); 1360 goto error; 1361 } 1362 1363 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1364 1365 p9_free_req(clnt, req); 1366 1367 error: 1368 return err; 1369 } 1370 EXPORT_SYMBOL(p9_client_fsync); 1371 1372 int p9_client_clunk(struct p9_fid *fid) 1373 { 1374 int err; 1375 struct p9_client *clnt; 1376 struct p9_req_t *req; 1377 int retries = 0; 1378 1379 if (!fid) { 1380 pr_warn("%s (%d): Trying to clunk with NULL fid\n", 1381 __func__, task_pid_nr(current)); 1382 dump_stack(); 1383 return 0; 1384 } 1385 1386 again: 1387 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid, 1388 retries); 1389 err = 0; 1390 clnt = fid->clnt; 1391 1392 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1393 if (IS_ERR(req)) { 1394 err = PTR_ERR(req); 1395 goto error; 1396 } 1397 1398 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1399 1400 p9_free_req(clnt, req); 1401 error: 1402 /* 1403 * Fid is not valid even after a failed clunk 1404 * If interrupted, retry once then give up and 1405 * leak fid until umount. 1406 */ 1407 if (err == -ERESTARTSYS) { 1408 if (retries++ == 0) 1409 goto again; 1410 } else 1411 p9_fid_destroy(fid); 1412 return err; 1413 } 1414 EXPORT_SYMBOL(p9_client_clunk); 1415 1416 int p9_client_remove(struct p9_fid *fid) 1417 { 1418 int err; 1419 struct p9_client *clnt; 1420 struct p9_req_t *req; 1421 1422 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1423 err = 0; 1424 clnt = fid->clnt; 1425 1426 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1427 if (IS_ERR(req)) { 1428 err = PTR_ERR(req); 1429 goto error; 1430 } 1431 1432 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1433 1434 p9_free_req(clnt, req); 1435 error: 1436 if (err == -ERESTARTSYS) 1437 p9_client_clunk(fid); 1438 else 1439 p9_fid_destroy(fid); 1440 return err; 1441 } 1442 EXPORT_SYMBOL(p9_client_remove); 1443 1444 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1445 { 1446 int err = 0; 1447 struct p9_req_t *req; 1448 struct p9_client *clnt; 1449 1450 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1451 dfid->fid, name, flags); 1452 1453 clnt = dfid->clnt; 1454 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1455 if (IS_ERR(req)) { 1456 err = PTR_ERR(req); 1457 goto error; 1458 } 1459 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1460 1461 p9_free_req(clnt, req); 1462 error: 1463 return err; 1464 } 1465 EXPORT_SYMBOL(p9_client_unlinkat); 1466 1467 int 1468 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1469 { 1470 struct p9_client *clnt = fid->clnt; 1471 struct p9_req_t *req; 1472 int total = 0; 1473 *err = 0; 1474 1475 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", 1476 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to)); 1477 1478 while (iov_iter_count(to)) { 1479 int count = iov_iter_count(to); 1480 int rsize, non_zc = 0; 1481 char *dataptr; 1482 1483 rsize = fid->iounit; 1484 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1485 rsize = clnt->msize - P9_IOHDRSZ; 1486 1487 if (count < rsize) 1488 rsize = count; 1489 1490 /* Don't bother zerocopy for small IO (< 1024) */ 1491 if (clnt->trans_mod->zc_request && rsize > 1024) { 1492 /* 1493 * response header len is 11 1494 * PDU Header(7) + IO Size (4) 1495 */ 1496 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1497 0, 11, "dqd", fid->fid, 1498 offset, rsize); 1499 } else { 1500 non_zc = 1; 1501 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1502 rsize); 1503 } 1504 if (IS_ERR(req)) { 1505 *err = PTR_ERR(req); 1506 break; 1507 } 1508 1509 *err = p9pdu_readf(req->rc, clnt->proto_version, 1510 "D", &count, &dataptr); 1511 if (*err) { 1512 trace_9p_protocol_dump(clnt, req->rc); 1513 p9_free_req(clnt, req); 1514 break; 1515 } 1516 if (rsize < count) { 1517 pr_err("bogus RREAD count (%d > %d)\n", count, rsize); 1518 count = rsize; 1519 } 1520 1521 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1522 if (!count) { 1523 p9_free_req(clnt, req); 1524 break; 1525 } 1526 1527 if (non_zc) { 1528 int n = copy_to_iter(dataptr, count, to); 1529 total += n; 1530 offset += n; 1531 if (n != count) { 1532 *err = -EFAULT; 1533 p9_free_req(clnt, req); 1534 break; 1535 } 1536 } else { 1537 iov_iter_advance(to, count); 1538 total += count; 1539 offset += count; 1540 } 1541 p9_free_req(clnt, req); 1542 } 1543 return total; 1544 } 1545 EXPORT_SYMBOL(p9_client_read); 1546 1547 int 1548 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1549 { 1550 struct p9_client *clnt = fid->clnt; 1551 struct p9_req_t *req; 1552 int total = 0; 1553 *err = 0; 1554 1555 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", 1556 fid->fid, (unsigned long long) offset, 1557 iov_iter_count(from)); 1558 1559 while (iov_iter_count(from)) { 1560 int count = iov_iter_count(from); 1561 int rsize = fid->iounit; 1562 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1563 rsize = clnt->msize - P9_IOHDRSZ; 1564 1565 if (count < rsize) 1566 rsize = count; 1567 1568 /* Don't bother zerocopy for small IO (< 1024) */ 1569 if (clnt->trans_mod->zc_request && rsize > 1024) { 1570 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1571 rsize, P9_ZC_HDR_SZ, "dqd", 1572 fid->fid, offset, rsize); 1573 } else { 1574 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1575 offset, rsize, from); 1576 } 1577 if (IS_ERR(req)) { 1578 *err = PTR_ERR(req); 1579 break; 1580 } 1581 1582 *err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count); 1583 if (*err) { 1584 trace_9p_protocol_dump(clnt, req->rc); 1585 p9_free_req(clnt, req); 1586 break; 1587 } 1588 if (rsize < count) { 1589 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize); 1590 count = rsize; 1591 } 1592 1593 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1594 1595 p9_free_req(clnt, req); 1596 iov_iter_advance(from, count); 1597 total += count; 1598 offset += count; 1599 } 1600 return total; 1601 } 1602 EXPORT_SYMBOL(p9_client_write); 1603 1604 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1605 { 1606 int err; 1607 struct p9_client *clnt; 1608 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1609 struct p9_req_t *req; 1610 u16 ignored; 1611 1612 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1613 1614 if (!ret) 1615 return ERR_PTR(-ENOMEM); 1616 1617 err = 0; 1618 clnt = fid->clnt; 1619 1620 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1621 if (IS_ERR(req)) { 1622 err = PTR_ERR(req); 1623 goto error; 1624 } 1625 1626 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret); 1627 if (err) { 1628 trace_9p_protocol_dump(clnt, req->rc); 1629 p9_free_req(clnt, req); 1630 goto error; 1631 } 1632 1633 p9_debug(P9_DEBUG_9P, 1634 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1635 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1636 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1637 "<<< uid=%d gid=%d n_muid=%d\n", 1638 ret->size, ret->type, ret->dev, ret->qid.type, 1639 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1640 ret->atime, ret->mtime, (unsigned long long)ret->length, 1641 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1642 from_kuid(&init_user_ns, ret->n_uid), 1643 from_kgid(&init_user_ns, ret->n_gid), 1644 from_kuid(&init_user_ns, ret->n_muid)); 1645 1646 p9_free_req(clnt, req); 1647 return ret; 1648 1649 error: 1650 kfree(ret); 1651 return ERR_PTR(err); 1652 } 1653 EXPORT_SYMBOL(p9_client_stat); 1654 1655 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1656 u64 request_mask) 1657 { 1658 int err; 1659 struct p9_client *clnt; 1660 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1661 GFP_KERNEL); 1662 struct p9_req_t *req; 1663 1664 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1665 fid->fid, request_mask); 1666 1667 if (!ret) 1668 return ERR_PTR(-ENOMEM); 1669 1670 err = 0; 1671 clnt = fid->clnt; 1672 1673 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1674 if (IS_ERR(req)) { 1675 err = PTR_ERR(req); 1676 goto error; 1677 } 1678 1679 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret); 1680 if (err) { 1681 trace_9p_protocol_dump(clnt, req->rc); 1682 p9_free_req(clnt, req); 1683 goto error; 1684 } 1685 1686 p9_debug(P9_DEBUG_9P, 1687 "<<< RGETATTR st_result_mask=%lld\n" 1688 "<<< qid=%x.%llx.%x\n" 1689 "<<< st_mode=%8.8x st_nlink=%llu\n" 1690 "<<< st_uid=%d st_gid=%d\n" 1691 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1692 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1693 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1694 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1695 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1696 "<<< st_gen=%lld st_data_version=%lld\n", 1697 ret->st_result_mask, ret->qid.type, ret->qid.path, 1698 ret->qid.version, ret->st_mode, ret->st_nlink, 1699 from_kuid(&init_user_ns, ret->st_uid), 1700 from_kgid(&init_user_ns, ret->st_gid), 1701 ret->st_rdev, ret->st_size, ret->st_blksize, 1702 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1703 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1704 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1705 ret->st_gen, ret->st_data_version); 1706 1707 p9_free_req(clnt, req); 1708 return ret; 1709 1710 error: 1711 kfree(ret); 1712 return ERR_PTR(err); 1713 } 1714 EXPORT_SYMBOL(p9_client_getattr_dotl); 1715 1716 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1717 { 1718 int ret; 1719 1720 /* NOTE: size shouldn't include its own length */ 1721 /* size[2] type[2] dev[4] qid[13] */ 1722 /* mode[4] atime[4] mtime[4] length[8]*/ 1723 /* name[s] uid[s] gid[s] muid[s] */ 1724 ret = 2+4+13+4+4+4+8+2+2+2+2; 1725 1726 if (wst->name) 1727 ret += strlen(wst->name); 1728 if (wst->uid) 1729 ret += strlen(wst->uid); 1730 if (wst->gid) 1731 ret += strlen(wst->gid); 1732 if (wst->muid) 1733 ret += strlen(wst->muid); 1734 1735 if ((proto_version == p9_proto_2000u) || 1736 (proto_version == p9_proto_2000L)) { 1737 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1738 if (wst->extension) 1739 ret += strlen(wst->extension); 1740 } 1741 1742 return ret; 1743 } 1744 1745 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1746 { 1747 int err; 1748 struct p9_req_t *req; 1749 struct p9_client *clnt; 1750 1751 err = 0; 1752 clnt = fid->clnt; 1753 wst->size = p9_client_statsize(wst, clnt->proto_version); 1754 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1755 p9_debug(P9_DEBUG_9P, 1756 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1757 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1758 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1759 " uid=%d gid=%d n_muid=%d\n", 1760 wst->size, wst->type, wst->dev, wst->qid.type, 1761 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1762 wst->atime, wst->mtime, (unsigned long long)wst->length, 1763 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1764 from_kuid(&init_user_ns, wst->n_uid), 1765 from_kgid(&init_user_ns, wst->n_gid), 1766 from_kuid(&init_user_ns, wst->n_muid)); 1767 1768 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1769 if (IS_ERR(req)) { 1770 err = PTR_ERR(req); 1771 goto error; 1772 } 1773 1774 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1775 1776 p9_free_req(clnt, req); 1777 error: 1778 return err; 1779 } 1780 EXPORT_SYMBOL(p9_client_wstat); 1781 1782 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1783 { 1784 int err; 1785 struct p9_req_t *req; 1786 struct p9_client *clnt; 1787 1788 err = 0; 1789 clnt = fid->clnt; 1790 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1791 p9_debug(P9_DEBUG_9P, 1792 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1793 " atime_sec=%lld atime_nsec=%lld\n" 1794 " mtime_sec=%lld mtime_nsec=%lld\n", 1795 p9attr->valid, p9attr->mode, 1796 from_kuid(&init_user_ns, p9attr->uid), 1797 from_kgid(&init_user_ns, p9attr->gid), 1798 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1799 p9attr->mtime_sec, p9attr->mtime_nsec); 1800 1801 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1802 1803 if (IS_ERR(req)) { 1804 err = PTR_ERR(req); 1805 goto error; 1806 } 1807 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1808 p9_free_req(clnt, req); 1809 error: 1810 return err; 1811 } 1812 EXPORT_SYMBOL(p9_client_setattr); 1813 1814 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1815 { 1816 int err; 1817 struct p9_req_t *req; 1818 struct p9_client *clnt; 1819 1820 err = 0; 1821 clnt = fid->clnt; 1822 1823 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1824 1825 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1826 if (IS_ERR(req)) { 1827 err = PTR_ERR(req); 1828 goto error; 1829 } 1830 1831 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1832 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1833 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1834 if (err) { 1835 trace_9p_protocol_dump(clnt, req->rc); 1836 p9_free_req(clnt, req); 1837 goto error; 1838 } 1839 1840 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1841 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1842 "fsid %llu namelen %ld\n", 1843 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1844 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1845 sb->fsid, (long int)sb->namelen); 1846 1847 p9_free_req(clnt, req); 1848 error: 1849 return err; 1850 } 1851 EXPORT_SYMBOL(p9_client_statfs); 1852 1853 int p9_client_rename(struct p9_fid *fid, 1854 struct p9_fid *newdirfid, const char *name) 1855 { 1856 int err; 1857 struct p9_req_t *req; 1858 struct p9_client *clnt; 1859 1860 err = 0; 1861 clnt = fid->clnt; 1862 1863 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1864 fid->fid, newdirfid->fid, name); 1865 1866 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1867 newdirfid->fid, name); 1868 if (IS_ERR(req)) { 1869 err = PTR_ERR(req); 1870 goto error; 1871 } 1872 1873 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1874 1875 p9_free_req(clnt, req); 1876 error: 1877 return err; 1878 } 1879 EXPORT_SYMBOL(p9_client_rename); 1880 1881 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1882 struct p9_fid *newdirfid, const char *new_name) 1883 { 1884 int err; 1885 struct p9_req_t *req; 1886 struct p9_client *clnt; 1887 1888 err = 0; 1889 clnt = olddirfid->clnt; 1890 1891 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" 1892 " newdirfid %d new name %s\n", olddirfid->fid, old_name, 1893 newdirfid->fid, new_name); 1894 1895 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1896 old_name, newdirfid->fid, new_name); 1897 if (IS_ERR(req)) { 1898 err = PTR_ERR(req); 1899 goto error; 1900 } 1901 1902 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1903 newdirfid->fid, new_name); 1904 1905 p9_free_req(clnt, req); 1906 error: 1907 return err; 1908 } 1909 EXPORT_SYMBOL(p9_client_renameat); 1910 1911 /* 1912 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1913 */ 1914 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1915 const char *attr_name, u64 *attr_size) 1916 { 1917 int err; 1918 struct p9_req_t *req; 1919 struct p9_client *clnt; 1920 struct p9_fid *attr_fid; 1921 1922 err = 0; 1923 clnt = file_fid->clnt; 1924 attr_fid = p9_fid_create(clnt); 1925 if (!attr_fid) { 1926 err = -ENOMEM; 1927 goto error; 1928 } 1929 p9_debug(P9_DEBUG_9P, 1930 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 1931 file_fid->fid, attr_fid->fid, attr_name); 1932 1933 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 1934 file_fid->fid, attr_fid->fid, attr_name); 1935 if (IS_ERR(req)) { 1936 err = PTR_ERR(req); 1937 goto error; 1938 } 1939 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size); 1940 if (err) { 1941 trace_9p_protocol_dump(clnt, req->rc); 1942 p9_free_req(clnt, req); 1943 goto clunk_fid; 1944 } 1945 p9_free_req(clnt, req); 1946 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 1947 attr_fid->fid, *attr_size); 1948 return attr_fid; 1949 clunk_fid: 1950 p9_client_clunk(attr_fid); 1951 attr_fid = NULL; 1952 error: 1953 if (attr_fid && (attr_fid != file_fid)) 1954 p9_fid_destroy(attr_fid); 1955 1956 return ERR_PTR(err); 1957 } 1958 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 1959 1960 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 1961 u64 attr_size, int flags) 1962 { 1963 int err; 1964 struct p9_req_t *req; 1965 struct p9_client *clnt; 1966 1967 p9_debug(P9_DEBUG_9P, 1968 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 1969 fid->fid, name, (long long)attr_size, flags); 1970 err = 0; 1971 clnt = fid->clnt; 1972 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 1973 fid->fid, name, attr_size, flags); 1974 if (IS_ERR(req)) { 1975 err = PTR_ERR(req); 1976 goto error; 1977 } 1978 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 1979 p9_free_req(clnt, req); 1980 error: 1981 return err; 1982 } 1983 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 1984 1985 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 1986 { 1987 int err, rsize, non_zc = 0; 1988 struct p9_client *clnt; 1989 struct p9_req_t *req; 1990 char *dataptr; 1991 struct kvec kv = {.iov_base = data, .iov_len = count}; 1992 struct iov_iter to; 1993 1994 iov_iter_kvec(&to, READ | ITER_KVEC, &kv, 1, count); 1995 1996 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 1997 fid->fid, (unsigned long long) offset, count); 1998 1999 err = 0; 2000 clnt = fid->clnt; 2001 2002 rsize = fid->iounit; 2003 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 2004 rsize = clnt->msize - P9_READDIRHDRSZ; 2005 2006 if (count < rsize) 2007 rsize = count; 2008 2009 /* Don't bother zerocopy for small IO (< 1024) */ 2010 if (clnt->trans_mod->zc_request && rsize > 1024) { 2011 /* 2012 * response header len is 11 2013 * PDU Header(7) + IO Size (4) 2014 */ 2015 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2016 11, "dqd", fid->fid, offset, rsize); 2017 } else { 2018 non_zc = 1; 2019 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2020 offset, rsize); 2021 } 2022 if (IS_ERR(req)) { 2023 err = PTR_ERR(req); 2024 goto error; 2025 } 2026 2027 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 2028 if (err) { 2029 trace_9p_protocol_dump(clnt, req->rc); 2030 goto free_and_error; 2031 } 2032 if (rsize < count) { 2033 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2034 count = rsize; 2035 } 2036 2037 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2038 2039 if (non_zc) 2040 memmove(data, dataptr, count); 2041 2042 p9_free_req(clnt, req); 2043 return count; 2044 2045 free_and_error: 2046 p9_free_req(clnt, req); 2047 error: 2048 return err; 2049 } 2050 EXPORT_SYMBOL(p9_client_readdir); 2051 2052 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2053 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2054 { 2055 int err; 2056 struct p9_client *clnt; 2057 struct p9_req_t *req; 2058 2059 err = 0; 2060 clnt = fid->clnt; 2061 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 2062 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2063 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2064 MAJOR(rdev), MINOR(rdev), gid); 2065 if (IS_ERR(req)) 2066 return PTR_ERR(req); 2067 2068 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 2069 if (err) { 2070 trace_9p_protocol_dump(clnt, req->rc); 2071 goto error; 2072 } 2073 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 2074 (unsigned long long)qid->path, qid->version); 2075 2076 error: 2077 p9_free_req(clnt, req); 2078 return err; 2079 2080 } 2081 EXPORT_SYMBOL(p9_client_mknod_dotl); 2082 2083 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2084 kgid_t gid, struct p9_qid *qid) 2085 { 2086 int err; 2087 struct p9_client *clnt; 2088 struct p9_req_t *req; 2089 2090 err = 0; 2091 clnt = fid->clnt; 2092 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2093 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2094 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode, 2095 gid); 2096 if (IS_ERR(req)) 2097 return PTR_ERR(req); 2098 2099 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 2100 if (err) { 2101 trace_9p_protocol_dump(clnt, req->rc); 2102 goto error; 2103 } 2104 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2105 (unsigned long long)qid->path, qid->version); 2106 2107 error: 2108 p9_free_req(clnt, req); 2109 return err; 2110 2111 } 2112 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2113 2114 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2115 { 2116 int err; 2117 struct p9_client *clnt; 2118 struct p9_req_t *req; 2119 2120 err = 0; 2121 clnt = fid->clnt; 2122 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " 2123 "start %lld length %lld proc_id %d client_id %s\n", 2124 fid->fid, flock->type, flock->flags, flock->start, 2125 flock->length, flock->proc_id, flock->client_id); 2126 2127 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2128 flock->flags, flock->start, flock->length, 2129 flock->proc_id, flock->client_id); 2130 2131 if (IS_ERR(req)) 2132 return PTR_ERR(req); 2133 2134 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status); 2135 if (err) { 2136 trace_9p_protocol_dump(clnt, req->rc); 2137 goto error; 2138 } 2139 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2140 error: 2141 p9_free_req(clnt, req); 2142 return err; 2143 2144 } 2145 EXPORT_SYMBOL(p9_client_lock_dotl); 2146 2147 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2148 { 2149 int err; 2150 struct p9_client *clnt; 2151 struct p9_req_t *req; 2152 2153 err = 0; 2154 clnt = fid->clnt; 2155 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " 2156 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, 2157 glock->start, glock->length, glock->proc_id, glock->client_id); 2158 2159 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, 2160 glock->start, glock->length, glock->proc_id, glock->client_id); 2161 2162 if (IS_ERR(req)) 2163 return PTR_ERR(req); 2164 2165 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type, 2166 &glock->start, &glock->length, &glock->proc_id, 2167 &glock->client_id); 2168 if (err) { 2169 trace_9p_protocol_dump(clnt, req->rc); 2170 goto error; 2171 } 2172 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " 2173 "proc_id %d client_id %s\n", glock->type, glock->start, 2174 glock->length, glock->proc_id, glock->client_id); 2175 error: 2176 p9_free_req(clnt, req); 2177 return err; 2178 } 2179 EXPORT_SYMBOL(p9_client_getlock_dotl); 2180 2181 int p9_client_readlink(struct p9_fid *fid, char **target) 2182 { 2183 int err; 2184 struct p9_client *clnt; 2185 struct p9_req_t *req; 2186 2187 err = 0; 2188 clnt = fid->clnt; 2189 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2190 2191 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2192 if (IS_ERR(req)) 2193 return PTR_ERR(req); 2194 2195 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target); 2196 if (err) { 2197 trace_9p_protocol_dump(clnt, req->rc); 2198 goto error; 2199 } 2200 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2201 error: 2202 p9_free_req(clnt, req); 2203 return err; 2204 } 2205 EXPORT_SYMBOL(p9_client_readlink); 2206 2207 int __init p9_client_init(void) 2208 { 2209 p9_req_cache = KMEM_CACHE(p9_req_t, 0); 2210 return p9_req_cache ? 0 : -ENOMEM; 2211 } 2212 2213 void __exit p9_client_exit(void) 2214 { 2215 kmem_cache_destroy(p9_req_cache); 2216 } 2217