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 kfree(s); 202 goto free_and_return; 203 } 204 kfree(s); 205 break; 206 case Opt_legacy: 207 clnt->proto_version = p9_proto_legacy; 208 break; 209 case Opt_version: 210 s = match_strdup(&args[0]); 211 if (!s) { 212 ret = -ENOMEM; 213 p9_debug(P9_DEBUG_ERROR, 214 "problem allocating copy of version arg\n"); 215 goto free_and_return; 216 } 217 ret = get_protocol_version(s); 218 if (ret == -EINVAL) { 219 kfree(s); 220 goto free_and_return; 221 } 222 kfree(s); 223 clnt->proto_version = ret; 224 break; 225 default: 226 continue; 227 } 228 } 229 230 free_and_return: 231 v9fs_put_trans(clnt->trans_mod); 232 kfree(tmp_options); 233 return ret; 234 } 235 236 static struct p9_fcall *p9_fcall_alloc(int alloc_msize) 237 { 238 struct p9_fcall *fc; 239 fc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, GFP_NOFS); 240 if (!fc) 241 return NULL; 242 fc->capacity = alloc_msize; 243 fc->sdata = (char *) fc + sizeof(struct p9_fcall); 244 return fc; 245 } 246 247 /** 248 * p9_tag_alloc - lookup/allocate a request by tag 249 * @c: client session to lookup tag within 250 * @tag: numeric id for transaction 251 * 252 * this is a simple array lookup, but will grow the 253 * request_slots as necessary to accommodate transaction 254 * ids which did not previously have a slot. 255 * 256 * this code relies on the client spinlock to manage locks, its 257 * possible we should switch to something else, but I'd rather 258 * stick with something low-overhead for the common case. 259 * 260 */ 261 262 static struct p9_req_t * 263 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size) 264 { 265 unsigned long flags; 266 int row, col; 267 struct p9_req_t *req; 268 int alloc_msize = min(c->msize, max_size); 269 270 /* This looks up the original request by tag so we know which 271 * buffer to read the data into */ 272 tag++; 273 274 if (tag >= c->max_tag) { 275 spin_lock_irqsave(&c->lock, flags); 276 /* check again since original check was outside of lock */ 277 while (tag >= c->max_tag) { 278 row = (tag / P9_ROW_MAXTAG); 279 c->reqs[row] = kcalloc(P9_ROW_MAXTAG, 280 sizeof(struct p9_req_t), GFP_ATOMIC); 281 282 if (!c->reqs[row]) { 283 pr_err("Couldn't grow tag array\n"); 284 spin_unlock_irqrestore(&c->lock, flags); 285 return ERR_PTR(-ENOMEM); 286 } 287 for (col = 0; col < P9_ROW_MAXTAG; col++) { 288 c->reqs[row][col].status = REQ_STATUS_IDLE; 289 c->reqs[row][col].tc = NULL; 290 } 291 c->max_tag += P9_ROW_MAXTAG; 292 } 293 spin_unlock_irqrestore(&c->lock, flags); 294 } 295 row = tag / P9_ROW_MAXTAG; 296 col = tag % P9_ROW_MAXTAG; 297 298 req = &c->reqs[row][col]; 299 if (!req->wq) { 300 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS); 301 if (!req->wq) 302 goto grow_failed; 303 init_waitqueue_head(req->wq); 304 } 305 306 if (!req->tc) 307 req->tc = p9_fcall_alloc(alloc_msize); 308 if (!req->rc) 309 req->rc = p9_fcall_alloc(alloc_msize); 310 if (!req->tc || !req->rc) 311 goto grow_failed; 312 313 p9pdu_reset(req->tc); 314 p9pdu_reset(req->rc); 315 316 req->tc->tag = tag-1; 317 req->status = REQ_STATUS_ALLOC; 318 319 return req; 320 321 grow_failed: 322 pr_err("Couldn't grow tag array\n"); 323 kfree(req->tc); 324 kfree(req->rc); 325 kfree(req->wq); 326 req->tc = req->rc = NULL; 327 req->wq = NULL; 328 return ERR_PTR(-ENOMEM); 329 } 330 331 /** 332 * p9_tag_lookup - lookup a request by tag 333 * @c: client session to lookup tag within 334 * @tag: numeric id for transaction 335 * 336 */ 337 338 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 339 { 340 int row, col; 341 342 /* This looks up the original request by tag so we know which 343 * buffer to read the data into */ 344 tag++; 345 346 if(tag >= c->max_tag) 347 return NULL; 348 349 row = tag / P9_ROW_MAXTAG; 350 col = tag % P9_ROW_MAXTAG; 351 352 return &c->reqs[row][col]; 353 } 354 EXPORT_SYMBOL(p9_tag_lookup); 355 356 /** 357 * p9_tag_init - setup tags structure and contents 358 * @c: v9fs client struct 359 * 360 * This initializes the tags structure for each client instance. 361 * 362 */ 363 364 static int p9_tag_init(struct p9_client *c) 365 { 366 int err = 0; 367 368 c->tagpool = p9_idpool_create(); 369 if (IS_ERR(c->tagpool)) { 370 err = PTR_ERR(c->tagpool); 371 goto error; 372 } 373 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */ 374 if (err < 0) { 375 p9_idpool_destroy(c->tagpool); 376 goto error; 377 } 378 c->max_tag = 0; 379 error: 380 return err; 381 } 382 383 /** 384 * p9_tag_cleanup - cleans up tags structure and reclaims resources 385 * @c: v9fs client struct 386 * 387 * This frees resources associated with the tags structure 388 * 389 */ 390 static void p9_tag_cleanup(struct p9_client *c) 391 { 392 int row, col; 393 394 /* check to insure all requests are idle */ 395 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 396 for (col = 0; col < P9_ROW_MAXTAG; col++) { 397 if (c->reqs[row][col].status != REQ_STATUS_IDLE) { 398 p9_debug(P9_DEBUG_MUX, 399 "Attempting to cleanup non-free tag %d,%d\n", 400 row, col); 401 /* TODO: delay execution of cleanup */ 402 return; 403 } 404 } 405 } 406 407 if (c->tagpool) { 408 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */ 409 p9_idpool_destroy(c->tagpool); 410 } 411 412 /* free requests associated with tags */ 413 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 414 for (col = 0; col < P9_ROW_MAXTAG; col++) { 415 kfree(c->reqs[row][col].wq); 416 kfree(c->reqs[row][col].tc); 417 kfree(c->reqs[row][col].rc); 418 } 419 kfree(c->reqs[row]); 420 } 421 c->max_tag = 0; 422 } 423 424 /** 425 * p9_free_req - free a request and clean-up as necessary 426 * c: client state 427 * r: request to release 428 * 429 */ 430 431 static void p9_free_req(struct p9_client *c, struct p9_req_t *r) 432 { 433 int tag = r->tc->tag; 434 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); 435 436 r->status = REQ_STATUS_IDLE; 437 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool)) 438 p9_idpool_put(tag, c->tagpool); 439 } 440 441 /** 442 * p9_client_cb - call back from transport to client 443 * c: client state 444 * req: request received 445 * 446 */ 447 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) 448 { 449 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag); 450 451 /* 452 * This barrier is needed to make sure any change made to req before 453 * the other thread wakes up will indeed be seen by the waiting side. 454 */ 455 smp_wmb(); 456 req->status = status; 457 458 wake_up(req->wq); 459 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag); 460 } 461 EXPORT_SYMBOL(p9_client_cb); 462 463 /** 464 * p9_parse_header - parse header arguments out of a packet 465 * @pdu: packet to parse 466 * @size: size of packet 467 * @type: type of request 468 * @tag: tag of packet 469 * @rewind: set if we need to rewind offset afterwards 470 */ 471 472 int 473 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, 474 int rewind) 475 { 476 int8_t r_type; 477 int16_t r_tag; 478 int32_t r_size; 479 int offset = pdu->offset; 480 int err; 481 482 pdu->offset = 0; 483 if (pdu->size == 0) 484 pdu->size = 7; 485 486 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 487 if (err) 488 goto rewind_and_exit; 489 490 pdu->size = r_size; 491 pdu->id = r_type; 492 pdu->tag = r_tag; 493 494 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 495 pdu->size, pdu->id, pdu->tag); 496 497 if (type) 498 *type = r_type; 499 if (tag) 500 *tag = r_tag; 501 if (size) 502 *size = r_size; 503 504 505 rewind_and_exit: 506 if (rewind) 507 pdu->offset = offset; 508 return err; 509 } 510 EXPORT_SYMBOL(p9_parse_header); 511 512 /** 513 * p9_check_errors - check 9p packet for error return and process it 514 * @c: current client instance 515 * @req: request to parse and check for error conditions 516 * 517 * returns error code if one is discovered, otherwise returns 0 518 * 519 * this will have to be more complicated if we have multiple 520 * error packet types 521 */ 522 523 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 524 { 525 int8_t type; 526 int err; 527 int ecode; 528 529 err = p9_parse_header(req->rc, NULL, &type, NULL, 0); 530 /* 531 * dump the response from server 532 * This should be after check errors which poplulate pdu_fcall. 533 */ 534 trace_9p_protocol_dump(c, req->rc); 535 if (err) { 536 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 537 return err; 538 } 539 if (type != P9_RERROR && type != P9_RLERROR) 540 return 0; 541 542 if (!p9_is_proto_dotl(c)) { 543 char *ename; 544 err = p9pdu_readf(req->rc, c->proto_version, "s?d", 545 &ename, &ecode); 546 if (err) 547 goto out_err; 548 549 if (p9_is_proto_dotu(c) && ecode < 512) 550 err = -ecode; 551 552 if (!err) { 553 err = p9_errstr2errno(ename, strlen(ename)); 554 555 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 556 -ecode, ename); 557 } 558 kfree(ename); 559 } else { 560 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); 561 err = -ecode; 562 563 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 564 } 565 566 return err; 567 568 out_err: 569 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 570 571 return err; 572 } 573 574 /** 575 * p9_check_zc_errors - check 9p packet for error return and process it 576 * @c: current client instance 577 * @req: request to parse and check for error conditions 578 * @in_hdrlen: Size of response protocol buffer. 579 * 580 * returns error code if one is discovered, otherwise returns 0 581 * 582 * this will have to be more complicated if we have multiple 583 * error packet types 584 */ 585 586 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req, 587 struct iov_iter *uidata, int in_hdrlen) 588 { 589 int err; 590 int ecode; 591 int8_t type; 592 char *ename = NULL; 593 594 err = p9_parse_header(req->rc, NULL, &type, NULL, 0); 595 /* 596 * dump the response from server 597 * This should be after parse_header which poplulate pdu_fcall. 598 */ 599 trace_9p_protocol_dump(c, req->rc); 600 if (err) { 601 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 602 return err; 603 } 604 605 if (type != P9_RERROR && type != P9_RLERROR) 606 return 0; 607 608 if (!p9_is_proto_dotl(c)) { 609 /* Error is reported in string format */ 610 int len; 611 /* 7 = header size for RERROR; */ 612 int inline_len = in_hdrlen - 7; 613 614 len = req->rc->size - req->rc->offset; 615 if (len > (P9_ZC_HDR_SZ - 7)) { 616 err = -EFAULT; 617 goto out_err; 618 } 619 620 ename = &req->rc->sdata[req->rc->offset]; 621 if (len > inline_len) { 622 /* We have error in external buffer */ 623 if (!copy_from_iter_full(ename + inline_len, 624 len - inline_len, uidata)) { 625 err = -EFAULT; 626 goto out_err; 627 } 628 } 629 ename = NULL; 630 err = p9pdu_readf(req->rc, c->proto_version, "s?d", 631 &ename, &ecode); 632 if (err) 633 goto out_err; 634 635 if (p9_is_proto_dotu(c) && ecode < 512) 636 err = -ecode; 637 638 if (!err) { 639 err = p9_errstr2errno(ename, strlen(ename)); 640 641 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 642 -ecode, ename); 643 } 644 kfree(ename); 645 } else { 646 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); 647 err = -ecode; 648 649 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 650 } 651 return err; 652 653 out_err: 654 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 655 return err; 656 } 657 658 static struct p9_req_t * 659 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 660 661 /** 662 * p9_client_flush - flush (cancel) a request 663 * @c: client state 664 * @oldreq: request to cancel 665 * 666 * This sents a flush for a particular request and links 667 * the flush request to the original request. The current 668 * code only supports a single flush request although the protocol 669 * allows for multiple flush requests to be sent for a single request. 670 * 671 */ 672 673 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 674 { 675 struct p9_req_t *req; 676 int16_t oldtag; 677 int err; 678 679 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); 680 if (err) 681 return err; 682 683 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 684 685 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 686 if (IS_ERR(req)) 687 return PTR_ERR(req); 688 689 /* 690 * if we haven't received a response for oldreq, 691 * remove it from the list 692 */ 693 if (oldreq->status == REQ_STATUS_SENT) 694 if (c->trans_mod->cancelled) 695 c->trans_mod->cancelled(c, oldreq); 696 697 p9_free_req(c, req); 698 return 0; 699 } 700 701 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 702 int8_t type, int req_size, 703 const char *fmt, va_list ap) 704 { 705 int tag, err; 706 struct p9_req_t *req; 707 708 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 709 710 /* we allow for any status other than disconnected */ 711 if (c->status == Disconnected) 712 return ERR_PTR(-EIO); 713 714 /* if status is begin_disconnected we allow only clunk request */ 715 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) 716 return ERR_PTR(-EIO); 717 718 tag = P9_NOTAG; 719 if (type != P9_TVERSION) { 720 tag = p9_idpool_get(c->tagpool); 721 if (tag < 0) 722 return ERR_PTR(-ENOMEM); 723 } 724 725 req = p9_tag_alloc(c, tag, req_size); 726 if (IS_ERR(req)) 727 return req; 728 729 /* marshall the data */ 730 p9pdu_prepare(req->tc, tag, type); 731 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap); 732 if (err) 733 goto reterr; 734 p9pdu_finalize(c, req->tc); 735 trace_9p_client_req(c, type, tag); 736 return req; 737 reterr: 738 p9_free_req(c, req); 739 return ERR_PTR(err); 740 } 741 742 /** 743 * p9_client_rpc - issue a request and wait for a response 744 * @c: client session 745 * @type: type of request 746 * @fmt: protocol format string (see protocol.c) 747 * 748 * Returns request structure (which client must free using p9_free_req) 749 */ 750 751 static struct p9_req_t * 752 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 753 { 754 va_list ap; 755 int sigpending, err; 756 unsigned long flags; 757 struct p9_req_t *req; 758 759 va_start(ap, fmt); 760 req = p9_client_prepare_req(c, type, c->msize, fmt, ap); 761 va_end(ap); 762 if (IS_ERR(req)) 763 return req; 764 765 if (signal_pending(current)) { 766 sigpending = 1; 767 clear_thread_flag(TIF_SIGPENDING); 768 } else 769 sigpending = 0; 770 771 err = c->trans_mod->request(c, req); 772 if (err < 0) { 773 if (err != -ERESTARTSYS && err != -EFAULT) 774 c->status = Disconnected; 775 goto recalc_sigpending; 776 } 777 again: 778 /* Wait for the response */ 779 err = wait_event_killable(*req->wq, req->status >= REQ_STATUS_RCVD); 780 781 /* 782 * Make sure our req is coherent with regard to updates in other 783 * threads - echoes to wmb() in the callback 784 */ 785 smp_rmb(); 786 787 if ((err == -ERESTARTSYS) && (c->status == Connected) 788 && (type == P9_TFLUSH)) { 789 sigpending = 1; 790 clear_thread_flag(TIF_SIGPENDING); 791 goto again; 792 } 793 794 if (req->status == REQ_STATUS_ERROR) { 795 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 796 err = req->t_err; 797 } 798 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 799 p9_debug(P9_DEBUG_MUX, "flushing\n"); 800 sigpending = 1; 801 clear_thread_flag(TIF_SIGPENDING); 802 803 if (c->trans_mod->cancel(c, req)) 804 p9_client_flush(c, req); 805 806 /* if we received the response anyway, don't signal error */ 807 if (req->status == REQ_STATUS_RCVD) 808 err = 0; 809 } 810 recalc_sigpending: 811 if (sigpending) { 812 spin_lock_irqsave(¤t->sighand->siglock, flags); 813 recalc_sigpending(); 814 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 815 } 816 if (err < 0) 817 goto reterr; 818 819 err = p9_check_errors(c, req); 820 trace_9p_client_res(c, type, req->rc->tag, err); 821 if (!err) 822 return req; 823 reterr: 824 p9_free_req(c, req); 825 return ERR_PTR(safe_errno(err)); 826 } 827 828 /** 829 * p9_client_zc_rpc - issue a request and wait for a response 830 * @c: client session 831 * @type: type of request 832 * @uidata: destination for zero copy read 833 * @uodata: source for zero copy write 834 * @inlen: read buffer size 835 * @olen: write buffer size 836 * @hdrlen: reader header size, This is the size of response protocol data 837 * @fmt: protocol format string (see protocol.c) 838 * 839 * Returns request structure (which client must free using p9_free_req) 840 */ 841 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 842 struct iov_iter *uidata, 843 struct iov_iter *uodata, 844 int inlen, int olen, int in_hdrlen, 845 const char *fmt, ...) 846 { 847 va_list ap; 848 int sigpending, err; 849 unsigned long flags; 850 struct p9_req_t *req; 851 852 va_start(ap, fmt); 853 /* 854 * We allocate a inline protocol data of only 4k bytes. 855 * The actual content is passed in zero-copy fashion. 856 */ 857 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); 858 va_end(ap); 859 if (IS_ERR(req)) 860 return req; 861 862 if (signal_pending(current)) { 863 sigpending = 1; 864 clear_thread_flag(TIF_SIGPENDING); 865 } else 866 sigpending = 0; 867 868 err = c->trans_mod->zc_request(c, req, uidata, uodata, 869 inlen, olen, in_hdrlen); 870 if (err < 0) { 871 if (err == -EIO) 872 c->status = Disconnected; 873 if (err != -ERESTARTSYS) 874 goto recalc_sigpending; 875 } 876 if (req->status == REQ_STATUS_ERROR) { 877 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 878 err = req->t_err; 879 } 880 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 881 p9_debug(P9_DEBUG_MUX, "flushing\n"); 882 sigpending = 1; 883 clear_thread_flag(TIF_SIGPENDING); 884 885 if (c->trans_mod->cancel(c, req)) 886 p9_client_flush(c, req); 887 888 /* if we received the response anyway, don't signal error */ 889 if (req->status == REQ_STATUS_RCVD) 890 err = 0; 891 } 892 recalc_sigpending: 893 if (sigpending) { 894 spin_lock_irqsave(¤t->sighand->siglock, flags); 895 recalc_sigpending(); 896 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 897 } 898 if (err < 0) 899 goto reterr; 900 901 err = p9_check_zc_errors(c, req, uidata, in_hdrlen); 902 trace_9p_client_res(c, type, req->rc->tag, err); 903 if (!err) 904 return req; 905 reterr: 906 p9_free_req(c, req); 907 return ERR_PTR(safe_errno(err)); 908 } 909 910 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 911 { 912 int ret; 913 struct p9_fid *fid; 914 unsigned long flags; 915 916 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 917 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 918 if (!fid) 919 return ERR_PTR(-ENOMEM); 920 921 ret = p9_idpool_get(clnt->fidpool); 922 if (ret < 0) { 923 ret = -ENOSPC; 924 goto error; 925 } 926 fid->fid = ret; 927 928 memset(&fid->qid, 0, sizeof(struct p9_qid)); 929 fid->mode = -1; 930 fid->uid = current_fsuid(); 931 fid->clnt = clnt; 932 fid->rdir = NULL; 933 spin_lock_irqsave(&clnt->lock, flags); 934 list_add(&fid->flist, &clnt->fidlist); 935 spin_unlock_irqrestore(&clnt->lock, flags); 936 937 return fid; 938 939 error: 940 kfree(fid); 941 return ERR_PTR(ret); 942 } 943 944 static void p9_fid_destroy(struct p9_fid *fid) 945 { 946 struct p9_client *clnt; 947 unsigned long flags; 948 949 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 950 clnt = fid->clnt; 951 p9_idpool_put(fid->fid, clnt->fidpool); 952 spin_lock_irqsave(&clnt->lock, flags); 953 list_del(&fid->flist); 954 spin_unlock_irqrestore(&clnt->lock, flags); 955 kfree(fid->rdir); 956 kfree(fid); 957 } 958 959 static int p9_client_version(struct p9_client *c) 960 { 961 int err = 0; 962 struct p9_req_t *req; 963 char *version; 964 int msize; 965 966 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 967 c->msize, c->proto_version); 968 969 switch (c->proto_version) { 970 case p9_proto_2000L: 971 req = p9_client_rpc(c, P9_TVERSION, "ds", 972 c->msize, "9P2000.L"); 973 break; 974 case p9_proto_2000u: 975 req = p9_client_rpc(c, P9_TVERSION, "ds", 976 c->msize, "9P2000.u"); 977 break; 978 case p9_proto_legacy: 979 req = p9_client_rpc(c, P9_TVERSION, "ds", 980 c->msize, "9P2000"); 981 break; 982 default: 983 return -EINVAL; 984 } 985 986 if (IS_ERR(req)) 987 return PTR_ERR(req); 988 989 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version); 990 if (err) { 991 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 992 trace_9p_protocol_dump(c, req->rc); 993 goto error; 994 } 995 996 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 997 if (!strncmp(version, "9P2000.L", 8)) 998 c->proto_version = p9_proto_2000L; 999 else if (!strncmp(version, "9P2000.u", 8)) 1000 c->proto_version = p9_proto_2000u; 1001 else if (!strncmp(version, "9P2000", 6)) 1002 c->proto_version = p9_proto_legacy; 1003 else { 1004 err = -EREMOTEIO; 1005 goto error; 1006 } 1007 1008 if (msize < c->msize) 1009 c->msize = msize; 1010 1011 error: 1012 kfree(version); 1013 p9_free_req(c, req); 1014 1015 return err; 1016 } 1017 1018 struct p9_client *p9_client_create(const char *dev_name, char *options) 1019 { 1020 int err; 1021 struct p9_client *clnt; 1022 char *client_id; 1023 1024 err = 0; 1025 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 1026 if (!clnt) 1027 return ERR_PTR(-ENOMEM); 1028 1029 clnt->trans_mod = NULL; 1030 clnt->trans = NULL; 1031 1032 client_id = utsname()->nodename; 1033 memcpy(clnt->name, client_id, strlen(client_id) + 1); 1034 1035 spin_lock_init(&clnt->lock); 1036 INIT_LIST_HEAD(&clnt->fidlist); 1037 1038 err = p9_tag_init(clnt); 1039 if (err < 0) 1040 goto free_client; 1041 1042 err = parse_opts(options, clnt); 1043 if (err < 0) 1044 goto destroy_tagpool; 1045 1046 if (!clnt->trans_mod) 1047 clnt->trans_mod = v9fs_get_default_trans(); 1048 1049 if (clnt->trans_mod == NULL) { 1050 err = -EPROTONOSUPPORT; 1051 p9_debug(P9_DEBUG_ERROR, 1052 "No transport defined or default transport\n"); 1053 goto destroy_tagpool; 1054 } 1055 1056 clnt->fidpool = p9_idpool_create(); 1057 if (IS_ERR(clnt->fidpool)) { 1058 err = PTR_ERR(clnt->fidpool); 1059 goto put_trans; 1060 } 1061 1062 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1063 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1064 1065 err = clnt->trans_mod->create(clnt, dev_name, options); 1066 if (err) 1067 goto destroy_fidpool; 1068 1069 if (clnt->msize > clnt->trans_mod->maxsize) 1070 clnt->msize = clnt->trans_mod->maxsize; 1071 1072 err = p9_client_version(clnt); 1073 if (err) 1074 goto close_trans; 1075 1076 return clnt; 1077 1078 close_trans: 1079 clnt->trans_mod->close(clnt); 1080 destroy_fidpool: 1081 p9_idpool_destroy(clnt->fidpool); 1082 put_trans: 1083 v9fs_put_trans(clnt->trans_mod); 1084 destroy_tagpool: 1085 p9_idpool_destroy(clnt->tagpool); 1086 free_client: 1087 kfree(clnt); 1088 return ERR_PTR(err); 1089 } 1090 EXPORT_SYMBOL(p9_client_create); 1091 1092 void p9_client_destroy(struct p9_client *clnt) 1093 { 1094 struct p9_fid *fid, *fidptr; 1095 1096 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1097 1098 if (clnt->trans_mod) 1099 clnt->trans_mod->close(clnt); 1100 1101 v9fs_put_trans(clnt->trans_mod); 1102 1103 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) { 1104 pr_info("Found fid %d not clunked\n", fid->fid); 1105 p9_fid_destroy(fid); 1106 } 1107 1108 if (clnt->fidpool) 1109 p9_idpool_destroy(clnt->fidpool); 1110 1111 p9_tag_cleanup(clnt); 1112 1113 kfree(clnt); 1114 } 1115 EXPORT_SYMBOL(p9_client_destroy); 1116 1117 void p9_client_disconnect(struct p9_client *clnt) 1118 { 1119 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1120 clnt->status = Disconnected; 1121 } 1122 EXPORT_SYMBOL(p9_client_disconnect); 1123 1124 void p9_client_begin_disconnect(struct p9_client *clnt) 1125 { 1126 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1127 clnt->status = BeginDisconnect; 1128 } 1129 EXPORT_SYMBOL(p9_client_begin_disconnect); 1130 1131 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1132 const char *uname, kuid_t n_uname, const char *aname) 1133 { 1134 int err = 0; 1135 struct p9_req_t *req; 1136 struct p9_fid *fid; 1137 struct p9_qid qid; 1138 1139 1140 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1141 afid ? afid->fid : -1, uname, aname); 1142 fid = p9_fid_create(clnt); 1143 if (IS_ERR(fid)) { 1144 err = PTR_ERR(fid); 1145 fid = NULL; 1146 goto error; 1147 } 1148 fid->uid = n_uname; 1149 1150 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1151 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1152 if (IS_ERR(req)) { 1153 err = PTR_ERR(req); 1154 goto error; 1155 } 1156 1157 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid); 1158 if (err) { 1159 trace_9p_protocol_dump(clnt, req->rc); 1160 p9_free_req(clnt, req); 1161 goto error; 1162 } 1163 1164 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1165 qid.type, (unsigned long long)qid.path, qid.version); 1166 1167 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1168 1169 p9_free_req(clnt, req); 1170 return fid; 1171 1172 error: 1173 if (fid) 1174 p9_fid_destroy(fid); 1175 return ERR_PTR(err); 1176 } 1177 EXPORT_SYMBOL(p9_client_attach); 1178 1179 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1180 const unsigned char * const *wnames, int clone) 1181 { 1182 int err; 1183 struct p9_client *clnt; 1184 struct p9_fid *fid; 1185 struct p9_qid *wqids; 1186 struct p9_req_t *req; 1187 uint16_t nwqids, count; 1188 1189 err = 0; 1190 wqids = NULL; 1191 clnt = oldfid->clnt; 1192 if (clone) { 1193 fid = p9_fid_create(clnt); 1194 if (IS_ERR(fid)) { 1195 err = PTR_ERR(fid); 1196 fid = NULL; 1197 goto error; 1198 } 1199 1200 fid->uid = oldfid->uid; 1201 } else 1202 fid = oldfid; 1203 1204 1205 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1206 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1207 1208 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1209 nwname, wnames); 1210 if (IS_ERR(req)) { 1211 err = PTR_ERR(req); 1212 goto error; 1213 } 1214 1215 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1216 if (err) { 1217 trace_9p_protocol_dump(clnt, req->rc); 1218 p9_free_req(clnt, req); 1219 goto clunk_fid; 1220 } 1221 p9_free_req(clnt, req); 1222 1223 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1224 1225 if (nwqids != nwname) { 1226 err = -ENOENT; 1227 goto clunk_fid; 1228 } 1229 1230 for (count = 0; count < nwqids; count++) 1231 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1232 count, wqids[count].type, 1233 (unsigned long long)wqids[count].path, 1234 wqids[count].version); 1235 1236 if (nwname) 1237 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1238 else 1239 fid->qid = oldfid->qid; 1240 1241 kfree(wqids); 1242 return fid; 1243 1244 clunk_fid: 1245 kfree(wqids); 1246 p9_client_clunk(fid); 1247 fid = NULL; 1248 1249 error: 1250 if (fid && (fid != oldfid)) 1251 p9_fid_destroy(fid); 1252 1253 return ERR_PTR(err); 1254 } 1255 EXPORT_SYMBOL(p9_client_walk); 1256 1257 int p9_client_open(struct p9_fid *fid, int mode) 1258 { 1259 int err; 1260 struct p9_client *clnt; 1261 struct p9_req_t *req; 1262 struct p9_qid qid; 1263 int iounit; 1264 1265 clnt = fid->clnt; 1266 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1267 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1268 err = 0; 1269 1270 if (fid->mode != -1) 1271 return -EINVAL; 1272 1273 if (p9_is_proto_dotl(clnt)) 1274 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1275 else 1276 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1277 if (IS_ERR(req)) { 1278 err = PTR_ERR(req); 1279 goto error; 1280 } 1281 1282 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1283 if (err) { 1284 trace_9p_protocol_dump(clnt, req->rc); 1285 goto free_and_error; 1286 } 1287 1288 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1289 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1290 (unsigned long long)qid.path, qid.version, iounit); 1291 1292 fid->mode = mode; 1293 fid->iounit = iounit; 1294 1295 free_and_error: 1296 p9_free_req(clnt, req); 1297 error: 1298 return err; 1299 } 1300 EXPORT_SYMBOL(p9_client_open); 1301 1302 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode, 1303 kgid_t gid, struct p9_qid *qid) 1304 { 1305 int err = 0; 1306 struct p9_client *clnt; 1307 struct p9_req_t *req; 1308 int iounit; 1309 1310 p9_debug(P9_DEBUG_9P, 1311 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1312 ofid->fid, name, flags, mode, 1313 from_kgid(&init_user_ns, gid)); 1314 clnt = ofid->clnt; 1315 1316 if (ofid->mode != -1) 1317 return -EINVAL; 1318 1319 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1320 mode, gid); 1321 if (IS_ERR(req)) { 1322 err = PTR_ERR(req); 1323 goto error; 1324 } 1325 1326 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit); 1327 if (err) { 1328 trace_9p_protocol_dump(clnt, req->rc); 1329 goto free_and_error; 1330 } 1331 1332 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1333 qid->type, 1334 (unsigned long long)qid->path, 1335 qid->version, iounit); 1336 1337 ofid->mode = mode; 1338 ofid->iounit = iounit; 1339 1340 free_and_error: 1341 p9_free_req(clnt, req); 1342 error: 1343 return err; 1344 } 1345 EXPORT_SYMBOL(p9_client_create_dotl); 1346 1347 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1348 char *extension) 1349 { 1350 int err; 1351 struct p9_client *clnt; 1352 struct p9_req_t *req; 1353 struct p9_qid qid; 1354 int iounit; 1355 1356 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1357 fid->fid, name, perm, mode); 1358 err = 0; 1359 clnt = fid->clnt; 1360 1361 if (fid->mode != -1) 1362 return -EINVAL; 1363 1364 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1365 mode, extension); 1366 if (IS_ERR(req)) { 1367 err = PTR_ERR(req); 1368 goto error; 1369 } 1370 1371 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1372 if (err) { 1373 trace_9p_protocol_dump(clnt, req->rc); 1374 goto free_and_error; 1375 } 1376 1377 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1378 qid.type, 1379 (unsigned long long)qid.path, 1380 qid.version, iounit); 1381 1382 fid->mode = mode; 1383 fid->iounit = iounit; 1384 1385 free_and_error: 1386 p9_free_req(clnt, req); 1387 error: 1388 return err; 1389 } 1390 EXPORT_SYMBOL(p9_client_fcreate); 1391 1392 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1393 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1394 { 1395 int err = 0; 1396 struct p9_client *clnt; 1397 struct p9_req_t *req; 1398 1399 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1400 dfid->fid, name, symtgt); 1401 clnt = dfid->clnt; 1402 1403 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1404 gid); 1405 if (IS_ERR(req)) { 1406 err = PTR_ERR(req); 1407 goto error; 1408 } 1409 1410 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1411 if (err) { 1412 trace_9p_protocol_dump(clnt, req->rc); 1413 goto free_and_error; 1414 } 1415 1416 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1417 qid->type, (unsigned long long)qid->path, qid->version); 1418 1419 free_and_error: 1420 p9_free_req(clnt, req); 1421 error: 1422 return err; 1423 } 1424 EXPORT_SYMBOL(p9_client_symlink); 1425 1426 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1427 { 1428 struct p9_client *clnt; 1429 struct p9_req_t *req; 1430 1431 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1432 dfid->fid, oldfid->fid, newname); 1433 clnt = dfid->clnt; 1434 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1435 newname); 1436 if (IS_ERR(req)) 1437 return PTR_ERR(req); 1438 1439 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1440 p9_free_req(clnt, req); 1441 return 0; 1442 } 1443 EXPORT_SYMBOL(p9_client_link); 1444 1445 int p9_client_fsync(struct p9_fid *fid, int datasync) 1446 { 1447 int err; 1448 struct p9_client *clnt; 1449 struct p9_req_t *req; 1450 1451 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1452 fid->fid, datasync); 1453 err = 0; 1454 clnt = fid->clnt; 1455 1456 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1457 if (IS_ERR(req)) { 1458 err = PTR_ERR(req); 1459 goto error; 1460 } 1461 1462 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1463 1464 p9_free_req(clnt, req); 1465 1466 error: 1467 return err; 1468 } 1469 EXPORT_SYMBOL(p9_client_fsync); 1470 1471 int p9_client_clunk(struct p9_fid *fid) 1472 { 1473 int err; 1474 struct p9_client *clnt; 1475 struct p9_req_t *req; 1476 int retries = 0; 1477 1478 if (!fid) { 1479 pr_warn("%s (%d): Trying to clunk with NULL fid\n", 1480 __func__, task_pid_nr(current)); 1481 dump_stack(); 1482 return 0; 1483 } 1484 1485 again: 1486 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid, 1487 retries); 1488 err = 0; 1489 clnt = fid->clnt; 1490 1491 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1492 if (IS_ERR(req)) { 1493 err = PTR_ERR(req); 1494 goto error; 1495 } 1496 1497 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1498 1499 p9_free_req(clnt, req); 1500 error: 1501 /* 1502 * Fid is not valid even after a failed clunk 1503 * If interrupted, retry once then give up and 1504 * leak fid until umount. 1505 */ 1506 if (err == -ERESTARTSYS) { 1507 if (retries++ == 0) 1508 goto again; 1509 } else 1510 p9_fid_destroy(fid); 1511 return err; 1512 } 1513 EXPORT_SYMBOL(p9_client_clunk); 1514 1515 int p9_client_remove(struct p9_fid *fid) 1516 { 1517 int err; 1518 struct p9_client *clnt; 1519 struct p9_req_t *req; 1520 1521 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1522 err = 0; 1523 clnt = fid->clnt; 1524 1525 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1526 if (IS_ERR(req)) { 1527 err = PTR_ERR(req); 1528 goto error; 1529 } 1530 1531 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1532 1533 p9_free_req(clnt, req); 1534 error: 1535 if (err == -ERESTARTSYS) 1536 p9_client_clunk(fid); 1537 else 1538 p9_fid_destroy(fid); 1539 return err; 1540 } 1541 EXPORT_SYMBOL(p9_client_remove); 1542 1543 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1544 { 1545 int err = 0; 1546 struct p9_req_t *req; 1547 struct p9_client *clnt; 1548 1549 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1550 dfid->fid, name, flags); 1551 1552 clnt = dfid->clnt; 1553 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1554 if (IS_ERR(req)) { 1555 err = PTR_ERR(req); 1556 goto error; 1557 } 1558 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1559 1560 p9_free_req(clnt, req); 1561 error: 1562 return err; 1563 } 1564 EXPORT_SYMBOL(p9_client_unlinkat); 1565 1566 int 1567 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1568 { 1569 struct p9_client *clnt = fid->clnt; 1570 struct p9_req_t *req; 1571 int total = 0; 1572 *err = 0; 1573 1574 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", 1575 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to)); 1576 1577 while (iov_iter_count(to)) { 1578 int count = iov_iter_count(to); 1579 int rsize, non_zc = 0; 1580 char *dataptr; 1581 1582 rsize = fid->iounit; 1583 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1584 rsize = clnt->msize - P9_IOHDRSZ; 1585 1586 if (count < rsize) 1587 rsize = count; 1588 1589 /* Don't bother zerocopy for small IO (< 1024) */ 1590 if (clnt->trans_mod->zc_request && rsize > 1024) { 1591 /* 1592 * response header len is 11 1593 * PDU Header(7) + IO Size (4) 1594 */ 1595 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1596 0, 11, "dqd", fid->fid, 1597 offset, rsize); 1598 } else { 1599 non_zc = 1; 1600 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1601 rsize); 1602 } 1603 if (IS_ERR(req)) { 1604 *err = PTR_ERR(req); 1605 break; 1606 } 1607 1608 *err = p9pdu_readf(req->rc, clnt->proto_version, 1609 "D", &count, &dataptr); 1610 if (*err) { 1611 trace_9p_protocol_dump(clnt, req->rc); 1612 p9_free_req(clnt, req); 1613 break; 1614 } 1615 if (rsize < count) { 1616 pr_err("bogus RREAD count (%d > %d)\n", count, rsize); 1617 count = rsize; 1618 } 1619 1620 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1621 if (!count) { 1622 p9_free_req(clnt, req); 1623 break; 1624 } 1625 1626 if (non_zc) { 1627 int n = copy_to_iter(dataptr, count, to); 1628 total += n; 1629 offset += n; 1630 if (n != count) { 1631 *err = -EFAULT; 1632 p9_free_req(clnt, req); 1633 break; 1634 } 1635 } else { 1636 iov_iter_advance(to, count); 1637 total += count; 1638 offset += count; 1639 } 1640 p9_free_req(clnt, req); 1641 } 1642 return total; 1643 } 1644 EXPORT_SYMBOL(p9_client_read); 1645 1646 int 1647 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1648 { 1649 struct p9_client *clnt = fid->clnt; 1650 struct p9_req_t *req; 1651 int total = 0; 1652 *err = 0; 1653 1654 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", 1655 fid->fid, (unsigned long long) offset, 1656 iov_iter_count(from)); 1657 1658 while (iov_iter_count(from)) { 1659 int count = iov_iter_count(from); 1660 int rsize = fid->iounit; 1661 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1662 rsize = clnt->msize - P9_IOHDRSZ; 1663 1664 if (count < rsize) 1665 rsize = count; 1666 1667 /* Don't bother zerocopy for small IO (< 1024) */ 1668 if (clnt->trans_mod->zc_request && rsize > 1024) { 1669 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1670 rsize, P9_ZC_HDR_SZ, "dqd", 1671 fid->fid, offset, rsize); 1672 } else { 1673 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1674 offset, rsize, from); 1675 } 1676 if (IS_ERR(req)) { 1677 *err = PTR_ERR(req); 1678 break; 1679 } 1680 1681 *err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count); 1682 if (*err) { 1683 trace_9p_protocol_dump(clnt, req->rc); 1684 p9_free_req(clnt, req); 1685 break; 1686 } 1687 if (rsize < count) { 1688 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize); 1689 count = rsize; 1690 } 1691 1692 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1693 1694 p9_free_req(clnt, req); 1695 iov_iter_advance(from, count); 1696 total += count; 1697 offset += count; 1698 } 1699 return total; 1700 } 1701 EXPORT_SYMBOL(p9_client_write); 1702 1703 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1704 { 1705 int err; 1706 struct p9_client *clnt; 1707 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1708 struct p9_req_t *req; 1709 u16 ignored; 1710 1711 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1712 1713 if (!ret) 1714 return ERR_PTR(-ENOMEM); 1715 1716 err = 0; 1717 clnt = fid->clnt; 1718 1719 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1720 if (IS_ERR(req)) { 1721 err = PTR_ERR(req); 1722 goto error; 1723 } 1724 1725 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret); 1726 if (err) { 1727 trace_9p_protocol_dump(clnt, req->rc); 1728 p9_free_req(clnt, req); 1729 goto error; 1730 } 1731 1732 p9_debug(P9_DEBUG_9P, 1733 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1734 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1735 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1736 "<<< uid=%d gid=%d n_muid=%d\n", 1737 ret->size, ret->type, ret->dev, ret->qid.type, 1738 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1739 ret->atime, ret->mtime, (unsigned long long)ret->length, 1740 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1741 from_kuid(&init_user_ns, ret->n_uid), 1742 from_kgid(&init_user_ns, ret->n_gid), 1743 from_kuid(&init_user_ns, ret->n_muid)); 1744 1745 p9_free_req(clnt, req); 1746 return ret; 1747 1748 error: 1749 kfree(ret); 1750 return ERR_PTR(err); 1751 } 1752 EXPORT_SYMBOL(p9_client_stat); 1753 1754 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1755 u64 request_mask) 1756 { 1757 int err; 1758 struct p9_client *clnt; 1759 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1760 GFP_KERNEL); 1761 struct p9_req_t *req; 1762 1763 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1764 fid->fid, request_mask); 1765 1766 if (!ret) 1767 return ERR_PTR(-ENOMEM); 1768 1769 err = 0; 1770 clnt = fid->clnt; 1771 1772 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1773 if (IS_ERR(req)) { 1774 err = PTR_ERR(req); 1775 goto error; 1776 } 1777 1778 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret); 1779 if (err) { 1780 trace_9p_protocol_dump(clnt, req->rc); 1781 p9_free_req(clnt, req); 1782 goto error; 1783 } 1784 1785 p9_debug(P9_DEBUG_9P, 1786 "<<< RGETATTR st_result_mask=%lld\n" 1787 "<<< qid=%x.%llx.%x\n" 1788 "<<< st_mode=%8.8x st_nlink=%llu\n" 1789 "<<< st_uid=%d st_gid=%d\n" 1790 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1791 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1792 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1793 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1794 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1795 "<<< st_gen=%lld st_data_version=%lld", 1796 ret->st_result_mask, ret->qid.type, ret->qid.path, 1797 ret->qid.version, ret->st_mode, ret->st_nlink, 1798 from_kuid(&init_user_ns, ret->st_uid), 1799 from_kgid(&init_user_ns, ret->st_gid), 1800 ret->st_rdev, ret->st_size, ret->st_blksize, 1801 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1802 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1803 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1804 ret->st_gen, ret->st_data_version); 1805 1806 p9_free_req(clnt, req); 1807 return ret; 1808 1809 error: 1810 kfree(ret); 1811 return ERR_PTR(err); 1812 } 1813 EXPORT_SYMBOL(p9_client_getattr_dotl); 1814 1815 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1816 { 1817 int ret; 1818 1819 /* NOTE: size shouldn't include its own length */ 1820 /* size[2] type[2] dev[4] qid[13] */ 1821 /* mode[4] atime[4] mtime[4] length[8]*/ 1822 /* name[s] uid[s] gid[s] muid[s] */ 1823 ret = 2+4+13+4+4+4+8+2+2+2+2; 1824 1825 if (wst->name) 1826 ret += strlen(wst->name); 1827 if (wst->uid) 1828 ret += strlen(wst->uid); 1829 if (wst->gid) 1830 ret += strlen(wst->gid); 1831 if (wst->muid) 1832 ret += strlen(wst->muid); 1833 1834 if ((proto_version == p9_proto_2000u) || 1835 (proto_version == p9_proto_2000L)) { 1836 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1837 if (wst->extension) 1838 ret += strlen(wst->extension); 1839 } 1840 1841 return ret; 1842 } 1843 1844 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1845 { 1846 int err; 1847 struct p9_req_t *req; 1848 struct p9_client *clnt; 1849 1850 err = 0; 1851 clnt = fid->clnt; 1852 wst->size = p9_client_statsize(wst, clnt->proto_version); 1853 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1854 p9_debug(P9_DEBUG_9P, 1855 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1856 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1857 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1858 " uid=%d gid=%d n_muid=%d\n", 1859 wst->size, wst->type, wst->dev, wst->qid.type, 1860 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1861 wst->atime, wst->mtime, (unsigned long long)wst->length, 1862 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1863 from_kuid(&init_user_ns, wst->n_uid), 1864 from_kgid(&init_user_ns, wst->n_gid), 1865 from_kuid(&init_user_ns, wst->n_muid)); 1866 1867 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1868 if (IS_ERR(req)) { 1869 err = PTR_ERR(req); 1870 goto error; 1871 } 1872 1873 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1874 1875 p9_free_req(clnt, req); 1876 error: 1877 return err; 1878 } 1879 EXPORT_SYMBOL(p9_client_wstat); 1880 1881 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1882 { 1883 int err; 1884 struct p9_req_t *req; 1885 struct p9_client *clnt; 1886 1887 err = 0; 1888 clnt = fid->clnt; 1889 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1890 p9_debug(P9_DEBUG_9P, 1891 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1892 " atime_sec=%lld atime_nsec=%lld\n" 1893 " mtime_sec=%lld mtime_nsec=%lld\n", 1894 p9attr->valid, p9attr->mode, 1895 from_kuid(&init_user_ns, p9attr->uid), 1896 from_kgid(&init_user_ns, p9attr->gid), 1897 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1898 p9attr->mtime_sec, p9attr->mtime_nsec); 1899 1900 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1901 1902 if (IS_ERR(req)) { 1903 err = PTR_ERR(req); 1904 goto error; 1905 } 1906 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1907 p9_free_req(clnt, req); 1908 error: 1909 return err; 1910 } 1911 EXPORT_SYMBOL(p9_client_setattr); 1912 1913 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1914 { 1915 int err; 1916 struct p9_req_t *req; 1917 struct p9_client *clnt; 1918 1919 err = 0; 1920 clnt = fid->clnt; 1921 1922 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1923 1924 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1925 if (IS_ERR(req)) { 1926 err = PTR_ERR(req); 1927 goto error; 1928 } 1929 1930 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1931 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1932 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1933 if (err) { 1934 trace_9p_protocol_dump(clnt, req->rc); 1935 p9_free_req(clnt, req); 1936 goto error; 1937 } 1938 1939 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1940 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1941 "fsid %llu namelen %ld\n", 1942 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1943 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1944 sb->fsid, (long int)sb->namelen); 1945 1946 p9_free_req(clnt, req); 1947 error: 1948 return err; 1949 } 1950 EXPORT_SYMBOL(p9_client_statfs); 1951 1952 int p9_client_rename(struct p9_fid *fid, 1953 struct p9_fid *newdirfid, const char *name) 1954 { 1955 int err; 1956 struct p9_req_t *req; 1957 struct p9_client *clnt; 1958 1959 err = 0; 1960 clnt = fid->clnt; 1961 1962 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1963 fid->fid, newdirfid->fid, name); 1964 1965 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1966 newdirfid->fid, name); 1967 if (IS_ERR(req)) { 1968 err = PTR_ERR(req); 1969 goto error; 1970 } 1971 1972 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1973 1974 p9_free_req(clnt, req); 1975 error: 1976 return err; 1977 } 1978 EXPORT_SYMBOL(p9_client_rename); 1979 1980 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1981 struct p9_fid *newdirfid, const char *new_name) 1982 { 1983 int err; 1984 struct p9_req_t *req; 1985 struct p9_client *clnt; 1986 1987 err = 0; 1988 clnt = olddirfid->clnt; 1989 1990 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" 1991 " newdirfid %d new name %s\n", olddirfid->fid, old_name, 1992 newdirfid->fid, new_name); 1993 1994 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1995 old_name, newdirfid->fid, new_name); 1996 if (IS_ERR(req)) { 1997 err = PTR_ERR(req); 1998 goto error; 1999 } 2000 2001 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 2002 newdirfid->fid, new_name); 2003 2004 p9_free_req(clnt, req); 2005 error: 2006 return err; 2007 } 2008 EXPORT_SYMBOL(p9_client_renameat); 2009 2010 /* 2011 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 2012 */ 2013 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 2014 const char *attr_name, u64 *attr_size) 2015 { 2016 int err; 2017 struct p9_req_t *req; 2018 struct p9_client *clnt; 2019 struct p9_fid *attr_fid; 2020 2021 err = 0; 2022 clnt = file_fid->clnt; 2023 attr_fid = p9_fid_create(clnt); 2024 if (IS_ERR(attr_fid)) { 2025 err = PTR_ERR(attr_fid); 2026 attr_fid = NULL; 2027 goto error; 2028 } 2029 p9_debug(P9_DEBUG_9P, 2030 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 2031 file_fid->fid, attr_fid->fid, attr_name); 2032 2033 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 2034 file_fid->fid, attr_fid->fid, attr_name); 2035 if (IS_ERR(req)) { 2036 err = PTR_ERR(req); 2037 goto error; 2038 } 2039 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size); 2040 if (err) { 2041 trace_9p_protocol_dump(clnt, req->rc); 2042 p9_free_req(clnt, req); 2043 goto clunk_fid; 2044 } 2045 p9_free_req(clnt, req); 2046 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2047 attr_fid->fid, *attr_size); 2048 return attr_fid; 2049 clunk_fid: 2050 p9_client_clunk(attr_fid); 2051 attr_fid = NULL; 2052 error: 2053 if (attr_fid && (attr_fid != file_fid)) 2054 p9_fid_destroy(attr_fid); 2055 2056 return ERR_PTR(err); 2057 } 2058 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2059 2060 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2061 u64 attr_size, int flags) 2062 { 2063 int err; 2064 struct p9_req_t *req; 2065 struct p9_client *clnt; 2066 2067 p9_debug(P9_DEBUG_9P, 2068 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 2069 fid->fid, name, (long long)attr_size, flags); 2070 err = 0; 2071 clnt = fid->clnt; 2072 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2073 fid->fid, name, attr_size, flags); 2074 if (IS_ERR(req)) { 2075 err = PTR_ERR(req); 2076 goto error; 2077 } 2078 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2079 p9_free_req(clnt, req); 2080 error: 2081 return err; 2082 } 2083 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2084 2085 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2086 { 2087 int err, rsize, non_zc = 0; 2088 struct p9_client *clnt; 2089 struct p9_req_t *req; 2090 char *dataptr; 2091 struct kvec kv = {.iov_base = data, .iov_len = count}; 2092 struct iov_iter to; 2093 2094 iov_iter_kvec(&to, READ | ITER_KVEC, &kv, 1, count); 2095 2096 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2097 fid->fid, (unsigned long long) offset, count); 2098 2099 err = 0; 2100 clnt = fid->clnt; 2101 2102 rsize = fid->iounit; 2103 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 2104 rsize = clnt->msize - P9_READDIRHDRSZ; 2105 2106 if (count < rsize) 2107 rsize = count; 2108 2109 /* Don't bother zerocopy for small IO (< 1024) */ 2110 if (clnt->trans_mod->zc_request && rsize > 1024) { 2111 /* 2112 * response header len is 11 2113 * PDU Header(7) + IO Size (4) 2114 */ 2115 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2116 11, "dqd", fid->fid, offset, rsize); 2117 } else { 2118 non_zc = 1; 2119 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2120 offset, rsize); 2121 } 2122 if (IS_ERR(req)) { 2123 err = PTR_ERR(req); 2124 goto error; 2125 } 2126 2127 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 2128 if (err) { 2129 trace_9p_protocol_dump(clnt, req->rc); 2130 goto free_and_error; 2131 } 2132 if (rsize < count) { 2133 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2134 count = rsize; 2135 } 2136 2137 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2138 2139 if (non_zc) 2140 memmove(data, dataptr, count); 2141 2142 p9_free_req(clnt, req); 2143 return count; 2144 2145 free_and_error: 2146 p9_free_req(clnt, req); 2147 error: 2148 return err; 2149 } 2150 EXPORT_SYMBOL(p9_client_readdir); 2151 2152 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2153 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2154 { 2155 int err; 2156 struct p9_client *clnt; 2157 struct p9_req_t *req; 2158 2159 err = 0; 2160 clnt = fid->clnt; 2161 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 2162 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2163 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2164 MAJOR(rdev), MINOR(rdev), gid); 2165 if (IS_ERR(req)) 2166 return PTR_ERR(req); 2167 2168 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 2169 if (err) { 2170 trace_9p_protocol_dump(clnt, req->rc); 2171 goto error; 2172 } 2173 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 2174 (unsigned long long)qid->path, qid->version); 2175 2176 error: 2177 p9_free_req(clnt, req); 2178 return err; 2179 2180 } 2181 EXPORT_SYMBOL(p9_client_mknod_dotl); 2182 2183 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2184 kgid_t gid, struct p9_qid *qid) 2185 { 2186 int err; 2187 struct p9_client *clnt; 2188 struct p9_req_t *req; 2189 2190 err = 0; 2191 clnt = fid->clnt; 2192 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2193 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2194 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode, 2195 gid); 2196 if (IS_ERR(req)) 2197 return PTR_ERR(req); 2198 2199 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 2200 if (err) { 2201 trace_9p_protocol_dump(clnt, req->rc); 2202 goto error; 2203 } 2204 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2205 (unsigned long long)qid->path, qid->version); 2206 2207 error: 2208 p9_free_req(clnt, req); 2209 return err; 2210 2211 } 2212 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2213 2214 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2215 { 2216 int err; 2217 struct p9_client *clnt; 2218 struct p9_req_t *req; 2219 2220 err = 0; 2221 clnt = fid->clnt; 2222 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " 2223 "start %lld length %lld proc_id %d client_id %s\n", 2224 fid->fid, flock->type, flock->flags, flock->start, 2225 flock->length, flock->proc_id, flock->client_id); 2226 2227 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2228 flock->flags, flock->start, flock->length, 2229 flock->proc_id, flock->client_id); 2230 2231 if (IS_ERR(req)) 2232 return PTR_ERR(req); 2233 2234 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status); 2235 if (err) { 2236 trace_9p_protocol_dump(clnt, req->rc); 2237 goto error; 2238 } 2239 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2240 error: 2241 p9_free_req(clnt, req); 2242 return err; 2243 2244 } 2245 EXPORT_SYMBOL(p9_client_lock_dotl); 2246 2247 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2248 { 2249 int err; 2250 struct p9_client *clnt; 2251 struct p9_req_t *req; 2252 2253 err = 0; 2254 clnt = fid->clnt; 2255 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " 2256 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, 2257 glock->start, glock->length, glock->proc_id, glock->client_id); 2258 2259 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, 2260 glock->start, glock->length, glock->proc_id, glock->client_id); 2261 2262 if (IS_ERR(req)) 2263 return PTR_ERR(req); 2264 2265 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type, 2266 &glock->start, &glock->length, &glock->proc_id, 2267 &glock->client_id); 2268 if (err) { 2269 trace_9p_protocol_dump(clnt, req->rc); 2270 goto error; 2271 } 2272 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " 2273 "proc_id %d client_id %s\n", glock->type, glock->start, 2274 glock->length, glock->proc_id, glock->client_id); 2275 error: 2276 p9_free_req(clnt, req); 2277 return err; 2278 } 2279 EXPORT_SYMBOL(p9_client_getlock_dotl); 2280 2281 int p9_client_readlink(struct p9_fid *fid, char **target) 2282 { 2283 int err; 2284 struct p9_client *clnt; 2285 struct p9_req_t *req; 2286 2287 err = 0; 2288 clnt = fid->clnt; 2289 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2290 2291 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2292 if (IS_ERR(req)) 2293 return PTR_ERR(req); 2294 2295 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target); 2296 if (err) { 2297 trace_9p_protocol_dump(clnt, req->rc); 2298 goto error; 2299 } 2300 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2301 error: 2302 p9_free_req(clnt, req); 2303 return err; 2304 } 2305 EXPORT_SYMBOL(p9_client_readlink); 2306