1 /* 2 * net/9p/clnt.c 3 * 4 * 9P Client 5 * 6 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> 7 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 11 * as published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to: 20 * Free Software Foundation 21 * 51 Franklin Street, Fifth Floor 22 * Boston, MA 02111-1301 USA 23 * 24 */ 25 26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 27 28 #include <linux/module.h> 29 #include <linux/errno.h> 30 #include <linux/fs.h> 31 #include <linux/poll.h> 32 #include <linux/idr.h> 33 #include <linux/mutex.h> 34 #include <linux/slab.h> 35 #include <linux/sched/signal.h> 36 #include <linux/uaccess.h> 37 #include <linux/uio.h> 38 #include <net/9p/9p.h> 39 #include <linux/parser.h> 40 #include <linux/seq_file.h> 41 #include <net/9p/client.h> 42 #include <net/9p/transport.h> 43 #include "protocol.h" 44 45 #define CREATE_TRACE_POINTS 46 #include <trace/events/9p.h> 47 48 /* 49 * Client Option Parsing (code inspired by NFS code) 50 * - a little lazy - parse all client options 51 */ 52 53 enum { 54 Opt_msize, 55 Opt_trans, 56 Opt_legacy, 57 Opt_version, 58 Opt_err, 59 }; 60 61 static const match_table_t tokens = { 62 {Opt_msize, "msize=%u"}, 63 {Opt_legacy, "noextend"}, 64 {Opt_trans, "trans=%s"}, 65 {Opt_version, "version=%s"}, 66 {Opt_err, NULL}, 67 }; 68 69 inline int p9_is_proto_dotl(struct p9_client *clnt) 70 { 71 return clnt->proto_version == p9_proto_2000L; 72 } 73 EXPORT_SYMBOL(p9_is_proto_dotl); 74 75 inline int p9_is_proto_dotu(struct p9_client *clnt) 76 { 77 return clnt->proto_version == p9_proto_2000u; 78 } 79 EXPORT_SYMBOL(p9_is_proto_dotu); 80 81 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt) 82 { 83 if (clnt->msize != 8192) 84 seq_printf(m, ",msize=%u", clnt->msize); 85 seq_printf(m, ",trans=%s", clnt->trans_mod->name); 86 87 switch (clnt->proto_version) { 88 case p9_proto_legacy: 89 seq_puts(m, ",noextend"); 90 break; 91 case p9_proto_2000u: 92 seq_puts(m, ",version=9p2000.u"); 93 break; 94 case p9_proto_2000L: 95 /* Default */ 96 break; 97 } 98 99 if (clnt->trans_mod->show_options) 100 return clnt->trans_mod->show_options(m, clnt); 101 return 0; 102 } 103 EXPORT_SYMBOL(p9_show_client_options); 104 105 /* 106 * Some error codes are taken directly from the server replies, 107 * make sure they are valid. 108 */ 109 static int safe_errno(int err) 110 { 111 if ((err > 0) || (err < -MAX_ERRNO)) { 112 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err); 113 return -EPROTO; 114 } 115 return err; 116 } 117 118 119 /* Interpret mount option for protocol version */ 120 static int get_protocol_version(char *s) 121 { 122 int version = -EINVAL; 123 124 if (!strcmp(s, "9p2000")) { 125 version = p9_proto_legacy; 126 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n"); 127 } else if (!strcmp(s, "9p2000.u")) { 128 version = p9_proto_2000u; 129 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); 130 } else if (!strcmp(s, "9p2000.L")) { 131 version = p9_proto_2000L; 132 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); 133 } else 134 pr_info("Unknown protocol version %s\n", s); 135 136 return version; 137 } 138 139 /** 140 * parse_options - parse mount options into client structure 141 * @opts: options string passed from mount 142 * @clnt: existing v9fs client information 143 * 144 * Return 0 upon success, -ERRNO upon failure 145 */ 146 147 static int parse_opts(char *opts, struct p9_client *clnt) 148 { 149 char *options, *tmp_options; 150 char *p; 151 substring_t args[MAX_OPT_ARGS]; 152 int option; 153 char *s; 154 int ret = 0; 155 156 clnt->proto_version = p9_proto_2000L; 157 clnt->msize = 8192; 158 159 if (!opts) 160 return 0; 161 162 tmp_options = kstrdup(opts, GFP_KERNEL); 163 if (!tmp_options) { 164 p9_debug(P9_DEBUG_ERROR, 165 "failed to allocate copy of option string\n"); 166 return -ENOMEM; 167 } 168 options = tmp_options; 169 170 while ((p = strsep(&options, ",")) != NULL) { 171 int token, r; 172 if (!*p) 173 continue; 174 token = match_token(p, tokens, args); 175 switch (token) { 176 case Opt_msize: 177 r = match_int(&args[0], &option); 178 if (r < 0) { 179 p9_debug(P9_DEBUG_ERROR, 180 "integer field, but no integer?\n"); 181 ret = r; 182 continue; 183 } 184 clnt->msize = option; 185 break; 186 case Opt_trans: 187 s = match_strdup(&args[0]); 188 if (!s) { 189 ret = -ENOMEM; 190 p9_debug(P9_DEBUG_ERROR, 191 "problem allocating copy of trans arg\n"); 192 goto free_and_return; 193 } 194 195 v9fs_put_trans(clnt->trans_mod); 196 clnt->trans_mod = v9fs_get_trans_by_name(s); 197 if (clnt->trans_mod == NULL) { 198 pr_info("Could not find request transport: %s\n", 199 s); 200 ret = -EINVAL; 201 } 202 kfree(s); 203 break; 204 case Opt_legacy: 205 clnt->proto_version = p9_proto_legacy; 206 break; 207 case Opt_version: 208 s = match_strdup(&args[0]); 209 if (!s) { 210 ret = -ENOMEM; 211 p9_debug(P9_DEBUG_ERROR, 212 "problem allocating copy of version arg\n"); 213 goto free_and_return; 214 } 215 r = get_protocol_version(s); 216 if (r < 0) 217 ret = r; 218 else 219 clnt->proto_version = r; 220 kfree(s); 221 break; 222 default: 223 continue; 224 } 225 } 226 227 free_and_return: 228 if (ret) 229 v9fs_put_trans(clnt->trans_mod); 230 kfree(tmp_options); 231 return ret; 232 } 233 234 static struct p9_fcall *p9_fcall_alloc(int alloc_msize) 235 { 236 struct p9_fcall *fc; 237 fc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, GFP_NOFS); 238 if (!fc) 239 return NULL; 240 fc->capacity = alloc_msize; 241 fc->sdata = (char *) fc + sizeof(struct p9_fcall); 242 return fc; 243 } 244 245 /** 246 * p9_tag_alloc - lookup/allocate a request by tag 247 * @c: client session to lookup tag within 248 * @tag: numeric id for transaction 249 * 250 * this is a simple array lookup, but will grow the 251 * request_slots as necessary to accommodate transaction 252 * ids which did not previously have a slot. 253 * 254 * this code relies on the client spinlock to manage locks, its 255 * possible we should switch to something else, but I'd rather 256 * stick with something low-overhead for the common case. 257 * 258 */ 259 260 static struct p9_req_t * 261 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size) 262 { 263 unsigned long flags; 264 int row, col; 265 struct p9_req_t *req; 266 int alloc_msize = min(c->msize, max_size); 267 268 /* This looks up the original request by tag so we know which 269 * buffer to read the data into */ 270 tag++; 271 272 if (tag >= c->max_tag) { 273 spin_lock_irqsave(&c->lock, flags); 274 /* check again since original check was outside of lock */ 275 while (tag >= c->max_tag) { 276 row = (tag / P9_ROW_MAXTAG); 277 c->reqs[row] = kcalloc(P9_ROW_MAXTAG, 278 sizeof(struct p9_req_t), GFP_ATOMIC); 279 280 if (!c->reqs[row]) { 281 pr_err("Couldn't grow tag array\n"); 282 spin_unlock_irqrestore(&c->lock, flags); 283 return ERR_PTR(-ENOMEM); 284 } 285 for (col = 0; col < P9_ROW_MAXTAG; col++) { 286 c->reqs[row][col].status = REQ_STATUS_IDLE; 287 c->reqs[row][col].tc = NULL; 288 } 289 c->max_tag += P9_ROW_MAXTAG; 290 } 291 spin_unlock_irqrestore(&c->lock, flags); 292 } 293 row = tag / P9_ROW_MAXTAG; 294 col = tag % P9_ROW_MAXTAG; 295 296 req = &c->reqs[row][col]; 297 if (!req->wq) { 298 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS); 299 if (!req->wq) 300 goto grow_failed; 301 init_waitqueue_head(req->wq); 302 } 303 304 if (!req->tc) 305 req->tc = p9_fcall_alloc(alloc_msize); 306 if (!req->rc) 307 req->rc = p9_fcall_alloc(alloc_msize); 308 if (!req->tc || !req->rc) 309 goto grow_failed; 310 311 p9pdu_reset(req->tc); 312 p9pdu_reset(req->rc); 313 314 req->tc->tag = tag-1; 315 req->status = REQ_STATUS_ALLOC; 316 317 return req; 318 319 grow_failed: 320 pr_err("Couldn't grow tag array\n"); 321 kfree(req->tc); 322 kfree(req->rc); 323 kfree(req->wq); 324 req->tc = req->rc = NULL; 325 req->wq = NULL; 326 return ERR_PTR(-ENOMEM); 327 } 328 329 /** 330 * p9_tag_lookup - lookup a request by tag 331 * @c: client session to lookup tag within 332 * @tag: numeric id for transaction 333 * 334 */ 335 336 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 337 { 338 int row, col; 339 340 /* This looks up the original request by tag so we know which 341 * buffer to read the data into */ 342 tag++; 343 344 if(tag >= c->max_tag) 345 return NULL; 346 347 row = tag / P9_ROW_MAXTAG; 348 col = tag % P9_ROW_MAXTAG; 349 350 return &c->reqs[row][col]; 351 } 352 EXPORT_SYMBOL(p9_tag_lookup); 353 354 /** 355 * p9_tag_init - setup tags structure and contents 356 * @c: v9fs client struct 357 * 358 * This initializes the tags structure for each client instance. 359 * 360 */ 361 362 static int p9_tag_init(struct p9_client *c) 363 { 364 int err = 0; 365 366 c->tagpool = p9_idpool_create(); 367 if (IS_ERR(c->tagpool)) { 368 err = PTR_ERR(c->tagpool); 369 goto error; 370 } 371 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */ 372 if (err < 0) { 373 p9_idpool_destroy(c->tagpool); 374 goto error; 375 } 376 c->max_tag = 0; 377 error: 378 return err; 379 } 380 381 /** 382 * p9_tag_cleanup - cleans up tags structure and reclaims resources 383 * @c: v9fs client struct 384 * 385 * This frees resources associated with the tags structure 386 * 387 */ 388 static void p9_tag_cleanup(struct p9_client *c) 389 { 390 int row, col; 391 392 /* check to insure all requests are idle */ 393 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 394 for (col = 0; col < P9_ROW_MAXTAG; col++) { 395 if (c->reqs[row][col].status != REQ_STATUS_IDLE) { 396 p9_debug(P9_DEBUG_MUX, 397 "Attempting to cleanup non-free tag %d,%d\n", 398 row, col); 399 /* TODO: delay execution of cleanup */ 400 return; 401 } 402 } 403 } 404 405 if (c->tagpool) { 406 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */ 407 p9_idpool_destroy(c->tagpool); 408 } 409 410 /* free requests associated with tags */ 411 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 412 for (col = 0; col < P9_ROW_MAXTAG; col++) { 413 kfree(c->reqs[row][col].wq); 414 kfree(c->reqs[row][col].tc); 415 kfree(c->reqs[row][col].rc); 416 } 417 kfree(c->reqs[row]); 418 } 419 c->max_tag = 0; 420 } 421 422 /** 423 * p9_free_req - free a request and clean-up as necessary 424 * c: client state 425 * r: request to release 426 * 427 */ 428 429 static void p9_free_req(struct p9_client *c, struct p9_req_t *r) 430 { 431 int tag = r->tc->tag; 432 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); 433 434 r->status = REQ_STATUS_IDLE; 435 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool)) 436 p9_idpool_put(tag, c->tagpool); 437 } 438 439 /** 440 * p9_client_cb - call back from transport to client 441 * c: client state 442 * req: request received 443 * 444 */ 445 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) 446 { 447 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag); 448 449 /* 450 * This barrier is needed to make sure any change made to req before 451 * the other thread wakes up will indeed be seen by the waiting side. 452 */ 453 smp_wmb(); 454 req->status = status; 455 456 wake_up(req->wq); 457 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag); 458 } 459 EXPORT_SYMBOL(p9_client_cb); 460 461 /** 462 * p9_parse_header - parse header arguments out of a packet 463 * @pdu: packet to parse 464 * @size: size of packet 465 * @type: type of request 466 * @tag: tag of packet 467 * @rewind: set if we need to rewind offset afterwards 468 */ 469 470 int 471 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, 472 int rewind) 473 { 474 int8_t r_type; 475 int16_t r_tag; 476 int32_t r_size; 477 int offset = pdu->offset; 478 int err; 479 480 pdu->offset = 0; 481 if (pdu->size == 0) 482 pdu->size = 7; 483 484 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 485 if (err) 486 goto rewind_and_exit; 487 488 pdu->size = r_size; 489 pdu->id = r_type; 490 pdu->tag = r_tag; 491 492 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 493 pdu->size, pdu->id, pdu->tag); 494 495 if (type) 496 *type = r_type; 497 if (tag) 498 *tag = r_tag; 499 if (size) 500 *size = r_size; 501 502 503 rewind_and_exit: 504 if (rewind) 505 pdu->offset = offset; 506 return err; 507 } 508 EXPORT_SYMBOL(p9_parse_header); 509 510 /** 511 * p9_check_errors - check 9p packet for error return and process it 512 * @c: current client instance 513 * @req: request to parse and check for error conditions 514 * 515 * returns error code if one is discovered, otherwise returns 0 516 * 517 * this will have to be more complicated if we have multiple 518 * error packet types 519 */ 520 521 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 522 { 523 int8_t type; 524 int err; 525 int ecode; 526 527 err = p9_parse_header(req->rc, NULL, &type, NULL, 0); 528 /* 529 * dump the response from server 530 * This should be after check errors which poplulate pdu_fcall. 531 */ 532 trace_9p_protocol_dump(c, req->rc); 533 if (err) { 534 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 535 return err; 536 } 537 if (type != P9_RERROR && type != P9_RLERROR) 538 return 0; 539 540 if (!p9_is_proto_dotl(c)) { 541 char *ename; 542 err = p9pdu_readf(req->rc, c->proto_version, "s?d", 543 &ename, &ecode); 544 if (err) 545 goto out_err; 546 547 if (p9_is_proto_dotu(c) && ecode < 512) 548 err = -ecode; 549 550 if (!err) { 551 err = p9_errstr2errno(ename, strlen(ename)); 552 553 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 554 -ecode, ename); 555 } 556 kfree(ename); 557 } else { 558 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); 559 err = -ecode; 560 561 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 562 } 563 564 return err; 565 566 out_err: 567 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 568 569 return err; 570 } 571 572 /** 573 * p9_check_zc_errors - check 9p packet for error return and process it 574 * @c: current client instance 575 * @req: request to parse and check for error conditions 576 * @in_hdrlen: Size of response protocol buffer. 577 * 578 * returns error code if one is discovered, otherwise returns 0 579 * 580 * this will have to be more complicated if we have multiple 581 * error packet types 582 */ 583 584 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req, 585 struct iov_iter *uidata, int in_hdrlen) 586 { 587 int err; 588 int ecode; 589 int8_t type; 590 char *ename = NULL; 591 592 err = p9_parse_header(req->rc, NULL, &type, NULL, 0); 593 /* 594 * dump the response from server 595 * This should be after parse_header which poplulate pdu_fcall. 596 */ 597 trace_9p_protocol_dump(c, req->rc); 598 if (err) { 599 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 600 return err; 601 } 602 603 if (type != P9_RERROR && type != P9_RLERROR) 604 return 0; 605 606 if (!p9_is_proto_dotl(c)) { 607 /* Error is reported in string format */ 608 int len; 609 /* 7 = header size for RERROR; */ 610 int inline_len = in_hdrlen - 7; 611 612 len = req->rc->size - req->rc->offset; 613 if (len > (P9_ZC_HDR_SZ - 7)) { 614 err = -EFAULT; 615 goto out_err; 616 } 617 618 ename = &req->rc->sdata[req->rc->offset]; 619 if (len > inline_len) { 620 /* We have error in external buffer */ 621 if (!copy_from_iter_full(ename + inline_len, 622 len - inline_len, uidata)) { 623 err = -EFAULT; 624 goto out_err; 625 } 626 } 627 ename = NULL; 628 err = p9pdu_readf(req->rc, c->proto_version, "s?d", 629 &ename, &ecode); 630 if (err) 631 goto out_err; 632 633 if (p9_is_proto_dotu(c) && ecode < 512) 634 err = -ecode; 635 636 if (!err) { 637 err = p9_errstr2errno(ename, strlen(ename)); 638 639 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 640 -ecode, ename); 641 } 642 kfree(ename); 643 } else { 644 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); 645 err = -ecode; 646 647 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 648 } 649 return err; 650 651 out_err: 652 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 653 return err; 654 } 655 656 static struct p9_req_t * 657 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 658 659 /** 660 * p9_client_flush - flush (cancel) a request 661 * @c: client state 662 * @oldreq: request to cancel 663 * 664 * This sents a flush for a particular request and links 665 * the flush request to the original request. The current 666 * code only supports a single flush request although the protocol 667 * allows for multiple flush requests to be sent for a single request. 668 * 669 */ 670 671 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 672 { 673 struct p9_req_t *req; 674 int16_t oldtag; 675 int err; 676 677 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); 678 if (err) 679 return err; 680 681 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 682 683 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 684 if (IS_ERR(req)) 685 return PTR_ERR(req); 686 687 /* 688 * if we haven't received a response for oldreq, 689 * remove it from the list 690 */ 691 if (oldreq->status == REQ_STATUS_SENT) 692 if (c->trans_mod->cancelled) 693 c->trans_mod->cancelled(c, oldreq); 694 695 p9_free_req(c, req); 696 return 0; 697 } 698 699 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 700 int8_t type, int req_size, 701 const char *fmt, va_list ap) 702 { 703 int tag, err; 704 struct p9_req_t *req; 705 706 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 707 708 /* we allow for any status other than disconnected */ 709 if (c->status == Disconnected) 710 return ERR_PTR(-EIO); 711 712 /* if status is begin_disconnected we allow only clunk request */ 713 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) 714 return ERR_PTR(-EIO); 715 716 tag = P9_NOTAG; 717 if (type != P9_TVERSION) { 718 tag = p9_idpool_get(c->tagpool); 719 if (tag < 0) 720 return ERR_PTR(-ENOMEM); 721 } 722 723 req = p9_tag_alloc(c, tag, req_size); 724 if (IS_ERR(req)) 725 return req; 726 727 /* marshall the data */ 728 p9pdu_prepare(req->tc, tag, type); 729 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap); 730 if (err) 731 goto reterr; 732 p9pdu_finalize(c, req->tc); 733 trace_9p_client_req(c, type, tag); 734 return req; 735 reterr: 736 p9_free_req(c, req); 737 return ERR_PTR(err); 738 } 739 740 /** 741 * p9_client_rpc - issue a request and wait for a response 742 * @c: client session 743 * @type: type of request 744 * @fmt: protocol format string (see protocol.c) 745 * 746 * Returns request structure (which client must free using p9_free_req) 747 */ 748 749 static struct p9_req_t * 750 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 751 { 752 va_list ap; 753 int sigpending, err; 754 unsigned long flags; 755 struct p9_req_t *req; 756 757 va_start(ap, fmt); 758 req = p9_client_prepare_req(c, type, c->msize, fmt, ap); 759 va_end(ap); 760 if (IS_ERR(req)) 761 return req; 762 763 if (signal_pending(current)) { 764 sigpending = 1; 765 clear_thread_flag(TIF_SIGPENDING); 766 } else 767 sigpending = 0; 768 769 err = c->trans_mod->request(c, req); 770 if (err < 0) { 771 if (err != -ERESTARTSYS && err != -EFAULT) 772 c->status = Disconnected; 773 goto recalc_sigpending; 774 } 775 again: 776 /* Wait for the response */ 777 err = wait_event_killable(*req->wq, req->status >= REQ_STATUS_RCVD); 778 779 /* 780 * Make sure our req is coherent with regard to updates in other 781 * threads - echoes to wmb() in the callback 782 */ 783 smp_rmb(); 784 785 if ((err == -ERESTARTSYS) && (c->status == Connected) 786 && (type == P9_TFLUSH)) { 787 sigpending = 1; 788 clear_thread_flag(TIF_SIGPENDING); 789 goto again; 790 } 791 792 if (req->status == REQ_STATUS_ERROR) { 793 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 794 err = req->t_err; 795 } 796 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 797 p9_debug(P9_DEBUG_MUX, "flushing\n"); 798 sigpending = 1; 799 clear_thread_flag(TIF_SIGPENDING); 800 801 if (c->trans_mod->cancel(c, req)) 802 p9_client_flush(c, req); 803 804 /* if we received the response anyway, don't signal error */ 805 if (req->status == REQ_STATUS_RCVD) 806 err = 0; 807 } 808 recalc_sigpending: 809 if (sigpending) { 810 spin_lock_irqsave(¤t->sighand->siglock, flags); 811 recalc_sigpending(); 812 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 813 } 814 if (err < 0) 815 goto reterr; 816 817 err = p9_check_errors(c, req); 818 trace_9p_client_res(c, type, req->rc->tag, err); 819 if (!err) 820 return req; 821 reterr: 822 p9_free_req(c, req); 823 return ERR_PTR(safe_errno(err)); 824 } 825 826 /** 827 * p9_client_zc_rpc - issue a request and wait for a response 828 * @c: client session 829 * @type: type of request 830 * @uidata: destination for zero copy read 831 * @uodata: source for zero copy write 832 * @inlen: read buffer size 833 * @olen: write buffer size 834 * @hdrlen: reader header size, This is the size of response protocol data 835 * @fmt: protocol format string (see protocol.c) 836 * 837 * Returns request structure (which client must free using p9_free_req) 838 */ 839 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 840 struct iov_iter *uidata, 841 struct iov_iter *uodata, 842 int inlen, int olen, int in_hdrlen, 843 const char *fmt, ...) 844 { 845 va_list ap; 846 int sigpending, err; 847 unsigned long flags; 848 struct p9_req_t *req; 849 850 va_start(ap, fmt); 851 /* 852 * We allocate a inline protocol data of only 4k bytes. 853 * The actual content is passed in zero-copy fashion. 854 */ 855 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); 856 va_end(ap); 857 if (IS_ERR(req)) 858 return req; 859 860 if (signal_pending(current)) { 861 sigpending = 1; 862 clear_thread_flag(TIF_SIGPENDING); 863 } else 864 sigpending = 0; 865 866 err = c->trans_mod->zc_request(c, req, uidata, uodata, 867 inlen, olen, in_hdrlen); 868 if (err < 0) { 869 if (err == -EIO) 870 c->status = Disconnected; 871 if (err != -ERESTARTSYS) 872 goto recalc_sigpending; 873 } 874 if (req->status == REQ_STATUS_ERROR) { 875 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 876 err = req->t_err; 877 } 878 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 879 p9_debug(P9_DEBUG_MUX, "flushing\n"); 880 sigpending = 1; 881 clear_thread_flag(TIF_SIGPENDING); 882 883 if (c->trans_mod->cancel(c, req)) 884 p9_client_flush(c, req); 885 886 /* if we received the response anyway, don't signal error */ 887 if (req->status == REQ_STATUS_RCVD) 888 err = 0; 889 } 890 recalc_sigpending: 891 if (sigpending) { 892 spin_lock_irqsave(¤t->sighand->siglock, flags); 893 recalc_sigpending(); 894 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 895 } 896 if (err < 0) 897 goto reterr; 898 899 err = p9_check_zc_errors(c, req, uidata, in_hdrlen); 900 trace_9p_client_res(c, type, req->rc->tag, err); 901 if (!err) 902 return req; 903 reterr: 904 p9_free_req(c, req); 905 return ERR_PTR(safe_errno(err)); 906 } 907 908 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 909 { 910 int ret; 911 struct p9_fid *fid; 912 unsigned long flags; 913 914 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 915 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 916 if (!fid) 917 return ERR_PTR(-ENOMEM); 918 919 ret = p9_idpool_get(clnt->fidpool); 920 if (ret < 0) { 921 ret = -ENOSPC; 922 goto error; 923 } 924 fid->fid = ret; 925 926 memset(&fid->qid, 0, sizeof(struct p9_qid)); 927 fid->mode = -1; 928 fid->uid = current_fsuid(); 929 fid->clnt = clnt; 930 fid->rdir = NULL; 931 spin_lock_irqsave(&clnt->lock, flags); 932 list_add(&fid->flist, &clnt->fidlist); 933 spin_unlock_irqrestore(&clnt->lock, flags); 934 935 return fid; 936 937 error: 938 kfree(fid); 939 return ERR_PTR(ret); 940 } 941 942 static void p9_fid_destroy(struct p9_fid *fid) 943 { 944 struct p9_client *clnt; 945 unsigned long flags; 946 947 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 948 clnt = fid->clnt; 949 p9_idpool_put(fid->fid, clnt->fidpool); 950 spin_lock_irqsave(&clnt->lock, flags); 951 list_del(&fid->flist); 952 spin_unlock_irqrestore(&clnt->lock, flags); 953 kfree(fid->rdir); 954 kfree(fid); 955 } 956 957 static int p9_client_version(struct p9_client *c) 958 { 959 int err = 0; 960 struct p9_req_t *req; 961 char *version; 962 int msize; 963 964 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 965 c->msize, c->proto_version); 966 967 switch (c->proto_version) { 968 case p9_proto_2000L: 969 req = p9_client_rpc(c, P9_TVERSION, "ds", 970 c->msize, "9P2000.L"); 971 break; 972 case p9_proto_2000u: 973 req = p9_client_rpc(c, P9_TVERSION, "ds", 974 c->msize, "9P2000.u"); 975 break; 976 case p9_proto_legacy: 977 req = p9_client_rpc(c, P9_TVERSION, "ds", 978 c->msize, "9P2000"); 979 break; 980 default: 981 return -EINVAL; 982 } 983 984 if (IS_ERR(req)) 985 return PTR_ERR(req); 986 987 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version); 988 if (err) { 989 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 990 trace_9p_protocol_dump(c, req->rc); 991 goto error; 992 } 993 994 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 995 if (!strncmp(version, "9P2000.L", 8)) 996 c->proto_version = p9_proto_2000L; 997 else if (!strncmp(version, "9P2000.u", 8)) 998 c->proto_version = p9_proto_2000u; 999 else if (!strncmp(version, "9P2000", 6)) 1000 c->proto_version = p9_proto_legacy; 1001 else { 1002 err = -EREMOTEIO; 1003 goto error; 1004 } 1005 1006 if (msize < c->msize) 1007 c->msize = msize; 1008 1009 error: 1010 kfree(version); 1011 p9_free_req(c, req); 1012 1013 return err; 1014 } 1015 1016 struct p9_client *p9_client_create(const char *dev_name, char *options) 1017 { 1018 int err; 1019 struct p9_client *clnt; 1020 char *client_id; 1021 1022 err = 0; 1023 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 1024 if (!clnt) 1025 return ERR_PTR(-ENOMEM); 1026 1027 clnt->trans_mod = NULL; 1028 clnt->trans = NULL; 1029 1030 client_id = utsname()->nodename; 1031 memcpy(clnt->name, client_id, strlen(client_id) + 1); 1032 1033 spin_lock_init(&clnt->lock); 1034 INIT_LIST_HEAD(&clnt->fidlist); 1035 1036 err = p9_tag_init(clnt); 1037 if (err < 0) 1038 goto free_client; 1039 1040 err = parse_opts(options, clnt); 1041 if (err < 0) 1042 goto destroy_tagpool; 1043 1044 if (!clnt->trans_mod) 1045 clnt->trans_mod = v9fs_get_default_trans(); 1046 1047 if (clnt->trans_mod == NULL) { 1048 err = -EPROTONOSUPPORT; 1049 p9_debug(P9_DEBUG_ERROR, 1050 "No transport defined or default transport\n"); 1051 goto destroy_tagpool; 1052 } 1053 1054 clnt->fidpool = p9_idpool_create(); 1055 if (IS_ERR(clnt->fidpool)) { 1056 err = PTR_ERR(clnt->fidpool); 1057 goto put_trans; 1058 } 1059 1060 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1061 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1062 1063 err = clnt->trans_mod->create(clnt, dev_name, options); 1064 if (err) 1065 goto destroy_fidpool; 1066 1067 if (clnt->msize > clnt->trans_mod->maxsize) 1068 clnt->msize = clnt->trans_mod->maxsize; 1069 1070 err = p9_client_version(clnt); 1071 if (err) 1072 goto close_trans; 1073 1074 return clnt; 1075 1076 close_trans: 1077 clnt->trans_mod->close(clnt); 1078 destroy_fidpool: 1079 p9_idpool_destroy(clnt->fidpool); 1080 put_trans: 1081 v9fs_put_trans(clnt->trans_mod); 1082 destroy_tagpool: 1083 p9_idpool_destroy(clnt->tagpool); 1084 free_client: 1085 kfree(clnt); 1086 return ERR_PTR(err); 1087 } 1088 EXPORT_SYMBOL(p9_client_create); 1089 1090 void p9_client_destroy(struct p9_client *clnt) 1091 { 1092 struct p9_fid *fid, *fidptr; 1093 1094 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1095 1096 if (clnt->trans_mod) 1097 clnt->trans_mod->close(clnt); 1098 1099 v9fs_put_trans(clnt->trans_mod); 1100 1101 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) { 1102 pr_info("Found fid %d not clunked\n", fid->fid); 1103 p9_fid_destroy(fid); 1104 } 1105 1106 if (clnt->fidpool) 1107 p9_idpool_destroy(clnt->fidpool); 1108 1109 p9_tag_cleanup(clnt); 1110 1111 kfree(clnt); 1112 } 1113 EXPORT_SYMBOL(p9_client_destroy); 1114 1115 void p9_client_disconnect(struct p9_client *clnt) 1116 { 1117 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1118 clnt->status = Disconnected; 1119 } 1120 EXPORT_SYMBOL(p9_client_disconnect); 1121 1122 void p9_client_begin_disconnect(struct p9_client *clnt) 1123 { 1124 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1125 clnt->status = BeginDisconnect; 1126 } 1127 EXPORT_SYMBOL(p9_client_begin_disconnect); 1128 1129 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1130 const char *uname, kuid_t n_uname, const char *aname) 1131 { 1132 int err = 0; 1133 struct p9_req_t *req; 1134 struct p9_fid *fid; 1135 struct p9_qid qid; 1136 1137 1138 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1139 afid ? afid->fid : -1, uname, aname); 1140 fid = p9_fid_create(clnt); 1141 if (IS_ERR(fid)) { 1142 err = PTR_ERR(fid); 1143 fid = NULL; 1144 goto error; 1145 } 1146 fid->uid = n_uname; 1147 1148 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1149 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1150 if (IS_ERR(req)) { 1151 err = PTR_ERR(req); 1152 goto error; 1153 } 1154 1155 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid); 1156 if (err) { 1157 trace_9p_protocol_dump(clnt, req->rc); 1158 p9_free_req(clnt, req); 1159 goto error; 1160 } 1161 1162 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1163 qid.type, (unsigned long long)qid.path, qid.version); 1164 1165 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1166 1167 p9_free_req(clnt, req); 1168 return fid; 1169 1170 error: 1171 if (fid) 1172 p9_fid_destroy(fid); 1173 return ERR_PTR(err); 1174 } 1175 EXPORT_SYMBOL(p9_client_attach); 1176 1177 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1178 const unsigned char * const *wnames, int clone) 1179 { 1180 int err; 1181 struct p9_client *clnt; 1182 struct p9_fid *fid; 1183 struct p9_qid *wqids; 1184 struct p9_req_t *req; 1185 uint16_t nwqids, count; 1186 1187 err = 0; 1188 wqids = NULL; 1189 clnt = oldfid->clnt; 1190 if (clone) { 1191 fid = p9_fid_create(clnt); 1192 if (IS_ERR(fid)) { 1193 err = PTR_ERR(fid); 1194 fid = NULL; 1195 goto error; 1196 } 1197 1198 fid->uid = oldfid->uid; 1199 } else 1200 fid = oldfid; 1201 1202 1203 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1204 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1205 1206 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1207 nwname, wnames); 1208 if (IS_ERR(req)) { 1209 err = PTR_ERR(req); 1210 goto error; 1211 } 1212 1213 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1214 if (err) { 1215 trace_9p_protocol_dump(clnt, req->rc); 1216 p9_free_req(clnt, req); 1217 goto clunk_fid; 1218 } 1219 p9_free_req(clnt, req); 1220 1221 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1222 1223 if (nwqids != nwname) { 1224 err = -ENOENT; 1225 goto clunk_fid; 1226 } 1227 1228 for (count = 0; count < nwqids; count++) 1229 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1230 count, wqids[count].type, 1231 (unsigned long long)wqids[count].path, 1232 wqids[count].version); 1233 1234 if (nwname) 1235 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1236 else 1237 fid->qid = oldfid->qid; 1238 1239 kfree(wqids); 1240 return fid; 1241 1242 clunk_fid: 1243 kfree(wqids); 1244 p9_client_clunk(fid); 1245 fid = NULL; 1246 1247 error: 1248 if (fid && (fid != oldfid)) 1249 p9_fid_destroy(fid); 1250 1251 return ERR_PTR(err); 1252 } 1253 EXPORT_SYMBOL(p9_client_walk); 1254 1255 int p9_client_open(struct p9_fid *fid, int mode) 1256 { 1257 int err; 1258 struct p9_client *clnt; 1259 struct p9_req_t *req; 1260 struct p9_qid qid; 1261 int iounit; 1262 1263 clnt = fid->clnt; 1264 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1265 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1266 err = 0; 1267 1268 if (fid->mode != -1) 1269 return -EINVAL; 1270 1271 if (p9_is_proto_dotl(clnt)) 1272 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1273 else 1274 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1275 if (IS_ERR(req)) { 1276 err = PTR_ERR(req); 1277 goto error; 1278 } 1279 1280 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1281 if (err) { 1282 trace_9p_protocol_dump(clnt, req->rc); 1283 goto free_and_error; 1284 } 1285 1286 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1287 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1288 (unsigned long long)qid.path, qid.version, iounit); 1289 1290 fid->mode = mode; 1291 fid->iounit = iounit; 1292 1293 free_and_error: 1294 p9_free_req(clnt, req); 1295 error: 1296 return err; 1297 } 1298 EXPORT_SYMBOL(p9_client_open); 1299 1300 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode, 1301 kgid_t gid, struct p9_qid *qid) 1302 { 1303 int err = 0; 1304 struct p9_client *clnt; 1305 struct p9_req_t *req; 1306 int iounit; 1307 1308 p9_debug(P9_DEBUG_9P, 1309 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1310 ofid->fid, name, flags, mode, 1311 from_kgid(&init_user_ns, gid)); 1312 clnt = ofid->clnt; 1313 1314 if (ofid->mode != -1) 1315 return -EINVAL; 1316 1317 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1318 mode, gid); 1319 if (IS_ERR(req)) { 1320 err = PTR_ERR(req); 1321 goto error; 1322 } 1323 1324 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit); 1325 if (err) { 1326 trace_9p_protocol_dump(clnt, req->rc); 1327 goto free_and_error; 1328 } 1329 1330 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1331 qid->type, 1332 (unsigned long long)qid->path, 1333 qid->version, iounit); 1334 1335 ofid->mode = mode; 1336 ofid->iounit = iounit; 1337 1338 free_and_error: 1339 p9_free_req(clnt, req); 1340 error: 1341 return err; 1342 } 1343 EXPORT_SYMBOL(p9_client_create_dotl); 1344 1345 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1346 char *extension) 1347 { 1348 int err; 1349 struct p9_client *clnt; 1350 struct p9_req_t *req; 1351 struct p9_qid qid; 1352 int iounit; 1353 1354 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1355 fid->fid, name, perm, mode); 1356 err = 0; 1357 clnt = fid->clnt; 1358 1359 if (fid->mode != -1) 1360 return -EINVAL; 1361 1362 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1363 mode, extension); 1364 if (IS_ERR(req)) { 1365 err = PTR_ERR(req); 1366 goto error; 1367 } 1368 1369 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1370 if (err) { 1371 trace_9p_protocol_dump(clnt, req->rc); 1372 goto free_and_error; 1373 } 1374 1375 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1376 qid.type, 1377 (unsigned long long)qid.path, 1378 qid.version, iounit); 1379 1380 fid->mode = mode; 1381 fid->iounit = iounit; 1382 1383 free_and_error: 1384 p9_free_req(clnt, req); 1385 error: 1386 return err; 1387 } 1388 EXPORT_SYMBOL(p9_client_fcreate); 1389 1390 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1391 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1392 { 1393 int err = 0; 1394 struct p9_client *clnt; 1395 struct p9_req_t *req; 1396 1397 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1398 dfid->fid, name, symtgt); 1399 clnt = dfid->clnt; 1400 1401 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1402 gid); 1403 if (IS_ERR(req)) { 1404 err = PTR_ERR(req); 1405 goto error; 1406 } 1407 1408 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1409 if (err) { 1410 trace_9p_protocol_dump(clnt, req->rc); 1411 goto free_and_error; 1412 } 1413 1414 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1415 qid->type, (unsigned long long)qid->path, qid->version); 1416 1417 free_and_error: 1418 p9_free_req(clnt, req); 1419 error: 1420 return err; 1421 } 1422 EXPORT_SYMBOL(p9_client_symlink); 1423 1424 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1425 { 1426 struct p9_client *clnt; 1427 struct p9_req_t *req; 1428 1429 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1430 dfid->fid, oldfid->fid, newname); 1431 clnt = dfid->clnt; 1432 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1433 newname); 1434 if (IS_ERR(req)) 1435 return PTR_ERR(req); 1436 1437 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1438 p9_free_req(clnt, req); 1439 return 0; 1440 } 1441 EXPORT_SYMBOL(p9_client_link); 1442 1443 int p9_client_fsync(struct p9_fid *fid, int datasync) 1444 { 1445 int err; 1446 struct p9_client *clnt; 1447 struct p9_req_t *req; 1448 1449 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1450 fid->fid, datasync); 1451 err = 0; 1452 clnt = fid->clnt; 1453 1454 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1455 if (IS_ERR(req)) { 1456 err = PTR_ERR(req); 1457 goto error; 1458 } 1459 1460 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1461 1462 p9_free_req(clnt, req); 1463 1464 error: 1465 return err; 1466 } 1467 EXPORT_SYMBOL(p9_client_fsync); 1468 1469 int p9_client_clunk(struct p9_fid *fid) 1470 { 1471 int err; 1472 struct p9_client *clnt; 1473 struct p9_req_t *req; 1474 int retries = 0; 1475 1476 if (!fid) { 1477 pr_warn("%s (%d): Trying to clunk with NULL fid\n", 1478 __func__, task_pid_nr(current)); 1479 dump_stack(); 1480 return 0; 1481 } 1482 1483 again: 1484 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid, 1485 retries); 1486 err = 0; 1487 clnt = fid->clnt; 1488 1489 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1490 if (IS_ERR(req)) { 1491 err = PTR_ERR(req); 1492 goto error; 1493 } 1494 1495 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1496 1497 p9_free_req(clnt, req); 1498 error: 1499 /* 1500 * Fid is not valid even after a failed clunk 1501 * If interrupted, retry once then give up and 1502 * leak fid until umount. 1503 */ 1504 if (err == -ERESTARTSYS) { 1505 if (retries++ == 0) 1506 goto again; 1507 } else 1508 p9_fid_destroy(fid); 1509 return err; 1510 } 1511 EXPORT_SYMBOL(p9_client_clunk); 1512 1513 int p9_client_remove(struct p9_fid *fid) 1514 { 1515 int err; 1516 struct p9_client *clnt; 1517 struct p9_req_t *req; 1518 1519 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1520 err = 0; 1521 clnt = fid->clnt; 1522 1523 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1524 if (IS_ERR(req)) { 1525 err = PTR_ERR(req); 1526 goto error; 1527 } 1528 1529 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1530 1531 p9_free_req(clnt, req); 1532 error: 1533 if (err == -ERESTARTSYS) 1534 p9_client_clunk(fid); 1535 else 1536 p9_fid_destroy(fid); 1537 return err; 1538 } 1539 EXPORT_SYMBOL(p9_client_remove); 1540 1541 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1542 { 1543 int err = 0; 1544 struct p9_req_t *req; 1545 struct p9_client *clnt; 1546 1547 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1548 dfid->fid, name, flags); 1549 1550 clnt = dfid->clnt; 1551 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1552 if (IS_ERR(req)) { 1553 err = PTR_ERR(req); 1554 goto error; 1555 } 1556 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1557 1558 p9_free_req(clnt, req); 1559 error: 1560 return err; 1561 } 1562 EXPORT_SYMBOL(p9_client_unlinkat); 1563 1564 int 1565 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1566 { 1567 struct p9_client *clnt = fid->clnt; 1568 struct p9_req_t *req; 1569 int total = 0; 1570 *err = 0; 1571 1572 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", 1573 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to)); 1574 1575 while (iov_iter_count(to)) { 1576 int count = iov_iter_count(to); 1577 int rsize, non_zc = 0; 1578 char *dataptr; 1579 1580 rsize = fid->iounit; 1581 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1582 rsize = clnt->msize - P9_IOHDRSZ; 1583 1584 if (count < rsize) 1585 rsize = count; 1586 1587 /* Don't bother zerocopy for small IO (< 1024) */ 1588 if (clnt->trans_mod->zc_request && rsize > 1024) { 1589 /* 1590 * response header len is 11 1591 * PDU Header(7) + IO Size (4) 1592 */ 1593 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1594 0, 11, "dqd", fid->fid, 1595 offset, rsize); 1596 } else { 1597 non_zc = 1; 1598 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1599 rsize); 1600 } 1601 if (IS_ERR(req)) { 1602 *err = PTR_ERR(req); 1603 break; 1604 } 1605 1606 *err = p9pdu_readf(req->rc, clnt->proto_version, 1607 "D", &count, &dataptr); 1608 if (*err) { 1609 trace_9p_protocol_dump(clnt, req->rc); 1610 p9_free_req(clnt, req); 1611 break; 1612 } 1613 if (rsize < count) { 1614 pr_err("bogus RREAD count (%d > %d)\n", count, rsize); 1615 count = rsize; 1616 } 1617 1618 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1619 if (!count) { 1620 p9_free_req(clnt, req); 1621 break; 1622 } 1623 1624 if (non_zc) { 1625 int n = copy_to_iter(dataptr, count, to); 1626 total += n; 1627 offset += n; 1628 if (n != count) { 1629 *err = -EFAULT; 1630 p9_free_req(clnt, req); 1631 break; 1632 } 1633 } else { 1634 iov_iter_advance(to, count); 1635 total += count; 1636 offset += count; 1637 } 1638 p9_free_req(clnt, req); 1639 } 1640 return total; 1641 } 1642 EXPORT_SYMBOL(p9_client_read); 1643 1644 int 1645 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1646 { 1647 struct p9_client *clnt = fid->clnt; 1648 struct p9_req_t *req; 1649 int total = 0; 1650 *err = 0; 1651 1652 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", 1653 fid->fid, (unsigned long long) offset, 1654 iov_iter_count(from)); 1655 1656 while (iov_iter_count(from)) { 1657 int count = iov_iter_count(from); 1658 int rsize = fid->iounit; 1659 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1660 rsize = clnt->msize - P9_IOHDRSZ; 1661 1662 if (count < rsize) 1663 rsize = count; 1664 1665 /* Don't bother zerocopy for small IO (< 1024) */ 1666 if (clnt->trans_mod->zc_request && rsize > 1024) { 1667 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1668 rsize, P9_ZC_HDR_SZ, "dqd", 1669 fid->fid, offset, rsize); 1670 } else { 1671 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1672 offset, rsize, from); 1673 } 1674 if (IS_ERR(req)) { 1675 *err = PTR_ERR(req); 1676 break; 1677 } 1678 1679 *err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count); 1680 if (*err) { 1681 trace_9p_protocol_dump(clnt, req->rc); 1682 p9_free_req(clnt, req); 1683 break; 1684 } 1685 if (rsize < count) { 1686 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize); 1687 count = rsize; 1688 } 1689 1690 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1691 1692 p9_free_req(clnt, req); 1693 iov_iter_advance(from, count); 1694 total += count; 1695 offset += count; 1696 } 1697 return total; 1698 } 1699 EXPORT_SYMBOL(p9_client_write); 1700 1701 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1702 { 1703 int err; 1704 struct p9_client *clnt; 1705 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1706 struct p9_req_t *req; 1707 u16 ignored; 1708 1709 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1710 1711 if (!ret) 1712 return ERR_PTR(-ENOMEM); 1713 1714 err = 0; 1715 clnt = fid->clnt; 1716 1717 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1718 if (IS_ERR(req)) { 1719 err = PTR_ERR(req); 1720 goto error; 1721 } 1722 1723 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret); 1724 if (err) { 1725 trace_9p_protocol_dump(clnt, req->rc); 1726 p9_free_req(clnt, req); 1727 goto error; 1728 } 1729 1730 p9_debug(P9_DEBUG_9P, 1731 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1732 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1733 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1734 "<<< uid=%d gid=%d n_muid=%d\n", 1735 ret->size, ret->type, ret->dev, ret->qid.type, 1736 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1737 ret->atime, ret->mtime, (unsigned long long)ret->length, 1738 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1739 from_kuid(&init_user_ns, ret->n_uid), 1740 from_kgid(&init_user_ns, ret->n_gid), 1741 from_kuid(&init_user_ns, ret->n_muid)); 1742 1743 p9_free_req(clnt, req); 1744 return ret; 1745 1746 error: 1747 kfree(ret); 1748 return ERR_PTR(err); 1749 } 1750 EXPORT_SYMBOL(p9_client_stat); 1751 1752 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1753 u64 request_mask) 1754 { 1755 int err; 1756 struct p9_client *clnt; 1757 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1758 GFP_KERNEL); 1759 struct p9_req_t *req; 1760 1761 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1762 fid->fid, request_mask); 1763 1764 if (!ret) 1765 return ERR_PTR(-ENOMEM); 1766 1767 err = 0; 1768 clnt = fid->clnt; 1769 1770 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1771 if (IS_ERR(req)) { 1772 err = PTR_ERR(req); 1773 goto error; 1774 } 1775 1776 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret); 1777 if (err) { 1778 trace_9p_protocol_dump(clnt, req->rc); 1779 p9_free_req(clnt, req); 1780 goto error; 1781 } 1782 1783 p9_debug(P9_DEBUG_9P, 1784 "<<< RGETATTR st_result_mask=%lld\n" 1785 "<<< qid=%x.%llx.%x\n" 1786 "<<< st_mode=%8.8x st_nlink=%llu\n" 1787 "<<< st_uid=%d st_gid=%d\n" 1788 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1789 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1790 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1791 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1792 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1793 "<<< st_gen=%lld st_data_version=%lld", 1794 ret->st_result_mask, ret->qid.type, ret->qid.path, 1795 ret->qid.version, ret->st_mode, ret->st_nlink, 1796 from_kuid(&init_user_ns, ret->st_uid), 1797 from_kgid(&init_user_ns, ret->st_gid), 1798 ret->st_rdev, ret->st_size, ret->st_blksize, 1799 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1800 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1801 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1802 ret->st_gen, ret->st_data_version); 1803 1804 p9_free_req(clnt, req); 1805 return ret; 1806 1807 error: 1808 kfree(ret); 1809 return ERR_PTR(err); 1810 } 1811 EXPORT_SYMBOL(p9_client_getattr_dotl); 1812 1813 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1814 { 1815 int ret; 1816 1817 /* NOTE: size shouldn't include its own length */ 1818 /* size[2] type[2] dev[4] qid[13] */ 1819 /* mode[4] atime[4] mtime[4] length[8]*/ 1820 /* name[s] uid[s] gid[s] muid[s] */ 1821 ret = 2+4+13+4+4+4+8+2+2+2+2; 1822 1823 if (wst->name) 1824 ret += strlen(wst->name); 1825 if (wst->uid) 1826 ret += strlen(wst->uid); 1827 if (wst->gid) 1828 ret += strlen(wst->gid); 1829 if (wst->muid) 1830 ret += strlen(wst->muid); 1831 1832 if ((proto_version == p9_proto_2000u) || 1833 (proto_version == p9_proto_2000L)) { 1834 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1835 if (wst->extension) 1836 ret += strlen(wst->extension); 1837 } 1838 1839 return ret; 1840 } 1841 1842 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1843 { 1844 int err; 1845 struct p9_req_t *req; 1846 struct p9_client *clnt; 1847 1848 err = 0; 1849 clnt = fid->clnt; 1850 wst->size = p9_client_statsize(wst, clnt->proto_version); 1851 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1852 p9_debug(P9_DEBUG_9P, 1853 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1854 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1855 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1856 " uid=%d gid=%d n_muid=%d\n", 1857 wst->size, wst->type, wst->dev, wst->qid.type, 1858 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1859 wst->atime, wst->mtime, (unsigned long long)wst->length, 1860 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1861 from_kuid(&init_user_ns, wst->n_uid), 1862 from_kgid(&init_user_ns, wst->n_gid), 1863 from_kuid(&init_user_ns, wst->n_muid)); 1864 1865 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1866 if (IS_ERR(req)) { 1867 err = PTR_ERR(req); 1868 goto error; 1869 } 1870 1871 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1872 1873 p9_free_req(clnt, req); 1874 error: 1875 return err; 1876 } 1877 EXPORT_SYMBOL(p9_client_wstat); 1878 1879 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1880 { 1881 int err; 1882 struct p9_req_t *req; 1883 struct p9_client *clnt; 1884 1885 err = 0; 1886 clnt = fid->clnt; 1887 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1888 p9_debug(P9_DEBUG_9P, 1889 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1890 " atime_sec=%lld atime_nsec=%lld\n" 1891 " mtime_sec=%lld mtime_nsec=%lld\n", 1892 p9attr->valid, p9attr->mode, 1893 from_kuid(&init_user_ns, p9attr->uid), 1894 from_kgid(&init_user_ns, p9attr->gid), 1895 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1896 p9attr->mtime_sec, p9attr->mtime_nsec); 1897 1898 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1899 1900 if (IS_ERR(req)) { 1901 err = PTR_ERR(req); 1902 goto error; 1903 } 1904 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1905 p9_free_req(clnt, req); 1906 error: 1907 return err; 1908 } 1909 EXPORT_SYMBOL(p9_client_setattr); 1910 1911 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1912 { 1913 int err; 1914 struct p9_req_t *req; 1915 struct p9_client *clnt; 1916 1917 err = 0; 1918 clnt = fid->clnt; 1919 1920 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1921 1922 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1923 if (IS_ERR(req)) { 1924 err = PTR_ERR(req); 1925 goto error; 1926 } 1927 1928 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1929 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1930 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1931 if (err) { 1932 trace_9p_protocol_dump(clnt, req->rc); 1933 p9_free_req(clnt, req); 1934 goto error; 1935 } 1936 1937 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1938 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1939 "fsid %llu namelen %ld\n", 1940 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1941 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1942 sb->fsid, (long int)sb->namelen); 1943 1944 p9_free_req(clnt, req); 1945 error: 1946 return err; 1947 } 1948 EXPORT_SYMBOL(p9_client_statfs); 1949 1950 int p9_client_rename(struct p9_fid *fid, 1951 struct p9_fid *newdirfid, const char *name) 1952 { 1953 int err; 1954 struct p9_req_t *req; 1955 struct p9_client *clnt; 1956 1957 err = 0; 1958 clnt = fid->clnt; 1959 1960 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1961 fid->fid, newdirfid->fid, name); 1962 1963 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1964 newdirfid->fid, name); 1965 if (IS_ERR(req)) { 1966 err = PTR_ERR(req); 1967 goto error; 1968 } 1969 1970 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1971 1972 p9_free_req(clnt, req); 1973 error: 1974 return err; 1975 } 1976 EXPORT_SYMBOL(p9_client_rename); 1977 1978 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1979 struct p9_fid *newdirfid, const char *new_name) 1980 { 1981 int err; 1982 struct p9_req_t *req; 1983 struct p9_client *clnt; 1984 1985 err = 0; 1986 clnt = olddirfid->clnt; 1987 1988 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" 1989 " newdirfid %d new name %s\n", olddirfid->fid, old_name, 1990 newdirfid->fid, new_name); 1991 1992 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1993 old_name, newdirfid->fid, new_name); 1994 if (IS_ERR(req)) { 1995 err = PTR_ERR(req); 1996 goto error; 1997 } 1998 1999 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 2000 newdirfid->fid, new_name); 2001 2002 p9_free_req(clnt, req); 2003 error: 2004 return err; 2005 } 2006 EXPORT_SYMBOL(p9_client_renameat); 2007 2008 /* 2009 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 2010 */ 2011 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 2012 const char *attr_name, u64 *attr_size) 2013 { 2014 int err; 2015 struct p9_req_t *req; 2016 struct p9_client *clnt; 2017 struct p9_fid *attr_fid; 2018 2019 err = 0; 2020 clnt = file_fid->clnt; 2021 attr_fid = p9_fid_create(clnt); 2022 if (IS_ERR(attr_fid)) { 2023 err = PTR_ERR(attr_fid); 2024 attr_fid = NULL; 2025 goto error; 2026 } 2027 p9_debug(P9_DEBUG_9P, 2028 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 2029 file_fid->fid, attr_fid->fid, attr_name); 2030 2031 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 2032 file_fid->fid, attr_fid->fid, attr_name); 2033 if (IS_ERR(req)) { 2034 err = PTR_ERR(req); 2035 goto error; 2036 } 2037 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size); 2038 if (err) { 2039 trace_9p_protocol_dump(clnt, req->rc); 2040 p9_free_req(clnt, req); 2041 goto clunk_fid; 2042 } 2043 p9_free_req(clnt, req); 2044 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2045 attr_fid->fid, *attr_size); 2046 return attr_fid; 2047 clunk_fid: 2048 p9_client_clunk(attr_fid); 2049 attr_fid = NULL; 2050 error: 2051 if (attr_fid && (attr_fid != file_fid)) 2052 p9_fid_destroy(attr_fid); 2053 2054 return ERR_PTR(err); 2055 } 2056 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2057 2058 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2059 u64 attr_size, int flags) 2060 { 2061 int err; 2062 struct p9_req_t *req; 2063 struct p9_client *clnt; 2064 2065 p9_debug(P9_DEBUG_9P, 2066 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 2067 fid->fid, name, (long long)attr_size, flags); 2068 err = 0; 2069 clnt = fid->clnt; 2070 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2071 fid->fid, name, attr_size, flags); 2072 if (IS_ERR(req)) { 2073 err = PTR_ERR(req); 2074 goto error; 2075 } 2076 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2077 p9_free_req(clnt, req); 2078 error: 2079 return err; 2080 } 2081 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2082 2083 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2084 { 2085 int err, rsize, non_zc = 0; 2086 struct p9_client *clnt; 2087 struct p9_req_t *req; 2088 char *dataptr; 2089 struct kvec kv = {.iov_base = data, .iov_len = count}; 2090 struct iov_iter to; 2091 2092 iov_iter_kvec(&to, READ | ITER_KVEC, &kv, 1, count); 2093 2094 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2095 fid->fid, (unsigned long long) offset, count); 2096 2097 err = 0; 2098 clnt = fid->clnt; 2099 2100 rsize = fid->iounit; 2101 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 2102 rsize = clnt->msize - P9_READDIRHDRSZ; 2103 2104 if (count < rsize) 2105 rsize = count; 2106 2107 /* Don't bother zerocopy for small IO (< 1024) */ 2108 if (clnt->trans_mod->zc_request && rsize > 1024) { 2109 /* 2110 * response header len is 11 2111 * PDU Header(7) + IO Size (4) 2112 */ 2113 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2114 11, "dqd", fid->fid, offset, rsize); 2115 } else { 2116 non_zc = 1; 2117 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2118 offset, rsize); 2119 } 2120 if (IS_ERR(req)) { 2121 err = PTR_ERR(req); 2122 goto error; 2123 } 2124 2125 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 2126 if (err) { 2127 trace_9p_protocol_dump(clnt, req->rc); 2128 goto free_and_error; 2129 } 2130 if (rsize < count) { 2131 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2132 count = rsize; 2133 } 2134 2135 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2136 2137 if (non_zc) 2138 memmove(data, dataptr, count); 2139 2140 p9_free_req(clnt, req); 2141 return count; 2142 2143 free_and_error: 2144 p9_free_req(clnt, req); 2145 error: 2146 return err; 2147 } 2148 EXPORT_SYMBOL(p9_client_readdir); 2149 2150 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2151 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2152 { 2153 int err; 2154 struct p9_client *clnt; 2155 struct p9_req_t *req; 2156 2157 err = 0; 2158 clnt = fid->clnt; 2159 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 2160 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2161 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2162 MAJOR(rdev), MINOR(rdev), gid); 2163 if (IS_ERR(req)) 2164 return PTR_ERR(req); 2165 2166 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 2167 if (err) { 2168 trace_9p_protocol_dump(clnt, req->rc); 2169 goto error; 2170 } 2171 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 2172 (unsigned long long)qid->path, qid->version); 2173 2174 error: 2175 p9_free_req(clnt, req); 2176 return err; 2177 2178 } 2179 EXPORT_SYMBOL(p9_client_mknod_dotl); 2180 2181 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2182 kgid_t gid, struct p9_qid *qid) 2183 { 2184 int err; 2185 struct p9_client *clnt; 2186 struct p9_req_t *req; 2187 2188 err = 0; 2189 clnt = fid->clnt; 2190 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2191 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2192 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode, 2193 gid); 2194 if (IS_ERR(req)) 2195 return PTR_ERR(req); 2196 2197 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 2198 if (err) { 2199 trace_9p_protocol_dump(clnt, req->rc); 2200 goto error; 2201 } 2202 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2203 (unsigned long long)qid->path, qid->version); 2204 2205 error: 2206 p9_free_req(clnt, req); 2207 return err; 2208 2209 } 2210 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2211 2212 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2213 { 2214 int err; 2215 struct p9_client *clnt; 2216 struct p9_req_t *req; 2217 2218 err = 0; 2219 clnt = fid->clnt; 2220 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " 2221 "start %lld length %lld proc_id %d client_id %s\n", 2222 fid->fid, flock->type, flock->flags, flock->start, 2223 flock->length, flock->proc_id, flock->client_id); 2224 2225 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2226 flock->flags, flock->start, flock->length, 2227 flock->proc_id, flock->client_id); 2228 2229 if (IS_ERR(req)) 2230 return PTR_ERR(req); 2231 2232 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status); 2233 if (err) { 2234 trace_9p_protocol_dump(clnt, req->rc); 2235 goto error; 2236 } 2237 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2238 error: 2239 p9_free_req(clnt, req); 2240 return err; 2241 2242 } 2243 EXPORT_SYMBOL(p9_client_lock_dotl); 2244 2245 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2246 { 2247 int err; 2248 struct p9_client *clnt; 2249 struct p9_req_t *req; 2250 2251 err = 0; 2252 clnt = fid->clnt; 2253 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " 2254 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, 2255 glock->start, glock->length, glock->proc_id, glock->client_id); 2256 2257 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, 2258 glock->start, glock->length, glock->proc_id, glock->client_id); 2259 2260 if (IS_ERR(req)) 2261 return PTR_ERR(req); 2262 2263 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type, 2264 &glock->start, &glock->length, &glock->proc_id, 2265 &glock->client_id); 2266 if (err) { 2267 trace_9p_protocol_dump(clnt, req->rc); 2268 goto error; 2269 } 2270 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " 2271 "proc_id %d client_id %s\n", glock->type, glock->start, 2272 glock->length, glock->proc_id, glock->client_id); 2273 error: 2274 p9_free_req(clnt, req); 2275 return err; 2276 } 2277 EXPORT_SYMBOL(p9_client_getlock_dotl); 2278 2279 int p9_client_readlink(struct p9_fid *fid, char **target) 2280 { 2281 int err; 2282 struct p9_client *clnt; 2283 struct p9_req_t *req; 2284 2285 err = 0; 2286 clnt = fid->clnt; 2287 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2288 2289 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2290 if (IS_ERR(req)) 2291 return PTR_ERR(req); 2292 2293 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target); 2294 if (err) { 2295 trace_9p_protocol_dump(clnt, req->rc); 2296 goto error; 2297 } 2298 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2299 error: 2300 p9_free_req(clnt, req); 2301 return err; 2302 } 2303 EXPORT_SYMBOL(p9_client_readlink); 2304