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