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 v9fs_put_trans(clnt->trans_mod); 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 recalc_sigpending; 773 } 774 again: 775 /* Wait for the response */ 776 err = wait_event_killable(*req->wq, req->status >= REQ_STATUS_RCVD); 777 778 /* 779 * Make sure our req is coherent with regard to updates in other 780 * threads - echoes to wmb() in the callback 781 */ 782 smp_rmb(); 783 784 if ((err == -ERESTARTSYS) && (c->status == Connected) 785 && (type == P9_TFLUSH)) { 786 sigpending = 1; 787 clear_thread_flag(TIF_SIGPENDING); 788 goto again; 789 } 790 791 if (req->status == REQ_STATUS_ERROR) { 792 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 793 err = req->t_err; 794 } 795 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 796 p9_debug(P9_DEBUG_MUX, "flushing\n"); 797 sigpending = 1; 798 clear_thread_flag(TIF_SIGPENDING); 799 800 if (c->trans_mod->cancel(c, req)) 801 p9_client_flush(c, req); 802 803 /* if we received the response anyway, don't signal error */ 804 if (req->status == REQ_STATUS_RCVD) 805 err = 0; 806 } 807 recalc_sigpending: 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 recalc_sigpending; 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 recalc_sigpending: 890 if (sigpending) { 891 spin_lock_irqsave(¤t->sighand->siglock, flags); 892 recalc_sigpending(); 893 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 894 } 895 if (err < 0) 896 goto reterr; 897 898 err = p9_check_zc_errors(c, req, uidata, in_hdrlen); 899 trace_9p_client_res(c, type, req->rc->tag, err); 900 if (!err) 901 return req; 902 reterr: 903 p9_free_req(c, req); 904 return ERR_PTR(safe_errno(err)); 905 } 906 907 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 908 { 909 int ret; 910 struct p9_fid *fid; 911 unsigned long flags; 912 913 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 914 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 915 if (!fid) 916 return ERR_PTR(-ENOMEM); 917 918 ret = p9_idpool_get(clnt->fidpool); 919 if (ret < 0) { 920 ret = -ENOSPC; 921 goto error; 922 } 923 fid->fid = ret; 924 925 memset(&fid->qid, 0, sizeof(struct p9_qid)); 926 fid->mode = -1; 927 fid->uid = current_fsuid(); 928 fid->clnt = clnt; 929 fid->rdir = NULL; 930 spin_lock_irqsave(&clnt->lock, flags); 931 list_add(&fid->flist, &clnt->fidlist); 932 spin_unlock_irqrestore(&clnt->lock, flags); 933 934 return fid; 935 936 error: 937 kfree(fid); 938 return ERR_PTR(ret); 939 } 940 941 static void p9_fid_destroy(struct p9_fid *fid) 942 { 943 struct p9_client *clnt; 944 unsigned long flags; 945 946 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 947 clnt = fid->clnt; 948 p9_idpool_put(fid->fid, clnt->fidpool); 949 spin_lock_irqsave(&clnt->lock, flags); 950 list_del(&fid->flist); 951 spin_unlock_irqrestore(&clnt->lock, flags); 952 kfree(fid->rdir); 953 kfree(fid); 954 } 955 956 static int p9_client_version(struct p9_client *c) 957 { 958 int err = 0; 959 struct p9_req_t *req; 960 char *version; 961 int msize; 962 963 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 964 c->msize, c->proto_version); 965 966 switch (c->proto_version) { 967 case p9_proto_2000L: 968 req = p9_client_rpc(c, P9_TVERSION, "ds", 969 c->msize, "9P2000.L"); 970 break; 971 case p9_proto_2000u: 972 req = p9_client_rpc(c, P9_TVERSION, "ds", 973 c->msize, "9P2000.u"); 974 break; 975 case p9_proto_legacy: 976 req = p9_client_rpc(c, P9_TVERSION, "ds", 977 c->msize, "9P2000"); 978 break; 979 default: 980 return -EINVAL; 981 } 982 983 if (IS_ERR(req)) 984 return PTR_ERR(req); 985 986 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version); 987 if (err) { 988 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 989 trace_9p_protocol_dump(c, req->rc); 990 goto error; 991 } 992 993 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 994 if (!strncmp(version, "9P2000.L", 8)) 995 c->proto_version = p9_proto_2000L; 996 else if (!strncmp(version, "9P2000.u", 8)) 997 c->proto_version = p9_proto_2000u; 998 else if (!strncmp(version, "9P2000", 6)) 999 c->proto_version = p9_proto_legacy; 1000 else { 1001 err = -EREMOTEIO; 1002 goto error; 1003 } 1004 1005 if (msize < c->msize) 1006 c->msize = msize; 1007 1008 error: 1009 kfree(version); 1010 p9_free_req(c, req); 1011 1012 return err; 1013 } 1014 1015 struct p9_client *p9_client_create(const char *dev_name, char *options) 1016 { 1017 int err; 1018 struct p9_client *clnt; 1019 char *client_id; 1020 1021 err = 0; 1022 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 1023 if (!clnt) 1024 return ERR_PTR(-ENOMEM); 1025 1026 clnt->trans_mod = NULL; 1027 clnt->trans = NULL; 1028 1029 client_id = utsname()->nodename; 1030 memcpy(clnt->name, client_id, strlen(client_id) + 1); 1031 1032 spin_lock_init(&clnt->lock); 1033 INIT_LIST_HEAD(&clnt->fidlist); 1034 1035 err = p9_tag_init(clnt); 1036 if (err < 0) 1037 goto free_client; 1038 1039 err = parse_opts(options, clnt); 1040 if (err < 0) 1041 goto destroy_tagpool; 1042 1043 if (!clnt->trans_mod) 1044 clnt->trans_mod = v9fs_get_default_trans(); 1045 1046 if (clnt->trans_mod == NULL) { 1047 err = -EPROTONOSUPPORT; 1048 p9_debug(P9_DEBUG_ERROR, 1049 "No transport defined or default transport\n"); 1050 goto destroy_tagpool; 1051 } 1052 1053 clnt->fidpool = p9_idpool_create(); 1054 if (IS_ERR(clnt->fidpool)) { 1055 err = PTR_ERR(clnt->fidpool); 1056 goto put_trans; 1057 } 1058 1059 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1060 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1061 1062 err = clnt->trans_mod->create(clnt, dev_name, options); 1063 if (err) 1064 goto destroy_fidpool; 1065 1066 if (clnt->msize > clnt->trans_mod->maxsize) 1067 clnt->msize = clnt->trans_mod->maxsize; 1068 1069 err = p9_client_version(clnt); 1070 if (err) 1071 goto close_trans; 1072 1073 return clnt; 1074 1075 close_trans: 1076 clnt->trans_mod->close(clnt); 1077 destroy_fidpool: 1078 p9_idpool_destroy(clnt->fidpool); 1079 put_trans: 1080 v9fs_put_trans(clnt->trans_mod); 1081 destroy_tagpool: 1082 p9_idpool_destroy(clnt->tagpool); 1083 free_client: 1084 kfree(clnt); 1085 return ERR_PTR(err); 1086 } 1087 EXPORT_SYMBOL(p9_client_create); 1088 1089 void p9_client_destroy(struct p9_client *clnt) 1090 { 1091 struct p9_fid *fid, *fidptr; 1092 1093 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1094 1095 if (clnt->trans_mod) 1096 clnt->trans_mod->close(clnt); 1097 1098 v9fs_put_trans(clnt->trans_mod); 1099 1100 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) { 1101 pr_info("Found fid %d not clunked\n", fid->fid); 1102 p9_fid_destroy(fid); 1103 } 1104 1105 if (clnt->fidpool) 1106 p9_idpool_destroy(clnt->fidpool); 1107 1108 p9_tag_cleanup(clnt); 1109 1110 kfree(clnt); 1111 } 1112 EXPORT_SYMBOL(p9_client_destroy); 1113 1114 void p9_client_disconnect(struct p9_client *clnt) 1115 { 1116 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1117 clnt->status = Disconnected; 1118 } 1119 EXPORT_SYMBOL(p9_client_disconnect); 1120 1121 void p9_client_begin_disconnect(struct p9_client *clnt) 1122 { 1123 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1124 clnt->status = BeginDisconnect; 1125 } 1126 EXPORT_SYMBOL(p9_client_begin_disconnect); 1127 1128 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1129 const char *uname, kuid_t n_uname, const char *aname) 1130 { 1131 int err = 0; 1132 struct p9_req_t *req; 1133 struct p9_fid *fid; 1134 struct p9_qid qid; 1135 1136 1137 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1138 afid ? afid->fid : -1, uname, aname); 1139 fid = p9_fid_create(clnt); 1140 if (IS_ERR(fid)) { 1141 err = PTR_ERR(fid); 1142 fid = NULL; 1143 goto error; 1144 } 1145 fid->uid = n_uname; 1146 1147 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1148 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1149 if (IS_ERR(req)) { 1150 err = PTR_ERR(req); 1151 goto error; 1152 } 1153 1154 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid); 1155 if (err) { 1156 trace_9p_protocol_dump(clnt, req->rc); 1157 p9_free_req(clnt, req); 1158 goto error; 1159 } 1160 1161 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1162 qid.type, (unsigned long long)qid.path, qid.version); 1163 1164 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1165 1166 p9_free_req(clnt, req); 1167 return fid; 1168 1169 error: 1170 if (fid) 1171 p9_fid_destroy(fid); 1172 return ERR_PTR(err); 1173 } 1174 EXPORT_SYMBOL(p9_client_attach); 1175 1176 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1177 const unsigned char * const *wnames, int clone) 1178 { 1179 int err; 1180 struct p9_client *clnt; 1181 struct p9_fid *fid; 1182 struct p9_qid *wqids; 1183 struct p9_req_t *req; 1184 uint16_t nwqids, count; 1185 1186 err = 0; 1187 wqids = NULL; 1188 clnt = oldfid->clnt; 1189 if (clone) { 1190 fid = p9_fid_create(clnt); 1191 if (IS_ERR(fid)) { 1192 err = PTR_ERR(fid); 1193 fid = NULL; 1194 goto error; 1195 } 1196 1197 fid->uid = oldfid->uid; 1198 } else 1199 fid = oldfid; 1200 1201 1202 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1203 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1204 1205 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1206 nwname, wnames); 1207 if (IS_ERR(req)) { 1208 err = PTR_ERR(req); 1209 goto error; 1210 } 1211 1212 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1213 if (err) { 1214 trace_9p_protocol_dump(clnt, req->rc); 1215 p9_free_req(clnt, req); 1216 goto clunk_fid; 1217 } 1218 p9_free_req(clnt, req); 1219 1220 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1221 1222 if (nwqids != nwname) { 1223 err = -ENOENT; 1224 goto clunk_fid; 1225 } 1226 1227 for (count = 0; count < nwqids; count++) 1228 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1229 count, wqids[count].type, 1230 (unsigned long long)wqids[count].path, 1231 wqids[count].version); 1232 1233 if (nwname) 1234 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1235 else 1236 fid->qid = oldfid->qid; 1237 1238 kfree(wqids); 1239 return fid; 1240 1241 clunk_fid: 1242 kfree(wqids); 1243 p9_client_clunk(fid); 1244 fid = NULL; 1245 1246 error: 1247 if (fid && (fid != oldfid)) 1248 p9_fid_destroy(fid); 1249 1250 return ERR_PTR(err); 1251 } 1252 EXPORT_SYMBOL(p9_client_walk); 1253 1254 int p9_client_open(struct p9_fid *fid, int mode) 1255 { 1256 int err; 1257 struct p9_client *clnt; 1258 struct p9_req_t *req; 1259 struct p9_qid qid; 1260 int iounit; 1261 1262 clnt = fid->clnt; 1263 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1264 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1265 err = 0; 1266 1267 if (fid->mode != -1) 1268 return -EINVAL; 1269 1270 if (p9_is_proto_dotl(clnt)) 1271 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1272 else 1273 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1274 if (IS_ERR(req)) { 1275 err = PTR_ERR(req); 1276 goto error; 1277 } 1278 1279 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1280 if (err) { 1281 trace_9p_protocol_dump(clnt, req->rc); 1282 goto free_and_error; 1283 } 1284 1285 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1286 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1287 (unsigned long long)qid.path, qid.version, iounit); 1288 1289 fid->mode = mode; 1290 fid->iounit = iounit; 1291 1292 free_and_error: 1293 p9_free_req(clnt, req); 1294 error: 1295 return err; 1296 } 1297 EXPORT_SYMBOL(p9_client_open); 1298 1299 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode, 1300 kgid_t gid, struct p9_qid *qid) 1301 { 1302 int err = 0; 1303 struct p9_client *clnt; 1304 struct p9_req_t *req; 1305 int iounit; 1306 1307 p9_debug(P9_DEBUG_9P, 1308 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1309 ofid->fid, name, flags, mode, 1310 from_kgid(&init_user_ns, gid)); 1311 clnt = ofid->clnt; 1312 1313 if (ofid->mode != -1) 1314 return -EINVAL; 1315 1316 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1317 mode, gid); 1318 if (IS_ERR(req)) { 1319 err = PTR_ERR(req); 1320 goto error; 1321 } 1322 1323 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit); 1324 if (err) { 1325 trace_9p_protocol_dump(clnt, req->rc); 1326 goto free_and_error; 1327 } 1328 1329 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1330 qid->type, 1331 (unsigned long long)qid->path, 1332 qid->version, iounit); 1333 1334 ofid->mode = mode; 1335 ofid->iounit = iounit; 1336 1337 free_and_error: 1338 p9_free_req(clnt, req); 1339 error: 1340 return err; 1341 } 1342 EXPORT_SYMBOL(p9_client_create_dotl); 1343 1344 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1345 char *extension) 1346 { 1347 int err; 1348 struct p9_client *clnt; 1349 struct p9_req_t *req; 1350 struct p9_qid qid; 1351 int iounit; 1352 1353 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1354 fid->fid, name, perm, mode); 1355 err = 0; 1356 clnt = fid->clnt; 1357 1358 if (fid->mode != -1) 1359 return -EINVAL; 1360 1361 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1362 mode, extension); 1363 if (IS_ERR(req)) { 1364 err = PTR_ERR(req); 1365 goto error; 1366 } 1367 1368 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1369 if (err) { 1370 trace_9p_protocol_dump(clnt, req->rc); 1371 goto free_and_error; 1372 } 1373 1374 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1375 qid.type, 1376 (unsigned long long)qid.path, 1377 qid.version, iounit); 1378 1379 fid->mode = mode; 1380 fid->iounit = iounit; 1381 1382 free_and_error: 1383 p9_free_req(clnt, req); 1384 error: 1385 return err; 1386 } 1387 EXPORT_SYMBOL(p9_client_fcreate); 1388 1389 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1390 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1391 { 1392 int err = 0; 1393 struct p9_client *clnt; 1394 struct p9_req_t *req; 1395 1396 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1397 dfid->fid, name, symtgt); 1398 clnt = dfid->clnt; 1399 1400 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1401 gid); 1402 if (IS_ERR(req)) { 1403 err = PTR_ERR(req); 1404 goto error; 1405 } 1406 1407 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1408 if (err) { 1409 trace_9p_protocol_dump(clnt, req->rc); 1410 goto free_and_error; 1411 } 1412 1413 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1414 qid->type, (unsigned long long)qid->path, qid->version); 1415 1416 free_and_error: 1417 p9_free_req(clnt, req); 1418 error: 1419 return err; 1420 } 1421 EXPORT_SYMBOL(p9_client_symlink); 1422 1423 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1424 { 1425 struct p9_client *clnt; 1426 struct p9_req_t *req; 1427 1428 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1429 dfid->fid, oldfid->fid, newname); 1430 clnt = dfid->clnt; 1431 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1432 newname); 1433 if (IS_ERR(req)) 1434 return PTR_ERR(req); 1435 1436 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1437 p9_free_req(clnt, req); 1438 return 0; 1439 } 1440 EXPORT_SYMBOL(p9_client_link); 1441 1442 int p9_client_fsync(struct p9_fid *fid, int datasync) 1443 { 1444 int err; 1445 struct p9_client *clnt; 1446 struct p9_req_t *req; 1447 1448 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1449 fid->fid, datasync); 1450 err = 0; 1451 clnt = fid->clnt; 1452 1453 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1454 if (IS_ERR(req)) { 1455 err = PTR_ERR(req); 1456 goto error; 1457 } 1458 1459 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1460 1461 p9_free_req(clnt, req); 1462 1463 error: 1464 return err; 1465 } 1466 EXPORT_SYMBOL(p9_client_fsync); 1467 1468 int p9_client_clunk(struct p9_fid *fid) 1469 { 1470 int err; 1471 struct p9_client *clnt; 1472 struct p9_req_t *req; 1473 int retries = 0; 1474 1475 if (!fid) { 1476 pr_warn("%s (%d): Trying to clunk with NULL fid\n", 1477 __func__, task_pid_nr(current)); 1478 dump_stack(); 1479 return 0; 1480 } 1481 1482 again: 1483 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid, 1484 retries); 1485 err = 0; 1486 clnt = fid->clnt; 1487 1488 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1489 if (IS_ERR(req)) { 1490 err = PTR_ERR(req); 1491 goto error; 1492 } 1493 1494 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1495 1496 p9_free_req(clnt, req); 1497 error: 1498 /* 1499 * Fid is not valid even after a failed clunk 1500 * If interrupted, retry once then give up and 1501 * leak fid until umount. 1502 */ 1503 if (err == -ERESTARTSYS) { 1504 if (retries++ == 0) 1505 goto again; 1506 } else 1507 p9_fid_destroy(fid); 1508 return err; 1509 } 1510 EXPORT_SYMBOL(p9_client_clunk); 1511 1512 int p9_client_remove(struct p9_fid *fid) 1513 { 1514 int err; 1515 struct p9_client *clnt; 1516 struct p9_req_t *req; 1517 1518 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1519 err = 0; 1520 clnt = fid->clnt; 1521 1522 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1523 if (IS_ERR(req)) { 1524 err = PTR_ERR(req); 1525 goto error; 1526 } 1527 1528 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1529 1530 p9_free_req(clnt, req); 1531 error: 1532 if (err == -ERESTARTSYS) 1533 p9_client_clunk(fid); 1534 else 1535 p9_fid_destroy(fid); 1536 return err; 1537 } 1538 EXPORT_SYMBOL(p9_client_remove); 1539 1540 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1541 { 1542 int err = 0; 1543 struct p9_req_t *req; 1544 struct p9_client *clnt; 1545 1546 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1547 dfid->fid, name, flags); 1548 1549 clnt = dfid->clnt; 1550 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1551 if (IS_ERR(req)) { 1552 err = PTR_ERR(req); 1553 goto error; 1554 } 1555 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1556 1557 p9_free_req(clnt, req); 1558 error: 1559 return err; 1560 } 1561 EXPORT_SYMBOL(p9_client_unlinkat); 1562 1563 int 1564 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1565 { 1566 struct p9_client *clnt = fid->clnt; 1567 struct p9_req_t *req; 1568 int total = 0; 1569 *err = 0; 1570 1571 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", 1572 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to)); 1573 1574 while (iov_iter_count(to)) { 1575 int count = iov_iter_count(to); 1576 int rsize, non_zc = 0; 1577 char *dataptr; 1578 1579 rsize = fid->iounit; 1580 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1581 rsize = clnt->msize - P9_IOHDRSZ; 1582 1583 if (count < rsize) 1584 rsize = count; 1585 1586 /* Don't bother zerocopy for small IO (< 1024) */ 1587 if (clnt->trans_mod->zc_request && rsize > 1024) { 1588 /* 1589 * response header len is 11 1590 * PDU Header(7) + IO Size (4) 1591 */ 1592 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1593 0, 11, "dqd", fid->fid, 1594 offset, rsize); 1595 } else { 1596 non_zc = 1; 1597 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1598 rsize); 1599 } 1600 if (IS_ERR(req)) { 1601 *err = PTR_ERR(req); 1602 break; 1603 } 1604 1605 *err = p9pdu_readf(req->rc, clnt->proto_version, 1606 "D", &count, &dataptr); 1607 if (*err) { 1608 trace_9p_protocol_dump(clnt, req->rc); 1609 p9_free_req(clnt, req); 1610 break; 1611 } 1612 if (rsize < count) { 1613 pr_err("bogus RREAD count (%d > %d)\n", count, rsize); 1614 count = rsize; 1615 } 1616 1617 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1618 if (!count) { 1619 p9_free_req(clnt, req); 1620 break; 1621 } 1622 1623 if (non_zc) { 1624 int n = copy_to_iter(dataptr, count, to); 1625 total += n; 1626 offset += n; 1627 if (n != count) { 1628 *err = -EFAULT; 1629 p9_free_req(clnt, req); 1630 break; 1631 } 1632 } else { 1633 iov_iter_advance(to, count); 1634 total += count; 1635 offset += count; 1636 } 1637 p9_free_req(clnt, req); 1638 } 1639 return total; 1640 } 1641 EXPORT_SYMBOL(p9_client_read); 1642 1643 int 1644 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1645 { 1646 struct p9_client *clnt = fid->clnt; 1647 struct p9_req_t *req; 1648 int total = 0; 1649 *err = 0; 1650 1651 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", 1652 fid->fid, (unsigned long long) offset, 1653 iov_iter_count(from)); 1654 1655 while (iov_iter_count(from)) { 1656 int count = iov_iter_count(from); 1657 int rsize = fid->iounit; 1658 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1659 rsize = clnt->msize - P9_IOHDRSZ; 1660 1661 if (count < rsize) 1662 rsize = count; 1663 1664 /* Don't bother zerocopy for small IO (< 1024) */ 1665 if (clnt->trans_mod->zc_request && rsize > 1024) { 1666 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1667 rsize, P9_ZC_HDR_SZ, "dqd", 1668 fid->fid, offset, rsize); 1669 } else { 1670 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1671 offset, rsize, from); 1672 } 1673 if (IS_ERR(req)) { 1674 *err = PTR_ERR(req); 1675 break; 1676 } 1677 1678 *err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count); 1679 if (*err) { 1680 trace_9p_protocol_dump(clnt, req->rc); 1681 p9_free_req(clnt, req); 1682 break; 1683 } 1684 if (rsize < count) { 1685 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize); 1686 count = rsize; 1687 } 1688 1689 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1690 1691 p9_free_req(clnt, req); 1692 iov_iter_advance(from, count); 1693 total += count; 1694 offset += count; 1695 } 1696 return total; 1697 } 1698 EXPORT_SYMBOL(p9_client_write); 1699 1700 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1701 { 1702 int err; 1703 struct p9_client *clnt; 1704 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1705 struct p9_req_t *req; 1706 u16 ignored; 1707 1708 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1709 1710 if (!ret) 1711 return ERR_PTR(-ENOMEM); 1712 1713 err = 0; 1714 clnt = fid->clnt; 1715 1716 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1717 if (IS_ERR(req)) { 1718 err = PTR_ERR(req); 1719 goto error; 1720 } 1721 1722 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret); 1723 if (err) { 1724 trace_9p_protocol_dump(clnt, req->rc); 1725 p9_free_req(clnt, req); 1726 goto error; 1727 } 1728 1729 p9_debug(P9_DEBUG_9P, 1730 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1731 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1732 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1733 "<<< uid=%d gid=%d n_muid=%d\n", 1734 ret->size, ret->type, ret->dev, ret->qid.type, 1735 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1736 ret->atime, ret->mtime, (unsigned long long)ret->length, 1737 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1738 from_kuid(&init_user_ns, ret->n_uid), 1739 from_kgid(&init_user_ns, ret->n_gid), 1740 from_kuid(&init_user_ns, ret->n_muid)); 1741 1742 p9_free_req(clnt, req); 1743 return ret; 1744 1745 error: 1746 kfree(ret); 1747 return ERR_PTR(err); 1748 } 1749 EXPORT_SYMBOL(p9_client_stat); 1750 1751 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1752 u64 request_mask) 1753 { 1754 int err; 1755 struct p9_client *clnt; 1756 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1757 GFP_KERNEL); 1758 struct p9_req_t *req; 1759 1760 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1761 fid->fid, request_mask); 1762 1763 if (!ret) 1764 return ERR_PTR(-ENOMEM); 1765 1766 err = 0; 1767 clnt = fid->clnt; 1768 1769 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1770 if (IS_ERR(req)) { 1771 err = PTR_ERR(req); 1772 goto error; 1773 } 1774 1775 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret); 1776 if (err) { 1777 trace_9p_protocol_dump(clnt, req->rc); 1778 p9_free_req(clnt, req); 1779 goto error; 1780 } 1781 1782 p9_debug(P9_DEBUG_9P, 1783 "<<< RGETATTR st_result_mask=%lld\n" 1784 "<<< qid=%x.%llx.%x\n" 1785 "<<< st_mode=%8.8x st_nlink=%llu\n" 1786 "<<< st_uid=%d st_gid=%d\n" 1787 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1788 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1789 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1790 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1791 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1792 "<<< st_gen=%lld st_data_version=%lld", 1793 ret->st_result_mask, ret->qid.type, ret->qid.path, 1794 ret->qid.version, ret->st_mode, ret->st_nlink, 1795 from_kuid(&init_user_ns, ret->st_uid), 1796 from_kgid(&init_user_ns, ret->st_gid), 1797 ret->st_rdev, ret->st_size, ret->st_blksize, 1798 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1799 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1800 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1801 ret->st_gen, ret->st_data_version); 1802 1803 p9_free_req(clnt, req); 1804 return ret; 1805 1806 error: 1807 kfree(ret); 1808 return ERR_PTR(err); 1809 } 1810 EXPORT_SYMBOL(p9_client_getattr_dotl); 1811 1812 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1813 { 1814 int ret; 1815 1816 /* NOTE: size shouldn't include its own length */ 1817 /* size[2] type[2] dev[4] qid[13] */ 1818 /* mode[4] atime[4] mtime[4] length[8]*/ 1819 /* name[s] uid[s] gid[s] muid[s] */ 1820 ret = 2+4+13+4+4+4+8+2+2+2+2; 1821 1822 if (wst->name) 1823 ret += strlen(wst->name); 1824 if (wst->uid) 1825 ret += strlen(wst->uid); 1826 if (wst->gid) 1827 ret += strlen(wst->gid); 1828 if (wst->muid) 1829 ret += strlen(wst->muid); 1830 1831 if ((proto_version == p9_proto_2000u) || 1832 (proto_version == p9_proto_2000L)) { 1833 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1834 if (wst->extension) 1835 ret += strlen(wst->extension); 1836 } 1837 1838 return ret; 1839 } 1840 1841 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1842 { 1843 int err; 1844 struct p9_req_t *req; 1845 struct p9_client *clnt; 1846 1847 err = 0; 1848 clnt = fid->clnt; 1849 wst->size = p9_client_statsize(wst, clnt->proto_version); 1850 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1851 p9_debug(P9_DEBUG_9P, 1852 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1853 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1854 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1855 " uid=%d gid=%d n_muid=%d\n", 1856 wst->size, wst->type, wst->dev, wst->qid.type, 1857 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1858 wst->atime, wst->mtime, (unsigned long long)wst->length, 1859 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1860 from_kuid(&init_user_ns, wst->n_uid), 1861 from_kgid(&init_user_ns, wst->n_gid), 1862 from_kuid(&init_user_ns, wst->n_muid)); 1863 1864 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1865 if (IS_ERR(req)) { 1866 err = PTR_ERR(req); 1867 goto error; 1868 } 1869 1870 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1871 1872 p9_free_req(clnt, req); 1873 error: 1874 return err; 1875 } 1876 EXPORT_SYMBOL(p9_client_wstat); 1877 1878 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1879 { 1880 int err; 1881 struct p9_req_t *req; 1882 struct p9_client *clnt; 1883 1884 err = 0; 1885 clnt = fid->clnt; 1886 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1887 p9_debug(P9_DEBUG_9P, 1888 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1889 " atime_sec=%lld atime_nsec=%lld\n" 1890 " mtime_sec=%lld mtime_nsec=%lld\n", 1891 p9attr->valid, p9attr->mode, 1892 from_kuid(&init_user_ns, p9attr->uid), 1893 from_kgid(&init_user_ns, p9attr->gid), 1894 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1895 p9attr->mtime_sec, p9attr->mtime_nsec); 1896 1897 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1898 1899 if (IS_ERR(req)) { 1900 err = PTR_ERR(req); 1901 goto error; 1902 } 1903 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1904 p9_free_req(clnt, req); 1905 error: 1906 return err; 1907 } 1908 EXPORT_SYMBOL(p9_client_setattr); 1909 1910 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1911 { 1912 int err; 1913 struct p9_req_t *req; 1914 struct p9_client *clnt; 1915 1916 err = 0; 1917 clnt = fid->clnt; 1918 1919 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1920 1921 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1922 if (IS_ERR(req)) { 1923 err = PTR_ERR(req); 1924 goto error; 1925 } 1926 1927 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1928 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1929 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1930 if (err) { 1931 trace_9p_protocol_dump(clnt, req->rc); 1932 p9_free_req(clnt, req); 1933 goto error; 1934 } 1935 1936 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1937 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1938 "fsid %llu namelen %ld\n", 1939 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1940 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1941 sb->fsid, (long int)sb->namelen); 1942 1943 p9_free_req(clnt, req); 1944 error: 1945 return err; 1946 } 1947 EXPORT_SYMBOL(p9_client_statfs); 1948 1949 int p9_client_rename(struct p9_fid *fid, 1950 struct p9_fid *newdirfid, const char *name) 1951 { 1952 int err; 1953 struct p9_req_t *req; 1954 struct p9_client *clnt; 1955 1956 err = 0; 1957 clnt = fid->clnt; 1958 1959 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1960 fid->fid, newdirfid->fid, name); 1961 1962 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1963 newdirfid->fid, name); 1964 if (IS_ERR(req)) { 1965 err = PTR_ERR(req); 1966 goto error; 1967 } 1968 1969 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1970 1971 p9_free_req(clnt, req); 1972 error: 1973 return err; 1974 } 1975 EXPORT_SYMBOL(p9_client_rename); 1976 1977 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1978 struct p9_fid *newdirfid, const char *new_name) 1979 { 1980 int err; 1981 struct p9_req_t *req; 1982 struct p9_client *clnt; 1983 1984 err = 0; 1985 clnt = olddirfid->clnt; 1986 1987 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" 1988 " newdirfid %d new name %s\n", olddirfid->fid, old_name, 1989 newdirfid->fid, new_name); 1990 1991 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1992 old_name, newdirfid->fid, new_name); 1993 if (IS_ERR(req)) { 1994 err = PTR_ERR(req); 1995 goto error; 1996 } 1997 1998 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1999 newdirfid->fid, new_name); 2000 2001 p9_free_req(clnt, req); 2002 error: 2003 return err; 2004 } 2005 EXPORT_SYMBOL(p9_client_renameat); 2006 2007 /* 2008 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 2009 */ 2010 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 2011 const char *attr_name, u64 *attr_size) 2012 { 2013 int err; 2014 struct p9_req_t *req; 2015 struct p9_client *clnt; 2016 struct p9_fid *attr_fid; 2017 2018 err = 0; 2019 clnt = file_fid->clnt; 2020 attr_fid = p9_fid_create(clnt); 2021 if (IS_ERR(attr_fid)) { 2022 err = PTR_ERR(attr_fid); 2023 attr_fid = NULL; 2024 goto error; 2025 } 2026 p9_debug(P9_DEBUG_9P, 2027 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 2028 file_fid->fid, attr_fid->fid, attr_name); 2029 2030 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 2031 file_fid->fid, attr_fid->fid, attr_name); 2032 if (IS_ERR(req)) { 2033 err = PTR_ERR(req); 2034 goto error; 2035 } 2036 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size); 2037 if (err) { 2038 trace_9p_protocol_dump(clnt, req->rc); 2039 p9_free_req(clnt, req); 2040 goto clunk_fid; 2041 } 2042 p9_free_req(clnt, req); 2043 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2044 attr_fid->fid, *attr_size); 2045 return attr_fid; 2046 clunk_fid: 2047 p9_client_clunk(attr_fid); 2048 attr_fid = NULL; 2049 error: 2050 if (attr_fid && (attr_fid != file_fid)) 2051 p9_fid_destroy(attr_fid); 2052 2053 return ERR_PTR(err); 2054 } 2055 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2056 2057 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2058 u64 attr_size, int flags) 2059 { 2060 int err; 2061 struct p9_req_t *req; 2062 struct p9_client *clnt; 2063 2064 p9_debug(P9_DEBUG_9P, 2065 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 2066 fid->fid, name, (long long)attr_size, flags); 2067 err = 0; 2068 clnt = fid->clnt; 2069 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2070 fid->fid, name, attr_size, flags); 2071 if (IS_ERR(req)) { 2072 err = PTR_ERR(req); 2073 goto error; 2074 } 2075 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2076 p9_free_req(clnt, req); 2077 error: 2078 return err; 2079 } 2080 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2081 2082 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2083 { 2084 int err, rsize, non_zc = 0; 2085 struct p9_client *clnt; 2086 struct p9_req_t *req; 2087 char *dataptr; 2088 struct kvec kv = {.iov_base = data, .iov_len = count}; 2089 struct iov_iter to; 2090 2091 iov_iter_kvec(&to, READ | ITER_KVEC, &kv, 1, count); 2092 2093 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2094 fid->fid, (unsigned long long) offset, count); 2095 2096 err = 0; 2097 clnt = fid->clnt; 2098 2099 rsize = fid->iounit; 2100 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 2101 rsize = clnt->msize - P9_READDIRHDRSZ; 2102 2103 if (count < rsize) 2104 rsize = count; 2105 2106 /* Don't bother zerocopy for small IO (< 1024) */ 2107 if (clnt->trans_mod->zc_request && rsize > 1024) { 2108 /* 2109 * response header len is 11 2110 * PDU Header(7) + IO Size (4) 2111 */ 2112 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2113 11, "dqd", fid->fid, offset, rsize); 2114 } else { 2115 non_zc = 1; 2116 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2117 offset, rsize); 2118 } 2119 if (IS_ERR(req)) { 2120 err = PTR_ERR(req); 2121 goto error; 2122 } 2123 2124 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 2125 if (err) { 2126 trace_9p_protocol_dump(clnt, req->rc); 2127 goto free_and_error; 2128 } 2129 if (rsize < count) { 2130 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2131 count = rsize; 2132 } 2133 2134 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2135 2136 if (non_zc) 2137 memmove(data, dataptr, count); 2138 2139 p9_free_req(clnt, req); 2140 return count; 2141 2142 free_and_error: 2143 p9_free_req(clnt, req); 2144 error: 2145 return err; 2146 } 2147 EXPORT_SYMBOL(p9_client_readdir); 2148 2149 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2150 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2151 { 2152 int err; 2153 struct p9_client *clnt; 2154 struct p9_req_t *req; 2155 2156 err = 0; 2157 clnt = fid->clnt; 2158 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 2159 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2160 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2161 MAJOR(rdev), MINOR(rdev), gid); 2162 if (IS_ERR(req)) 2163 return PTR_ERR(req); 2164 2165 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 2166 if (err) { 2167 trace_9p_protocol_dump(clnt, req->rc); 2168 goto error; 2169 } 2170 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 2171 (unsigned long long)qid->path, qid->version); 2172 2173 error: 2174 p9_free_req(clnt, req); 2175 return err; 2176 2177 } 2178 EXPORT_SYMBOL(p9_client_mknod_dotl); 2179 2180 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2181 kgid_t gid, struct p9_qid *qid) 2182 { 2183 int err; 2184 struct p9_client *clnt; 2185 struct p9_req_t *req; 2186 2187 err = 0; 2188 clnt = fid->clnt; 2189 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2190 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2191 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode, 2192 gid); 2193 if (IS_ERR(req)) 2194 return PTR_ERR(req); 2195 2196 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 2197 if (err) { 2198 trace_9p_protocol_dump(clnt, req->rc); 2199 goto error; 2200 } 2201 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2202 (unsigned long long)qid->path, qid->version); 2203 2204 error: 2205 p9_free_req(clnt, req); 2206 return err; 2207 2208 } 2209 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2210 2211 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2212 { 2213 int err; 2214 struct p9_client *clnt; 2215 struct p9_req_t *req; 2216 2217 err = 0; 2218 clnt = fid->clnt; 2219 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " 2220 "start %lld length %lld proc_id %d client_id %s\n", 2221 fid->fid, flock->type, flock->flags, flock->start, 2222 flock->length, flock->proc_id, flock->client_id); 2223 2224 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2225 flock->flags, flock->start, flock->length, 2226 flock->proc_id, flock->client_id); 2227 2228 if (IS_ERR(req)) 2229 return PTR_ERR(req); 2230 2231 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status); 2232 if (err) { 2233 trace_9p_protocol_dump(clnt, req->rc); 2234 goto error; 2235 } 2236 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2237 error: 2238 p9_free_req(clnt, req); 2239 return err; 2240 2241 } 2242 EXPORT_SYMBOL(p9_client_lock_dotl); 2243 2244 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2245 { 2246 int err; 2247 struct p9_client *clnt; 2248 struct p9_req_t *req; 2249 2250 err = 0; 2251 clnt = fid->clnt; 2252 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " 2253 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, 2254 glock->start, glock->length, glock->proc_id, glock->client_id); 2255 2256 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, 2257 glock->start, glock->length, glock->proc_id, glock->client_id); 2258 2259 if (IS_ERR(req)) 2260 return PTR_ERR(req); 2261 2262 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type, 2263 &glock->start, &glock->length, &glock->proc_id, 2264 &glock->client_id); 2265 if (err) { 2266 trace_9p_protocol_dump(clnt, req->rc); 2267 goto error; 2268 } 2269 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " 2270 "proc_id %d client_id %s\n", glock->type, glock->start, 2271 glock->length, glock->proc_id, glock->client_id); 2272 error: 2273 p9_free_req(clnt, req); 2274 return err; 2275 } 2276 EXPORT_SYMBOL(p9_client_getlock_dotl); 2277 2278 int p9_client_readlink(struct p9_fid *fid, char **target) 2279 { 2280 int err; 2281 struct p9_client *clnt; 2282 struct p9_req_t *req; 2283 2284 err = 0; 2285 clnt = fid->clnt; 2286 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2287 2288 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2289 if (IS_ERR(req)) 2290 return PTR_ERR(req); 2291 2292 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target); 2293 if (err) { 2294 trace_9p_protocol_dump(clnt, req->rc); 2295 goto error; 2296 } 2297 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2298 error: 2299 p9_free_req(clnt, req); 2300 return err; 2301 } 2302 EXPORT_SYMBOL(p9_client_readlink); 2303