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 #include <linux/module.h> 27 #include <linux/errno.h> 28 #include <linux/fs.h> 29 #include <linux/poll.h> 30 #include <linux/idr.h> 31 #include <linux/mutex.h> 32 #include <linux/slab.h> 33 #include <linux/sched.h> 34 #include <linux/uaccess.h> 35 #include <net/9p/9p.h> 36 #include <linux/parser.h> 37 #include <net/9p/client.h> 38 #include <net/9p/transport.h> 39 #include "protocol.h" 40 41 #define CREATE_TRACE_POINTS 42 #include <trace/events/9p.h> 43 44 /* 45 * Client Option Parsing (code inspired by NFS code) 46 * - a little lazy - parse all client options 47 */ 48 49 enum { 50 Opt_msize, 51 Opt_trans, 52 Opt_legacy, 53 Opt_version, 54 Opt_err, 55 }; 56 57 static const match_table_t tokens = { 58 {Opt_msize, "msize=%u"}, 59 {Opt_legacy, "noextend"}, 60 {Opt_trans, "trans=%s"}, 61 {Opt_version, "version=%s"}, 62 {Opt_err, NULL}, 63 }; 64 65 inline int p9_is_proto_dotl(struct p9_client *clnt) 66 { 67 return clnt->proto_version == p9_proto_2000L; 68 } 69 EXPORT_SYMBOL(p9_is_proto_dotl); 70 71 inline int p9_is_proto_dotu(struct p9_client *clnt) 72 { 73 return clnt->proto_version == p9_proto_2000u; 74 } 75 EXPORT_SYMBOL(p9_is_proto_dotu); 76 77 /* Interpret mount option for protocol version */ 78 static int get_protocol_version(char *s) 79 { 80 int version = -EINVAL; 81 82 if (!strcmp(s, "9p2000")) { 83 version = p9_proto_legacy; 84 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: Legacy\n"); 85 } else if (!strcmp(s, "9p2000.u")) { 86 version = p9_proto_2000u; 87 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); 88 } else if (!strcmp(s, "9p2000.L")) { 89 version = p9_proto_2000L; 90 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); 91 } else 92 printk(KERN_INFO "9p: Unknown protocol version %s.\n", s); 93 94 return version; 95 } 96 97 /** 98 * parse_options - parse mount options into client structure 99 * @opts: options string passed from mount 100 * @clnt: existing v9fs client information 101 * 102 * Return 0 upon success, -ERRNO upon failure 103 */ 104 105 static int parse_opts(char *opts, struct p9_client *clnt) 106 { 107 char *options, *tmp_options; 108 char *p; 109 substring_t args[MAX_OPT_ARGS]; 110 int option; 111 char *s; 112 int ret = 0; 113 114 clnt->proto_version = p9_proto_2000u; 115 clnt->msize = 8192; 116 117 if (!opts) 118 return 0; 119 120 tmp_options = kstrdup(opts, GFP_KERNEL); 121 if (!tmp_options) { 122 P9_DPRINTK(P9_DEBUG_ERROR, 123 "failed to allocate copy of option string\n"); 124 return -ENOMEM; 125 } 126 options = tmp_options; 127 128 while ((p = strsep(&options, ",")) != NULL) { 129 int token, r; 130 if (!*p) 131 continue; 132 token = match_token(p, tokens, args); 133 switch (token) { 134 case Opt_msize: 135 r = match_int(&args[0], &option); 136 if (r < 0) { 137 P9_DPRINTK(P9_DEBUG_ERROR, 138 "integer field, but no integer?\n"); 139 ret = r; 140 continue; 141 } 142 clnt->msize = option; 143 break; 144 case Opt_trans: 145 s = match_strdup(&args[0]); 146 if (!s) { 147 ret = -ENOMEM; 148 P9_DPRINTK(P9_DEBUG_ERROR, 149 "problem allocating copy of trans arg\n"); 150 goto free_and_return; 151 } 152 clnt->trans_mod = v9fs_get_trans_by_name(s); 153 if (clnt->trans_mod == NULL) { 154 printk(KERN_INFO 155 "9p: Could not find " 156 "request transport: %s\n", s); 157 ret = -EINVAL; 158 kfree(s); 159 goto free_and_return; 160 } 161 kfree(s); 162 break; 163 case Opt_legacy: 164 clnt->proto_version = p9_proto_legacy; 165 break; 166 case Opt_version: 167 s = match_strdup(&args[0]); 168 if (!s) { 169 ret = -ENOMEM; 170 P9_DPRINTK(P9_DEBUG_ERROR, 171 "problem allocating copy of version arg\n"); 172 goto free_and_return; 173 } 174 ret = get_protocol_version(s); 175 if (ret == -EINVAL) { 176 kfree(s); 177 goto free_and_return; 178 } 179 kfree(s); 180 clnt->proto_version = ret; 181 break; 182 default: 183 continue; 184 } 185 } 186 187 free_and_return: 188 kfree(tmp_options); 189 return ret; 190 } 191 192 /** 193 * p9_tag_alloc - lookup/allocate a request by tag 194 * @c: client session to lookup tag within 195 * @tag: numeric id for transaction 196 * 197 * this is a simple array lookup, but will grow the 198 * request_slots as necessary to accommodate transaction 199 * ids which did not previously have a slot. 200 * 201 * this code relies on the client spinlock to manage locks, its 202 * possible we should switch to something else, but I'd rather 203 * stick with something low-overhead for the common case. 204 * 205 */ 206 207 static struct p9_req_t * 208 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size) 209 { 210 unsigned long flags; 211 int row, col; 212 struct p9_req_t *req; 213 int alloc_msize = min(c->msize, max_size); 214 215 /* This looks up the original request by tag so we know which 216 * buffer to read the data into */ 217 tag++; 218 219 if (tag >= c->max_tag) { 220 spin_lock_irqsave(&c->lock, flags); 221 /* check again since original check was outside of lock */ 222 while (tag >= c->max_tag) { 223 row = (tag / P9_ROW_MAXTAG); 224 c->reqs[row] = kcalloc(P9_ROW_MAXTAG, 225 sizeof(struct p9_req_t), GFP_ATOMIC); 226 227 if (!c->reqs[row]) { 228 printk(KERN_ERR "Couldn't grow tag array\n"); 229 spin_unlock_irqrestore(&c->lock, flags); 230 return ERR_PTR(-ENOMEM); 231 } 232 for (col = 0; col < P9_ROW_MAXTAG; col++) { 233 c->reqs[row][col].status = REQ_STATUS_IDLE; 234 c->reqs[row][col].tc = NULL; 235 } 236 c->max_tag += P9_ROW_MAXTAG; 237 } 238 spin_unlock_irqrestore(&c->lock, flags); 239 } 240 row = tag / P9_ROW_MAXTAG; 241 col = tag % P9_ROW_MAXTAG; 242 243 req = &c->reqs[row][col]; 244 if (!req->tc) { 245 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS); 246 if (!req->wq) { 247 printk(KERN_ERR "Couldn't grow tag array\n"); 248 return ERR_PTR(-ENOMEM); 249 } 250 init_waitqueue_head(req->wq); 251 req->tc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, 252 GFP_NOFS); 253 req->rc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, 254 GFP_NOFS); 255 if ((!req->tc) || (!req->rc)) { 256 printk(KERN_ERR "Couldn't grow tag array\n"); 257 kfree(req->tc); 258 kfree(req->rc); 259 kfree(req->wq); 260 req->tc = req->rc = NULL; 261 req->wq = NULL; 262 return ERR_PTR(-ENOMEM); 263 } 264 req->tc->capacity = alloc_msize; 265 req->rc->capacity = alloc_msize; 266 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall); 267 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall); 268 } 269 270 p9pdu_reset(req->tc); 271 p9pdu_reset(req->rc); 272 273 req->tc->tag = tag-1; 274 req->status = REQ_STATUS_ALLOC; 275 276 return &c->reqs[row][col]; 277 } 278 279 /** 280 * p9_tag_lookup - lookup a request by tag 281 * @c: client session to lookup tag within 282 * @tag: numeric id for transaction 283 * 284 */ 285 286 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 287 { 288 int row, col; 289 290 /* This looks up the original request by tag so we know which 291 * buffer to read the data into */ 292 tag++; 293 294 if(tag >= c->max_tag) 295 return NULL; 296 297 row = tag / P9_ROW_MAXTAG; 298 col = tag % P9_ROW_MAXTAG; 299 300 return &c->reqs[row][col]; 301 } 302 EXPORT_SYMBOL(p9_tag_lookup); 303 304 /** 305 * p9_tag_init - setup tags structure and contents 306 * @c: v9fs client struct 307 * 308 * This initializes the tags structure for each client instance. 309 * 310 */ 311 312 static int p9_tag_init(struct p9_client *c) 313 { 314 int err = 0; 315 316 c->tagpool = p9_idpool_create(); 317 if (IS_ERR(c->tagpool)) { 318 err = PTR_ERR(c->tagpool); 319 goto error; 320 } 321 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */ 322 if (err < 0) { 323 p9_idpool_destroy(c->tagpool); 324 goto error; 325 } 326 c->max_tag = 0; 327 error: 328 return err; 329 } 330 331 /** 332 * p9_tag_cleanup - cleans up tags structure and reclaims resources 333 * @c: v9fs client struct 334 * 335 * This frees resources associated with the tags structure 336 * 337 */ 338 static void p9_tag_cleanup(struct p9_client *c) 339 { 340 int row, col; 341 342 /* check to insure all requests are idle */ 343 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 344 for (col = 0; col < P9_ROW_MAXTAG; col++) { 345 if (c->reqs[row][col].status != REQ_STATUS_IDLE) { 346 P9_DPRINTK(P9_DEBUG_MUX, 347 "Attempting to cleanup non-free tag %d,%d\n", 348 row, col); 349 /* TODO: delay execution of cleanup */ 350 return; 351 } 352 } 353 } 354 355 if (c->tagpool) { 356 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */ 357 p9_idpool_destroy(c->tagpool); 358 } 359 360 /* free requests associated with tags */ 361 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 362 for (col = 0; col < P9_ROW_MAXTAG; col++) { 363 kfree(c->reqs[row][col].wq); 364 kfree(c->reqs[row][col].tc); 365 kfree(c->reqs[row][col].rc); 366 } 367 kfree(c->reqs[row]); 368 } 369 c->max_tag = 0; 370 } 371 372 /** 373 * p9_free_req - free a request and clean-up as necessary 374 * c: client state 375 * r: request to release 376 * 377 */ 378 379 static void p9_free_req(struct p9_client *c, struct p9_req_t *r) 380 { 381 int tag = r->tc->tag; 382 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); 383 384 r->status = REQ_STATUS_IDLE; 385 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool)) 386 p9_idpool_put(tag, c->tagpool); 387 } 388 389 /** 390 * p9_client_cb - call back from transport to client 391 * c: client state 392 * req: request received 393 * 394 */ 395 void p9_client_cb(struct p9_client *c, struct p9_req_t *req) 396 { 397 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag); 398 wake_up(req->wq); 399 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag); 400 } 401 EXPORT_SYMBOL(p9_client_cb); 402 403 /** 404 * p9_parse_header - parse header arguments out of a packet 405 * @pdu: packet to parse 406 * @size: size of packet 407 * @type: type of request 408 * @tag: tag of packet 409 * @rewind: set if we need to rewind offset afterwards 410 */ 411 412 int 413 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, 414 int rewind) 415 { 416 int8_t r_type; 417 int16_t r_tag; 418 int32_t r_size; 419 int offset = pdu->offset; 420 int err; 421 422 pdu->offset = 0; 423 if (pdu->size == 0) 424 pdu->size = 7; 425 426 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 427 if (err) 428 goto rewind_and_exit; 429 430 pdu->size = r_size; 431 pdu->id = r_type; 432 pdu->tag = r_tag; 433 434 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size, 435 pdu->id, pdu->tag); 436 437 if (type) 438 *type = r_type; 439 if (tag) 440 *tag = r_tag; 441 if (size) 442 *size = r_size; 443 444 445 rewind_and_exit: 446 if (rewind) 447 pdu->offset = offset; 448 return err; 449 } 450 EXPORT_SYMBOL(p9_parse_header); 451 452 /** 453 * p9_check_errors - check 9p packet for error return and process it 454 * @c: current client instance 455 * @req: request to parse and check for error conditions 456 * 457 * returns error code if one is discovered, otherwise returns 0 458 * 459 * this will have to be more complicated if we have multiple 460 * error packet types 461 */ 462 463 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 464 { 465 int8_t type; 466 int err; 467 int ecode; 468 469 err = p9_parse_header(req->rc, NULL, &type, NULL, 0); 470 /* 471 * dump the response from server 472 * This should be after check errors which poplulate pdu_fcall. 473 */ 474 trace_9p_protocol_dump(c, req->rc); 475 if (err) { 476 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 477 return err; 478 } 479 if (type != P9_RERROR && type != P9_RLERROR) 480 return 0; 481 482 if (!p9_is_proto_dotl(c)) { 483 char *ename; 484 err = p9pdu_readf(req->rc, c->proto_version, "s?d", 485 &ename, &ecode); 486 if (err) 487 goto out_err; 488 489 if (p9_is_proto_dotu(c)) 490 err = -ecode; 491 492 if (!err || !IS_ERR_VALUE(err)) { 493 err = p9_errstr2errno(ename, strlen(ename)); 494 495 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 496 -ecode, ename); 497 } 498 kfree(ename); 499 } else { 500 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); 501 err = -ecode; 502 503 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 504 } 505 506 return err; 507 508 out_err: 509 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 510 511 return err; 512 } 513 514 /** 515 * p9_check_zc_errors - check 9p packet for error return and process it 516 * @c: current client instance 517 * @req: request to parse and check for error conditions 518 * @in_hdrlen: Size of response protocol buffer. 519 * 520 * returns error code if one is discovered, otherwise returns 0 521 * 522 * this will have to be more complicated if we have multiple 523 * error packet types 524 */ 525 526 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req, 527 char *uidata, int in_hdrlen, int kern_buf) 528 { 529 int err; 530 int ecode; 531 int8_t type; 532 char *ename = NULL; 533 534 err = p9_parse_header(req->rc, NULL, &type, NULL, 0); 535 /* 536 * dump the response from server 537 * This should be after parse_header which poplulate pdu_fcall. 538 */ 539 trace_9p_protocol_dump(c, req->rc); 540 if (err) { 541 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 542 return err; 543 } 544 545 if (type != P9_RERROR && type != P9_RLERROR) 546 return 0; 547 548 if (!p9_is_proto_dotl(c)) { 549 /* Error is reported in string format */ 550 uint16_t len; 551 /* 7 = header size for RERROR, 2 is the size of string len; */ 552 int inline_len = in_hdrlen - (7 + 2); 553 554 /* Read the size of error string */ 555 err = p9pdu_readf(req->rc, c->proto_version, "w", &len); 556 if (err) 557 goto out_err; 558 559 ename = kmalloc(len + 1, GFP_NOFS); 560 if (!ename) { 561 err = -ENOMEM; 562 goto out_err; 563 } 564 if (len <= inline_len) { 565 /* We have error in protocol buffer itself */ 566 if (pdu_read(req->rc, ename, len)) { 567 err = -EFAULT; 568 goto out_free; 569 570 } 571 } else { 572 /* 573 * Part of the data is in user space buffer. 574 */ 575 if (pdu_read(req->rc, ename, inline_len)) { 576 err = -EFAULT; 577 goto out_free; 578 579 } 580 if (kern_buf) { 581 memcpy(ename + inline_len, uidata, 582 len - inline_len); 583 } else { 584 err = copy_from_user(ename + inline_len, 585 uidata, len - inline_len); 586 if (err) { 587 err = -EFAULT; 588 goto out_free; 589 } 590 } 591 } 592 ename[len] = 0; 593 if (p9_is_proto_dotu(c)) { 594 /* For dotu we also have error code */ 595 err = p9pdu_readf(req->rc, 596 c->proto_version, "d", &ecode); 597 if (err) 598 goto out_free; 599 err = -ecode; 600 } 601 if (!err || !IS_ERR_VALUE(err)) { 602 err = p9_errstr2errno(ename, strlen(ename)); 603 604 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 605 -ecode, ename); 606 } 607 kfree(ename); 608 } else { 609 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); 610 err = -ecode; 611 612 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 613 } 614 return err; 615 616 out_free: 617 kfree(ename); 618 out_err: 619 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 620 return err; 621 } 622 623 static struct p9_req_t * 624 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 625 626 /** 627 * p9_client_flush - flush (cancel) a request 628 * @c: client state 629 * @oldreq: request to cancel 630 * 631 * This sents a flush for a particular request and links 632 * the flush request to the original request. The current 633 * code only supports a single flush request although the protocol 634 * allows for multiple flush requests to be sent for a single request. 635 * 636 */ 637 638 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 639 { 640 struct p9_req_t *req; 641 int16_t oldtag; 642 int err; 643 644 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); 645 if (err) 646 return err; 647 648 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 649 650 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 651 if (IS_ERR(req)) 652 return PTR_ERR(req); 653 654 655 /* if we haven't received a response for oldreq, 656 remove it from the list. */ 657 spin_lock(&c->lock); 658 if (oldreq->status == REQ_STATUS_FLSH) 659 list_del(&oldreq->req_list); 660 spin_unlock(&c->lock); 661 662 p9_free_req(c, req); 663 return 0; 664 } 665 666 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 667 int8_t type, int req_size, 668 const char *fmt, va_list ap) 669 { 670 int tag, err; 671 struct p9_req_t *req; 672 673 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type); 674 675 /* we allow for any status other than disconnected */ 676 if (c->status == Disconnected) 677 return ERR_PTR(-EIO); 678 679 /* if status is begin_disconnected we allow only clunk request */ 680 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) 681 return ERR_PTR(-EIO); 682 683 tag = P9_NOTAG; 684 if (type != P9_TVERSION) { 685 tag = p9_idpool_get(c->tagpool); 686 if (tag < 0) 687 return ERR_PTR(-ENOMEM); 688 } 689 690 req = p9_tag_alloc(c, tag, req_size); 691 if (IS_ERR(req)) 692 return req; 693 694 /* marshall the data */ 695 p9pdu_prepare(req->tc, tag, type); 696 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap); 697 if (err) 698 goto reterr; 699 p9pdu_finalize(c, req->tc); 700 trace_9p_client_req(c, type, tag); 701 return req; 702 reterr: 703 p9_free_req(c, req); 704 return ERR_PTR(err); 705 } 706 707 /** 708 * p9_client_rpc - issue a request and wait for a response 709 * @c: client session 710 * @type: type of request 711 * @fmt: protocol format string (see protocol.c) 712 * 713 * Returns request structure (which client must free using p9_free_req) 714 */ 715 716 static struct p9_req_t * 717 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 718 { 719 va_list ap; 720 int sigpending, err; 721 unsigned long flags; 722 struct p9_req_t *req; 723 724 va_start(ap, fmt); 725 req = p9_client_prepare_req(c, type, c->msize, fmt, ap); 726 va_end(ap); 727 if (IS_ERR(req)) 728 return req; 729 730 if (signal_pending(current)) { 731 sigpending = 1; 732 clear_thread_flag(TIF_SIGPENDING); 733 } else 734 sigpending = 0; 735 736 err = c->trans_mod->request(c, req); 737 if (err < 0) { 738 if (err != -ERESTARTSYS && err != -EFAULT) 739 c->status = Disconnected; 740 goto reterr; 741 } 742 /* Wait for the response */ 743 err = wait_event_interruptible(*req->wq, 744 req->status >= REQ_STATUS_RCVD); 745 746 if (req->status == REQ_STATUS_ERROR) { 747 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 748 err = req->t_err; 749 } 750 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 751 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n"); 752 sigpending = 1; 753 clear_thread_flag(TIF_SIGPENDING); 754 755 if (c->trans_mod->cancel(c, req)) 756 p9_client_flush(c, req); 757 758 /* if we received the response anyway, don't signal error */ 759 if (req->status == REQ_STATUS_RCVD) 760 err = 0; 761 } 762 if (sigpending) { 763 spin_lock_irqsave(¤t->sighand->siglock, flags); 764 recalc_sigpending(); 765 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 766 } 767 if (err < 0) 768 goto reterr; 769 770 err = p9_check_errors(c, req); 771 trace_9p_client_res(c, type, req->rc->tag, err); 772 if (!err) 773 return req; 774 reterr: 775 p9_free_req(c, req); 776 return ERR_PTR(err); 777 } 778 779 /** 780 * p9_client_zc_rpc - issue a request and wait for a response 781 * @c: client session 782 * @type: type of request 783 * @uidata: user bffer that should be ued for zero copy read 784 * @uodata: user buffer that shoud be user for zero copy write 785 * @inlen: read buffer size 786 * @olen: write buffer size 787 * @hdrlen: reader header size, This is the size of response protocol data 788 * @fmt: protocol format string (see protocol.c) 789 * 790 * Returns request structure (which client must free using p9_free_req) 791 */ 792 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 793 char *uidata, char *uodata, 794 int inlen, int olen, int in_hdrlen, 795 int kern_buf, const char *fmt, ...) 796 { 797 va_list ap; 798 int sigpending, err; 799 unsigned long flags; 800 struct p9_req_t *req; 801 802 va_start(ap, fmt); 803 /* 804 * We allocate a inline protocol data of only 4k bytes. 805 * The actual content is passed in zero-copy fashion. 806 */ 807 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); 808 va_end(ap); 809 if (IS_ERR(req)) 810 return req; 811 812 if (signal_pending(current)) { 813 sigpending = 1; 814 clear_thread_flag(TIF_SIGPENDING); 815 } else 816 sigpending = 0; 817 818 /* If we are called with KERNEL_DS force kern_buf */ 819 if (segment_eq(get_fs(), KERNEL_DS)) 820 kern_buf = 1; 821 822 err = c->trans_mod->zc_request(c, req, uidata, uodata, 823 inlen, olen, in_hdrlen, kern_buf); 824 if (err < 0) { 825 if (err == -EIO) 826 c->status = Disconnected; 827 goto reterr; 828 } 829 if (req->status == REQ_STATUS_ERROR) { 830 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 831 err = req->t_err; 832 } 833 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 834 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n"); 835 sigpending = 1; 836 clear_thread_flag(TIF_SIGPENDING); 837 838 if (c->trans_mod->cancel(c, req)) 839 p9_client_flush(c, req); 840 841 /* if we received the response anyway, don't signal error */ 842 if (req->status == REQ_STATUS_RCVD) 843 err = 0; 844 } 845 if (sigpending) { 846 spin_lock_irqsave(¤t->sighand->siglock, flags); 847 recalc_sigpending(); 848 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 849 } 850 if (err < 0) 851 goto reterr; 852 853 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf); 854 trace_9p_client_res(c, type, req->rc->tag, err); 855 if (!err) 856 return req; 857 reterr: 858 p9_free_req(c, req); 859 return ERR_PTR(err); 860 } 861 862 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 863 { 864 int ret; 865 struct p9_fid *fid; 866 unsigned long flags; 867 868 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt); 869 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 870 if (!fid) 871 return ERR_PTR(-ENOMEM); 872 873 ret = p9_idpool_get(clnt->fidpool); 874 if (ret < 0) { 875 ret = -ENOSPC; 876 goto error; 877 } 878 fid->fid = ret; 879 880 memset(&fid->qid, 0, sizeof(struct p9_qid)); 881 fid->mode = -1; 882 fid->uid = current_fsuid(); 883 fid->clnt = clnt; 884 fid->rdir = NULL; 885 spin_lock_irqsave(&clnt->lock, flags); 886 list_add(&fid->flist, &clnt->fidlist); 887 spin_unlock_irqrestore(&clnt->lock, flags); 888 889 return fid; 890 891 error: 892 kfree(fid); 893 return ERR_PTR(ret); 894 } 895 896 static void p9_fid_destroy(struct p9_fid *fid) 897 { 898 struct p9_client *clnt; 899 unsigned long flags; 900 901 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid); 902 clnt = fid->clnt; 903 p9_idpool_put(fid->fid, clnt->fidpool); 904 spin_lock_irqsave(&clnt->lock, flags); 905 list_del(&fid->flist); 906 spin_unlock_irqrestore(&clnt->lock, flags); 907 kfree(fid->rdir); 908 kfree(fid); 909 } 910 911 static int p9_client_version(struct p9_client *c) 912 { 913 int err = 0; 914 struct p9_req_t *req; 915 char *version; 916 int msize; 917 918 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 919 c->msize, c->proto_version); 920 921 switch (c->proto_version) { 922 case p9_proto_2000L: 923 req = p9_client_rpc(c, P9_TVERSION, "ds", 924 c->msize, "9P2000.L"); 925 break; 926 case p9_proto_2000u: 927 req = p9_client_rpc(c, P9_TVERSION, "ds", 928 c->msize, "9P2000.u"); 929 break; 930 case p9_proto_legacy: 931 req = p9_client_rpc(c, P9_TVERSION, "ds", 932 c->msize, "9P2000"); 933 break; 934 default: 935 return -EINVAL; 936 break; 937 } 938 939 if (IS_ERR(req)) 940 return PTR_ERR(req); 941 942 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version); 943 if (err) { 944 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err); 945 trace_9p_protocol_dump(c, req->rc); 946 goto error; 947 } 948 949 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 950 if (!strncmp(version, "9P2000.L", 8)) 951 c->proto_version = p9_proto_2000L; 952 else if (!strncmp(version, "9P2000.u", 8)) 953 c->proto_version = p9_proto_2000u; 954 else if (!strncmp(version, "9P2000", 6)) 955 c->proto_version = p9_proto_legacy; 956 else { 957 err = -EREMOTEIO; 958 goto error; 959 } 960 961 if (msize < c->msize) 962 c->msize = msize; 963 964 error: 965 kfree(version); 966 p9_free_req(c, req); 967 968 return err; 969 } 970 971 struct p9_client *p9_client_create(const char *dev_name, char *options) 972 { 973 int err; 974 struct p9_client *clnt; 975 976 err = 0; 977 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 978 if (!clnt) 979 return ERR_PTR(-ENOMEM); 980 981 clnt->trans_mod = NULL; 982 clnt->trans = NULL; 983 spin_lock_init(&clnt->lock); 984 INIT_LIST_HEAD(&clnt->fidlist); 985 986 err = p9_tag_init(clnt); 987 if (err < 0) 988 goto free_client; 989 990 err = parse_opts(options, clnt); 991 if (err < 0) 992 goto destroy_tagpool; 993 994 if (!clnt->trans_mod) 995 clnt->trans_mod = v9fs_get_default_trans(); 996 997 if (clnt->trans_mod == NULL) { 998 err = -EPROTONOSUPPORT; 999 P9_DPRINTK(P9_DEBUG_ERROR, 1000 "No transport defined or default transport\n"); 1001 goto destroy_tagpool; 1002 } 1003 1004 clnt->fidpool = p9_idpool_create(); 1005 if (IS_ERR(clnt->fidpool)) { 1006 err = PTR_ERR(clnt->fidpool); 1007 goto put_trans; 1008 } 1009 1010 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1011 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1012 1013 err = clnt->trans_mod->create(clnt, dev_name, options); 1014 if (err) 1015 goto destroy_fidpool; 1016 1017 if (clnt->msize > clnt->trans_mod->maxsize) 1018 clnt->msize = clnt->trans_mod->maxsize; 1019 1020 err = p9_client_version(clnt); 1021 if (err) 1022 goto close_trans; 1023 1024 return clnt; 1025 1026 close_trans: 1027 clnt->trans_mod->close(clnt); 1028 destroy_fidpool: 1029 p9_idpool_destroy(clnt->fidpool); 1030 put_trans: 1031 v9fs_put_trans(clnt->trans_mod); 1032 destroy_tagpool: 1033 p9_idpool_destroy(clnt->tagpool); 1034 free_client: 1035 kfree(clnt); 1036 return ERR_PTR(err); 1037 } 1038 EXPORT_SYMBOL(p9_client_create); 1039 1040 void p9_client_destroy(struct p9_client *clnt) 1041 { 1042 struct p9_fid *fid, *fidptr; 1043 1044 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt); 1045 1046 if (clnt->trans_mod) 1047 clnt->trans_mod->close(clnt); 1048 1049 v9fs_put_trans(clnt->trans_mod); 1050 1051 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) { 1052 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid); 1053 p9_fid_destroy(fid); 1054 } 1055 1056 if (clnt->fidpool) 1057 p9_idpool_destroy(clnt->fidpool); 1058 1059 p9_tag_cleanup(clnt); 1060 1061 kfree(clnt); 1062 } 1063 EXPORT_SYMBOL(p9_client_destroy); 1064 1065 void p9_client_disconnect(struct p9_client *clnt) 1066 { 1067 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); 1068 clnt->status = Disconnected; 1069 } 1070 EXPORT_SYMBOL(p9_client_disconnect); 1071 1072 void p9_client_begin_disconnect(struct p9_client *clnt) 1073 { 1074 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); 1075 clnt->status = BeginDisconnect; 1076 } 1077 EXPORT_SYMBOL(p9_client_begin_disconnect); 1078 1079 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1080 char *uname, u32 n_uname, char *aname) 1081 { 1082 int err = 0; 1083 struct p9_req_t *req; 1084 struct p9_fid *fid; 1085 struct p9_qid qid; 1086 1087 1088 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1089 afid ? afid->fid : -1, uname, aname); 1090 fid = p9_fid_create(clnt); 1091 if (IS_ERR(fid)) { 1092 err = PTR_ERR(fid); 1093 fid = NULL; 1094 goto error; 1095 } 1096 1097 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid, 1098 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1099 if (IS_ERR(req)) { 1100 err = PTR_ERR(req); 1101 goto error; 1102 } 1103 1104 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid); 1105 if (err) { 1106 trace_9p_protocol_dump(clnt, req->rc); 1107 p9_free_req(clnt, req); 1108 goto error; 1109 } 1110 1111 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1112 qid.type, 1113 (unsigned long long)qid.path, 1114 qid.version); 1115 1116 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1117 1118 p9_free_req(clnt, req); 1119 return fid; 1120 1121 error: 1122 if (fid) 1123 p9_fid_destroy(fid); 1124 return ERR_PTR(err); 1125 } 1126 EXPORT_SYMBOL(p9_client_attach); 1127 1128 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1129 char **wnames, int clone) 1130 { 1131 int err; 1132 struct p9_client *clnt; 1133 struct p9_fid *fid; 1134 struct p9_qid *wqids; 1135 struct p9_req_t *req; 1136 uint16_t nwqids, count; 1137 1138 err = 0; 1139 wqids = NULL; 1140 clnt = oldfid->clnt; 1141 if (clone) { 1142 fid = p9_fid_create(clnt); 1143 if (IS_ERR(fid)) { 1144 err = PTR_ERR(fid); 1145 fid = NULL; 1146 goto error; 1147 } 1148 1149 fid->uid = oldfid->uid; 1150 } else 1151 fid = oldfid; 1152 1153 1154 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1155 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1156 1157 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1158 nwname, wnames); 1159 if (IS_ERR(req)) { 1160 err = PTR_ERR(req); 1161 goto error; 1162 } 1163 1164 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1165 if (err) { 1166 trace_9p_protocol_dump(clnt, req->rc); 1167 p9_free_req(clnt, req); 1168 goto clunk_fid; 1169 } 1170 p9_free_req(clnt, req); 1171 1172 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1173 1174 if (nwqids != nwname) { 1175 err = -ENOENT; 1176 goto clunk_fid; 1177 } 1178 1179 for (count = 0; count < nwqids; count++) 1180 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1181 count, wqids[count].type, 1182 (unsigned long long)wqids[count].path, 1183 wqids[count].version); 1184 1185 if (nwname) 1186 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1187 else 1188 fid->qid = oldfid->qid; 1189 1190 kfree(wqids); 1191 return fid; 1192 1193 clunk_fid: 1194 kfree(wqids); 1195 p9_client_clunk(fid); 1196 fid = NULL; 1197 1198 error: 1199 if (fid && (fid != oldfid)) 1200 p9_fid_destroy(fid); 1201 1202 return ERR_PTR(err); 1203 } 1204 EXPORT_SYMBOL(p9_client_walk); 1205 1206 int p9_client_open(struct p9_fid *fid, int mode) 1207 { 1208 int err; 1209 struct p9_client *clnt; 1210 struct p9_req_t *req; 1211 struct p9_qid qid; 1212 int iounit; 1213 1214 clnt = fid->clnt; 1215 P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1216 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1217 err = 0; 1218 1219 if (fid->mode != -1) 1220 return -EINVAL; 1221 1222 if (p9_is_proto_dotl(clnt)) 1223 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1224 else 1225 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1226 if (IS_ERR(req)) { 1227 err = PTR_ERR(req); 1228 goto error; 1229 } 1230 1231 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1232 if (err) { 1233 trace_9p_protocol_dump(clnt, req->rc); 1234 goto free_and_error; 1235 } 1236 1237 P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1238 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1239 (unsigned long long)qid.path, qid.version, iounit); 1240 1241 fid->mode = mode; 1242 fid->iounit = iounit; 1243 1244 free_and_error: 1245 p9_free_req(clnt, req); 1246 error: 1247 return err; 1248 } 1249 EXPORT_SYMBOL(p9_client_open); 1250 1251 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode, 1252 gid_t gid, struct p9_qid *qid) 1253 { 1254 int err = 0; 1255 struct p9_client *clnt; 1256 struct p9_req_t *req; 1257 int iounit; 1258 1259 P9_DPRINTK(P9_DEBUG_9P, 1260 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1261 ofid->fid, name, flags, mode, gid); 1262 clnt = ofid->clnt; 1263 1264 if (ofid->mode != -1) 1265 return -EINVAL; 1266 1267 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags, 1268 mode, gid); 1269 if (IS_ERR(req)) { 1270 err = PTR_ERR(req); 1271 goto error; 1272 } 1273 1274 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit); 1275 if (err) { 1276 trace_9p_protocol_dump(clnt, req->rc); 1277 goto free_and_error; 1278 } 1279 1280 P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1281 qid->type, 1282 (unsigned long long)qid->path, 1283 qid->version, iounit); 1284 1285 ofid->mode = mode; 1286 ofid->iounit = iounit; 1287 1288 free_and_error: 1289 p9_free_req(clnt, req); 1290 error: 1291 return err; 1292 } 1293 EXPORT_SYMBOL(p9_client_create_dotl); 1294 1295 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, 1296 char *extension) 1297 { 1298 int err; 1299 struct p9_client *clnt; 1300 struct p9_req_t *req; 1301 struct p9_qid qid; 1302 int iounit; 1303 1304 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1305 fid->fid, name, perm, mode); 1306 err = 0; 1307 clnt = fid->clnt; 1308 1309 if (fid->mode != -1) 1310 return -EINVAL; 1311 1312 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1313 mode, extension); 1314 if (IS_ERR(req)) { 1315 err = PTR_ERR(req); 1316 goto error; 1317 } 1318 1319 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1320 if (err) { 1321 trace_9p_protocol_dump(clnt, req->rc); 1322 goto free_and_error; 1323 } 1324 1325 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1326 qid.type, 1327 (unsigned long long)qid.path, 1328 qid.version, iounit); 1329 1330 fid->mode = mode; 1331 fid->iounit = iounit; 1332 1333 free_and_error: 1334 p9_free_req(clnt, req); 1335 error: 1336 return err; 1337 } 1338 EXPORT_SYMBOL(p9_client_fcreate); 1339 1340 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid, 1341 struct p9_qid *qid) 1342 { 1343 int err = 0; 1344 struct p9_client *clnt; 1345 struct p9_req_t *req; 1346 1347 P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1348 dfid->fid, name, symtgt); 1349 clnt = dfid->clnt; 1350 1351 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt, 1352 gid); 1353 if (IS_ERR(req)) { 1354 err = PTR_ERR(req); 1355 goto error; 1356 } 1357 1358 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1359 if (err) { 1360 trace_9p_protocol_dump(clnt, req->rc); 1361 goto free_and_error; 1362 } 1363 1364 P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1365 qid->type, (unsigned long long)qid->path, qid->version); 1366 1367 free_and_error: 1368 p9_free_req(clnt, req); 1369 error: 1370 return err; 1371 } 1372 EXPORT_SYMBOL(p9_client_symlink); 1373 1374 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname) 1375 { 1376 struct p9_client *clnt; 1377 struct p9_req_t *req; 1378 1379 P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1380 dfid->fid, oldfid->fid, newname); 1381 clnt = dfid->clnt; 1382 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1383 newname); 1384 if (IS_ERR(req)) 1385 return PTR_ERR(req); 1386 1387 P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n"); 1388 p9_free_req(clnt, req); 1389 return 0; 1390 } 1391 EXPORT_SYMBOL(p9_client_link); 1392 1393 int p9_client_fsync(struct p9_fid *fid, int datasync) 1394 { 1395 int err; 1396 struct p9_client *clnt; 1397 struct p9_req_t *req; 1398 1399 P9_DPRINTK(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1400 fid->fid, datasync); 1401 err = 0; 1402 clnt = fid->clnt; 1403 1404 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1405 if (IS_ERR(req)) { 1406 err = PTR_ERR(req); 1407 goto error; 1408 } 1409 1410 P9_DPRINTK(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1411 1412 p9_free_req(clnt, req); 1413 1414 error: 1415 return err; 1416 } 1417 EXPORT_SYMBOL(p9_client_fsync); 1418 1419 int p9_client_clunk(struct p9_fid *fid) 1420 { 1421 int err; 1422 struct p9_client *clnt; 1423 struct p9_req_t *req; 1424 1425 if (!fid) { 1426 P9_EPRINTK(KERN_WARNING, "Trying to clunk with NULL fid\n"); 1427 dump_stack(); 1428 return 0; 1429 } 1430 1431 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid); 1432 err = 0; 1433 clnt = fid->clnt; 1434 1435 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1436 if (IS_ERR(req)) { 1437 err = PTR_ERR(req); 1438 goto error; 1439 } 1440 1441 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1442 1443 p9_free_req(clnt, req); 1444 error: 1445 /* 1446 * Fid is not valid even after a failed clunk 1447 */ 1448 p9_fid_destroy(fid); 1449 return err; 1450 } 1451 EXPORT_SYMBOL(p9_client_clunk); 1452 1453 int p9_client_remove(struct p9_fid *fid) 1454 { 1455 int err; 1456 struct p9_client *clnt; 1457 struct p9_req_t *req; 1458 1459 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1460 err = 0; 1461 clnt = fid->clnt; 1462 1463 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1464 if (IS_ERR(req)) { 1465 err = PTR_ERR(req); 1466 goto error; 1467 } 1468 1469 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1470 1471 p9_free_req(clnt, req); 1472 error: 1473 p9_fid_destroy(fid); 1474 return err; 1475 } 1476 EXPORT_SYMBOL(p9_client_remove); 1477 1478 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1479 { 1480 int err = 0; 1481 struct p9_req_t *req; 1482 struct p9_client *clnt; 1483 1484 P9_DPRINTK(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1485 dfid->fid, name, flags); 1486 1487 clnt = dfid->clnt; 1488 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1489 if (IS_ERR(req)) { 1490 err = PTR_ERR(req); 1491 goto error; 1492 } 1493 P9_DPRINTK(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1494 1495 p9_free_req(clnt, req); 1496 error: 1497 return err; 1498 } 1499 EXPORT_SYMBOL(p9_client_unlinkat); 1500 1501 int 1502 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, 1503 u32 count) 1504 { 1505 char *dataptr; 1506 int kernel_buf = 0; 1507 struct p9_req_t *req; 1508 struct p9_client *clnt; 1509 int err, rsize, non_zc = 0; 1510 1511 1512 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", 1513 fid->fid, (long long unsigned) offset, count); 1514 err = 0; 1515 clnt = fid->clnt; 1516 1517 rsize = fid->iounit; 1518 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1519 rsize = clnt->msize - P9_IOHDRSZ; 1520 1521 if (count < rsize) 1522 rsize = count; 1523 1524 /* Don't bother zerocopy for small IO (< 1024) */ 1525 if (clnt->trans_mod->zc_request && rsize > 1024) { 1526 char *indata; 1527 if (data) { 1528 kernel_buf = 1; 1529 indata = data; 1530 } else 1531 indata = (char *)udata; 1532 /* 1533 * response header len is 11 1534 * PDU Header(7) + IO Size (4) 1535 */ 1536 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0, 1537 11, kernel_buf, "dqd", fid->fid, 1538 offset, rsize); 1539 } else { 1540 non_zc = 1; 1541 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1542 rsize); 1543 } 1544 if (IS_ERR(req)) { 1545 err = PTR_ERR(req); 1546 goto error; 1547 } 1548 1549 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 1550 if (err) { 1551 trace_9p_protocol_dump(clnt, req->rc); 1552 goto free_and_error; 1553 } 1554 1555 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1556 1557 if (non_zc) { 1558 if (data) { 1559 memmove(data, dataptr, count); 1560 } else { 1561 err = copy_to_user(udata, dataptr, count); 1562 if (err) { 1563 err = -EFAULT; 1564 goto free_and_error; 1565 } 1566 } 1567 } 1568 p9_free_req(clnt, req); 1569 return count; 1570 1571 free_and_error: 1572 p9_free_req(clnt, req); 1573 error: 1574 return err; 1575 } 1576 EXPORT_SYMBOL(p9_client_read); 1577 1578 int 1579 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata, 1580 u64 offset, u32 count) 1581 { 1582 int err, rsize; 1583 int kernel_buf = 0; 1584 struct p9_client *clnt; 1585 struct p9_req_t *req; 1586 1587 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n", 1588 fid->fid, (long long unsigned) offset, count); 1589 err = 0; 1590 clnt = fid->clnt; 1591 1592 rsize = fid->iounit; 1593 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1594 rsize = clnt->msize - P9_IOHDRSZ; 1595 1596 if (count < rsize) 1597 rsize = count; 1598 1599 /* Don't bother zerocopy for small IO (< 1024) */ 1600 if (clnt->trans_mod->zc_request && rsize > 1024) { 1601 char *odata; 1602 if (data) { 1603 kernel_buf = 1; 1604 odata = data; 1605 } else 1606 odata = (char *)udata; 1607 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize, 1608 P9_ZC_HDR_SZ, kernel_buf, "dqd", 1609 fid->fid, offset, rsize); 1610 } else { 1611 if (data) 1612 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, 1613 offset, rsize, data); 1614 else 1615 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, 1616 offset, rsize, udata); 1617 } 1618 if (IS_ERR(req)) { 1619 err = PTR_ERR(req); 1620 goto error; 1621 } 1622 1623 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count); 1624 if (err) { 1625 trace_9p_protocol_dump(clnt, req->rc); 1626 goto free_and_error; 1627 } 1628 1629 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1630 1631 p9_free_req(clnt, req); 1632 return count; 1633 1634 free_and_error: 1635 p9_free_req(clnt, req); 1636 error: 1637 return err; 1638 } 1639 EXPORT_SYMBOL(p9_client_write); 1640 1641 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1642 { 1643 int err; 1644 struct p9_client *clnt; 1645 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1646 struct p9_req_t *req; 1647 u16 ignored; 1648 1649 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1650 1651 if (!ret) 1652 return ERR_PTR(-ENOMEM); 1653 1654 err = 0; 1655 clnt = fid->clnt; 1656 1657 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1658 if (IS_ERR(req)) { 1659 err = PTR_ERR(req); 1660 goto error; 1661 } 1662 1663 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret); 1664 if (err) { 1665 trace_9p_protocol_dump(clnt, req->rc); 1666 p9_free_req(clnt, req); 1667 goto error; 1668 } 1669 1670 P9_DPRINTK(P9_DEBUG_9P, 1671 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1672 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1673 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1674 "<<< uid=%d gid=%d n_muid=%d\n", 1675 ret->size, ret->type, ret->dev, ret->qid.type, 1676 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1677 ret->atime, ret->mtime, (unsigned long long)ret->length, 1678 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1679 ret->n_uid, ret->n_gid, ret->n_muid); 1680 1681 p9_free_req(clnt, req); 1682 return ret; 1683 1684 error: 1685 kfree(ret); 1686 return ERR_PTR(err); 1687 } 1688 EXPORT_SYMBOL(p9_client_stat); 1689 1690 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1691 u64 request_mask) 1692 { 1693 int err; 1694 struct p9_client *clnt; 1695 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1696 GFP_KERNEL); 1697 struct p9_req_t *req; 1698 1699 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1700 fid->fid, request_mask); 1701 1702 if (!ret) 1703 return ERR_PTR(-ENOMEM); 1704 1705 err = 0; 1706 clnt = fid->clnt; 1707 1708 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1709 if (IS_ERR(req)) { 1710 err = PTR_ERR(req); 1711 goto error; 1712 } 1713 1714 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret); 1715 if (err) { 1716 trace_9p_protocol_dump(clnt, req->rc); 1717 p9_free_req(clnt, req); 1718 goto error; 1719 } 1720 1721 P9_DPRINTK(P9_DEBUG_9P, 1722 "<<< RGETATTR st_result_mask=%lld\n" 1723 "<<< qid=%x.%llx.%x\n" 1724 "<<< st_mode=%8.8x st_nlink=%llu\n" 1725 "<<< st_uid=%d st_gid=%d\n" 1726 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1727 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1728 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1729 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1730 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1731 "<<< st_gen=%lld st_data_version=%lld", 1732 ret->st_result_mask, ret->qid.type, ret->qid.path, 1733 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid, 1734 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize, 1735 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1736 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1737 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1738 ret->st_gen, ret->st_data_version); 1739 1740 p9_free_req(clnt, req); 1741 return ret; 1742 1743 error: 1744 kfree(ret); 1745 return ERR_PTR(err); 1746 } 1747 EXPORT_SYMBOL(p9_client_getattr_dotl); 1748 1749 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1750 { 1751 int ret; 1752 1753 /* NOTE: size shouldn't include its own length */ 1754 /* size[2] type[2] dev[4] qid[13] */ 1755 /* mode[4] atime[4] mtime[4] length[8]*/ 1756 /* name[s] uid[s] gid[s] muid[s] */ 1757 ret = 2+4+13+4+4+4+8+2+2+2+2; 1758 1759 if (wst->name) 1760 ret += strlen(wst->name); 1761 if (wst->uid) 1762 ret += strlen(wst->uid); 1763 if (wst->gid) 1764 ret += strlen(wst->gid); 1765 if (wst->muid) 1766 ret += strlen(wst->muid); 1767 1768 if ((proto_version == p9_proto_2000u) || 1769 (proto_version == p9_proto_2000L)) { 1770 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1771 if (wst->extension) 1772 ret += strlen(wst->extension); 1773 } 1774 1775 return ret; 1776 } 1777 1778 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1779 { 1780 int err; 1781 struct p9_req_t *req; 1782 struct p9_client *clnt; 1783 1784 err = 0; 1785 clnt = fid->clnt; 1786 wst->size = p9_client_statsize(wst, clnt->proto_version); 1787 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1788 P9_DPRINTK(P9_DEBUG_9P, 1789 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1790 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1791 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1792 " uid=%d gid=%d n_muid=%d\n", 1793 wst->size, wst->type, wst->dev, wst->qid.type, 1794 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1795 wst->atime, wst->mtime, (unsigned long long)wst->length, 1796 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1797 wst->n_uid, wst->n_gid, wst->n_muid); 1798 1799 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1800 if (IS_ERR(req)) { 1801 err = PTR_ERR(req); 1802 goto error; 1803 } 1804 1805 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1806 1807 p9_free_req(clnt, req); 1808 error: 1809 return err; 1810 } 1811 EXPORT_SYMBOL(p9_client_wstat); 1812 1813 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1814 { 1815 int err; 1816 struct p9_req_t *req; 1817 struct p9_client *clnt; 1818 1819 err = 0; 1820 clnt = fid->clnt; 1821 P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1822 P9_DPRINTK(P9_DEBUG_9P, 1823 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1824 " atime_sec=%lld atime_nsec=%lld\n" 1825 " mtime_sec=%lld mtime_nsec=%lld\n", 1826 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid, 1827 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1828 p9attr->mtime_sec, p9attr->mtime_nsec); 1829 1830 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1831 1832 if (IS_ERR(req)) { 1833 err = PTR_ERR(req); 1834 goto error; 1835 } 1836 P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1837 p9_free_req(clnt, req); 1838 error: 1839 return err; 1840 } 1841 EXPORT_SYMBOL(p9_client_setattr); 1842 1843 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1844 { 1845 int err; 1846 struct p9_req_t *req; 1847 struct p9_client *clnt; 1848 1849 err = 0; 1850 clnt = fid->clnt; 1851 1852 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1853 1854 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1855 if (IS_ERR(req)) { 1856 err = PTR_ERR(req); 1857 goto error; 1858 } 1859 1860 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1861 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1862 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1863 if (err) { 1864 trace_9p_protocol_dump(clnt, req->rc); 1865 p9_free_req(clnt, req); 1866 goto error; 1867 } 1868 1869 P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1870 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1871 "fsid %llu namelen %ld\n", 1872 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1873 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1874 sb->fsid, (long int)sb->namelen); 1875 1876 p9_free_req(clnt, req); 1877 error: 1878 return err; 1879 } 1880 EXPORT_SYMBOL(p9_client_statfs); 1881 1882 int p9_client_rename(struct p9_fid *fid, 1883 struct p9_fid *newdirfid, const char *name) 1884 { 1885 int err; 1886 struct p9_req_t *req; 1887 struct p9_client *clnt; 1888 1889 err = 0; 1890 clnt = fid->clnt; 1891 1892 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1893 fid->fid, newdirfid->fid, name); 1894 1895 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1896 newdirfid->fid, name); 1897 if (IS_ERR(req)) { 1898 err = PTR_ERR(req); 1899 goto error; 1900 } 1901 1902 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1903 1904 p9_free_req(clnt, req); 1905 error: 1906 return err; 1907 } 1908 EXPORT_SYMBOL(p9_client_rename); 1909 1910 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1911 struct p9_fid *newdirfid, const char *new_name) 1912 { 1913 int err; 1914 struct p9_req_t *req; 1915 struct p9_client *clnt; 1916 1917 err = 0; 1918 clnt = olddirfid->clnt; 1919 1920 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" 1921 " newdirfid %d new name %s\n", olddirfid->fid, old_name, 1922 newdirfid->fid, new_name); 1923 1924 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1925 old_name, newdirfid->fid, new_name); 1926 if (IS_ERR(req)) { 1927 err = PTR_ERR(req); 1928 goto error; 1929 } 1930 1931 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1932 newdirfid->fid, new_name); 1933 1934 p9_free_req(clnt, req); 1935 error: 1936 return err; 1937 } 1938 EXPORT_SYMBOL(p9_client_renameat); 1939 1940 /* 1941 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1942 */ 1943 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1944 const char *attr_name, u64 *attr_size) 1945 { 1946 int err; 1947 struct p9_req_t *req; 1948 struct p9_client *clnt; 1949 struct p9_fid *attr_fid; 1950 1951 err = 0; 1952 clnt = file_fid->clnt; 1953 attr_fid = p9_fid_create(clnt); 1954 if (IS_ERR(attr_fid)) { 1955 err = PTR_ERR(attr_fid); 1956 attr_fid = NULL; 1957 goto error; 1958 } 1959 P9_DPRINTK(P9_DEBUG_9P, 1960 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 1961 file_fid->fid, attr_fid->fid, attr_name); 1962 1963 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 1964 file_fid->fid, attr_fid->fid, attr_name); 1965 if (IS_ERR(req)) { 1966 err = PTR_ERR(req); 1967 goto error; 1968 } 1969 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size); 1970 if (err) { 1971 trace_9p_protocol_dump(clnt, req->rc); 1972 p9_free_req(clnt, req); 1973 goto clunk_fid; 1974 } 1975 p9_free_req(clnt, req); 1976 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 1977 attr_fid->fid, *attr_size); 1978 return attr_fid; 1979 clunk_fid: 1980 p9_client_clunk(attr_fid); 1981 attr_fid = NULL; 1982 error: 1983 if (attr_fid && (attr_fid != file_fid)) 1984 p9_fid_destroy(attr_fid); 1985 1986 return ERR_PTR(err); 1987 } 1988 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 1989 1990 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 1991 u64 attr_size, int flags) 1992 { 1993 int err; 1994 struct p9_req_t *req; 1995 struct p9_client *clnt; 1996 1997 P9_DPRINTK(P9_DEBUG_9P, 1998 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 1999 fid->fid, name, (long long)attr_size, flags); 2000 err = 0; 2001 clnt = fid->clnt; 2002 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2003 fid->fid, name, attr_size, flags); 2004 if (IS_ERR(req)) { 2005 err = PTR_ERR(req); 2006 goto error; 2007 } 2008 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2009 p9_free_req(clnt, req); 2010 error: 2011 return err; 2012 } 2013 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2014 2015 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2016 { 2017 int err, rsize, non_zc = 0; 2018 struct p9_client *clnt; 2019 struct p9_req_t *req; 2020 char *dataptr; 2021 2022 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2023 fid->fid, (long long unsigned) offset, count); 2024 2025 err = 0; 2026 clnt = fid->clnt; 2027 2028 rsize = fid->iounit; 2029 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 2030 rsize = clnt->msize - P9_READDIRHDRSZ; 2031 2032 if (count < rsize) 2033 rsize = count; 2034 2035 /* Don't bother zerocopy for small IO (< 1024) */ 2036 if (clnt->trans_mod->zc_request && rsize > 1024) { 2037 /* 2038 * response header len is 11 2039 * PDU Header(7) + IO Size (4) 2040 */ 2041 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0, 2042 11, 1, "dqd", fid->fid, offset, rsize); 2043 } else { 2044 non_zc = 1; 2045 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2046 offset, rsize); 2047 } 2048 if (IS_ERR(req)) { 2049 err = PTR_ERR(req); 2050 goto error; 2051 } 2052 2053 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 2054 if (err) { 2055 trace_9p_protocol_dump(clnt, req->rc); 2056 goto free_and_error; 2057 } 2058 2059 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2060 2061 if (non_zc) 2062 memmove(data, dataptr, count); 2063 2064 p9_free_req(clnt, req); 2065 return count; 2066 2067 free_and_error: 2068 p9_free_req(clnt, req); 2069 error: 2070 return err; 2071 } 2072 EXPORT_SYMBOL(p9_client_readdir); 2073 2074 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode, 2075 dev_t rdev, gid_t gid, struct p9_qid *qid) 2076 { 2077 int err; 2078 struct p9_client *clnt; 2079 struct p9_req_t *req; 2080 2081 err = 0; 2082 clnt = fid->clnt; 2083 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 2084 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2085 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode, 2086 MAJOR(rdev), MINOR(rdev), gid); 2087 if (IS_ERR(req)) 2088 return PTR_ERR(req); 2089 2090 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 2091 if (err) { 2092 trace_9p_protocol_dump(clnt, req->rc); 2093 goto error; 2094 } 2095 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 2096 (unsigned long long)qid->path, qid->version); 2097 2098 error: 2099 p9_free_req(clnt, req); 2100 return err; 2101 2102 } 2103 EXPORT_SYMBOL(p9_client_mknod_dotl); 2104 2105 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode, 2106 gid_t gid, struct p9_qid *qid) 2107 { 2108 int err; 2109 struct p9_client *clnt; 2110 struct p9_req_t *req; 2111 2112 err = 0; 2113 clnt = fid->clnt; 2114 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2115 fid->fid, name, mode, gid); 2116 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode, 2117 gid); 2118 if (IS_ERR(req)) 2119 return PTR_ERR(req); 2120 2121 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 2122 if (err) { 2123 trace_9p_protocol_dump(clnt, req->rc); 2124 goto error; 2125 } 2126 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2127 (unsigned long long)qid->path, qid->version); 2128 2129 error: 2130 p9_free_req(clnt, req); 2131 return err; 2132 2133 } 2134 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2135 2136 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2137 { 2138 int err; 2139 struct p9_client *clnt; 2140 struct p9_req_t *req; 2141 2142 err = 0; 2143 clnt = fid->clnt; 2144 P9_DPRINTK(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " 2145 "start %lld length %lld proc_id %d client_id %s\n", 2146 fid->fid, flock->type, flock->flags, flock->start, 2147 flock->length, flock->proc_id, flock->client_id); 2148 2149 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2150 flock->flags, flock->start, flock->length, 2151 flock->proc_id, flock->client_id); 2152 2153 if (IS_ERR(req)) 2154 return PTR_ERR(req); 2155 2156 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status); 2157 if (err) { 2158 trace_9p_protocol_dump(clnt, req->rc); 2159 goto error; 2160 } 2161 P9_DPRINTK(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2162 error: 2163 p9_free_req(clnt, req); 2164 return err; 2165 2166 } 2167 EXPORT_SYMBOL(p9_client_lock_dotl); 2168 2169 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2170 { 2171 int err; 2172 struct p9_client *clnt; 2173 struct p9_req_t *req; 2174 2175 err = 0; 2176 clnt = fid->clnt; 2177 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " 2178 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, 2179 glock->start, glock->length, glock->proc_id, glock->client_id); 2180 2181 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, 2182 glock->start, glock->length, glock->proc_id, glock->client_id); 2183 2184 if (IS_ERR(req)) 2185 return PTR_ERR(req); 2186 2187 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type, 2188 &glock->start, &glock->length, &glock->proc_id, 2189 &glock->client_id); 2190 if (err) { 2191 trace_9p_protocol_dump(clnt, req->rc); 2192 goto error; 2193 } 2194 P9_DPRINTK(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " 2195 "proc_id %d client_id %s\n", glock->type, glock->start, 2196 glock->length, glock->proc_id, glock->client_id); 2197 error: 2198 p9_free_req(clnt, req); 2199 return err; 2200 } 2201 EXPORT_SYMBOL(p9_client_getlock_dotl); 2202 2203 int p9_client_readlink(struct p9_fid *fid, char **target) 2204 { 2205 int err; 2206 struct p9_client *clnt; 2207 struct p9_req_t *req; 2208 2209 err = 0; 2210 clnt = fid->clnt; 2211 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2212 2213 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2214 if (IS_ERR(req)) 2215 return PTR_ERR(req); 2216 2217 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target); 2218 if (err) { 2219 trace_9p_protocol_dump(clnt, req->rc); 2220 goto error; 2221 } 2222 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2223 error: 2224 p9_free_req(clnt, req); 2225 return err; 2226 } 2227 EXPORT_SYMBOL(p9_client_readlink); 2228