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