1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * net/9p/clnt.c 4 * 5 * 9P Client 6 * 7 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> 8 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net> 9 */ 10 11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 12 13 #include <linux/module.h> 14 #include <linux/errno.h> 15 #include <linux/fs.h> 16 #include <linux/poll.h> 17 #include <linux/idr.h> 18 #include <linux/mutex.h> 19 #include <linux/slab.h> 20 #include <linux/sched/signal.h> 21 #include <linux/uaccess.h> 22 #include <linux/uio.h> 23 #include <net/9p/9p.h> 24 #include <linux/parser.h> 25 #include <linux/seq_file.h> 26 #include <net/9p/client.h> 27 #include <net/9p/transport.h> 28 #include "protocol.h" 29 30 #define CREATE_TRACE_POINTS 31 #include <trace/events/9p.h> 32 33 /* 34 * Client Option Parsing (code inspired by NFS code) 35 * - a little lazy - parse all client options 36 */ 37 38 enum { 39 Opt_msize, 40 Opt_trans, 41 Opt_legacy, 42 Opt_version, 43 Opt_err, 44 }; 45 46 static const match_table_t tokens = { 47 {Opt_msize, "msize=%u"}, 48 {Opt_legacy, "noextend"}, 49 {Opt_trans, "trans=%s"}, 50 {Opt_version, "version=%s"}, 51 {Opt_err, NULL}, 52 }; 53 54 inline int p9_is_proto_dotl(struct p9_client *clnt) 55 { 56 return clnt->proto_version == p9_proto_2000L; 57 } 58 EXPORT_SYMBOL(p9_is_proto_dotl); 59 60 inline int p9_is_proto_dotu(struct p9_client *clnt) 61 { 62 return clnt->proto_version == p9_proto_2000u; 63 } 64 EXPORT_SYMBOL(p9_is_proto_dotu); 65 66 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt) 67 { 68 if (clnt->msize != 8192) 69 seq_printf(m, ",msize=%u", clnt->msize); 70 seq_printf(m, ",trans=%s", clnt->trans_mod->name); 71 72 switch (clnt->proto_version) { 73 case p9_proto_legacy: 74 seq_puts(m, ",noextend"); 75 break; 76 case p9_proto_2000u: 77 seq_puts(m, ",version=9p2000.u"); 78 break; 79 case p9_proto_2000L: 80 /* Default */ 81 break; 82 } 83 84 if (clnt->trans_mod->show_options) 85 return clnt->trans_mod->show_options(m, clnt); 86 return 0; 87 } 88 EXPORT_SYMBOL(p9_show_client_options); 89 90 /* 91 * Some error codes are taken directly from the server replies, 92 * make sure they are valid. 93 */ 94 static int safe_errno(int err) 95 { 96 if ((err > 0) || (err < -MAX_ERRNO)) { 97 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err); 98 return -EPROTO; 99 } 100 return err; 101 } 102 103 104 /* Interpret mount option for protocol version */ 105 static int get_protocol_version(char *s) 106 { 107 int version = -EINVAL; 108 109 if (!strcmp(s, "9p2000")) { 110 version = p9_proto_legacy; 111 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n"); 112 } else if (!strcmp(s, "9p2000.u")) { 113 version = p9_proto_2000u; 114 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); 115 } else if (!strcmp(s, "9p2000.L")) { 116 version = p9_proto_2000L; 117 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); 118 } else 119 pr_info("Unknown protocol version %s\n", s); 120 121 return version; 122 } 123 124 /** 125 * parse_options - parse mount options into client structure 126 * @opts: options string passed from mount 127 * @clnt: existing v9fs client information 128 * 129 * Return 0 upon success, -ERRNO upon failure 130 */ 131 132 static int parse_opts(char *opts, struct p9_client *clnt) 133 { 134 char *options, *tmp_options; 135 char *p; 136 substring_t args[MAX_OPT_ARGS]; 137 int option; 138 char *s; 139 int ret = 0; 140 141 clnt->proto_version = p9_proto_2000L; 142 clnt->msize = 8192; 143 144 if (!opts) 145 return 0; 146 147 tmp_options = kstrdup(opts, GFP_KERNEL); 148 if (!tmp_options) { 149 p9_debug(P9_DEBUG_ERROR, 150 "failed to allocate copy of option string\n"); 151 return -ENOMEM; 152 } 153 options = tmp_options; 154 155 while ((p = strsep(&options, ",")) != NULL) { 156 int token, r; 157 if (!*p) 158 continue; 159 token = match_token(p, tokens, args); 160 switch (token) { 161 case Opt_msize: 162 r = match_int(&args[0], &option); 163 if (r < 0) { 164 p9_debug(P9_DEBUG_ERROR, 165 "integer field, but no integer?\n"); 166 ret = r; 167 continue; 168 } 169 if (option < 4096) { 170 p9_debug(P9_DEBUG_ERROR, 171 "msize should be at least 4k\n"); 172 ret = -EINVAL; 173 continue; 174 } 175 clnt->msize = option; 176 break; 177 case Opt_trans: 178 s = match_strdup(&args[0]); 179 if (!s) { 180 ret = -ENOMEM; 181 p9_debug(P9_DEBUG_ERROR, 182 "problem allocating copy of trans arg\n"); 183 goto free_and_return; 184 } 185 186 v9fs_put_trans(clnt->trans_mod); 187 clnt->trans_mod = v9fs_get_trans_by_name(s); 188 if (clnt->trans_mod == NULL) { 189 pr_info("Could not find request transport: %s\n", 190 s); 191 ret = -EINVAL; 192 } 193 kfree(s); 194 break; 195 case Opt_legacy: 196 clnt->proto_version = p9_proto_legacy; 197 break; 198 case Opt_version: 199 s = match_strdup(&args[0]); 200 if (!s) { 201 ret = -ENOMEM; 202 p9_debug(P9_DEBUG_ERROR, 203 "problem allocating copy of version arg\n"); 204 goto free_and_return; 205 } 206 r = get_protocol_version(s); 207 if (r < 0) 208 ret = r; 209 else 210 clnt->proto_version = r; 211 kfree(s); 212 break; 213 default: 214 continue; 215 } 216 } 217 218 free_and_return: 219 if (ret) 220 v9fs_put_trans(clnt->trans_mod); 221 kfree(tmp_options); 222 return ret; 223 } 224 225 static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc, 226 int alloc_msize) 227 { 228 if (likely(c->fcall_cache) && alloc_msize == c->msize) { 229 fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS); 230 fc->cache = c->fcall_cache; 231 } else { 232 fc->sdata = kmalloc(alloc_msize, GFP_NOFS); 233 fc->cache = NULL; 234 } 235 if (!fc->sdata) 236 return -ENOMEM; 237 fc->capacity = alloc_msize; 238 return 0; 239 } 240 241 void p9_fcall_fini(struct p9_fcall *fc) 242 { 243 /* sdata can be NULL for interrupted requests in trans_rdma, 244 * and kmem_cache_free does not do NULL-check for us 245 */ 246 if (unlikely(!fc->sdata)) 247 return; 248 249 if (fc->cache) 250 kmem_cache_free(fc->cache, fc->sdata); 251 else 252 kfree(fc->sdata); 253 } 254 EXPORT_SYMBOL(p9_fcall_fini); 255 256 static struct kmem_cache *p9_req_cache; 257 258 /** 259 * p9_req_alloc - Allocate a new request. 260 * @c: Client session. 261 * @type: Transaction type. 262 * @max_size: Maximum packet size for this request. 263 * 264 * Context: Process context. 265 * Return: Pointer to new request. 266 */ 267 static struct p9_req_t * 268 p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size) 269 { 270 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); 271 int alloc_msize = min(c->msize, max_size); 272 int tag; 273 274 if (!req) 275 return ERR_PTR(-ENOMEM); 276 277 if (p9_fcall_init(c, &req->tc, alloc_msize)) 278 goto free_req; 279 if (p9_fcall_init(c, &req->rc, alloc_msize)) 280 goto free; 281 282 p9pdu_reset(&req->tc); 283 p9pdu_reset(&req->rc); 284 req->t_err = 0; 285 req->status = REQ_STATUS_ALLOC; 286 init_waitqueue_head(&req->wq); 287 INIT_LIST_HEAD(&req->req_list); 288 289 idr_preload(GFP_NOFS); 290 spin_lock_irq(&c->lock); 291 if (type == P9_TVERSION) 292 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1, 293 GFP_NOWAIT); 294 else 295 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT); 296 req->tc.tag = tag; 297 spin_unlock_irq(&c->lock); 298 idr_preload_end(); 299 if (tag < 0) 300 goto free; 301 302 /* Init ref to two because in the general case there is one ref 303 * that is put asynchronously by a writer thread, one ref 304 * temporarily given by p9_tag_lookup and put by p9_client_cb 305 * in the recv thread, and one ref put by p9_tag_remove in the 306 * main thread. The only exception is virtio that does not use 307 * p9_tag_lookup but does not have a writer thread either 308 * (the write happens synchronously in the request/zc_request 309 * callback), so p9_client_cb eats the second ref there 310 * as the pointer is duplicated directly by virtqueue_add_sgs() 311 */ 312 refcount_set(&req->refcount.refcount, 2); 313 314 return req; 315 316 free: 317 p9_fcall_fini(&req->tc); 318 p9_fcall_fini(&req->rc); 319 free_req: 320 kmem_cache_free(p9_req_cache, req); 321 return ERR_PTR(-ENOMEM); 322 } 323 324 /** 325 * p9_tag_lookup - Look up a request by tag. 326 * @c: Client session. 327 * @tag: Transaction ID. 328 * 329 * Context: Any context. 330 * Return: A request, or %NULL if there is no request with that tag. 331 */ 332 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 333 { 334 struct p9_req_t *req; 335 336 rcu_read_lock(); 337 again: 338 req = idr_find(&c->reqs, tag); 339 if (req) { 340 /* We have to be careful with the req found under rcu_read_lock 341 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the 342 * ref again without corrupting other data, then check again 343 * that the tag matches once we have the ref 344 */ 345 if (!p9_req_try_get(req)) 346 goto again; 347 if (req->tc.tag != tag) { 348 p9_req_put(req); 349 goto again; 350 } 351 } 352 rcu_read_unlock(); 353 354 return req; 355 } 356 EXPORT_SYMBOL(p9_tag_lookup); 357 358 /** 359 * p9_tag_remove - Remove a tag. 360 * @c: Client session. 361 * @r: Request of reference. 362 * 363 * Context: Any context. 364 */ 365 static int p9_tag_remove(struct p9_client *c, struct p9_req_t *r) 366 { 367 unsigned long flags; 368 u16 tag = r->tc.tag; 369 370 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); 371 spin_lock_irqsave(&c->lock, flags); 372 idr_remove(&c->reqs, tag); 373 spin_unlock_irqrestore(&c->lock, flags); 374 return p9_req_put(r); 375 } 376 377 static void p9_req_free(struct kref *ref) 378 { 379 struct p9_req_t *r = container_of(ref, struct p9_req_t, refcount); 380 p9_fcall_fini(&r->tc); 381 p9_fcall_fini(&r->rc); 382 kmem_cache_free(p9_req_cache, r); 383 } 384 385 int p9_req_put(struct p9_req_t *r) 386 { 387 return kref_put(&r->refcount, p9_req_free); 388 } 389 EXPORT_SYMBOL(p9_req_put); 390 391 /** 392 * p9_tag_cleanup - cleans up tags structure and reclaims resources 393 * @c: v9fs client struct 394 * 395 * This frees resources associated with the tags structure 396 * 397 */ 398 static void p9_tag_cleanup(struct p9_client *c) 399 { 400 struct p9_req_t *req; 401 int id; 402 403 rcu_read_lock(); 404 idr_for_each_entry(&c->reqs, req, id) { 405 pr_info("Tag %d still in use\n", id); 406 if (p9_tag_remove(c, req) == 0) 407 pr_warn("Packet with tag %d has still references", 408 req->tc.tag); 409 } 410 rcu_read_unlock(); 411 } 412 413 /** 414 * p9_client_cb - call back from transport to client 415 * c: client state 416 * req: request received 417 * 418 */ 419 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) 420 { 421 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); 422 423 /* 424 * This barrier is needed to make sure any change made to req before 425 * the status change is visible to another thread 426 */ 427 smp_wmb(); 428 req->status = status; 429 430 wake_up(&req->wq); 431 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); 432 p9_req_put(req); 433 } 434 EXPORT_SYMBOL(p9_client_cb); 435 436 /** 437 * p9_parse_header - parse header arguments out of a packet 438 * @pdu: packet to parse 439 * @size: size of packet 440 * @type: type of request 441 * @tag: tag of packet 442 * @rewind: set if we need to rewind offset afterwards 443 */ 444 445 int 446 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, 447 int rewind) 448 { 449 int8_t r_type; 450 int16_t r_tag; 451 int32_t r_size; 452 int offset = pdu->offset; 453 int err; 454 455 pdu->offset = 0; 456 457 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 458 if (err) 459 goto rewind_and_exit; 460 461 if (type) 462 *type = r_type; 463 if (tag) 464 *tag = r_tag; 465 if (size) 466 *size = r_size; 467 468 if (pdu->size != r_size || r_size < 7) { 469 err = -EINVAL; 470 goto rewind_and_exit; 471 } 472 473 pdu->id = r_type; 474 pdu->tag = r_tag; 475 476 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 477 pdu->size, pdu->id, pdu->tag); 478 479 rewind_and_exit: 480 if (rewind) 481 pdu->offset = offset; 482 return err; 483 } 484 EXPORT_SYMBOL(p9_parse_header); 485 486 /** 487 * p9_check_errors - check 9p packet for error return and process it 488 * @c: current client instance 489 * @req: request to parse and check for error conditions 490 * 491 * returns error code if one is discovered, otherwise returns 0 492 * 493 * this will have to be more complicated if we have multiple 494 * error packet types 495 */ 496 497 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 498 { 499 int8_t type; 500 int err; 501 int ecode; 502 503 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 504 if (req->rc.size >= c->msize) { 505 p9_debug(P9_DEBUG_ERROR, 506 "requested packet size too big: %d\n", 507 req->rc.size); 508 return -EIO; 509 } 510 /* 511 * dump the response from server 512 * This should be after check errors which poplulate pdu_fcall. 513 */ 514 trace_9p_protocol_dump(c, &req->rc); 515 if (err) { 516 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 517 return err; 518 } 519 if (type != P9_RERROR && type != P9_RLERROR) 520 return 0; 521 522 if (!p9_is_proto_dotl(c)) { 523 char *ename; 524 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 525 &ename, &ecode); 526 if (err) 527 goto out_err; 528 529 if (p9_is_proto_dotu(c) && ecode < 512) 530 err = -ecode; 531 532 if (!err) { 533 err = p9_errstr2errno(ename, strlen(ename)); 534 535 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 536 -ecode, ename); 537 } 538 kfree(ename); 539 } else { 540 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 541 err = -ecode; 542 543 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 544 } 545 546 return err; 547 548 out_err: 549 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 550 551 return err; 552 } 553 554 /** 555 * p9_check_zc_errors - check 9p packet for error return and process it 556 * @c: current client instance 557 * @req: request to parse and check for error conditions 558 * @in_hdrlen: Size of response protocol buffer. 559 * 560 * returns error code if one is discovered, otherwise returns 0 561 * 562 * this will have to be more complicated if we have multiple 563 * error packet types 564 */ 565 566 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req, 567 struct iov_iter *uidata, int in_hdrlen) 568 { 569 int err; 570 int ecode; 571 int8_t type; 572 char *ename = NULL; 573 574 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 575 /* 576 * dump the response from server 577 * This should be after parse_header which poplulate pdu_fcall. 578 */ 579 trace_9p_protocol_dump(c, &req->rc); 580 if (err) { 581 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 582 return err; 583 } 584 585 if (type != P9_RERROR && type != P9_RLERROR) 586 return 0; 587 588 if (!p9_is_proto_dotl(c)) { 589 /* Error is reported in string format */ 590 int len; 591 /* 7 = header size for RERROR; */ 592 int inline_len = in_hdrlen - 7; 593 594 len = req->rc.size - req->rc.offset; 595 if (len > (P9_ZC_HDR_SZ - 7)) { 596 err = -EFAULT; 597 goto out_err; 598 } 599 600 ename = &req->rc.sdata[req->rc.offset]; 601 if (len > inline_len) { 602 /* We have error in external buffer */ 603 if (!copy_from_iter_full(ename + inline_len, 604 len - inline_len, uidata)) { 605 err = -EFAULT; 606 goto out_err; 607 } 608 } 609 ename = NULL; 610 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 611 &ename, &ecode); 612 if (err) 613 goto out_err; 614 615 if (p9_is_proto_dotu(c) && ecode < 512) 616 err = -ecode; 617 618 if (!err) { 619 err = p9_errstr2errno(ename, strlen(ename)); 620 621 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 622 -ecode, ename); 623 } 624 kfree(ename); 625 } else { 626 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 627 err = -ecode; 628 629 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 630 } 631 return err; 632 633 out_err: 634 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 635 return err; 636 } 637 638 static struct p9_req_t * 639 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 640 641 /** 642 * p9_client_flush - flush (cancel) a request 643 * @c: client state 644 * @oldreq: request to cancel 645 * 646 * This sents a flush for a particular request and links 647 * the flush request to the original request. The current 648 * code only supports a single flush request although the protocol 649 * allows for multiple flush requests to be sent for a single request. 650 * 651 */ 652 653 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 654 { 655 struct p9_req_t *req; 656 int16_t oldtag; 657 int err; 658 659 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); 660 if (err) 661 return err; 662 663 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 664 665 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 666 if (IS_ERR(req)) 667 return PTR_ERR(req); 668 669 /* 670 * if we haven't received a response for oldreq, 671 * remove it from the list 672 */ 673 if (oldreq->status == REQ_STATUS_SENT) { 674 if (c->trans_mod->cancelled) 675 c->trans_mod->cancelled(c, oldreq); 676 } 677 678 p9_tag_remove(c, req); 679 return 0; 680 } 681 682 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 683 int8_t type, int req_size, 684 const char *fmt, va_list ap) 685 { 686 int err; 687 struct p9_req_t *req; 688 689 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 690 691 /* we allow for any status other than disconnected */ 692 if (c->status == Disconnected) 693 return ERR_PTR(-EIO); 694 695 /* if status is begin_disconnected we allow only clunk request */ 696 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) 697 return ERR_PTR(-EIO); 698 699 req = p9_tag_alloc(c, type, req_size); 700 if (IS_ERR(req)) 701 return req; 702 703 /* marshall the data */ 704 p9pdu_prepare(&req->tc, req->tc.tag, type); 705 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); 706 if (err) 707 goto reterr; 708 p9pdu_finalize(c, &req->tc); 709 trace_9p_client_req(c, type, req->tc.tag); 710 return req; 711 reterr: 712 p9_tag_remove(c, req); 713 /* We have to put also the 2nd reference as it won't be used */ 714 p9_req_put(req); 715 return ERR_PTR(err); 716 } 717 718 /** 719 * p9_client_rpc - issue a request and wait for a response 720 * @c: client session 721 * @type: type of request 722 * @fmt: protocol format string (see protocol.c) 723 * 724 * Returns request structure (which client must free using p9_tag_remove) 725 */ 726 727 static struct p9_req_t * 728 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 729 { 730 va_list ap; 731 int sigpending, err; 732 unsigned long flags; 733 struct p9_req_t *req; 734 735 va_start(ap, fmt); 736 req = p9_client_prepare_req(c, type, c->msize, fmt, ap); 737 va_end(ap); 738 if (IS_ERR(req)) 739 return req; 740 741 if (signal_pending(current)) { 742 sigpending = 1; 743 clear_thread_flag(TIF_SIGPENDING); 744 } else 745 sigpending = 0; 746 747 err = c->trans_mod->request(c, req); 748 if (err < 0) { 749 /* write won't happen */ 750 p9_req_put(req); 751 if (err != -ERESTARTSYS && err != -EFAULT) 752 c->status = Disconnected; 753 goto recalc_sigpending; 754 } 755 again: 756 /* Wait for the response */ 757 err = wait_event_killable(req->wq, 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 recalc_sigpending: 789 if (sigpending) { 790 spin_lock_irqsave(¤t->sighand->siglock, flags); 791 recalc_sigpending(); 792 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 793 } 794 if (err < 0) 795 goto reterr; 796 797 err = p9_check_errors(c, req); 798 trace_9p_client_res(c, type, req->rc.tag, err); 799 if (!err) 800 return req; 801 reterr: 802 p9_tag_remove(c, req); 803 return ERR_PTR(safe_errno(err)); 804 } 805 806 /** 807 * p9_client_zc_rpc - issue a request and wait for a response 808 * @c: client session 809 * @type: type of request 810 * @uidata: destination for zero copy read 811 * @uodata: source for zero copy write 812 * @inlen: read buffer size 813 * @olen: write buffer size 814 * @in_hdrlen: reader header size, This is the size of response protocol data 815 * @fmt: protocol format string (see protocol.c) 816 * 817 * Returns request structure (which client must free using p9_tag_remove) 818 */ 819 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 820 struct iov_iter *uidata, 821 struct iov_iter *uodata, 822 int inlen, int olen, int in_hdrlen, 823 const char *fmt, ...) 824 { 825 va_list ap; 826 int sigpending, err; 827 unsigned long flags; 828 struct p9_req_t *req; 829 830 va_start(ap, fmt); 831 /* 832 * We allocate a inline protocol data of only 4k bytes. 833 * The actual content is passed in zero-copy fashion. 834 */ 835 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); 836 va_end(ap); 837 if (IS_ERR(req)) 838 return req; 839 840 if (signal_pending(current)) { 841 sigpending = 1; 842 clear_thread_flag(TIF_SIGPENDING); 843 } else 844 sigpending = 0; 845 846 err = c->trans_mod->zc_request(c, req, uidata, uodata, 847 inlen, olen, in_hdrlen); 848 if (err < 0) { 849 if (err == -EIO) 850 c->status = Disconnected; 851 if (err != -ERESTARTSYS) 852 goto recalc_sigpending; 853 } 854 if (req->status == REQ_STATUS_ERROR) { 855 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 856 err = req->t_err; 857 } 858 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 859 p9_debug(P9_DEBUG_MUX, "flushing\n"); 860 sigpending = 1; 861 clear_thread_flag(TIF_SIGPENDING); 862 863 if (c->trans_mod->cancel(c, req)) 864 p9_client_flush(c, req); 865 866 /* if we received the response anyway, don't signal error */ 867 if (req->status == REQ_STATUS_RCVD) 868 err = 0; 869 } 870 recalc_sigpending: 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); 880 trace_9p_client_res(c, type, req->rc.tag, err); 881 if (!err) 882 return req; 883 reterr: 884 p9_tag_remove(c, req); 885 return ERR_PTR(safe_errno(err)); 886 } 887 888 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 889 { 890 int ret; 891 struct p9_fid *fid; 892 893 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 894 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 895 if (!fid) 896 return NULL; 897 898 memset(&fid->qid, 0, sizeof(struct p9_qid)); 899 fid->mode = -1; 900 fid->uid = current_fsuid(); 901 fid->clnt = clnt; 902 fid->rdir = NULL; 903 fid->fid = 0; 904 905 idr_preload(GFP_KERNEL); 906 spin_lock_irq(&clnt->lock); 907 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, 908 GFP_NOWAIT); 909 spin_unlock_irq(&clnt->lock); 910 idr_preload_end(); 911 912 if (!ret) 913 return fid; 914 915 kfree(fid); 916 return NULL; 917 } 918 919 static void p9_fid_destroy(struct p9_fid *fid) 920 { 921 struct p9_client *clnt; 922 unsigned long flags; 923 924 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 925 clnt = fid->clnt; 926 spin_lock_irqsave(&clnt->lock, flags); 927 idr_remove(&clnt->fids, fid->fid); 928 spin_unlock_irqrestore(&clnt->lock, flags); 929 kfree(fid->rdir); 930 kfree(fid); 931 } 932 933 static int p9_client_version(struct p9_client *c) 934 { 935 int err = 0; 936 struct p9_req_t *req; 937 char *version = NULL; 938 int msize; 939 940 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 941 c->msize, c->proto_version); 942 943 switch (c->proto_version) { 944 case p9_proto_2000L: 945 req = p9_client_rpc(c, P9_TVERSION, "ds", 946 c->msize, "9P2000.L"); 947 break; 948 case p9_proto_2000u: 949 req = p9_client_rpc(c, P9_TVERSION, "ds", 950 c->msize, "9P2000.u"); 951 break; 952 case p9_proto_legacy: 953 req = p9_client_rpc(c, P9_TVERSION, "ds", 954 c->msize, "9P2000"); 955 break; 956 default: 957 return -EINVAL; 958 } 959 960 if (IS_ERR(req)) 961 return PTR_ERR(req); 962 963 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); 964 if (err) { 965 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 966 trace_9p_protocol_dump(c, &req->rc); 967 goto error; 968 } 969 970 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 971 if (!strncmp(version, "9P2000.L", 8)) 972 c->proto_version = p9_proto_2000L; 973 else if (!strncmp(version, "9P2000.u", 8)) 974 c->proto_version = p9_proto_2000u; 975 else if (!strncmp(version, "9P2000", 6)) 976 c->proto_version = p9_proto_legacy; 977 else { 978 p9_debug(P9_DEBUG_ERROR, 979 "server returned an unknown version: %s\n", version); 980 err = -EREMOTEIO; 981 goto error; 982 } 983 984 if (msize < 4096) { 985 p9_debug(P9_DEBUG_ERROR, 986 "server returned a msize < 4096: %d\n", msize); 987 err = -EREMOTEIO; 988 goto error; 989 } 990 if (msize < c->msize) 991 c->msize = msize; 992 993 error: 994 kfree(version); 995 p9_tag_remove(c, req); 996 997 return err; 998 } 999 1000 struct p9_client *p9_client_create(const char *dev_name, char *options) 1001 { 1002 int err; 1003 struct p9_client *clnt; 1004 char *client_id; 1005 1006 err = 0; 1007 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 1008 if (!clnt) 1009 return ERR_PTR(-ENOMEM); 1010 1011 clnt->trans_mod = NULL; 1012 clnt->trans = NULL; 1013 clnt->fcall_cache = NULL; 1014 1015 client_id = utsname()->nodename; 1016 memcpy(clnt->name, client_id, strlen(client_id) + 1); 1017 1018 spin_lock_init(&clnt->lock); 1019 idr_init(&clnt->fids); 1020 idr_init(&clnt->reqs); 1021 1022 err = parse_opts(options, clnt); 1023 if (err < 0) 1024 goto free_client; 1025 1026 if (!clnt->trans_mod) 1027 clnt->trans_mod = v9fs_get_default_trans(); 1028 1029 if (clnt->trans_mod == NULL) { 1030 err = -EPROTONOSUPPORT; 1031 p9_debug(P9_DEBUG_ERROR, 1032 "No transport defined or default transport\n"); 1033 goto free_client; 1034 } 1035 1036 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1037 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1038 1039 err = clnt->trans_mod->create(clnt, dev_name, options); 1040 if (err) 1041 goto put_trans; 1042 1043 if (clnt->msize > clnt->trans_mod->maxsize) 1044 clnt->msize = clnt->trans_mod->maxsize; 1045 1046 if (clnt->msize < 4096) { 1047 p9_debug(P9_DEBUG_ERROR, 1048 "Please specify a msize of at least 4k\n"); 1049 err = -EINVAL; 1050 goto close_trans; 1051 } 1052 1053 err = p9_client_version(clnt); 1054 if (err) 1055 goto close_trans; 1056 1057 /* P9_HDRSZ + 4 is the smallest packet header we can have that is 1058 * followed by data accessed from userspace by read 1059 */ 1060 clnt->fcall_cache = 1061 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, 1062 0, 0, P9_HDRSZ + 4, 1063 clnt->msize - (P9_HDRSZ + 4), 1064 NULL); 1065 1066 return clnt; 1067 1068 close_trans: 1069 clnt->trans_mod->close(clnt); 1070 put_trans: 1071 v9fs_put_trans(clnt->trans_mod); 1072 free_client: 1073 kfree(clnt); 1074 return ERR_PTR(err); 1075 } 1076 EXPORT_SYMBOL(p9_client_create); 1077 1078 void p9_client_destroy(struct p9_client *clnt) 1079 { 1080 struct p9_fid *fid; 1081 int id; 1082 1083 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1084 1085 if (clnt->trans_mod) 1086 clnt->trans_mod->close(clnt); 1087 1088 v9fs_put_trans(clnt->trans_mod); 1089 1090 idr_for_each_entry(&clnt->fids, fid, id) { 1091 pr_info("Found fid %d not clunked\n", fid->fid); 1092 p9_fid_destroy(fid); 1093 } 1094 1095 p9_tag_cleanup(clnt); 1096 1097 kmem_cache_destroy(clnt->fcall_cache); 1098 kfree(clnt); 1099 } 1100 EXPORT_SYMBOL(p9_client_destroy); 1101 1102 void p9_client_disconnect(struct p9_client *clnt) 1103 { 1104 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1105 clnt->status = Disconnected; 1106 } 1107 EXPORT_SYMBOL(p9_client_disconnect); 1108 1109 void p9_client_begin_disconnect(struct p9_client *clnt) 1110 { 1111 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1112 clnt->status = BeginDisconnect; 1113 } 1114 EXPORT_SYMBOL(p9_client_begin_disconnect); 1115 1116 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1117 const char *uname, kuid_t n_uname, const char *aname) 1118 { 1119 int err = 0; 1120 struct p9_req_t *req; 1121 struct p9_fid *fid; 1122 struct p9_qid qid; 1123 1124 1125 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1126 afid ? afid->fid : -1, uname, aname); 1127 fid = p9_fid_create(clnt); 1128 if (!fid) { 1129 err = -ENOMEM; 1130 goto error; 1131 } 1132 fid->uid = n_uname; 1133 1134 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1135 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1136 if (IS_ERR(req)) { 1137 err = PTR_ERR(req); 1138 goto error; 1139 } 1140 1141 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); 1142 if (err) { 1143 trace_9p_protocol_dump(clnt, &req->rc); 1144 p9_tag_remove(clnt, req); 1145 goto error; 1146 } 1147 1148 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1149 qid.type, (unsigned long long)qid.path, qid.version); 1150 1151 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1152 1153 p9_tag_remove(clnt, req); 1154 return fid; 1155 1156 error: 1157 if (fid) 1158 p9_fid_destroy(fid); 1159 return ERR_PTR(err); 1160 } 1161 EXPORT_SYMBOL(p9_client_attach); 1162 1163 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1164 const unsigned char * const *wnames, int clone) 1165 { 1166 int err; 1167 struct p9_client *clnt; 1168 struct p9_fid *fid; 1169 struct p9_qid *wqids; 1170 struct p9_req_t *req; 1171 uint16_t nwqids, count; 1172 1173 err = 0; 1174 wqids = NULL; 1175 clnt = oldfid->clnt; 1176 if (clone) { 1177 fid = p9_fid_create(clnt); 1178 if (!fid) { 1179 err = -ENOMEM; 1180 goto error; 1181 } 1182 1183 fid->uid = oldfid->uid; 1184 } else 1185 fid = oldfid; 1186 1187 1188 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1189 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1190 1191 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1192 nwname, wnames); 1193 if (IS_ERR(req)) { 1194 err = PTR_ERR(req); 1195 goto error; 1196 } 1197 1198 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1199 if (err) { 1200 trace_9p_protocol_dump(clnt, &req->rc); 1201 p9_tag_remove(clnt, req); 1202 goto clunk_fid; 1203 } 1204 p9_tag_remove(clnt, req); 1205 1206 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1207 1208 if (nwqids != nwname) { 1209 err = -ENOENT; 1210 goto clunk_fid; 1211 } 1212 1213 for (count = 0; count < nwqids; count++) 1214 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1215 count, wqids[count].type, 1216 (unsigned long long)wqids[count].path, 1217 wqids[count].version); 1218 1219 if (nwname) 1220 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1221 else 1222 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); 1223 1224 kfree(wqids); 1225 return fid; 1226 1227 clunk_fid: 1228 kfree(wqids); 1229 p9_client_clunk(fid); 1230 fid = NULL; 1231 1232 error: 1233 if (fid && (fid != oldfid)) 1234 p9_fid_destroy(fid); 1235 1236 return ERR_PTR(err); 1237 } 1238 EXPORT_SYMBOL(p9_client_walk); 1239 1240 int p9_client_open(struct p9_fid *fid, int mode) 1241 { 1242 int err; 1243 struct p9_client *clnt; 1244 struct p9_req_t *req; 1245 struct p9_qid qid; 1246 int iounit; 1247 1248 clnt = fid->clnt; 1249 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1250 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1251 err = 0; 1252 1253 if (fid->mode != -1) 1254 return -EINVAL; 1255 1256 if (p9_is_proto_dotl(clnt)) 1257 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1258 else 1259 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1260 if (IS_ERR(req)) { 1261 err = PTR_ERR(req); 1262 goto error; 1263 } 1264 1265 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1266 if (err) { 1267 trace_9p_protocol_dump(clnt, &req->rc); 1268 goto free_and_error; 1269 } 1270 1271 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1272 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1273 (unsigned long long)qid.path, qid.version, iounit); 1274 1275 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1276 fid->mode = mode; 1277 fid->iounit = iounit; 1278 1279 free_and_error: 1280 p9_tag_remove(clnt, req); 1281 error: 1282 return err; 1283 } 1284 EXPORT_SYMBOL(p9_client_open); 1285 1286 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode, 1287 kgid_t gid, struct p9_qid *qid) 1288 { 1289 int err = 0; 1290 struct p9_client *clnt; 1291 struct p9_req_t *req; 1292 int iounit; 1293 1294 p9_debug(P9_DEBUG_9P, 1295 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1296 ofid->fid, name, flags, mode, 1297 from_kgid(&init_user_ns, gid)); 1298 clnt = ofid->clnt; 1299 1300 if (ofid->mode != -1) 1301 return -EINVAL; 1302 1303 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1304 mode, gid); 1305 if (IS_ERR(req)) { 1306 err = PTR_ERR(req); 1307 goto error; 1308 } 1309 1310 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); 1311 if (err) { 1312 trace_9p_protocol_dump(clnt, &req->rc); 1313 goto free_and_error; 1314 } 1315 1316 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1317 qid->type, 1318 (unsigned long long)qid->path, 1319 qid->version, iounit); 1320 1321 memmove(&ofid->qid, qid, sizeof(struct p9_qid)); 1322 ofid->mode = mode; 1323 ofid->iounit = iounit; 1324 1325 free_and_error: 1326 p9_tag_remove(clnt, req); 1327 error: 1328 return err; 1329 } 1330 EXPORT_SYMBOL(p9_client_create_dotl); 1331 1332 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1333 char *extension) 1334 { 1335 int err; 1336 struct p9_client *clnt; 1337 struct p9_req_t *req; 1338 struct p9_qid qid; 1339 int iounit; 1340 1341 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1342 fid->fid, name, perm, mode); 1343 err = 0; 1344 clnt = fid->clnt; 1345 1346 if (fid->mode != -1) 1347 return -EINVAL; 1348 1349 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1350 mode, extension); 1351 if (IS_ERR(req)) { 1352 err = PTR_ERR(req); 1353 goto error; 1354 } 1355 1356 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1357 if (err) { 1358 trace_9p_protocol_dump(clnt, &req->rc); 1359 goto free_and_error; 1360 } 1361 1362 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1363 qid.type, 1364 (unsigned long long)qid.path, 1365 qid.version, iounit); 1366 1367 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1368 fid->mode = mode; 1369 fid->iounit = iounit; 1370 1371 free_and_error: 1372 p9_tag_remove(clnt, req); 1373 error: 1374 return err; 1375 } 1376 EXPORT_SYMBOL(p9_client_fcreate); 1377 1378 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1379 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1380 { 1381 int err = 0; 1382 struct p9_client *clnt; 1383 struct p9_req_t *req; 1384 1385 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1386 dfid->fid, name, symtgt); 1387 clnt = dfid->clnt; 1388 1389 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1390 gid); 1391 if (IS_ERR(req)) { 1392 err = PTR_ERR(req); 1393 goto error; 1394 } 1395 1396 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 1397 if (err) { 1398 trace_9p_protocol_dump(clnt, &req->rc); 1399 goto free_and_error; 1400 } 1401 1402 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1403 qid->type, (unsigned long long)qid->path, qid->version); 1404 1405 free_and_error: 1406 p9_tag_remove(clnt, req); 1407 error: 1408 return err; 1409 } 1410 EXPORT_SYMBOL(p9_client_symlink); 1411 1412 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1413 { 1414 struct p9_client *clnt; 1415 struct p9_req_t *req; 1416 1417 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1418 dfid->fid, oldfid->fid, newname); 1419 clnt = dfid->clnt; 1420 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1421 newname); 1422 if (IS_ERR(req)) 1423 return PTR_ERR(req); 1424 1425 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1426 p9_tag_remove(clnt, req); 1427 return 0; 1428 } 1429 EXPORT_SYMBOL(p9_client_link); 1430 1431 int p9_client_fsync(struct p9_fid *fid, int datasync) 1432 { 1433 int err; 1434 struct p9_client *clnt; 1435 struct p9_req_t *req; 1436 1437 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1438 fid->fid, datasync); 1439 err = 0; 1440 clnt = fid->clnt; 1441 1442 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1443 if (IS_ERR(req)) { 1444 err = PTR_ERR(req); 1445 goto error; 1446 } 1447 1448 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1449 1450 p9_tag_remove(clnt, req); 1451 1452 error: 1453 return err; 1454 } 1455 EXPORT_SYMBOL(p9_client_fsync); 1456 1457 int p9_client_clunk(struct p9_fid *fid) 1458 { 1459 int err; 1460 struct p9_client *clnt; 1461 struct p9_req_t *req; 1462 int retries = 0; 1463 1464 if (!fid) { 1465 pr_warn("%s (%d): Trying to clunk with NULL fid\n", 1466 __func__, task_pid_nr(current)); 1467 dump_stack(); 1468 return 0; 1469 } 1470 1471 again: 1472 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid, 1473 retries); 1474 err = 0; 1475 clnt = fid->clnt; 1476 1477 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1478 if (IS_ERR(req)) { 1479 err = PTR_ERR(req); 1480 goto error; 1481 } 1482 1483 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1484 1485 p9_tag_remove(clnt, req); 1486 error: 1487 /* 1488 * Fid is not valid even after a failed clunk 1489 * If interrupted, retry once then give up and 1490 * leak fid until umount. 1491 */ 1492 if (err == -ERESTARTSYS) { 1493 if (retries++ == 0) 1494 goto again; 1495 } else 1496 p9_fid_destroy(fid); 1497 return err; 1498 } 1499 EXPORT_SYMBOL(p9_client_clunk); 1500 1501 int p9_client_remove(struct p9_fid *fid) 1502 { 1503 int err; 1504 struct p9_client *clnt; 1505 struct p9_req_t *req; 1506 1507 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1508 err = 0; 1509 clnt = fid->clnt; 1510 1511 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1512 if (IS_ERR(req)) { 1513 err = PTR_ERR(req); 1514 goto error; 1515 } 1516 1517 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1518 1519 p9_tag_remove(clnt, req); 1520 error: 1521 if (err == -ERESTARTSYS) 1522 p9_client_clunk(fid); 1523 else 1524 p9_fid_destroy(fid); 1525 return err; 1526 } 1527 EXPORT_SYMBOL(p9_client_remove); 1528 1529 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1530 { 1531 int err = 0; 1532 struct p9_req_t *req; 1533 struct p9_client *clnt; 1534 1535 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1536 dfid->fid, name, flags); 1537 1538 clnt = dfid->clnt; 1539 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1540 if (IS_ERR(req)) { 1541 err = PTR_ERR(req); 1542 goto error; 1543 } 1544 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1545 1546 p9_tag_remove(clnt, req); 1547 error: 1548 return err; 1549 } 1550 EXPORT_SYMBOL(p9_client_unlinkat); 1551 1552 int 1553 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1554 { 1555 int total = 0; 1556 *err = 0; 1557 1558 while (iov_iter_count(to)) { 1559 int count; 1560 1561 count = p9_client_read_once(fid, offset, to, err); 1562 if (!count || *err) 1563 break; 1564 offset += count; 1565 total += count; 1566 } 1567 return total; 1568 } 1569 EXPORT_SYMBOL(p9_client_read); 1570 1571 int 1572 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, 1573 int *err) 1574 { 1575 struct p9_client *clnt = fid->clnt; 1576 struct p9_req_t *req; 1577 int count = iov_iter_count(to); 1578 int rsize, non_zc = 0; 1579 char *dataptr; 1580 1581 *err = 0; 1582 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", 1583 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to)); 1584 1585 rsize = fid->iounit; 1586 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1587 rsize = clnt->msize - P9_IOHDRSZ; 1588 1589 if (count < rsize) 1590 rsize = count; 1591 1592 /* Don't bother zerocopy for small IO (< 1024) */ 1593 if (clnt->trans_mod->zc_request && rsize > 1024) { 1594 /* response header len is 11 1595 * PDU Header(7) + IO Size (4) 1596 */ 1597 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1598 0, 11, "dqd", fid->fid, 1599 offset, rsize); 1600 } else { 1601 non_zc = 1; 1602 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1603 rsize); 1604 } 1605 if (IS_ERR(req)) { 1606 *err = PTR_ERR(req); 1607 return 0; 1608 } 1609 1610 *err = p9pdu_readf(&req->rc, clnt->proto_version, 1611 "D", &count, &dataptr); 1612 if (*err) { 1613 trace_9p_protocol_dump(clnt, &req->rc); 1614 p9_tag_remove(clnt, req); 1615 return 0; 1616 } 1617 if (rsize < count) { 1618 pr_err("bogus RREAD count (%d > %d)\n", count, rsize); 1619 count = rsize; 1620 } 1621 1622 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1623 if (!count) { 1624 p9_tag_remove(clnt, req); 1625 return 0; 1626 } 1627 1628 if (non_zc) { 1629 int n = copy_to_iter(dataptr, count, to); 1630 1631 if (n != count) { 1632 *err = -EFAULT; 1633 p9_tag_remove(clnt, req); 1634 return n; 1635 } 1636 } else { 1637 iov_iter_advance(to, count); 1638 } 1639 p9_tag_remove(clnt, req); 1640 return count; 1641 } 1642 EXPORT_SYMBOL(p9_client_read_once); 1643 1644 int 1645 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1646 { 1647 struct p9_client *clnt = fid->clnt; 1648 struct p9_req_t *req; 1649 int total = 0; 1650 *err = 0; 1651 1652 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", 1653 fid->fid, (unsigned long long) offset, 1654 iov_iter_count(from)); 1655 1656 while (iov_iter_count(from)) { 1657 int count = iov_iter_count(from); 1658 int rsize = fid->iounit; 1659 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1660 rsize = clnt->msize - P9_IOHDRSZ; 1661 1662 if (count < rsize) 1663 rsize = count; 1664 1665 /* Don't bother zerocopy for small IO (< 1024) */ 1666 if (clnt->trans_mod->zc_request && rsize > 1024) { 1667 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1668 rsize, P9_ZC_HDR_SZ, "dqd", 1669 fid->fid, offset, rsize); 1670 } else { 1671 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1672 offset, rsize, from); 1673 } 1674 if (IS_ERR(req)) { 1675 *err = PTR_ERR(req); 1676 break; 1677 } 1678 1679 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count); 1680 if (*err) { 1681 trace_9p_protocol_dump(clnt, &req->rc); 1682 p9_tag_remove(clnt, req); 1683 break; 1684 } 1685 if (rsize < count) { 1686 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize); 1687 count = rsize; 1688 } 1689 1690 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1691 1692 p9_tag_remove(clnt, req); 1693 iov_iter_advance(from, count); 1694 total += count; 1695 offset += count; 1696 } 1697 return total; 1698 } 1699 EXPORT_SYMBOL(p9_client_write); 1700 1701 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1702 { 1703 int err; 1704 struct p9_client *clnt; 1705 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1706 struct p9_req_t *req; 1707 u16 ignored; 1708 1709 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1710 1711 if (!ret) 1712 return ERR_PTR(-ENOMEM); 1713 1714 err = 0; 1715 clnt = fid->clnt; 1716 1717 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1718 if (IS_ERR(req)) { 1719 err = PTR_ERR(req); 1720 goto error; 1721 } 1722 1723 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); 1724 if (err) { 1725 trace_9p_protocol_dump(clnt, &req->rc); 1726 p9_tag_remove(clnt, req); 1727 goto error; 1728 } 1729 1730 p9_debug(P9_DEBUG_9P, 1731 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1732 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1733 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1734 "<<< uid=%d gid=%d n_muid=%d\n", 1735 ret->size, ret->type, ret->dev, ret->qid.type, 1736 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1737 ret->atime, ret->mtime, (unsigned long long)ret->length, 1738 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1739 from_kuid(&init_user_ns, ret->n_uid), 1740 from_kgid(&init_user_ns, ret->n_gid), 1741 from_kuid(&init_user_ns, ret->n_muid)); 1742 1743 p9_tag_remove(clnt, req); 1744 return ret; 1745 1746 error: 1747 kfree(ret); 1748 return ERR_PTR(err); 1749 } 1750 EXPORT_SYMBOL(p9_client_stat); 1751 1752 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1753 u64 request_mask) 1754 { 1755 int err; 1756 struct p9_client *clnt; 1757 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1758 GFP_KERNEL); 1759 struct p9_req_t *req; 1760 1761 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1762 fid->fid, request_mask); 1763 1764 if (!ret) 1765 return ERR_PTR(-ENOMEM); 1766 1767 err = 0; 1768 clnt = fid->clnt; 1769 1770 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1771 if (IS_ERR(req)) { 1772 err = PTR_ERR(req); 1773 goto error; 1774 } 1775 1776 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); 1777 if (err) { 1778 trace_9p_protocol_dump(clnt, &req->rc); 1779 p9_tag_remove(clnt, req); 1780 goto error; 1781 } 1782 1783 p9_debug(P9_DEBUG_9P, 1784 "<<< RGETATTR st_result_mask=%lld\n" 1785 "<<< qid=%x.%llx.%x\n" 1786 "<<< st_mode=%8.8x st_nlink=%llu\n" 1787 "<<< st_uid=%d st_gid=%d\n" 1788 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1789 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1790 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1791 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1792 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1793 "<<< st_gen=%lld st_data_version=%lld\n", 1794 ret->st_result_mask, ret->qid.type, ret->qid.path, 1795 ret->qid.version, ret->st_mode, ret->st_nlink, 1796 from_kuid(&init_user_ns, ret->st_uid), 1797 from_kgid(&init_user_ns, ret->st_gid), 1798 ret->st_rdev, ret->st_size, ret->st_blksize, 1799 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1800 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1801 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1802 ret->st_gen, ret->st_data_version); 1803 1804 p9_tag_remove(clnt, req); 1805 return ret; 1806 1807 error: 1808 kfree(ret); 1809 return ERR_PTR(err); 1810 } 1811 EXPORT_SYMBOL(p9_client_getattr_dotl); 1812 1813 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1814 { 1815 int ret; 1816 1817 /* NOTE: size shouldn't include its own length */ 1818 /* size[2] type[2] dev[4] qid[13] */ 1819 /* mode[4] atime[4] mtime[4] length[8]*/ 1820 /* name[s] uid[s] gid[s] muid[s] */ 1821 ret = 2+4+13+4+4+4+8+2+2+2+2; 1822 1823 if (wst->name) 1824 ret += strlen(wst->name); 1825 if (wst->uid) 1826 ret += strlen(wst->uid); 1827 if (wst->gid) 1828 ret += strlen(wst->gid); 1829 if (wst->muid) 1830 ret += strlen(wst->muid); 1831 1832 if ((proto_version == p9_proto_2000u) || 1833 (proto_version == p9_proto_2000L)) { 1834 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1835 if (wst->extension) 1836 ret += strlen(wst->extension); 1837 } 1838 1839 return ret; 1840 } 1841 1842 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1843 { 1844 int err; 1845 struct p9_req_t *req; 1846 struct p9_client *clnt; 1847 1848 err = 0; 1849 clnt = fid->clnt; 1850 wst->size = p9_client_statsize(wst, clnt->proto_version); 1851 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1852 p9_debug(P9_DEBUG_9P, 1853 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1854 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1855 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1856 " uid=%d gid=%d n_muid=%d\n", 1857 wst->size, wst->type, wst->dev, wst->qid.type, 1858 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1859 wst->atime, wst->mtime, (unsigned long long)wst->length, 1860 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1861 from_kuid(&init_user_ns, wst->n_uid), 1862 from_kgid(&init_user_ns, wst->n_gid), 1863 from_kuid(&init_user_ns, wst->n_muid)); 1864 1865 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1866 if (IS_ERR(req)) { 1867 err = PTR_ERR(req); 1868 goto error; 1869 } 1870 1871 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1872 1873 p9_tag_remove(clnt, req); 1874 error: 1875 return err; 1876 } 1877 EXPORT_SYMBOL(p9_client_wstat); 1878 1879 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1880 { 1881 int err; 1882 struct p9_req_t *req; 1883 struct p9_client *clnt; 1884 1885 err = 0; 1886 clnt = fid->clnt; 1887 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1888 p9_debug(P9_DEBUG_9P, 1889 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1890 " atime_sec=%lld atime_nsec=%lld\n" 1891 " mtime_sec=%lld mtime_nsec=%lld\n", 1892 p9attr->valid, p9attr->mode, 1893 from_kuid(&init_user_ns, p9attr->uid), 1894 from_kgid(&init_user_ns, p9attr->gid), 1895 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1896 p9attr->mtime_sec, p9attr->mtime_nsec); 1897 1898 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1899 1900 if (IS_ERR(req)) { 1901 err = PTR_ERR(req); 1902 goto error; 1903 } 1904 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1905 p9_tag_remove(clnt, req); 1906 error: 1907 return err; 1908 } 1909 EXPORT_SYMBOL(p9_client_setattr); 1910 1911 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1912 { 1913 int err; 1914 struct p9_req_t *req; 1915 struct p9_client *clnt; 1916 1917 err = 0; 1918 clnt = fid->clnt; 1919 1920 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1921 1922 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1923 if (IS_ERR(req)) { 1924 err = PTR_ERR(req); 1925 goto error; 1926 } 1927 1928 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1929 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1930 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1931 if (err) { 1932 trace_9p_protocol_dump(clnt, &req->rc); 1933 p9_tag_remove(clnt, req); 1934 goto error; 1935 } 1936 1937 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1938 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1939 "fsid %llu namelen %ld\n", 1940 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1941 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1942 sb->fsid, (long int)sb->namelen); 1943 1944 p9_tag_remove(clnt, req); 1945 error: 1946 return err; 1947 } 1948 EXPORT_SYMBOL(p9_client_statfs); 1949 1950 int p9_client_rename(struct p9_fid *fid, 1951 struct p9_fid *newdirfid, const char *name) 1952 { 1953 int err; 1954 struct p9_req_t *req; 1955 struct p9_client *clnt; 1956 1957 err = 0; 1958 clnt = fid->clnt; 1959 1960 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1961 fid->fid, newdirfid->fid, name); 1962 1963 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1964 newdirfid->fid, name); 1965 if (IS_ERR(req)) { 1966 err = PTR_ERR(req); 1967 goto error; 1968 } 1969 1970 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1971 1972 p9_tag_remove(clnt, req); 1973 error: 1974 return err; 1975 } 1976 EXPORT_SYMBOL(p9_client_rename); 1977 1978 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1979 struct p9_fid *newdirfid, const char *new_name) 1980 { 1981 int err; 1982 struct p9_req_t *req; 1983 struct p9_client *clnt; 1984 1985 err = 0; 1986 clnt = olddirfid->clnt; 1987 1988 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" 1989 " newdirfid %d new name %s\n", olddirfid->fid, old_name, 1990 newdirfid->fid, new_name); 1991 1992 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1993 old_name, newdirfid->fid, new_name); 1994 if (IS_ERR(req)) { 1995 err = PTR_ERR(req); 1996 goto error; 1997 } 1998 1999 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 2000 newdirfid->fid, new_name); 2001 2002 p9_tag_remove(clnt, req); 2003 error: 2004 return err; 2005 } 2006 EXPORT_SYMBOL(p9_client_renameat); 2007 2008 /* 2009 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 2010 */ 2011 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 2012 const char *attr_name, u64 *attr_size) 2013 { 2014 int err; 2015 struct p9_req_t *req; 2016 struct p9_client *clnt; 2017 struct p9_fid *attr_fid; 2018 2019 err = 0; 2020 clnt = file_fid->clnt; 2021 attr_fid = p9_fid_create(clnt); 2022 if (!attr_fid) { 2023 err = -ENOMEM; 2024 goto error; 2025 } 2026 p9_debug(P9_DEBUG_9P, 2027 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 2028 file_fid->fid, attr_fid->fid, attr_name); 2029 2030 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 2031 file_fid->fid, attr_fid->fid, attr_name); 2032 if (IS_ERR(req)) { 2033 err = PTR_ERR(req); 2034 goto error; 2035 } 2036 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); 2037 if (err) { 2038 trace_9p_protocol_dump(clnt, &req->rc); 2039 p9_tag_remove(clnt, req); 2040 goto clunk_fid; 2041 } 2042 p9_tag_remove(clnt, req); 2043 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2044 attr_fid->fid, *attr_size); 2045 return attr_fid; 2046 clunk_fid: 2047 p9_client_clunk(attr_fid); 2048 attr_fid = NULL; 2049 error: 2050 if (attr_fid && (attr_fid != file_fid)) 2051 p9_fid_destroy(attr_fid); 2052 2053 return ERR_PTR(err); 2054 } 2055 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2056 2057 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2058 u64 attr_size, int flags) 2059 { 2060 int err; 2061 struct p9_req_t *req; 2062 struct p9_client *clnt; 2063 2064 p9_debug(P9_DEBUG_9P, 2065 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 2066 fid->fid, name, (long long)attr_size, flags); 2067 err = 0; 2068 clnt = fid->clnt; 2069 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2070 fid->fid, name, attr_size, flags); 2071 if (IS_ERR(req)) { 2072 err = PTR_ERR(req); 2073 goto error; 2074 } 2075 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2076 p9_tag_remove(clnt, req); 2077 error: 2078 return err; 2079 } 2080 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2081 2082 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2083 { 2084 int err, rsize, non_zc = 0; 2085 struct p9_client *clnt; 2086 struct p9_req_t *req; 2087 char *dataptr; 2088 struct kvec kv = {.iov_base = data, .iov_len = count}; 2089 struct iov_iter to; 2090 2091 iov_iter_kvec(&to, READ, &kv, 1, count); 2092 2093 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2094 fid->fid, (unsigned long long) offset, count); 2095 2096 err = 0; 2097 clnt = fid->clnt; 2098 2099 rsize = fid->iounit; 2100 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 2101 rsize = clnt->msize - P9_READDIRHDRSZ; 2102 2103 if (count < rsize) 2104 rsize = count; 2105 2106 /* Don't bother zerocopy for small IO (< 1024) */ 2107 if (clnt->trans_mod->zc_request && rsize > 1024) { 2108 /* 2109 * response header len is 11 2110 * PDU Header(7) + IO Size (4) 2111 */ 2112 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2113 11, "dqd", fid->fid, offset, rsize); 2114 } else { 2115 non_zc = 1; 2116 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2117 offset, rsize); 2118 } 2119 if (IS_ERR(req)) { 2120 err = PTR_ERR(req); 2121 goto error; 2122 } 2123 2124 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); 2125 if (err) { 2126 trace_9p_protocol_dump(clnt, &req->rc); 2127 goto free_and_error; 2128 } 2129 if (rsize < count) { 2130 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2131 count = rsize; 2132 } 2133 2134 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2135 2136 if (non_zc) 2137 memmove(data, dataptr, count); 2138 2139 p9_tag_remove(clnt, req); 2140 return count; 2141 2142 free_and_error: 2143 p9_tag_remove(clnt, req); 2144 error: 2145 return err; 2146 } 2147 EXPORT_SYMBOL(p9_client_readdir); 2148 2149 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2150 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2151 { 2152 int err; 2153 struct p9_client *clnt; 2154 struct p9_req_t *req; 2155 2156 err = 0; 2157 clnt = fid->clnt; 2158 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 2159 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2160 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2161 MAJOR(rdev), MINOR(rdev), gid); 2162 if (IS_ERR(req)) 2163 return PTR_ERR(req); 2164 2165 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2166 if (err) { 2167 trace_9p_protocol_dump(clnt, &req->rc); 2168 goto error; 2169 } 2170 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 2171 (unsigned long long)qid->path, qid->version); 2172 2173 error: 2174 p9_tag_remove(clnt, req); 2175 return err; 2176 2177 } 2178 EXPORT_SYMBOL(p9_client_mknod_dotl); 2179 2180 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2181 kgid_t gid, struct p9_qid *qid) 2182 { 2183 int err; 2184 struct p9_client *clnt; 2185 struct p9_req_t *req; 2186 2187 err = 0; 2188 clnt = fid->clnt; 2189 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2190 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2191 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode, 2192 gid); 2193 if (IS_ERR(req)) 2194 return PTR_ERR(req); 2195 2196 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2197 if (err) { 2198 trace_9p_protocol_dump(clnt, &req->rc); 2199 goto error; 2200 } 2201 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2202 (unsigned long long)qid->path, qid->version); 2203 2204 error: 2205 p9_tag_remove(clnt, req); 2206 return err; 2207 2208 } 2209 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2210 2211 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2212 { 2213 int err; 2214 struct p9_client *clnt; 2215 struct p9_req_t *req; 2216 2217 err = 0; 2218 clnt = fid->clnt; 2219 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " 2220 "start %lld length %lld proc_id %d client_id %s\n", 2221 fid->fid, flock->type, flock->flags, flock->start, 2222 flock->length, flock->proc_id, flock->client_id); 2223 2224 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2225 flock->flags, flock->start, flock->length, 2226 flock->proc_id, flock->client_id); 2227 2228 if (IS_ERR(req)) 2229 return PTR_ERR(req); 2230 2231 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); 2232 if (err) { 2233 trace_9p_protocol_dump(clnt, &req->rc); 2234 goto error; 2235 } 2236 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2237 error: 2238 p9_tag_remove(clnt, req); 2239 return err; 2240 2241 } 2242 EXPORT_SYMBOL(p9_client_lock_dotl); 2243 2244 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2245 { 2246 int err; 2247 struct p9_client *clnt; 2248 struct p9_req_t *req; 2249 2250 err = 0; 2251 clnt = fid->clnt; 2252 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " 2253 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, 2254 glock->start, glock->length, glock->proc_id, glock->client_id); 2255 2256 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, 2257 glock->start, glock->length, glock->proc_id, glock->client_id); 2258 2259 if (IS_ERR(req)) 2260 return PTR_ERR(req); 2261 2262 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, 2263 &glock->start, &glock->length, &glock->proc_id, 2264 &glock->client_id); 2265 if (err) { 2266 trace_9p_protocol_dump(clnt, &req->rc); 2267 goto error; 2268 } 2269 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " 2270 "proc_id %d client_id %s\n", glock->type, glock->start, 2271 glock->length, glock->proc_id, glock->client_id); 2272 error: 2273 p9_tag_remove(clnt, req); 2274 return err; 2275 } 2276 EXPORT_SYMBOL(p9_client_getlock_dotl); 2277 2278 int p9_client_readlink(struct p9_fid *fid, char **target) 2279 { 2280 int err; 2281 struct p9_client *clnt; 2282 struct p9_req_t *req; 2283 2284 err = 0; 2285 clnt = fid->clnt; 2286 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2287 2288 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2289 if (IS_ERR(req)) 2290 return PTR_ERR(req); 2291 2292 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); 2293 if (err) { 2294 trace_9p_protocol_dump(clnt, &req->rc); 2295 goto error; 2296 } 2297 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2298 error: 2299 p9_tag_remove(clnt, req); 2300 return err; 2301 } 2302 EXPORT_SYMBOL(p9_client_readlink); 2303 2304 int __init p9_client_init(void) 2305 { 2306 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); 2307 return p9_req_cache ? 0 : -ENOMEM; 2308 } 2309 2310 void __exit p9_client_exit(void) 2311 { 2312 kmem_cache_destroy(p9_req_cache); 2313 } 2314