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 fid->qid = oldfid->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 fid->mode = mode; 1276 fid->iounit = iounit; 1277 1278 free_and_error: 1279 p9_tag_remove(clnt, req); 1280 error: 1281 return err; 1282 } 1283 EXPORT_SYMBOL(p9_client_open); 1284 1285 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode, 1286 kgid_t gid, struct p9_qid *qid) 1287 { 1288 int err = 0; 1289 struct p9_client *clnt; 1290 struct p9_req_t *req; 1291 int iounit; 1292 1293 p9_debug(P9_DEBUG_9P, 1294 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1295 ofid->fid, name, flags, mode, 1296 from_kgid(&init_user_ns, gid)); 1297 clnt = ofid->clnt; 1298 1299 if (ofid->mode != -1) 1300 return -EINVAL; 1301 1302 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1303 mode, gid); 1304 if (IS_ERR(req)) { 1305 err = PTR_ERR(req); 1306 goto error; 1307 } 1308 1309 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); 1310 if (err) { 1311 trace_9p_protocol_dump(clnt, &req->rc); 1312 goto free_and_error; 1313 } 1314 1315 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1316 qid->type, 1317 (unsigned long long)qid->path, 1318 qid->version, iounit); 1319 1320 ofid->mode = mode; 1321 ofid->iounit = iounit; 1322 1323 free_and_error: 1324 p9_tag_remove(clnt, req); 1325 error: 1326 return err; 1327 } 1328 EXPORT_SYMBOL(p9_client_create_dotl); 1329 1330 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1331 char *extension) 1332 { 1333 int err; 1334 struct p9_client *clnt; 1335 struct p9_req_t *req; 1336 struct p9_qid qid; 1337 int iounit; 1338 1339 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1340 fid->fid, name, perm, mode); 1341 err = 0; 1342 clnt = fid->clnt; 1343 1344 if (fid->mode != -1) 1345 return -EINVAL; 1346 1347 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1348 mode, extension); 1349 if (IS_ERR(req)) { 1350 err = PTR_ERR(req); 1351 goto error; 1352 } 1353 1354 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1355 if (err) { 1356 trace_9p_protocol_dump(clnt, &req->rc); 1357 goto free_and_error; 1358 } 1359 1360 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1361 qid.type, 1362 (unsigned long long)qid.path, 1363 qid.version, iounit); 1364 1365 fid->mode = mode; 1366 fid->iounit = iounit; 1367 1368 free_and_error: 1369 p9_tag_remove(clnt, req); 1370 error: 1371 return err; 1372 } 1373 EXPORT_SYMBOL(p9_client_fcreate); 1374 1375 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1376 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1377 { 1378 int err = 0; 1379 struct p9_client *clnt; 1380 struct p9_req_t *req; 1381 1382 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1383 dfid->fid, name, symtgt); 1384 clnt = dfid->clnt; 1385 1386 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1387 gid); 1388 if (IS_ERR(req)) { 1389 err = PTR_ERR(req); 1390 goto error; 1391 } 1392 1393 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 1394 if (err) { 1395 trace_9p_protocol_dump(clnt, &req->rc); 1396 goto free_and_error; 1397 } 1398 1399 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1400 qid->type, (unsigned long long)qid->path, qid->version); 1401 1402 free_and_error: 1403 p9_tag_remove(clnt, req); 1404 error: 1405 return err; 1406 } 1407 EXPORT_SYMBOL(p9_client_symlink); 1408 1409 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1410 { 1411 struct p9_client *clnt; 1412 struct p9_req_t *req; 1413 1414 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1415 dfid->fid, oldfid->fid, newname); 1416 clnt = dfid->clnt; 1417 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1418 newname); 1419 if (IS_ERR(req)) 1420 return PTR_ERR(req); 1421 1422 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1423 p9_tag_remove(clnt, req); 1424 return 0; 1425 } 1426 EXPORT_SYMBOL(p9_client_link); 1427 1428 int p9_client_fsync(struct p9_fid *fid, int datasync) 1429 { 1430 int err; 1431 struct p9_client *clnt; 1432 struct p9_req_t *req; 1433 1434 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1435 fid->fid, datasync); 1436 err = 0; 1437 clnt = fid->clnt; 1438 1439 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1440 if (IS_ERR(req)) { 1441 err = PTR_ERR(req); 1442 goto error; 1443 } 1444 1445 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1446 1447 p9_tag_remove(clnt, req); 1448 1449 error: 1450 return err; 1451 } 1452 EXPORT_SYMBOL(p9_client_fsync); 1453 1454 int p9_client_clunk(struct p9_fid *fid) 1455 { 1456 int err; 1457 struct p9_client *clnt; 1458 struct p9_req_t *req; 1459 int retries = 0; 1460 1461 if (!fid) { 1462 pr_warn("%s (%d): Trying to clunk with NULL fid\n", 1463 __func__, task_pid_nr(current)); 1464 dump_stack(); 1465 return 0; 1466 } 1467 1468 again: 1469 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid, 1470 retries); 1471 err = 0; 1472 clnt = fid->clnt; 1473 1474 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1475 if (IS_ERR(req)) { 1476 err = PTR_ERR(req); 1477 goto error; 1478 } 1479 1480 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1481 1482 p9_tag_remove(clnt, req); 1483 error: 1484 /* 1485 * Fid is not valid even after a failed clunk 1486 * If interrupted, retry once then give up and 1487 * leak fid until umount. 1488 */ 1489 if (err == -ERESTARTSYS) { 1490 if (retries++ == 0) 1491 goto again; 1492 } else 1493 p9_fid_destroy(fid); 1494 return err; 1495 } 1496 EXPORT_SYMBOL(p9_client_clunk); 1497 1498 int p9_client_remove(struct p9_fid *fid) 1499 { 1500 int err; 1501 struct p9_client *clnt; 1502 struct p9_req_t *req; 1503 1504 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1505 err = 0; 1506 clnt = fid->clnt; 1507 1508 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1509 if (IS_ERR(req)) { 1510 err = PTR_ERR(req); 1511 goto error; 1512 } 1513 1514 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1515 1516 p9_tag_remove(clnt, req); 1517 error: 1518 if (err == -ERESTARTSYS) 1519 p9_client_clunk(fid); 1520 else 1521 p9_fid_destroy(fid); 1522 return err; 1523 } 1524 EXPORT_SYMBOL(p9_client_remove); 1525 1526 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1527 { 1528 int err = 0; 1529 struct p9_req_t *req; 1530 struct p9_client *clnt; 1531 1532 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1533 dfid->fid, name, flags); 1534 1535 clnt = dfid->clnt; 1536 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1537 if (IS_ERR(req)) { 1538 err = PTR_ERR(req); 1539 goto error; 1540 } 1541 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1542 1543 p9_tag_remove(clnt, req); 1544 error: 1545 return err; 1546 } 1547 EXPORT_SYMBOL(p9_client_unlinkat); 1548 1549 int 1550 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1551 { 1552 int total = 0; 1553 *err = 0; 1554 1555 while (iov_iter_count(to)) { 1556 int count; 1557 1558 count = p9_client_read_once(fid, offset, to, err); 1559 if (!count || *err) 1560 break; 1561 offset += count; 1562 total += count; 1563 } 1564 return total; 1565 } 1566 EXPORT_SYMBOL(p9_client_read); 1567 1568 int 1569 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, 1570 int *err) 1571 { 1572 struct p9_client *clnt = fid->clnt; 1573 struct p9_req_t *req; 1574 int count = iov_iter_count(to); 1575 int rsize, non_zc = 0; 1576 char *dataptr; 1577 1578 *err = 0; 1579 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", 1580 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to)); 1581 1582 rsize = fid->iounit; 1583 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1584 rsize = clnt->msize - P9_IOHDRSZ; 1585 1586 if (count < rsize) 1587 rsize = count; 1588 1589 /* Don't bother zerocopy for small IO (< 1024) */ 1590 if (clnt->trans_mod->zc_request && rsize > 1024) { 1591 /* response header len is 11 1592 * PDU Header(7) + IO Size (4) 1593 */ 1594 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1595 0, 11, "dqd", fid->fid, 1596 offset, rsize); 1597 } else { 1598 non_zc = 1; 1599 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1600 rsize); 1601 } 1602 if (IS_ERR(req)) { 1603 *err = PTR_ERR(req); 1604 return 0; 1605 } 1606 1607 *err = p9pdu_readf(&req->rc, clnt->proto_version, 1608 "D", &count, &dataptr); 1609 if (*err) { 1610 trace_9p_protocol_dump(clnt, &req->rc); 1611 p9_tag_remove(clnt, req); 1612 return 0; 1613 } 1614 if (rsize < count) { 1615 pr_err("bogus RREAD count (%d > %d)\n", count, rsize); 1616 count = rsize; 1617 } 1618 1619 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1620 if (!count) { 1621 p9_tag_remove(clnt, req); 1622 return 0; 1623 } 1624 1625 if (non_zc) { 1626 int n = copy_to_iter(dataptr, count, to); 1627 1628 if (n != count) { 1629 *err = -EFAULT; 1630 p9_tag_remove(clnt, req); 1631 return n; 1632 } 1633 } else { 1634 iov_iter_advance(to, count); 1635 } 1636 p9_tag_remove(clnt, req); 1637 return count; 1638 } 1639 EXPORT_SYMBOL(p9_client_read_once); 1640 1641 int 1642 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1643 { 1644 struct p9_client *clnt = fid->clnt; 1645 struct p9_req_t *req; 1646 int total = 0; 1647 *err = 0; 1648 1649 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", 1650 fid->fid, (unsigned long long) offset, 1651 iov_iter_count(from)); 1652 1653 while (iov_iter_count(from)) { 1654 int count = iov_iter_count(from); 1655 int rsize = fid->iounit; 1656 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1657 rsize = clnt->msize - P9_IOHDRSZ; 1658 1659 if (count < rsize) 1660 rsize = count; 1661 1662 /* Don't bother zerocopy for small IO (< 1024) */ 1663 if (clnt->trans_mod->zc_request && rsize > 1024) { 1664 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1665 rsize, P9_ZC_HDR_SZ, "dqd", 1666 fid->fid, offset, rsize); 1667 } else { 1668 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1669 offset, rsize, from); 1670 } 1671 if (IS_ERR(req)) { 1672 *err = PTR_ERR(req); 1673 break; 1674 } 1675 1676 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count); 1677 if (*err) { 1678 trace_9p_protocol_dump(clnt, &req->rc); 1679 p9_tag_remove(clnt, req); 1680 break; 1681 } 1682 if (rsize < count) { 1683 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize); 1684 count = rsize; 1685 } 1686 1687 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1688 1689 p9_tag_remove(clnt, req); 1690 iov_iter_advance(from, count); 1691 total += count; 1692 offset += count; 1693 } 1694 return total; 1695 } 1696 EXPORT_SYMBOL(p9_client_write); 1697 1698 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1699 { 1700 int err; 1701 struct p9_client *clnt; 1702 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1703 struct p9_req_t *req; 1704 u16 ignored; 1705 1706 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1707 1708 if (!ret) 1709 return ERR_PTR(-ENOMEM); 1710 1711 err = 0; 1712 clnt = fid->clnt; 1713 1714 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1715 if (IS_ERR(req)) { 1716 err = PTR_ERR(req); 1717 goto error; 1718 } 1719 1720 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); 1721 if (err) { 1722 trace_9p_protocol_dump(clnt, &req->rc); 1723 p9_tag_remove(clnt, req); 1724 goto error; 1725 } 1726 1727 p9_debug(P9_DEBUG_9P, 1728 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1729 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1730 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1731 "<<< uid=%d gid=%d n_muid=%d\n", 1732 ret->size, ret->type, ret->dev, ret->qid.type, 1733 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1734 ret->atime, ret->mtime, (unsigned long long)ret->length, 1735 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1736 from_kuid(&init_user_ns, ret->n_uid), 1737 from_kgid(&init_user_ns, ret->n_gid), 1738 from_kuid(&init_user_ns, ret->n_muid)); 1739 1740 p9_tag_remove(clnt, req); 1741 return ret; 1742 1743 error: 1744 kfree(ret); 1745 return ERR_PTR(err); 1746 } 1747 EXPORT_SYMBOL(p9_client_stat); 1748 1749 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1750 u64 request_mask) 1751 { 1752 int err; 1753 struct p9_client *clnt; 1754 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1755 GFP_KERNEL); 1756 struct p9_req_t *req; 1757 1758 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1759 fid->fid, request_mask); 1760 1761 if (!ret) 1762 return ERR_PTR(-ENOMEM); 1763 1764 err = 0; 1765 clnt = fid->clnt; 1766 1767 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1768 if (IS_ERR(req)) { 1769 err = PTR_ERR(req); 1770 goto error; 1771 } 1772 1773 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); 1774 if (err) { 1775 trace_9p_protocol_dump(clnt, &req->rc); 1776 p9_tag_remove(clnt, req); 1777 goto error; 1778 } 1779 1780 p9_debug(P9_DEBUG_9P, 1781 "<<< RGETATTR st_result_mask=%lld\n" 1782 "<<< qid=%x.%llx.%x\n" 1783 "<<< st_mode=%8.8x st_nlink=%llu\n" 1784 "<<< st_uid=%d st_gid=%d\n" 1785 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1786 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1787 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1788 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1789 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1790 "<<< st_gen=%lld st_data_version=%lld\n", 1791 ret->st_result_mask, ret->qid.type, ret->qid.path, 1792 ret->qid.version, ret->st_mode, ret->st_nlink, 1793 from_kuid(&init_user_ns, ret->st_uid), 1794 from_kgid(&init_user_ns, ret->st_gid), 1795 ret->st_rdev, ret->st_size, ret->st_blksize, 1796 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1797 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1798 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1799 ret->st_gen, ret->st_data_version); 1800 1801 p9_tag_remove(clnt, req); 1802 return ret; 1803 1804 error: 1805 kfree(ret); 1806 return ERR_PTR(err); 1807 } 1808 EXPORT_SYMBOL(p9_client_getattr_dotl); 1809 1810 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1811 { 1812 int ret; 1813 1814 /* NOTE: size shouldn't include its own length */ 1815 /* size[2] type[2] dev[4] qid[13] */ 1816 /* mode[4] atime[4] mtime[4] length[8]*/ 1817 /* name[s] uid[s] gid[s] muid[s] */ 1818 ret = 2+4+13+4+4+4+8+2+2+2+2; 1819 1820 if (wst->name) 1821 ret += strlen(wst->name); 1822 if (wst->uid) 1823 ret += strlen(wst->uid); 1824 if (wst->gid) 1825 ret += strlen(wst->gid); 1826 if (wst->muid) 1827 ret += strlen(wst->muid); 1828 1829 if ((proto_version == p9_proto_2000u) || 1830 (proto_version == p9_proto_2000L)) { 1831 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1832 if (wst->extension) 1833 ret += strlen(wst->extension); 1834 } 1835 1836 return ret; 1837 } 1838 1839 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1840 { 1841 int err; 1842 struct p9_req_t *req; 1843 struct p9_client *clnt; 1844 1845 err = 0; 1846 clnt = fid->clnt; 1847 wst->size = p9_client_statsize(wst, clnt->proto_version); 1848 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1849 p9_debug(P9_DEBUG_9P, 1850 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1851 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1852 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1853 " uid=%d gid=%d n_muid=%d\n", 1854 wst->size, wst->type, wst->dev, wst->qid.type, 1855 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1856 wst->atime, wst->mtime, (unsigned long long)wst->length, 1857 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1858 from_kuid(&init_user_ns, wst->n_uid), 1859 from_kgid(&init_user_ns, wst->n_gid), 1860 from_kuid(&init_user_ns, wst->n_muid)); 1861 1862 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1863 if (IS_ERR(req)) { 1864 err = PTR_ERR(req); 1865 goto error; 1866 } 1867 1868 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1869 1870 p9_tag_remove(clnt, req); 1871 error: 1872 return err; 1873 } 1874 EXPORT_SYMBOL(p9_client_wstat); 1875 1876 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1877 { 1878 int err; 1879 struct p9_req_t *req; 1880 struct p9_client *clnt; 1881 1882 err = 0; 1883 clnt = fid->clnt; 1884 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1885 p9_debug(P9_DEBUG_9P, 1886 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1887 " atime_sec=%lld atime_nsec=%lld\n" 1888 " mtime_sec=%lld mtime_nsec=%lld\n", 1889 p9attr->valid, p9attr->mode, 1890 from_kuid(&init_user_ns, p9attr->uid), 1891 from_kgid(&init_user_ns, p9attr->gid), 1892 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1893 p9attr->mtime_sec, p9attr->mtime_nsec); 1894 1895 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1896 1897 if (IS_ERR(req)) { 1898 err = PTR_ERR(req); 1899 goto error; 1900 } 1901 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1902 p9_tag_remove(clnt, req); 1903 error: 1904 return err; 1905 } 1906 EXPORT_SYMBOL(p9_client_setattr); 1907 1908 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1909 { 1910 int err; 1911 struct p9_req_t *req; 1912 struct p9_client *clnt; 1913 1914 err = 0; 1915 clnt = fid->clnt; 1916 1917 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1918 1919 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1920 if (IS_ERR(req)) { 1921 err = PTR_ERR(req); 1922 goto error; 1923 } 1924 1925 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1926 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1927 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1928 if (err) { 1929 trace_9p_protocol_dump(clnt, &req->rc); 1930 p9_tag_remove(clnt, req); 1931 goto error; 1932 } 1933 1934 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1935 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1936 "fsid %llu namelen %ld\n", 1937 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1938 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1939 sb->fsid, (long int)sb->namelen); 1940 1941 p9_tag_remove(clnt, req); 1942 error: 1943 return err; 1944 } 1945 EXPORT_SYMBOL(p9_client_statfs); 1946 1947 int p9_client_rename(struct p9_fid *fid, 1948 struct p9_fid *newdirfid, const char *name) 1949 { 1950 int err; 1951 struct p9_req_t *req; 1952 struct p9_client *clnt; 1953 1954 err = 0; 1955 clnt = fid->clnt; 1956 1957 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1958 fid->fid, newdirfid->fid, name); 1959 1960 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1961 newdirfid->fid, name); 1962 if (IS_ERR(req)) { 1963 err = PTR_ERR(req); 1964 goto error; 1965 } 1966 1967 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1968 1969 p9_tag_remove(clnt, req); 1970 error: 1971 return err; 1972 } 1973 EXPORT_SYMBOL(p9_client_rename); 1974 1975 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1976 struct p9_fid *newdirfid, const char *new_name) 1977 { 1978 int err; 1979 struct p9_req_t *req; 1980 struct p9_client *clnt; 1981 1982 err = 0; 1983 clnt = olddirfid->clnt; 1984 1985 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" 1986 " newdirfid %d new name %s\n", olddirfid->fid, old_name, 1987 newdirfid->fid, new_name); 1988 1989 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1990 old_name, newdirfid->fid, new_name); 1991 if (IS_ERR(req)) { 1992 err = PTR_ERR(req); 1993 goto error; 1994 } 1995 1996 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1997 newdirfid->fid, new_name); 1998 1999 p9_tag_remove(clnt, req); 2000 error: 2001 return err; 2002 } 2003 EXPORT_SYMBOL(p9_client_renameat); 2004 2005 /* 2006 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 2007 */ 2008 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 2009 const char *attr_name, u64 *attr_size) 2010 { 2011 int err; 2012 struct p9_req_t *req; 2013 struct p9_client *clnt; 2014 struct p9_fid *attr_fid; 2015 2016 err = 0; 2017 clnt = file_fid->clnt; 2018 attr_fid = p9_fid_create(clnt); 2019 if (!attr_fid) { 2020 err = -ENOMEM; 2021 goto error; 2022 } 2023 p9_debug(P9_DEBUG_9P, 2024 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 2025 file_fid->fid, attr_fid->fid, attr_name); 2026 2027 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 2028 file_fid->fid, attr_fid->fid, attr_name); 2029 if (IS_ERR(req)) { 2030 err = PTR_ERR(req); 2031 goto error; 2032 } 2033 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); 2034 if (err) { 2035 trace_9p_protocol_dump(clnt, &req->rc); 2036 p9_tag_remove(clnt, req); 2037 goto clunk_fid; 2038 } 2039 p9_tag_remove(clnt, req); 2040 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2041 attr_fid->fid, *attr_size); 2042 return attr_fid; 2043 clunk_fid: 2044 p9_client_clunk(attr_fid); 2045 attr_fid = NULL; 2046 error: 2047 if (attr_fid && (attr_fid != file_fid)) 2048 p9_fid_destroy(attr_fid); 2049 2050 return ERR_PTR(err); 2051 } 2052 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2053 2054 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2055 u64 attr_size, int flags) 2056 { 2057 int err; 2058 struct p9_req_t *req; 2059 struct p9_client *clnt; 2060 2061 p9_debug(P9_DEBUG_9P, 2062 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 2063 fid->fid, name, (long long)attr_size, flags); 2064 err = 0; 2065 clnt = fid->clnt; 2066 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2067 fid->fid, name, attr_size, flags); 2068 if (IS_ERR(req)) { 2069 err = PTR_ERR(req); 2070 goto error; 2071 } 2072 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2073 p9_tag_remove(clnt, req); 2074 error: 2075 return err; 2076 } 2077 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2078 2079 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2080 { 2081 int err, rsize, non_zc = 0; 2082 struct p9_client *clnt; 2083 struct p9_req_t *req; 2084 char *dataptr; 2085 struct kvec kv = {.iov_base = data, .iov_len = count}; 2086 struct iov_iter to; 2087 2088 iov_iter_kvec(&to, READ, &kv, 1, count); 2089 2090 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2091 fid->fid, (unsigned long long) offset, count); 2092 2093 err = 0; 2094 clnt = fid->clnt; 2095 2096 rsize = fid->iounit; 2097 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 2098 rsize = clnt->msize - P9_READDIRHDRSZ; 2099 2100 if (count < rsize) 2101 rsize = count; 2102 2103 /* Don't bother zerocopy for small IO (< 1024) */ 2104 if (clnt->trans_mod->zc_request && rsize > 1024) { 2105 /* 2106 * response header len is 11 2107 * PDU Header(7) + IO Size (4) 2108 */ 2109 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2110 11, "dqd", fid->fid, offset, rsize); 2111 } else { 2112 non_zc = 1; 2113 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2114 offset, rsize); 2115 } 2116 if (IS_ERR(req)) { 2117 err = PTR_ERR(req); 2118 goto error; 2119 } 2120 2121 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); 2122 if (err) { 2123 trace_9p_protocol_dump(clnt, &req->rc); 2124 goto free_and_error; 2125 } 2126 if (rsize < count) { 2127 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2128 count = rsize; 2129 } 2130 2131 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2132 2133 if (non_zc) 2134 memmove(data, dataptr, count); 2135 2136 p9_tag_remove(clnt, req); 2137 return count; 2138 2139 free_and_error: 2140 p9_tag_remove(clnt, req); 2141 error: 2142 return err; 2143 } 2144 EXPORT_SYMBOL(p9_client_readdir); 2145 2146 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2147 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2148 { 2149 int err; 2150 struct p9_client *clnt; 2151 struct p9_req_t *req; 2152 2153 err = 0; 2154 clnt = fid->clnt; 2155 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 2156 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2157 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2158 MAJOR(rdev), MINOR(rdev), gid); 2159 if (IS_ERR(req)) 2160 return PTR_ERR(req); 2161 2162 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2163 if (err) { 2164 trace_9p_protocol_dump(clnt, &req->rc); 2165 goto error; 2166 } 2167 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 2168 (unsigned long long)qid->path, qid->version); 2169 2170 error: 2171 p9_tag_remove(clnt, req); 2172 return err; 2173 2174 } 2175 EXPORT_SYMBOL(p9_client_mknod_dotl); 2176 2177 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2178 kgid_t gid, struct p9_qid *qid) 2179 { 2180 int err; 2181 struct p9_client *clnt; 2182 struct p9_req_t *req; 2183 2184 err = 0; 2185 clnt = fid->clnt; 2186 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2187 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2188 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode, 2189 gid); 2190 if (IS_ERR(req)) 2191 return PTR_ERR(req); 2192 2193 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2194 if (err) { 2195 trace_9p_protocol_dump(clnt, &req->rc); 2196 goto error; 2197 } 2198 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2199 (unsigned long long)qid->path, qid->version); 2200 2201 error: 2202 p9_tag_remove(clnt, req); 2203 return err; 2204 2205 } 2206 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2207 2208 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2209 { 2210 int err; 2211 struct p9_client *clnt; 2212 struct p9_req_t *req; 2213 2214 err = 0; 2215 clnt = fid->clnt; 2216 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " 2217 "start %lld length %lld proc_id %d client_id %s\n", 2218 fid->fid, flock->type, flock->flags, flock->start, 2219 flock->length, flock->proc_id, flock->client_id); 2220 2221 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2222 flock->flags, flock->start, flock->length, 2223 flock->proc_id, flock->client_id); 2224 2225 if (IS_ERR(req)) 2226 return PTR_ERR(req); 2227 2228 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); 2229 if (err) { 2230 trace_9p_protocol_dump(clnt, &req->rc); 2231 goto error; 2232 } 2233 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2234 error: 2235 p9_tag_remove(clnt, req); 2236 return err; 2237 2238 } 2239 EXPORT_SYMBOL(p9_client_lock_dotl); 2240 2241 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2242 { 2243 int err; 2244 struct p9_client *clnt; 2245 struct p9_req_t *req; 2246 2247 err = 0; 2248 clnt = fid->clnt; 2249 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " 2250 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, 2251 glock->start, glock->length, glock->proc_id, glock->client_id); 2252 2253 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, 2254 glock->start, glock->length, glock->proc_id, glock->client_id); 2255 2256 if (IS_ERR(req)) 2257 return PTR_ERR(req); 2258 2259 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, 2260 &glock->start, &glock->length, &glock->proc_id, 2261 &glock->client_id); 2262 if (err) { 2263 trace_9p_protocol_dump(clnt, &req->rc); 2264 goto error; 2265 } 2266 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " 2267 "proc_id %d client_id %s\n", glock->type, glock->start, 2268 glock->length, glock->proc_id, glock->client_id); 2269 error: 2270 p9_tag_remove(clnt, req); 2271 return err; 2272 } 2273 EXPORT_SYMBOL(p9_client_getlock_dotl); 2274 2275 int p9_client_readlink(struct p9_fid *fid, char **target) 2276 { 2277 int err; 2278 struct p9_client *clnt; 2279 struct p9_req_t *req; 2280 2281 err = 0; 2282 clnt = fid->clnt; 2283 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2284 2285 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2286 if (IS_ERR(req)) 2287 return PTR_ERR(req); 2288 2289 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); 2290 if (err) { 2291 trace_9p_protocol_dump(clnt, &req->rc); 2292 goto error; 2293 } 2294 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2295 error: 2296 p9_tag_remove(clnt, req); 2297 return err; 2298 } 2299 EXPORT_SYMBOL(p9_client_readlink); 2300 2301 int __init p9_client_init(void) 2302 { 2303 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); 2304 return p9_req_cache ? 0 : -ENOMEM; 2305 } 2306 2307 void __exit p9_client_exit(void) 2308 { 2309 kmem_cache_destroy(p9_req_cache); 2310 } 2311