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 * @status: request status, one of REQ_STATUS_* 418 * 419 */ 420 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) 421 { 422 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); 423 424 /* 425 * This barrier is needed to make sure any change made to req before 426 * the status change is visible to another thread 427 */ 428 smp_wmb(); 429 req->status = status; 430 431 wake_up(&req->wq); 432 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); 433 p9_req_put(req); 434 } 435 EXPORT_SYMBOL(p9_client_cb); 436 437 /** 438 * p9_parse_header - parse header arguments out of a packet 439 * @pdu: packet to parse 440 * @size: size of packet 441 * @type: type of request 442 * @tag: tag of packet 443 * @rewind: set if we need to rewind offset afterwards 444 */ 445 446 int 447 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, 448 int rewind) 449 { 450 int8_t r_type; 451 int16_t r_tag; 452 int32_t r_size; 453 int offset = pdu->offset; 454 int err; 455 456 pdu->offset = 0; 457 458 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 459 if (err) 460 goto rewind_and_exit; 461 462 if (type) 463 *type = r_type; 464 if (tag) 465 *tag = r_tag; 466 if (size) 467 *size = r_size; 468 469 if (pdu->size != r_size || r_size < 7) { 470 err = -EINVAL; 471 goto rewind_and_exit; 472 } 473 474 pdu->id = r_type; 475 pdu->tag = r_tag; 476 477 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 478 pdu->size, pdu->id, pdu->tag); 479 480 rewind_and_exit: 481 if (rewind) 482 pdu->offset = offset; 483 return err; 484 } 485 EXPORT_SYMBOL(p9_parse_header); 486 487 /** 488 * p9_check_errors - check 9p packet for error return and process it 489 * @c: current client instance 490 * @req: request to parse and check for error conditions 491 * 492 * returns error code if one is discovered, otherwise returns 0 493 * 494 * this will have to be more complicated if we have multiple 495 * error packet types 496 */ 497 498 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 499 { 500 int8_t type; 501 int err; 502 int ecode; 503 504 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 505 if (req->rc.size >= c->msize) { 506 p9_debug(P9_DEBUG_ERROR, 507 "requested packet size too big: %d\n", 508 req->rc.size); 509 return -EIO; 510 } 511 /* 512 * dump the response from server 513 * This should be after check errors which poplulate pdu_fcall. 514 */ 515 trace_9p_protocol_dump(c, &req->rc); 516 if (err) { 517 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 518 return err; 519 } 520 if (type != P9_RERROR && type != P9_RLERROR) 521 return 0; 522 523 if (!p9_is_proto_dotl(c)) { 524 char *ename; 525 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 526 &ename, &ecode); 527 if (err) 528 goto out_err; 529 530 if (p9_is_proto_dotu(c) && ecode < 512) 531 err = -ecode; 532 533 if (!err) { 534 err = p9_errstr2errno(ename, strlen(ename)); 535 536 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 537 -ecode, ename); 538 } 539 kfree(ename); 540 } else { 541 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 542 err = -ecode; 543 544 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 545 } 546 547 return err; 548 549 out_err: 550 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 551 552 return err; 553 } 554 555 /** 556 * p9_check_zc_errors - check 9p packet for error return and process it 557 * @c: current client instance 558 * @req: request to parse and check for error conditions 559 * @uidata: external buffer containing error 560 * @in_hdrlen: Size of response protocol buffer. 561 * 562 * returns error code if one is discovered, otherwise returns 0 563 * 564 * this will have to be more complicated if we have multiple 565 * error packet types 566 */ 567 568 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req, 569 struct iov_iter *uidata, int in_hdrlen) 570 { 571 int err; 572 int ecode; 573 int8_t type; 574 char *ename = NULL; 575 576 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 577 /* 578 * dump the response from server 579 * This should be after parse_header which poplulate pdu_fcall. 580 */ 581 trace_9p_protocol_dump(c, &req->rc); 582 if (err) { 583 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 584 return err; 585 } 586 587 if (type != P9_RERROR && type != P9_RLERROR) 588 return 0; 589 590 if (!p9_is_proto_dotl(c)) { 591 /* Error is reported in string format */ 592 int len; 593 /* 7 = header size for RERROR; */ 594 int inline_len = in_hdrlen - 7; 595 596 len = req->rc.size - req->rc.offset; 597 if (len > (P9_ZC_HDR_SZ - 7)) { 598 err = -EFAULT; 599 goto out_err; 600 } 601 602 ename = &req->rc.sdata[req->rc.offset]; 603 if (len > inline_len) { 604 /* We have error in external buffer */ 605 if (!copy_from_iter_full(ename + inline_len, 606 len - inline_len, uidata)) { 607 err = -EFAULT; 608 goto out_err; 609 } 610 } 611 ename = NULL; 612 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 613 &ename, &ecode); 614 if (err) 615 goto out_err; 616 617 if (p9_is_proto_dotu(c) && ecode < 512) 618 err = -ecode; 619 620 if (!err) { 621 err = p9_errstr2errno(ename, strlen(ename)); 622 623 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 624 -ecode, ename); 625 } 626 kfree(ename); 627 } else { 628 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 629 err = -ecode; 630 631 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 632 } 633 return err; 634 635 out_err: 636 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 637 return err; 638 } 639 640 static struct p9_req_t * 641 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 642 643 /** 644 * p9_client_flush - flush (cancel) a request 645 * @c: client state 646 * @oldreq: request to cancel 647 * 648 * This sents a flush for a particular request and links 649 * the flush request to the original request. The current 650 * code only supports a single flush request although the protocol 651 * allows for multiple flush requests to be sent for a single request. 652 * 653 */ 654 655 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 656 { 657 struct p9_req_t *req; 658 int16_t oldtag; 659 int err; 660 661 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); 662 if (err) 663 return err; 664 665 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 666 667 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 668 if (IS_ERR(req)) 669 return PTR_ERR(req); 670 671 /* 672 * if we haven't received a response for oldreq, 673 * remove it from the list 674 */ 675 if (oldreq->status == REQ_STATUS_SENT) { 676 if (c->trans_mod->cancelled) 677 c->trans_mod->cancelled(c, oldreq); 678 } 679 680 p9_tag_remove(c, req); 681 return 0; 682 } 683 684 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 685 int8_t type, int req_size, 686 const char *fmt, va_list ap) 687 { 688 int err; 689 struct p9_req_t *req; 690 691 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 692 693 /* we allow for any status other than disconnected */ 694 if (c->status == Disconnected) 695 return ERR_PTR(-EIO); 696 697 /* if status is begin_disconnected we allow only clunk request */ 698 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) 699 return ERR_PTR(-EIO); 700 701 req = p9_tag_alloc(c, type, req_size); 702 if (IS_ERR(req)) 703 return req; 704 705 /* marshall the data */ 706 p9pdu_prepare(&req->tc, req->tc.tag, type); 707 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); 708 if (err) 709 goto reterr; 710 p9pdu_finalize(c, &req->tc); 711 trace_9p_client_req(c, type, req->tc.tag); 712 return req; 713 reterr: 714 p9_tag_remove(c, req); 715 /* We have to put also the 2nd reference as it won't be used */ 716 p9_req_put(req); 717 return ERR_PTR(err); 718 } 719 720 /** 721 * p9_client_rpc - issue a request and wait for a response 722 * @c: client session 723 * @type: type of request 724 * @fmt: protocol format string (see protocol.c) 725 * 726 * Returns request structure (which client must free using p9_tag_remove) 727 */ 728 729 static struct p9_req_t * 730 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 731 { 732 va_list ap; 733 int sigpending, err; 734 unsigned long flags; 735 struct p9_req_t *req; 736 737 va_start(ap, fmt); 738 req = p9_client_prepare_req(c, type, c->msize, fmt, ap); 739 va_end(ap); 740 if (IS_ERR(req)) 741 return req; 742 743 if (signal_pending(current)) { 744 sigpending = 1; 745 clear_thread_flag(TIF_SIGPENDING); 746 } else 747 sigpending = 0; 748 749 err = c->trans_mod->request(c, req); 750 if (err < 0) { 751 /* write won't happen */ 752 p9_req_put(req); 753 if (err != -ERESTARTSYS && err != -EFAULT) 754 c->status = Disconnected; 755 goto recalc_sigpending; 756 } 757 again: 758 /* Wait for the response */ 759 err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD); 760 761 /* 762 * Make sure our req is coherent with regard to updates in other 763 * threads - echoes to wmb() in the callback 764 */ 765 smp_rmb(); 766 767 if ((err == -ERESTARTSYS) && (c->status == Connected) 768 && (type == P9_TFLUSH)) { 769 sigpending = 1; 770 clear_thread_flag(TIF_SIGPENDING); 771 goto again; 772 } 773 774 if (req->status == REQ_STATUS_ERROR) { 775 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 776 err = req->t_err; 777 } 778 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 779 p9_debug(P9_DEBUG_MUX, "flushing\n"); 780 sigpending = 1; 781 clear_thread_flag(TIF_SIGPENDING); 782 783 if (c->trans_mod->cancel(c, req)) 784 p9_client_flush(c, req); 785 786 /* if we received the response anyway, don't signal error */ 787 if (req->status == REQ_STATUS_RCVD) 788 err = 0; 789 } 790 recalc_sigpending: 791 if (sigpending) { 792 spin_lock_irqsave(¤t->sighand->siglock, flags); 793 recalc_sigpending(); 794 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 795 } 796 if (err < 0) 797 goto reterr; 798 799 err = p9_check_errors(c, req); 800 trace_9p_client_res(c, type, req->rc.tag, err); 801 if (!err) 802 return req; 803 reterr: 804 p9_tag_remove(c, req); 805 return ERR_PTR(safe_errno(err)); 806 } 807 808 /** 809 * p9_client_zc_rpc - issue a request and wait for a response 810 * @c: client session 811 * @type: type of request 812 * @uidata: destination for zero copy read 813 * @uodata: source for zero copy write 814 * @inlen: read buffer size 815 * @olen: write buffer size 816 * @in_hdrlen: reader header size, This is the size of response protocol data 817 * @fmt: protocol format string (see protocol.c) 818 * 819 * Returns request structure (which client must free using p9_tag_remove) 820 */ 821 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 822 struct iov_iter *uidata, 823 struct iov_iter *uodata, 824 int inlen, int olen, int in_hdrlen, 825 const char *fmt, ...) 826 { 827 va_list ap; 828 int sigpending, err; 829 unsigned long flags; 830 struct p9_req_t *req; 831 832 va_start(ap, fmt); 833 /* 834 * We allocate a inline protocol data of only 4k bytes. 835 * The actual content is passed in zero-copy fashion. 836 */ 837 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); 838 va_end(ap); 839 if (IS_ERR(req)) 840 return req; 841 842 if (signal_pending(current)) { 843 sigpending = 1; 844 clear_thread_flag(TIF_SIGPENDING); 845 } else 846 sigpending = 0; 847 848 err = c->trans_mod->zc_request(c, req, uidata, uodata, 849 inlen, olen, in_hdrlen); 850 if (err < 0) { 851 if (err == -EIO) 852 c->status = Disconnected; 853 if (err != -ERESTARTSYS) 854 goto recalc_sigpending; 855 } 856 if (req->status == REQ_STATUS_ERROR) { 857 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 858 err = req->t_err; 859 } 860 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 861 p9_debug(P9_DEBUG_MUX, "flushing\n"); 862 sigpending = 1; 863 clear_thread_flag(TIF_SIGPENDING); 864 865 if (c->trans_mod->cancel(c, req)) 866 p9_client_flush(c, req); 867 868 /* if we received the response anyway, don't signal error */ 869 if (req->status == REQ_STATUS_RCVD) 870 err = 0; 871 } 872 recalc_sigpending: 873 if (sigpending) { 874 spin_lock_irqsave(¤t->sighand->siglock, flags); 875 recalc_sigpending(); 876 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 877 } 878 if (err < 0) 879 goto reterr; 880 881 err = p9_check_zc_errors(c, req, uidata, in_hdrlen); 882 trace_9p_client_res(c, type, req->rc.tag, err); 883 if (!err) 884 return req; 885 reterr: 886 p9_tag_remove(c, req); 887 return ERR_PTR(safe_errno(err)); 888 } 889 890 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 891 { 892 int ret; 893 struct p9_fid *fid; 894 895 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 896 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 897 if (!fid) 898 return NULL; 899 900 memset(&fid->qid, 0, sizeof(struct p9_qid)); 901 fid->mode = -1; 902 fid->uid = current_fsuid(); 903 fid->clnt = clnt; 904 fid->rdir = NULL; 905 fid->fid = 0; 906 refcount_set(&fid->count, 1); 907 908 idr_preload(GFP_KERNEL); 909 spin_lock_irq(&clnt->lock); 910 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, 911 GFP_NOWAIT); 912 spin_unlock_irq(&clnt->lock); 913 idr_preload_end(); 914 if (!ret) 915 return fid; 916 917 kfree(fid); 918 return NULL; 919 } 920 921 static void p9_fid_destroy(struct p9_fid *fid) 922 { 923 struct p9_client *clnt; 924 unsigned long flags; 925 926 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 927 clnt = fid->clnt; 928 spin_lock_irqsave(&clnt->lock, flags); 929 idr_remove(&clnt->fids, fid->fid); 930 spin_unlock_irqrestore(&clnt->lock, flags); 931 kfree(fid->rdir); 932 kfree(fid); 933 } 934 935 static int p9_client_version(struct p9_client *c) 936 { 937 int err = 0; 938 struct p9_req_t *req; 939 char *version = NULL; 940 int msize; 941 942 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 943 c->msize, c->proto_version); 944 945 switch (c->proto_version) { 946 case p9_proto_2000L: 947 req = p9_client_rpc(c, P9_TVERSION, "ds", 948 c->msize, "9P2000.L"); 949 break; 950 case p9_proto_2000u: 951 req = p9_client_rpc(c, P9_TVERSION, "ds", 952 c->msize, "9P2000.u"); 953 break; 954 case p9_proto_legacy: 955 req = p9_client_rpc(c, P9_TVERSION, "ds", 956 c->msize, "9P2000"); 957 break; 958 default: 959 return -EINVAL; 960 } 961 962 if (IS_ERR(req)) 963 return PTR_ERR(req); 964 965 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); 966 if (err) { 967 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 968 trace_9p_protocol_dump(c, &req->rc); 969 goto error; 970 } 971 972 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 973 if (!strncmp(version, "9P2000.L", 8)) 974 c->proto_version = p9_proto_2000L; 975 else if (!strncmp(version, "9P2000.u", 8)) 976 c->proto_version = p9_proto_2000u; 977 else if (!strncmp(version, "9P2000", 6)) 978 c->proto_version = p9_proto_legacy; 979 else { 980 p9_debug(P9_DEBUG_ERROR, 981 "server returned an unknown version: %s\n", version); 982 err = -EREMOTEIO; 983 goto error; 984 } 985 986 if (msize < 4096) { 987 p9_debug(P9_DEBUG_ERROR, 988 "server returned a msize < 4096: %d\n", msize); 989 err = -EREMOTEIO; 990 goto error; 991 } 992 if (msize < c->msize) 993 c->msize = msize; 994 995 error: 996 kfree(version); 997 p9_tag_remove(c, req); 998 999 return err; 1000 } 1001 1002 struct p9_client *p9_client_create(const char *dev_name, char *options) 1003 { 1004 int err; 1005 struct p9_client *clnt; 1006 char *client_id; 1007 1008 err = 0; 1009 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 1010 if (!clnt) 1011 return ERR_PTR(-ENOMEM); 1012 1013 clnt->trans_mod = NULL; 1014 clnt->trans = NULL; 1015 clnt->fcall_cache = NULL; 1016 1017 client_id = utsname()->nodename; 1018 memcpy(clnt->name, client_id, strlen(client_id) + 1); 1019 1020 spin_lock_init(&clnt->lock); 1021 idr_init(&clnt->fids); 1022 idr_init(&clnt->reqs); 1023 1024 err = parse_opts(options, clnt); 1025 if (err < 0) 1026 goto free_client; 1027 1028 if (!clnt->trans_mod) 1029 clnt->trans_mod = v9fs_get_default_trans(); 1030 1031 if (clnt->trans_mod == NULL) { 1032 err = -EPROTONOSUPPORT; 1033 p9_debug(P9_DEBUG_ERROR, 1034 "No transport defined or default transport\n"); 1035 goto free_client; 1036 } 1037 1038 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1039 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1040 1041 err = clnt->trans_mod->create(clnt, dev_name, options); 1042 if (err) 1043 goto put_trans; 1044 1045 if (clnt->msize > clnt->trans_mod->maxsize) 1046 clnt->msize = clnt->trans_mod->maxsize; 1047 1048 if (clnt->msize < 4096) { 1049 p9_debug(P9_DEBUG_ERROR, 1050 "Please specify a msize of at least 4k\n"); 1051 err = -EINVAL; 1052 goto close_trans; 1053 } 1054 1055 err = p9_client_version(clnt); 1056 if (err) 1057 goto close_trans; 1058 1059 /* P9_HDRSZ + 4 is the smallest packet header we can have that is 1060 * followed by data accessed from userspace by read 1061 */ 1062 clnt->fcall_cache = 1063 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, 1064 0, 0, P9_HDRSZ + 4, 1065 clnt->msize - (P9_HDRSZ + 4), 1066 NULL); 1067 1068 return clnt; 1069 1070 close_trans: 1071 clnt->trans_mod->close(clnt); 1072 put_trans: 1073 v9fs_put_trans(clnt->trans_mod); 1074 free_client: 1075 kfree(clnt); 1076 return ERR_PTR(err); 1077 } 1078 EXPORT_SYMBOL(p9_client_create); 1079 1080 void p9_client_destroy(struct p9_client *clnt) 1081 { 1082 struct p9_fid *fid; 1083 int id; 1084 1085 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1086 1087 if (clnt->trans_mod) 1088 clnt->trans_mod->close(clnt); 1089 1090 v9fs_put_trans(clnt->trans_mod); 1091 1092 idr_for_each_entry(&clnt->fids, fid, id) { 1093 pr_info("Found fid %d not clunked\n", fid->fid); 1094 p9_fid_destroy(fid); 1095 } 1096 1097 p9_tag_cleanup(clnt); 1098 1099 kmem_cache_destroy(clnt->fcall_cache); 1100 kfree(clnt); 1101 } 1102 EXPORT_SYMBOL(p9_client_destroy); 1103 1104 void p9_client_disconnect(struct p9_client *clnt) 1105 { 1106 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1107 clnt->status = Disconnected; 1108 } 1109 EXPORT_SYMBOL(p9_client_disconnect); 1110 1111 void p9_client_begin_disconnect(struct p9_client *clnt) 1112 { 1113 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1114 clnt->status = BeginDisconnect; 1115 } 1116 EXPORT_SYMBOL(p9_client_begin_disconnect); 1117 1118 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1119 const char *uname, kuid_t n_uname, const char *aname) 1120 { 1121 int err = 0; 1122 struct p9_req_t *req; 1123 struct p9_fid *fid; 1124 struct p9_qid qid; 1125 1126 1127 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1128 afid ? afid->fid : -1, uname, aname); 1129 fid = p9_fid_create(clnt); 1130 if (!fid) { 1131 err = -ENOMEM; 1132 goto error; 1133 } 1134 fid->uid = n_uname; 1135 1136 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1137 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1138 if (IS_ERR(req)) { 1139 err = PTR_ERR(req); 1140 goto error; 1141 } 1142 1143 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); 1144 if (err) { 1145 trace_9p_protocol_dump(clnt, &req->rc); 1146 p9_tag_remove(clnt, req); 1147 goto error; 1148 } 1149 1150 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1151 qid.type, (unsigned long long)qid.path, qid.version); 1152 1153 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1154 1155 p9_tag_remove(clnt, req); 1156 return fid; 1157 1158 error: 1159 if (fid) 1160 p9_fid_destroy(fid); 1161 return ERR_PTR(err); 1162 } 1163 EXPORT_SYMBOL(p9_client_attach); 1164 1165 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1166 const unsigned char * const *wnames, int clone) 1167 { 1168 int err; 1169 struct p9_client *clnt; 1170 struct p9_fid *fid; 1171 struct p9_qid *wqids; 1172 struct p9_req_t *req; 1173 uint16_t nwqids, count; 1174 1175 err = 0; 1176 wqids = NULL; 1177 clnt = oldfid->clnt; 1178 if (clone) { 1179 fid = p9_fid_create(clnt); 1180 if (!fid) { 1181 err = -ENOMEM; 1182 goto error; 1183 } 1184 1185 fid->uid = oldfid->uid; 1186 } else 1187 fid = oldfid; 1188 1189 1190 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1191 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1192 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1193 nwname, wnames); 1194 if (IS_ERR(req)) { 1195 err = PTR_ERR(req); 1196 goto error; 1197 } 1198 1199 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1200 if (err) { 1201 trace_9p_protocol_dump(clnt, &req->rc); 1202 p9_tag_remove(clnt, req); 1203 goto clunk_fid; 1204 } 1205 p9_tag_remove(clnt, req); 1206 1207 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1208 1209 if (nwqids != nwname) { 1210 err = -ENOENT; 1211 goto clunk_fid; 1212 } 1213 1214 for (count = 0; count < nwqids; count++) 1215 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1216 count, wqids[count].type, 1217 (unsigned long long)wqids[count].path, 1218 wqids[count].version); 1219 1220 if (nwname) 1221 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1222 else 1223 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); 1224 1225 kfree(wqids); 1226 return fid; 1227 1228 clunk_fid: 1229 kfree(wqids); 1230 p9_client_clunk(fid); 1231 fid = NULL; 1232 1233 error: 1234 if (fid && (fid != oldfid)) 1235 p9_fid_destroy(fid); 1236 1237 return ERR_PTR(err); 1238 } 1239 EXPORT_SYMBOL(p9_client_walk); 1240 1241 int p9_client_open(struct p9_fid *fid, int mode) 1242 { 1243 int err; 1244 struct p9_client *clnt; 1245 struct p9_req_t *req; 1246 struct p9_qid qid; 1247 int iounit; 1248 1249 clnt = fid->clnt; 1250 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1251 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1252 err = 0; 1253 1254 if (fid->mode != -1) 1255 return -EINVAL; 1256 1257 if (p9_is_proto_dotl(clnt)) 1258 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1259 else 1260 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1261 if (IS_ERR(req)) { 1262 err = PTR_ERR(req); 1263 goto error; 1264 } 1265 1266 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1267 if (err) { 1268 trace_9p_protocol_dump(clnt, &req->rc); 1269 goto free_and_error; 1270 } 1271 1272 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1273 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1274 (unsigned long long)qid.path, qid.version, iounit); 1275 1276 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1277 fid->mode = mode; 1278 fid->iounit = iounit; 1279 1280 free_and_error: 1281 p9_tag_remove(clnt, req); 1282 error: 1283 return err; 1284 } 1285 EXPORT_SYMBOL(p9_client_open); 1286 1287 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode, 1288 kgid_t gid, struct p9_qid *qid) 1289 { 1290 int err = 0; 1291 struct p9_client *clnt; 1292 struct p9_req_t *req; 1293 int iounit; 1294 1295 p9_debug(P9_DEBUG_9P, 1296 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1297 ofid->fid, name, flags, mode, 1298 from_kgid(&init_user_ns, gid)); 1299 clnt = ofid->clnt; 1300 1301 if (ofid->mode != -1) 1302 return -EINVAL; 1303 1304 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1305 mode, gid); 1306 if (IS_ERR(req)) { 1307 err = PTR_ERR(req); 1308 goto error; 1309 } 1310 1311 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); 1312 if (err) { 1313 trace_9p_protocol_dump(clnt, &req->rc); 1314 goto free_and_error; 1315 } 1316 1317 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1318 qid->type, 1319 (unsigned long long)qid->path, 1320 qid->version, iounit); 1321 1322 memmove(&ofid->qid, qid, sizeof(struct p9_qid)); 1323 ofid->mode = mode; 1324 ofid->iounit = iounit; 1325 1326 free_and_error: 1327 p9_tag_remove(clnt, req); 1328 error: 1329 return err; 1330 } 1331 EXPORT_SYMBOL(p9_client_create_dotl); 1332 1333 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1334 char *extension) 1335 { 1336 int err; 1337 struct p9_client *clnt; 1338 struct p9_req_t *req; 1339 struct p9_qid qid; 1340 int iounit; 1341 1342 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1343 fid->fid, name, perm, mode); 1344 err = 0; 1345 clnt = fid->clnt; 1346 1347 if (fid->mode != -1) 1348 return -EINVAL; 1349 1350 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1351 mode, extension); 1352 if (IS_ERR(req)) { 1353 err = PTR_ERR(req); 1354 goto error; 1355 } 1356 1357 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1358 if (err) { 1359 trace_9p_protocol_dump(clnt, &req->rc); 1360 goto free_and_error; 1361 } 1362 1363 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1364 qid.type, 1365 (unsigned long long)qid.path, 1366 qid.version, iounit); 1367 1368 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1369 fid->mode = mode; 1370 fid->iounit = iounit; 1371 1372 free_and_error: 1373 p9_tag_remove(clnt, req); 1374 error: 1375 return err; 1376 } 1377 EXPORT_SYMBOL(p9_client_fcreate); 1378 1379 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1380 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1381 { 1382 int err = 0; 1383 struct p9_client *clnt; 1384 struct p9_req_t *req; 1385 1386 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1387 dfid->fid, name, symtgt); 1388 clnt = dfid->clnt; 1389 1390 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1391 gid); 1392 if (IS_ERR(req)) { 1393 err = PTR_ERR(req); 1394 goto error; 1395 } 1396 1397 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 1398 if (err) { 1399 trace_9p_protocol_dump(clnt, &req->rc); 1400 goto free_and_error; 1401 } 1402 1403 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1404 qid->type, (unsigned long long)qid->path, qid->version); 1405 1406 free_and_error: 1407 p9_tag_remove(clnt, req); 1408 error: 1409 return err; 1410 } 1411 EXPORT_SYMBOL(p9_client_symlink); 1412 1413 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1414 { 1415 struct p9_client *clnt; 1416 struct p9_req_t *req; 1417 1418 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1419 dfid->fid, oldfid->fid, newname); 1420 clnt = dfid->clnt; 1421 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1422 newname); 1423 if (IS_ERR(req)) 1424 return PTR_ERR(req); 1425 1426 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1427 p9_tag_remove(clnt, req); 1428 return 0; 1429 } 1430 EXPORT_SYMBOL(p9_client_link); 1431 1432 int p9_client_fsync(struct p9_fid *fid, int datasync) 1433 { 1434 int err; 1435 struct p9_client *clnt; 1436 struct p9_req_t *req; 1437 1438 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1439 fid->fid, datasync); 1440 err = 0; 1441 clnt = fid->clnt; 1442 1443 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1444 if (IS_ERR(req)) { 1445 err = PTR_ERR(req); 1446 goto error; 1447 } 1448 1449 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1450 1451 p9_tag_remove(clnt, req); 1452 1453 error: 1454 return err; 1455 } 1456 EXPORT_SYMBOL(p9_client_fsync); 1457 1458 int p9_client_clunk(struct p9_fid *fid) 1459 { 1460 int err; 1461 struct p9_client *clnt; 1462 struct p9_req_t *req; 1463 int retries = 0; 1464 1465 if (!fid || IS_ERR(fid)) { 1466 pr_warn("%s (%d): Trying to clunk with invalid fid\n", 1467 __func__, task_pid_nr(current)); 1468 dump_stack(); 1469 return 0; 1470 } 1471 if (!refcount_dec_and_test(&fid->count)) 1472 return 0; 1473 1474 again: 1475 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid, 1476 retries); 1477 err = 0; 1478 clnt = fid->clnt; 1479 1480 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1481 if (IS_ERR(req)) { 1482 err = PTR_ERR(req); 1483 goto error; 1484 } 1485 1486 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1487 1488 p9_tag_remove(clnt, req); 1489 error: 1490 /* 1491 * Fid is not valid even after a failed clunk 1492 * If interrupted, retry once then give up and 1493 * leak fid until umount. 1494 */ 1495 if (err == -ERESTARTSYS) { 1496 if (retries++ == 0) 1497 goto again; 1498 } else 1499 p9_fid_destroy(fid); 1500 return err; 1501 } 1502 EXPORT_SYMBOL(p9_client_clunk); 1503 1504 int p9_client_remove(struct p9_fid *fid) 1505 { 1506 int err; 1507 struct p9_client *clnt; 1508 struct p9_req_t *req; 1509 1510 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1511 err = 0; 1512 clnt = fid->clnt; 1513 1514 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1515 if (IS_ERR(req)) { 1516 err = PTR_ERR(req); 1517 goto error; 1518 } 1519 1520 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1521 1522 p9_tag_remove(clnt, req); 1523 error: 1524 if (err == -ERESTARTSYS) 1525 p9_client_clunk(fid); 1526 else 1527 p9_fid_destroy(fid); 1528 return err; 1529 } 1530 EXPORT_SYMBOL(p9_client_remove); 1531 1532 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1533 { 1534 int err = 0; 1535 struct p9_req_t *req; 1536 struct p9_client *clnt; 1537 1538 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1539 dfid->fid, name, flags); 1540 1541 clnt = dfid->clnt; 1542 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1543 if (IS_ERR(req)) { 1544 err = PTR_ERR(req); 1545 goto error; 1546 } 1547 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1548 1549 p9_tag_remove(clnt, req); 1550 error: 1551 return err; 1552 } 1553 EXPORT_SYMBOL(p9_client_unlinkat); 1554 1555 int 1556 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1557 { 1558 int total = 0; 1559 *err = 0; 1560 1561 while (iov_iter_count(to)) { 1562 int count; 1563 1564 count = p9_client_read_once(fid, offset, to, err); 1565 if (!count || *err) 1566 break; 1567 offset += count; 1568 total += count; 1569 } 1570 return total; 1571 } 1572 EXPORT_SYMBOL(p9_client_read); 1573 1574 int 1575 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, 1576 int *err) 1577 { 1578 struct p9_client *clnt = fid->clnt; 1579 struct p9_req_t *req; 1580 int count = iov_iter_count(to); 1581 int rsize, non_zc = 0; 1582 char *dataptr; 1583 1584 *err = 0; 1585 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", 1586 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to)); 1587 1588 rsize = fid->iounit; 1589 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1590 rsize = clnt->msize - P9_IOHDRSZ; 1591 1592 if (count < rsize) 1593 rsize = count; 1594 1595 /* Don't bother zerocopy for small IO (< 1024) */ 1596 if (clnt->trans_mod->zc_request && rsize > 1024) { 1597 /* response header len is 11 1598 * PDU Header(7) + IO Size (4) 1599 */ 1600 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1601 0, 11, "dqd", fid->fid, 1602 offset, rsize); 1603 } else { 1604 non_zc = 1; 1605 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1606 rsize); 1607 } 1608 if (IS_ERR(req)) { 1609 *err = PTR_ERR(req); 1610 return 0; 1611 } 1612 1613 *err = p9pdu_readf(&req->rc, clnt->proto_version, 1614 "D", &count, &dataptr); 1615 if (*err) { 1616 trace_9p_protocol_dump(clnt, &req->rc); 1617 p9_tag_remove(clnt, req); 1618 return 0; 1619 } 1620 if (rsize < count) { 1621 pr_err("bogus RREAD count (%d > %d)\n", count, rsize); 1622 count = rsize; 1623 } 1624 1625 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1626 1627 if (non_zc) { 1628 int n = copy_to_iter(dataptr, count, to); 1629 1630 if (n != count) { 1631 *err = -EFAULT; 1632 p9_tag_remove(clnt, req); 1633 return n; 1634 } 1635 } else { 1636 iov_iter_advance(to, count); 1637 } 1638 p9_tag_remove(clnt, req); 1639 return count; 1640 } 1641 EXPORT_SYMBOL(p9_client_read_once); 1642 1643 int 1644 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1645 { 1646 struct p9_client *clnt = fid->clnt; 1647 struct p9_req_t *req; 1648 int total = 0; 1649 *err = 0; 1650 1651 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", 1652 fid->fid, (unsigned long long) offset, 1653 iov_iter_count(from)); 1654 1655 while (iov_iter_count(from)) { 1656 int count = iov_iter_count(from); 1657 int rsize = fid->iounit; 1658 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1659 rsize = clnt->msize - P9_IOHDRSZ; 1660 1661 if (count < rsize) 1662 rsize = count; 1663 1664 /* Don't bother zerocopy for small IO (< 1024) */ 1665 if (clnt->trans_mod->zc_request && rsize > 1024) { 1666 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1667 rsize, P9_ZC_HDR_SZ, "dqd", 1668 fid->fid, offset, rsize); 1669 } else { 1670 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1671 offset, rsize, from); 1672 } 1673 if (IS_ERR(req)) { 1674 *err = PTR_ERR(req); 1675 break; 1676 } 1677 1678 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count); 1679 if (*err) { 1680 trace_9p_protocol_dump(clnt, &req->rc); 1681 p9_tag_remove(clnt, req); 1682 break; 1683 } 1684 if (rsize < count) { 1685 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize); 1686 count = rsize; 1687 } 1688 1689 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1690 1691 p9_tag_remove(clnt, req); 1692 iov_iter_advance(from, count); 1693 total += count; 1694 offset += count; 1695 } 1696 return total; 1697 } 1698 EXPORT_SYMBOL(p9_client_write); 1699 1700 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1701 { 1702 int err; 1703 struct p9_client *clnt; 1704 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1705 struct p9_req_t *req; 1706 u16 ignored; 1707 1708 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1709 1710 if (!ret) 1711 return ERR_PTR(-ENOMEM); 1712 1713 err = 0; 1714 clnt = fid->clnt; 1715 1716 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1717 if (IS_ERR(req)) { 1718 err = PTR_ERR(req); 1719 goto error; 1720 } 1721 1722 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); 1723 if (err) { 1724 trace_9p_protocol_dump(clnt, &req->rc); 1725 p9_tag_remove(clnt, req); 1726 goto error; 1727 } 1728 1729 p9_debug(P9_DEBUG_9P, 1730 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1731 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1732 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1733 "<<< uid=%d gid=%d n_muid=%d\n", 1734 ret->size, ret->type, ret->dev, ret->qid.type, 1735 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1736 ret->atime, ret->mtime, (unsigned long long)ret->length, 1737 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1738 from_kuid(&init_user_ns, ret->n_uid), 1739 from_kgid(&init_user_ns, ret->n_gid), 1740 from_kuid(&init_user_ns, ret->n_muid)); 1741 1742 p9_tag_remove(clnt, req); 1743 return ret; 1744 1745 error: 1746 kfree(ret); 1747 return ERR_PTR(err); 1748 } 1749 EXPORT_SYMBOL(p9_client_stat); 1750 1751 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1752 u64 request_mask) 1753 { 1754 int err; 1755 struct p9_client *clnt; 1756 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1757 GFP_KERNEL); 1758 struct p9_req_t *req; 1759 1760 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1761 fid->fid, request_mask); 1762 1763 if (!ret) 1764 return ERR_PTR(-ENOMEM); 1765 1766 err = 0; 1767 clnt = fid->clnt; 1768 1769 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1770 if (IS_ERR(req)) { 1771 err = PTR_ERR(req); 1772 goto error; 1773 } 1774 1775 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); 1776 if (err) { 1777 trace_9p_protocol_dump(clnt, &req->rc); 1778 p9_tag_remove(clnt, req); 1779 goto error; 1780 } 1781 1782 p9_debug(P9_DEBUG_9P, 1783 "<<< RGETATTR st_result_mask=%lld\n" 1784 "<<< qid=%x.%llx.%x\n" 1785 "<<< st_mode=%8.8x st_nlink=%llu\n" 1786 "<<< st_uid=%d st_gid=%d\n" 1787 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1788 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1789 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1790 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1791 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1792 "<<< st_gen=%lld st_data_version=%lld\n", 1793 ret->st_result_mask, ret->qid.type, ret->qid.path, 1794 ret->qid.version, ret->st_mode, ret->st_nlink, 1795 from_kuid(&init_user_ns, ret->st_uid), 1796 from_kgid(&init_user_ns, ret->st_gid), 1797 ret->st_rdev, ret->st_size, ret->st_blksize, 1798 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1799 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1800 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1801 ret->st_gen, ret->st_data_version); 1802 1803 p9_tag_remove(clnt, req); 1804 return ret; 1805 1806 error: 1807 kfree(ret); 1808 return ERR_PTR(err); 1809 } 1810 EXPORT_SYMBOL(p9_client_getattr_dotl); 1811 1812 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1813 { 1814 int ret; 1815 1816 /* NOTE: size shouldn't include its own length */ 1817 /* size[2] type[2] dev[4] qid[13] */ 1818 /* mode[4] atime[4] mtime[4] length[8]*/ 1819 /* name[s] uid[s] gid[s] muid[s] */ 1820 ret = 2+4+13+4+4+4+8+2+2+2+2; 1821 1822 if (wst->name) 1823 ret += strlen(wst->name); 1824 if (wst->uid) 1825 ret += strlen(wst->uid); 1826 if (wst->gid) 1827 ret += strlen(wst->gid); 1828 if (wst->muid) 1829 ret += strlen(wst->muid); 1830 1831 if ((proto_version == p9_proto_2000u) || 1832 (proto_version == p9_proto_2000L)) { 1833 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1834 if (wst->extension) 1835 ret += strlen(wst->extension); 1836 } 1837 1838 return ret; 1839 } 1840 1841 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1842 { 1843 int err; 1844 struct p9_req_t *req; 1845 struct p9_client *clnt; 1846 1847 err = 0; 1848 clnt = fid->clnt; 1849 wst->size = p9_client_statsize(wst, clnt->proto_version); 1850 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1851 p9_debug(P9_DEBUG_9P, 1852 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1853 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1854 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1855 " uid=%d gid=%d n_muid=%d\n", 1856 wst->size, wst->type, wst->dev, wst->qid.type, 1857 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1858 wst->atime, wst->mtime, (unsigned long long)wst->length, 1859 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1860 from_kuid(&init_user_ns, wst->n_uid), 1861 from_kgid(&init_user_ns, wst->n_gid), 1862 from_kuid(&init_user_ns, wst->n_muid)); 1863 1864 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1865 if (IS_ERR(req)) { 1866 err = PTR_ERR(req); 1867 goto error; 1868 } 1869 1870 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1871 1872 p9_tag_remove(clnt, req); 1873 error: 1874 return err; 1875 } 1876 EXPORT_SYMBOL(p9_client_wstat); 1877 1878 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1879 { 1880 int err; 1881 struct p9_req_t *req; 1882 struct p9_client *clnt; 1883 1884 err = 0; 1885 clnt = fid->clnt; 1886 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1887 p9_debug(P9_DEBUG_9P, 1888 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1889 " atime_sec=%lld atime_nsec=%lld\n" 1890 " mtime_sec=%lld mtime_nsec=%lld\n", 1891 p9attr->valid, p9attr->mode, 1892 from_kuid(&init_user_ns, p9attr->uid), 1893 from_kgid(&init_user_ns, p9attr->gid), 1894 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1895 p9attr->mtime_sec, p9attr->mtime_nsec); 1896 1897 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1898 1899 if (IS_ERR(req)) { 1900 err = PTR_ERR(req); 1901 goto error; 1902 } 1903 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1904 p9_tag_remove(clnt, req); 1905 error: 1906 return err; 1907 } 1908 EXPORT_SYMBOL(p9_client_setattr); 1909 1910 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1911 { 1912 int err; 1913 struct p9_req_t *req; 1914 struct p9_client *clnt; 1915 1916 err = 0; 1917 clnt = fid->clnt; 1918 1919 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1920 1921 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1922 if (IS_ERR(req)) { 1923 err = PTR_ERR(req); 1924 goto error; 1925 } 1926 1927 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1928 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1929 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1930 if (err) { 1931 trace_9p_protocol_dump(clnt, &req->rc); 1932 p9_tag_remove(clnt, req); 1933 goto error; 1934 } 1935 1936 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1937 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1938 "fsid %llu namelen %ld\n", 1939 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1940 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1941 sb->fsid, (long int)sb->namelen); 1942 1943 p9_tag_remove(clnt, req); 1944 error: 1945 return err; 1946 } 1947 EXPORT_SYMBOL(p9_client_statfs); 1948 1949 int p9_client_rename(struct p9_fid *fid, 1950 struct p9_fid *newdirfid, const char *name) 1951 { 1952 int err; 1953 struct p9_req_t *req; 1954 struct p9_client *clnt; 1955 1956 err = 0; 1957 clnt = fid->clnt; 1958 1959 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1960 fid->fid, newdirfid->fid, name); 1961 1962 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1963 newdirfid->fid, name); 1964 if (IS_ERR(req)) { 1965 err = PTR_ERR(req); 1966 goto error; 1967 } 1968 1969 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1970 1971 p9_tag_remove(clnt, req); 1972 error: 1973 return err; 1974 } 1975 EXPORT_SYMBOL(p9_client_rename); 1976 1977 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1978 struct p9_fid *newdirfid, const char *new_name) 1979 { 1980 int err; 1981 struct p9_req_t *req; 1982 struct p9_client *clnt; 1983 1984 err = 0; 1985 clnt = olddirfid->clnt; 1986 1987 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" 1988 " newdirfid %d new name %s\n", olddirfid->fid, old_name, 1989 newdirfid->fid, new_name); 1990 1991 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1992 old_name, newdirfid->fid, new_name); 1993 if (IS_ERR(req)) { 1994 err = PTR_ERR(req); 1995 goto error; 1996 } 1997 1998 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1999 newdirfid->fid, new_name); 2000 2001 p9_tag_remove(clnt, req); 2002 error: 2003 return err; 2004 } 2005 EXPORT_SYMBOL(p9_client_renameat); 2006 2007 /* 2008 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 2009 */ 2010 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 2011 const char *attr_name, u64 *attr_size) 2012 { 2013 int err; 2014 struct p9_req_t *req; 2015 struct p9_client *clnt; 2016 struct p9_fid *attr_fid; 2017 2018 err = 0; 2019 clnt = file_fid->clnt; 2020 attr_fid = p9_fid_create(clnt); 2021 if (!attr_fid) { 2022 err = -ENOMEM; 2023 goto error; 2024 } 2025 p9_debug(P9_DEBUG_9P, 2026 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 2027 file_fid->fid, attr_fid->fid, attr_name); 2028 2029 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 2030 file_fid->fid, attr_fid->fid, attr_name); 2031 if (IS_ERR(req)) { 2032 err = PTR_ERR(req); 2033 goto error; 2034 } 2035 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); 2036 if (err) { 2037 trace_9p_protocol_dump(clnt, &req->rc); 2038 p9_tag_remove(clnt, req); 2039 goto clunk_fid; 2040 } 2041 p9_tag_remove(clnt, req); 2042 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2043 attr_fid->fid, *attr_size); 2044 return attr_fid; 2045 clunk_fid: 2046 p9_client_clunk(attr_fid); 2047 attr_fid = NULL; 2048 error: 2049 if (attr_fid && (attr_fid != file_fid)) 2050 p9_fid_destroy(attr_fid); 2051 2052 return ERR_PTR(err); 2053 } 2054 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2055 2056 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2057 u64 attr_size, int flags) 2058 { 2059 int err; 2060 struct p9_req_t *req; 2061 struct p9_client *clnt; 2062 2063 p9_debug(P9_DEBUG_9P, 2064 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 2065 fid->fid, name, (long long)attr_size, flags); 2066 err = 0; 2067 clnt = fid->clnt; 2068 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2069 fid->fid, name, attr_size, flags); 2070 if (IS_ERR(req)) { 2071 err = PTR_ERR(req); 2072 goto error; 2073 } 2074 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2075 p9_tag_remove(clnt, req); 2076 error: 2077 return err; 2078 } 2079 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2080 2081 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2082 { 2083 int err, rsize, non_zc = 0; 2084 struct p9_client *clnt; 2085 struct p9_req_t *req; 2086 char *dataptr; 2087 struct kvec kv = {.iov_base = data, .iov_len = count}; 2088 struct iov_iter to; 2089 2090 iov_iter_kvec(&to, READ, &kv, 1, count); 2091 2092 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2093 fid->fid, (unsigned long long) offset, count); 2094 2095 err = 0; 2096 clnt = fid->clnt; 2097 2098 rsize = fid->iounit; 2099 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 2100 rsize = clnt->msize - P9_READDIRHDRSZ; 2101 2102 if (count < rsize) 2103 rsize = count; 2104 2105 /* Don't bother zerocopy for small IO (< 1024) */ 2106 if (clnt->trans_mod->zc_request && rsize > 1024) { 2107 /* 2108 * response header len is 11 2109 * PDU Header(7) + IO Size (4) 2110 */ 2111 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2112 11, "dqd", fid->fid, offset, rsize); 2113 } else { 2114 non_zc = 1; 2115 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2116 offset, rsize); 2117 } 2118 if (IS_ERR(req)) { 2119 err = PTR_ERR(req); 2120 goto error; 2121 } 2122 2123 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); 2124 if (err) { 2125 trace_9p_protocol_dump(clnt, &req->rc); 2126 goto free_and_error; 2127 } 2128 if (rsize < count) { 2129 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2130 count = rsize; 2131 } 2132 2133 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2134 2135 if (non_zc) 2136 memmove(data, dataptr, count); 2137 2138 p9_tag_remove(clnt, req); 2139 return count; 2140 2141 free_and_error: 2142 p9_tag_remove(clnt, req); 2143 error: 2144 return err; 2145 } 2146 EXPORT_SYMBOL(p9_client_readdir); 2147 2148 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2149 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2150 { 2151 int err; 2152 struct p9_client *clnt; 2153 struct p9_req_t *req; 2154 2155 err = 0; 2156 clnt = fid->clnt; 2157 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 2158 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2159 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2160 MAJOR(rdev), MINOR(rdev), gid); 2161 if (IS_ERR(req)) 2162 return PTR_ERR(req); 2163 2164 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2165 if (err) { 2166 trace_9p_protocol_dump(clnt, &req->rc); 2167 goto error; 2168 } 2169 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 2170 (unsigned long long)qid->path, qid->version); 2171 2172 error: 2173 p9_tag_remove(clnt, req); 2174 return err; 2175 2176 } 2177 EXPORT_SYMBOL(p9_client_mknod_dotl); 2178 2179 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2180 kgid_t gid, struct p9_qid *qid) 2181 { 2182 int err; 2183 struct p9_client *clnt; 2184 struct p9_req_t *req; 2185 2186 err = 0; 2187 clnt = fid->clnt; 2188 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2189 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2190 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode, 2191 gid); 2192 if (IS_ERR(req)) 2193 return PTR_ERR(req); 2194 2195 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2196 if (err) { 2197 trace_9p_protocol_dump(clnt, &req->rc); 2198 goto error; 2199 } 2200 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2201 (unsigned long long)qid->path, qid->version); 2202 2203 error: 2204 p9_tag_remove(clnt, req); 2205 return err; 2206 2207 } 2208 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2209 2210 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2211 { 2212 int err; 2213 struct p9_client *clnt; 2214 struct p9_req_t *req; 2215 2216 err = 0; 2217 clnt = fid->clnt; 2218 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " 2219 "start %lld length %lld proc_id %d client_id %s\n", 2220 fid->fid, flock->type, flock->flags, flock->start, 2221 flock->length, flock->proc_id, flock->client_id); 2222 2223 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2224 flock->flags, flock->start, flock->length, 2225 flock->proc_id, flock->client_id); 2226 2227 if (IS_ERR(req)) 2228 return PTR_ERR(req); 2229 2230 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); 2231 if (err) { 2232 trace_9p_protocol_dump(clnt, &req->rc); 2233 goto error; 2234 } 2235 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2236 error: 2237 p9_tag_remove(clnt, req); 2238 return err; 2239 2240 } 2241 EXPORT_SYMBOL(p9_client_lock_dotl); 2242 2243 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2244 { 2245 int err; 2246 struct p9_client *clnt; 2247 struct p9_req_t *req; 2248 2249 err = 0; 2250 clnt = fid->clnt; 2251 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " 2252 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, 2253 glock->start, glock->length, glock->proc_id, glock->client_id); 2254 2255 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, 2256 glock->start, glock->length, glock->proc_id, glock->client_id); 2257 2258 if (IS_ERR(req)) 2259 return PTR_ERR(req); 2260 2261 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, 2262 &glock->start, &glock->length, &glock->proc_id, 2263 &glock->client_id); 2264 if (err) { 2265 trace_9p_protocol_dump(clnt, &req->rc); 2266 goto error; 2267 } 2268 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " 2269 "proc_id %d client_id %s\n", glock->type, glock->start, 2270 glock->length, glock->proc_id, glock->client_id); 2271 error: 2272 p9_tag_remove(clnt, req); 2273 return err; 2274 } 2275 EXPORT_SYMBOL(p9_client_getlock_dotl); 2276 2277 int p9_client_readlink(struct p9_fid *fid, char **target) 2278 { 2279 int err; 2280 struct p9_client *clnt; 2281 struct p9_req_t *req; 2282 2283 err = 0; 2284 clnt = fid->clnt; 2285 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2286 2287 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2288 if (IS_ERR(req)) 2289 return PTR_ERR(req); 2290 2291 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); 2292 if (err) { 2293 trace_9p_protocol_dump(clnt, &req->rc); 2294 goto error; 2295 } 2296 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2297 error: 2298 p9_tag_remove(clnt, req); 2299 return err; 2300 } 2301 EXPORT_SYMBOL(p9_client_readlink); 2302 2303 int __init p9_client_init(void) 2304 { 2305 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); 2306 return p9_req_cache ? 0 : -ENOMEM; 2307 } 2308 2309 void __exit p9_client_exit(void) 2310 { 2311 kmem_cache_destroy(p9_req_cache); 2312 } 2313