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 #define DEFAULT_MSIZE (128 * 1024) 34 35 /* 36 * Client Option Parsing (code inspired by NFS code) 37 * - a little lazy - parse all client options 38 */ 39 40 enum { 41 Opt_msize, 42 Opt_trans, 43 Opt_legacy, 44 Opt_version, 45 Opt_err, 46 }; 47 48 static const match_table_t tokens = { 49 {Opt_msize, "msize=%u"}, 50 {Opt_legacy, "noextend"}, 51 {Opt_trans, "trans=%s"}, 52 {Opt_version, "version=%s"}, 53 {Opt_err, NULL}, 54 }; 55 56 inline int p9_is_proto_dotl(struct p9_client *clnt) 57 { 58 return clnt->proto_version == p9_proto_2000L; 59 } 60 EXPORT_SYMBOL(p9_is_proto_dotl); 61 62 inline int p9_is_proto_dotu(struct p9_client *clnt) 63 { 64 return clnt->proto_version == p9_proto_2000u; 65 } 66 EXPORT_SYMBOL(p9_is_proto_dotu); 67 68 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt) 69 { 70 if (clnt->msize != DEFAULT_MSIZE) 71 seq_printf(m, ",msize=%u", clnt->msize); 72 seq_printf(m, ",trans=%s", clnt->trans_mod->name); 73 74 switch (clnt->proto_version) { 75 case p9_proto_legacy: 76 seq_puts(m, ",noextend"); 77 break; 78 case p9_proto_2000u: 79 seq_puts(m, ",version=9p2000.u"); 80 break; 81 case p9_proto_2000L: 82 /* Default */ 83 break; 84 } 85 86 if (clnt->trans_mod->show_options) 87 return clnt->trans_mod->show_options(m, clnt); 88 return 0; 89 } 90 EXPORT_SYMBOL(p9_show_client_options); 91 92 /* 93 * Some error codes are taken directly from the server replies, 94 * make sure they are valid. 95 */ 96 static int safe_errno(int err) 97 { 98 if ((err > 0) || (err < -MAX_ERRNO)) { 99 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err); 100 return -EPROTO; 101 } 102 return err; 103 } 104 105 106 /* Interpret mount option for protocol version */ 107 static int get_protocol_version(char *s) 108 { 109 int version = -EINVAL; 110 111 if (!strcmp(s, "9p2000")) { 112 version = p9_proto_legacy; 113 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n"); 114 } else if (!strcmp(s, "9p2000.u")) { 115 version = p9_proto_2000u; 116 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); 117 } else if (!strcmp(s, "9p2000.L")) { 118 version = p9_proto_2000L; 119 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); 120 } else 121 pr_info("Unknown protocol version %s\n", s); 122 123 return version; 124 } 125 126 /** 127 * parse_opts - parse mount options into client structure 128 * @opts: options string passed from mount 129 * @clnt: existing v9fs client information 130 * 131 * Return 0 upon success, -ERRNO upon failure 132 */ 133 134 static int parse_opts(char *opts, struct p9_client *clnt) 135 { 136 char *options, *tmp_options; 137 char *p; 138 substring_t args[MAX_OPT_ARGS]; 139 int option; 140 char *s; 141 int ret = 0; 142 143 clnt->proto_version = p9_proto_2000L; 144 clnt->msize = DEFAULT_MSIZE; 145 146 if (!opts) 147 return 0; 148 149 tmp_options = kstrdup(opts, GFP_KERNEL); 150 if (!tmp_options) { 151 p9_debug(P9_DEBUG_ERROR, 152 "failed to allocate copy of option string\n"); 153 return -ENOMEM; 154 } 155 options = tmp_options; 156 157 while ((p = strsep(&options, ",")) != NULL) { 158 int token, r; 159 if (!*p) 160 continue; 161 token = match_token(p, tokens, args); 162 switch (token) { 163 case Opt_msize: 164 r = match_int(&args[0], &option); 165 if (r < 0) { 166 p9_debug(P9_DEBUG_ERROR, 167 "integer field, but no integer?\n"); 168 ret = r; 169 continue; 170 } 171 if (option < 4096) { 172 p9_debug(P9_DEBUG_ERROR, 173 "msize should be at least 4k\n"); 174 ret = -EINVAL; 175 continue; 176 } 177 clnt->msize = option; 178 break; 179 case Opt_trans: 180 s = match_strdup(&args[0]); 181 if (!s) { 182 ret = -ENOMEM; 183 p9_debug(P9_DEBUG_ERROR, 184 "problem allocating copy of trans arg\n"); 185 goto free_and_return; 186 } 187 188 v9fs_put_trans(clnt->trans_mod); 189 clnt->trans_mod = v9fs_get_trans_by_name(s); 190 if (clnt->trans_mod == NULL) { 191 pr_info("Could not find request transport: %s\n", 192 s); 193 ret = -EINVAL; 194 } 195 kfree(s); 196 break; 197 case Opt_legacy: 198 clnt->proto_version = p9_proto_legacy; 199 break; 200 case Opt_version: 201 s = match_strdup(&args[0]); 202 if (!s) { 203 ret = -ENOMEM; 204 p9_debug(P9_DEBUG_ERROR, 205 "problem allocating copy of version arg\n"); 206 goto free_and_return; 207 } 208 r = get_protocol_version(s); 209 if (r < 0) 210 ret = r; 211 else 212 clnt->proto_version = r; 213 kfree(s); 214 break; 215 default: 216 continue; 217 } 218 } 219 220 free_and_return: 221 if (ret) 222 v9fs_put_trans(clnt->trans_mod); 223 kfree(tmp_options); 224 return ret; 225 } 226 227 static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc, 228 int alloc_msize) 229 { 230 if (likely(c->fcall_cache) && alloc_msize == c->msize) { 231 fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS); 232 fc->cache = c->fcall_cache; 233 } else { 234 fc->sdata = kmalloc(alloc_msize, GFP_NOFS); 235 fc->cache = NULL; 236 } 237 if (!fc->sdata) 238 return -ENOMEM; 239 fc->capacity = alloc_msize; 240 return 0; 241 } 242 243 void p9_fcall_fini(struct p9_fcall *fc) 244 { 245 /* sdata can be NULL for interrupted requests in trans_rdma, 246 * and kmem_cache_free does not do NULL-check for us 247 */ 248 if (unlikely(!fc->sdata)) 249 return; 250 251 if (fc->cache) 252 kmem_cache_free(fc->cache, fc->sdata); 253 else 254 kfree(fc->sdata); 255 } 256 EXPORT_SYMBOL(p9_fcall_fini); 257 258 static struct kmem_cache *p9_req_cache; 259 260 /** 261 * p9_tag_alloc - Allocate a new request. 262 * @c: Client session. 263 * @type: Transaction type. 264 * @max_size: Maximum packet size for this request. 265 * 266 * Context: Process context. 267 * Return: Pointer to new request. 268 */ 269 static struct p9_req_t * 270 p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size) 271 { 272 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); 273 int alloc_msize = min(c->msize, max_size); 274 int tag; 275 276 if (!req) 277 return ERR_PTR(-ENOMEM); 278 279 if (p9_fcall_init(c, &req->tc, alloc_msize)) 280 goto free_req; 281 if (p9_fcall_init(c, &req->rc, alloc_msize)) 282 goto free; 283 284 p9pdu_reset(&req->tc); 285 p9pdu_reset(&req->rc); 286 req->t_err = 0; 287 req->status = REQ_STATUS_ALLOC; 288 init_waitqueue_head(&req->wq); 289 INIT_LIST_HEAD(&req->req_list); 290 291 idr_preload(GFP_NOFS); 292 spin_lock_irq(&c->lock); 293 if (type == P9_TVERSION) 294 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1, 295 GFP_NOWAIT); 296 else 297 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT); 298 req->tc.tag = tag; 299 spin_unlock_irq(&c->lock); 300 idr_preload_end(); 301 if (tag < 0) 302 goto free; 303 304 /* Init ref to two because in the general case there is one ref 305 * that is put asynchronously by a writer thread, one ref 306 * temporarily given by p9_tag_lookup and put by p9_client_cb 307 * in the recv thread, and one ref put by p9_tag_remove in the 308 * main thread. The only exception is virtio that does not use 309 * p9_tag_lookup but does not have a writer thread either 310 * (the write happens synchronously in the request/zc_request 311 * callback), so p9_client_cb eats the second ref there 312 * as the pointer is duplicated directly by virtqueue_add_sgs() 313 */ 314 refcount_set(&req->refcount.refcount, 2); 315 316 return req; 317 318 free: 319 p9_fcall_fini(&req->tc); 320 p9_fcall_fini(&req->rc); 321 free_req: 322 kmem_cache_free(p9_req_cache, req); 323 return ERR_PTR(-ENOMEM); 324 } 325 326 /** 327 * p9_tag_lookup - Look up a request by tag. 328 * @c: Client session. 329 * @tag: Transaction ID. 330 * 331 * Context: Any context. 332 * Return: A request, or %NULL if there is no request with that tag. 333 */ 334 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 335 { 336 struct p9_req_t *req; 337 338 rcu_read_lock(); 339 again: 340 req = idr_find(&c->reqs, tag); 341 if (req) { 342 /* We have to be careful with the req found under rcu_read_lock 343 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the 344 * ref again without corrupting other data, then check again 345 * that the tag matches once we have the ref 346 */ 347 if (!p9_req_try_get(req)) 348 goto again; 349 if (req->tc.tag != tag) { 350 p9_req_put(req); 351 goto again; 352 } 353 } 354 rcu_read_unlock(); 355 356 return req; 357 } 358 EXPORT_SYMBOL(p9_tag_lookup); 359 360 /** 361 * p9_tag_remove - Remove a tag. 362 * @c: Client session. 363 * @r: Request of reference. 364 * 365 * Context: Any context. 366 */ 367 static int p9_tag_remove(struct p9_client *c, struct p9_req_t *r) 368 { 369 unsigned long flags; 370 u16 tag = r->tc.tag; 371 372 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); 373 spin_lock_irqsave(&c->lock, flags); 374 idr_remove(&c->reqs, tag); 375 spin_unlock_irqrestore(&c->lock, flags); 376 return p9_req_put(r); 377 } 378 379 static void p9_req_free(struct kref *ref) 380 { 381 struct p9_req_t *r = container_of(ref, struct p9_req_t, refcount); 382 p9_fcall_fini(&r->tc); 383 p9_fcall_fini(&r->rc); 384 kmem_cache_free(p9_req_cache, r); 385 } 386 387 int p9_req_put(struct p9_req_t *r) 388 { 389 return kref_put(&r->refcount, p9_req_free); 390 } 391 EXPORT_SYMBOL(p9_req_put); 392 393 /** 394 * p9_tag_cleanup - cleans up tags structure and reclaims resources 395 * @c: v9fs client struct 396 * 397 * This frees resources associated with the tags structure 398 * 399 */ 400 static void p9_tag_cleanup(struct p9_client *c) 401 { 402 struct p9_req_t *req; 403 int id; 404 405 rcu_read_lock(); 406 idr_for_each_entry(&c->reqs, req, id) { 407 pr_info("Tag %d still in use\n", id); 408 if (p9_tag_remove(c, req) == 0) 409 pr_warn("Packet with tag %d has still references", 410 req->tc.tag); 411 } 412 rcu_read_unlock(); 413 } 414 415 /** 416 * p9_client_cb - call back from transport to client 417 * @c: client state 418 * @req: request received 419 * @status: request status, one of REQ_STATUS_* 420 * 421 */ 422 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) 423 { 424 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); 425 426 /* 427 * This barrier is needed to make sure any change made to req before 428 * the status change is visible to another thread 429 */ 430 smp_wmb(); 431 req->status = status; 432 433 wake_up(&req->wq); 434 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); 435 p9_req_put(req); 436 } 437 EXPORT_SYMBOL(p9_client_cb); 438 439 /** 440 * p9_parse_header - parse header arguments out of a packet 441 * @pdu: packet to parse 442 * @size: size of packet 443 * @type: type of request 444 * @tag: tag of packet 445 * @rewind: set if we need to rewind offset afterwards 446 */ 447 448 int 449 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, 450 int rewind) 451 { 452 int8_t r_type; 453 int16_t r_tag; 454 int32_t r_size; 455 int offset = pdu->offset; 456 int err; 457 458 pdu->offset = 0; 459 460 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 461 if (err) 462 goto rewind_and_exit; 463 464 if (type) 465 *type = r_type; 466 if (tag) 467 *tag = r_tag; 468 if (size) 469 *size = r_size; 470 471 if (pdu->size != r_size || r_size < 7) { 472 err = -EINVAL; 473 goto rewind_and_exit; 474 } 475 476 pdu->id = r_type; 477 pdu->tag = r_tag; 478 479 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 480 pdu->size, pdu->id, pdu->tag); 481 482 rewind_and_exit: 483 if (rewind) 484 pdu->offset = offset; 485 return err; 486 } 487 EXPORT_SYMBOL(p9_parse_header); 488 489 /** 490 * p9_check_errors - check 9p packet for error return and process it 491 * @c: current client instance 492 * @req: request to parse and check for error conditions 493 * 494 * returns error code if one is discovered, otherwise returns 0 495 * 496 * this will have to be more complicated if we have multiple 497 * error packet types 498 */ 499 500 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 501 { 502 int8_t type; 503 int err; 504 int ecode; 505 506 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 507 if (req->rc.size >= c->msize) { 508 p9_debug(P9_DEBUG_ERROR, 509 "requested packet size too big: %d\n", 510 req->rc.size); 511 return -EIO; 512 } 513 /* 514 * dump the response from server 515 * This should be after check errors which poplulate pdu_fcall. 516 */ 517 trace_9p_protocol_dump(c, &req->rc); 518 if (err) { 519 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 520 return err; 521 } 522 if (type != P9_RERROR && type != P9_RLERROR) 523 return 0; 524 525 if (!p9_is_proto_dotl(c)) { 526 char *ename; 527 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 528 &ename, &ecode); 529 if (err) 530 goto out_err; 531 532 if (p9_is_proto_dotu(c) && ecode < 512) 533 err = -ecode; 534 535 if (!err) { 536 err = p9_errstr2errno(ename, strlen(ename)); 537 538 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 539 -ecode, ename); 540 } 541 kfree(ename); 542 } else { 543 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 544 err = -ecode; 545 546 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 547 } 548 549 return err; 550 551 out_err: 552 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 553 554 return err; 555 } 556 557 /** 558 * p9_check_zc_errors - check 9p packet for error return and process it 559 * @c: current client instance 560 * @req: request to parse and check for error conditions 561 * @uidata: external buffer containing error 562 * @in_hdrlen: Size of response protocol buffer. 563 * 564 * returns error code if one is discovered, otherwise returns 0 565 * 566 * this will have to be more complicated if we have multiple 567 * error packet types 568 */ 569 570 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req, 571 struct iov_iter *uidata, int in_hdrlen) 572 { 573 int err; 574 int ecode; 575 int8_t type; 576 char *ename = NULL; 577 578 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 579 /* 580 * dump the response from server 581 * This should be after parse_header which poplulate pdu_fcall. 582 */ 583 trace_9p_protocol_dump(c, &req->rc); 584 if (err) { 585 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 586 return err; 587 } 588 589 if (type != P9_RERROR && type != P9_RLERROR) 590 return 0; 591 592 if (!p9_is_proto_dotl(c)) { 593 /* Error is reported in string format */ 594 int len; 595 /* 7 = header size for RERROR; */ 596 int inline_len = in_hdrlen - 7; 597 598 len = req->rc.size - req->rc.offset; 599 if (len > (P9_ZC_HDR_SZ - 7)) { 600 err = -EFAULT; 601 goto out_err; 602 } 603 604 ename = &req->rc.sdata[req->rc.offset]; 605 if (len > inline_len) { 606 /* We have error in external buffer */ 607 if (!copy_from_iter_full(ename + inline_len, 608 len - inline_len, uidata)) { 609 err = -EFAULT; 610 goto out_err; 611 } 612 } 613 ename = NULL; 614 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 615 &ename, &ecode); 616 if (err) 617 goto out_err; 618 619 if (p9_is_proto_dotu(c) && ecode < 512) 620 err = -ecode; 621 622 if (!err) { 623 err = p9_errstr2errno(ename, strlen(ename)); 624 625 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 626 -ecode, ename); 627 } 628 kfree(ename); 629 } else { 630 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 631 err = -ecode; 632 633 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 634 } 635 return err; 636 637 out_err: 638 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 639 return err; 640 } 641 642 static struct p9_req_t * 643 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 644 645 /** 646 * p9_client_flush - flush (cancel) a request 647 * @c: client state 648 * @oldreq: request to cancel 649 * 650 * This sents a flush for a particular request and links 651 * the flush request to the original request. The current 652 * code only supports a single flush request although the protocol 653 * allows for multiple flush requests to be sent for a single request. 654 * 655 */ 656 657 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 658 { 659 struct p9_req_t *req; 660 int16_t oldtag; 661 int err; 662 663 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); 664 if (err) 665 return err; 666 667 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 668 669 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 670 if (IS_ERR(req)) 671 return PTR_ERR(req); 672 673 /* 674 * if we haven't received a response for oldreq, 675 * remove it from the list 676 */ 677 if (oldreq->status == REQ_STATUS_SENT) { 678 if (c->trans_mod->cancelled) 679 c->trans_mod->cancelled(c, oldreq); 680 } 681 682 p9_tag_remove(c, req); 683 return 0; 684 } 685 686 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 687 int8_t type, int req_size, 688 const char *fmt, va_list ap) 689 { 690 int err; 691 struct p9_req_t *req; 692 693 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 694 695 /* we allow for any status other than disconnected */ 696 if (c->status == Disconnected) 697 return ERR_PTR(-EIO); 698 699 /* if status is begin_disconnected we allow only clunk request */ 700 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) 701 return ERR_PTR(-EIO); 702 703 req = p9_tag_alloc(c, type, req_size); 704 if (IS_ERR(req)) 705 return req; 706 707 /* marshall the data */ 708 p9pdu_prepare(&req->tc, req->tc.tag, type); 709 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); 710 if (err) 711 goto reterr; 712 p9pdu_finalize(c, &req->tc); 713 trace_9p_client_req(c, type, req->tc.tag); 714 return req; 715 reterr: 716 p9_tag_remove(c, req); 717 /* We have to put also the 2nd reference as it won't be used */ 718 p9_req_put(req); 719 return ERR_PTR(err); 720 } 721 722 /** 723 * p9_client_rpc - issue a request and wait for a response 724 * @c: client session 725 * @type: type of request 726 * @fmt: protocol format string (see protocol.c) 727 * 728 * Returns request structure (which client must free using p9_tag_remove) 729 */ 730 731 static struct p9_req_t * 732 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 733 { 734 va_list ap; 735 int sigpending, err; 736 unsigned long flags; 737 struct p9_req_t *req; 738 739 va_start(ap, fmt); 740 req = p9_client_prepare_req(c, type, c->msize, fmt, ap); 741 va_end(ap); 742 if (IS_ERR(req)) 743 return req; 744 745 if (signal_pending(current)) { 746 sigpending = 1; 747 clear_thread_flag(TIF_SIGPENDING); 748 } else 749 sigpending = 0; 750 751 err = c->trans_mod->request(c, req); 752 if (err < 0) { 753 /* write won't happen */ 754 p9_req_put(req); 755 if (err != -ERESTARTSYS && err != -EFAULT) 756 c->status = Disconnected; 757 goto recalc_sigpending; 758 } 759 again: 760 /* Wait for the response */ 761 err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD); 762 763 /* 764 * Make sure our req is coherent with regard to updates in other 765 * threads - echoes to wmb() in the callback 766 */ 767 smp_rmb(); 768 769 if ((err == -ERESTARTSYS) && (c->status == Connected) 770 && (type == P9_TFLUSH)) { 771 sigpending = 1; 772 clear_thread_flag(TIF_SIGPENDING); 773 goto again; 774 } 775 776 if (req->status == REQ_STATUS_ERROR) { 777 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 778 err = req->t_err; 779 } 780 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 781 p9_debug(P9_DEBUG_MUX, "flushing\n"); 782 sigpending = 1; 783 clear_thread_flag(TIF_SIGPENDING); 784 785 if (c->trans_mod->cancel(c, req)) 786 p9_client_flush(c, req); 787 788 /* if we received the response anyway, don't signal error */ 789 if (req->status == REQ_STATUS_RCVD) 790 err = 0; 791 } 792 recalc_sigpending: 793 if (sigpending) { 794 spin_lock_irqsave(¤t->sighand->siglock, flags); 795 recalc_sigpending(); 796 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 797 } 798 if (err < 0) 799 goto reterr; 800 801 err = p9_check_errors(c, req); 802 trace_9p_client_res(c, type, req->rc.tag, err); 803 if (!err) 804 return req; 805 reterr: 806 p9_tag_remove(c, req); 807 return ERR_PTR(safe_errno(err)); 808 } 809 810 /** 811 * p9_client_zc_rpc - issue a request and wait for a response 812 * @c: client session 813 * @type: type of request 814 * @uidata: destination for zero copy read 815 * @uodata: source for zero copy write 816 * @inlen: read buffer size 817 * @olen: write buffer size 818 * @in_hdrlen: reader header size, This is the size of response protocol data 819 * @fmt: protocol format string (see protocol.c) 820 * 821 * Returns request structure (which client must free using p9_tag_remove) 822 */ 823 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 824 struct iov_iter *uidata, 825 struct iov_iter *uodata, 826 int inlen, int olen, int in_hdrlen, 827 const char *fmt, ...) 828 { 829 va_list ap; 830 int sigpending, err; 831 unsigned long flags; 832 struct p9_req_t *req; 833 834 va_start(ap, fmt); 835 /* 836 * We allocate a inline protocol data of only 4k bytes. 837 * The actual content is passed in zero-copy fashion. 838 */ 839 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); 840 va_end(ap); 841 if (IS_ERR(req)) 842 return req; 843 844 if (signal_pending(current)) { 845 sigpending = 1; 846 clear_thread_flag(TIF_SIGPENDING); 847 } else 848 sigpending = 0; 849 850 err = c->trans_mod->zc_request(c, req, uidata, uodata, 851 inlen, olen, in_hdrlen); 852 if (err < 0) { 853 if (err == -EIO) 854 c->status = Disconnected; 855 if (err != -ERESTARTSYS) 856 goto recalc_sigpending; 857 } 858 if (req->status == REQ_STATUS_ERROR) { 859 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 860 err = req->t_err; 861 } 862 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 863 p9_debug(P9_DEBUG_MUX, "flushing\n"); 864 sigpending = 1; 865 clear_thread_flag(TIF_SIGPENDING); 866 867 if (c->trans_mod->cancel(c, req)) 868 p9_client_flush(c, req); 869 870 /* if we received the response anyway, don't signal error */ 871 if (req->status == REQ_STATUS_RCVD) 872 err = 0; 873 } 874 recalc_sigpending: 875 if (sigpending) { 876 spin_lock_irqsave(¤t->sighand->siglock, flags); 877 recalc_sigpending(); 878 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 879 } 880 if (err < 0) 881 goto reterr; 882 883 err = p9_check_zc_errors(c, req, uidata, in_hdrlen); 884 trace_9p_client_res(c, type, req->rc.tag, err); 885 if (!err) 886 return req; 887 reterr: 888 p9_tag_remove(c, req); 889 return ERR_PTR(safe_errno(err)); 890 } 891 892 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 893 { 894 int ret; 895 struct p9_fid *fid; 896 897 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 898 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 899 if (!fid) 900 return NULL; 901 902 memset(&fid->qid, 0, sizeof(struct p9_qid)); 903 fid->mode = -1; 904 fid->uid = current_fsuid(); 905 fid->clnt = clnt; 906 fid->rdir = NULL; 907 fid->fid = 0; 908 refcount_set(&fid->count, 1); 909 910 idr_preload(GFP_KERNEL); 911 spin_lock_irq(&clnt->lock); 912 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, 913 GFP_NOWAIT); 914 spin_unlock_irq(&clnt->lock); 915 idr_preload_end(); 916 if (!ret) 917 return fid; 918 919 kfree(fid); 920 return NULL; 921 } 922 923 static void p9_fid_destroy(struct p9_fid *fid) 924 { 925 struct p9_client *clnt; 926 unsigned long flags; 927 928 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 929 clnt = fid->clnt; 930 spin_lock_irqsave(&clnt->lock, flags); 931 idr_remove(&clnt->fids, fid->fid); 932 spin_unlock_irqrestore(&clnt->lock, flags); 933 kfree(fid->rdir); 934 kfree(fid); 935 } 936 937 static int p9_client_version(struct p9_client *c) 938 { 939 int err = 0; 940 struct p9_req_t *req; 941 char *version = NULL; 942 int msize; 943 944 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 945 c->msize, c->proto_version); 946 947 switch (c->proto_version) { 948 case p9_proto_2000L: 949 req = p9_client_rpc(c, P9_TVERSION, "ds", 950 c->msize, "9P2000.L"); 951 break; 952 case p9_proto_2000u: 953 req = p9_client_rpc(c, P9_TVERSION, "ds", 954 c->msize, "9P2000.u"); 955 break; 956 case p9_proto_legacy: 957 req = p9_client_rpc(c, P9_TVERSION, "ds", 958 c->msize, "9P2000"); 959 break; 960 default: 961 return -EINVAL; 962 } 963 964 if (IS_ERR(req)) 965 return PTR_ERR(req); 966 967 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); 968 if (err) { 969 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 970 trace_9p_protocol_dump(c, &req->rc); 971 goto error; 972 } 973 974 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 975 if (!strncmp(version, "9P2000.L", 8)) 976 c->proto_version = p9_proto_2000L; 977 else if (!strncmp(version, "9P2000.u", 8)) 978 c->proto_version = p9_proto_2000u; 979 else if (!strncmp(version, "9P2000", 6)) 980 c->proto_version = p9_proto_legacy; 981 else { 982 p9_debug(P9_DEBUG_ERROR, 983 "server returned an unknown version: %s\n", version); 984 err = -EREMOTEIO; 985 goto error; 986 } 987 988 if (msize < 4096) { 989 p9_debug(P9_DEBUG_ERROR, 990 "server returned a msize < 4096: %d\n", msize); 991 err = -EREMOTEIO; 992 goto error; 993 } 994 if (msize < c->msize) 995 c->msize = msize; 996 997 error: 998 kfree(version); 999 p9_tag_remove(c, req); 1000 1001 return err; 1002 } 1003 1004 struct p9_client *p9_client_create(const char *dev_name, char *options) 1005 { 1006 int err; 1007 struct p9_client *clnt; 1008 char *client_id; 1009 1010 err = 0; 1011 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 1012 if (!clnt) 1013 return ERR_PTR(-ENOMEM); 1014 1015 clnt->trans_mod = NULL; 1016 clnt->trans = NULL; 1017 clnt->fcall_cache = NULL; 1018 1019 client_id = utsname()->nodename; 1020 memcpy(clnt->name, client_id, strlen(client_id) + 1); 1021 1022 spin_lock_init(&clnt->lock); 1023 idr_init(&clnt->fids); 1024 idr_init(&clnt->reqs); 1025 1026 err = parse_opts(options, clnt); 1027 if (err < 0) 1028 goto free_client; 1029 1030 if (!clnt->trans_mod) 1031 clnt->trans_mod = v9fs_get_default_trans(); 1032 1033 if (clnt->trans_mod == NULL) { 1034 err = -EPROTONOSUPPORT; 1035 p9_debug(P9_DEBUG_ERROR, 1036 "No transport defined or default transport\n"); 1037 goto free_client; 1038 } 1039 1040 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1041 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1042 1043 err = clnt->trans_mod->create(clnt, dev_name, options); 1044 if (err) 1045 goto put_trans; 1046 1047 if (clnt->msize > clnt->trans_mod->maxsize) 1048 clnt->msize = clnt->trans_mod->maxsize; 1049 1050 if (clnt->msize < 4096) { 1051 p9_debug(P9_DEBUG_ERROR, 1052 "Please specify a msize of at least 4k\n"); 1053 err = -EINVAL; 1054 goto close_trans; 1055 } 1056 1057 err = p9_client_version(clnt); 1058 if (err) 1059 goto close_trans; 1060 1061 /* P9_HDRSZ + 4 is the smallest packet header we can have that is 1062 * followed by data accessed from userspace by read 1063 */ 1064 clnt->fcall_cache = 1065 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, 1066 0, 0, P9_HDRSZ + 4, 1067 clnt->msize - (P9_HDRSZ + 4), 1068 NULL); 1069 1070 return clnt; 1071 1072 close_trans: 1073 clnt->trans_mod->close(clnt); 1074 put_trans: 1075 v9fs_put_trans(clnt->trans_mod); 1076 free_client: 1077 kfree(clnt); 1078 return ERR_PTR(err); 1079 } 1080 EXPORT_SYMBOL(p9_client_create); 1081 1082 void p9_client_destroy(struct p9_client *clnt) 1083 { 1084 struct p9_fid *fid; 1085 int id; 1086 1087 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1088 1089 if (clnt->trans_mod) 1090 clnt->trans_mod->close(clnt); 1091 1092 v9fs_put_trans(clnt->trans_mod); 1093 1094 idr_for_each_entry(&clnt->fids, fid, id) { 1095 pr_info("Found fid %d not clunked\n", fid->fid); 1096 p9_fid_destroy(fid); 1097 } 1098 1099 p9_tag_cleanup(clnt); 1100 1101 kmem_cache_destroy(clnt->fcall_cache); 1102 kfree(clnt); 1103 } 1104 EXPORT_SYMBOL(p9_client_destroy); 1105 1106 void p9_client_disconnect(struct p9_client *clnt) 1107 { 1108 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1109 clnt->status = Disconnected; 1110 } 1111 EXPORT_SYMBOL(p9_client_disconnect); 1112 1113 void p9_client_begin_disconnect(struct p9_client *clnt) 1114 { 1115 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1116 clnt->status = BeginDisconnect; 1117 } 1118 EXPORT_SYMBOL(p9_client_begin_disconnect); 1119 1120 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1121 const char *uname, kuid_t n_uname, const char *aname) 1122 { 1123 int err = 0; 1124 struct p9_req_t *req; 1125 struct p9_fid *fid; 1126 struct p9_qid qid; 1127 1128 1129 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1130 afid ? afid->fid : -1, uname, aname); 1131 fid = p9_fid_create(clnt); 1132 if (!fid) { 1133 err = -ENOMEM; 1134 goto error; 1135 } 1136 fid->uid = n_uname; 1137 1138 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1139 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1140 if (IS_ERR(req)) { 1141 err = PTR_ERR(req); 1142 goto error; 1143 } 1144 1145 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); 1146 if (err) { 1147 trace_9p_protocol_dump(clnt, &req->rc); 1148 p9_tag_remove(clnt, req); 1149 goto error; 1150 } 1151 1152 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1153 qid.type, (unsigned long long)qid.path, qid.version); 1154 1155 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1156 1157 p9_tag_remove(clnt, req); 1158 return fid; 1159 1160 error: 1161 if (fid) 1162 p9_fid_destroy(fid); 1163 return ERR_PTR(err); 1164 } 1165 EXPORT_SYMBOL(p9_client_attach); 1166 1167 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1168 const unsigned char * const *wnames, int clone) 1169 { 1170 int err; 1171 struct p9_client *clnt; 1172 struct p9_fid *fid; 1173 struct p9_qid *wqids; 1174 struct p9_req_t *req; 1175 uint16_t nwqids, count; 1176 1177 err = 0; 1178 wqids = NULL; 1179 clnt = oldfid->clnt; 1180 if (clone) { 1181 fid = p9_fid_create(clnt); 1182 if (!fid) { 1183 err = -ENOMEM; 1184 goto error; 1185 } 1186 1187 fid->uid = oldfid->uid; 1188 } else 1189 fid = oldfid; 1190 1191 1192 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1193 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1194 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1195 nwname, wnames); 1196 if (IS_ERR(req)) { 1197 err = PTR_ERR(req); 1198 goto error; 1199 } 1200 1201 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1202 if (err) { 1203 trace_9p_protocol_dump(clnt, &req->rc); 1204 p9_tag_remove(clnt, req); 1205 goto clunk_fid; 1206 } 1207 p9_tag_remove(clnt, req); 1208 1209 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1210 1211 if (nwqids != nwname) { 1212 err = -ENOENT; 1213 goto clunk_fid; 1214 } 1215 1216 for (count = 0; count < nwqids; count++) 1217 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1218 count, wqids[count].type, 1219 (unsigned long long)wqids[count].path, 1220 wqids[count].version); 1221 1222 if (nwname) 1223 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1224 else 1225 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); 1226 1227 kfree(wqids); 1228 return fid; 1229 1230 clunk_fid: 1231 kfree(wqids); 1232 p9_client_clunk(fid); 1233 fid = NULL; 1234 1235 error: 1236 if (fid && (fid != oldfid)) 1237 p9_fid_destroy(fid); 1238 1239 return ERR_PTR(err); 1240 } 1241 EXPORT_SYMBOL(p9_client_walk); 1242 1243 int p9_client_open(struct p9_fid *fid, int mode) 1244 { 1245 int err; 1246 struct p9_client *clnt; 1247 struct p9_req_t *req; 1248 struct p9_qid qid; 1249 int iounit; 1250 1251 clnt = fid->clnt; 1252 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1253 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1254 err = 0; 1255 1256 if (fid->mode != -1) 1257 return -EINVAL; 1258 1259 if (p9_is_proto_dotl(clnt)) 1260 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1261 else 1262 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1263 if (IS_ERR(req)) { 1264 err = PTR_ERR(req); 1265 goto error; 1266 } 1267 1268 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1269 if (err) { 1270 trace_9p_protocol_dump(clnt, &req->rc); 1271 goto free_and_error; 1272 } 1273 1274 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1275 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1276 (unsigned long long)qid.path, qid.version, iounit); 1277 1278 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1279 fid->mode = mode; 1280 fid->iounit = iounit; 1281 1282 free_and_error: 1283 p9_tag_remove(clnt, req); 1284 error: 1285 return err; 1286 } 1287 EXPORT_SYMBOL(p9_client_open); 1288 1289 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode, 1290 kgid_t gid, struct p9_qid *qid) 1291 { 1292 int err = 0; 1293 struct p9_client *clnt; 1294 struct p9_req_t *req; 1295 int iounit; 1296 1297 p9_debug(P9_DEBUG_9P, 1298 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1299 ofid->fid, name, flags, mode, 1300 from_kgid(&init_user_ns, gid)); 1301 clnt = ofid->clnt; 1302 1303 if (ofid->mode != -1) 1304 return -EINVAL; 1305 1306 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1307 mode, gid); 1308 if (IS_ERR(req)) { 1309 err = PTR_ERR(req); 1310 goto error; 1311 } 1312 1313 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); 1314 if (err) { 1315 trace_9p_protocol_dump(clnt, &req->rc); 1316 goto free_and_error; 1317 } 1318 1319 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1320 qid->type, 1321 (unsigned long long)qid->path, 1322 qid->version, iounit); 1323 1324 memmove(&ofid->qid, qid, sizeof(struct p9_qid)); 1325 ofid->mode = mode; 1326 ofid->iounit = iounit; 1327 1328 free_and_error: 1329 p9_tag_remove(clnt, req); 1330 error: 1331 return err; 1332 } 1333 EXPORT_SYMBOL(p9_client_create_dotl); 1334 1335 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1336 char *extension) 1337 { 1338 int err; 1339 struct p9_client *clnt; 1340 struct p9_req_t *req; 1341 struct p9_qid qid; 1342 int iounit; 1343 1344 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1345 fid->fid, name, perm, mode); 1346 err = 0; 1347 clnt = fid->clnt; 1348 1349 if (fid->mode != -1) 1350 return -EINVAL; 1351 1352 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1353 mode, extension); 1354 if (IS_ERR(req)) { 1355 err = PTR_ERR(req); 1356 goto error; 1357 } 1358 1359 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1360 if (err) { 1361 trace_9p_protocol_dump(clnt, &req->rc); 1362 goto free_and_error; 1363 } 1364 1365 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1366 qid.type, 1367 (unsigned long long)qid.path, 1368 qid.version, iounit); 1369 1370 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1371 fid->mode = mode; 1372 fid->iounit = iounit; 1373 1374 free_and_error: 1375 p9_tag_remove(clnt, req); 1376 error: 1377 return err; 1378 } 1379 EXPORT_SYMBOL(p9_client_fcreate); 1380 1381 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1382 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1383 { 1384 int err = 0; 1385 struct p9_client *clnt; 1386 struct p9_req_t *req; 1387 1388 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1389 dfid->fid, name, symtgt); 1390 clnt = dfid->clnt; 1391 1392 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1393 gid); 1394 if (IS_ERR(req)) { 1395 err = PTR_ERR(req); 1396 goto error; 1397 } 1398 1399 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 1400 if (err) { 1401 trace_9p_protocol_dump(clnt, &req->rc); 1402 goto free_and_error; 1403 } 1404 1405 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1406 qid->type, (unsigned long long)qid->path, qid->version); 1407 1408 free_and_error: 1409 p9_tag_remove(clnt, req); 1410 error: 1411 return err; 1412 } 1413 EXPORT_SYMBOL(p9_client_symlink); 1414 1415 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1416 { 1417 struct p9_client *clnt; 1418 struct p9_req_t *req; 1419 1420 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1421 dfid->fid, oldfid->fid, newname); 1422 clnt = dfid->clnt; 1423 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1424 newname); 1425 if (IS_ERR(req)) 1426 return PTR_ERR(req); 1427 1428 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1429 p9_tag_remove(clnt, req); 1430 return 0; 1431 } 1432 EXPORT_SYMBOL(p9_client_link); 1433 1434 int p9_client_fsync(struct p9_fid *fid, int datasync) 1435 { 1436 int err; 1437 struct p9_client *clnt; 1438 struct p9_req_t *req; 1439 1440 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1441 fid->fid, datasync); 1442 err = 0; 1443 clnt = fid->clnt; 1444 1445 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1446 if (IS_ERR(req)) { 1447 err = PTR_ERR(req); 1448 goto error; 1449 } 1450 1451 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1452 1453 p9_tag_remove(clnt, req); 1454 1455 error: 1456 return err; 1457 } 1458 EXPORT_SYMBOL(p9_client_fsync); 1459 1460 int p9_client_clunk(struct p9_fid *fid) 1461 { 1462 int err; 1463 struct p9_client *clnt; 1464 struct p9_req_t *req; 1465 int retries = 0; 1466 1467 if (!fid || IS_ERR(fid)) { 1468 pr_warn("%s (%d): Trying to clunk with invalid fid\n", 1469 __func__, task_pid_nr(current)); 1470 dump_stack(); 1471 return 0; 1472 } 1473 if (!refcount_dec_and_test(&fid->count)) 1474 return 0; 1475 1476 again: 1477 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid, 1478 retries); 1479 err = 0; 1480 clnt = fid->clnt; 1481 1482 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1483 if (IS_ERR(req)) { 1484 err = PTR_ERR(req); 1485 goto error; 1486 } 1487 1488 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1489 1490 p9_tag_remove(clnt, req); 1491 error: 1492 /* 1493 * Fid is not valid even after a failed clunk 1494 * If interrupted, retry once then give up and 1495 * leak fid until umount. 1496 */ 1497 if (err == -ERESTARTSYS) { 1498 if (retries++ == 0) 1499 goto again; 1500 } else 1501 p9_fid_destroy(fid); 1502 return err; 1503 } 1504 EXPORT_SYMBOL(p9_client_clunk); 1505 1506 int p9_client_remove(struct p9_fid *fid) 1507 { 1508 int err; 1509 struct p9_client *clnt; 1510 struct p9_req_t *req; 1511 1512 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1513 err = 0; 1514 clnt = fid->clnt; 1515 1516 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1517 if (IS_ERR(req)) { 1518 err = PTR_ERR(req); 1519 goto error; 1520 } 1521 1522 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1523 1524 p9_tag_remove(clnt, req); 1525 error: 1526 if (err == -ERESTARTSYS) 1527 p9_client_clunk(fid); 1528 else 1529 p9_fid_destroy(fid); 1530 return err; 1531 } 1532 EXPORT_SYMBOL(p9_client_remove); 1533 1534 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1535 { 1536 int err = 0; 1537 struct p9_req_t *req; 1538 struct p9_client *clnt; 1539 1540 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1541 dfid->fid, name, flags); 1542 1543 clnt = dfid->clnt; 1544 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1545 if (IS_ERR(req)) { 1546 err = PTR_ERR(req); 1547 goto error; 1548 } 1549 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1550 1551 p9_tag_remove(clnt, req); 1552 error: 1553 return err; 1554 } 1555 EXPORT_SYMBOL(p9_client_unlinkat); 1556 1557 int 1558 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1559 { 1560 int total = 0; 1561 *err = 0; 1562 1563 while (iov_iter_count(to)) { 1564 int count; 1565 1566 count = p9_client_read_once(fid, offset, to, err); 1567 if (!count || *err) 1568 break; 1569 offset += count; 1570 total += count; 1571 } 1572 return total; 1573 } 1574 EXPORT_SYMBOL(p9_client_read); 1575 1576 int 1577 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, 1578 int *err) 1579 { 1580 struct p9_client *clnt = fid->clnt; 1581 struct p9_req_t *req; 1582 int count = iov_iter_count(to); 1583 int rsize, non_zc = 0; 1584 char *dataptr; 1585 1586 *err = 0; 1587 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", 1588 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to)); 1589 1590 rsize = fid->iounit; 1591 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1592 rsize = clnt->msize - P9_IOHDRSZ; 1593 1594 if (count < rsize) 1595 rsize = count; 1596 1597 /* Don't bother zerocopy for small IO (< 1024) */ 1598 if (clnt->trans_mod->zc_request && rsize > 1024) { 1599 /* response header len is 11 1600 * PDU Header(7) + IO Size (4) 1601 */ 1602 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1603 0, 11, "dqd", fid->fid, 1604 offset, rsize); 1605 } else { 1606 non_zc = 1; 1607 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1608 rsize); 1609 } 1610 if (IS_ERR(req)) { 1611 *err = PTR_ERR(req); 1612 return 0; 1613 } 1614 1615 *err = p9pdu_readf(&req->rc, clnt->proto_version, 1616 "D", &count, &dataptr); 1617 if (*err) { 1618 trace_9p_protocol_dump(clnt, &req->rc); 1619 p9_tag_remove(clnt, req); 1620 return 0; 1621 } 1622 if (rsize < count) { 1623 pr_err("bogus RREAD count (%d > %d)\n", count, rsize); 1624 count = rsize; 1625 } 1626 1627 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1628 1629 if (non_zc) { 1630 int n = copy_to_iter(dataptr, count, to); 1631 1632 if (n != count) { 1633 *err = -EFAULT; 1634 p9_tag_remove(clnt, req); 1635 return n; 1636 } 1637 } else { 1638 iov_iter_advance(to, count); 1639 } 1640 p9_tag_remove(clnt, req); 1641 return count; 1642 } 1643 EXPORT_SYMBOL(p9_client_read_once); 1644 1645 int 1646 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1647 { 1648 struct p9_client *clnt = fid->clnt; 1649 struct p9_req_t *req; 1650 int total = 0; 1651 *err = 0; 1652 1653 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", 1654 fid->fid, (unsigned long long) offset, 1655 iov_iter_count(from)); 1656 1657 while (iov_iter_count(from)) { 1658 int count = iov_iter_count(from); 1659 int rsize = fid->iounit; 1660 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1661 rsize = clnt->msize - P9_IOHDRSZ; 1662 1663 if (count < rsize) 1664 rsize = count; 1665 1666 /* Don't bother zerocopy for small IO (< 1024) */ 1667 if (clnt->trans_mod->zc_request && rsize > 1024) { 1668 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1669 rsize, P9_ZC_HDR_SZ, "dqd", 1670 fid->fid, offset, rsize); 1671 } else { 1672 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1673 offset, rsize, from); 1674 } 1675 if (IS_ERR(req)) { 1676 *err = PTR_ERR(req); 1677 break; 1678 } 1679 1680 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count); 1681 if (*err) { 1682 trace_9p_protocol_dump(clnt, &req->rc); 1683 p9_tag_remove(clnt, req); 1684 break; 1685 } 1686 if (rsize < count) { 1687 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize); 1688 count = rsize; 1689 } 1690 1691 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1692 1693 p9_tag_remove(clnt, req); 1694 iov_iter_advance(from, count); 1695 total += count; 1696 offset += count; 1697 } 1698 return total; 1699 } 1700 EXPORT_SYMBOL(p9_client_write); 1701 1702 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1703 { 1704 int err; 1705 struct p9_client *clnt; 1706 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1707 struct p9_req_t *req; 1708 u16 ignored; 1709 1710 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1711 1712 if (!ret) 1713 return ERR_PTR(-ENOMEM); 1714 1715 err = 0; 1716 clnt = fid->clnt; 1717 1718 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1719 if (IS_ERR(req)) { 1720 err = PTR_ERR(req); 1721 goto error; 1722 } 1723 1724 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); 1725 if (err) { 1726 trace_9p_protocol_dump(clnt, &req->rc); 1727 p9_tag_remove(clnt, req); 1728 goto error; 1729 } 1730 1731 p9_debug(P9_DEBUG_9P, 1732 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1733 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1734 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1735 "<<< uid=%d gid=%d n_muid=%d\n", 1736 ret->size, ret->type, ret->dev, ret->qid.type, 1737 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1738 ret->atime, ret->mtime, (unsigned long long)ret->length, 1739 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1740 from_kuid(&init_user_ns, ret->n_uid), 1741 from_kgid(&init_user_ns, ret->n_gid), 1742 from_kuid(&init_user_ns, ret->n_muid)); 1743 1744 p9_tag_remove(clnt, req); 1745 return ret; 1746 1747 error: 1748 kfree(ret); 1749 return ERR_PTR(err); 1750 } 1751 EXPORT_SYMBOL(p9_client_stat); 1752 1753 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1754 u64 request_mask) 1755 { 1756 int err; 1757 struct p9_client *clnt; 1758 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1759 GFP_KERNEL); 1760 struct p9_req_t *req; 1761 1762 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1763 fid->fid, request_mask); 1764 1765 if (!ret) 1766 return ERR_PTR(-ENOMEM); 1767 1768 err = 0; 1769 clnt = fid->clnt; 1770 1771 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1772 if (IS_ERR(req)) { 1773 err = PTR_ERR(req); 1774 goto error; 1775 } 1776 1777 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); 1778 if (err) { 1779 trace_9p_protocol_dump(clnt, &req->rc); 1780 p9_tag_remove(clnt, req); 1781 goto error; 1782 } 1783 1784 p9_debug(P9_DEBUG_9P, 1785 "<<< RGETATTR st_result_mask=%lld\n" 1786 "<<< qid=%x.%llx.%x\n" 1787 "<<< st_mode=%8.8x st_nlink=%llu\n" 1788 "<<< st_uid=%d st_gid=%d\n" 1789 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1790 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1791 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1792 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1793 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1794 "<<< st_gen=%lld st_data_version=%lld\n", 1795 ret->st_result_mask, ret->qid.type, ret->qid.path, 1796 ret->qid.version, ret->st_mode, ret->st_nlink, 1797 from_kuid(&init_user_ns, ret->st_uid), 1798 from_kgid(&init_user_ns, ret->st_gid), 1799 ret->st_rdev, ret->st_size, ret->st_blksize, 1800 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1801 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1802 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1803 ret->st_gen, ret->st_data_version); 1804 1805 p9_tag_remove(clnt, req); 1806 return ret; 1807 1808 error: 1809 kfree(ret); 1810 return ERR_PTR(err); 1811 } 1812 EXPORT_SYMBOL(p9_client_getattr_dotl); 1813 1814 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1815 { 1816 int ret; 1817 1818 /* NOTE: size shouldn't include its own length */ 1819 /* size[2] type[2] dev[4] qid[13] */ 1820 /* mode[4] atime[4] mtime[4] length[8]*/ 1821 /* name[s] uid[s] gid[s] muid[s] */ 1822 ret = 2+4+13+4+4+4+8+2+2+2+2; 1823 1824 if (wst->name) 1825 ret += strlen(wst->name); 1826 if (wst->uid) 1827 ret += strlen(wst->uid); 1828 if (wst->gid) 1829 ret += strlen(wst->gid); 1830 if (wst->muid) 1831 ret += strlen(wst->muid); 1832 1833 if ((proto_version == p9_proto_2000u) || 1834 (proto_version == p9_proto_2000L)) { 1835 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1836 if (wst->extension) 1837 ret += strlen(wst->extension); 1838 } 1839 1840 return ret; 1841 } 1842 1843 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1844 { 1845 int err; 1846 struct p9_req_t *req; 1847 struct p9_client *clnt; 1848 1849 err = 0; 1850 clnt = fid->clnt; 1851 wst->size = p9_client_statsize(wst, clnt->proto_version); 1852 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1853 p9_debug(P9_DEBUG_9P, 1854 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1855 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1856 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1857 " uid=%d gid=%d n_muid=%d\n", 1858 wst->size, wst->type, wst->dev, wst->qid.type, 1859 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1860 wst->atime, wst->mtime, (unsigned long long)wst->length, 1861 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1862 from_kuid(&init_user_ns, wst->n_uid), 1863 from_kgid(&init_user_ns, wst->n_gid), 1864 from_kuid(&init_user_ns, wst->n_muid)); 1865 1866 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1867 if (IS_ERR(req)) { 1868 err = PTR_ERR(req); 1869 goto error; 1870 } 1871 1872 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1873 1874 p9_tag_remove(clnt, req); 1875 error: 1876 return err; 1877 } 1878 EXPORT_SYMBOL(p9_client_wstat); 1879 1880 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1881 { 1882 int err; 1883 struct p9_req_t *req; 1884 struct p9_client *clnt; 1885 1886 err = 0; 1887 clnt = fid->clnt; 1888 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1889 p9_debug(P9_DEBUG_9P, 1890 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1891 " atime_sec=%lld atime_nsec=%lld\n" 1892 " mtime_sec=%lld mtime_nsec=%lld\n", 1893 p9attr->valid, p9attr->mode, 1894 from_kuid(&init_user_ns, p9attr->uid), 1895 from_kgid(&init_user_ns, p9attr->gid), 1896 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1897 p9attr->mtime_sec, p9attr->mtime_nsec); 1898 1899 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1900 1901 if (IS_ERR(req)) { 1902 err = PTR_ERR(req); 1903 goto error; 1904 } 1905 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1906 p9_tag_remove(clnt, req); 1907 error: 1908 return err; 1909 } 1910 EXPORT_SYMBOL(p9_client_setattr); 1911 1912 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1913 { 1914 int err; 1915 struct p9_req_t *req; 1916 struct p9_client *clnt; 1917 1918 err = 0; 1919 clnt = fid->clnt; 1920 1921 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1922 1923 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1924 if (IS_ERR(req)) { 1925 err = PTR_ERR(req); 1926 goto error; 1927 } 1928 1929 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1930 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1931 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1932 if (err) { 1933 trace_9p_protocol_dump(clnt, &req->rc); 1934 p9_tag_remove(clnt, req); 1935 goto error; 1936 } 1937 1938 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1939 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1940 "fsid %llu namelen %ld\n", 1941 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1942 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1943 sb->fsid, (long int)sb->namelen); 1944 1945 p9_tag_remove(clnt, req); 1946 error: 1947 return err; 1948 } 1949 EXPORT_SYMBOL(p9_client_statfs); 1950 1951 int p9_client_rename(struct p9_fid *fid, 1952 struct p9_fid *newdirfid, const char *name) 1953 { 1954 int err; 1955 struct p9_req_t *req; 1956 struct p9_client *clnt; 1957 1958 err = 0; 1959 clnt = fid->clnt; 1960 1961 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1962 fid->fid, newdirfid->fid, name); 1963 1964 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1965 newdirfid->fid, name); 1966 if (IS_ERR(req)) { 1967 err = PTR_ERR(req); 1968 goto error; 1969 } 1970 1971 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1972 1973 p9_tag_remove(clnt, req); 1974 error: 1975 return err; 1976 } 1977 EXPORT_SYMBOL(p9_client_rename); 1978 1979 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1980 struct p9_fid *newdirfid, const char *new_name) 1981 { 1982 int err; 1983 struct p9_req_t *req; 1984 struct p9_client *clnt; 1985 1986 err = 0; 1987 clnt = olddirfid->clnt; 1988 1989 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" 1990 " newdirfid %d new name %s\n", olddirfid->fid, old_name, 1991 newdirfid->fid, new_name); 1992 1993 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1994 old_name, newdirfid->fid, new_name); 1995 if (IS_ERR(req)) { 1996 err = PTR_ERR(req); 1997 goto error; 1998 } 1999 2000 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 2001 newdirfid->fid, new_name); 2002 2003 p9_tag_remove(clnt, req); 2004 error: 2005 return err; 2006 } 2007 EXPORT_SYMBOL(p9_client_renameat); 2008 2009 /* 2010 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 2011 */ 2012 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 2013 const char *attr_name, u64 *attr_size) 2014 { 2015 int err; 2016 struct p9_req_t *req; 2017 struct p9_client *clnt; 2018 struct p9_fid *attr_fid; 2019 2020 err = 0; 2021 clnt = file_fid->clnt; 2022 attr_fid = p9_fid_create(clnt); 2023 if (!attr_fid) { 2024 err = -ENOMEM; 2025 goto error; 2026 } 2027 p9_debug(P9_DEBUG_9P, 2028 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 2029 file_fid->fid, attr_fid->fid, attr_name); 2030 2031 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 2032 file_fid->fid, attr_fid->fid, attr_name); 2033 if (IS_ERR(req)) { 2034 err = PTR_ERR(req); 2035 goto error; 2036 } 2037 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); 2038 if (err) { 2039 trace_9p_protocol_dump(clnt, &req->rc); 2040 p9_tag_remove(clnt, req); 2041 goto clunk_fid; 2042 } 2043 p9_tag_remove(clnt, req); 2044 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2045 attr_fid->fid, *attr_size); 2046 return attr_fid; 2047 clunk_fid: 2048 p9_client_clunk(attr_fid); 2049 attr_fid = NULL; 2050 error: 2051 if (attr_fid && (attr_fid != file_fid)) 2052 p9_fid_destroy(attr_fid); 2053 2054 return ERR_PTR(err); 2055 } 2056 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2057 2058 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2059 u64 attr_size, int flags) 2060 { 2061 int err; 2062 struct p9_req_t *req; 2063 struct p9_client *clnt; 2064 2065 p9_debug(P9_DEBUG_9P, 2066 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 2067 fid->fid, name, (long long)attr_size, flags); 2068 err = 0; 2069 clnt = fid->clnt; 2070 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2071 fid->fid, name, attr_size, flags); 2072 if (IS_ERR(req)) { 2073 err = PTR_ERR(req); 2074 goto error; 2075 } 2076 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2077 p9_tag_remove(clnt, req); 2078 error: 2079 return err; 2080 } 2081 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2082 2083 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2084 { 2085 int err, rsize, non_zc = 0; 2086 struct p9_client *clnt; 2087 struct p9_req_t *req; 2088 char *dataptr; 2089 struct kvec kv = {.iov_base = data, .iov_len = count}; 2090 struct iov_iter to; 2091 2092 iov_iter_kvec(&to, READ, &kv, 1, count); 2093 2094 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2095 fid->fid, (unsigned long long) offset, count); 2096 2097 err = 0; 2098 clnt = fid->clnt; 2099 2100 rsize = fid->iounit; 2101 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 2102 rsize = clnt->msize - P9_READDIRHDRSZ; 2103 2104 if (count < rsize) 2105 rsize = count; 2106 2107 /* Don't bother zerocopy for small IO (< 1024) */ 2108 if (clnt->trans_mod->zc_request && rsize > 1024) { 2109 /* 2110 * response header len is 11 2111 * PDU Header(7) + IO Size (4) 2112 */ 2113 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2114 11, "dqd", fid->fid, offset, rsize); 2115 } else { 2116 non_zc = 1; 2117 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2118 offset, rsize); 2119 } 2120 if (IS_ERR(req)) { 2121 err = PTR_ERR(req); 2122 goto error; 2123 } 2124 2125 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); 2126 if (err) { 2127 trace_9p_protocol_dump(clnt, &req->rc); 2128 goto free_and_error; 2129 } 2130 if (rsize < count) { 2131 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2132 count = rsize; 2133 } 2134 2135 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2136 2137 if (non_zc) 2138 memmove(data, dataptr, count); 2139 2140 p9_tag_remove(clnt, req); 2141 return count; 2142 2143 free_and_error: 2144 p9_tag_remove(clnt, req); 2145 error: 2146 return err; 2147 } 2148 EXPORT_SYMBOL(p9_client_readdir); 2149 2150 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2151 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2152 { 2153 int err; 2154 struct p9_client *clnt; 2155 struct p9_req_t *req; 2156 2157 err = 0; 2158 clnt = fid->clnt; 2159 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 2160 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2161 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2162 MAJOR(rdev), MINOR(rdev), gid); 2163 if (IS_ERR(req)) 2164 return PTR_ERR(req); 2165 2166 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2167 if (err) { 2168 trace_9p_protocol_dump(clnt, &req->rc); 2169 goto error; 2170 } 2171 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 2172 (unsigned long long)qid->path, qid->version); 2173 2174 error: 2175 p9_tag_remove(clnt, req); 2176 return err; 2177 2178 } 2179 EXPORT_SYMBOL(p9_client_mknod_dotl); 2180 2181 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2182 kgid_t gid, struct p9_qid *qid) 2183 { 2184 int err; 2185 struct p9_client *clnt; 2186 struct p9_req_t *req; 2187 2188 err = 0; 2189 clnt = fid->clnt; 2190 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2191 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2192 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode, 2193 gid); 2194 if (IS_ERR(req)) 2195 return PTR_ERR(req); 2196 2197 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2198 if (err) { 2199 trace_9p_protocol_dump(clnt, &req->rc); 2200 goto error; 2201 } 2202 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2203 (unsigned long long)qid->path, qid->version); 2204 2205 error: 2206 p9_tag_remove(clnt, req); 2207 return err; 2208 2209 } 2210 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2211 2212 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2213 { 2214 int err; 2215 struct p9_client *clnt; 2216 struct p9_req_t *req; 2217 2218 err = 0; 2219 clnt = fid->clnt; 2220 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " 2221 "start %lld length %lld proc_id %d client_id %s\n", 2222 fid->fid, flock->type, flock->flags, flock->start, 2223 flock->length, flock->proc_id, flock->client_id); 2224 2225 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2226 flock->flags, flock->start, flock->length, 2227 flock->proc_id, flock->client_id); 2228 2229 if (IS_ERR(req)) 2230 return PTR_ERR(req); 2231 2232 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); 2233 if (err) { 2234 trace_9p_protocol_dump(clnt, &req->rc); 2235 goto error; 2236 } 2237 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2238 error: 2239 p9_tag_remove(clnt, req); 2240 return err; 2241 2242 } 2243 EXPORT_SYMBOL(p9_client_lock_dotl); 2244 2245 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2246 { 2247 int err; 2248 struct p9_client *clnt; 2249 struct p9_req_t *req; 2250 2251 err = 0; 2252 clnt = fid->clnt; 2253 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " 2254 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, 2255 glock->start, glock->length, glock->proc_id, glock->client_id); 2256 2257 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, 2258 glock->start, glock->length, glock->proc_id, glock->client_id); 2259 2260 if (IS_ERR(req)) 2261 return PTR_ERR(req); 2262 2263 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, 2264 &glock->start, &glock->length, &glock->proc_id, 2265 &glock->client_id); 2266 if (err) { 2267 trace_9p_protocol_dump(clnt, &req->rc); 2268 goto error; 2269 } 2270 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " 2271 "proc_id %d client_id %s\n", glock->type, glock->start, 2272 glock->length, glock->proc_id, glock->client_id); 2273 error: 2274 p9_tag_remove(clnt, req); 2275 return err; 2276 } 2277 EXPORT_SYMBOL(p9_client_getlock_dotl); 2278 2279 int p9_client_readlink(struct p9_fid *fid, char **target) 2280 { 2281 int err; 2282 struct p9_client *clnt; 2283 struct p9_req_t *req; 2284 2285 err = 0; 2286 clnt = fid->clnt; 2287 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2288 2289 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2290 if (IS_ERR(req)) 2291 return PTR_ERR(req); 2292 2293 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); 2294 if (err) { 2295 trace_9p_protocol_dump(clnt, &req->rc); 2296 goto error; 2297 } 2298 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2299 error: 2300 p9_tag_remove(clnt, req); 2301 return err; 2302 } 2303 EXPORT_SYMBOL(p9_client_readlink); 2304 2305 int __init p9_client_init(void) 2306 { 2307 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); 2308 return p9_req_cache ? 0 : -ENOMEM; 2309 } 2310 2311 void __exit p9_client_exit(void) 2312 { 2313 kmem_cache_destroy(p9_req_cache); 2314 } 2315