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 if (err) 545 goto out_err; 546 err = -ecode; 547 548 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 549 } 550 551 return err; 552 553 out_err: 554 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 555 556 return err; 557 } 558 559 /** 560 * p9_check_zc_errors - check 9p packet for error return and process it 561 * @c: current client instance 562 * @req: request to parse and check for error conditions 563 * @uidata: external buffer containing error 564 * @in_hdrlen: Size of response protocol buffer. 565 * 566 * returns error code if one is discovered, otherwise returns 0 567 * 568 * this will have to be more complicated if we have multiple 569 * error packet types 570 */ 571 572 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req, 573 struct iov_iter *uidata, int in_hdrlen) 574 { 575 int err; 576 int ecode; 577 int8_t type; 578 char *ename = NULL; 579 580 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 581 /* 582 * dump the response from server 583 * This should be after parse_header which poplulate pdu_fcall. 584 */ 585 trace_9p_protocol_dump(c, &req->rc); 586 if (err) { 587 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 588 return err; 589 } 590 591 if (type != P9_RERROR && type != P9_RLERROR) 592 return 0; 593 594 if (!p9_is_proto_dotl(c)) { 595 /* Error is reported in string format */ 596 int len; 597 /* 7 = header size for RERROR; */ 598 int inline_len = in_hdrlen - 7; 599 600 len = req->rc.size - req->rc.offset; 601 if (len > (P9_ZC_HDR_SZ - 7)) { 602 err = -EFAULT; 603 goto out_err; 604 } 605 606 ename = &req->rc.sdata[req->rc.offset]; 607 if (len > inline_len) { 608 /* We have error in external buffer */ 609 if (!copy_from_iter_full(ename + inline_len, 610 len - inline_len, uidata)) { 611 err = -EFAULT; 612 goto out_err; 613 } 614 } 615 ename = NULL; 616 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 617 &ename, &ecode); 618 if (err) 619 goto out_err; 620 621 if (p9_is_proto_dotu(c) && ecode < 512) 622 err = -ecode; 623 624 if (!err) { 625 err = p9_errstr2errno(ename, strlen(ename)); 626 627 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 628 -ecode, ename); 629 } 630 kfree(ename); 631 } else { 632 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 633 err = -ecode; 634 635 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 636 } 637 return err; 638 639 out_err: 640 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 641 return err; 642 } 643 644 static struct p9_req_t * 645 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 646 647 /** 648 * p9_client_flush - flush (cancel) a request 649 * @c: client state 650 * @oldreq: request to cancel 651 * 652 * This sents a flush for a particular request and links 653 * the flush request to the original request. The current 654 * code only supports a single flush request although the protocol 655 * allows for multiple flush requests to be sent for a single request. 656 * 657 */ 658 659 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 660 { 661 struct p9_req_t *req; 662 int16_t oldtag; 663 int err; 664 665 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); 666 if (err) 667 return err; 668 669 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 670 671 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 672 if (IS_ERR(req)) 673 return PTR_ERR(req); 674 675 /* 676 * if we haven't received a response for oldreq, 677 * remove it from the list 678 */ 679 if (oldreq->status == REQ_STATUS_SENT) { 680 if (c->trans_mod->cancelled) 681 c->trans_mod->cancelled(c, oldreq); 682 } 683 684 p9_tag_remove(c, req); 685 return 0; 686 } 687 688 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 689 int8_t type, int req_size, 690 const char *fmt, va_list ap) 691 { 692 int err; 693 struct p9_req_t *req; 694 695 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 696 697 /* we allow for any status other than disconnected */ 698 if (c->status == Disconnected) 699 return ERR_PTR(-EIO); 700 701 /* if status is begin_disconnected we allow only clunk request */ 702 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) 703 return ERR_PTR(-EIO); 704 705 req = p9_tag_alloc(c, type, req_size); 706 if (IS_ERR(req)) 707 return req; 708 709 /* marshall the data */ 710 p9pdu_prepare(&req->tc, req->tc.tag, type); 711 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); 712 if (err) 713 goto reterr; 714 p9pdu_finalize(c, &req->tc); 715 trace_9p_client_req(c, type, req->tc.tag); 716 return req; 717 reterr: 718 p9_tag_remove(c, req); 719 /* We have to put also the 2nd reference as it won't be used */ 720 p9_req_put(req); 721 return ERR_PTR(err); 722 } 723 724 /** 725 * p9_client_rpc - issue a request and wait for a response 726 * @c: client session 727 * @type: type of request 728 * @fmt: protocol format string (see protocol.c) 729 * 730 * Returns request structure (which client must free using p9_tag_remove) 731 */ 732 733 static struct p9_req_t * 734 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 735 { 736 va_list ap; 737 int sigpending, err; 738 unsigned long flags; 739 struct p9_req_t *req; 740 741 va_start(ap, fmt); 742 req = p9_client_prepare_req(c, type, c->msize, fmt, ap); 743 va_end(ap); 744 if (IS_ERR(req)) 745 return req; 746 747 if (signal_pending(current)) { 748 sigpending = 1; 749 clear_thread_flag(TIF_SIGPENDING); 750 } else 751 sigpending = 0; 752 753 err = c->trans_mod->request(c, req); 754 if (err < 0) { 755 /* write won't happen */ 756 p9_req_put(req); 757 if (err != -ERESTARTSYS && err != -EFAULT) 758 c->status = Disconnected; 759 goto recalc_sigpending; 760 } 761 again: 762 /* Wait for the response */ 763 err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD); 764 765 /* 766 * Make sure our req is coherent with regard to updates in other 767 * threads - echoes to wmb() in the callback 768 */ 769 smp_rmb(); 770 771 if ((err == -ERESTARTSYS) && (c->status == Connected) 772 && (type == P9_TFLUSH)) { 773 sigpending = 1; 774 clear_thread_flag(TIF_SIGPENDING); 775 goto again; 776 } 777 778 if (req->status == REQ_STATUS_ERROR) { 779 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 780 err = req->t_err; 781 } 782 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 783 p9_debug(P9_DEBUG_MUX, "flushing\n"); 784 sigpending = 1; 785 clear_thread_flag(TIF_SIGPENDING); 786 787 if (c->trans_mod->cancel(c, req)) 788 p9_client_flush(c, req); 789 790 /* if we received the response anyway, don't signal error */ 791 if (req->status == REQ_STATUS_RCVD) 792 err = 0; 793 } 794 recalc_sigpending: 795 if (sigpending) { 796 spin_lock_irqsave(¤t->sighand->siglock, flags); 797 recalc_sigpending(); 798 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 799 } 800 if (err < 0) 801 goto reterr; 802 803 err = p9_check_errors(c, req); 804 trace_9p_client_res(c, type, req->rc.tag, err); 805 if (!err) 806 return req; 807 reterr: 808 p9_tag_remove(c, req); 809 return ERR_PTR(safe_errno(err)); 810 } 811 812 /** 813 * p9_client_zc_rpc - issue a request and wait for a response 814 * @c: client session 815 * @type: type of request 816 * @uidata: destination for zero copy read 817 * @uodata: source for zero copy write 818 * @inlen: read buffer size 819 * @olen: write buffer size 820 * @in_hdrlen: reader header size, This is the size of response protocol data 821 * @fmt: protocol format string (see protocol.c) 822 * 823 * Returns request structure (which client must free using p9_tag_remove) 824 */ 825 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 826 struct iov_iter *uidata, 827 struct iov_iter *uodata, 828 int inlen, int olen, int in_hdrlen, 829 const char *fmt, ...) 830 { 831 va_list ap; 832 int sigpending, err; 833 unsigned long flags; 834 struct p9_req_t *req; 835 836 va_start(ap, fmt); 837 /* 838 * We allocate a inline protocol data of only 4k bytes. 839 * The actual content is passed in zero-copy fashion. 840 */ 841 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); 842 va_end(ap); 843 if (IS_ERR(req)) 844 return req; 845 846 if (signal_pending(current)) { 847 sigpending = 1; 848 clear_thread_flag(TIF_SIGPENDING); 849 } else 850 sigpending = 0; 851 852 err = c->trans_mod->zc_request(c, req, uidata, uodata, 853 inlen, olen, in_hdrlen); 854 if (err < 0) { 855 if (err == -EIO) 856 c->status = Disconnected; 857 if (err != -ERESTARTSYS) 858 goto recalc_sigpending; 859 } 860 if (req->status == REQ_STATUS_ERROR) { 861 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 862 err = req->t_err; 863 } 864 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 865 p9_debug(P9_DEBUG_MUX, "flushing\n"); 866 sigpending = 1; 867 clear_thread_flag(TIF_SIGPENDING); 868 869 if (c->trans_mod->cancel(c, req)) 870 p9_client_flush(c, req); 871 872 /* if we received the response anyway, don't signal error */ 873 if (req->status == REQ_STATUS_RCVD) 874 err = 0; 875 } 876 recalc_sigpending: 877 if (sigpending) { 878 spin_lock_irqsave(¤t->sighand->siglock, flags); 879 recalc_sigpending(); 880 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 881 } 882 if (err < 0) 883 goto reterr; 884 885 err = p9_check_zc_errors(c, req, uidata, in_hdrlen); 886 trace_9p_client_res(c, type, req->rc.tag, err); 887 if (!err) 888 return req; 889 reterr: 890 p9_tag_remove(c, req); 891 return ERR_PTR(safe_errno(err)); 892 } 893 894 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 895 { 896 int ret; 897 struct p9_fid *fid; 898 899 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 900 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 901 if (!fid) 902 return NULL; 903 904 memset(&fid->qid, 0, sizeof(struct p9_qid)); 905 fid->mode = -1; 906 fid->uid = current_fsuid(); 907 fid->clnt = clnt; 908 fid->rdir = NULL; 909 fid->fid = 0; 910 refcount_set(&fid->count, 1); 911 912 idr_preload(GFP_KERNEL); 913 spin_lock_irq(&clnt->lock); 914 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, 915 GFP_NOWAIT); 916 spin_unlock_irq(&clnt->lock); 917 idr_preload_end(); 918 if (!ret) 919 return fid; 920 921 kfree(fid); 922 return NULL; 923 } 924 925 static void p9_fid_destroy(struct p9_fid *fid) 926 { 927 struct p9_client *clnt; 928 unsigned long flags; 929 930 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 931 clnt = fid->clnt; 932 spin_lock_irqsave(&clnt->lock, flags); 933 idr_remove(&clnt->fids, fid->fid); 934 spin_unlock_irqrestore(&clnt->lock, flags); 935 kfree(fid->rdir); 936 kfree(fid); 937 } 938 939 static int p9_client_version(struct p9_client *c) 940 { 941 int err = 0; 942 struct p9_req_t *req; 943 char *version = NULL; 944 int msize; 945 946 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 947 c->msize, c->proto_version); 948 949 switch (c->proto_version) { 950 case p9_proto_2000L: 951 req = p9_client_rpc(c, P9_TVERSION, "ds", 952 c->msize, "9P2000.L"); 953 break; 954 case p9_proto_2000u: 955 req = p9_client_rpc(c, P9_TVERSION, "ds", 956 c->msize, "9P2000.u"); 957 break; 958 case p9_proto_legacy: 959 req = p9_client_rpc(c, P9_TVERSION, "ds", 960 c->msize, "9P2000"); 961 break; 962 default: 963 return -EINVAL; 964 } 965 966 if (IS_ERR(req)) 967 return PTR_ERR(req); 968 969 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); 970 if (err) { 971 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 972 trace_9p_protocol_dump(c, &req->rc); 973 goto error; 974 } 975 976 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 977 if (!strncmp(version, "9P2000.L", 8)) 978 c->proto_version = p9_proto_2000L; 979 else if (!strncmp(version, "9P2000.u", 8)) 980 c->proto_version = p9_proto_2000u; 981 else if (!strncmp(version, "9P2000", 6)) 982 c->proto_version = p9_proto_legacy; 983 else { 984 p9_debug(P9_DEBUG_ERROR, 985 "server returned an unknown version: %s\n", version); 986 err = -EREMOTEIO; 987 goto error; 988 } 989 990 if (msize < 4096) { 991 p9_debug(P9_DEBUG_ERROR, 992 "server returned a msize < 4096: %d\n", msize); 993 err = -EREMOTEIO; 994 goto error; 995 } 996 if (msize < c->msize) 997 c->msize = msize; 998 999 error: 1000 kfree(version); 1001 p9_tag_remove(c, req); 1002 1003 return err; 1004 } 1005 1006 struct p9_client *p9_client_create(const char *dev_name, char *options) 1007 { 1008 int err; 1009 struct p9_client *clnt; 1010 char *client_id; 1011 1012 err = 0; 1013 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 1014 if (!clnt) 1015 return ERR_PTR(-ENOMEM); 1016 1017 clnt->trans_mod = NULL; 1018 clnt->trans = NULL; 1019 clnt->fcall_cache = NULL; 1020 1021 client_id = utsname()->nodename; 1022 memcpy(clnt->name, client_id, strlen(client_id) + 1); 1023 1024 spin_lock_init(&clnt->lock); 1025 idr_init(&clnt->fids); 1026 idr_init(&clnt->reqs); 1027 1028 err = parse_opts(options, clnt); 1029 if (err < 0) 1030 goto free_client; 1031 1032 if (!clnt->trans_mod) 1033 clnt->trans_mod = v9fs_get_default_trans(); 1034 1035 if (clnt->trans_mod == NULL) { 1036 err = -EPROTONOSUPPORT; 1037 p9_debug(P9_DEBUG_ERROR, 1038 "No transport defined or default transport\n"); 1039 goto free_client; 1040 } 1041 1042 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1043 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1044 1045 err = clnt->trans_mod->create(clnt, dev_name, options); 1046 if (err) 1047 goto put_trans; 1048 1049 if (clnt->msize > clnt->trans_mod->maxsize) 1050 clnt->msize = clnt->trans_mod->maxsize; 1051 1052 if (clnt->msize < 4096) { 1053 p9_debug(P9_DEBUG_ERROR, 1054 "Please specify a msize of at least 4k\n"); 1055 err = -EINVAL; 1056 goto close_trans; 1057 } 1058 1059 err = p9_client_version(clnt); 1060 if (err) 1061 goto close_trans; 1062 1063 /* P9_HDRSZ + 4 is the smallest packet header we can have that is 1064 * followed by data accessed from userspace by read 1065 */ 1066 clnt->fcall_cache = 1067 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, 1068 0, 0, P9_HDRSZ + 4, 1069 clnt->msize - (P9_HDRSZ + 4), 1070 NULL); 1071 1072 return clnt; 1073 1074 close_trans: 1075 clnt->trans_mod->close(clnt); 1076 put_trans: 1077 v9fs_put_trans(clnt->trans_mod); 1078 free_client: 1079 kfree(clnt); 1080 return ERR_PTR(err); 1081 } 1082 EXPORT_SYMBOL(p9_client_create); 1083 1084 void p9_client_destroy(struct p9_client *clnt) 1085 { 1086 struct p9_fid *fid; 1087 int id; 1088 1089 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1090 1091 if (clnt->trans_mod) 1092 clnt->trans_mod->close(clnt); 1093 1094 v9fs_put_trans(clnt->trans_mod); 1095 1096 idr_for_each_entry(&clnt->fids, fid, id) { 1097 pr_info("Found fid %d not clunked\n", fid->fid); 1098 p9_fid_destroy(fid); 1099 } 1100 1101 p9_tag_cleanup(clnt); 1102 1103 kmem_cache_destroy(clnt->fcall_cache); 1104 kfree(clnt); 1105 } 1106 EXPORT_SYMBOL(p9_client_destroy); 1107 1108 void p9_client_disconnect(struct p9_client *clnt) 1109 { 1110 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1111 clnt->status = Disconnected; 1112 } 1113 EXPORT_SYMBOL(p9_client_disconnect); 1114 1115 void p9_client_begin_disconnect(struct p9_client *clnt) 1116 { 1117 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1118 clnt->status = BeginDisconnect; 1119 } 1120 EXPORT_SYMBOL(p9_client_begin_disconnect); 1121 1122 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1123 const char *uname, kuid_t n_uname, const char *aname) 1124 { 1125 int err = 0; 1126 struct p9_req_t *req; 1127 struct p9_fid *fid; 1128 struct p9_qid qid; 1129 1130 1131 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1132 afid ? afid->fid : -1, uname, aname); 1133 fid = p9_fid_create(clnt); 1134 if (!fid) { 1135 err = -ENOMEM; 1136 goto error; 1137 } 1138 fid->uid = n_uname; 1139 1140 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1141 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1142 if (IS_ERR(req)) { 1143 err = PTR_ERR(req); 1144 goto error; 1145 } 1146 1147 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); 1148 if (err) { 1149 trace_9p_protocol_dump(clnt, &req->rc); 1150 p9_tag_remove(clnt, req); 1151 goto error; 1152 } 1153 1154 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1155 qid.type, (unsigned long long)qid.path, qid.version); 1156 1157 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1158 1159 p9_tag_remove(clnt, req); 1160 return fid; 1161 1162 error: 1163 if (fid) 1164 p9_fid_destroy(fid); 1165 return ERR_PTR(err); 1166 } 1167 EXPORT_SYMBOL(p9_client_attach); 1168 1169 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1170 const unsigned char * const *wnames, int clone) 1171 { 1172 int err; 1173 struct p9_client *clnt; 1174 struct p9_fid *fid; 1175 struct p9_qid *wqids; 1176 struct p9_req_t *req; 1177 uint16_t nwqids, count; 1178 1179 err = 0; 1180 wqids = NULL; 1181 clnt = oldfid->clnt; 1182 if (clone) { 1183 fid = p9_fid_create(clnt); 1184 if (!fid) { 1185 err = -ENOMEM; 1186 goto error; 1187 } 1188 1189 fid->uid = oldfid->uid; 1190 } else 1191 fid = oldfid; 1192 1193 1194 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1195 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1196 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1197 nwname, wnames); 1198 if (IS_ERR(req)) { 1199 err = PTR_ERR(req); 1200 goto error; 1201 } 1202 1203 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1204 if (err) { 1205 trace_9p_protocol_dump(clnt, &req->rc); 1206 p9_tag_remove(clnt, req); 1207 goto clunk_fid; 1208 } 1209 p9_tag_remove(clnt, req); 1210 1211 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1212 1213 if (nwqids != nwname) { 1214 err = -ENOENT; 1215 goto clunk_fid; 1216 } 1217 1218 for (count = 0; count < nwqids; count++) 1219 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1220 count, wqids[count].type, 1221 (unsigned long long)wqids[count].path, 1222 wqids[count].version); 1223 1224 if (nwname) 1225 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1226 else 1227 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); 1228 1229 kfree(wqids); 1230 return fid; 1231 1232 clunk_fid: 1233 kfree(wqids); 1234 p9_client_clunk(fid); 1235 fid = NULL; 1236 1237 error: 1238 if (fid && (fid != oldfid)) 1239 p9_fid_destroy(fid); 1240 1241 return ERR_PTR(err); 1242 } 1243 EXPORT_SYMBOL(p9_client_walk); 1244 1245 int p9_client_open(struct p9_fid *fid, int mode) 1246 { 1247 int err; 1248 struct p9_client *clnt; 1249 struct p9_req_t *req; 1250 struct p9_qid qid; 1251 int iounit; 1252 1253 clnt = fid->clnt; 1254 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1255 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1256 err = 0; 1257 1258 if (fid->mode != -1) 1259 return -EINVAL; 1260 1261 if (p9_is_proto_dotl(clnt)) 1262 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1263 else 1264 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1265 if (IS_ERR(req)) { 1266 err = PTR_ERR(req); 1267 goto error; 1268 } 1269 1270 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1271 if (err) { 1272 trace_9p_protocol_dump(clnt, &req->rc); 1273 goto free_and_error; 1274 } 1275 1276 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1277 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1278 (unsigned long long)qid.path, qid.version, iounit); 1279 1280 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1281 fid->mode = mode; 1282 fid->iounit = iounit; 1283 1284 free_and_error: 1285 p9_tag_remove(clnt, req); 1286 error: 1287 return err; 1288 } 1289 EXPORT_SYMBOL(p9_client_open); 1290 1291 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode, 1292 kgid_t gid, struct p9_qid *qid) 1293 { 1294 int err = 0; 1295 struct p9_client *clnt; 1296 struct p9_req_t *req; 1297 int iounit; 1298 1299 p9_debug(P9_DEBUG_9P, 1300 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1301 ofid->fid, name, flags, mode, 1302 from_kgid(&init_user_ns, gid)); 1303 clnt = ofid->clnt; 1304 1305 if (ofid->mode != -1) 1306 return -EINVAL; 1307 1308 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1309 mode, gid); 1310 if (IS_ERR(req)) { 1311 err = PTR_ERR(req); 1312 goto error; 1313 } 1314 1315 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); 1316 if (err) { 1317 trace_9p_protocol_dump(clnt, &req->rc); 1318 goto free_and_error; 1319 } 1320 1321 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1322 qid->type, 1323 (unsigned long long)qid->path, 1324 qid->version, iounit); 1325 1326 memmove(&ofid->qid, qid, sizeof(struct p9_qid)); 1327 ofid->mode = mode; 1328 ofid->iounit = iounit; 1329 1330 free_and_error: 1331 p9_tag_remove(clnt, req); 1332 error: 1333 return err; 1334 } 1335 EXPORT_SYMBOL(p9_client_create_dotl); 1336 1337 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1338 char *extension) 1339 { 1340 int err; 1341 struct p9_client *clnt; 1342 struct p9_req_t *req; 1343 struct p9_qid qid; 1344 int iounit; 1345 1346 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1347 fid->fid, name, perm, mode); 1348 err = 0; 1349 clnt = fid->clnt; 1350 1351 if (fid->mode != -1) 1352 return -EINVAL; 1353 1354 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1355 mode, extension); 1356 if (IS_ERR(req)) { 1357 err = PTR_ERR(req); 1358 goto error; 1359 } 1360 1361 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1362 if (err) { 1363 trace_9p_protocol_dump(clnt, &req->rc); 1364 goto free_and_error; 1365 } 1366 1367 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1368 qid.type, 1369 (unsigned long long)qid.path, 1370 qid.version, iounit); 1371 1372 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1373 fid->mode = mode; 1374 fid->iounit = iounit; 1375 1376 free_and_error: 1377 p9_tag_remove(clnt, req); 1378 error: 1379 return err; 1380 } 1381 EXPORT_SYMBOL(p9_client_fcreate); 1382 1383 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1384 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1385 { 1386 int err = 0; 1387 struct p9_client *clnt; 1388 struct p9_req_t *req; 1389 1390 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1391 dfid->fid, name, symtgt); 1392 clnt = dfid->clnt; 1393 1394 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1395 gid); 1396 if (IS_ERR(req)) { 1397 err = PTR_ERR(req); 1398 goto error; 1399 } 1400 1401 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 1402 if (err) { 1403 trace_9p_protocol_dump(clnt, &req->rc); 1404 goto free_and_error; 1405 } 1406 1407 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1408 qid->type, (unsigned long long)qid->path, qid->version); 1409 1410 free_and_error: 1411 p9_tag_remove(clnt, req); 1412 error: 1413 return err; 1414 } 1415 EXPORT_SYMBOL(p9_client_symlink); 1416 1417 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1418 { 1419 struct p9_client *clnt; 1420 struct p9_req_t *req; 1421 1422 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1423 dfid->fid, oldfid->fid, newname); 1424 clnt = dfid->clnt; 1425 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1426 newname); 1427 if (IS_ERR(req)) 1428 return PTR_ERR(req); 1429 1430 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1431 p9_tag_remove(clnt, req); 1432 return 0; 1433 } 1434 EXPORT_SYMBOL(p9_client_link); 1435 1436 int p9_client_fsync(struct p9_fid *fid, int datasync) 1437 { 1438 int err; 1439 struct p9_client *clnt; 1440 struct p9_req_t *req; 1441 1442 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1443 fid->fid, datasync); 1444 err = 0; 1445 clnt = fid->clnt; 1446 1447 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1448 if (IS_ERR(req)) { 1449 err = PTR_ERR(req); 1450 goto error; 1451 } 1452 1453 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1454 1455 p9_tag_remove(clnt, req); 1456 1457 error: 1458 return err; 1459 } 1460 EXPORT_SYMBOL(p9_client_fsync); 1461 1462 int p9_client_clunk(struct p9_fid *fid) 1463 { 1464 int err; 1465 struct p9_client *clnt; 1466 struct p9_req_t *req; 1467 int retries = 0; 1468 1469 if (!fid || IS_ERR(fid)) { 1470 pr_warn("%s (%d): Trying to clunk with invalid fid\n", 1471 __func__, task_pid_nr(current)); 1472 dump_stack(); 1473 return 0; 1474 } 1475 if (!refcount_dec_and_test(&fid->count)) 1476 return 0; 1477 1478 again: 1479 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid, 1480 retries); 1481 err = 0; 1482 clnt = fid->clnt; 1483 1484 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1485 if (IS_ERR(req)) { 1486 err = PTR_ERR(req); 1487 goto error; 1488 } 1489 1490 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1491 1492 p9_tag_remove(clnt, req); 1493 error: 1494 /* 1495 * Fid is not valid even after a failed clunk 1496 * If interrupted, retry once then give up and 1497 * leak fid until umount. 1498 */ 1499 if (err == -ERESTARTSYS) { 1500 if (retries++ == 0) 1501 goto again; 1502 } else 1503 p9_fid_destroy(fid); 1504 return err; 1505 } 1506 EXPORT_SYMBOL(p9_client_clunk); 1507 1508 int p9_client_remove(struct p9_fid *fid) 1509 { 1510 int err; 1511 struct p9_client *clnt; 1512 struct p9_req_t *req; 1513 1514 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1515 err = 0; 1516 clnt = fid->clnt; 1517 1518 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1519 if (IS_ERR(req)) { 1520 err = PTR_ERR(req); 1521 goto error; 1522 } 1523 1524 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1525 1526 p9_tag_remove(clnt, req); 1527 error: 1528 if (err == -ERESTARTSYS) 1529 p9_client_clunk(fid); 1530 else 1531 p9_fid_destroy(fid); 1532 return err; 1533 } 1534 EXPORT_SYMBOL(p9_client_remove); 1535 1536 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1537 { 1538 int err = 0; 1539 struct p9_req_t *req; 1540 struct p9_client *clnt; 1541 1542 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1543 dfid->fid, name, flags); 1544 1545 clnt = dfid->clnt; 1546 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1547 if (IS_ERR(req)) { 1548 err = PTR_ERR(req); 1549 goto error; 1550 } 1551 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1552 1553 p9_tag_remove(clnt, req); 1554 error: 1555 return err; 1556 } 1557 EXPORT_SYMBOL(p9_client_unlinkat); 1558 1559 int 1560 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1561 { 1562 int total = 0; 1563 *err = 0; 1564 1565 while (iov_iter_count(to)) { 1566 int count; 1567 1568 count = p9_client_read_once(fid, offset, to, err); 1569 if (!count || *err) 1570 break; 1571 offset += count; 1572 total += count; 1573 } 1574 return total; 1575 } 1576 EXPORT_SYMBOL(p9_client_read); 1577 1578 int 1579 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, 1580 int *err) 1581 { 1582 struct p9_client *clnt = fid->clnt; 1583 struct p9_req_t *req; 1584 int count = iov_iter_count(to); 1585 int rsize, non_zc = 0; 1586 char *dataptr; 1587 1588 *err = 0; 1589 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", 1590 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to)); 1591 1592 rsize = fid->iounit; 1593 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1594 rsize = clnt->msize - P9_IOHDRSZ; 1595 1596 if (count < rsize) 1597 rsize = count; 1598 1599 /* Don't bother zerocopy for small IO (< 1024) */ 1600 if (clnt->trans_mod->zc_request && rsize > 1024) { 1601 /* response header len is 11 1602 * PDU Header(7) + IO Size (4) 1603 */ 1604 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1605 0, 11, "dqd", fid->fid, 1606 offset, rsize); 1607 } else { 1608 non_zc = 1; 1609 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1610 rsize); 1611 } 1612 if (IS_ERR(req)) { 1613 *err = PTR_ERR(req); 1614 return 0; 1615 } 1616 1617 *err = p9pdu_readf(&req->rc, clnt->proto_version, 1618 "D", &count, &dataptr); 1619 if (*err) { 1620 trace_9p_protocol_dump(clnt, &req->rc); 1621 p9_tag_remove(clnt, req); 1622 return 0; 1623 } 1624 if (rsize < count) { 1625 pr_err("bogus RREAD count (%d > %d)\n", count, rsize); 1626 count = rsize; 1627 } 1628 1629 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1630 1631 if (non_zc) { 1632 int n = copy_to_iter(dataptr, count, to); 1633 1634 if (n != count) { 1635 *err = -EFAULT; 1636 p9_tag_remove(clnt, req); 1637 return n; 1638 } 1639 } else { 1640 iov_iter_advance(to, count); 1641 } 1642 p9_tag_remove(clnt, req); 1643 return count; 1644 } 1645 EXPORT_SYMBOL(p9_client_read_once); 1646 1647 int 1648 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1649 { 1650 struct p9_client *clnt = fid->clnt; 1651 struct p9_req_t *req; 1652 int total = 0; 1653 *err = 0; 1654 1655 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", 1656 fid->fid, (unsigned long long) offset, 1657 iov_iter_count(from)); 1658 1659 while (iov_iter_count(from)) { 1660 int count = iov_iter_count(from); 1661 int rsize = fid->iounit; 1662 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1663 rsize = clnt->msize - P9_IOHDRSZ; 1664 1665 if (count < rsize) 1666 rsize = count; 1667 1668 /* Don't bother zerocopy for small IO (< 1024) */ 1669 if (clnt->trans_mod->zc_request && rsize > 1024) { 1670 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1671 rsize, P9_ZC_HDR_SZ, "dqd", 1672 fid->fid, offset, rsize); 1673 } else { 1674 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1675 offset, rsize, from); 1676 } 1677 if (IS_ERR(req)) { 1678 *err = PTR_ERR(req); 1679 break; 1680 } 1681 1682 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count); 1683 if (*err) { 1684 trace_9p_protocol_dump(clnt, &req->rc); 1685 p9_tag_remove(clnt, req); 1686 break; 1687 } 1688 if (rsize < count) { 1689 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize); 1690 count = rsize; 1691 } 1692 1693 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1694 1695 p9_tag_remove(clnt, req); 1696 iov_iter_advance(from, count); 1697 total += count; 1698 offset += count; 1699 } 1700 return total; 1701 } 1702 EXPORT_SYMBOL(p9_client_write); 1703 1704 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1705 { 1706 int err; 1707 struct p9_client *clnt; 1708 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1709 struct p9_req_t *req; 1710 u16 ignored; 1711 1712 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1713 1714 if (!ret) 1715 return ERR_PTR(-ENOMEM); 1716 1717 err = 0; 1718 clnt = fid->clnt; 1719 1720 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1721 if (IS_ERR(req)) { 1722 err = PTR_ERR(req); 1723 goto error; 1724 } 1725 1726 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); 1727 if (err) { 1728 trace_9p_protocol_dump(clnt, &req->rc); 1729 p9_tag_remove(clnt, req); 1730 goto error; 1731 } 1732 1733 p9_debug(P9_DEBUG_9P, 1734 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1735 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1736 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1737 "<<< uid=%d gid=%d n_muid=%d\n", 1738 ret->size, ret->type, ret->dev, ret->qid.type, 1739 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1740 ret->atime, ret->mtime, (unsigned long long)ret->length, 1741 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1742 from_kuid(&init_user_ns, ret->n_uid), 1743 from_kgid(&init_user_ns, ret->n_gid), 1744 from_kuid(&init_user_ns, ret->n_muid)); 1745 1746 p9_tag_remove(clnt, req); 1747 return ret; 1748 1749 error: 1750 kfree(ret); 1751 return ERR_PTR(err); 1752 } 1753 EXPORT_SYMBOL(p9_client_stat); 1754 1755 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1756 u64 request_mask) 1757 { 1758 int err; 1759 struct p9_client *clnt; 1760 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1761 GFP_KERNEL); 1762 struct p9_req_t *req; 1763 1764 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1765 fid->fid, request_mask); 1766 1767 if (!ret) 1768 return ERR_PTR(-ENOMEM); 1769 1770 err = 0; 1771 clnt = fid->clnt; 1772 1773 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1774 if (IS_ERR(req)) { 1775 err = PTR_ERR(req); 1776 goto error; 1777 } 1778 1779 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); 1780 if (err) { 1781 trace_9p_protocol_dump(clnt, &req->rc); 1782 p9_tag_remove(clnt, req); 1783 goto error; 1784 } 1785 1786 p9_debug(P9_DEBUG_9P, 1787 "<<< RGETATTR st_result_mask=%lld\n" 1788 "<<< qid=%x.%llx.%x\n" 1789 "<<< st_mode=%8.8x st_nlink=%llu\n" 1790 "<<< st_uid=%d st_gid=%d\n" 1791 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1792 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1793 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1794 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1795 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1796 "<<< st_gen=%lld st_data_version=%lld\n", 1797 ret->st_result_mask, ret->qid.type, ret->qid.path, 1798 ret->qid.version, ret->st_mode, ret->st_nlink, 1799 from_kuid(&init_user_ns, ret->st_uid), 1800 from_kgid(&init_user_ns, ret->st_gid), 1801 ret->st_rdev, ret->st_size, ret->st_blksize, 1802 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1803 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1804 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1805 ret->st_gen, ret->st_data_version); 1806 1807 p9_tag_remove(clnt, req); 1808 return ret; 1809 1810 error: 1811 kfree(ret); 1812 return ERR_PTR(err); 1813 } 1814 EXPORT_SYMBOL(p9_client_getattr_dotl); 1815 1816 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1817 { 1818 int ret; 1819 1820 /* NOTE: size shouldn't include its own length */ 1821 /* size[2] type[2] dev[4] qid[13] */ 1822 /* mode[4] atime[4] mtime[4] length[8]*/ 1823 /* name[s] uid[s] gid[s] muid[s] */ 1824 ret = 2+4+13+4+4+4+8+2+2+2+2; 1825 1826 if (wst->name) 1827 ret += strlen(wst->name); 1828 if (wst->uid) 1829 ret += strlen(wst->uid); 1830 if (wst->gid) 1831 ret += strlen(wst->gid); 1832 if (wst->muid) 1833 ret += strlen(wst->muid); 1834 1835 if ((proto_version == p9_proto_2000u) || 1836 (proto_version == p9_proto_2000L)) { 1837 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1838 if (wst->extension) 1839 ret += strlen(wst->extension); 1840 } 1841 1842 return ret; 1843 } 1844 1845 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1846 { 1847 int err; 1848 struct p9_req_t *req; 1849 struct p9_client *clnt; 1850 1851 err = 0; 1852 clnt = fid->clnt; 1853 wst->size = p9_client_statsize(wst, clnt->proto_version); 1854 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1855 p9_debug(P9_DEBUG_9P, 1856 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1857 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1858 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1859 " uid=%d gid=%d n_muid=%d\n", 1860 wst->size, wst->type, wst->dev, wst->qid.type, 1861 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1862 wst->atime, wst->mtime, (unsigned long long)wst->length, 1863 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1864 from_kuid(&init_user_ns, wst->n_uid), 1865 from_kgid(&init_user_ns, wst->n_gid), 1866 from_kuid(&init_user_ns, wst->n_muid)); 1867 1868 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1869 if (IS_ERR(req)) { 1870 err = PTR_ERR(req); 1871 goto error; 1872 } 1873 1874 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1875 1876 p9_tag_remove(clnt, req); 1877 error: 1878 return err; 1879 } 1880 EXPORT_SYMBOL(p9_client_wstat); 1881 1882 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1883 { 1884 int err; 1885 struct p9_req_t *req; 1886 struct p9_client *clnt; 1887 1888 err = 0; 1889 clnt = fid->clnt; 1890 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1891 p9_debug(P9_DEBUG_9P, 1892 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1893 " atime_sec=%lld atime_nsec=%lld\n" 1894 " mtime_sec=%lld mtime_nsec=%lld\n", 1895 p9attr->valid, p9attr->mode, 1896 from_kuid(&init_user_ns, p9attr->uid), 1897 from_kgid(&init_user_ns, p9attr->gid), 1898 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1899 p9attr->mtime_sec, p9attr->mtime_nsec); 1900 1901 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1902 1903 if (IS_ERR(req)) { 1904 err = PTR_ERR(req); 1905 goto error; 1906 } 1907 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1908 p9_tag_remove(clnt, req); 1909 error: 1910 return err; 1911 } 1912 EXPORT_SYMBOL(p9_client_setattr); 1913 1914 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1915 { 1916 int err; 1917 struct p9_req_t *req; 1918 struct p9_client *clnt; 1919 1920 err = 0; 1921 clnt = fid->clnt; 1922 1923 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1924 1925 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1926 if (IS_ERR(req)) { 1927 err = PTR_ERR(req); 1928 goto error; 1929 } 1930 1931 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1932 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1933 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1934 if (err) { 1935 trace_9p_protocol_dump(clnt, &req->rc); 1936 p9_tag_remove(clnt, req); 1937 goto error; 1938 } 1939 1940 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1941 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1942 "fsid %llu namelen %ld\n", 1943 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1944 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1945 sb->fsid, (long int)sb->namelen); 1946 1947 p9_tag_remove(clnt, req); 1948 error: 1949 return err; 1950 } 1951 EXPORT_SYMBOL(p9_client_statfs); 1952 1953 int p9_client_rename(struct p9_fid *fid, 1954 struct p9_fid *newdirfid, const char *name) 1955 { 1956 int err; 1957 struct p9_req_t *req; 1958 struct p9_client *clnt; 1959 1960 err = 0; 1961 clnt = fid->clnt; 1962 1963 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1964 fid->fid, newdirfid->fid, name); 1965 1966 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1967 newdirfid->fid, name); 1968 if (IS_ERR(req)) { 1969 err = PTR_ERR(req); 1970 goto error; 1971 } 1972 1973 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1974 1975 p9_tag_remove(clnt, req); 1976 error: 1977 return err; 1978 } 1979 EXPORT_SYMBOL(p9_client_rename); 1980 1981 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1982 struct p9_fid *newdirfid, const char *new_name) 1983 { 1984 int err; 1985 struct p9_req_t *req; 1986 struct p9_client *clnt; 1987 1988 err = 0; 1989 clnt = olddirfid->clnt; 1990 1991 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" 1992 " newdirfid %d new name %s\n", olddirfid->fid, old_name, 1993 newdirfid->fid, new_name); 1994 1995 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1996 old_name, newdirfid->fid, new_name); 1997 if (IS_ERR(req)) { 1998 err = PTR_ERR(req); 1999 goto error; 2000 } 2001 2002 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 2003 newdirfid->fid, new_name); 2004 2005 p9_tag_remove(clnt, req); 2006 error: 2007 return err; 2008 } 2009 EXPORT_SYMBOL(p9_client_renameat); 2010 2011 /* 2012 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 2013 */ 2014 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 2015 const char *attr_name, u64 *attr_size) 2016 { 2017 int err; 2018 struct p9_req_t *req; 2019 struct p9_client *clnt; 2020 struct p9_fid *attr_fid; 2021 2022 err = 0; 2023 clnt = file_fid->clnt; 2024 attr_fid = p9_fid_create(clnt); 2025 if (!attr_fid) { 2026 err = -ENOMEM; 2027 goto error; 2028 } 2029 p9_debug(P9_DEBUG_9P, 2030 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 2031 file_fid->fid, attr_fid->fid, attr_name); 2032 2033 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 2034 file_fid->fid, attr_fid->fid, attr_name); 2035 if (IS_ERR(req)) { 2036 err = PTR_ERR(req); 2037 goto error; 2038 } 2039 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); 2040 if (err) { 2041 trace_9p_protocol_dump(clnt, &req->rc); 2042 p9_tag_remove(clnt, req); 2043 goto clunk_fid; 2044 } 2045 p9_tag_remove(clnt, req); 2046 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2047 attr_fid->fid, *attr_size); 2048 return attr_fid; 2049 clunk_fid: 2050 p9_client_clunk(attr_fid); 2051 attr_fid = NULL; 2052 error: 2053 if (attr_fid && (attr_fid != file_fid)) 2054 p9_fid_destroy(attr_fid); 2055 2056 return ERR_PTR(err); 2057 } 2058 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2059 2060 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2061 u64 attr_size, int flags) 2062 { 2063 int err; 2064 struct p9_req_t *req; 2065 struct p9_client *clnt; 2066 2067 p9_debug(P9_DEBUG_9P, 2068 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 2069 fid->fid, name, (long long)attr_size, flags); 2070 err = 0; 2071 clnt = fid->clnt; 2072 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2073 fid->fid, name, attr_size, flags); 2074 if (IS_ERR(req)) { 2075 err = PTR_ERR(req); 2076 goto error; 2077 } 2078 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2079 p9_tag_remove(clnt, req); 2080 error: 2081 return err; 2082 } 2083 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2084 2085 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2086 { 2087 int err, rsize, non_zc = 0; 2088 struct p9_client *clnt; 2089 struct p9_req_t *req; 2090 char *dataptr; 2091 struct kvec kv = {.iov_base = data, .iov_len = count}; 2092 struct iov_iter to; 2093 2094 iov_iter_kvec(&to, READ, &kv, 1, count); 2095 2096 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2097 fid->fid, (unsigned long long) offset, count); 2098 2099 err = 0; 2100 clnt = fid->clnt; 2101 2102 rsize = fid->iounit; 2103 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 2104 rsize = clnt->msize - P9_READDIRHDRSZ; 2105 2106 if (count < rsize) 2107 rsize = count; 2108 2109 /* Don't bother zerocopy for small IO (< 1024) */ 2110 if (clnt->trans_mod->zc_request && rsize > 1024) { 2111 /* 2112 * response header len is 11 2113 * PDU Header(7) + IO Size (4) 2114 */ 2115 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2116 11, "dqd", fid->fid, offset, rsize); 2117 } else { 2118 non_zc = 1; 2119 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2120 offset, rsize); 2121 } 2122 if (IS_ERR(req)) { 2123 err = PTR_ERR(req); 2124 goto error; 2125 } 2126 2127 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); 2128 if (err) { 2129 trace_9p_protocol_dump(clnt, &req->rc); 2130 goto free_and_error; 2131 } 2132 if (rsize < count) { 2133 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2134 count = rsize; 2135 } 2136 2137 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2138 2139 if (non_zc) 2140 memmove(data, dataptr, count); 2141 2142 p9_tag_remove(clnt, req); 2143 return count; 2144 2145 free_and_error: 2146 p9_tag_remove(clnt, req); 2147 error: 2148 return err; 2149 } 2150 EXPORT_SYMBOL(p9_client_readdir); 2151 2152 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2153 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2154 { 2155 int err; 2156 struct p9_client *clnt; 2157 struct p9_req_t *req; 2158 2159 err = 0; 2160 clnt = fid->clnt; 2161 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 2162 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2163 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2164 MAJOR(rdev), MINOR(rdev), gid); 2165 if (IS_ERR(req)) 2166 return PTR_ERR(req); 2167 2168 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2169 if (err) { 2170 trace_9p_protocol_dump(clnt, &req->rc); 2171 goto error; 2172 } 2173 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 2174 (unsigned long long)qid->path, qid->version); 2175 2176 error: 2177 p9_tag_remove(clnt, req); 2178 return err; 2179 2180 } 2181 EXPORT_SYMBOL(p9_client_mknod_dotl); 2182 2183 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2184 kgid_t gid, struct p9_qid *qid) 2185 { 2186 int err; 2187 struct p9_client *clnt; 2188 struct p9_req_t *req; 2189 2190 err = 0; 2191 clnt = fid->clnt; 2192 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2193 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2194 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode, 2195 gid); 2196 if (IS_ERR(req)) 2197 return PTR_ERR(req); 2198 2199 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2200 if (err) { 2201 trace_9p_protocol_dump(clnt, &req->rc); 2202 goto error; 2203 } 2204 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2205 (unsigned long long)qid->path, qid->version); 2206 2207 error: 2208 p9_tag_remove(clnt, req); 2209 return err; 2210 2211 } 2212 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2213 2214 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2215 { 2216 int err; 2217 struct p9_client *clnt; 2218 struct p9_req_t *req; 2219 2220 err = 0; 2221 clnt = fid->clnt; 2222 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " 2223 "start %lld length %lld proc_id %d client_id %s\n", 2224 fid->fid, flock->type, flock->flags, flock->start, 2225 flock->length, flock->proc_id, flock->client_id); 2226 2227 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2228 flock->flags, flock->start, flock->length, 2229 flock->proc_id, flock->client_id); 2230 2231 if (IS_ERR(req)) 2232 return PTR_ERR(req); 2233 2234 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); 2235 if (err) { 2236 trace_9p_protocol_dump(clnt, &req->rc); 2237 goto error; 2238 } 2239 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2240 error: 2241 p9_tag_remove(clnt, req); 2242 return err; 2243 2244 } 2245 EXPORT_SYMBOL(p9_client_lock_dotl); 2246 2247 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2248 { 2249 int err; 2250 struct p9_client *clnt; 2251 struct p9_req_t *req; 2252 2253 err = 0; 2254 clnt = fid->clnt; 2255 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " 2256 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, 2257 glock->start, glock->length, glock->proc_id, glock->client_id); 2258 2259 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, 2260 glock->start, glock->length, glock->proc_id, glock->client_id); 2261 2262 if (IS_ERR(req)) 2263 return PTR_ERR(req); 2264 2265 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, 2266 &glock->start, &glock->length, &glock->proc_id, 2267 &glock->client_id); 2268 if (err) { 2269 trace_9p_protocol_dump(clnt, &req->rc); 2270 goto error; 2271 } 2272 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " 2273 "proc_id %d client_id %s\n", glock->type, glock->start, 2274 glock->length, glock->proc_id, glock->client_id); 2275 error: 2276 p9_tag_remove(clnt, req); 2277 return err; 2278 } 2279 EXPORT_SYMBOL(p9_client_getlock_dotl); 2280 2281 int p9_client_readlink(struct p9_fid *fid, char **target) 2282 { 2283 int err; 2284 struct p9_client *clnt; 2285 struct p9_req_t *req; 2286 2287 err = 0; 2288 clnt = fid->clnt; 2289 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2290 2291 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2292 if (IS_ERR(req)) 2293 return PTR_ERR(req); 2294 2295 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); 2296 if (err) { 2297 trace_9p_protocol_dump(clnt, &req->rc); 2298 goto error; 2299 } 2300 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2301 error: 2302 p9_tag_remove(clnt, req); 2303 return err; 2304 } 2305 EXPORT_SYMBOL(p9_client_readlink); 2306 2307 int __init p9_client_init(void) 2308 { 2309 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); 2310 return p9_req_cache ? 0 : -ENOMEM; 2311 } 2312 2313 void __exit p9_client_exit(void) 2314 { 2315 kmem_cache_destroy(p9_req_cache); 2316 } 2317