1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * 9P Client 4 * 5 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> 6 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net> 7 */ 8 9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 10 11 #include <linux/module.h> 12 #include <linux/errno.h> 13 #include <linux/fs.h> 14 #include <linux/poll.h> 15 #include <linux/idr.h> 16 #include <linux/mutex.h> 17 #include <linux/slab.h> 18 #include <linux/sched/signal.h> 19 #include <linux/uaccess.h> 20 #include <linux/uio.h> 21 #include <net/9p/9p.h> 22 #include <linux/parser.h> 23 #include <linux/seq_file.h> 24 #include <net/9p/client.h> 25 #include <net/9p/transport.h> 26 #include "protocol.h" 27 28 #define CREATE_TRACE_POINTS 29 #include <trace/events/9p.h> 30 31 #define DEFAULT_MSIZE (128 * 1024) 32 33 /* Client Option Parsing (code inspired by NFS code) 34 * - a little lazy - parse all client options 35 */ 36 37 enum { 38 Opt_msize, 39 Opt_trans, 40 Opt_legacy, 41 Opt_version, 42 Opt_err, 43 }; 44 45 static const match_table_t tokens = { 46 {Opt_msize, "msize=%u"}, 47 {Opt_legacy, "noextend"}, 48 {Opt_trans, "trans=%s"}, 49 {Opt_version, "version=%s"}, 50 {Opt_err, NULL}, 51 }; 52 53 inline int p9_is_proto_dotl(struct p9_client *clnt) 54 { 55 return clnt->proto_version == p9_proto_2000L; 56 } 57 EXPORT_SYMBOL(p9_is_proto_dotl); 58 59 inline int p9_is_proto_dotu(struct p9_client *clnt) 60 { 61 return clnt->proto_version == p9_proto_2000u; 62 } 63 EXPORT_SYMBOL(p9_is_proto_dotu); 64 65 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt) 66 { 67 if (clnt->msize != DEFAULT_MSIZE) 68 seq_printf(m, ",msize=%u", clnt->msize); 69 seq_printf(m, ",trans=%s", clnt->trans_mod->name); 70 71 switch (clnt->proto_version) { 72 case p9_proto_legacy: 73 seq_puts(m, ",noextend"); 74 break; 75 case p9_proto_2000u: 76 seq_puts(m, ",version=9p2000.u"); 77 break; 78 case p9_proto_2000L: 79 /* Default */ 80 break; 81 } 82 83 if (clnt->trans_mod->show_options) 84 return clnt->trans_mod->show_options(m, clnt); 85 return 0; 86 } 87 EXPORT_SYMBOL(p9_show_client_options); 88 89 /* Some error codes are taken directly from the server replies, 90 * make sure they are valid. 91 */ 92 static int safe_errno(int err) 93 { 94 if (err > 0 || err < -MAX_ERRNO) { 95 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err); 96 return -EPROTO; 97 } 98 return err; 99 } 100 101 /* Interpret mount option for protocol version */ 102 static int get_protocol_version(char *s) 103 { 104 int version = -EINVAL; 105 106 if (!strcmp(s, "9p2000")) { 107 version = p9_proto_legacy; 108 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n"); 109 } else if (!strcmp(s, "9p2000.u")) { 110 version = p9_proto_2000u; 111 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); 112 } else if (!strcmp(s, "9p2000.L")) { 113 version = p9_proto_2000L; 114 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); 115 } else { 116 pr_info("Unknown protocol version %s\n", s); 117 } 118 119 return version; 120 } 121 122 /** 123 * parse_opts - parse mount options into client structure 124 * @opts: options string passed from mount 125 * @clnt: existing v9fs client information 126 * 127 * Return 0 upon success, -ERRNO upon failure 128 */ 129 130 static int parse_opts(char *opts, struct p9_client *clnt) 131 { 132 char *options, *tmp_options; 133 char *p; 134 substring_t args[MAX_OPT_ARGS]; 135 int option; 136 char *s; 137 int ret = 0; 138 139 clnt->proto_version = p9_proto_2000L; 140 clnt->msize = DEFAULT_MSIZE; 141 142 if (!opts) 143 return 0; 144 145 tmp_options = kstrdup(opts, GFP_KERNEL); 146 if (!tmp_options) 147 return -ENOMEM; 148 options = tmp_options; 149 150 while ((p = strsep(&options, ",")) != NULL) { 151 int token, r; 152 153 if (!*p) 154 continue; 155 token = match_token(p, tokens, args); 156 switch (token) { 157 case Opt_msize: 158 r = match_int(&args[0], &option); 159 if (r < 0) { 160 p9_debug(P9_DEBUG_ERROR, 161 "integer field, but no integer?\n"); 162 ret = r; 163 continue; 164 } 165 if (option < 4096) { 166 p9_debug(P9_DEBUG_ERROR, 167 "msize should be at least 4k\n"); 168 ret = -EINVAL; 169 continue; 170 } 171 clnt->msize = option; 172 break; 173 case Opt_trans: 174 s = match_strdup(&args[0]); 175 if (!s) { 176 ret = -ENOMEM; 177 p9_debug(P9_DEBUG_ERROR, 178 "problem allocating copy of trans arg\n"); 179 goto free_and_return; 180 } 181 182 v9fs_put_trans(clnt->trans_mod); 183 clnt->trans_mod = v9fs_get_trans_by_name(s); 184 if (!clnt->trans_mod) { 185 pr_info("Could not find request transport: %s\n", 186 s); 187 ret = -EINVAL; 188 } 189 kfree(s); 190 break; 191 case Opt_legacy: 192 clnt->proto_version = p9_proto_legacy; 193 break; 194 case Opt_version: 195 s = match_strdup(&args[0]); 196 if (!s) { 197 ret = -ENOMEM; 198 p9_debug(P9_DEBUG_ERROR, 199 "problem allocating copy of version arg\n"); 200 goto free_and_return; 201 } 202 r = get_protocol_version(s); 203 if (r < 0) 204 ret = r; 205 else 206 clnt->proto_version = r; 207 kfree(s); 208 break; 209 default: 210 continue; 211 } 212 } 213 214 free_and_return: 215 if (ret) 216 v9fs_put_trans(clnt->trans_mod); 217 kfree(tmp_options); 218 return ret; 219 } 220 221 static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc, 222 int alloc_msize) 223 { 224 if (likely(c->fcall_cache) && alloc_msize == c->msize) { 225 fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS); 226 fc->cache = c->fcall_cache; 227 } else { 228 fc->sdata = kmalloc(alloc_msize, GFP_NOFS); 229 fc->cache = NULL; 230 } 231 if (!fc->sdata) 232 return -ENOMEM; 233 fc->capacity = alloc_msize; 234 return 0; 235 } 236 237 void p9_fcall_fini(struct p9_fcall *fc) 238 { 239 /* sdata can be NULL for interrupted requests in trans_rdma, 240 * and kmem_cache_free does not do NULL-check for us 241 */ 242 if (unlikely(!fc->sdata)) 243 return; 244 245 if (fc->cache) 246 kmem_cache_free(fc->cache, fc->sdata); 247 else 248 kfree(fc->sdata); 249 } 250 EXPORT_SYMBOL(p9_fcall_fini); 251 252 static struct kmem_cache *p9_req_cache; 253 254 /** 255 * p9_tag_alloc - Allocate a new request. 256 * @c: Client session. 257 * @type: Transaction type. 258 * @max_size: Maximum packet size for this request. 259 * 260 * Context: Process context. 261 * Return: Pointer to new request. 262 */ 263 static struct p9_req_t * 264 p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size) 265 { 266 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); 267 int alloc_msize = min(c->msize, max_size); 268 int tag; 269 270 if (!req) 271 return ERR_PTR(-ENOMEM); 272 273 if (p9_fcall_init(c, &req->tc, alloc_msize)) 274 goto free_req; 275 if (p9_fcall_init(c, &req->rc, alloc_msize)) 276 goto free; 277 278 p9pdu_reset(&req->tc); 279 p9pdu_reset(&req->rc); 280 req->t_err = 0; 281 req->status = REQ_STATUS_ALLOC; 282 init_waitqueue_head(&req->wq); 283 INIT_LIST_HEAD(&req->req_list); 284 285 idr_preload(GFP_NOFS); 286 spin_lock_irq(&c->lock); 287 if (type == P9_TVERSION) 288 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1, 289 GFP_NOWAIT); 290 else 291 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT); 292 req->tc.tag = tag; 293 spin_unlock_irq(&c->lock); 294 idr_preload_end(); 295 if (tag < 0) 296 goto free; 297 298 /* Init ref to two because in the general case there is one ref 299 * that is put asynchronously by a writer thread, one ref 300 * temporarily given by p9_tag_lookup and put by p9_client_cb 301 * in the recv thread, and one ref put by p9_tag_remove in the 302 * main thread. The only exception is virtio that does not use 303 * p9_tag_lookup but does not have a writer thread either 304 * (the write happens synchronously in the request/zc_request 305 * callback), so p9_client_cb eats the second ref there 306 * as the pointer is duplicated directly by virtqueue_add_sgs() 307 */ 308 refcount_set(&req->refcount, 2); 309 310 return req; 311 312 free: 313 p9_fcall_fini(&req->tc); 314 p9_fcall_fini(&req->rc); 315 free_req: 316 kmem_cache_free(p9_req_cache, req); 317 return ERR_PTR(-ENOMEM); 318 } 319 320 /** 321 * p9_tag_lookup - Look up a request by tag. 322 * @c: Client session. 323 * @tag: Transaction ID. 324 * 325 * Context: Any context. 326 * Return: A request, or %NULL if there is no request with that tag. 327 */ 328 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 329 { 330 struct p9_req_t *req; 331 332 rcu_read_lock(); 333 again: 334 req = idr_find(&c->reqs, tag); 335 if (req) { 336 /* We have to be careful with the req found under rcu_read_lock 337 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the 338 * ref again without corrupting other data, then check again 339 * that the tag matches once we have the ref 340 */ 341 if (!p9_req_try_get(req)) 342 goto again; 343 if (req->tc.tag != tag) { 344 p9_req_put(c, req); 345 goto again; 346 } 347 } 348 rcu_read_unlock(); 349 350 return req; 351 } 352 EXPORT_SYMBOL(p9_tag_lookup); 353 354 /** 355 * p9_tag_remove - Remove a tag. 356 * @c: Client session. 357 * @r: Request of reference. 358 * 359 * Context: Any context. 360 */ 361 static int p9_tag_remove(struct p9_client *c, struct p9_req_t *r) 362 { 363 unsigned long flags; 364 u16 tag = r->tc.tag; 365 366 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); 367 spin_lock_irqsave(&c->lock, flags); 368 idr_remove(&c->reqs, tag); 369 spin_unlock_irqrestore(&c->lock, flags); 370 return p9_req_put(c, r); 371 } 372 373 int p9_req_put(struct p9_client *c, struct p9_req_t *r) 374 { 375 if (refcount_dec_and_test(&r->refcount)) { 376 p9_fcall_fini(&r->tc); 377 p9_fcall_fini(&r->rc); 378 kmem_cache_free(p9_req_cache, r); 379 return 1; 380 } 381 return 0; 382 } 383 EXPORT_SYMBOL(p9_req_put); 384 385 /** 386 * p9_tag_cleanup - cleans up tags structure and reclaims resources 387 * @c: v9fs client struct 388 * 389 * This frees resources associated with the tags structure 390 * 391 */ 392 static void p9_tag_cleanup(struct p9_client *c) 393 { 394 struct p9_req_t *req; 395 int id; 396 397 rcu_read_lock(); 398 idr_for_each_entry(&c->reqs, req, id) { 399 pr_info("Tag %d still in use\n", id); 400 if (p9_tag_remove(c, req) == 0) 401 pr_warn("Packet with tag %d has still references", 402 req->tc.tag); 403 } 404 rcu_read_unlock(); 405 } 406 407 /** 408 * p9_client_cb - call back from transport to client 409 * @c: client state 410 * @req: request received 411 * @status: request status, one of REQ_STATUS_* 412 * 413 */ 414 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) 415 { 416 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); 417 418 /* This barrier is needed to make sure any change made to req before 419 * the status change is visible to another thread 420 */ 421 smp_wmb(); 422 req->status = status; 423 424 wake_up(&req->wq); 425 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); 426 p9_req_put(c, req); 427 } 428 EXPORT_SYMBOL(p9_client_cb); 429 430 /** 431 * p9_parse_header - parse header arguments out of a packet 432 * @pdu: packet to parse 433 * @size: size of packet 434 * @type: type of request 435 * @tag: tag of packet 436 * @rewind: set if we need to rewind offset afterwards 437 */ 438 439 int 440 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, 441 int16_t *tag, int rewind) 442 { 443 s8 r_type; 444 s16 r_tag; 445 s32 r_size; 446 int offset = pdu->offset; 447 int err; 448 449 pdu->offset = 0; 450 451 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 452 if (err) 453 goto rewind_and_exit; 454 455 if (type) 456 *type = r_type; 457 if (tag) 458 *tag = r_tag; 459 if (size) 460 *size = r_size; 461 462 if (pdu->size != r_size || r_size < 7) { 463 err = -EINVAL; 464 goto rewind_and_exit; 465 } 466 467 pdu->id = r_type; 468 pdu->tag = r_tag; 469 470 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 471 pdu->size, pdu->id, pdu->tag); 472 473 rewind_and_exit: 474 if (rewind) 475 pdu->offset = offset; 476 return err; 477 } 478 EXPORT_SYMBOL(p9_parse_header); 479 480 /** 481 * p9_check_errors - check 9p packet for error return and process it 482 * @c: current client instance 483 * @req: request to parse and check for error conditions 484 * 485 * returns error code if one is discovered, otherwise returns 0 486 * 487 * this will have to be more complicated if we have multiple 488 * error packet types 489 */ 490 491 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 492 { 493 s8 type; 494 int err; 495 int ecode; 496 497 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 498 if (req->rc.size >= c->msize) { 499 p9_debug(P9_DEBUG_ERROR, 500 "requested packet size too big: %d\n", 501 req->rc.size); 502 return -EIO; 503 } 504 /* dump the response from server 505 * This should be after check errors which poplulate pdu_fcall. 506 */ 507 trace_9p_protocol_dump(c, &req->rc); 508 if (err) { 509 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 510 return err; 511 } 512 if (type != P9_RERROR && type != P9_RLERROR) 513 return 0; 514 515 if (!p9_is_proto_dotl(c)) { 516 char *ename; 517 518 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 519 &ename, &ecode); 520 if (err) 521 goto out_err; 522 523 if (p9_is_proto_dotu(c) && ecode < 512) 524 err = -ecode; 525 526 if (!err) { 527 err = p9_errstr2errno(ename, strlen(ename)); 528 529 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 530 -ecode, ename); 531 } 532 kfree(ename); 533 } else { 534 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 535 if (err) 536 goto out_err; 537 err = -ecode; 538 539 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 540 } 541 542 return err; 543 544 out_err: 545 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 546 547 return err; 548 } 549 550 /** 551 * p9_check_zc_errors - check 9p packet for error return and process it 552 * @c: current client instance 553 * @req: request to parse and check for error conditions 554 * @uidata: external buffer containing error 555 * @in_hdrlen: Size of response protocol buffer. 556 * 557 * returns error code if one is discovered, otherwise returns 0 558 * 559 * this will have to be more complicated if we have multiple 560 * error packet types 561 */ 562 563 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req, 564 struct iov_iter *uidata, int in_hdrlen) 565 { 566 int err; 567 int ecode; 568 s8 type; 569 char *ename = NULL; 570 571 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 572 /* dump the response from server 573 * This should be after parse_header which poplulate pdu_fcall. 574 */ 575 trace_9p_protocol_dump(c, &req->rc); 576 if (err) { 577 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 578 return err; 579 } 580 581 if (type != P9_RERROR && type != P9_RLERROR) 582 return 0; 583 584 if (!p9_is_proto_dotl(c)) { 585 /* Error is reported in string format */ 586 int len; 587 /* 7 = header size for RERROR; */ 588 int inline_len = in_hdrlen - 7; 589 590 len = req->rc.size - req->rc.offset; 591 if (len > (P9_ZC_HDR_SZ - 7)) { 592 err = -EFAULT; 593 goto out_err; 594 } 595 596 ename = &req->rc.sdata[req->rc.offset]; 597 if (len > inline_len) { 598 /* We have error in external buffer */ 599 if (!copy_from_iter_full(ename + inline_len, 600 len - inline_len, uidata)) { 601 err = -EFAULT; 602 goto out_err; 603 } 604 } 605 ename = NULL; 606 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 607 &ename, &ecode); 608 if (err) 609 goto out_err; 610 611 if (p9_is_proto_dotu(c) && ecode < 512) 612 err = -ecode; 613 614 if (!err) { 615 err = p9_errstr2errno(ename, strlen(ename)); 616 617 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 618 -ecode, ename); 619 } 620 kfree(ename); 621 } else { 622 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 623 err = -ecode; 624 625 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 626 } 627 return err; 628 629 out_err: 630 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 631 return err; 632 } 633 634 static struct p9_req_t * 635 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 636 637 /** 638 * p9_client_flush - flush (cancel) a request 639 * @c: client state 640 * @oldreq: request to cancel 641 * 642 * This sents a flush for a particular request and links 643 * the flush request to the original request. The current 644 * code only supports a single flush request although the protocol 645 * allows for multiple flush requests to be sent for a single request. 646 * 647 */ 648 649 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 650 { 651 struct p9_req_t *req; 652 s16 oldtag; 653 int err; 654 655 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); 656 if (err) 657 return err; 658 659 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 660 661 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 662 if (IS_ERR(req)) 663 return PTR_ERR(req); 664 665 /* if we haven't received a response for oldreq, 666 * remove it from the list 667 */ 668 if (oldreq->status == REQ_STATUS_SENT) { 669 if (c->trans_mod->cancelled) 670 c->trans_mod->cancelled(c, oldreq); 671 } 672 673 p9_tag_remove(c, req); 674 return 0; 675 } 676 677 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 678 int8_t type, int req_size, 679 const char *fmt, va_list ap) 680 { 681 int err; 682 struct p9_req_t *req; 683 684 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 685 686 /* we allow for any status other than disconnected */ 687 if (c->status == Disconnected) 688 return ERR_PTR(-EIO); 689 690 /* if status is begin_disconnected we allow only clunk request */ 691 if (c->status == BeginDisconnect && type != P9_TCLUNK) 692 return ERR_PTR(-EIO); 693 694 req = p9_tag_alloc(c, type, req_size); 695 if (IS_ERR(req)) 696 return req; 697 698 /* marshall the data */ 699 p9pdu_prepare(&req->tc, req->tc.tag, type); 700 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); 701 if (err) 702 goto reterr; 703 p9pdu_finalize(c, &req->tc); 704 trace_9p_client_req(c, type, req->tc.tag); 705 return req; 706 reterr: 707 p9_tag_remove(c, req); 708 /* We have to put also the 2nd reference as it won't be used */ 709 p9_req_put(c, req); 710 return ERR_PTR(err); 711 } 712 713 /** 714 * p9_client_rpc - issue a request and wait for a response 715 * @c: client session 716 * @type: type of request 717 * @fmt: protocol format string (see protocol.c) 718 * 719 * Returns request structure (which client must free using p9_tag_remove) 720 */ 721 722 static struct p9_req_t * 723 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 724 { 725 va_list ap; 726 int sigpending, err; 727 unsigned long flags; 728 struct p9_req_t *req; 729 730 va_start(ap, fmt); 731 req = p9_client_prepare_req(c, type, c->msize, fmt, ap); 732 va_end(ap); 733 if (IS_ERR(req)) 734 return req; 735 736 if (signal_pending(current)) { 737 sigpending = 1; 738 clear_thread_flag(TIF_SIGPENDING); 739 } else { 740 sigpending = 0; 741 } 742 743 err = c->trans_mod->request(c, req); 744 if (err < 0) { 745 /* write won't happen */ 746 p9_req_put(c, req); 747 if (err != -ERESTARTSYS && err != -EFAULT) 748 c->status = Disconnected; 749 goto recalc_sigpending; 750 } 751 again: 752 /* Wait for the response */ 753 err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD); 754 755 /* Make sure our req is coherent with regard to updates in other 756 * threads - echoes to wmb() in the callback 757 */ 758 smp_rmb(); 759 760 if (err == -ERESTARTSYS && c->status == Connected && 761 type == P9_TFLUSH) { 762 sigpending = 1; 763 clear_thread_flag(TIF_SIGPENDING); 764 goto again; 765 } 766 767 if (req->status == REQ_STATUS_ERROR) { 768 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 769 err = req->t_err; 770 } 771 if (err == -ERESTARTSYS && c->status == Connected) { 772 p9_debug(P9_DEBUG_MUX, "flushing\n"); 773 sigpending = 1; 774 clear_thread_flag(TIF_SIGPENDING); 775 776 if (c->trans_mod->cancel(c, req)) 777 p9_client_flush(c, req); 778 779 /* if we received the response anyway, don't signal error */ 780 if (req->status == REQ_STATUS_RCVD) 781 err = 0; 782 } 783 recalc_sigpending: 784 if (sigpending) { 785 spin_lock_irqsave(¤t->sighand->siglock, flags); 786 recalc_sigpending(); 787 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 788 } 789 if (err < 0) 790 goto reterr; 791 792 err = p9_check_errors(c, req); 793 trace_9p_client_res(c, type, req->rc.tag, err); 794 if (!err) 795 return req; 796 reterr: 797 p9_tag_remove(c, req); 798 return ERR_PTR(safe_errno(err)); 799 } 800 801 /** 802 * p9_client_zc_rpc - issue a request and wait for a response 803 * @c: client session 804 * @type: type of request 805 * @uidata: destination for zero copy read 806 * @uodata: source for zero copy write 807 * @inlen: read buffer size 808 * @olen: write buffer size 809 * @in_hdrlen: reader header size, This is the size of response protocol data 810 * @fmt: protocol format string (see protocol.c) 811 * 812 * Returns request structure (which client must free using p9_tag_remove) 813 */ 814 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 815 struct iov_iter *uidata, 816 struct iov_iter *uodata, 817 int inlen, int olen, int in_hdrlen, 818 const char *fmt, ...) 819 { 820 va_list ap; 821 int sigpending, err; 822 unsigned long flags; 823 struct p9_req_t *req; 824 825 va_start(ap, fmt); 826 /* We allocate a inline protocol data of only 4k bytes. 827 * The actual content is passed in zero-copy fashion. 828 */ 829 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); 830 va_end(ap); 831 if (IS_ERR(req)) 832 return req; 833 834 if (signal_pending(current)) { 835 sigpending = 1; 836 clear_thread_flag(TIF_SIGPENDING); 837 } else { 838 sigpending = 0; 839 } 840 841 err = c->trans_mod->zc_request(c, req, uidata, uodata, 842 inlen, olen, in_hdrlen); 843 if (err < 0) { 844 if (err == -EIO) 845 c->status = Disconnected; 846 if (err != -ERESTARTSYS) 847 goto recalc_sigpending; 848 } 849 if (req->status == REQ_STATUS_ERROR) { 850 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 851 err = req->t_err; 852 } 853 if (err == -ERESTARTSYS && c->status == Connected) { 854 p9_debug(P9_DEBUG_MUX, "flushing\n"); 855 sigpending = 1; 856 clear_thread_flag(TIF_SIGPENDING); 857 858 if (c->trans_mod->cancel(c, req)) 859 p9_client_flush(c, req); 860 861 /* if we received the response anyway, don't signal error */ 862 if (req->status == REQ_STATUS_RCVD) 863 err = 0; 864 } 865 recalc_sigpending: 866 if (sigpending) { 867 spin_lock_irqsave(¤t->sighand->siglock, flags); 868 recalc_sigpending(); 869 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 870 } 871 if (err < 0) 872 goto reterr; 873 874 err = p9_check_zc_errors(c, req, uidata, in_hdrlen); 875 trace_9p_client_res(c, type, req->rc.tag, err); 876 if (!err) 877 return req; 878 reterr: 879 p9_tag_remove(c, req); 880 return ERR_PTR(safe_errno(err)); 881 } 882 883 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 884 { 885 int ret; 886 struct p9_fid *fid; 887 888 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 889 fid = kmalloc(sizeof(*fid), GFP_KERNEL); 890 if (!fid) 891 return NULL; 892 893 memset(&fid->qid, 0, sizeof(fid->qid)); 894 fid->mode = -1; 895 fid->uid = current_fsuid(); 896 fid->clnt = clnt; 897 fid->rdir = NULL; 898 fid->fid = 0; 899 refcount_set(&fid->count, 1); 900 901 idr_preload(GFP_KERNEL); 902 spin_lock_irq(&clnt->lock); 903 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, 904 GFP_NOWAIT); 905 spin_unlock_irq(&clnt->lock); 906 idr_preload_end(); 907 if (!ret) { 908 trace_9p_fid_ref(fid, P9_FID_REF_CREATE); 909 return fid; 910 } 911 912 kfree(fid); 913 return NULL; 914 } 915 916 static void p9_fid_destroy(struct p9_fid *fid) 917 { 918 struct p9_client *clnt; 919 unsigned long flags; 920 921 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 922 trace_9p_fid_ref(fid, P9_FID_REF_DESTROY); 923 clnt = fid->clnt; 924 spin_lock_irqsave(&clnt->lock, flags); 925 idr_remove(&clnt->fids, fid->fid); 926 spin_unlock_irqrestore(&clnt->lock, flags); 927 kfree(fid->rdir); 928 kfree(fid); 929 } 930 931 /* We also need to export tracepoint symbols for tracepoint_enabled() */ 932 EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref); 933 934 void do_trace_9p_fid_get(struct p9_fid *fid) 935 { 936 trace_9p_fid_ref(fid, P9_FID_REF_GET); 937 } 938 EXPORT_SYMBOL(do_trace_9p_fid_get); 939 940 void do_trace_9p_fid_put(struct p9_fid *fid) 941 { 942 trace_9p_fid_ref(fid, P9_FID_REF_PUT); 943 } 944 EXPORT_SYMBOL(do_trace_9p_fid_put); 945 946 static int p9_client_version(struct p9_client *c) 947 { 948 int err = 0; 949 struct p9_req_t *req; 950 char *version = NULL; 951 int msize; 952 953 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 954 c->msize, c->proto_version); 955 956 switch (c->proto_version) { 957 case p9_proto_2000L: 958 req = p9_client_rpc(c, P9_TVERSION, "ds", 959 c->msize, "9P2000.L"); 960 break; 961 case p9_proto_2000u: 962 req = p9_client_rpc(c, P9_TVERSION, "ds", 963 c->msize, "9P2000.u"); 964 break; 965 case p9_proto_legacy: 966 req = p9_client_rpc(c, P9_TVERSION, "ds", 967 c->msize, "9P2000"); 968 break; 969 default: 970 return -EINVAL; 971 } 972 973 if (IS_ERR(req)) 974 return PTR_ERR(req); 975 976 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); 977 if (err) { 978 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 979 trace_9p_protocol_dump(c, &req->rc); 980 goto error; 981 } 982 983 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 984 if (!strncmp(version, "9P2000.L", 8)) { 985 c->proto_version = p9_proto_2000L; 986 } else if (!strncmp(version, "9P2000.u", 8)) { 987 c->proto_version = p9_proto_2000u; 988 } else if (!strncmp(version, "9P2000", 6)) { 989 c->proto_version = p9_proto_legacy; 990 } else { 991 p9_debug(P9_DEBUG_ERROR, 992 "server returned an unknown version: %s\n", version); 993 err = -EREMOTEIO; 994 goto error; 995 } 996 997 if (msize < 4096) { 998 p9_debug(P9_DEBUG_ERROR, 999 "server returned a msize < 4096: %d\n", msize); 1000 err = -EREMOTEIO; 1001 goto error; 1002 } 1003 if (msize < c->msize) 1004 c->msize = msize; 1005 1006 error: 1007 kfree(version); 1008 p9_tag_remove(c, req); 1009 1010 return err; 1011 } 1012 1013 struct p9_client *p9_client_create(const char *dev_name, char *options) 1014 { 1015 int err; 1016 struct p9_client *clnt; 1017 char *client_id; 1018 1019 err = 0; 1020 clnt = kmalloc(sizeof(*clnt), GFP_KERNEL); 1021 if (!clnt) 1022 return ERR_PTR(-ENOMEM); 1023 1024 clnt->trans_mod = NULL; 1025 clnt->trans = NULL; 1026 clnt->fcall_cache = NULL; 1027 1028 client_id = utsname()->nodename; 1029 memcpy(clnt->name, client_id, strlen(client_id) + 1); 1030 1031 spin_lock_init(&clnt->lock); 1032 idr_init(&clnt->fids); 1033 idr_init(&clnt->reqs); 1034 1035 err = parse_opts(options, clnt); 1036 if (err < 0) 1037 goto free_client; 1038 1039 if (!clnt->trans_mod) 1040 clnt->trans_mod = v9fs_get_default_trans(); 1041 1042 if (!clnt->trans_mod) { 1043 err = -EPROTONOSUPPORT; 1044 p9_debug(P9_DEBUG_ERROR, 1045 "No transport defined or default transport\n"); 1046 goto free_client; 1047 } 1048 1049 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1050 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1051 1052 err = clnt->trans_mod->create(clnt, dev_name, options); 1053 if (err) 1054 goto put_trans; 1055 1056 if (clnt->msize > clnt->trans_mod->maxsize) { 1057 clnt->msize = clnt->trans_mod->maxsize; 1058 pr_info("Limiting 'msize' to %d as this is the maximum " 1059 "supported by transport %s\n", 1060 clnt->msize, clnt->trans_mod->name 1061 ); 1062 } 1063 1064 if (clnt->msize < 4096) { 1065 p9_debug(P9_DEBUG_ERROR, 1066 "Please specify a msize of at least 4k\n"); 1067 err = -EINVAL; 1068 goto close_trans; 1069 } 1070 1071 err = p9_client_version(clnt); 1072 if (err) 1073 goto close_trans; 1074 1075 /* P9_HDRSZ + 4 is the smallest packet header we can have that is 1076 * followed by data accessed from userspace by read 1077 */ 1078 clnt->fcall_cache = 1079 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, 1080 0, 0, P9_HDRSZ + 4, 1081 clnt->msize - (P9_HDRSZ + 4), 1082 NULL); 1083 1084 return clnt; 1085 1086 close_trans: 1087 clnt->trans_mod->close(clnt); 1088 put_trans: 1089 v9fs_put_trans(clnt->trans_mod); 1090 free_client: 1091 kfree(clnt); 1092 return ERR_PTR(err); 1093 } 1094 EXPORT_SYMBOL(p9_client_create); 1095 1096 void p9_client_destroy(struct p9_client *clnt) 1097 { 1098 struct p9_fid *fid; 1099 int id; 1100 1101 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1102 1103 if (clnt->trans_mod) 1104 clnt->trans_mod->close(clnt); 1105 1106 v9fs_put_trans(clnt->trans_mod); 1107 1108 idr_for_each_entry(&clnt->fids, fid, id) { 1109 pr_info("Found fid %d not clunked\n", fid->fid); 1110 p9_fid_destroy(fid); 1111 } 1112 1113 p9_tag_cleanup(clnt); 1114 1115 kmem_cache_destroy(clnt->fcall_cache); 1116 kfree(clnt); 1117 } 1118 EXPORT_SYMBOL(p9_client_destroy); 1119 1120 void p9_client_disconnect(struct p9_client *clnt) 1121 { 1122 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1123 clnt->status = Disconnected; 1124 } 1125 EXPORT_SYMBOL(p9_client_disconnect); 1126 1127 void p9_client_begin_disconnect(struct p9_client *clnt) 1128 { 1129 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1130 clnt->status = BeginDisconnect; 1131 } 1132 EXPORT_SYMBOL(p9_client_begin_disconnect); 1133 1134 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1135 const char *uname, kuid_t n_uname, 1136 const char *aname) 1137 { 1138 int err = 0; 1139 struct p9_req_t *req; 1140 struct p9_fid *fid; 1141 struct p9_qid qid; 1142 1143 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1144 afid ? afid->fid : -1, uname, aname); 1145 fid = p9_fid_create(clnt); 1146 if (!fid) { 1147 err = -ENOMEM; 1148 goto error; 1149 } 1150 fid->uid = n_uname; 1151 1152 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1153 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1154 if (IS_ERR(req)) { 1155 err = PTR_ERR(req); 1156 goto error; 1157 } 1158 1159 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); 1160 if (err) { 1161 trace_9p_protocol_dump(clnt, &req->rc); 1162 p9_tag_remove(clnt, req); 1163 goto error; 1164 } 1165 1166 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1167 qid.type, qid.path, qid.version); 1168 1169 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1170 1171 p9_tag_remove(clnt, req); 1172 return fid; 1173 1174 error: 1175 if (fid) 1176 p9_fid_destroy(fid); 1177 return ERR_PTR(err); 1178 } 1179 EXPORT_SYMBOL(p9_client_attach); 1180 1181 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1182 const unsigned char * const *wnames, int clone) 1183 { 1184 int err; 1185 struct p9_client *clnt; 1186 struct p9_fid *fid; 1187 struct p9_qid *wqids; 1188 struct p9_req_t *req; 1189 u16 nwqids, count; 1190 1191 err = 0; 1192 wqids = NULL; 1193 clnt = oldfid->clnt; 1194 if (clone) { 1195 fid = p9_fid_create(clnt); 1196 if (!fid) { 1197 err = -ENOMEM; 1198 goto error; 1199 } 1200 1201 fid->uid = oldfid->uid; 1202 } else { 1203 fid = oldfid; 1204 } 1205 1206 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1207 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1208 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1209 nwname, wnames); 1210 if (IS_ERR(req)) { 1211 err = PTR_ERR(req); 1212 goto error; 1213 } 1214 1215 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1216 if (err) { 1217 trace_9p_protocol_dump(clnt, &req->rc); 1218 p9_tag_remove(clnt, req); 1219 goto clunk_fid; 1220 } 1221 p9_tag_remove(clnt, req); 1222 1223 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1224 1225 if (nwqids != nwname) { 1226 err = -ENOENT; 1227 goto clunk_fid; 1228 } 1229 1230 for (count = 0; count < nwqids; count++) 1231 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1232 count, wqids[count].type, 1233 wqids[count].path, 1234 wqids[count].version); 1235 1236 if (nwname) 1237 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1238 else 1239 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); 1240 1241 kfree(wqids); 1242 return fid; 1243 1244 clunk_fid: 1245 kfree(wqids); 1246 p9_fid_put(fid); 1247 fid = NULL; 1248 1249 error: 1250 if (fid && fid != oldfid) 1251 p9_fid_destroy(fid); 1252 1253 return ERR_PTR(err); 1254 } 1255 EXPORT_SYMBOL(p9_client_walk); 1256 1257 int p9_client_open(struct p9_fid *fid, int mode) 1258 { 1259 int err; 1260 struct p9_client *clnt; 1261 struct p9_req_t *req; 1262 struct p9_qid qid; 1263 int iounit; 1264 1265 clnt = fid->clnt; 1266 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1267 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1268 err = 0; 1269 1270 if (fid->mode != -1) 1271 return -EINVAL; 1272 1273 if (p9_is_proto_dotl(clnt)) 1274 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1275 else 1276 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1277 if (IS_ERR(req)) { 1278 err = PTR_ERR(req); 1279 goto error; 1280 } 1281 1282 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1283 if (err) { 1284 trace_9p_protocol_dump(clnt, &req->rc); 1285 goto free_and_error; 1286 } 1287 1288 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1289 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1290 qid.path, qid.version, iounit); 1291 1292 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1293 fid->mode = mode; 1294 fid->iounit = iounit; 1295 1296 free_and_error: 1297 p9_tag_remove(clnt, req); 1298 error: 1299 return err; 1300 } 1301 EXPORT_SYMBOL(p9_client_open); 1302 1303 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, 1304 u32 mode, kgid_t gid, struct p9_qid *qid) 1305 { 1306 int err = 0; 1307 struct p9_client *clnt; 1308 struct p9_req_t *req; 1309 int iounit; 1310 1311 p9_debug(P9_DEBUG_9P, 1312 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1313 ofid->fid, name, flags, mode, 1314 from_kgid(&init_user_ns, gid)); 1315 clnt = ofid->clnt; 1316 1317 if (ofid->mode != -1) 1318 return -EINVAL; 1319 1320 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1321 mode, gid); 1322 if (IS_ERR(req)) { 1323 err = PTR_ERR(req); 1324 goto error; 1325 } 1326 1327 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); 1328 if (err) { 1329 trace_9p_protocol_dump(clnt, &req->rc); 1330 goto free_and_error; 1331 } 1332 1333 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1334 qid->type, qid->path, qid->version, iounit); 1335 1336 memmove(&ofid->qid, qid, sizeof(struct p9_qid)); 1337 ofid->mode = mode; 1338 ofid->iounit = iounit; 1339 1340 free_and_error: 1341 p9_tag_remove(clnt, req); 1342 error: 1343 return err; 1344 } 1345 EXPORT_SYMBOL(p9_client_create_dotl); 1346 1347 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1348 char *extension) 1349 { 1350 int err; 1351 struct p9_client *clnt; 1352 struct p9_req_t *req; 1353 struct p9_qid qid; 1354 int iounit; 1355 1356 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1357 fid->fid, name, perm, mode); 1358 err = 0; 1359 clnt = fid->clnt; 1360 1361 if (fid->mode != -1) 1362 return -EINVAL; 1363 1364 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1365 mode, extension); 1366 if (IS_ERR(req)) { 1367 err = PTR_ERR(req); 1368 goto error; 1369 } 1370 1371 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1372 if (err) { 1373 trace_9p_protocol_dump(clnt, &req->rc); 1374 goto free_and_error; 1375 } 1376 1377 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1378 qid.type, qid.path, qid.version, iounit); 1379 1380 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1381 fid->mode = mode; 1382 fid->iounit = iounit; 1383 1384 free_and_error: 1385 p9_tag_remove(clnt, req); 1386 error: 1387 return err; 1388 } 1389 EXPORT_SYMBOL(p9_client_fcreate); 1390 1391 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1392 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1393 { 1394 int err = 0; 1395 struct p9_client *clnt; 1396 struct p9_req_t *req; 1397 1398 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1399 dfid->fid, name, symtgt); 1400 clnt = dfid->clnt; 1401 1402 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1403 gid); 1404 if (IS_ERR(req)) { 1405 err = PTR_ERR(req); 1406 goto error; 1407 } 1408 1409 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 1410 if (err) { 1411 trace_9p_protocol_dump(clnt, &req->rc); 1412 goto free_and_error; 1413 } 1414 1415 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1416 qid->type, qid->path, qid->version); 1417 1418 free_and_error: 1419 p9_tag_remove(clnt, req); 1420 error: 1421 return err; 1422 } 1423 EXPORT_SYMBOL(p9_client_symlink); 1424 1425 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1426 { 1427 struct p9_client *clnt; 1428 struct p9_req_t *req; 1429 1430 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1431 dfid->fid, oldfid->fid, newname); 1432 clnt = dfid->clnt; 1433 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1434 newname); 1435 if (IS_ERR(req)) 1436 return PTR_ERR(req); 1437 1438 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1439 p9_tag_remove(clnt, req); 1440 return 0; 1441 } 1442 EXPORT_SYMBOL(p9_client_link); 1443 1444 int p9_client_fsync(struct p9_fid *fid, int datasync) 1445 { 1446 int err; 1447 struct p9_client *clnt; 1448 struct p9_req_t *req; 1449 1450 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1451 fid->fid, datasync); 1452 err = 0; 1453 clnt = fid->clnt; 1454 1455 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1456 if (IS_ERR(req)) { 1457 err = PTR_ERR(req); 1458 goto error; 1459 } 1460 1461 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1462 1463 p9_tag_remove(clnt, req); 1464 1465 error: 1466 return err; 1467 } 1468 EXPORT_SYMBOL(p9_client_fsync); 1469 1470 int p9_client_clunk(struct p9_fid *fid) 1471 { 1472 int err; 1473 struct p9_client *clnt; 1474 struct p9_req_t *req; 1475 int retries = 0; 1476 1477 again: 1478 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", 1479 fid->fid, retries); 1480 err = 0; 1481 clnt = fid->clnt; 1482 1483 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1484 if (IS_ERR(req)) { 1485 err = PTR_ERR(req); 1486 goto error; 1487 } 1488 1489 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1490 1491 p9_tag_remove(clnt, req); 1492 error: 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 } 1503 return err; 1504 } 1505 EXPORT_SYMBOL(p9_client_clunk); 1506 1507 int p9_client_remove(struct p9_fid *fid) 1508 { 1509 int err; 1510 struct p9_client *clnt; 1511 struct p9_req_t *req; 1512 1513 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1514 err = 0; 1515 clnt = fid->clnt; 1516 1517 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1518 if (IS_ERR(req)) { 1519 err = PTR_ERR(req); 1520 goto error; 1521 } 1522 1523 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1524 1525 p9_tag_remove(clnt, req); 1526 error: 1527 if (err == -ERESTARTSYS) 1528 p9_fid_put(fid); 1529 else 1530 p9_fid_destroy(fid); 1531 return err; 1532 } 1533 EXPORT_SYMBOL(p9_client_remove); 1534 1535 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1536 { 1537 int err = 0; 1538 struct p9_req_t *req; 1539 struct p9_client *clnt; 1540 1541 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1542 dfid->fid, name, flags); 1543 1544 clnt = dfid->clnt; 1545 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1546 if (IS_ERR(req)) { 1547 err = PTR_ERR(req); 1548 goto error; 1549 } 1550 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1551 1552 p9_tag_remove(clnt, req); 1553 error: 1554 return err; 1555 } 1556 EXPORT_SYMBOL(p9_client_unlinkat); 1557 1558 int 1559 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1560 { 1561 int total = 0; 1562 *err = 0; 1563 1564 while (iov_iter_count(to)) { 1565 int count; 1566 1567 count = p9_client_read_once(fid, offset, to, err); 1568 if (!count || *err) 1569 break; 1570 offset += count; 1571 total += count; 1572 } 1573 return total; 1574 } 1575 EXPORT_SYMBOL(p9_client_read); 1576 1577 int 1578 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, 1579 int *err) 1580 { 1581 struct p9_client *clnt = fid->clnt; 1582 struct p9_req_t *req; 1583 int count = iov_iter_count(to); 1584 int rsize, non_zc = 0; 1585 char *dataptr; 1586 1587 *err = 0; 1588 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n", 1589 fid->fid, offset, iov_iter_count(to)); 1590 1591 rsize = fid->iounit; 1592 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1593 rsize = clnt->msize - P9_IOHDRSZ; 1594 1595 if (count < rsize) 1596 rsize = count; 1597 1598 /* Don't bother zerocopy for small IO (< 1024) */ 1599 if (clnt->trans_mod->zc_request && rsize > 1024) { 1600 /* response header len is 11 1601 * PDU Header(7) + IO Size (4) 1602 */ 1603 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1604 0, 11, "dqd", fid->fid, 1605 offset, rsize); 1606 } else { 1607 non_zc = 1; 1608 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1609 rsize); 1610 } 1611 if (IS_ERR(req)) { 1612 *err = PTR_ERR(req); 1613 return 0; 1614 } 1615 1616 *err = p9pdu_readf(&req->rc, clnt->proto_version, 1617 "D", &count, &dataptr); 1618 if (*err) { 1619 trace_9p_protocol_dump(clnt, &req->rc); 1620 p9_tag_remove(clnt, req); 1621 return 0; 1622 } 1623 if (rsize < count) { 1624 pr_err("bogus RREAD count (%d > %d)\n", count, rsize); 1625 count = rsize; 1626 } 1627 1628 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1629 1630 if (non_zc) { 1631 int n = copy_to_iter(dataptr, count, to); 1632 1633 if (n != count) { 1634 *err = -EFAULT; 1635 p9_tag_remove(clnt, req); 1636 return n; 1637 } 1638 } else { 1639 iov_iter_advance(to, count); 1640 } 1641 p9_tag_remove(clnt, req); 1642 return count; 1643 } 1644 EXPORT_SYMBOL(p9_client_read_once); 1645 1646 int 1647 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1648 { 1649 struct p9_client *clnt = fid->clnt; 1650 struct p9_req_t *req; 1651 int total = 0; 1652 *err = 0; 1653 1654 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", 1655 fid->fid, offset, iov_iter_count(from)); 1656 1657 while (iov_iter_count(from)) { 1658 int count = iov_iter_count(from); 1659 int rsize = fid->iounit; 1660 1661 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1662 rsize = clnt->msize - P9_IOHDRSZ; 1663 1664 if (count < rsize) 1665 rsize = count; 1666 1667 /* Don't bother zerocopy for small IO (< 1024) */ 1668 if (clnt->trans_mod->zc_request && rsize > 1024) { 1669 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1670 rsize, P9_ZC_HDR_SZ, "dqd", 1671 fid->fid, offset, rsize); 1672 } else { 1673 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1674 offset, rsize, from); 1675 } 1676 if (IS_ERR(req)) { 1677 *err = PTR_ERR(req); 1678 break; 1679 } 1680 1681 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count); 1682 if (*err) { 1683 trace_9p_protocol_dump(clnt, &req->rc); 1684 p9_tag_remove(clnt, req); 1685 break; 1686 } 1687 if (rsize < count) { 1688 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize); 1689 count = rsize; 1690 } 1691 1692 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1693 1694 p9_tag_remove(clnt, req); 1695 iov_iter_advance(from, count); 1696 total += count; 1697 offset += count; 1698 } 1699 return total; 1700 } 1701 EXPORT_SYMBOL(p9_client_write); 1702 1703 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1704 { 1705 int err; 1706 struct p9_client *clnt; 1707 struct p9_wstat *ret; 1708 struct p9_req_t *req; 1709 u16 ignored; 1710 1711 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1712 1713 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 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, ret->qid.path, 1739 ret->qid.version, ret->mode, 1740 ret->atime, ret->mtime, 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; 1761 struct p9_req_t *req; 1762 1763 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1764 fid->fid, request_mask); 1765 1766 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 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, "<<< RGETATTR st_result_mask=%lld\n" 1787 "<<< qid=%x.%llx.%x\n" 1788 "<<< st_mode=%8.8x st_nlink=%llu\n" 1789 "<<< st_uid=%d st_gid=%d\n" 1790 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1791 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1792 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1793 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1794 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1795 "<<< st_gen=%lld st_data_version=%lld\n", 1796 ret->st_result_mask, 1797 ret->qid.type, ret->qid.path, ret->qid.version, 1798 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, ret->st_blocks, 1802 ret->st_atime_sec, ret->st_atime_nsec, 1803 ret->st_mtime_sec, ret->st_mtime_nsec, 1804 ret->st_ctime_sec, ret->st_ctime_nsec, 1805 ret->st_btime_sec, ret->st_btime_nsec, 1806 ret->st_gen, ret->st_data_version); 1807 1808 p9_tag_remove(clnt, req); 1809 return ret; 1810 1811 error: 1812 kfree(ret); 1813 return ERR_PTR(err); 1814 } 1815 EXPORT_SYMBOL(p9_client_getattr_dotl); 1816 1817 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1818 { 1819 int ret; 1820 1821 /* NOTE: size shouldn't include its own length */ 1822 /* size[2] type[2] dev[4] qid[13] */ 1823 /* mode[4] atime[4] mtime[4] length[8]*/ 1824 /* name[s] uid[s] gid[s] muid[s] */ 1825 ret = 2 + 4 + 13 + 4 + 4 + 4 + 8 + 2 + 2 + 2 + 2; 1826 1827 if (wst->name) 1828 ret += strlen(wst->name); 1829 if (wst->uid) 1830 ret += strlen(wst->uid); 1831 if (wst->gid) 1832 ret += strlen(wst->gid); 1833 if (wst->muid) 1834 ret += strlen(wst->muid); 1835 1836 if (proto_version == p9_proto_2000u || 1837 proto_version == p9_proto_2000L) { 1838 /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1839 ret += 2 + 4 + 4 + 4; 1840 if (wst->extension) 1841 ret += strlen(wst->extension); 1842 } 1843 1844 return ret; 1845 } 1846 1847 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1848 { 1849 int err; 1850 struct p9_req_t *req; 1851 struct p9_client *clnt; 1852 1853 err = 0; 1854 clnt = fid->clnt; 1855 wst->size = p9_client_statsize(wst, clnt->proto_version); 1856 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", 1857 fid->fid); 1858 p9_debug(P9_DEBUG_9P, 1859 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1860 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1861 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1862 " uid=%d gid=%d n_muid=%d\n", 1863 wst->size, wst->type, wst->dev, wst->qid.type, 1864 wst->qid.path, wst->qid.version, 1865 wst->mode, wst->atime, wst->mtime, wst->length, 1866 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1867 from_kuid(&init_user_ns, wst->n_uid), 1868 from_kgid(&init_user_ns, wst->n_gid), 1869 from_kuid(&init_user_ns, wst->n_muid)); 1870 1871 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", 1872 fid->fid, wst->size + 2, wst); 1873 if (IS_ERR(req)) { 1874 err = PTR_ERR(req); 1875 goto error; 1876 } 1877 1878 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1879 1880 p9_tag_remove(clnt, req); 1881 error: 1882 return err; 1883 } 1884 EXPORT_SYMBOL(p9_client_wstat); 1885 1886 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1887 { 1888 int err; 1889 struct p9_req_t *req; 1890 struct p9_client *clnt; 1891 1892 err = 0; 1893 clnt = fid->clnt; 1894 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1895 p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n", 1896 p9attr->valid, p9attr->mode, 1897 from_kuid(&init_user_ns, p9attr->uid), 1898 from_kgid(&init_user_ns, p9attr->gid), 1899 p9attr->size); 1900 p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n", 1901 p9attr->atime_sec, p9attr->atime_nsec); 1902 p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n", 1903 p9attr->mtime_sec, p9attr->mtime_nsec); 1904 1905 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1906 1907 if (IS_ERR(req)) { 1908 err = PTR_ERR(req); 1909 goto error; 1910 } 1911 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1912 p9_tag_remove(clnt, req); 1913 error: 1914 return err; 1915 } 1916 EXPORT_SYMBOL(p9_client_setattr); 1917 1918 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1919 { 1920 int err; 1921 struct p9_req_t *req; 1922 struct p9_client *clnt; 1923 1924 err = 0; 1925 clnt = fid->clnt; 1926 1927 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1928 1929 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1930 if (IS_ERR(req)) { 1931 err = PTR_ERR(req); 1932 goto error; 1933 } 1934 1935 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1936 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1937 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1938 if (err) { 1939 trace_9p_protocol_dump(clnt, &req->rc); 1940 p9_tag_remove(clnt, req); 1941 goto error; 1942 } 1943 1944 p9_debug(P9_DEBUG_9P, 1945 "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n", 1946 fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree, 1947 sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen); 1948 1949 p9_tag_remove(clnt, req); 1950 error: 1951 return err; 1952 } 1953 EXPORT_SYMBOL(p9_client_statfs); 1954 1955 int p9_client_rename(struct p9_fid *fid, 1956 struct p9_fid *newdirfid, const char *name) 1957 { 1958 int err; 1959 struct p9_req_t *req; 1960 struct p9_client *clnt; 1961 1962 err = 0; 1963 clnt = fid->clnt; 1964 1965 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1966 fid->fid, newdirfid->fid, name); 1967 1968 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1969 newdirfid->fid, name); 1970 if (IS_ERR(req)) { 1971 err = PTR_ERR(req); 1972 goto error; 1973 } 1974 1975 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1976 1977 p9_tag_remove(clnt, req); 1978 error: 1979 return err; 1980 } 1981 EXPORT_SYMBOL(p9_client_rename); 1982 1983 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1984 struct p9_fid *newdirfid, const char *new_name) 1985 { 1986 int err; 1987 struct p9_req_t *req; 1988 struct p9_client *clnt; 1989 1990 err = 0; 1991 clnt = olddirfid->clnt; 1992 1993 p9_debug(P9_DEBUG_9P, 1994 ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n", 1995 olddirfid->fid, old_name, newdirfid->fid, new_name); 1996 1997 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1998 old_name, newdirfid->fid, new_name); 1999 if (IS_ERR(req)) { 2000 err = PTR_ERR(req); 2001 goto error; 2002 } 2003 2004 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 2005 newdirfid->fid, new_name); 2006 2007 p9_tag_remove(clnt, req); 2008 error: 2009 return err; 2010 } 2011 EXPORT_SYMBOL(p9_client_renameat); 2012 2013 /* An xattrwalk without @attr_name gives the fid for the lisxattr namespace 2014 */ 2015 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 2016 const char *attr_name, u64 *attr_size) 2017 { 2018 int err; 2019 struct p9_req_t *req; 2020 struct p9_client *clnt; 2021 struct p9_fid *attr_fid; 2022 2023 err = 0; 2024 clnt = file_fid->clnt; 2025 attr_fid = p9_fid_create(clnt); 2026 if (!attr_fid) { 2027 err = -ENOMEM; 2028 goto error; 2029 } 2030 p9_debug(P9_DEBUG_9P, 2031 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 2032 file_fid->fid, attr_fid->fid, attr_name); 2033 2034 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 2035 file_fid->fid, attr_fid->fid, attr_name); 2036 if (IS_ERR(req)) { 2037 err = PTR_ERR(req); 2038 goto error; 2039 } 2040 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); 2041 if (err) { 2042 trace_9p_protocol_dump(clnt, &req->rc); 2043 p9_tag_remove(clnt, req); 2044 goto clunk_fid; 2045 } 2046 p9_tag_remove(clnt, req); 2047 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2048 attr_fid->fid, *attr_size); 2049 return attr_fid; 2050 clunk_fid: 2051 p9_fid_put(attr_fid); 2052 attr_fid = NULL; 2053 error: 2054 if (attr_fid && attr_fid != file_fid) 2055 p9_fid_destroy(attr_fid); 2056 2057 return ERR_PTR(err); 2058 } 2059 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2060 2061 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2062 u64 attr_size, int flags) 2063 { 2064 int err; 2065 struct p9_req_t *req; 2066 struct p9_client *clnt; 2067 2068 p9_debug(P9_DEBUG_9P, 2069 ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n", 2070 fid->fid, name, attr_size, flags); 2071 err = 0; 2072 clnt = fid->clnt; 2073 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2074 fid->fid, name, attr_size, flags); 2075 if (IS_ERR(req)) { 2076 err = PTR_ERR(req); 2077 goto error; 2078 } 2079 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2080 p9_tag_remove(clnt, req); 2081 error: 2082 return err; 2083 } 2084 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2085 2086 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2087 { 2088 int err, rsize, non_zc = 0; 2089 struct p9_client *clnt; 2090 struct p9_req_t *req; 2091 char *dataptr; 2092 struct kvec kv = {.iov_base = data, .iov_len = count}; 2093 struct iov_iter to; 2094 2095 iov_iter_kvec(&to, READ, &kv, 1, count); 2096 2097 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2098 fid->fid, offset, count); 2099 2100 err = 0; 2101 clnt = fid->clnt; 2102 2103 rsize = fid->iounit; 2104 if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ) 2105 rsize = clnt->msize - P9_READDIRHDRSZ; 2106 2107 if (count < rsize) 2108 rsize = count; 2109 2110 /* Don't bother zerocopy for small IO (< 1024) */ 2111 if (clnt->trans_mod->zc_request && rsize > 1024) { 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, 2162 ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n", 2163 fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2164 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2165 MAJOR(rdev), MINOR(rdev), gid); 2166 if (IS_ERR(req)) 2167 return PTR_ERR(req); 2168 2169 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2170 if (err) { 2171 trace_9p_protocol_dump(clnt, &req->rc); 2172 goto error; 2173 } 2174 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", 2175 qid->type, qid->path, qid->version); 2176 2177 error: 2178 p9_tag_remove(clnt, req); 2179 return err; 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", 2195 fid->fid, name, mode, 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 qid->path, qid->version); 2206 2207 error: 2208 p9_tag_remove(clnt, req); 2209 return err; 2210 } 2211 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2212 2213 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2214 { 2215 int err; 2216 struct p9_client *clnt; 2217 struct p9_req_t *req; 2218 2219 err = 0; 2220 clnt = fid->clnt; 2221 p9_debug(P9_DEBUG_9P, 2222 ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n", 2223 fid->fid, flock->type, flock->flags, flock->start, 2224 flock->length, flock->proc_id, flock->client_id); 2225 2226 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2227 flock->flags, flock->start, flock->length, 2228 flock->proc_id, flock->client_id); 2229 2230 if (IS_ERR(req)) 2231 return PTR_ERR(req); 2232 2233 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); 2234 if (err) { 2235 trace_9p_protocol_dump(clnt, &req->rc); 2236 goto error; 2237 } 2238 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2239 error: 2240 p9_tag_remove(clnt, req); 2241 return err; 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, 2254 ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n", 2255 fid->fid, glock->type, glock->start, glock->length, 2256 glock->proc_id, glock->client_id); 2257 2258 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, 2259 glock->type, glock->start, glock->length, 2260 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, 2273 "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n", 2274 glock->type, glock->start, glock->length, 2275 glock->proc_id, glock->client_id); 2276 error: 2277 p9_tag_remove(clnt, req); 2278 return err; 2279 } 2280 EXPORT_SYMBOL(p9_client_getlock_dotl); 2281 2282 int p9_client_readlink(struct p9_fid *fid, char **target) 2283 { 2284 int err; 2285 struct p9_client *clnt; 2286 struct p9_req_t *req; 2287 2288 err = 0; 2289 clnt = fid->clnt; 2290 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2291 2292 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2293 if (IS_ERR(req)) 2294 return PTR_ERR(req); 2295 2296 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); 2297 if (err) { 2298 trace_9p_protocol_dump(clnt, &req->rc); 2299 goto error; 2300 } 2301 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2302 error: 2303 p9_tag_remove(clnt, req); 2304 return err; 2305 } 2306 EXPORT_SYMBOL(p9_client_readlink); 2307 2308 int __init p9_client_init(void) 2309 { 2310 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); 2311 return p9_req_cache ? 0 : -ENOMEM; 2312 } 2313 2314 void __exit p9_client_exit(void) 2315 { 2316 kmem_cache_destroy(p9_req_cache); 2317 } 2318