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.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(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(r); 371 } 372 373 static void p9_req_free(struct kref *ref) 374 { 375 struct p9_req_t *r = container_of(ref, struct p9_req_t, refcount); 376 377 p9_fcall_fini(&r->tc); 378 p9_fcall_fini(&r->rc); 379 kmem_cache_free(p9_req_cache, r); 380 } 381 382 int p9_req_put(struct p9_req_t *r) 383 { 384 return kref_put(&r->refcount, p9_req_free); 385 } 386 EXPORT_SYMBOL(p9_req_put); 387 388 /** 389 * p9_tag_cleanup - cleans up tags structure and reclaims resources 390 * @c: v9fs client struct 391 * 392 * This frees resources associated with the tags structure 393 * 394 */ 395 static void p9_tag_cleanup(struct p9_client *c) 396 { 397 struct p9_req_t *req; 398 int id; 399 400 rcu_read_lock(); 401 idr_for_each_entry(&c->reqs, req, id) { 402 pr_info("Tag %d still in use\n", id); 403 if (p9_tag_remove(c, req) == 0) 404 pr_warn("Packet with tag %d has still references", 405 req->tc.tag); 406 } 407 rcu_read_unlock(); 408 } 409 410 /** 411 * p9_client_cb - call back from transport to client 412 * @c: client state 413 * @req: request received 414 * @status: request status, one of REQ_STATUS_* 415 * 416 */ 417 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) 418 { 419 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); 420 421 /* This barrier is needed to make sure any change made to req before 422 * the status change is visible to another thread 423 */ 424 smp_wmb(); 425 req->status = status; 426 427 wake_up(&req->wq); 428 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); 429 p9_req_put(req); 430 } 431 EXPORT_SYMBOL(p9_client_cb); 432 433 /** 434 * p9_parse_header - parse header arguments out of a packet 435 * @pdu: packet to parse 436 * @size: size of packet 437 * @type: type of request 438 * @tag: tag of packet 439 * @rewind: set if we need to rewind offset afterwards 440 */ 441 442 int 443 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, 444 int16_t *tag, int rewind) 445 { 446 s8 r_type; 447 s16 r_tag; 448 s32 r_size; 449 int offset = pdu->offset; 450 int err; 451 452 pdu->offset = 0; 453 454 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 455 if (err) 456 goto rewind_and_exit; 457 458 if (type) 459 *type = r_type; 460 if (tag) 461 *tag = r_tag; 462 if (size) 463 *size = r_size; 464 465 if (pdu->size != r_size || r_size < 7) { 466 err = -EINVAL; 467 goto rewind_and_exit; 468 } 469 470 pdu->id = r_type; 471 pdu->tag = r_tag; 472 473 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 474 pdu->size, pdu->id, pdu->tag); 475 476 rewind_and_exit: 477 if (rewind) 478 pdu->offset = offset; 479 return err; 480 } 481 EXPORT_SYMBOL(p9_parse_header); 482 483 /** 484 * p9_check_errors - check 9p packet for error return and process it 485 * @c: current client instance 486 * @req: request to parse and check for error conditions 487 * 488 * returns error code if one is discovered, otherwise returns 0 489 * 490 * this will have to be more complicated if we have multiple 491 * error packet types 492 */ 493 494 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 495 { 496 s8 type; 497 int err; 498 int ecode; 499 500 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 501 if (req->rc.size >= c->msize) { 502 p9_debug(P9_DEBUG_ERROR, 503 "requested packet size too big: %d\n", 504 req->rc.size); 505 return -EIO; 506 } 507 /* dump the response from server 508 * This should be after check errors which poplulate pdu_fcall. 509 */ 510 trace_9p_protocol_dump(c, &req->rc); 511 if (err) { 512 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 513 return err; 514 } 515 if (type != P9_RERROR && type != P9_RLERROR) 516 return 0; 517 518 if (!p9_is_proto_dotl(c)) { 519 char *ename; 520 521 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 522 &ename, &ecode); 523 if (err) 524 goto out_err; 525 526 if (p9_is_proto_dotu(c) && ecode < 512) 527 err = -ecode; 528 529 if (!err) { 530 err = p9_errstr2errno(ename, strlen(ename)); 531 532 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 533 -ecode, ename); 534 } 535 kfree(ename); 536 } else { 537 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 538 if (err) 539 goto out_err; 540 err = -ecode; 541 542 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 543 } 544 545 return err; 546 547 out_err: 548 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 549 550 return err; 551 } 552 553 /** 554 * p9_check_zc_errors - check 9p packet for error return and process it 555 * @c: current client instance 556 * @req: request to parse and check for error conditions 557 * @uidata: external buffer containing error 558 * @in_hdrlen: Size of response protocol buffer. 559 * 560 * returns error code if one is discovered, otherwise returns 0 561 * 562 * this will have to be more complicated if we have multiple 563 * error packet types 564 */ 565 566 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req, 567 struct iov_iter *uidata, int in_hdrlen) 568 { 569 int err; 570 int ecode; 571 s8 type; 572 char *ename = NULL; 573 574 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 575 /* dump the response from server 576 * This should be after parse_header which poplulate pdu_fcall. 577 */ 578 trace_9p_protocol_dump(c, &req->rc); 579 if (err) { 580 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 581 return err; 582 } 583 584 if (type != P9_RERROR && type != P9_RLERROR) 585 return 0; 586 587 if (!p9_is_proto_dotl(c)) { 588 /* Error is reported in string format */ 589 int len; 590 /* 7 = header size for RERROR; */ 591 int inline_len = in_hdrlen - 7; 592 593 len = req->rc.size - req->rc.offset; 594 if (len > (P9_ZC_HDR_SZ - 7)) { 595 err = -EFAULT; 596 goto out_err; 597 } 598 599 ename = &req->rc.sdata[req->rc.offset]; 600 if (len > inline_len) { 601 /* We have error in external buffer */ 602 if (!copy_from_iter_full(ename + inline_len, 603 len - inline_len, uidata)) { 604 err = -EFAULT; 605 goto out_err; 606 } 607 } 608 ename = NULL; 609 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 610 &ename, &ecode); 611 if (err) 612 goto out_err; 613 614 if (p9_is_proto_dotu(c) && ecode < 512) 615 err = -ecode; 616 617 if (!err) { 618 err = p9_errstr2errno(ename, strlen(ename)); 619 620 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 621 -ecode, ename); 622 } 623 kfree(ename); 624 } else { 625 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 626 err = -ecode; 627 628 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 629 } 630 return err; 631 632 out_err: 633 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 634 return err; 635 } 636 637 static struct p9_req_t * 638 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 639 640 /** 641 * p9_client_flush - flush (cancel) a request 642 * @c: client state 643 * @oldreq: request to cancel 644 * 645 * This sents a flush for a particular request and links 646 * the flush request to the original request. The current 647 * code only supports a single flush request although the protocol 648 * allows for multiple flush requests to be sent for a single request. 649 * 650 */ 651 652 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 653 { 654 struct p9_req_t *req; 655 s16 oldtag; 656 int err; 657 658 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); 659 if (err) 660 return err; 661 662 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 663 664 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 665 if (IS_ERR(req)) 666 return PTR_ERR(req); 667 668 /* if we haven't received a response for oldreq, 669 * remove it from the list 670 */ 671 if (oldreq->status == REQ_STATUS_SENT) { 672 if (c->trans_mod->cancelled) 673 c->trans_mod->cancelled(c, oldreq); 674 } 675 676 p9_tag_remove(c, req); 677 return 0; 678 } 679 680 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 681 int8_t type, int req_size, 682 const char *fmt, va_list ap) 683 { 684 int err; 685 struct p9_req_t *req; 686 687 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 688 689 /* we allow for any status other than disconnected */ 690 if (c->status == Disconnected) 691 return ERR_PTR(-EIO); 692 693 /* if status is begin_disconnected we allow only clunk request */ 694 if (c->status == BeginDisconnect && type != P9_TCLUNK) 695 return ERR_PTR(-EIO); 696 697 req = p9_tag_alloc(c, type, req_size); 698 if (IS_ERR(req)) 699 return req; 700 701 /* marshall the data */ 702 p9pdu_prepare(&req->tc, req->tc.tag, type); 703 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); 704 if (err) 705 goto reterr; 706 p9pdu_finalize(c, &req->tc); 707 trace_9p_client_req(c, type, req->tc.tag); 708 return req; 709 reterr: 710 p9_tag_remove(c, req); 711 /* We have to put also the 2nd reference as it won't be used */ 712 p9_req_put(req); 713 return ERR_PTR(err); 714 } 715 716 /** 717 * p9_client_rpc - issue a request and wait for a response 718 * @c: client session 719 * @type: type of request 720 * @fmt: protocol format string (see protocol.c) 721 * 722 * Returns request structure (which client must free using p9_tag_remove) 723 */ 724 725 static struct p9_req_t * 726 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 727 { 728 va_list ap; 729 int sigpending, err; 730 unsigned long flags; 731 struct p9_req_t *req; 732 733 va_start(ap, fmt); 734 req = p9_client_prepare_req(c, type, c->msize, fmt, ap); 735 va_end(ap); 736 if (IS_ERR(req)) 737 return req; 738 739 if (signal_pending(current)) { 740 sigpending = 1; 741 clear_thread_flag(TIF_SIGPENDING); 742 } else { 743 sigpending = 0; 744 } 745 746 err = c->trans_mod->request(c, req); 747 if (err < 0) { 748 /* write won't happen */ 749 p9_req_put(req); 750 if (err != -ERESTARTSYS && err != -EFAULT) 751 c->status = Disconnected; 752 goto recalc_sigpending; 753 } 754 again: 755 /* Wait for the response */ 756 err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD); 757 758 /* Make sure our req is coherent with regard to updates in other 759 * threads - echoes to wmb() in the callback 760 */ 761 smp_rmb(); 762 763 if (err == -ERESTARTSYS && c->status == Connected && 764 type == P9_TFLUSH) { 765 sigpending = 1; 766 clear_thread_flag(TIF_SIGPENDING); 767 goto again; 768 } 769 770 if (req->status == REQ_STATUS_ERROR) { 771 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 772 err = req->t_err; 773 } 774 if (err == -ERESTARTSYS && c->status == Connected) { 775 p9_debug(P9_DEBUG_MUX, "flushing\n"); 776 sigpending = 1; 777 clear_thread_flag(TIF_SIGPENDING); 778 779 if (c->trans_mod->cancel(c, req)) 780 p9_client_flush(c, req); 781 782 /* if we received the response anyway, don't signal error */ 783 if (req->status == REQ_STATUS_RCVD) 784 err = 0; 785 } 786 recalc_sigpending: 787 if (sigpending) { 788 spin_lock_irqsave(¤t->sighand->siglock, flags); 789 recalc_sigpending(); 790 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 791 } 792 if (err < 0) 793 goto reterr; 794 795 err = p9_check_errors(c, req); 796 trace_9p_client_res(c, type, req->rc.tag, err); 797 if (!err) 798 return req; 799 reterr: 800 p9_tag_remove(c, req); 801 return ERR_PTR(safe_errno(err)); 802 } 803 804 /** 805 * p9_client_zc_rpc - issue a request and wait for a response 806 * @c: client session 807 * @type: type of request 808 * @uidata: destination for zero copy read 809 * @uodata: source for zero copy write 810 * @inlen: read buffer size 811 * @olen: write buffer size 812 * @in_hdrlen: reader header size, This is the size of response protocol data 813 * @fmt: protocol format string (see protocol.c) 814 * 815 * Returns request structure (which client must free using p9_tag_remove) 816 */ 817 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 818 struct iov_iter *uidata, 819 struct iov_iter *uodata, 820 int inlen, int olen, int in_hdrlen, 821 const char *fmt, ...) 822 { 823 va_list ap; 824 int sigpending, err; 825 unsigned long flags; 826 struct p9_req_t *req; 827 828 va_start(ap, fmt); 829 /* We allocate a inline protocol data of only 4k bytes. 830 * The actual content is passed in zero-copy fashion. 831 */ 832 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); 833 va_end(ap); 834 if (IS_ERR(req)) 835 return req; 836 837 if (signal_pending(current)) { 838 sigpending = 1; 839 clear_thread_flag(TIF_SIGPENDING); 840 } else { 841 sigpending = 0; 842 } 843 844 err = c->trans_mod->zc_request(c, req, uidata, uodata, 845 inlen, olen, in_hdrlen); 846 if (err < 0) { 847 if (err == -EIO) 848 c->status = Disconnected; 849 if (err != -ERESTARTSYS) 850 goto recalc_sigpending; 851 } 852 if (req->status == REQ_STATUS_ERROR) { 853 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 854 err = req->t_err; 855 } 856 if (err == -ERESTARTSYS && c->status == Connected) { 857 p9_debug(P9_DEBUG_MUX, "flushing\n"); 858 sigpending = 1; 859 clear_thread_flag(TIF_SIGPENDING); 860 861 if (c->trans_mod->cancel(c, req)) 862 p9_client_flush(c, req); 863 864 /* if we received the response anyway, don't signal error */ 865 if (req->status == REQ_STATUS_RCVD) 866 err = 0; 867 } 868 recalc_sigpending: 869 if (sigpending) { 870 spin_lock_irqsave(¤t->sighand->siglock, flags); 871 recalc_sigpending(); 872 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 873 } 874 if (err < 0) 875 goto reterr; 876 877 err = p9_check_zc_errors(c, req, uidata, in_hdrlen); 878 trace_9p_client_res(c, type, req->rc.tag, err); 879 if (!err) 880 return req; 881 reterr: 882 p9_tag_remove(c, req); 883 return ERR_PTR(safe_errno(err)); 884 } 885 886 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 887 { 888 int ret; 889 struct p9_fid *fid; 890 891 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 892 fid = kmalloc(sizeof(*fid), GFP_KERNEL); 893 if (!fid) 894 return NULL; 895 896 memset(&fid->qid, 0, sizeof(fid->qid)); 897 fid->mode = -1; 898 fid->uid = current_fsuid(); 899 fid->clnt = clnt; 900 fid->rdir = NULL; 901 fid->fid = 0; 902 refcount_set(&fid->count, 1); 903 904 idr_preload(GFP_KERNEL); 905 spin_lock_irq(&clnt->lock); 906 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, 907 GFP_NOWAIT); 908 spin_unlock_irq(&clnt->lock); 909 idr_preload_end(); 910 if (!ret) { 911 trace_9p_fid_ref(fid, P9_FID_REF_CREATE); 912 return fid; 913 } 914 915 kfree(fid); 916 return NULL; 917 } 918 919 static void p9_fid_destroy(struct p9_fid *fid) 920 { 921 struct p9_client *clnt; 922 unsigned long flags; 923 924 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 925 trace_9p_fid_ref(fid, P9_FID_REF_DESTROY); 926 clnt = fid->clnt; 927 spin_lock_irqsave(&clnt->lock, flags); 928 idr_remove(&clnt->fids, fid->fid); 929 spin_unlock_irqrestore(&clnt->lock, flags); 930 kfree(fid->rdir); 931 kfree(fid); 932 } 933 934 /* We also need to export tracepoint symbols for tracepoint_enabled() */ 935 EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref); 936 937 void do_trace_9p_fid_get(struct p9_fid *fid) 938 { 939 trace_9p_fid_ref(fid, P9_FID_REF_GET); 940 } 941 EXPORT_SYMBOL(do_trace_9p_fid_get); 942 943 void do_trace_9p_fid_put(struct p9_fid *fid) 944 { 945 trace_9p_fid_ref(fid, P9_FID_REF_PUT); 946 } 947 EXPORT_SYMBOL(do_trace_9p_fid_put); 948 949 static int p9_client_version(struct p9_client *c) 950 { 951 int err = 0; 952 struct p9_req_t *req; 953 char *version = NULL; 954 int msize; 955 956 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 957 c->msize, c->proto_version); 958 959 switch (c->proto_version) { 960 case p9_proto_2000L: 961 req = p9_client_rpc(c, P9_TVERSION, "ds", 962 c->msize, "9P2000.L"); 963 break; 964 case p9_proto_2000u: 965 req = p9_client_rpc(c, P9_TVERSION, "ds", 966 c->msize, "9P2000.u"); 967 break; 968 case p9_proto_legacy: 969 req = p9_client_rpc(c, P9_TVERSION, "ds", 970 c->msize, "9P2000"); 971 break; 972 default: 973 return -EINVAL; 974 } 975 976 if (IS_ERR(req)) 977 return PTR_ERR(req); 978 979 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); 980 if (err) { 981 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 982 trace_9p_protocol_dump(c, &req->rc); 983 goto error; 984 } 985 986 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 987 if (!strncmp(version, "9P2000.L", 8)) { 988 c->proto_version = p9_proto_2000L; 989 } else if (!strncmp(version, "9P2000.u", 8)) { 990 c->proto_version = p9_proto_2000u; 991 } else if (!strncmp(version, "9P2000", 6)) { 992 c->proto_version = p9_proto_legacy; 993 } else { 994 p9_debug(P9_DEBUG_ERROR, 995 "server returned an unknown version: %s\n", version); 996 err = -EREMOTEIO; 997 goto error; 998 } 999 1000 if (msize < 4096) { 1001 p9_debug(P9_DEBUG_ERROR, 1002 "server returned a msize < 4096: %d\n", msize); 1003 err = -EREMOTEIO; 1004 goto error; 1005 } 1006 if (msize < c->msize) 1007 c->msize = msize; 1008 1009 error: 1010 kfree(version); 1011 p9_tag_remove(c, req); 1012 1013 return err; 1014 } 1015 1016 struct p9_client *p9_client_create(const char *dev_name, char *options) 1017 { 1018 int err; 1019 struct p9_client *clnt; 1020 char *client_id; 1021 1022 err = 0; 1023 clnt = kmalloc(sizeof(*clnt), GFP_KERNEL); 1024 if (!clnt) 1025 return ERR_PTR(-ENOMEM); 1026 1027 clnt->trans_mod = NULL; 1028 clnt->trans = NULL; 1029 clnt->fcall_cache = NULL; 1030 1031 client_id = utsname()->nodename; 1032 memcpy(clnt->name, client_id, strlen(client_id) + 1); 1033 1034 spin_lock_init(&clnt->lock); 1035 idr_init(&clnt->fids); 1036 idr_init(&clnt->reqs); 1037 1038 err = parse_opts(options, clnt); 1039 if (err < 0) 1040 goto free_client; 1041 1042 if (!clnt->trans_mod) 1043 clnt->trans_mod = v9fs_get_default_trans(); 1044 1045 if (!clnt->trans_mod) { 1046 err = -EPROTONOSUPPORT; 1047 p9_debug(P9_DEBUG_ERROR, 1048 "No transport defined or default transport\n"); 1049 goto free_client; 1050 } 1051 1052 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1053 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1054 1055 err = clnt->trans_mod->create(clnt, dev_name, options); 1056 if (err) 1057 goto put_trans; 1058 1059 if (clnt->msize > clnt->trans_mod->maxsize) { 1060 clnt->msize = clnt->trans_mod->maxsize; 1061 pr_info("Limiting 'msize' to %d as this is the maximum " 1062 "supported by transport %s\n", 1063 clnt->msize, clnt->trans_mod->name 1064 ); 1065 } 1066 1067 if (clnt->msize < 4096) { 1068 p9_debug(P9_DEBUG_ERROR, 1069 "Please specify a msize of at least 4k\n"); 1070 err = -EINVAL; 1071 goto close_trans; 1072 } 1073 1074 err = p9_client_version(clnt); 1075 if (err) 1076 goto close_trans; 1077 1078 /* P9_HDRSZ + 4 is the smallest packet header we can have that is 1079 * followed by data accessed from userspace by read 1080 */ 1081 clnt->fcall_cache = 1082 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, 1083 0, 0, P9_HDRSZ + 4, 1084 clnt->msize - (P9_HDRSZ + 4), 1085 NULL); 1086 1087 return clnt; 1088 1089 close_trans: 1090 clnt->trans_mod->close(clnt); 1091 put_trans: 1092 v9fs_put_trans(clnt->trans_mod); 1093 free_client: 1094 kfree(clnt); 1095 return ERR_PTR(err); 1096 } 1097 EXPORT_SYMBOL(p9_client_create); 1098 1099 void p9_client_destroy(struct p9_client *clnt) 1100 { 1101 struct p9_fid *fid; 1102 int id; 1103 1104 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1105 1106 if (clnt->trans_mod) 1107 clnt->trans_mod->close(clnt); 1108 1109 v9fs_put_trans(clnt->trans_mod); 1110 1111 idr_for_each_entry(&clnt->fids, fid, id) { 1112 pr_info("Found fid %d not clunked\n", fid->fid); 1113 p9_fid_destroy(fid); 1114 } 1115 1116 p9_tag_cleanup(clnt); 1117 1118 kmem_cache_destroy(clnt->fcall_cache); 1119 kfree(clnt); 1120 } 1121 EXPORT_SYMBOL(p9_client_destroy); 1122 1123 void p9_client_disconnect(struct p9_client *clnt) 1124 { 1125 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1126 clnt->status = Disconnected; 1127 } 1128 EXPORT_SYMBOL(p9_client_disconnect); 1129 1130 void p9_client_begin_disconnect(struct p9_client *clnt) 1131 { 1132 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1133 clnt->status = BeginDisconnect; 1134 } 1135 EXPORT_SYMBOL(p9_client_begin_disconnect); 1136 1137 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1138 const char *uname, kuid_t n_uname, 1139 const char *aname) 1140 { 1141 int err = 0; 1142 struct p9_req_t *req; 1143 struct p9_fid *fid; 1144 struct p9_qid qid; 1145 1146 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1147 afid ? afid->fid : -1, uname, aname); 1148 fid = p9_fid_create(clnt); 1149 if (!fid) { 1150 err = -ENOMEM; 1151 goto error; 1152 } 1153 fid->uid = n_uname; 1154 1155 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1156 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1157 if (IS_ERR(req)) { 1158 err = PTR_ERR(req); 1159 goto error; 1160 } 1161 1162 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); 1163 if (err) { 1164 trace_9p_protocol_dump(clnt, &req->rc); 1165 p9_tag_remove(clnt, req); 1166 goto error; 1167 } 1168 1169 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1170 qid.type, qid.path, qid.version); 1171 1172 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1173 1174 p9_tag_remove(clnt, req); 1175 return fid; 1176 1177 error: 1178 if (fid) 1179 p9_fid_destroy(fid); 1180 return ERR_PTR(err); 1181 } 1182 EXPORT_SYMBOL(p9_client_attach); 1183 1184 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1185 const unsigned char * const *wnames, int clone) 1186 { 1187 int err; 1188 struct p9_client *clnt; 1189 struct p9_fid *fid; 1190 struct p9_qid *wqids; 1191 struct p9_req_t *req; 1192 u16 nwqids, count; 1193 1194 err = 0; 1195 wqids = NULL; 1196 clnt = oldfid->clnt; 1197 if (clone) { 1198 fid = p9_fid_create(clnt); 1199 if (!fid) { 1200 err = -ENOMEM; 1201 goto error; 1202 } 1203 1204 fid->uid = oldfid->uid; 1205 } else { 1206 fid = oldfid; 1207 } 1208 1209 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1210 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1211 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1212 nwname, wnames); 1213 if (IS_ERR(req)) { 1214 err = PTR_ERR(req); 1215 goto error; 1216 } 1217 1218 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1219 if (err) { 1220 trace_9p_protocol_dump(clnt, &req->rc); 1221 p9_tag_remove(clnt, req); 1222 goto clunk_fid; 1223 } 1224 p9_tag_remove(clnt, req); 1225 1226 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1227 1228 if (nwqids != nwname) { 1229 err = -ENOENT; 1230 goto clunk_fid; 1231 } 1232 1233 for (count = 0; count < nwqids; count++) 1234 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1235 count, wqids[count].type, 1236 wqids[count].path, 1237 wqids[count].version); 1238 1239 if (nwname) 1240 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1241 else 1242 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); 1243 1244 kfree(wqids); 1245 return fid; 1246 1247 clunk_fid: 1248 kfree(wqids); 1249 p9_fid_put(fid); 1250 fid = NULL; 1251 1252 error: 1253 if (fid && fid != oldfid) 1254 p9_fid_destroy(fid); 1255 1256 return ERR_PTR(err); 1257 } 1258 EXPORT_SYMBOL(p9_client_walk); 1259 1260 int p9_client_open(struct p9_fid *fid, int mode) 1261 { 1262 int err; 1263 struct p9_client *clnt; 1264 struct p9_req_t *req; 1265 struct p9_qid qid; 1266 int iounit; 1267 1268 clnt = fid->clnt; 1269 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1270 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1271 err = 0; 1272 1273 if (fid->mode != -1) 1274 return -EINVAL; 1275 1276 if (p9_is_proto_dotl(clnt)) 1277 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1278 else 1279 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1280 if (IS_ERR(req)) { 1281 err = PTR_ERR(req); 1282 goto error; 1283 } 1284 1285 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1286 if (err) { 1287 trace_9p_protocol_dump(clnt, &req->rc); 1288 goto free_and_error; 1289 } 1290 1291 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1292 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1293 qid.path, qid.version, iounit); 1294 1295 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1296 fid->mode = mode; 1297 fid->iounit = iounit; 1298 1299 free_and_error: 1300 p9_tag_remove(clnt, req); 1301 error: 1302 return err; 1303 } 1304 EXPORT_SYMBOL(p9_client_open); 1305 1306 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, 1307 u32 mode, kgid_t gid, struct p9_qid *qid) 1308 { 1309 int err = 0; 1310 struct p9_client *clnt; 1311 struct p9_req_t *req; 1312 int iounit; 1313 1314 p9_debug(P9_DEBUG_9P, 1315 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1316 ofid->fid, name, flags, mode, 1317 from_kgid(&init_user_ns, gid)); 1318 clnt = ofid->clnt; 1319 1320 if (ofid->mode != -1) 1321 return -EINVAL; 1322 1323 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1324 mode, gid); 1325 if (IS_ERR(req)) { 1326 err = PTR_ERR(req); 1327 goto error; 1328 } 1329 1330 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); 1331 if (err) { 1332 trace_9p_protocol_dump(clnt, &req->rc); 1333 goto free_and_error; 1334 } 1335 1336 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1337 qid->type, qid->path, qid->version, iounit); 1338 1339 memmove(&ofid->qid, qid, sizeof(struct p9_qid)); 1340 ofid->mode = mode; 1341 ofid->iounit = iounit; 1342 1343 free_and_error: 1344 p9_tag_remove(clnt, req); 1345 error: 1346 return err; 1347 } 1348 EXPORT_SYMBOL(p9_client_create_dotl); 1349 1350 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1351 char *extension) 1352 { 1353 int err; 1354 struct p9_client *clnt; 1355 struct p9_req_t *req; 1356 struct p9_qid qid; 1357 int iounit; 1358 1359 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1360 fid->fid, name, perm, mode); 1361 err = 0; 1362 clnt = fid->clnt; 1363 1364 if (fid->mode != -1) 1365 return -EINVAL; 1366 1367 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1368 mode, extension); 1369 if (IS_ERR(req)) { 1370 err = PTR_ERR(req); 1371 goto error; 1372 } 1373 1374 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1375 if (err) { 1376 trace_9p_protocol_dump(clnt, &req->rc); 1377 goto free_and_error; 1378 } 1379 1380 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1381 qid.type, qid.path, qid.version, iounit); 1382 1383 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1384 fid->mode = mode; 1385 fid->iounit = iounit; 1386 1387 free_and_error: 1388 p9_tag_remove(clnt, req); 1389 error: 1390 return err; 1391 } 1392 EXPORT_SYMBOL(p9_client_fcreate); 1393 1394 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1395 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1396 { 1397 int err = 0; 1398 struct p9_client *clnt; 1399 struct p9_req_t *req; 1400 1401 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1402 dfid->fid, name, symtgt); 1403 clnt = dfid->clnt; 1404 1405 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1406 gid); 1407 if (IS_ERR(req)) { 1408 err = PTR_ERR(req); 1409 goto error; 1410 } 1411 1412 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 1413 if (err) { 1414 trace_9p_protocol_dump(clnt, &req->rc); 1415 goto free_and_error; 1416 } 1417 1418 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1419 qid->type, qid->path, qid->version); 1420 1421 free_and_error: 1422 p9_tag_remove(clnt, req); 1423 error: 1424 return err; 1425 } 1426 EXPORT_SYMBOL(p9_client_symlink); 1427 1428 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1429 { 1430 struct p9_client *clnt; 1431 struct p9_req_t *req; 1432 1433 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1434 dfid->fid, oldfid->fid, newname); 1435 clnt = dfid->clnt; 1436 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1437 newname); 1438 if (IS_ERR(req)) 1439 return PTR_ERR(req); 1440 1441 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1442 p9_tag_remove(clnt, req); 1443 return 0; 1444 } 1445 EXPORT_SYMBOL(p9_client_link); 1446 1447 int p9_client_fsync(struct p9_fid *fid, int datasync) 1448 { 1449 int err; 1450 struct p9_client *clnt; 1451 struct p9_req_t *req; 1452 1453 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1454 fid->fid, datasync); 1455 err = 0; 1456 clnt = fid->clnt; 1457 1458 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1459 if (IS_ERR(req)) { 1460 err = PTR_ERR(req); 1461 goto error; 1462 } 1463 1464 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1465 1466 p9_tag_remove(clnt, req); 1467 1468 error: 1469 return err; 1470 } 1471 EXPORT_SYMBOL(p9_client_fsync); 1472 1473 int p9_client_clunk(struct p9_fid *fid) 1474 { 1475 int err; 1476 struct p9_client *clnt; 1477 struct p9_req_t *req; 1478 int retries = 0; 1479 1480 again: 1481 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", 1482 fid->fid, retries); 1483 err = 0; 1484 clnt = fid->clnt; 1485 1486 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1487 if (IS_ERR(req)) { 1488 err = PTR_ERR(req); 1489 goto error; 1490 } 1491 1492 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1493 1494 p9_tag_remove(clnt, req); 1495 error: 1496 /* Fid is not valid even after a failed clunk 1497 * If interrupted, retry once then give up and 1498 * leak fid until umount. 1499 */ 1500 if (err == -ERESTARTSYS) { 1501 if (retries++ == 0) 1502 goto again; 1503 } else { 1504 p9_fid_destroy(fid); 1505 } 1506 return err; 1507 } 1508 EXPORT_SYMBOL(p9_client_clunk); 1509 1510 int p9_client_remove(struct p9_fid *fid) 1511 { 1512 int err; 1513 struct p9_client *clnt; 1514 struct p9_req_t *req; 1515 1516 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1517 err = 0; 1518 clnt = fid->clnt; 1519 1520 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1521 if (IS_ERR(req)) { 1522 err = PTR_ERR(req); 1523 goto error; 1524 } 1525 1526 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1527 1528 p9_tag_remove(clnt, req); 1529 error: 1530 if (err == -ERESTARTSYS) 1531 p9_fid_put(fid); 1532 else 1533 p9_fid_destroy(fid); 1534 return err; 1535 } 1536 EXPORT_SYMBOL(p9_client_remove); 1537 1538 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1539 { 1540 int err = 0; 1541 struct p9_req_t *req; 1542 struct p9_client *clnt; 1543 1544 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1545 dfid->fid, name, flags); 1546 1547 clnt = dfid->clnt; 1548 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1549 if (IS_ERR(req)) { 1550 err = PTR_ERR(req); 1551 goto error; 1552 } 1553 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1554 1555 p9_tag_remove(clnt, req); 1556 error: 1557 return err; 1558 } 1559 EXPORT_SYMBOL(p9_client_unlinkat); 1560 1561 int 1562 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1563 { 1564 int total = 0; 1565 *err = 0; 1566 1567 while (iov_iter_count(to)) { 1568 int count; 1569 1570 count = p9_client_read_once(fid, offset, to, err); 1571 if (!count || *err) 1572 break; 1573 offset += count; 1574 total += count; 1575 } 1576 return total; 1577 } 1578 EXPORT_SYMBOL(p9_client_read); 1579 1580 int 1581 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, 1582 int *err) 1583 { 1584 struct p9_client *clnt = fid->clnt; 1585 struct p9_req_t *req; 1586 int count = iov_iter_count(to); 1587 int rsize, non_zc = 0; 1588 char *dataptr; 1589 1590 *err = 0; 1591 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n", 1592 fid->fid, offset, iov_iter_count(to)); 1593 1594 rsize = fid->iounit; 1595 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1596 rsize = clnt->msize - P9_IOHDRSZ; 1597 1598 if (count < rsize) 1599 rsize = count; 1600 1601 /* Don't bother zerocopy for small IO (< 1024) */ 1602 if (clnt->trans_mod->zc_request && rsize > 1024) { 1603 /* response header len is 11 1604 * PDU Header(7) + IO Size (4) 1605 */ 1606 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1607 0, 11, "dqd", fid->fid, 1608 offset, rsize); 1609 } else { 1610 non_zc = 1; 1611 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1612 rsize); 1613 } 1614 if (IS_ERR(req)) { 1615 *err = PTR_ERR(req); 1616 return 0; 1617 } 1618 1619 *err = p9pdu_readf(&req->rc, clnt->proto_version, 1620 "D", &count, &dataptr); 1621 if (*err) { 1622 trace_9p_protocol_dump(clnt, &req->rc); 1623 p9_tag_remove(clnt, req); 1624 return 0; 1625 } 1626 if (rsize < count) { 1627 pr_err("bogus RREAD count (%d > %d)\n", count, rsize); 1628 count = rsize; 1629 } 1630 1631 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1632 1633 if (non_zc) { 1634 int n = copy_to_iter(dataptr, count, to); 1635 1636 if (n != count) { 1637 *err = -EFAULT; 1638 p9_tag_remove(clnt, req); 1639 return n; 1640 } 1641 } else { 1642 iov_iter_advance(to, count); 1643 } 1644 p9_tag_remove(clnt, req); 1645 return count; 1646 } 1647 EXPORT_SYMBOL(p9_client_read_once); 1648 1649 int 1650 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1651 { 1652 struct p9_client *clnt = fid->clnt; 1653 struct p9_req_t *req; 1654 int total = 0; 1655 *err = 0; 1656 1657 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", 1658 fid->fid, offset, iov_iter_count(from)); 1659 1660 while (iov_iter_count(from)) { 1661 int count = iov_iter_count(from); 1662 int rsize = fid->iounit; 1663 1664 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1665 rsize = clnt->msize - P9_IOHDRSZ; 1666 1667 if (count < rsize) 1668 rsize = count; 1669 1670 /* Don't bother zerocopy for small IO (< 1024) */ 1671 if (clnt->trans_mod->zc_request && rsize > 1024) { 1672 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1673 rsize, P9_ZC_HDR_SZ, "dqd", 1674 fid->fid, offset, rsize); 1675 } else { 1676 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1677 offset, rsize, from); 1678 } 1679 if (IS_ERR(req)) { 1680 *err = PTR_ERR(req); 1681 break; 1682 } 1683 1684 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count); 1685 if (*err) { 1686 trace_9p_protocol_dump(clnt, &req->rc); 1687 p9_tag_remove(clnt, req); 1688 break; 1689 } 1690 if (rsize < count) { 1691 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize); 1692 count = rsize; 1693 } 1694 1695 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1696 1697 p9_tag_remove(clnt, req); 1698 iov_iter_advance(from, count); 1699 total += count; 1700 offset += count; 1701 } 1702 return total; 1703 } 1704 EXPORT_SYMBOL(p9_client_write); 1705 1706 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1707 { 1708 int err; 1709 struct p9_client *clnt; 1710 struct p9_wstat *ret; 1711 struct p9_req_t *req; 1712 u16 ignored; 1713 1714 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1715 1716 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1717 if (!ret) 1718 return ERR_PTR(-ENOMEM); 1719 1720 err = 0; 1721 clnt = fid->clnt; 1722 1723 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1724 if (IS_ERR(req)) { 1725 err = PTR_ERR(req); 1726 goto error; 1727 } 1728 1729 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); 1730 if (err) { 1731 trace_9p_protocol_dump(clnt, &req->rc); 1732 p9_tag_remove(clnt, req); 1733 goto error; 1734 } 1735 1736 p9_debug(P9_DEBUG_9P, 1737 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1738 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1739 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1740 "<<< uid=%d gid=%d n_muid=%d\n", 1741 ret->size, ret->type, ret->dev, ret->qid.type, ret->qid.path, 1742 ret->qid.version, ret->mode, 1743 ret->atime, ret->mtime, ret->length, 1744 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1745 from_kuid(&init_user_ns, ret->n_uid), 1746 from_kgid(&init_user_ns, ret->n_gid), 1747 from_kuid(&init_user_ns, ret->n_muid)); 1748 1749 p9_tag_remove(clnt, req); 1750 return ret; 1751 1752 error: 1753 kfree(ret); 1754 return ERR_PTR(err); 1755 } 1756 EXPORT_SYMBOL(p9_client_stat); 1757 1758 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1759 u64 request_mask) 1760 { 1761 int err; 1762 struct p9_client *clnt; 1763 struct p9_stat_dotl *ret; 1764 struct p9_req_t *req; 1765 1766 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1767 fid->fid, request_mask); 1768 1769 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1770 if (!ret) 1771 return ERR_PTR(-ENOMEM); 1772 1773 err = 0; 1774 clnt = fid->clnt; 1775 1776 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1777 if (IS_ERR(req)) { 1778 err = PTR_ERR(req); 1779 goto error; 1780 } 1781 1782 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); 1783 if (err) { 1784 trace_9p_protocol_dump(clnt, &req->rc); 1785 p9_tag_remove(clnt, req); 1786 goto error; 1787 } 1788 1789 p9_debug(P9_DEBUG_9P, "<<< RGETATTR st_result_mask=%lld\n" 1790 "<<< qid=%x.%llx.%x\n" 1791 "<<< st_mode=%8.8x st_nlink=%llu\n" 1792 "<<< st_uid=%d st_gid=%d\n" 1793 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1794 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1795 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1796 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1797 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1798 "<<< st_gen=%lld st_data_version=%lld\n", 1799 ret->st_result_mask, 1800 ret->qid.type, ret->qid.path, ret->qid.version, 1801 ret->st_mode, ret->st_nlink, 1802 from_kuid(&init_user_ns, ret->st_uid), 1803 from_kgid(&init_user_ns, ret->st_gid), 1804 ret->st_rdev, ret->st_size, ret->st_blksize, ret->st_blocks, 1805 ret->st_atime_sec, ret->st_atime_nsec, 1806 ret->st_mtime_sec, ret->st_mtime_nsec, 1807 ret->st_ctime_sec, ret->st_ctime_nsec, 1808 ret->st_btime_sec, ret->st_btime_nsec, 1809 ret->st_gen, ret->st_data_version); 1810 1811 p9_tag_remove(clnt, req); 1812 return ret; 1813 1814 error: 1815 kfree(ret); 1816 return ERR_PTR(err); 1817 } 1818 EXPORT_SYMBOL(p9_client_getattr_dotl); 1819 1820 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1821 { 1822 int ret; 1823 1824 /* NOTE: size shouldn't include its own length */ 1825 /* size[2] type[2] dev[4] qid[13] */ 1826 /* mode[4] atime[4] mtime[4] length[8]*/ 1827 /* name[s] uid[s] gid[s] muid[s] */ 1828 ret = 2 + 4 + 13 + 4 + 4 + 4 + 8 + 2 + 2 + 2 + 2; 1829 1830 if (wst->name) 1831 ret += strlen(wst->name); 1832 if (wst->uid) 1833 ret += strlen(wst->uid); 1834 if (wst->gid) 1835 ret += strlen(wst->gid); 1836 if (wst->muid) 1837 ret += strlen(wst->muid); 1838 1839 if (proto_version == p9_proto_2000u || 1840 proto_version == p9_proto_2000L) { 1841 /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1842 ret += 2 + 4 + 4 + 4; 1843 if (wst->extension) 1844 ret += strlen(wst->extension); 1845 } 1846 1847 return ret; 1848 } 1849 1850 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1851 { 1852 int err; 1853 struct p9_req_t *req; 1854 struct p9_client *clnt; 1855 1856 err = 0; 1857 clnt = fid->clnt; 1858 wst->size = p9_client_statsize(wst, clnt->proto_version); 1859 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", 1860 fid->fid); 1861 p9_debug(P9_DEBUG_9P, 1862 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1863 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1864 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1865 " uid=%d gid=%d n_muid=%d\n", 1866 wst->size, wst->type, wst->dev, wst->qid.type, 1867 wst->qid.path, wst->qid.version, 1868 wst->mode, wst->atime, wst->mtime, wst->length, 1869 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1870 from_kuid(&init_user_ns, wst->n_uid), 1871 from_kgid(&init_user_ns, wst->n_gid), 1872 from_kuid(&init_user_ns, wst->n_muid)); 1873 1874 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", 1875 fid->fid, wst->size + 2, wst); 1876 if (IS_ERR(req)) { 1877 err = PTR_ERR(req); 1878 goto error; 1879 } 1880 1881 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1882 1883 p9_tag_remove(clnt, req); 1884 error: 1885 return err; 1886 } 1887 EXPORT_SYMBOL(p9_client_wstat); 1888 1889 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1890 { 1891 int err; 1892 struct p9_req_t *req; 1893 struct p9_client *clnt; 1894 1895 err = 0; 1896 clnt = fid->clnt; 1897 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1898 p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n", 1899 p9attr->valid, p9attr->mode, 1900 from_kuid(&init_user_ns, p9attr->uid), 1901 from_kgid(&init_user_ns, p9attr->gid), 1902 p9attr->size); 1903 p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n", 1904 p9attr->atime_sec, p9attr->atime_nsec); 1905 p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n", 1906 p9attr->mtime_sec, p9attr->mtime_nsec); 1907 1908 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1909 1910 if (IS_ERR(req)) { 1911 err = PTR_ERR(req); 1912 goto error; 1913 } 1914 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1915 p9_tag_remove(clnt, req); 1916 error: 1917 return err; 1918 } 1919 EXPORT_SYMBOL(p9_client_setattr); 1920 1921 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1922 { 1923 int err; 1924 struct p9_req_t *req; 1925 struct p9_client *clnt; 1926 1927 err = 0; 1928 clnt = fid->clnt; 1929 1930 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1931 1932 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1933 if (IS_ERR(req)) { 1934 err = PTR_ERR(req); 1935 goto error; 1936 } 1937 1938 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1939 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1940 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1941 if (err) { 1942 trace_9p_protocol_dump(clnt, &req->rc); 1943 p9_tag_remove(clnt, req); 1944 goto error; 1945 } 1946 1947 p9_debug(P9_DEBUG_9P, 1948 "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n", 1949 fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree, 1950 sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen); 1951 1952 p9_tag_remove(clnt, req); 1953 error: 1954 return err; 1955 } 1956 EXPORT_SYMBOL(p9_client_statfs); 1957 1958 int p9_client_rename(struct p9_fid *fid, 1959 struct p9_fid *newdirfid, const char *name) 1960 { 1961 int err; 1962 struct p9_req_t *req; 1963 struct p9_client *clnt; 1964 1965 err = 0; 1966 clnt = fid->clnt; 1967 1968 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1969 fid->fid, newdirfid->fid, name); 1970 1971 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1972 newdirfid->fid, name); 1973 if (IS_ERR(req)) { 1974 err = PTR_ERR(req); 1975 goto error; 1976 } 1977 1978 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1979 1980 p9_tag_remove(clnt, req); 1981 error: 1982 return err; 1983 } 1984 EXPORT_SYMBOL(p9_client_rename); 1985 1986 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1987 struct p9_fid *newdirfid, const char *new_name) 1988 { 1989 int err; 1990 struct p9_req_t *req; 1991 struct p9_client *clnt; 1992 1993 err = 0; 1994 clnt = olddirfid->clnt; 1995 1996 p9_debug(P9_DEBUG_9P, 1997 ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n", 1998 olddirfid->fid, old_name, newdirfid->fid, new_name); 1999 2000 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 2001 old_name, newdirfid->fid, new_name); 2002 if (IS_ERR(req)) { 2003 err = PTR_ERR(req); 2004 goto error; 2005 } 2006 2007 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 2008 newdirfid->fid, new_name); 2009 2010 p9_tag_remove(clnt, req); 2011 error: 2012 return err; 2013 } 2014 EXPORT_SYMBOL(p9_client_renameat); 2015 2016 /* An xattrwalk without @attr_name gives the fid for the lisxattr namespace 2017 */ 2018 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 2019 const char *attr_name, u64 *attr_size) 2020 { 2021 int err; 2022 struct p9_req_t *req; 2023 struct p9_client *clnt; 2024 struct p9_fid *attr_fid; 2025 2026 err = 0; 2027 clnt = file_fid->clnt; 2028 attr_fid = p9_fid_create(clnt); 2029 if (!attr_fid) { 2030 err = -ENOMEM; 2031 goto error; 2032 } 2033 p9_debug(P9_DEBUG_9P, 2034 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 2035 file_fid->fid, attr_fid->fid, attr_name); 2036 2037 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 2038 file_fid->fid, attr_fid->fid, attr_name); 2039 if (IS_ERR(req)) { 2040 err = PTR_ERR(req); 2041 goto error; 2042 } 2043 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); 2044 if (err) { 2045 trace_9p_protocol_dump(clnt, &req->rc); 2046 p9_tag_remove(clnt, req); 2047 goto clunk_fid; 2048 } 2049 p9_tag_remove(clnt, req); 2050 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2051 attr_fid->fid, *attr_size); 2052 return attr_fid; 2053 clunk_fid: 2054 p9_fid_put(attr_fid); 2055 attr_fid = NULL; 2056 error: 2057 if (attr_fid && attr_fid != file_fid) 2058 p9_fid_destroy(attr_fid); 2059 2060 return ERR_PTR(err); 2061 } 2062 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2063 2064 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2065 u64 attr_size, int flags) 2066 { 2067 int err; 2068 struct p9_req_t *req; 2069 struct p9_client *clnt; 2070 2071 p9_debug(P9_DEBUG_9P, 2072 ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n", 2073 fid->fid, name, attr_size, flags); 2074 err = 0; 2075 clnt = fid->clnt; 2076 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2077 fid->fid, name, attr_size, flags); 2078 if (IS_ERR(req)) { 2079 err = PTR_ERR(req); 2080 goto error; 2081 } 2082 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2083 p9_tag_remove(clnt, req); 2084 error: 2085 return err; 2086 } 2087 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2088 2089 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2090 { 2091 int err, rsize, non_zc = 0; 2092 struct p9_client *clnt; 2093 struct p9_req_t *req; 2094 char *dataptr; 2095 struct kvec kv = {.iov_base = data, .iov_len = count}; 2096 struct iov_iter to; 2097 2098 iov_iter_kvec(&to, READ, &kv, 1, count); 2099 2100 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2101 fid->fid, offset, count); 2102 2103 err = 0; 2104 clnt = fid->clnt; 2105 2106 rsize = fid->iounit; 2107 if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ) 2108 rsize = clnt->msize - P9_READDIRHDRSZ; 2109 2110 if (count < rsize) 2111 rsize = count; 2112 2113 /* Don't bother zerocopy for small IO (< 1024) */ 2114 if (clnt->trans_mod->zc_request && rsize > 1024) { 2115 /* response header len is 11 2116 * PDU Header(7) + IO Size (4) 2117 */ 2118 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2119 11, "dqd", fid->fid, offset, rsize); 2120 } else { 2121 non_zc = 1; 2122 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2123 offset, rsize); 2124 } 2125 if (IS_ERR(req)) { 2126 err = PTR_ERR(req); 2127 goto error; 2128 } 2129 2130 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); 2131 if (err) { 2132 trace_9p_protocol_dump(clnt, &req->rc); 2133 goto free_and_error; 2134 } 2135 if (rsize < count) { 2136 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2137 count = rsize; 2138 } 2139 2140 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2141 2142 if (non_zc) 2143 memmove(data, dataptr, count); 2144 2145 p9_tag_remove(clnt, req); 2146 return count; 2147 2148 free_and_error: 2149 p9_tag_remove(clnt, req); 2150 error: 2151 return err; 2152 } 2153 EXPORT_SYMBOL(p9_client_readdir); 2154 2155 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2156 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2157 { 2158 int err; 2159 struct p9_client *clnt; 2160 struct p9_req_t *req; 2161 2162 err = 0; 2163 clnt = fid->clnt; 2164 p9_debug(P9_DEBUG_9P, 2165 ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n", 2166 fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2167 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2168 MAJOR(rdev), MINOR(rdev), gid); 2169 if (IS_ERR(req)) 2170 return PTR_ERR(req); 2171 2172 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2173 if (err) { 2174 trace_9p_protocol_dump(clnt, &req->rc); 2175 goto error; 2176 } 2177 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", 2178 qid->type, qid->path, qid->version); 2179 2180 error: 2181 p9_tag_remove(clnt, req); 2182 return err; 2183 } 2184 EXPORT_SYMBOL(p9_client_mknod_dotl); 2185 2186 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2187 kgid_t gid, struct p9_qid *qid) 2188 { 2189 int err; 2190 struct p9_client *clnt; 2191 struct p9_req_t *req; 2192 2193 err = 0; 2194 clnt = fid->clnt; 2195 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2196 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2197 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", 2198 fid->fid, name, mode, gid); 2199 if (IS_ERR(req)) 2200 return PTR_ERR(req); 2201 2202 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2203 if (err) { 2204 trace_9p_protocol_dump(clnt, &req->rc); 2205 goto error; 2206 } 2207 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2208 qid->path, qid->version); 2209 2210 error: 2211 p9_tag_remove(clnt, req); 2212 return err; 2213 } 2214 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2215 2216 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2217 { 2218 int err; 2219 struct p9_client *clnt; 2220 struct p9_req_t *req; 2221 2222 err = 0; 2223 clnt = fid->clnt; 2224 p9_debug(P9_DEBUG_9P, 2225 ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n", 2226 fid->fid, flock->type, flock->flags, flock->start, 2227 flock->length, flock->proc_id, flock->client_id); 2228 2229 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2230 flock->flags, flock->start, flock->length, 2231 flock->proc_id, flock->client_id); 2232 2233 if (IS_ERR(req)) 2234 return PTR_ERR(req); 2235 2236 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); 2237 if (err) { 2238 trace_9p_protocol_dump(clnt, &req->rc); 2239 goto error; 2240 } 2241 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2242 error: 2243 p9_tag_remove(clnt, req); 2244 return err; 2245 } 2246 EXPORT_SYMBOL(p9_client_lock_dotl); 2247 2248 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2249 { 2250 int err; 2251 struct p9_client *clnt; 2252 struct p9_req_t *req; 2253 2254 err = 0; 2255 clnt = fid->clnt; 2256 p9_debug(P9_DEBUG_9P, 2257 ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n", 2258 fid->fid, glock->type, glock->start, glock->length, 2259 glock->proc_id, glock->client_id); 2260 2261 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, 2262 glock->type, glock->start, glock->length, 2263 glock->proc_id, glock->client_id); 2264 2265 if (IS_ERR(req)) 2266 return PTR_ERR(req); 2267 2268 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, 2269 &glock->start, &glock->length, &glock->proc_id, 2270 &glock->client_id); 2271 if (err) { 2272 trace_9p_protocol_dump(clnt, &req->rc); 2273 goto error; 2274 } 2275 p9_debug(P9_DEBUG_9P, 2276 "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n", 2277 glock->type, glock->start, glock->length, 2278 glock->proc_id, glock->client_id); 2279 error: 2280 p9_tag_remove(clnt, req); 2281 return err; 2282 } 2283 EXPORT_SYMBOL(p9_client_getlock_dotl); 2284 2285 int p9_client_readlink(struct p9_fid *fid, char **target) 2286 { 2287 int err; 2288 struct p9_client *clnt; 2289 struct p9_req_t *req; 2290 2291 err = 0; 2292 clnt = fid->clnt; 2293 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2294 2295 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2296 if (IS_ERR(req)) 2297 return PTR_ERR(req); 2298 2299 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); 2300 if (err) { 2301 trace_9p_protocol_dump(clnt, &req->rc); 2302 goto error; 2303 } 2304 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2305 error: 2306 p9_tag_remove(clnt, req); 2307 return err; 2308 } 2309 EXPORT_SYMBOL(p9_client_readlink); 2310 2311 int __init p9_client_init(void) 2312 { 2313 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); 2314 return p9_req_cache ? 0 : -ENOMEM; 2315 } 2316 2317 void __exit p9_client_exit(void) 2318 { 2319 kmem_cache_destroy(p9_req_cache); 2320 } 2321