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