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 * @t_size: Buffer size for holding this request 259 * (automatic calculation by format template if 0). 260 * @r_size: Buffer size for holding server's reply on this request 261 * (automatic calculation by format template if 0). 262 * @fmt: Format template for assembling 9p request message 263 * (see p9pdu_vwritef). 264 * @ap: Variable arguments to be fed to passed format template 265 * (see p9pdu_vwritef). 266 * 267 * Context: Process context. 268 * Return: Pointer to new request. 269 */ 270 static struct p9_req_t * 271 p9_tag_alloc(struct p9_client *c, int8_t type, uint t_size, uint r_size, 272 const char *fmt, va_list ap) 273 { 274 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); 275 int alloc_tsize; 276 int alloc_rsize; 277 int tag; 278 va_list apc; 279 280 va_copy(apc, ap); 281 alloc_tsize = min_t(size_t, c->msize, 282 t_size ?: p9_msg_buf_size(c, type, fmt, apc)); 283 va_end(apc); 284 285 alloc_rsize = min_t(size_t, c->msize, 286 r_size ?: p9_msg_buf_size(c, type + 1, fmt, ap)); 287 288 if (!req) 289 return ERR_PTR(-ENOMEM); 290 291 if (p9_fcall_init(c, &req->tc, alloc_tsize)) 292 goto free_req; 293 if (p9_fcall_init(c, &req->rc, alloc_rsize)) 294 goto free; 295 296 p9pdu_reset(&req->tc); 297 p9pdu_reset(&req->rc); 298 req->t_err = 0; 299 req->status = REQ_STATUS_ALLOC; 300 init_waitqueue_head(&req->wq); 301 INIT_LIST_HEAD(&req->req_list); 302 303 idr_preload(GFP_NOFS); 304 spin_lock_irq(&c->lock); 305 if (type == P9_TVERSION) 306 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1, 307 GFP_NOWAIT); 308 else 309 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT); 310 req->tc.tag = tag; 311 spin_unlock_irq(&c->lock); 312 idr_preload_end(); 313 if (tag < 0) 314 goto free; 315 316 /* Init ref to two because in the general case there is one ref 317 * that is put asynchronously by a writer thread, one ref 318 * temporarily given by p9_tag_lookup and put by p9_client_cb 319 * in the recv thread, and one ref put by p9_req_put in the 320 * main thread. The only exception is virtio that does not use 321 * p9_tag_lookup but does not have a writer thread either 322 * (the write happens synchronously in the request/zc_request 323 * callback), so p9_client_cb eats the second ref there 324 * as the pointer is duplicated directly by virtqueue_add_sgs() 325 */ 326 refcount_set(&req->refcount, 2); 327 328 return req; 329 330 free: 331 p9_fcall_fini(&req->tc); 332 p9_fcall_fini(&req->rc); 333 free_req: 334 kmem_cache_free(p9_req_cache, req); 335 return ERR_PTR(-ENOMEM); 336 } 337 338 /** 339 * p9_tag_lookup - Look up a request by tag. 340 * @c: Client session. 341 * @tag: Transaction ID. 342 * 343 * Context: Any context. 344 * Return: A request, or %NULL if there is no request with that tag. 345 */ 346 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 347 { 348 struct p9_req_t *req; 349 350 rcu_read_lock(); 351 again: 352 req = idr_find(&c->reqs, tag); 353 if (req) { 354 /* We have to be careful with the req found under rcu_read_lock 355 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the 356 * ref again without corrupting other data, then check again 357 * that the tag matches once we have the ref 358 */ 359 if (!p9_req_try_get(req)) 360 goto again; 361 if (req->tc.tag != tag) { 362 p9_req_put(c, req); 363 goto again; 364 } 365 } 366 rcu_read_unlock(); 367 368 return req; 369 } 370 EXPORT_SYMBOL(p9_tag_lookup); 371 372 /** 373 * p9_tag_remove - Remove a tag. 374 * @c: Client session. 375 * @r: Request of reference. 376 * 377 * Context: Any context. 378 */ 379 static void p9_tag_remove(struct p9_client *c, struct p9_req_t *r) 380 { 381 unsigned long flags; 382 u16 tag = r->tc.tag; 383 384 p9_debug(P9_DEBUG_MUX, "freeing clnt %p req %p tag: %d\n", c, r, tag); 385 spin_lock_irqsave(&c->lock, flags); 386 idr_remove(&c->reqs, tag); 387 spin_unlock_irqrestore(&c->lock, flags); 388 } 389 390 int p9_req_put(struct p9_client *c, struct p9_req_t *r) 391 { 392 if (refcount_dec_and_test(&r->refcount)) { 393 p9_tag_remove(c, r); 394 395 p9_fcall_fini(&r->tc); 396 p9_fcall_fini(&r->rc); 397 kmem_cache_free(p9_req_cache, r); 398 return 1; 399 } 400 return 0; 401 } 402 EXPORT_SYMBOL(p9_req_put); 403 404 /** 405 * p9_tag_cleanup - cleans up tags structure and reclaims resources 406 * @c: v9fs client struct 407 * 408 * This frees resources associated with the tags structure 409 * 410 */ 411 static void p9_tag_cleanup(struct p9_client *c) 412 { 413 struct p9_req_t *req; 414 int id; 415 416 rcu_read_lock(); 417 idr_for_each_entry(&c->reqs, req, id) { 418 pr_info("Tag %d still in use\n", id); 419 if (p9_req_put(c, req) == 0) 420 pr_warn("Packet with tag %d has still references", 421 req->tc.tag); 422 } 423 rcu_read_unlock(); 424 } 425 426 /** 427 * p9_client_cb - call back from transport to client 428 * @c: client state 429 * @req: request received 430 * @status: request status, one of REQ_STATUS_* 431 * 432 */ 433 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) 434 { 435 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); 436 437 /* This barrier is needed to make sure any change made to req before 438 * the status change is visible to another thread 439 */ 440 smp_wmb(); 441 req->status = status; 442 443 wake_up(&req->wq); 444 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); 445 p9_req_put(c, req); 446 } 447 EXPORT_SYMBOL(p9_client_cb); 448 449 /** 450 * p9_parse_header - parse header arguments out of a packet 451 * @pdu: packet to parse 452 * @size: size of packet 453 * @type: type of request 454 * @tag: tag of packet 455 * @rewind: set if we need to rewind offset afterwards 456 */ 457 458 int 459 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, 460 int16_t *tag, int rewind) 461 { 462 s8 r_type; 463 s16 r_tag; 464 s32 r_size; 465 int offset = pdu->offset; 466 int err; 467 468 pdu->offset = 0; 469 470 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 471 if (err) 472 goto rewind_and_exit; 473 474 if (type) 475 *type = r_type; 476 if (tag) 477 *tag = r_tag; 478 if (size) 479 *size = r_size; 480 481 if (pdu->size != r_size || r_size < 7) { 482 err = -EINVAL; 483 goto rewind_and_exit; 484 } 485 486 pdu->id = r_type; 487 pdu->tag = r_tag; 488 489 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 490 pdu->size, pdu->id, pdu->tag); 491 492 rewind_and_exit: 493 if (rewind) 494 pdu->offset = offset; 495 return err; 496 } 497 EXPORT_SYMBOL(p9_parse_header); 498 499 /** 500 * p9_check_errors - check 9p packet for error return and process it 501 * @c: current client instance 502 * @req: request to parse and check for error conditions 503 * 504 * returns error code if one is discovered, otherwise returns 0 505 * 506 * this will have to be more complicated if we have multiple 507 * error packet types 508 */ 509 510 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 511 { 512 s8 type; 513 int err; 514 int ecode; 515 516 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 517 if (req->rc.size >= c->msize) { 518 p9_debug(P9_DEBUG_ERROR, 519 "requested packet size too big: %d\n", 520 req->rc.size); 521 return -EIO; 522 } 523 /* dump the response from server 524 * This should be after check errors which poplulate pdu_fcall. 525 */ 526 trace_9p_protocol_dump(c, &req->rc); 527 if (err) { 528 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 529 return err; 530 } 531 if (type != P9_RERROR && type != P9_RLERROR) 532 return 0; 533 534 if (!p9_is_proto_dotl(c)) { 535 char *ename; 536 537 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 538 &ename, &ecode); 539 if (err) 540 goto out_err; 541 542 if (p9_is_proto_dotu(c) && ecode < 512) 543 err = -ecode; 544 545 if (!err) { 546 err = p9_errstr2errno(ename, strlen(ename)); 547 548 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 549 -ecode, ename); 550 } 551 kfree(ename); 552 } else { 553 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 554 if (err) 555 goto out_err; 556 err = -ecode; 557 558 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 559 } 560 561 return err; 562 563 out_err: 564 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 565 566 return err; 567 } 568 569 static struct p9_req_t * 570 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 571 572 /** 573 * p9_client_flush - flush (cancel) a request 574 * @c: client state 575 * @oldreq: request to cancel 576 * 577 * This sents a flush for a particular request and links 578 * the flush request to the original request. The current 579 * code only supports a single flush request although the protocol 580 * allows for multiple flush requests to be sent for a single request. 581 * 582 */ 583 584 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 585 { 586 struct p9_req_t *req; 587 s16 oldtag; 588 int err; 589 590 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); 591 if (err) 592 return err; 593 594 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 595 596 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 597 if (IS_ERR(req)) 598 return PTR_ERR(req); 599 600 /* if we haven't received a response for oldreq, 601 * remove it from the list 602 */ 603 if (oldreq->status == REQ_STATUS_SENT) { 604 if (c->trans_mod->cancelled) 605 c->trans_mod->cancelled(c, oldreq); 606 } 607 608 p9_req_put(c, req); 609 return 0; 610 } 611 612 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 613 int8_t type, uint t_size, uint r_size, 614 const char *fmt, va_list ap) 615 { 616 int err; 617 struct p9_req_t *req; 618 va_list apc; 619 620 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 621 622 /* we allow for any status other than disconnected */ 623 if (c->status == Disconnected) 624 return ERR_PTR(-EIO); 625 626 /* if status is begin_disconnected we allow only clunk request */ 627 if (c->status == BeginDisconnect && type != P9_TCLUNK) 628 return ERR_PTR(-EIO); 629 630 va_copy(apc, ap); 631 req = p9_tag_alloc(c, type, t_size, r_size, fmt, apc); 632 va_end(apc); 633 if (IS_ERR(req)) 634 return req; 635 636 /* marshall the data */ 637 p9pdu_prepare(&req->tc, req->tc.tag, type); 638 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); 639 if (err) 640 goto reterr; 641 p9pdu_finalize(c, &req->tc); 642 trace_9p_client_req(c, type, req->tc.tag); 643 return req; 644 reterr: 645 p9_req_put(c, req); 646 /* We have to put also the 2nd reference as it won't be used */ 647 p9_req_put(c, req); 648 return ERR_PTR(err); 649 } 650 651 /** 652 * p9_client_rpc - issue a request and wait for a response 653 * @c: client session 654 * @type: type of request 655 * @fmt: protocol format string (see protocol.c) 656 * 657 * Returns request structure (which client must free using p9_req_put) 658 */ 659 660 static struct p9_req_t * 661 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 662 { 663 va_list ap; 664 int sigpending, err; 665 unsigned long flags; 666 struct p9_req_t *req; 667 /* Passing zero for tsize/rsize to p9_client_prepare_req() tells it to 668 * auto determine an appropriate (small) request/response size 669 * according to actual message data being sent. Currently RDMA 670 * transport is excluded from this response message size optimization, 671 * as it would not cope with it, due to its pooled response buffers 672 * (using an optimized request size for RDMA as well though). 673 */ 674 const uint tsize = 0; 675 const uint rsize = c->trans_mod->pooled_rbuffers ? c->msize : 0; 676 677 va_start(ap, fmt); 678 req = p9_client_prepare_req(c, type, tsize, rsize, fmt, ap); 679 va_end(ap); 680 if (IS_ERR(req)) 681 return req; 682 683 if (signal_pending(current)) { 684 sigpending = 1; 685 clear_thread_flag(TIF_SIGPENDING); 686 } else { 687 sigpending = 0; 688 } 689 690 err = c->trans_mod->request(c, req); 691 if (err < 0) { 692 /* write won't happen */ 693 p9_req_put(c, req); 694 if (err != -ERESTARTSYS && err != -EFAULT) 695 c->status = Disconnected; 696 goto recalc_sigpending; 697 } 698 again: 699 /* Wait for the response */ 700 err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD); 701 702 /* Make sure our req is coherent with regard to updates in other 703 * threads - echoes to wmb() in the callback 704 */ 705 smp_rmb(); 706 707 if (err == -ERESTARTSYS && c->status == Connected && 708 type == P9_TFLUSH) { 709 sigpending = 1; 710 clear_thread_flag(TIF_SIGPENDING); 711 goto again; 712 } 713 714 if (req->status == REQ_STATUS_ERROR) { 715 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 716 err = req->t_err; 717 } 718 if (err == -ERESTARTSYS && c->status == Connected) { 719 p9_debug(P9_DEBUG_MUX, "flushing\n"); 720 sigpending = 1; 721 clear_thread_flag(TIF_SIGPENDING); 722 723 if (c->trans_mod->cancel(c, req)) 724 p9_client_flush(c, req); 725 726 /* if we received the response anyway, don't signal error */ 727 if (req->status == REQ_STATUS_RCVD) 728 err = 0; 729 } 730 recalc_sigpending: 731 if (sigpending) { 732 spin_lock_irqsave(¤t->sighand->siglock, flags); 733 recalc_sigpending(); 734 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 735 } 736 if (err < 0) 737 goto reterr; 738 739 err = p9_check_errors(c, req); 740 trace_9p_client_res(c, type, req->rc.tag, err); 741 if (!err) 742 return req; 743 reterr: 744 p9_req_put(c, req); 745 return ERR_PTR(safe_errno(err)); 746 } 747 748 /** 749 * p9_client_zc_rpc - issue a request and wait for a response 750 * @c: client session 751 * @type: type of request 752 * @uidata: destination for zero copy read 753 * @uodata: source for zero copy write 754 * @inlen: read buffer size 755 * @olen: write buffer size 756 * @in_hdrlen: reader header size, This is the size of response protocol data 757 * @fmt: protocol format string (see protocol.c) 758 * 759 * Returns request structure (which client must free using p9_req_put) 760 */ 761 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 762 struct iov_iter *uidata, 763 struct iov_iter *uodata, 764 int inlen, int olen, int in_hdrlen, 765 const char *fmt, ...) 766 { 767 va_list ap; 768 int sigpending, err; 769 unsigned long flags; 770 struct p9_req_t *req; 771 772 va_start(ap, fmt); 773 /* We allocate a inline protocol data of only 4k bytes. 774 * The actual content is passed in zero-copy fashion. 775 */ 776 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, P9_ZC_HDR_SZ, fmt, ap); 777 va_end(ap); 778 if (IS_ERR(req)) 779 return req; 780 781 if (signal_pending(current)) { 782 sigpending = 1; 783 clear_thread_flag(TIF_SIGPENDING); 784 } else { 785 sigpending = 0; 786 } 787 788 err = c->trans_mod->zc_request(c, req, uidata, uodata, 789 inlen, olen, in_hdrlen); 790 if (err < 0) { 791 if (err == -EIO) 792 c->status = Disconnected; 793 if (err != -ERESTARTSYS) 794 goto recalc_sigpending; 795 } 796 if (req->status == REQ_STATUS_ERROR) { 797 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 798 err = req->t_err; 799 } 800 if (err == -ERESTARTSYS && c->status == Connected) { 801 p9_debug(P9_DEBUG_MUX, "flushing\n"); 802 sigpending = 1; 803 clear_thread_flag(TIF_SIGPENDING); 804 805 if (c->trans_mod->cancel(c, req)) 806 p9_client_flush(c, req); 807 808 /* if we received the response anyway, don't signal error */ 809 if (req->status == REQ_STATUS_RCVD) 810 err = 0; 811 } 812 recalc_sigpending: 813 if (sigpending) { 814 spin_lock_irqsave(¤t->sighand->siglock, flags); 815 recalc_sigpending(); 816 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 817 } 818 if (err < 0) 819 goto reterr; 820 821 err = p9_check_errors(c, req); 822 trace_9p_client_res(c, type, req->rc.tag, err); 823 if (!err) 824 return req; 825 reterr: 826 p9_req_put(c, req); 827 return ERR_PTR(safe_errno(err)); 828 } 829 830 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 831 { 832 int ret; 833 struct p9_fid *fid; 834 835 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 836 fid = kzalloc(sizeof(*fid), GFP_KERNEL); 837 if (!fid) 838 return NULL; 839 840 fid->mode = -1; 841 fid->uid = current_fsuid(); 842 fid->clnt = clnt; 843 refcount_set(&fid->count, 1); 844 845 idr_preload(GFP_KERNEL); 846 spin_lock_irq(&clnt->lock); 847 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, 848 GFP_NOWAIT); 849 spin_unlock_irq(&clnt->lock); 850 idr_preload_end(); 851 if (!ret) { 852 trace_9p_fid_ref(fid, P9_FID_REF_CREATE); 853 return fid; 854 } 855 856 kfree(fid); 857 return NULL; 858 } 859 860 static void p9_fid_destroy(struct p9_fid *fid) 861 { 862 struct p9_client *clnt; 863 unsigned long flags; 864 865 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 866 trace_9p_fid_ref(fid, P9_FID_REF_DESTROY); 867 clnt = fid->clnt; 868 spin_lock_irqsave(&clnt->lock, flags); 869 idr_remove(&clnt->fids, fid->fid); 870 spin_unlock_irqrestore(&clnt->lock, flags); 871 kfree(fid->rdir); 872 kfree(fid); 873 } 874 875 /* We also need to export tracepoint symbols for tracepoint_enabled() */ 876 EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref); 877 878 void do_trace_9p_fid_get(struct p9_fid *fid) 879 { 880 trace_9p_fid_ref(fid, P9_FID_REF_GET); 881 } 882 EXPORT_SYMBOL(do_trace_9p_fid_get); 883 884 void do_trace_9p_fid_put(struct p9_fid *fid) 885 { 886 trace_9p_fid_ref(fid, P9_FID_REF_PUT); 887 } 888 EXPORT_SYMBOL(do_trace_9p_fid_put); 889 890 static int p9_client_version(struct p9_client *c) 891 { 892 int err = 0; 893 struct p9_req_t *req; 894 char *version = NULL; 895 int msize; 896 897 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 898 c->msize, c->proto_version); 899 900 switch (c->proto_version) { 901 case p9_proto_2000L: 902 req = p9_client_rpc(c, P9_TVERSION, "ds", 903 c->msize, "9P2000.L"); 904 break; 905 case p9_proto_2000u: 906 req = p9_client_rpc(c, P9_TVERSION, "ds", 907 c->msize, "9P2000.u"); 908 break; 909 case p9_proto_legacy: 910 req = p9_client_rpc(c, P9_TVERSION, "ds", 911 c->msize, "9P2000"); 912 break; 913 default: 914 return -EINVAL; 915 } 916 917 if (IS_ERR(req)) 918 return PTR_ERR(req); 919 920 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); 921 if (err) { 922 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 923 trace_9p_protocol_dump(c, &req->rc); 924 goto error; 925 } 926 927 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 928 if (!strncmp(version, "9P2000.L", 8)) { 929 c->proto_version = p9_proto_2000L; 930 } else if (!strncmp(version, "9P2000.u", 8)) { 931 c->proto_version = p9_proto_2000u; 932 } else if (!strncmp(version, "9P2000", 6)) { 933 c->proto_version = p9_proto_legacy; 934 } else { 935 p9_debug(P9_DEBUG_ERROR, 936 "server returned an unknown version: %s\n", version); 937 err = -EREMOTEIO; 938 goto error; 939 } 940 941 if (msize < 4096) { 942 p9_debug(P9_DEBUG_ERROR, 943 "server returned a msize < 4096: %d\n", msize); 944 err = -EREMOTEIO; 945 goto error; 946 } 947 if (msize < c->msize) 948 c->msize = msize; 949 950 error: 951 kfree(version); 952 p9_req_put(c, req); 953 954 return err; 955 } 956 957 struct p9_client *p9_client_create(const char *dev_name, char *options) 958 { 959 int err; 960 struct p9_client *clnt; 961 char *client_id; 962 963 err = 0; 964 clnt = kmalloc(sizeof(*clnt), GFP_KERNEL); 965 if (!clnt) 966 return ERR_PTR(-ENOMEM); 967 968 clnt->trans_mod = NULL; 969 clnt->trans = NULL; 970 clnt->fcall_cache = NULL; 971 972 client_id = utsname()->nodename; 973 memcpy(clnt->name, client_id, strlen(client_id) + 1); 974 975 spin_lock_init(&clnt->lock); 976 idr_init(&clnt->fids); 977 idr_init(&clnt->reqs); 978 979 err = parse_opts(options, clnt); 980 if (err < 0) 981 goto free_client; 982 983 if (!clnt->trans_mod) 984 clnt->trans_mod = v9fs_get_default_trans(); 985 986 if (!clnt->trans_mod) { 987 err = -EPROTONOSUPPORT; 988 p9_debug(P9_DEBUG_ERROR, 989 "No transport defined or default transport\n"); 990 goto free_client; 991 } 992 993 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 994 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 995 996 err = clnt->trans_mod->create(clnt, dev_name, options); 997 if (err) 998 goto put_trans; 999 1000 if (clnt->msize > clnt->trans_mod->maxsize) { 1001 clnt->msize = clnt->trans_mod->maxsize; 1002 pr_info("Limiting 'msize' to %d as this is the maximum " 1003 "supported by transport %s\n", 1004 clnt->msize, clnt->trans_mod->name 1005 ); 1006 } 1007 1008 if (clnt->msize < 4096) { 1009 p9_debug(P9_DEBUG_ERROR, 1010 "Please specify a msize of at least 4k\n"); 1011 err = -EINVAL; 1012 goto close_trans; 1013 } 1014 1015 err = p9_client_version(clnt); 1016 if (err) 1017 goto close_trans; 1018 1019 /* P9_HDRSZ + 4 is the smallest packet header we can have that is 1020 * followed by data accessed from userspace by read 1021 */ 1022 clnt->fcall_cache = 1023 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, 1024 0, 0, P9_HDRSZ + 4, 1025 clnt->msize - (P9_HDRSZ + 4), 1026 NULL); 1027 1028 return clnt; 1029 1030 close_trans: 1031 clnt->trans_mod->close(clnt); 1032 put_trans: 1033 v9fs_put_trans(clnt->trans_mod); 1034 free_client: 1035 kfree(clnt); 1036 return ERR_PTR(err); 1037 } 1038 EXPORT_SYMBOL(p9_client_create); 1039 1040 void p9_client_destroy(struct p9_client *clnt) 1041 { 1042 struct p9_fid *fid; 1043 int id; 1044 1045 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1046 1047 if (clnt->trans_mod) 1048 clnt->trans_mod->close(clnt); 1049 1050 v9fs_put_trans(clnt->trans_mod); 1051 1052 idr_for_each_entry(&clnt->fids, fid, id) { 1053 pr_info("Found fid %d not clunked\n", fid->fid); 1054 p9_fid_destroy(fid); 1055 } 1056 1057 p9_tag_cleanup(clnt); 1058 1059 kmem_cache_destroy(clnt->fcall_cache); 1060 kfree(clnt); 1061 } 1062 EXPORT_SYMBOL(p9_client_destroy); 1063 1064 void p9_client_disconnect(struct p9_client *clnt) 1065 { 1066 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1067 clnt->status = Disconnected; 1068 } 1069 EXPORT_SYMBOL(p9_client_disconnect); 1070 1071 void p9_client_begin_disconnect(struct p9_client *clnt) 1072 { 1073 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1074 clnt->status = BeginDisconnect; 1075 } 1076 EXPORT_SYMBOL(p9_client_begin_disconnect); 1077 1078 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1079 const char *uname, kuid_t n_uname, 1080 const char *aname) 1081 { 1082 int err = 0; 1083 struct p9_req_t *req; 1084 struct p9_fid *fid; 1085 struct p9_qid qid; 1086 1087 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1088 afid ? afid->fid : -1, uname, aname); 1089 fid = p9_fid_create(clnt); 1090 if (!fid) { 1091 err = -ENOMEM; 1092 goto error; 1093 } 1094 fid->uid = n_uname; 1095 1096 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1097 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1098 if (IS_ERR(req)) { 1099 err = PTR_ERR(req); 1100 goto error; 1101 } 1102 1103 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); 1104 if (err) { 1105 trace_9p_protocol_dump(clnt, &req->rc); 1106 p9_req_put(clnt, req); 1107 goto error; 1108 } 1109 1110 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1111 qid.type, qid.path, qid.version); 1112 1113 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1114 1115 p9_req_put(clnt, req); 1116 return fid; 1117 1118 error: 1119 if (fid) 1120 p9_fid_destroy(fid); 1121 return ERR_PTR(err); 1122 } 1123 EXPORT_SYMBOL(p9_client_attach); 1124 1125 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1126 const unsigned char * const *wnames, int clone) 1127 { 1128 int err; 1129 struct p9_client *clnt; 1130 struct p9_fid *fid; 1131 struct p9_qid *wqids; 1132 struct p9_req_t *req; 1133 u16 nwqids, count; 1134 1135 err = 0; 1136 wqids = NULL; 1137 clnt = oldfid->clnt; 1138 if (clone) { 1139 fid = p9_fid_create(clnt); 1140 if (!fid) { 1141 err = -ENOMEM; 1142 goto error; 1143 } 1144 1145 fid->uid = oldfid->uid; 1146 } else { 1147 fid = oldfid; 1148 } 1149 1150 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1151 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1152 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1153 nwname, wnames); 1154 if (IS_ERR(req)) { 1155 err = PTR_ERR(req); 1156 goto error; 1157 } 1158 1159 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1160 if (err) { 1161 trace_9p_protocol_dump(clnt, &req->rc); 1162 p9_req_put(clnt, req); 1163 goto clunk_fid; 1164 } 1165 p9_req_put(clnt, req); 1166 1167 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1168 1169 if (nwqids != nwname) { 1170 err = -ENOENT; 1171 goto clunk_fid; 1172 } 1173 1174 for (count = 0; count < nwqids; count++) 1175 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1176 count, wqids[count].type, 1177 wqids[count].path, 1178 wqids[count].version); 1179 1180 if (nwname) 1181 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1182 else 1183 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); 1184 1185 kfree(wqids); 1186 return fid; 1187 1188 clunk_fid: 1189 kfree(wqids); 1190 p9_fid_put(fid); 1191 fid = NULL; 1192 1193 error: 1194 if (fid && fid != oldfid) 1195 p9_fid_destroy(fid); 1196 1197 return ERR_PTR(err); 1198 } 1199 EXPORT_SYMBOL(p9_client_walk); 1200 1201 int p9_client_open(struct p9_fid *fid, int mode) 1202 { 1203 int err; 1204 struct p9_client *clnt; 1205 struct p9_req_t *req; 1206 struct p9_qid qid; 1207 int iounit; 1208 1209 clnt = fid->clnt; 1210 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1211 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1212 err = 0; 1213 1214 if (fid->mode != -1) 1215 return -EINVAL; 1216 1217 if (p9_is_proto_dotl(clnt)) 1218 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1219 else 1220 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1221 if (IS_ERR(req)) { 1222 err = PTR_ERR(req); 1223 goto error; 1224 } 1225 1226 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1227 if (err) { 1228 trace_9p_protocol_dump(clnt, &req->rc); 1229 goto free_and_error; 1230 } 1231 1232 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1233 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1234 qid.path, qid.version, iounit); 1235 1236 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1237 fid->mode = mode; 1238 fid->iounit = iounit; 1239 1240 free_and_error: 1241 p9_req_put(clnt, req); 1242 error: 1243 return err; 1244 } 1245 EXPORT_SYMBOL(p9_client_open); 1246 1247 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, 1248 u32 mode, kgid_t gid, struct p9_qid *qid) 1249 { 1250 int err = 0; 1251 struct p9_client *clnt; 1252 struct p9_req_t *req; 1253 int iounit; 1254 1255 p9_debug(P9_DEBUG_9P, 1256 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1257 ofid->fid, name, flags, mode, 1258 from_kgid(&init_user_ns, gid)); 1259 clnt = ofid->clnt; 1260 1261 if (ofid->mode != -1) 1262 return -EINVAL; 1263 1264 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1265 mode, gid); 1266 if (IS_ERR(req)) { 1267 err = PTR_ERR(req); 1268 goto error; 1269 } 1270 1271 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); 1272 if (err) { 1273 trace_9p_protocol_dump(clnt, &req->rc); 1274 goto free_and_error; 1275 } 1276 1277 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1278 qid->type, qid->path, qid->version, iounit); 1279 1280 memmove(&ofid->qid, qid, sizeof(struct p9_qid)); 1281 ofid->mode = mode; 1282 ofid->iounit = iounit; 1283 1284 free_and_error: 1285 p9_req_put(clnt, req); 1286 error: 1287 return err; 1288 } 1289 EXPORT_SYMBOL(p9_client_create_dotl); 1290 1291 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1292 char *extension) 1293 { 1294 int err; 1295 struct p9_client *clnt; 1296 struct p9_req_t *req; 1297 struct p9_qid qid; 1298 int iounit; 1299 1300 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1301 fid->fid, name, perm, mode); 1302 err = 0; 1303 clnt = fid->clnt; 1304 1305 if (fid->mode != -1) 1306 return -EINVAL; 1307 1308 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1309 mode, extension); 1310 if (IS_ERR(req)) { 1311 err = PTR_ERR(req); 1312 goto error; 1313 } 1314 1315 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1316 if (err) { 1317 trace_9p_protocol_dump(clnt, &req->rc); 1318 goto free_and_error; 1319 } 1320 1321 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1322 qid.type, qid.path, qid.version, iounit); 1323 1324 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1325 fid->mode = mode; 1326 fid->iounit = iounit; 1327 1328 free_and_error: 1329 p9_req_put(clnt, req); 1330 error: 1331 return err; 1332 } 1333 EXPORT_SYMBOL(p9_client_fcreate); 1334 1335 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1336 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1337 { 1338 int err = 0; 1339 struct p9_client *clnt; 1340 struct p9_req_t *req; 1341 1342 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1343 dfid->fid, name, symtgt); 1344 clnt = dfid->clnt; 1345 1346 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1347 gid); 1348 if (IS_ERR(req)) { 1349 err = PTR_ERR(req); 1350 goto error; 1351 } 1352 1353 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 1354 if (err) { 1355 trace_9p_protocol_dump(clnt, &req->rc); 1356 goto free_and_error; 1357 } 1358 1359 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1360 qid->type, qid->path, qid->version); 1361 1362 free_and_error: 1363 p9_req_put(clnt, req); 1364 error: 1365 return err; 1366 } 1367 EXPORT_SYMBOL(p9_client_symlink); 1368 1369 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1370 { 1371 struct p9_client *clnt; 1372 struct p9_req_t *req; 1373 1374 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1375 dfid->fid, oldfid->fid, newname); 1376 clnt = dfid->clnt; 1377 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1378 newname); 1379 if (IS_ERR(req)) 1380 return PTR_ERR(req); 1381 1382 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1383 p9_req_put(clnt, req); 1384 return 0; 1385 } 1386 EXPORT_SYMBOL(p9_client_link); 1387 1388 int p9_client_fsync(struct p9_fid *fid, int datasync) 1389 { 1390 int err; 1391 struct p9_client *clnt; 1392 struct p9_req_t *req; 1393 1394 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1395 fid->fid, datasync); 1396 err = 0; 1397 clnt = fid->clnt; 1398 1399 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1400 if (IS_ERR(req)) { 1401 err = PTR_ERR(req); 1402 goto error; 1403 } 1404 1405 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1406 1407 p9_req_put(clnt, req); 1408 1409 error: 1410 return err; 1411 } 1412 EXPORT_SYMBOL(p9_client_fsync); 1413 1414 int p9_client_clunk(struct p9_fid *fid) 1415 { 1416 int err; 1417 struct p9_client *clnt; 1418 struct p9_req_t *req; 1419 int retries = 0; 1420 1421 again: 1422 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", 1423 fid->fid, retries); 1424 err = 0; 1425 clnt = fid->clnt; 1426 1427 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1428 if (IS_ERR(req)) { 1429 err = PTR_ERR(req); 1430 goto error; 1431 } 1432 1433 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1434 1435 p9_req_put(clnt, req); 1436 error: 1437 /* Fid is not valid even after a failed clunk 1438 * If interrupted, retry once then give up and 1439 * leak fid until umount. 1440 */ 1441 if (err == -ERESTARTSYS) { 1442 if (retries++ == 0) 1443 goto again; 1444 } else { 1445 p9_fid_destroy(fid); 1446 } 1447 return err; 1448 } 1449 EXPORT_SYMBOL(p9_client_clunk); 1450 1451 int p9_client_remove(struct p9_fid *fid) 1452 { 1453 int err; 1454 struct p9_client *clnt; 1455 struct p9_req_t *req; 1456 1457 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1458 err = 0; 1459 clnt = fid->clnt; 1460 1461 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1462 if (IS_ERR(req)) { 1463 err = PTR_ERR(req); 1464 goto error; 1465 } 1466 1467 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1468 1469 p9_req_put(clnt, req); 1470 error: 1471 if (err == -ERESTARTSYS) 1472 p9_fid_put(fid); 1473 else 1474 p9_fid_destroy(fid); 1475 return err; 1476 } 1477 EXPORT_SYMBOL(p9_client_remove); 1478 1479 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1480 { 1481 int err = 0; 1482 struct p9_req_t *req; 1483 struct p9_client *clnt; 1484 1485 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1486 dfid->fid, name, flags); 1487 1488 clnt = dfid->clnt; 1489 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1490 if (IS_ERR(req)) { 1491 err = PTR_ERR(req); 1492 goto error; 1493 } 1494 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1495 1496 p9_req_put(clnt, req); 1497 error: 1498 return err; 1499 } 1500 EXPORT_SYMBOL(p9_client_unlinkat); 1501 1502 int 1503 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1504 { 1505 int total = 0; 1506 *err = 0; 1507 1508 while (iov_iter_count(to)) { 1509 int count; 1510 1511 count = p9_client_read_once(fid, offset, to, err); 1512 if (!count || *err) 1513 break; 1514 offset += count; 1515 total += count; 1516 } 1517 return total; 1518 } 1519 EXPORT_SYMBOL(p9_client_read); 1520 1521 int 1522 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, 1523 int *err) 1524 { 1525 struct p9_client *clnt = fid->clnt; 1526 struct p9_req_t *req; 1527 int count = iov_iter_count(to); 1528 int rsize, received, non_zc = 0; 1529 char *dataptr; 1530 1531 *err = 0; 1532 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n", 1533 fid->fid, offset, iov_iter_count(to)); 1534 1535 rsize = fid->iounit; 1536 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1537 rsize = clnt->msize - P9_IOHDRSZ; 1538 1539 if (count < rsize) 1540 rsize = count; 1541 1542 /* Don't bother zerocopy for small IO (< 1024) */ 1543 if (clnt->trans_mod->zc_request && rsize > 1024) { 1544 /* response header len is 11 1545 * PDU Header(7) + IO Size (4) 1546 */ 1547 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1548 0, 11, "dqd", fid->fid, 1549 offset, rsize); 1550 } else { 1551 non_zc = 1; 1552 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1553 rsize); 1554 } 1555 if (IS_ERR(req)) { 1556 *err = PTR_ERR(req); 1557 if (!non_zc) 1558 iov_iter_revert(to, count - iov_iter_count(to)); 1559 return 0; 1560 } 1561 1562 *err = p9pdu_readf(&req->rc, clnt->proto_version, 1563 "D", &received, &dataptr); 1564 if (*err) { 1565 if (!non_zc) 1566 iov_iter_revert(to, count - iov_iter_count(to)); 1567 trace_9p_protocol_dump(clnt, &req->rc); 1568 p9_req_put(clnt, req); 1569 return 0; 1570 } 1571 if (rsize < received) { 1572 pr_err("bogus RREAD count (%d > %d)\n", received, rsize); 1573 received = rsize; 1574 } 1575 1576 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1577 1578 if (non_zc) { 1579 int n = copy_to_iter(dataptr, received, to); 1580 1581 if (n != received) { 1582 *err = -EFAULT; 1583 p9_req_put(clnt, req); 1584 return n; 1585 } 1586 } else { 1587 iov_iter_revert(to, count - received - iov_iter_count(to)); 1588 } 1589 p9_req_put(clnt, req); 1590 return received; 1591 } 1592 EXPORT_SYMBOL(p9_client_read_once); 1593 1594 int 1595 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1596 { 1597 struct p9_client *clnt = fid->clnt; 1598 struct p9_req_t *req; 1599 int total = 0; 1600 *err = 0; 1601 1602 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", 1603 fid->fid, offset, iov_iter_count(from)); 1604 1605 while (iov_iter_count(from)) { 1606 int count = iov_iter_count(from); 1607 int rsize = fid->iounit; 1608 int written; 1609 1610 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1611 rsize = clnt->msize - P9_IOHDRSZ; 1612 1613 if (count < rsize) 1614 rsize = count; 1615 1616 /* Don't bother zerocopy for small IO (< 1024) */ 1617 if (clnt->trans_mod->zc_request && rsize > 1024) { 1618 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1619 rsize, P9_ZC_HDR_SZ, "dqd", 1620 fid->fid, offset, rsize); 1621 } else { 1622 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1623 offset, rsize, from); 1624 } 1625 if (IS_ERR(req)) { 1626 iov_iter_revert(from, count - iov_iter_count(from)); 1627 *err = PTR_ERR(req); 1628 break; 1629 } 1630 1631 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written); 1632 if (*err) { 1633 iov_iter_revert(from, count - iov_iter_count(from)); 1634 trace_9p_protocol_dump(clnt, &req->rc); 1635 p9_req_put(clnt, req); 1636 break; 1637 } 1638 if (rsize < written) { 1639 pr_err("bogus RWRITE count (%d > %d)\n", written, rsize); 1640 written = rsize; 1641 } 1642 1643 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1644 1645 p9_req_put(clnt, req); 1646 iov_iter_revert(from, count - written - iov_iter_count(from)); 1647 total += written; 1648 offset += written; 1649 } 1650 return total; 1651 } 1652 EXPORT_SYMBOL(p9_client_write); 1653 1654 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1655 { 1656 int err; 1657 struct p9_client *clnt; 1658 struct p9_wstat *ret; 1659 struct p9_req_t *req; 1660 u16 ignored; 1661 1662 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1663 1664 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1665 if (!ret) 1666 return ERR_PTR(-ENOMEM); 1667 1668 err = 0; 1669 clnt = fid->clnt; 1670 1671 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1672 if (IS_ERR(req)) { 1673 err = PTR_ERR(req); 1674 goto error; 1675 } 1676 1677 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); 1678 if (err) { 1679 trace_9p_protocol_dump(clnt, &req->rc); 1680 p9_req_put(clnt, req); 1681 goto error; 1682 } 1683 1684 p9_debug(P9_DEBUG_9P, 1685 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1686 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1687 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1688 "<<< uid=%d gid=%d n_muid=%d\n", 1689 ret->size, ret->type, ret->dev, ret->qid.type, ret->qid.path, 1690 ret->qid.version, ret->mode, 1691 ret->atime, ret->mtime, ret->length, 1692 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1693 from_kuid(&init_user_ns, ret->n_uid), 1694 from_kgid(&init_user_ns, ret->n_gid), 1695 from_kuid(&init_user_ns, ret->n_muid)); 1696 1697 p9_req_put(clnt, req); 1698 return ret; 1699 1700 error: 1701 kfree(ret); 1702 return ERR_PTR(err); 1703 } 1704 EXPORT_SYMBOL(p9_client_stat); 1705 1706 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1707 u64 request_mask) 1708 { 1709 int err; 1710 struct p9_client *clnt; 1711 struct p9_stat_dotl *ret; 1712 struct p9_req_t *req; 1713 1714 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1715 fid->fid, request_mask); 1716 1717 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1718 if (!ret) 1719 return ERR_PTR(-ENOMEM); 1720 1721 err = 0; 1722 clnt = fid->clnt; 1723 1724 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1725 if (IS_ERR(req)) { 1726 err = PTR_ERR(req); 1727 goto error; 1728 } 1729 1730 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); 1731 if (err) { 1732 trace_9p_protocol_dump(clnt, &req->rc); 1733 p9_req_put(clnt, req); 1734 goto error; 1735 } 1736 1737 p9_debug(P9_DEBUG_9P, "<<< RGETATTR st_result_mask=%lld\n" 1738 "<<< qid=%x.%llx.%x\n" 1739 "<<< st_mode=%8.8x st_nlink=%llu\n" 1740 "<<< st_uid=%d st_gid=%d\n" 1741 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1742 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1743 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1744 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1745 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1746 "<<< st_gen=%lld st_data_version=%lld\n", 1747 ret->st_result_mask, 1748 ret->qid.type, ret->qid.path, ret->qid.version, 1749 ret->st_mode, ret->st_nlink, 1750 from_kuid(&init_user_ns, ret->st_uid), 1751 from_kgid(&init_user_ns, ret->st_gid), 1752 ret->st_rdev, ret->st_size, ret->st_blksize, ret->st_blocks, 1753 ret->st_atime_sec, ret->st_atime_nsec, 1754 ret->st_mtime_sec, ret->st_mtime_nsec, 1755 ret->st_ctime_sec, ret->st_ctime_nsec, 1756 ret->st_btime_sec, ret->st_btime_nsec, 1757 ret->st_gen, ret->st_data_version); 1758 1759 p9_req_put(clnt, req); 1760 return ret; 1761 1762 error: 1763 kfree(ret); 1764 return ERR_PTR(err); 1765 } 1766 EXPORT_SYMBOL(p9_client_getattr_dotl); 1767 1768 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1769 { 1770 int ret; 1771 1772 /* NOTE: size shouldn't include its own length */ 1773 /* size[2] type[2] dev[4] qid[13] */ 1774 /* mode[4] atime[4] mtime[4] length[8]*/ 1775 /* name[s] uid[s] gid[s] muid[s] */ 1776 ret = 2 + 4 + 13 + 4 + 4 + 4 + 8 + 2 + 2 + 2 + 2; 1777 1778 if (wst->name) 1779 ret += strlen(wst->name); 1780 if (wst->uid) 1781 ret += strlen(wst->uid); 1782 if (wst->gid) 1783 ret += strlen(wst->gid); 1784 if (wst->muid) 1785 ret += strlen(wst->muid); 1786 1787 if (proto_version == p9_proto_2000u || 1788 proto_version == p9_proto_2000L) { 1789 /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1790 ret += 2 + 4 + 4 + 4; 1791 if (wst->extension) 1792 ret += strlen(wst->extension); 1793 } 1794 1795 return ret; 1796 } 1797 1798 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1799 { 1800 int err; 1801 struct p9_req_t *req; 1802 struct p9_client *clnt; 1803 1804 err = 0; 1805 clnt = fid->clnt; 1806 wst->size = p9_client_statsize(wst, clnt->proto_version); 1807 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", 1808 fid->fid); 1809 p9_debug(P9_DEBUG_9P, 1810 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1811 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1812 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1813 " uid=%d gid=%d n_muid=%d\n", 1814 wst->size, wst->type, wst->dev, wst->qid.type, 1815 wst->qid.path, wst->qid.version, 1816 wst->mode, wst->atime, wst->mtime, wst->length, 1817 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1818 from_kuid(&init_user_ns, wst->n_uid), 1819 from_kgid(&init_user_ns, wst->n_gid), 1820 from_kuid(&init_user_ns, wst->n_muid)); 1821 1822 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", 1823 fid->fid, wst->size + 2, wst); 1824 if (IS_ERR(req)) { 1825 err = PTR_ERR(req); 1826 goto error; 1827 } 1828 1829 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1830 1831 p9_req_put(clnt, req); 1832 error: 1833 return err; 1834 } 1835 EXPORT_SYMBOL(p9_client_wstat); 1836 1837 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1838 { 1839 int err; 1840 struct p9_req_t *req; 1841 struct p9_client *clnt; 1842 1843 err = 0; 1844 clnt = fid->clnt; 1845 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1846 p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n", 1847 p9attr->valid, p9attr->mode, 1848 from_kuid(&init_user_ns, p9attr->uid), 1849 from_kgid(&init_user_ns, p9attr->gid), 1850 p9attr->size); 1851 p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n", 1852 p9attr->atime_sec, p9attr->atime_nsec); 1853 p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n", 1854 p9attr->mtime_sec, p9attr->mtime_nsec); 1855 1856 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1857 1858 if (IS_ERR(req)) { 1859 err = PTR_ERR(req); 1860 goto error; 1861 } 1862 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1863 p9_req_put(clnt, req); 1864 error: 1865 return err; 1866 } 1867 EXPORT_SYMBOL(p9_client_setattr); 1868 1869 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1870 { 1871 int err; 1872 struct p9_req_t *req; 1873 struct p9_client *clnt; 1874 1875 err = 0; 1876 clnt = fid->clnt; 1877 1878 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1879 1880 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1881 if (IS_ERR(req)) { 1882 err = PTR_ERR(req); 1883 goto error; 1884 } 1885 1886 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1887 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1888 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1889 if (err) { 1890 trace_9p_protocol_dump(clnt, &req->rc); 1891 p9_req_put(clnt, req); 1892 goto error; 1893 } 1894 1895 p9_debug(P9_DEBUG_9P, 1896 "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n", 1897 fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree, 1898 sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen); 1899 1900 p9_req_put(clnt, req); 1901 error: 1902 return err; 1903 } 1904 EXPORT_SYMBOL(p9_client_statfs); 1905 1906 int p9_client_rename(struct p9_fid *fid, 1907 struct p9_fid *newdirfid, const char *name) 1908 { 1909 int err; 1910 struct p9_req_t *req; 1911 struct p9_client *clnt; 1912 1913 err = 0; 1914 clnt = fid->clnt; 1915 1916 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1917 fid->fid, newdirfid->fid, name); 1918 1919 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1920 newdirfid->fid, name); 1921 if (IS_ERR(req)) { 1922 err = PTR_ERR(req); 1923 goto error; 1924 } 1925 1926 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1927 1928 p9_req_put(clnt, req); 1929 error: 1930 return err; 1931 } 1932 EXPORT_SYMBOL(p9_client_rename); 1933 1934 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1935 struct p9_fid *newdirfid, const char *new_name) 1936 { 1937 int err; 1938 struct p9_req_t *req; 1939 struct p9_client *clnt; 1940 1941 err = 0; 1942 clnt = olddirfid->clnt; 1943 1944 p9_debug(P9_DEBUG_9P, 1945 ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n", 1946 olddirfid->fid, old_name, newdirfid->fid, new_name); 1947 1948 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1949 old_name, newdirfid->fid, new_name); 1950 if (IS_ERR(req)) { 1951 err = PTR_ERR(req); 1952 goto error; 1953 } 1954 1955 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1956 newdirfid->fid, new_name); 1957 1958 p9_req_put(clnt, req); 1959 error: 1960 return err; 1961 } 1962 EXPORT_SYMBOL(p9_client_renameat); 1963 1964 /* An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1965 */ 1966 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1967 const char *attr_name, u64 *attr_size) 1968 { 1969 int err; 1970 struct p9_req_t *req; 1971 struct p9_client *clnt; 1972 struct p9_fid *attr_fid; 1973 1974 err = 0; 1975 clnt = file_fid->clnt; 1976 attr_fid = p9_fid_create(clnt); 1977 if (!attr_fid) { 1978 err = -ENOMEM; 1979 goto error; 1980 } 1981 p9_debug(P9_DEBUG_9P, 1982 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 1983 file_fid->fid, attr_fid->fid, attr_name); 1984 1985 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 1986 file_fid->fid, attr_fid->fid, attr_name); 1987 if (IS_ERR(req)) { 1988 err = PTR_ERR(req); 1989 goto error; 1990 } 1991 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); 1992 if (err) { 1993 trace_9p_protocol_dump(clnt, &req->rc); 1994 p9_req_put(clnt, req); 1995 goto clunk_fid; 1996 } 1997 p9_req_put(clnt, req); 1998 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 1999 attr_fid->fid, *attr_size); 2000 return attr_fid; 2001 clunk_fid: 2002 p9_fid_put(attr_fid); 2003 attr_fid = NULL; 2004 error: 2005 if (attr_fid && attr_fid != file_fid) 2006 p9_fid_destroy(attr_fid); 2007 2008 return ERR_PTR(err); 2009 } 2010 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2011 2012 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2013 u64 attr_size, int flags) 2014 { 2015 int err; 2016 struct p9_req_t *req; 2017 struct p9_client *clnt; 2018 2019 p9_debug(P9_DEBUG_9P, 2020 ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n", 2021 fid->fid, name, attr_size, flags); 2022 err = 0; 2023 clnt = fid->clnt; 2024 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2025 fid->fid, name, attr_size, flags); 2026 if (IS_ERR(req)) { 2027 err = PTR_ERR(req); 2028 goto error; 2029 } 2030 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2031 p9_req_put(clnt, req); 2032 error: 2033 return err; 2034 } 2035 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2036 2037 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2038 { 2039 int err, rsize, non_zc = 0; 2040 struct p9_client *clnt; 2041 struct p9_req_t *req; 2042 char *dataptr; 2043 struct kvec kv = {.iov_base = data, .iov_len = count}; 2044 struct iov_iter to; 2045 2046 iov_iter_kvec(&to, ITER_DEST, &kv, 1, count); 2047 2048 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2049 fid->fid, offset, count); 2050 2051 err = 0; 2052 clnt = fid->clnt; 2053 2054 rsize = fid->iounit; 2055 if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ) 2056 rsize = clnt->msize - P9_READDIRHDRSZ; 2057 2058 if (count < rsize) 2059 rsize = count; 2060 2061 /* Don't bother zerocopy for small IO (< 1024) */ 2062 if (clnt->trans_mod->zc_request && rsize > 1024) { 2063 /* response header len is 11 2064 * PDU Header(7) + IO Size (4) 2065 */ 2066 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2067 11, "dqd", fid->fid, offset, rsize); 2068 } else { 2069 non_zc = 1; 2070 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2071 offset, rsize); 2072 } 2073 if (IS_ERR(req)) { 2074 err = PTR_ERR(req); 2075 goto error; 2076 } 2077 2078 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); 2079 if (err) { 2080 trace_9p_protocol_dump(clnt, &req->rc); 2081 goto free_and_error; 2082 } 2083 if (rsize < count) { 2084 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2085 count = rsize; 2086 } 2087 2088 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2089 2090 if (non_zc) 2091 memmove(data, dataptr, count); 2092 2093 p9_req_put(clnt, req); 2094 return count; 2095 2096 free_and_error: 2097 p9_req_put(clnt, req); 2098 error: 2099 return err; 2100 } 2101 EXPORT_SYMBOL(p9_client_readdir); 2102 2103 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2104 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2105 { 2106 int err; 2107 struct p9_client *clnt; 2108 struct p9_req_t *req; 2109 2110 err = 0; 2111 clnt = fid->clnt; 2112 p9_debug(P9_DEBUG_9P, 2113 ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n", 2114 fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2115 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2116 MAJOR(rdev), MINOR(rdev), gid); 2117 if (IS_ERR(req)) 2118 return PTR_ERR(req); 2119 2120 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2121 if (err) { 2122 trace_9p_protocol_dump(clnt, &req->rc); 2123 goto error; 2124 } 2125 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", 2126 qid->type, qid->path, qid->version); 2127 2128 error: 2129 p9_req_put(clnt, req); 2130 return err; 2131 } 2132 EXPORT_SYMBOL(p9_client_mknod_dotl); 2133 2134 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2135 kgid_t gid, struct p9_qid *qid) 2136 { 2137 int err; 2138 struct p9_client *clnt; 2139 struct p9_req_t *req; 2140 2141 err = 0; 2142 clnt = fid->clnt; 2143 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2144 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2145 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", 2146 fid->fid, name, mode, gid); 2147 if (IS_ERR(req)) 2148 return PTR_ERR(req); 2149 2150 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2151 if (err) { 2152 trace_9p_protocol_dump(clnt, &req->rc); 2153 goto error; 2154 } 2155 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2156 qid->path, qid->version); 2157 2158 error: 2159 p9_req_put(clnt, req); 2160 return err; 2161 } 2162 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2163 2164 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2165 { 2166 int err; 2167 struct p9_client *clnt; 2168 struct p9_req_t *req; 2169 2170 err = 0; 2171 clnt = fid->clnt; 2172 p9_debug(P9_DEBUG_9P, 2173 ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n", 2174 fid->fid, flock->type, flock->flags, flock->start, 2175 flock->length, flock->proc_id, flock->client_id); 2176 2177 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2178 flock->flags, flock->start, flock->length, 2179 flock->proc_id, flock->client_id); 2180 2181 if (IS_ERR(req)) 2182 return PTR_ERR(req); 2183 2184 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); 2185 if (err) { 2186 trace_9p_protocol_dump(clnt, &req->rc); 2187 goto error; 2188 } 2189 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2190 error: 2191 p9_req_put(clnt, req); 2192 return err; 2193 } 2194 EXPORT_SYMBOL(p9_client_lock_dotl); 2195 2196 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 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, 2205 ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n", 2206 fid->fid, glock->type, glock->start, glock->length, 2207 glock->proc_id, glock->client_id); 2208 2209 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, 2210 glock->type, glock->start, glock->length, 2211 glock->proc_id, glock->client_id); 2212 2213 if (IS_ERR(req)) 2214 return PTR_ERR(req); 2215 2216 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, 2217 &glock->start, &glock->length, &glock->proc_id, 2218 &glock->client_id); 2219 if (err) { 2220 trace_9p_protocol_dump(clnt, &req->rc); 2221 goto error; 2222 } 2223 p9_debug(P9_DEBUG_9P, 2224 "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n", 2225 glock->type, glock->start, glock->length, 2226 glock->proc_id, glock->client_id); 2227 error: 2228 p9_req_put(clnt, req); 2229 return err; 2230 } 2231 EXPORT_SYMBOL(p9_client_getlock_dotl); 2232 2233 int p9_client_readlink(struct p9_fid *fid, char **target) 2234 { 2235 int err; 2236 struct p9_client *clnt; 2237 struct p9_req_t *req; 2238 2239 err = 0; 2240 clnt = fid->clnt; 2241 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2242 2243 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2244 if (IS_ERR(req)) 2245 return PTR_ERR(req); 2246 2247 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); 2248 if (err) { 2249 trace_9p_protocol_dump(clnt, &req->rc); 2250 goto error; 2251 } 2252 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2253 error: 2254 p9_req_put(clnt, req); 2255 return err; 2256 } 2257 EXPORT_SYMBOL(p9_client_readlink); 2258 2259 int __init p9_client_init(void) 2260 { 2261 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); 2262 return p9_req_cache ? 0 : -ENOMEM; 2263 } 2264 2265 void __exit p9_client_exit(void) 2266 { 2267 kmem_cache_destroy(p9_req_cache); 2268 } 2269