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 /* refcount needs to be set to 0 before inserting into the idr 301 * so p9_tag_lookup does not accept a request that is not fully 302 * initialized. refcount_set to 2 below will mark request ready. 303 */ 304 refcount_set(&req->refcount, 0); 305 init_waitqueue_head(&req->wq); 306 INIT_LIST_HEAD(&req->req_list); 307 308 idr_preload(GFP_NOFS); 309 spin_lock_irq(&c->lock); 310 if (type == P9_TVERSION) 311 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1, 312 GFP_NOWAIT); 313 else 314 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT); 315 req->tc.tag = tag; 316 spin_unlock_irq(&c->lock); 317 idr_preload_end(); 318 if (tag < 0) 319 goto free; 320 321 /* Init ref to two because in the general case there is one ref 322 * that is put asynchronously by a writer thread, one ref 323 * temporarily given by p9_tag_lookup and put by p9_client_cb 324 * in the recv thread, and one ref put by p9_req_put in the 325 * main thread. The only exception is virtio that does not use 326 * p9_tag_lookup but does not have a writer thread either 327 * (the write happens synchronously in the request/zc_request 328 * callback), so p9_client_cb eats the second ref there 329 * as the pointer is duplicated directly by virtqueue_add_sgs() 330 */ 331 refcount_set(&req->refcount, 2); 332 333 return req; 334 335 free: 336 p9_fcall_fini(&req->tc); 337 p9_fcall_fini(&req->rc); 338 free_req: 339 kmem_cache_free(p9_req_cache, req); 340 return ERR_PTR(-ENOMEM); 341 } 342 343 /** 344 * p9_tag_lookup - Look up a request by tag. 345 * @c: Client session. 346 * @tag: Transaction ID. 347 * 348 * Context: Any context. 349 * Return: A request, or %NULL if there is no request with that tag. 350 */ 351 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 352 { 353 struct p9_req_t *req; 354 355 rcu_read_lock(); 356 again: 357 req = idr_find(&c->reqs, tag); 358 if (req) { 359 /* We have to be careful with the req found under rcu_read_lock 360 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the 361 * ref again without corrupting other data, then check again 362 * that the tag matches once we have the ref 363 */ 364 if (!p9_req_try_get(req)) 365 goto again; 366 if (req->tc.tag != tag) { 367 p9_req_put(c, req); 368 goto again; 369 } 370 } 371 rcu_read_unlock(); 372 373 return req; 374 } 375 EXPORT_SYMBOL(p9_tag_lookup); 376 377 /** 378 * p9_tag_remove - Remove a tag. 379 * @c: Client session. 380 * @r: Request of reference. 381 * 382 * Context: Any context. 383 */ 384 static void p9_tag_remove(struct p9_client *c, struct p9_req_t *r) 385 { 386 unsigned long flags; 387 u16 tag = r->tc.tag; 388 389 p9_debug(P9_DEBUG_MUX, "freeing clnt %p req %p tag: %d\n", c, r, tag); 390 spin_lock_irqsave(&c->lock, flags); 391 idr_remove(&c->reqs, tag); 392 spin_unlock_irqrestore(&c->lock, flags); 393 } 394 395 int p9_req_put(struct p9_client *c, struct p9_req_t *r) 396 { 397 if (refcount_dec_and_test(&r->refcount)) { 398 p9_tag_remove(c, r); 399 400 p9_fcall_fini(&r->tc); 401 p9_fcall_fini(&r->rc); 402 kmem_cache_free(p9_req_cache, r); 403 return 1; 404 } 405 return 0; 406 } 407 EXPORT_SYMBOL(p9_req_put); 408 409 /** 410 * p9_tag_cleanup - cleans up tags structure and reclaims resources 411 * @c: v9fs client struct 412 * 413 * This frees resources associated with the tags structure 414 * 415 */ 416 static void p9_tag_cleanup(struct p9_client *c) 417 { 418 struct p9_req_t *req; 419 int id; 420 421 rcu_read_lock(); 422 idr_for_each_entry(&c->reqs, req, id) { 423 pr_info("Tag %d still in use\n", id); 424 if (p9_req_put(c, req) == 0) 425 pr_warn("Packet with tag %d has still references", 426 req->tc.tag); 427 } 428 rcu_read_unlock(); 429 } 430 431 /** 432 * p9_client_cb - call back from transport to client 433 * @c: client state 434 * @req: request received 435 * @status: request status, one of REQ_STATUS_* 436 * 437 */ 438 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) 439 { 440 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); 441 442 /* This barrier is needed to make sure any change made to req before 443 * the status change is visible to another thread 444 */ 445 smp_wmb(); 446 req->status = status; 447 448 wake_up(&req->wq); 449 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); 450 p9_req_put(c, req); 451 } 452 EXPORT_SYMBOL(p9_client_cb); 453 454 /** 455 * p9_parse_header - parse header arguments out of a packet 456 * @pdu: packet to parse 457 * @size: size of packet 458 * @type: type of request 459 * @tag: tag of packet 460 * @rewind: set if we need to rewind offset afterwards 461 */ 462 463 int 464 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, 465 int16_t *tag, int rewind) 466 { 467 s8 r_type; 468 s16 r_tag; 469 s32 r_size; 470 int offset = pdu->offset; 471 int err; 472 473 pdu->offset = 0; 474 475 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 476 if (err) 477 goto rewind_and_exit; 478 479 if (type) 480 *type = r_type; 481 if (tag) 482 *tag = r_tag; 483 if (size) 484 *size = r_size; 485 486 if (pdu->size != r_size || r_size < 7) { 487 err = -EINVAL; 488 goto rewind_and_exit; 489 } 490 491 pdu->id = r_type; 492 pdu->tag = r_tag; 493 494 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 495 pdu->size, pdu->id, pdu->tag); 496 497 rewind_and_exit: 498 if (rewind) 499 pdu->offset = offset; 500 return err; 501 } 502 EXPORT_SYMBOL(p9_parse_header); 503 504 /** 505 * p9_check_errors - check 9p packet for error return and process it 506 * @c: current client instance 507 * @req: request to parse and check for error conditions 508 * 509 * returns error code if one is discovered, otherwise returns 0 510 * 511 * this will have to be more complicated if we have multiple 512 * error packet types 513 */ 514 515 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 516 { 517 s8 type; 518 int err; 519 int ecode; 520 521 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 522 if (req->rc.size >= c->msize) { 523 p9_debug(P9_DEBUG_ERROR, 524 "requested packet size too big: %d\n", 525 req->rc.size); 526 return -EIO; 527 } 528 /* dump the response from server 529 * This should be after check errors which poplulate pdu_fcall. 530 */ 531 trace_9p_protocol_dump(c, &req->rc); 532 if (err) { 533 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 534 return err; 535 } 536 if (type != P9_RERROR && type != P9_RLERROR) 537 return 0; 538 539 if (!p9_is_proto_dotl(c)) { 540 char *ename; 541 542 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 543 &ename, &ecode); 544 if (err) 545 goto out_err; 546 547 if (p9_is_proto_dotu(c) && ecode < 512) 548 err = -ecode; 549 550 if (!err) { 551 err = p9_errstr2errno(ename, strlen(ename)); 552 553 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 554 -ecode, ename); 555 } 556 kfree(ename); 557 } else { 558 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 559 if (err) 560 goto out_err; 561 err = -ecode; 562 563 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 564 } 565 566 return err; 567 568 out_err: 569 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 570 571 return err; 572 } 573 574 static struct p9_req_t * 575 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 576 577 /** 578 * p9_client_flush - flush (cancel) a request 579 * @c: client state 580 * @oldreq: request to cancel 581 * 582 * This sents a flush for a particular request and links 583 * the flush request to the original request. The current 584 * code only supports a single flush request although the protocol 585 * allows for multiple flush requests to be sent for a single request. 586 * 587 */ 588 589 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 590 { 591 struct p9_req_t *req; 592 s16 oldtag; 593 int err; 594 595 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); 596 if (err) 597 return err; 598 599 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 600 601 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 602 if (IS_ERR(req)) 603 return PTR_ERR(req); 604 605 /* if we haven't received a response for oldreq, 606 * remove it from the list 607 */ 608 if (oldreq->status == REQ_STATUS_SENT) { 609 if (c->trans_mod->cancelled) 610 c->trans_mod->cancelled(c, oldreq); 611 } 612 613 p9_req_put(c, req); 614 return 0; 615 } 616 617 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 618 int8_t type, uint t_size, uint r_size, 619 const char *fmt, va_list ap) 620 { 621 int err; 622 struct p9_req_t *req; 623 va_list apc; 624 625 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 626 627 /* we allow for any status other than disconnected */ 628 if (c->status == Disconnected) 629 return ERR_PTR(-EIO); 630 631 /* if status is begin_disconnected we allow only clunk request */ 632 if (c->status == BeginDisconnect && type != P9_TCLUNK) 633 return ERR_PTR(-EIO); 634 635 va_copy(apc, ap); 636 req = p9_tag_alloc(c, type, t_size, r_size, fmt, apc); 637 va_end(apc); 638 if (IS_ERR(req)) 639 return req; 640 641 /* marshall the data */ 642 p9pdu_prepare(&req->tc, req->tc.tag, type); 643 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); 644 if (err) 645 goto reterr; 646 p9pdu_finalize(c, &req->tc); 647 trace_9p_client_req(c, type, req->tc.tag); 648 return req; 649 reterr: 650 p9_req_put(c, req); 651 /* We have to put also the 2nd reference as it won't be used */ 652 p9_req_put(c, req); 653 return ERR_PTR(err); 654 } 655 656 /** 657 * p9_client_rpc - issue a request and wait for a response 658 * @c: client session 659 * @type: type of request 660 * @fmt: protocol format string (see protocol.c) 661 * 662 * Returns request structure (which client must free using p9_req_put) 663 */ 664 665 static struct p9_req_t * 666 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 667 { 668 va_list ap; 669 int sigpending, err; 670 unsigned long flags; 671 struct p9_req_t *req; 672 /* Passing zero for tsize/rsize to p9_client_prepare_req() tells it to 673 * auto determine an appropriate (small) request/response size 674 * according to actual message data being sent. Currently RDMA 675 * transport is excluded from this response message size optimization, 676 * as it would not cope with it, due to its pooled response buffers 677 * (using an optimized request size for RDMA as well though). 678 */ 679 const uint tsize = 0; 680 const uint rsize = c->trans_mod->pooled_rbuffers ? c->msize : 0; 681 682 va_start(ap, fmt); 683 req = p9_client_prepare_req(c, type, tsize, rsize, fmt, ap); 684 va_end(ap); 685 if (IS_ERR(req)) 686 return req; 687 688 if (signal_pending(current)) { 689 sigpending = 1; 690 clear_thread_flag(TIF_SIGPENDING); 691 } else { 692 sigpending = 0; 693 } 694 695 err = c->trans_mod->request(c, req); 696 if (err < 0) { 697 /* write won't happen */ 698 p9_req_put(c, req); 699 if (err != -ERESTARTSYS && err != -EFAULT) 700 c->status = Disconnected; 701 goto recalc_sigpending; 702 } 703 again: 704 /* Wait for the response */ 705 err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD); 706 707 /* Make sure our req is coherent with regard to updates in other 708 * threads - echoes to wmb() in the callback 709 */ 710 smp_rmb(); 711 712 if (err == -ERESTARTSYS && c->status == Connected && 713 type == P9_TFLUSH) { 714 sigpending = 1; 715 clear_thread_flag(TIF_SIGPENDING); 716 goto again; 717 } 718 719 if (req->status == REQ_STATUS_ERROR) { 720 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 721 err = req->t_err; 722 } 723 if (err == -ERESTARTSYS && c->status == Connected) { 724 p9_debug(P9_DEBUG_MUX, "flushing\n"); 725 sigpending = 1; 726 clear_thread_flag(TIF_SIGPENDING); 727 728 if (c->trans_mod->cancel(c, req)) 729 p9_client_flush(c, req); 730 731 /* if we received the response anyway, don't signal error */ 732 if (req->status == REQ_STATUS_RCVD) 733 err = 0; 734 } 735 recalc_sigpending: 736 if (sigpending) { 737 spin_lock_irqsave(¤t->sighand->siglock, flags); 738 recalc_sigpending(); 739 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 740 } 741 if (err < 0) 742 goto reterr; 743 744 err = p9_check_errors(c, req); 745 trace_9p_client_res(c, type, req->rc.tag, err); 746 if (!err) 747 return req; 748 reterr: 749 p9_req_put(c, req); 750 return ERR_PTR(safe_errno(err)); 751 } 752 753 /** 754 * p9_client_zc_rpc - issue a request and wait for a response 755 * @c: client session 756 * @type: type of request 757 * @uidata: destination for zero copy read 758 * @uodata: source for zero copy write 759 * @inlen: read buffer size 760 * @olen: write buffer size 761 * @in_hdrlen: reader header size, This is the size of response protocol data 762 * @fmt: protocol format string (see protocol.c) 763 * 764 * Returns request structure (which client must free using p9_req_put) 765 */ 766 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 767 struct iov_iter *uidata, 768 struct iov_iter *uodata, 769 int inlen, int olen, int in_hdrlen, 770 const char *fmt, ...) 771 { 772 va_list ap; 773 int sigpending, err; 774 unsigned long flags; 775 struct p9_req_t *req; 776 777 va_start(ap, fmt); 778 /* We allocate a inline protocol data of only 4k bytes. 779 * The actual content is passed in zero-copy fashion. 780 */ 781 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, P9_ZC_HDR_SZ, fmt, ap); 782 va_end(ap); 783 if (IS_ERR(req)) 784 return req; 785 786 if (signal_pending(current)) { 787 sigpending = 1; 788 clear_thread_flag(TIF_SIGPENDING); 789 } else { 790 sigpending = 0; 791 } 792 793 err = c->trans_mod->zc_request(c, req, uidata, uodata, 794 inlen, olen, in_hdrlen); 795 if (err < 0) { 796 if (err == -EIO) 797 c->status = Disconnected; 798 if (err != -ERESTARTSYS) 799 goto recalc_sigpending; 800 } 801 if (req->status == REQ_STATUS_ERROR) { 802 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 803 err = req->t_err; 804 } 805 if (err == -ERESTARTSYS && c->status == Connected) { 806 p9_debug(P9_DEBUG_MUX, "flushing\n"); 807 sigpending = 1; 808 clear_thread_flag(TIF_SIGPENDING); 809 810 if (c->trans_mod->cancel(c, req)) 811 p9_client_flush(c, req); 812 813 /* if we received the response anyway, don't signal error */ 814 if (req->status == REQ_STATUS_RCVD) 815 err = 0; 816 } 817 recalc_sigpending: 818 if (sigpending) { 819 spin_lock_irqsave(¤t->sighand->siglock, flags); 820 recalc_sigpending(); 821 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 822 } 823 if (err < 0) 824 goto reterr; 825 826 err = p9_check_errors(c, req); 827 trace_9p_client_res(c, type, req->rc.tag, err); 828 if (!err) 829 return req; 830 reterr: 831 p9_req_put(c, req); 832 return ERR_PTR(safe_errno(err)); 833 } 834 835 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 836 { 837 int ret; 838 struct p9_fid *fid; 839 840 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 841 fid = kzalloc(sizeof(*fid), GFP_KERNEL); 842 if (!fid) 843 return NULL; 844 845 fid->mode = -1; 846 fid->uid = current_fsuid(); 847 fid->clnt = clnt; 848 refcount_set(&fid->count, 1); 849 850 idr_preload(GFP_KERNEL); 851 spin_lock_irq(&clnt->lock); 852 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, 853 GFP_NOWAIT); 854 spin_unlock_irq(&clnt->lock); 855 idr_preload_end(); 856 if (!ret) { 857 trace_9p_fid_ref(fid, P9_FID_REF_CREATE); 858 return fid; 859 } 860 861 kfree(fid); 862 return NULL; 863 } 864 865 static void p9_fid_destroy(struct p9_fid *fid) 866 { 867 struct p9_client *clnt; 868 unsigned long flags; 869 870 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 871 trace_9p_fid_ref(fid, P9_FID_REF_DESTROY); 872 clnt = fid->clnt; 873 spin_lock_irqsave(&clnt->lock, flags); 874 idr_remove(&clnt->fids, fid->fid); 875 spin_unlock_irqrestore(&clnt->lock, flags); 876 kfree(fid->rdir); 877 kfree(fid); 878 } 879 880 /* We also need to export tracepoint symbols for tracepoint_enabled() */ 881 EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref); 882 883 void do_trace_9p_fid_get(struct p9_fid *fid) 884 { 885 trace_9p_fid_ref(fid, P9_FID_REF_GET); 886 } 887 EXPORT_SYMBOL(do_trace_9p_fid_get); 888 889 void do_trace_9p_fid_put(struct p9_fid *fid) 890 { 891 trace_9p_fid_ref(fid, P9_FID_REF_PUT); 892 } 893 EXPORT_SYMBOL(do_trace_9p_fid_put); 894 895 static int p9_client_version(struct p9_client *c) 896 { 897 int err = 0; 898 struct p9_req_t *req; 899 char *version = NULL; 900 int msize; 901 902 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 903 c->msize, c->proto_version); 904 905 switch (c->proto_version) { 906 case p9_proto_2000L: 907 req = p9_client_rpc(c, P9_TVERSION, "ds", 908 c->msize, "9P2000.L"); 909 break; 910 case p9_proto_2000u: 911 req = p9_client_rpc(c, P9_TVERSION, "ds", 912 c->msize, "9P2000.u"); 913 break; 914 case p9_proto_legacy: 915 req = p9_client_rpc(c, P9_TVERSION, "ds", 916 c->msize, "9P2000"); 917 break; 918 default: 919 return -EINVAL; 920 } 921 922 if (IS_ERR(req)) 923 return PTR_ERR(req); 924 925 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); 926 if (err) { 927 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 928 trace_9p_protocol_dump(c, &req->rc); 929 goto error; 930 } 931 932 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 933 if (!strncmp(version, "9P2000.L", 8)) { 934 c->proto_version = p9_proto_2000L; 935 } else if (!strncmp(version, "9P2000.u", 8)) { 936 c->proto_version = p9_proto_2000u; 937 } else if (!strncmp(version, "9P2000", 6)) { 938 c->proto_version = p9_proto_legacy; 939 } else { 940 p9_debug(P9_DEBUG_ERROR, 941 "server returned an unknown version: %s\n", version); 942 err = -EREMOTEIO; 943 goto error; 944 } 945 946 if (msize < 4096) { 947 p9_debug(P9_DEBUG_ERROR, 948 "server returned a msize < 4096: %d\n", msize); 949 err = -EREMOTEIO; 950 goto error; 951 } 952 if (msize < c->msize) 953 c->msize = msize; 954 955 error: 956 kfree(version); 957 p9_req_put(c, req); 958 959 return err; 960 } 961 962 struct p9_client *p9_client_create(const char *dev_name, char *options) 963 { 964 int err; 965 struct p9_client *clnt; 966 char *client_id; 967 968 err = 0; 969 clnt = kmalloc(sizeof(*clnt), GFP_KERNEL); 970 if (!clnt) 971 return ERR_PTR(-ENOMEM); 972 973 clnt->trans_mod = NULL; 974 clnt->trans = NULL; 975 clnt->fcall_cache = NULL; 976 977 client_id = utsname()->nodename; 978 memcpy(clnt->name, client_id, strlen(client_id) + 1); 979 980 spin_lock_init(&clnt->lock); 981 idr_init(&clnt->fids); 982 idr_init(&clnt->reqs); 983 984 err = parse_opts(options, clnt); 985 if (err < 0) 986 goto free_client; 987 988 if (!clnt->trans_mod) 989 clnt->trans_mod = v9fs_get_default_trans(); 990 991 if (!clnt->trans_mod) { 992 err = -EPROTONOSUPPORT; 993 p9_debug(P9_DEBUG_ERROR, 994 "No transport defined or default transport\n"); 995 goto free_client; 996 } 997 998 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 999 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1000 1001 err = clnt->trans_mod->create(clnt, dev_name, options); 1002 if (err) 1003 goto put_trans; 1004 1005 if (clnt->msize > clnt->trans_mod->maxsize) { 1006 clnt->msize = clnt->trans_mod->maxsize; 1007 pr_info("Limiting 'msize' to %d as this is the maximum " 1008 "supported by transport %s\n", 1009 clnt->msize, clnt->trans_mod->name 1010 ); 1011 } 1012 1013 if (clnt->msize < 4096) { 1014 p9_debug(P9_DEBUG_ERROR, 1015 "Please specify a msize of at least 4k\n"); 1016 err = -EINVAL; 1017 goto close_trans; 1018 } 1019 1020 err = p9_client_version(clnt); 1021 if (err) 1022 goto close_trans; 1023 1024 /* P9_HDRSZ + 4 is the smallest packet header we can have that is 1025 * followed by data accessed from userspace by read 1026 */ 1027 clnt->fcall_cache = 1028 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, 1029 0, 0, P9_HDRSZ + 4, 1030 clnt->msize - (P9_HDRSZ + 4), 1031 NULL); 1032 1033 return clnt; 1034 1035 close_trans: 1036 clnt->trans_mod->close(clnt); 1037 put_trans: 1038 v9fs_put_trans(clnt->trans_mod); 1039 free_client: 1040 kfree(clnt); 1041 return ERR_PTR(err); 1042 } 1043 EXPORT_SYMBOL(p9_client_create); 1044 1045 void p9_client_destroy(struct p9_client *clnt) 1046 { 1047 struct p9_fid *fid; 1048 int id; 1049 1050 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1051 1052 if (clnt->trans_mod) 1053 clnt->trans_mod->close(clnt); 1054 1055 v9fs_put_trans(clnt->trans_mod); 1056 1057 idr_for_each_entry(&clnt->fids, fid, id) { 1058 pr_info("Found fid %d not clunked\n", fid->fid); 1059 p9_fid_destroy(fid); 1060 } 1061 1062 p9_tag_cleanup(clnt); 1063 1064 kmem_cache_destroy(clnt->fcall_cache); 1065 kfree(clnt); 1066 } 1067 EXPORT_SYMBOL(p9_client_destroy); 1068 1069 void p9_client_disconnect(struct p9_client *clnt) 1070 { 1071 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1072 clnt->status = Disconnected; 1073 } 1074 EXPORT_SYMBOL(p9_client_disconnect); 1075 1076 void p9_client_begin_disconnect(struct p9_client *clnt) 1077 { 1078 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1079 clnt->status = BeginDisconnect; 1080 } 1081 EXPORT_SYMBOL(p9_client_begin_disconnect); 1082 1083 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1084 const char *uname, kuid_t n_uname, 1085 const char *aname) 1086 { 1087 int err = 0; 1088 struct p9_req_t *req; 1089 struct p9_fid *fid; 1090 struct p9_qid qid; 1091 1092 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1093 afid ? afid->fid : -1, uname, aname); 1094 fid = p9_fid_create(clnt); 1095 if (!fid) { 1096 err = -ENOMEM; 1097 goto error; 1098 } 1099 fid->uid = n_uname; 1100 1101 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1102 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1103 if (IS_ERR(req)) { 1104 err = PTR_ERR(req); 1105 goto error; 1106 } 1107 1108 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); 1109 if (err) { 1110 trace_9p_protocol_dump(clnt, &req->rc); 1111 p9_req_put(clnt, req); 1112 goto error; 1113 } 1114 1115 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1116 qid.type, qid.path, qid.version); 1117 1118 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1119 1120 p9_req_put(clnt, req); 1121 return fid; 1122 1123 error: 1124 if (fid) 1125 p9_fid_destroy(fid); 1126 return ERR_PTR(err); 1127 } 1128 EXPORT_SYMBOL(p9_client_attach); 1129 1130 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1131 const unsigned char * const *wnames, int clone) 1132 { 1133 int err; 1134 struct p9_client *clnt; 1135 struct p9_fid *fid; 1136 struct p9_qid *wqids; 1137 struct p9_req_t *req; 1138 u16 nwqids, count; 1139 1140 err = 0; 1141 wqids = NULL; 1142 clnt = oldfid->clnt; 1143 if (clone) { 1144 fid = p9_fid_create(clnt); 1145 if (!fid) { 1146 err = -ENOMEM; 1147 goto error; 1148 } 1149 1150 fid->uid = oldfid->uid; 1151 } else { 1152 fid = oldfid; 1153 } 1154 1155 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1156 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1157 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1158 nwname, wnames); 1159 if (IS_ERR(req)) { 1160 err = PTR_ERR(req); 1161 goto error; 1162 } 1163 1164 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1165 if (err) { 1166 trace_9p_protocol_dump(clnt, &req->rc); 1167 p9_req_put(clnt, req); 1168 goto clunk_fid; 1169 } 1170 p9_req_put(clnt, req); 1171 1172 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1173 1174 if (nwqids != nwname) { 1175 err = -ENOENT; 1176 goto clunk_fid; 1177 } 1178 1179 for (count = 0; count < nwqids; count++) 1180 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1181 count, wqids[count].type, 1182 wqids[count].path, 1183 wqids[count].version); 1184 1185 if (nwname) 1186 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1187 else 1188 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); 1189 1190 kfree(wqids); 1191 return fid; 1192 1193 clunk_fid: 1194 kfree(wqids); 1195 p9_fid_put(fid); 1196 fid = NULL; 1197 1198 error: 1199 if (fid && fid != oldfid) 1200 p9_fid_destroy(fid); 1201 1202 return ERR_PTR(err); 1203 } 1204 EXPORT_SYMBOL(p9_client_walk); 1205 1206 int p9_client_open(struct p9_fid *fid, int mode) 1207 { 1208 int err; 1209 struct p9_client *clnt; 1210 struct p9_req_t *req; 1211 struct p9_qid qid; 1212 int iounit; 1213 1214 clnt = fid->clnt; 1215 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1216 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1217 err = 0; 1218 1219 if (fid->mode != -1) 1220 return -EINVAL; 1221 1222 if (p9_is_proto_dotl(clnt)) 1223 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1224 else 1225 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1226 if (IS_ERR(req)) { 1227 err = PTR_ERR(req); 1228 goto error; 1229 } 1230 1231 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1232 if (err) { 1233 trace_9p_protocol_dump(clnt, &req->rc); 1234 goto free_and_error; 1235 } 1236 1237 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1238 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1239 qid.path, qid.version, iounit); 1240 1241 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1242 fid->mode = mode; 1243 fid->iounit = iounit; 1244 1245 free_and_error: 1246 p9_req_put(clnt, req); 1247 error: 1248 return err; 1249 } 1250 EXPORT_SYMBOL(p9_client_open); 1251 1252 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, 1253 u32 mode, kgid_t gid, struct p9_qid *qid) 1254 { 1255 int err = 0; 1256 struct p9_client *clnt; 1257 struct p9_req_t *req; 1258 int iounit; 1259 1260 p9_debug(P9_DEBUG_9P, 1261 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1262 ofid->fid, name, flags, mode, 1263 from_kgid(&init_user_ns, gid)); 1264 clnt = ofid->clnt; 1265 1266 if (ofid->mode != -1) 1267 return -EINVAL; 1268 1269 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1270 mode, gid); 1271 if (IS_ERR(req)) { 1272 err = PTR_ERR(req); 1273 goto error; 1274 } 1275 1276 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); 1277 if (err) { 1278 trace_9p_protocol_dump(clnt, &req->rc); 1279 goto free_and_error; 1280 } 1281 1282 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1283 qid->type, qid->path, qid->version, iounit); 1284 1285 memmove(&ofid->qid, qid, sizeof(struct p9_qid)); 1286 ofid->mode = mode; 1287 ofid->iounit = iounit; 1288 1289 free_and_error: 1290 p9_req_put(clnt, req); 1291 error: 1292 return err; 1293 } 1294 EXPORT_SYMBOL(p9_client_create_dotl); 1295 1296 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1297 char *extension) 1298 { 1299 int err; 1300 struct p9_client *clnt; 1301 struct p9_req_t *req; 1302 struct p9_qid qid; 1303 int iounit; 1304 1305 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1306 fid->fid, name, perm, mode); 1307 err = 0; 1308 clnt = fid->clnt; 1309 1310 if (fid->mode != -1) 1311 return -EINVAL; 1312 1313 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1314 mode, extension); 1315 if (IS_ERR(req)) { 1316 err = PTR_ERR(req); 1317 goto error; 1318 } 1319 1320 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1321 if (err) { 1322 trace_9p_protocol_dump(clnt, &req->rc); 1323 goto free_and_error; 1324 } 1325 1326 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1327 qid.type, qid.path, qid.version, iounit); 1328 1329 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1330 fid->mode = mode; 1331 fid->iounit = iounit; 1332 1333 free_and_error: 1334 p9_req_put(clnt, req); 1335 error: 1336 return err; 1337 } 1338 EXPORT_SYMBOL(p9_client_fcreate); 1339 1340 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1341 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1342 { 1343 int err = 0; 1344 struct p9_client *clnt; 1345 struct p9_req_t *req; 1346 1347 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1348 dfid->fid, name, symtgt); 1349 clnt = dfid->clnt; 1350 1351 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1352 gid); 1353 if (IS_ERR(req)) { 1354 err = PTR_ERR(req); 1355 goto error; 1356 } 1357 1358 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 1359 if (err) { 1360 trace_9p_protocol_dump(clnt, &req->rc); 1361 goto free_and_error; 1362 } 1363 1364 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1365 qid->type, qid->path, qid->version); 1366 1367 free_and_error: 1368 p9_req_put(clnt, req); 1369 error: 1370 return err; 1371 } 1372 EXPORT_SYMBOL(p9_client_symlink); 1373 1374 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1375 { 1376 struct p9_client *clnt; 1377 struct p9_req_t *req; 1378 1379 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1380 dfid->fid, oldfid->fid, newname); 1381 clnt = dfid->clnt; 1382 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1383 newname); 1384 if (IS_ERR(req)) 1385 return PTR_ERR(req); 1386 1387 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1388 p9_req_put(clnt, req); 1389 return 0; 1390 } 1391 EXPORT_SYMBOL(p9_client_link); 1392 1393 int p9_client_fsync(struct p9_fid *fid, int datasync) 1394 { 1395 int err; 1396 struct p9_client *clnt; 1397 struct p9_req_t *req; 1398 1399 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1400 fid->fid, datasync); 1401 err = 0; 1402 clnt = fid->clnt; 1403 1404 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1405 if (IS_ERR(req)) { 1406 err = PTR_ERR(req); 1407 goto error; 1408 } 1409 1410 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1411 1412 p9_req_put(clnt, req); 1413 1414 error: 1415 return err; 1416 } 1417 EXPORT_SYMBOL(p9_client_fsync); 1418 1419 int p9_client_clunk(struct p9_fid *fid) 1420 { 1421 int err; 1422 struct p9_client *clnt; 1423 struct p9_req_t *req; 1424 int retries = 0; 1425 1426 again: 1427 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", 1428 fid->fid, retries); 1429 err = 0; 1430 clnt = fid->clnt; 1431 1432 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1433 if (IS_ERR(req)) { 1434 err = PTR_ERR(req); 1435 goto error; 1436 } 1437 1438 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1439 1440 p9_req_put(clnt, req); 1441 error: 1442 /* Fid is not valid even after a failed clunk 1443 * If interrupted, retry once then give up and 1444 * leak fid until umount. 1445 */ 1446 if (err == -ERESTARTSYS) { 1447 if (retries++ == 0) 1448 goto again; 1449 } else { 1450 p9_fid_destroy(fid); 1451 } 1452 return err; 1453 } 1454 EXPORT_SYMBOL(p9_client_clunk); 1455 1456 int p9_client_remove(struct p9_fid *fid) 1457 { 1458 int err; 1459 struct p9_client *clnt; 1460 struct p9_req_t *req; 1461 1462 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1463 err = 0; 1464 clnt = fid->clnt; 1465 1466 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1467 if (IS_ERR(req)) { 1468 err = PTR_ERR(req); 1469 goto error; 1470 } 1471 1472 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1473 1474 p9_req_put(clnt, req); 1475 error: 1476 if (err == -ERESTARTSYS) 1477 p9_fid_put(fid); 1478 else 1479 p9_fid_destroy(fid); 1480 return err; 1481 } 1482 EXPORT_SYMBOL(p9_client_remove); 1483 1484 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1485 { 1486 int err = 0; 1487 struct p9_req_t *req; 1488 struct p9_client *clnt; 1489 1490 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1491 dfid->fid, name, flags); 1492 1493 clnt = dfid->clnt; 1494 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1495 if (IS_ERR(req)) { 1496 err = PTR_ERR(req); 1497 goto error; 1498 } 1499 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1500 1501 p9_req_put(clnt, req); 1502 error: 1503 return err; 1504 } 1505 EXPORT_SYMBOL(p9_client_unlinkat); 1506 1507 int 1508 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1509 { 1510 int total = 0; 1511 *err = 0; 1512 1513 while (iov_iter_count(to)) { 1514 int count; 1515 1516 count = p9_client_read_once(fid, offset, to, err); 1517 if (!count || *err) 1518 break; 1519 offset += count; 1520 total += count; 1521 } 1522 return total; 1523 } 1524 EXPORT_SYMBOL(p9_client_read); 1525 1526 int 1527 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, 1528 int *err) 1529 { 1530 struct p9_client *clnt = fid->clnt; 1531 struct p9_req_t *req; 1532 int count = iov_iter_count(to); 1533 int rsize, received, non_zc = 0; 1534 char *dataptr; 1535 1536 *err = 0; 1537 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n", 1538 fid->fid, offset, iov_iter_count(to)); 1539 1540 rsize = fid->iounit; 1541 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1542 rsize = clnt->msize - P9_IOHDRSZ; 1543 1544 if (count < rsize) 1545 rsize = count; 1546 1547 /* Don't bother zerocopy for small IO (< 1024) */ 1548 if (clnt->trans_mod->zc_request && rsize > 1024) { 1549 /* response header len is 11 1550 * PDU Header(7) + IO Size (4) 1551 */ 1552 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1553 0, 11, "dqd", fid->fid, 1554 offset, rsize); 1555 } else { 1556 non_zc = 1; 1557 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1558 rsize); 1559 } 1560 if (IS_ERR(req)) { 1561 *err = PTR_ERR(req); 1562 if (!non_zc) 1563 iov_iter_revert(to, count - iov_iter_count(to)); 1564 return 0; 1565 } 1566 1567 *err = p9pdu_readf(&req->rc, clnt->proto_version, 1568 "D", &received, &dataptr); 1569 if (*err) { 1570 if (!non_zc) 1571 iov_iter_revert(to, count - iov_iter_count(to)); 1572 trace_9p_protocol_dump(clnt, &req->rc); 1573 p9_req_put(clnt, req); 1574 return 0; 1575 } 1576 if (rsize < received) { 1577 pr_err("bogus RREAD count (%d > %d)\n", received, rsize); 1578 received = rsize; 1579 } 1580 1581 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1582 1583 if (non_zc) { 1584 int n = copy_to_iter(dataptr, received, to); 1585 1586 if (n != received) { 1587 *err = -EFAULT; 1588 p9_req_put(clnt, req); 1589 return n; 1590 } 1591 } else { 1592 iov_iter_revert(to, count - received - iov_iter_count(to)); 1593 } 1594 p9_req_put(clnt, req); 1595 return received; 1596 } 1597 EXPORT_SYMBOL(p9_client_read_once); 1598 1599 int 1600 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1601 { 1602 struct p9_client *clnt = fid->clnt; 1603 struct p9_req_t *req; 1604 int total = 0; 1605 *err = 0; 1606 1607 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", 1608 fid->fid, offset, iov_iter_count(from)); 1609 1610 while (iov_iter_count(from)) { 1611 int count = iov_iter_count(from); 1612 int rsize = fid->iounit; 1613 int written; 1614 1615 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1616 rsize = clnt->msize - P9_IOHDRSZ; 1617 1618 if (count < rsize) 1619 rsize = count; 1620 1621 /* Don't bother zerocopy for small IO (< 1024) */ 1622 if (clnt->trans_mod->zc_request && rsize > 1024) { 1623 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1624 rsize, P9_ZC_HDR_SZ, "dqd", 1625 fid->fid, offset, rsize); 1626 } else { 1627 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1628 offset, rsize, from); 1629 } 1630 if (IS_ERR(req)) { 1631 iov_iter_revert(from, count - iov_iter_count(from)); 1632 *err = PTR_ERR(req); 1633 break; 1634 } 1635 1636 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written); 1637 if (*err) { 1638 iov_iter_revert(from, count - iov_iter_count(from)); 1639 trace_9p_protocol_dump(clnt, &req->rc); 1640 p9_req_put(clnt, req); 1641 break; 1642 } 1643 if (rsize < written) { 1644 pr_err("bogus RWRITE count (%d > %d)\n", written, rsize); 1645 written = rsize; 1646 } 1647 1648 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1649 1650 p9_req_put(clnt, req); 1651 iov_iter_revert(from, count - written - iov_iter_count(from)); 1652 total += written; 1653 offset += written; 1654 } 1655 return total; 1656 } 1657 EXPORT_SYMBOL(p9_client_write); 1658 1659 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1660 { 1661 int err; 1662 struct p9_client *clnt; 1663 struct p9_wstat *ret; 1664 struct p9_req_t *req; 1665 u16 ignored; 1666 1667 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1668 1669 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1670 if (!ret) 1671 return ERR_PTR(-ENOMEM); 1672 1673 err = 0; 1674 clnt = fid->clnt; 1675 1676 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1677 if (IS_ERR(req)) { 1678 err = PTR_ERR(req); 1679 goto error; 1680 } 1681 1682 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); 1683 if (err) { 1684 trace_9p_protocol_dump(clnt, &req->rc); 1685 p9_req_put(clnt, req); 1686 goto error; 1687 } 1688 1689 p9_debug(P9_DEBUG_9P, 1690 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1691 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1692 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1693 "<<< uid=%d gid=%d n_muid=%d\n", 1694 ret->size, ret->type, ret->dev, ret->qid.type, ret->qid.path, 1695 ret->qid.version, ret->mode, 1696 ret->atime, ret->mtime, ret->length, 1697 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1698 from_kuid(&init_user_ns, ret->n_uid), 1699 from_kgid(&init_user_ns, ret->n_gid), 1700 from_kuid(&init_user_ns, ret->n_muid)); 1701 1702 p9_req_put(clnt, req); 1703 return ret; 1704 1705 error: 1706 kfree(ret); 1707 return ERR_PTR(err); 1708 } 1709 EXPORT_SYMBOL(p9_client_stat); 1710 1711 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1712 u64 request_mask) 1713 { 1714 int err; 1715 struct p9_client *clnt; 1716 struct p9_stat_dotl *ret; 1717 struct p9_req_t *req; 1718 1719 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1720 fid->fid, request_mask); 1721 1722 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1723 if (!ret) 1724 return ERR_PTR(-ENOMEM); 1725 1726 err = 0; 1727 clnt = fid->clnt; 1728 1729 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1730 if (IS_ERR(req)) { 1731 err = PTR_ERR(req); 1732 goto error; 1733 } 1734 1735 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); 1736 if (err) { 1737 trace_9p_protocol_dump(clnt, &req->rc); 1738 p9_req_put(clnt, req); 1739 goto error; 1740 } 1741 1742 p9_debug(P9_DEBUG_9P, "<<< RGETATTR st_result_mask=%lld\n" 1743 "<<< qid=%x.%llx.%x\n" 1744 "<<< st_mode=%8.8x st_nlink=%llu\n" 1745 "<<< st_uid=%d st_gid=%d\n" 1746 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1747 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1748 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1749 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1750 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1751 "<<< st_gen=%lld st_data_version=%lld\n", 1752 ret->st_result_mask, 1753 ret->qid.type, ret->qid.path, ret->qid.version, 1754 ret->st_mode, ret->st_nlink, 1755 from_kuid(&init_user_ns, ret->st_uid), 1756 from_kgid(&init_user_ns, ret->st_gid), 1757 ret->st_rdev, ret->st_size, ret->st_blksize, ret->st_blocks, 1758 ret->st_atime_sec, ret->st_atime_nsec, 1759 ret->st_mtime_sec, ret->st_mtime_nsec, 1760 ret->st_ctime_sec, ret->st_ctime_nsec, 1761 ret->st_btime_sec, ret->st_btime_nsec, 1762 ret->st_gen, ret->st_data_version); 1763 1764 p9_req_put(clnt, req); 1765 return ret; 1766 1767 error: 1768 kfree(ret); 1769 return ERR_PTR(err); 1770 } 1771 EXPORT_SYMBOL(p9_client_getattr_dotl); 1772 1773 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1774 { 1775 int ret; 1776 1777 /* NOTE: size shouldn't include its own length */ 1778 /* size[2] type[2] dev[4] qid[13] */ 1779 /* mode[4] atime[4] mtime[4] length[8]*/ 1780 /* name[s] uid[s] gid[s] muid[s] */ 1781 ret = 2 + 4 + 13 + 4 + 4 + 4 + 8 + 2 + 2 + 2 + 2; 1782 1783 if (wst->name) 1784 ret += strlen(wst->name); 1785 if (wst->uid) 1786 ret += strlen(wst->uid); 1787 if (wst->gid) 1788 ret += strlen(wst->gid); 1789 if (wst->muid) 1790 ret += strlen(wst->muid); 1791 1792 if (proto_version == p9_proto_2000u || 1793 proto_version == p9_proto_2000L) { 1794 /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1795 ret += 2 + 4 + 4 + 4; 1796 if (wst->extension) 1797 ret += strlen(wst->extension); 1798 } 1799 1800 return ret; 1801 } 1802 1803 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1804 { 1805 int err; 1806 struct p9_req_t *req; 1807 struct p9_client *clnt; 1808 1809 err = 0; 1810 clnt = fid->clnt; 1811 wst->size = p9_client_statsize(wst, clnt->proto_version); 1812 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", 1813 fid->fid); 1814 p9_debug(P9_DEBUG_9P, 1815 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1816 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1817 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1818 " uid=%d gid=%d n_muid=%d\n", 1819 wst->size, wst->type, wst->dev, wst->qid.type, 1820 wst->qid.path, wst->qid.version, 1821 wst->mode, wst->atime, wst->mtime, wst->length, 1822 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1823 from_kuid(&init_user_ns, wst->n_uid), 1824 from_kgid(&init_user_ns, wst->n_gid), 1825 from_kuid(&init_user_ns, wst->n_muid)); 1826 1827 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", 1828 fid->fid, wst->size + 2, wst); 1829 if (IS_ERR(req)) { 1830 err = PTR_ERR(req); 1831 goto error; 1832 } 1833 1834 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1835 1836 p9_req_put(clnt, req); 1837 error: 1838 return err; 1839 } 1840 EXPORT_SYMBOL(p9_client_wstat); 1841 1842 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1843 { 1844 int err; 1845 struct p9_req_t *req; 1846 struct p9_client *clnt; 1847 1848 err = 0; 1849 clnt = fid->clnt; 1850 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1851 p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n", 1852 p9attr->valid, p9attr->mode, 1853 from_kuid(&init_user_ns, p9attr->uid), 1854 from_kgid(&init_user_ns, p9attr->gid), 1855 p9attr->size); 1856 p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n", 1857 p9attr->atime_sec, p9attr->atime_nsec); 1858 p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n", 1859 p9attr->mtime_sec, p9attr->mtime_nsec); 1860 1861 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1862 1863 if (IS_ERR(req)) { 1864 err = PTR_ERR(req); 1865 goto error; 1866 } 1867 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1868 p9_req_put(clnt, req); 1869 error: 1870 return err; 1871 } 1872 EXPORT_SYMBOL(p9_client_setattr); 1873 1874 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1875 { 1876 int err; 1877 struct p9_req_t *req; 1878 struct p9_client *clnt; 1879 1880 err = 0; 1881 clnt = fid->clnt; 1882 1883 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1884 1885 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1886 if (IS_ERR(req)) { 1887 err = PTR_ERR(req); 1888 goto error; 1889 } 1890 1891 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1892 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1893 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1894 if (err) { 1895 trace_9p_protocol_dump(clnt, &req->rc); 1896 p9_req_put(clnt, req); 1897 goto error; 1898 } 1899 1900 p9_debug(P9_DEBUG_9P, 1901 "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n", 1902 fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree, 1903 sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen); 1904 1905 p9_req_put(clnt, req); 1906 error: 1907 return err; 1908 } 1909 EXPORT_SYMBOL(p9_client_statfs); 1910 1911 int p9_client_rename(struct p9_fid *fid, 1912 struct p9_fid *newdirfid, const char *name) 1913 { 1914 int err; 1915 struct p9_req_t *req; 1916 struct p9_client *clnt; 1917 1918 err = 0; 1919 clnt = fid->clnt; 1920 1921 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1922 fid->fid, newdirfid->fid, name); 1923 1924 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1925 newdirfid->fid, name); 1926 if (IS_ERR(req)) { 1927 err = PTR_ERR(req); 1928 goto error; 1929 } 1930 1931 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1932 1933 p9_req_put(clnt, req); 1934 error: 1935 return err; 1936 } 1937 EXPORT_SYMBOL(p9_client_rename); 1938 1939 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1940 struct p9_fid *newdirfid, const char *new_name) 1941 { 1942 int err; 1943 struct p9_req_t *req; 1944 struct p9_client *clnt; 1945 1946 err = 0; 1947 clnt = olddirfid->clnt; 1948 1949 p9_debug(P9_DEBUG_9P, 1950 ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n", 1951 olddirfid->fid, old_name, newdirfid->fid, new_name); 1952 1953 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1954 old_name, newdirfid->fid, new_name); 1955 if (IS_ERR(req)) { 1956 err = PTR_ERR(req); 1957 goto error; 1958 } 1959 1960 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1961 newdirfid->fid, new_name); 1962 1963 p9_req_put(clnt, req); 1964 error: 1965 return err; 1966 } 1967 EXPORT_SYMBOL(p9_client_renameat); 1968 1969 /* An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1970 */ 1971 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1972 const char *attr_name, u64 *attr_size) 1973 { 1974 int err; 1975 struct p9_req_t *req; 1976 struct p9_client *clnt; 1977 struct p9_fid *attr_fid; 1978 1979 err = 0; 1980 clnt = file_fid->clnt; 1981 attr_fid = p9_fid_create(clnt); 1982 if (!attr_fid) { 1983 err = -ENOMEM; 1984 goto error; 1985 } 1986 p9_debug(P9_DEBUG_9P, 1987 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 1988 file_fid->fid, attr_fid->fid, attr_name); 1989 1990 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 1991 file_fid->fid, attr_fid->fid, attr_name); 1992 if (IS_ERR(req)) { 1993 err = PTR_ERR(req); 1994 goto error; 1995 } 1996 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); 1997 if (err) { 1998 trace_9p_protocol_dump(clnt, &req->rc); 1999 p9_req_put(clnt, req); 2000 goto clunk_fid; 2001 } 2002 p9_req_put(clnt, req); 2003 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2004 attr_fid->fid, *attr_size); 2005 return attr_fid; 2006 clunk_fid: 2007 p9_fid_put(attr_fid); 2008 attr_fid = NULL; 2009 error: 2010 if (attr_fid && attr_fid != file_fid) 2011 p9_fid_destroy(attr_fid); 2012 2013 return ERR_PTR(err); 2014 } 2015 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2016 2017 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2018 u64 attr_size, int flags) 2019 { 2020 int err; 2021 struct p9_req_t *req; 2022 struct p9_client *clnt; 2023 2024 p9_debug(P9_DEBUG_9P, 2025 ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n", 2026 fid->fid, name, attr_size, flags); 2027 err = 0; 2028 clnt = fid->clnt; 2029 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2030 fid->fid, name, attr_size, flags); 2031 if (IS_ERR(req)) { 2032 err = PTR_ERR(req); 2033 goto error; 2034 } 2035 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2036 p9_req_put(clnt, req); 2037 error: 2038 return err; 2039 } 2040 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2041 2042 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2043 { 2044 int err, rsize, non_zc = 0; 2045 struct p9_client *clnt; 2046 struct p9_req_t *req; 2047 char *dataptr; 2048 struct kvec kv = {.iov_base = data, .iov_len = count}; 2049 struct iov_iter to; 2050 2051 iov_iter_kvec(&to, READ, &kv, 1, count); 2052 2053 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2054 fid->fid, offset, count); 2055 2056 err = 0; 2057 clnt = fid->clnt; 2058 2059 rsize = fid->iounit; 2060 if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ) 2061 rsize = clnt->msize - P9_READDIRHDRSZ; 2062 2063 if (count < rsize) 2064 rsize = count; 2065 2066 /* Don't bother zerocopy for small IO (< 1024) */ 2067 if (clnt->trans_mod->zc_request && rsize > 1024) { 2068 /* response header len is 11 2069 * PDU Header(7) + IO Size (4) 2070 */ 2071 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2072 11, "dqd", fid->fid, offset, rsize); 2073 } else { 2074 non_zc = 1; 2075 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2076 offset, rsize); 2077 } 2078 if (IS_ERR(req)) { 2079 err = PTR_ERR(req); 2080 goto error; 2081 } 2082 2083 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); 2084 if (err) { 2085 trace_9p_protocol_dump(clnt, &req->rc); 2086 goto free_and_error; 2087 } 2088 if (rsize < count) { 2089 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2090 count = rsize; 2091 } 2092 2093 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2094 2095 if (non_zc) 2096 memmove(data, dataptr, count); 2097 2098 p9_req_put(clnt, req); 2099 return count; 2100 2101 free_and_error: 2102 p9_req_put(clnt, req); 2103 error: 2104 return err; 2105 } 2106 EXPORT_SYMBOL(p9_client_readdir); 2107 2108 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2109 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2110 { 2111 int err; 2112 struct p9_client *clnt; 2113 struct p9_req_t *req; 2114 2115 err = 0; 2116 clnt = fid->clnt; 2117 p9_debug(P9_DEBUG_9P, 2118 ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n", 2119 fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2120 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2121 MAJOR(rdev), MINOR(rdev), gid); 2122 if (IS_ERR(req)) 2123 return PTR_ERR(req); 2124 2125 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2126 if (err) { 2127 trace_9p_protocol_dump(clnt, &req->rc); 2128 goto error; 2129 } 2130 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", 2131 qid->type, qid->path, qid->version); 2132 2133 error: 2134 p9_req_put(clnt, req); 2135 return err; 2136 } 2137 EXPORT_SYMBOL(p9_client_mknod_dotl); 2138 2139 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2140 kgid_t gid, struct p9_qid *qid) 2141 { 2142 int err; 2143 struct p9_client *clnt; 2144 struct p9_req_t *req; 2145 2146 err = 0; 2147 clnt = fid->clnt; 2148 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2149 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2150 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", 2151 fid->fid, name, mode, gid); 2152 if (IS_ERR(req)) 2153 return PTR_ERR(req); 2154 2155 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2156 if (err) { 2157 trace_9p_protocol_dump(clnt, &req->rc); 2158 goto error; 2159 } 2160 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2161 qid->path, qid->version); 2162 2163 error: 2164 p9_req_put(clnt, req); 2165 return err; 2166 } 2167 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2168 2169 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2170 { 2171 int err; 2172 struct p9_client *clnt; 2173 struct p9_req_t *req; 2174 2175 err = 0; 2176 clnt = fid->clnt; 2177 p9_debug(P9_DEBUG_9P, 2178 ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n", 2179 fid->fid, flock->type, flock->flags, flock->start, 2180 flock->length, flock->proc_id, flock->client_id); 2181 2182 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2183 flock->flags, flock->start, flock->length, 2184 flock->proc_id, flock->client_id); 2185 2186 if (IS_ERR(req)) 2187 return PTR_ERR(req); 2188 2189 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); 2190 if (err) { 2191 trace_9p_protocol_dump(clnt, &req->rc); 2192 goto error; 2193 } 2194 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2195 error: 2196 p9_req_put(clnt, req); 2197 return err; 2198 } 2199 EXPORT_SYMBOL(p9_client_lock_dotl); 2200 2201 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2202 { 2203 int err; 2204 struct p9_client *clnt; 2205 struct p9_req_t *req; 2206 2207 err = 0; 2208 clnt = fid->clnt; 2209 p9_debug(P9_DEBUG_9P, 2210 ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n", 2211 fid->fid, glock->type, glock->start, glock->length, 2212 glock->proc_id, glock->client_id); 2213 2214 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, 2215 glock->type, glock->start, glock->length, 2216 glock->proc_id, glock->client_id); 2217 2218 if (IS_ERR(req)) 2219 return PTR_ERR(req); 2220 2221 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, 2222 &glock->start, &glock->length, &glock->proc_id, 2223 &glock->client_id); 2224 if (err) { 2225 trace_9p_protocol_dump(clnt, &req->rc); 2226 goto error; 2227 } 2228 p9_debug(P9_DEBUG_9P, 2229 "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n", 2230 glock->type, glock->start, glock->length, 2231 glock->proc_id, glock->client_id); 2232 error: 2233 p9_req_put(clnt, req); 2234 return err; 2235 } 2236 EXPORT_SYMBOL(p9_client_getlock_dotl); 2237 2238 int p9_client_readlink(struct p9_fid *fid, char **target) 2239 { 2240 int err; 2241 struct p9_client *clnt; 2242 struct p9_req_t *req; 2243 2244 err = 0; 2245 clnt = fid->clnt; 2246 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2247 2248 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2249 if (IS_ERR(req)) 2250 return PTR_ERR(req); 2251 2252 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); 2253 if (err) { 2254 trace_9p_protocol_dump(clnt, &req->rc); 2255 goto error; 2256 } 2257 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2258 error: 2259 p9_req_put(clnt, req); 2260 return err; 2261 } 2262 EXPORT_SYMBOL(p9_client_readlink); 2263 2264 int __init p9_client_init(void) 2265 { 2266 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); 2267 return p9_req_cache ? 0 : -ENOMEM; 2268 } 2269 2270 void __exit p9_client_exit(void) 2271 { 2272 kmem_cache_destroy(p9_req_cache); 2273 } 2274