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 /* DEFAULT MSIZE = 32 pages worth of payload + P9_HDRSZ + 32 * room for write (16 extra) or read (11 extra) operands. 33 */ 34 35 #define DEFAULT_MSIZE ((128 * 1024) + P9_IOHDRSZ) 36 37 /* Client Option Parsing (code inspired by NFS code) 38 * - a little lazy - parse all client options 39 */ 40 41 enum { 42 Opt_msize, 43 Opt_trans, 44 Opt_legacy, 45 Opt_version, 46 Opt_err, 47 }; 48 49 static const match_table_t tokens = { 50 {Opt_msize, "msize=%u"}, 51 {Opt_legacy, "noextend"}, 52 {Opt_trans, "trans=%s"}, 53 {Opt_version, "version=%s"}, 54 {Opt_err, NULL}, 55 }; 56 57 inline int p9_is_proto_dotl(struct p9_client *clnt) 58 { 59 return clnt->proto_version == p9_proto_2000L; 60 } 61 EXPORT_SYMBOL(p9_is_proto_dotl); 62 63 inline int p9_is_proto_dotu(struct p9_client *clnt) 64 { 65 return clnt->proto_version == p9_proto_2000u; 66 } 67 EXPORT_SYMBOL(p9_is_proto_dotu); 68 69 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt) 70 { 71 if (clnt->msize != DEFAULT_MSIZE) 72 seq_printf(m, ",msize=%u", clnt->msize); 73 seq_printf(m, ",trans=%s", clnt->trans_mod->name); 74 75 switch (clnt->proto_version) { 76 case p9_proto_legacy: 77 seq_puts(m, ",noextend"); 78 break; 79 case p9_proto_2000u: 80 seq_puts(m, ",version=9p2000.u"); 81 break; 82 case p9_proto_2000L: 83 /* Default */ 84 break; 85 } 86 87 if (clnt->trans_mod->show_options) 88 return clnt->trans_mod->show_options(m, clnt); 89 return 0; 90 } 91 EXPORT_SYMBOL(p9_show_client_options); 92 93 /* Some error codes are taken directly from the server replies, 94 * make sure they are valid. 95 */ 96 static int safe_errno(int err) 97 { 98 if (err > 0 || err < -MAX_ERRNO) { 99 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err); 100 return -EPROTO; 101 } 102 return err; 103 } 104 105 /* Interpret mount option for protocol version */ 106 static int get_protocol_version(char *s) 107 { 108 int version = -EINVAL; 109 110 if (!strcmp(s, "9p2000")) { 111 version = p9_proto_legacy; 112 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n"); 113 } else if (!strcmp(s, "9p2000.u")) { 114 version = p9_proto_2000u; 115 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); 116 } else if (!strcmp(s, "9p2000.L")) { 117 version = p9_proto_2000L; 118 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); 119 } else { 120 pr_info("Unknown protocol version %s\n", s); 121 } 122 123 return version; 124 } 125 126 /** 127 * parse_opts - parse mount options into client structure 128 * @opts: options string passed from mount 129 * @clnt: existing v9fs client information 130 * 131 * Return 0 upon success, -ERRNO upon failure 132 */ 133 134 static int parse_opts(char *opts, struct p9_client *clnt) 135 { 136 char *options, *tmp_options; 137 char *p; 138 substring_t args[MAX_OPT_ARGS]; 139 int option; 140 char *s; 141 int ret = 0; 142 143 clnt->proto_version = p9_proto_2000L; 144 clnt->msize = DEFAULT_MSIZE; 145 146 if (!opts) 147 return 0; 148 149 tmp_options = kstrdup(opts, GFP_KERNEL); 150 if (!tmp_options) 151 return -ENOMEM; 152 options = tmp_options; 153 154 while ((p = strsep(&options, ",")) != NULL) { 155 int token, r; 156 157 if (!*p) 158 continue; 159 token = match_token(p, tokens, args); 160 switch (token) { 161 case Opt_msize: 162 r = match_int(&args[0], &option); 163 if (r < 0) { 164 p9_debug(P9_DEBUG_ERROR, 165 "integer field, but no integer?\n"); 166 ret = r; 167 continue; 168 } 169 if (option < 4096) { 170 p9_debug(P9_DEBUG_ERROR, 171 "msize should be at least 4k\n"); 172 ret = -EINVAL; 173 continue; 174 } 175 clnt->msize = option; 176 break; 177 case Opt_trans: 178 s = match_strdup(&args[0]); 179 if (!s) { 180 ret = -ENOMEM; 181 p9_debug(P9_DEBUG_ERROR, 182 "problem allocating copy of trans arg\n"); 183 goto free_and_return; 184 } 185 186 v9fs_put_trans(clnt->trans_mod); 187 clnt->trans_mod = v9fs_get_trans_by_name(s); 188 if (!clnt->trans_mod) { 189 pr_info("Could not find request transport: %s\n", 190 s); 191 ret = -EINVAL; 192 } 193 kfree(s); 194 break; 195 case Opt_legacy: 196 clnt->proto_version = p9_proto_legacy; 197 break; 198 case Opt_version: 199 s = match_strdup(&args[0]); 200 if (!s) { 201 ret = -ENOMEM; 202 p9_debug(P9_DEBUG_ERROR, 203 "problem allocating copy of version arg\n"); 204 goto free_and_return; 205 } 206 r = get_protocol_version(s); 207 if (r < 0) 208 ret = r; 209 else 210 clnt->proto_version = r; 211 kfree(s); 212 break; 213 default: 214 continue; 215 } 216 } 217 218 free_and_return: 219 if (ret) 220 v9fs_put_trans(clnt->trans_mod); 221 kfree(tmp_options); 222 return ret; 223 } 224 225 static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc, 226 int alloc_msize) 227 { 228 if (likely(c->fcall_cache) && alloc_msize == c->msize) { 229 fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS); 230 fc->cache = c->fcall_cache; 231 } else { 232 fc->sdata = kmalloc(alloc_msize, GFP_NOFS); 233 fc->cache = NULL; 234 } 235 if (!fc->sdata) 236 return -ENOMEM; 237 fc->capacity = alloc_msize; 238 return 0; 239 } 240 241 void p9_fcall_fini(struct p9_fcall *fc) 242 { 243 /* sdata can be NULL for interrupted requests in trans_rdma, 244 * and kmem_cache_free does not do NULL-check for us 245 */ 246 if (unlikely(!fc->sdata)) 247 return; 248 249 if (fc->cache) 250 kmem_cache_free(fc->cache, fc->sdata); 251 else 252 kfree(fc->sdata); 253 } 254 EXPORT_SYMBOL(p9_fcall_fini); 255 256 static struct kmem_cache *p9_req_cache; 257 258 /** 259 * p9_tag_alloc - Allocate a new request. 260 * @c: Client session. 261 * @type: Transaction type. 262 * @t_size: Buffer size for holding this request 263 * (automatic calculation by format template if 0). 264 * @r_size: Buffer size for holding server's reply on this request 265 * (automatic calculation by format template if 0). 266 * @fmt: Format template for assembling 9p request message 267 * (see p9pdu_vwritef). 268 * @ap: Variable arguments to be fed to passed format template 269 * (see p9pdu_vwritef). 270 * 271 * Context: Process context. 272 * Return: Pointer to new request. 273 */ 274 static struct p9_req_t * 275 p9_tag_alloc(struct p9_client *c, int8_t type, uint t_size, uint r_size, 276 const char *fmt, va_list ap) 277 { 278 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); 279 int alloc_tsize; 280 int alloc_rsize; 281 int tag; 282 va_list apc; 283 284 va_copy(apc, ap); 285 alloc_tsize = min_t(size_t, c->msize, 286 t_size ?: p9_msg_buf_size(c, type, fmt, apc)); 287 va_end(apc); 288 289 alloc_rsize = min_t(size_t, c->msize, 290 r_size ?: p9_msg_buf_size(c, type + 1, fmt, ap)); 291 292 if (!req) 293 return ERR_PTR(-ENOMEM); 294 295 if (p9_fcall_init(c, &req->tc, alloc_tsize)) 296 goto free_req; 297 if (p9_fcall_init(c, &req->rc, alloc_rsize)) 298 goto free; 299 300 p9pdu_reset(&req->tc); 301 p9pdu_reset(&req->rc); 302 req->t_err = 0; 303 req->status = REQ_STATUS_ALLOC; 304 /* refcount needs to be set to 0 before inserting into the idr 305 * so p9_tag_lookup does not accept a request that is not fully 306 * initialized. refcount_set to 2 below will mark request ready. 307 */ 308 refcount_set(&req->refcount, 0); 309 init_waitqueue_head(&req->wq); 310 INIT_LIST_HEAD(&req->req_list); 311 312 idr_preload(GFP_NOFS); 313 spin_lock_irq(&c->lock); 314 if (type == P9_TVERSION) 315 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1, 316 GFP_NOWAIT); 317 else 318 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT); 319 req->tc.tag = tag; 320 spin_unlock_irq(&c->lock); 321 idr_preload_end(); 322 if (tag < 0) 323 goto free; 324 325 /* Init ref to two because in the general case there is one ref 326 * that is put asynchronously by a writer thread, one ref 327 * temporarily given by p9_tag_lookup and put by p9_client_cb 328 * in the recv thread, and one ref put by p9_req_put in the 329 * main thread. The only exception is virtio that does not use 330 * p9_tag_lookup but does not have a writer thread either 331 * (the write happens synchronously in the request/zc_request 332 * callback), so p9_client_cb eats the second ref there 333 * as the pointer is duplicated directly by virtqueue_add_sgs() 334 */ 335 refcount_set(&req->refcount, 2); 336 337 return req; 338 339 free: 340 p9_fcall_fini(&req->tc); 341 p9_fcall_fini(&req->rc); 342 free_req: 343 kmem_cache_free(p9_req_cache, req); 344 return ERR_PTR(-ENOMEM); 345 } 346 347 /** 348 * p9_tag_lookup - Look up a request by tag. 349 * @c: Client session. 350 * @tag: Transaction ID. 351 * 352 * Context: Any context. 353 * Return: A request, or %NULL if there is no request with that tag. 354 */ 355 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 356 { 357 struct p9_req_t *req; 358 359 rcu_read_lock(); 360 again: 361 req = idr_find(&c->reqs, tag); 362 if (req) { 363 /* We have to be careful with the req found under rcu_read_lock 364 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the 365 * ref again without corrupting other data, then check again 366 * that the tag matches once we have the ref 367 */ 368 if (!p9_req_try_get(req)) 369 goto again; 370 if (req->tc.tag != tag) { 371 p9_req_put(c, req); 372 goto again; 373 } 374 } 375 rcu_read_unlock(); 376 377 return req; 378 } 379 EXPORT_SYMBOL(p9_tag_lookup); 380 381 /** 382 * p9_tag_remove - Remove a tag. 383 * @c: Client session. 384 * @r: Request of reference. 385 * 386 * Context: Any context. 387 */ 388 static void p9_tag_remove(struct p9_client *c, struct p9_req_t *r) 389 { 390 unsigned long flags; 391 u16 tag = r->tc.tag; 392 393 p9_debug(P9_DEBUG_MUX, "freeing clnt %p req %p tag: %d\n", c, r, tag); 394 spin_lock_irqsave(&c->lock, flags); 395 idr_remove(&c->reqs, tag); 396 spin_unlock_irqrestore(&c->lock, flags); 397 } 398 399 int p9_req_put(struct p9_client *c, struct p9_req_t *r) 400 { 401 if (refcount_dec_and_test(&r->refcount)) { 402 p9_tag_remove(c, r); 403 404 p9_fcall_fini(&r->tc); 405 p9_fcall_fini(&r->rc); 406 kmem_cache_free(p9_req_cache, r); 407 return 1; 408 } 409 return 0; 410 } 411 EXPORT_SYMBOL(p9_req_put); 412 413 /** 414 * p9_tag_cleanup - cleans up tags structure and reclaims resources 415 * @c: v9fs client struct 416 * 417 * This frees resources associated with the tags structure 418 * 419 */ 420 static void p9_tag_cleanup(struct p9_client *c) 421 { 422 struct p9_req_t *req; 423 int id; 424 425 rcu_read_lock(); 426 idr_for_each_entry(&c->reqs, req, id) { 427 pr_info("Tag %d still in use\n", id); 428 if (p9_req_put(c, req) == 0) 429 pr_warn("Packet with tag %d has still references", 430 req->tc.tag); 431 } 432 rcu_read_unlock(); 433 } 434 435 /** 436 * p9_client_cb - call back from transport to client 437 * @c: client state 438 * @req: request received 439 * @status: request status, one of REQ_STATUS_* 440 * 441 */ 442 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) 443 { 444 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); 445 446 /* This barrier is needed to make sure any change made to req before 447 * the status change is visible to another thread 448 */ 449 smp_wmb(); 450 WRITE_ONCE(req->status, status); 451 452 wake_up(&req->wq); 453 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); 454 p9_req_put(c, req); 455 } 456 EXPORT_SYMBOL(p9_client_cb); 457 458 /** 459 * p9_parse_header - parse header arguments out of a packet 460 * @pdu: packet to parse 461 * @size: size of packet 462 * @type: type of request 463 * @tag: tag of packet 464 * @rewind: set if we need to rewind offset afterwards 465 */ 466 467 int 468 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, 469 int16_t *tag, int rewind) 470 { 471 s8 r_type; 472 s16 r_tag; 473 s32 r_size; 474 int offset = pdu->offset; 475 int err; 476 477 pdu->offset = 0; 478 479 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 480 if (err) 481 goto rewind_and_exit; 482 483 if (type) 484 *type = r_type; 485 if (tag) 486 *tag = r_tag; 487 if (size) 488 *size = r_size; 489 490 if (pdu->size != r_size || r_size < 7) { 491 err = -EINVAL; 492 goto rewind_and_exit; 493 } 494 495 pdu->id = r_type; 496 pdu->tag = r_tag; 497 498 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 499 pdu->size, pdu->id, pdu->tag); 500 501 rewind_and_exit: 502 if (rewind) 503 pdu->offset = offset; 504 return err; 505 } 506 EXPORT_SYMBOL(p9_parse_header); 507 508 /** 509 * p9_check_errors - check 9p packet for error return and process it 510 * @c: current client instance 511 * @req: request to parse and check for error conditions 512 * 513 * returns error code if one is discovered, otherwise returns 0 514 * 515 * this will have to be more complicated if we have multiple 516 * error packet types 517 */ 518 519 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 520 { 521 s8 type; 522 int err; 523 int ecode; 524 525 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 526 if (req->rc.size > req->rc.capacity && !req->rc.zc) { 527 pr_err("requested packet size too big: %d does not fit %zu (type=%d)\n", 528 req->rc.size, req->rc.capacity, req->rc.id); 529 return -EIO; 530 } 531 /* dump the response from server 532 * This should be after check errors which poplulate pdu_fcall. 533 */ 534 trace_9p_protocol_dump(c, &req->rc); 535 if (err) { 536 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 537 return err; 538 } 539 if (type != P9_RERROR && type != P9_RLERROR) 540 return 0; 541 542 if (!p9_is_proto_dotl(c)) { 543 char *ename; 544 545 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 546 &ename, &ecode); 547 if (err) 548 goto out_err; 549 550 if (p9_is_proto_dotu(c) && ecode < 512) 551 err = -ecode; 552 553 if (!err) { 554 err = p9_errstr2errno(ename, strlen(ename)); 555 556 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 557 -ecode, ename); 558 } 559 kfree(ename); 560 } else { 561 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 562 if (err) 563 goto out_err; 564 err = -ecode; 565 566 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 567 } 568 569 return err; 570 571 out_err: 572 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 573 574 return err; 575 } 576 577 static struct p9_req_t * 578 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 579 580 /** 581 * p9_client_flush - flush (cancel) a request 582 * @c: client state 583 * @oldreq: request to cancel 584 * 585 * This sents a flush for a particular request and links 586 * the flush request to the original request. The current 587 * code only supports a single flush request although the protocol 588 * allows for multiple flush requests to be sent for a single request. 589 * 590 */ 591 592 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 593 { 594 struct p9_req_t *req; 595 s16 oldtag; 596 int err; 597 598 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); 599 if (err) 600 return err; 601 602 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 603 604 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 605 if (IS_ERR(req)) 606 return PTR_ERR(req); 607 608 /* if we haven't received a response for oldreq, 609 * remove it from the list 610 */ 611 if (READ_ONCE(oldreq->status) == REQ_STATUS_SENT) { 612 if (c->trans_mod->cancelled) 613 c->trans_mod->cancelled(c, oldreq); 614 } 615 616 p9_req_put(c, req); 617 return 0; 618 } 619 620 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 621 int8_t type, uint t_size, uint r_size, 622 const char *fmt, va_list ap) 623 { 624 int err; 625 struct p9_req_t *req; 626 va_list apc; 627 628 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 629 630 /* we allow for any status other than disconnected */ 631 if (c->status == Disconnected) 632 return ERR_PTR(-EIO); 633 634 /* if status is begin_disconnected we allow only clunk request */ 635 if (c->status == BeginDisconnect && type != P9_TCLUNK) 636 return ERR_PTR(-EIO); 637 638 va_copy(apc, ap); 639 req = p9_tag_alloc(c, type, t_size, r_size, fmt, apc); 640 va_end(apc); 641 if (IS_ERR(req)) 642 return req; 643 644 /* marshall the data */ 645 p9pdu_prepare(&req->tc, req->tc.tag, type); 646 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); 647 if (err) 648 goto reterr; 649 p9pdu_finalize(c, &req->tc); 650 trace_9p_client_req(c, type, req->tc.tag); 651 return req; 652 reterr: 653 p9_req_put(c, req); 654 /* We have to put also the 2nd reference as it won't be used */ 655 p9_req_put(c, req); 656 return ERR_PTR(err); 657 } 658 659 /** 660 * p9_client_rpc - issue a request and wait for a response 661 * @c: client session 662 * @type: type of request 663 * @fmt: protocol format string (see protocol.c) 664 * 665 * Returns request structure (which client must free using p9_req_put) 666 */ 667 668 static struct p9_req_t * 669 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 670 { 671 va_list ap; 672 int sigpending, err; 673 unsigned long flags; 674 struct p9_req_t *req; 675 /* Passing zero for tsize/rsize to p9_client_prepare_req() tells it to 676 * auto determine an appropriate (small) request/response size 677 * according to actual message data being sent. Currently RDMA 678 * transport is excluded from this response message size optimization, 679 * as it would not cope with it, due to its pooled response buffers 680 * (using an optimized request size for RDMA as well though). 681 */ 682 const uint tsize = 0; 683 const uint rsize = c->trans_mod->pooled_rbuffers ? c->msize : 0; 684 685 va_start(ap, fmt); 686 req = p9_client_prepare_req(c, type, tsize, rsize, fmt, ap); 687 va_end(ap); 688 if (IS_ERR(req)) 689 return req; 690 691 req->tc.zc = false; 692 req->rc.zc = false; 693 694 if (signal_pending(current)) { 695 sigpending = 1; 696 clear_thread_flag(TIF_SIGPENDING); 697 } else { 698 sigpending = 0; 699 } 700 701 err = c->trans_mod->request(c, req); 702 if (err < 0) { 703 /* write won't happen */ 704 p9_req_put(c, req); 705 if (err != -ERESTARTSYS && err != -EFAULT) 706 c->status = Disconnected; 707 goto recalc_sigpending; 708 } 709 again: 710 /* Wait for the response */ 711 err = wait_event_killable(req->wq, 712 READ_ONCE(req->status) >= REQ_STATUS_RCVD); 713 714 /* Make sure our req is coherent with regard to updates in other 715 * threads - echoes to wmb() in the callback 716 */ 717 smp_rmb(); 718 719 if (err == -ERESTARTSYS && c->status == Connected && 720 type == P9_TFLUSH) { 721 sigpending = 1; 722 clear_thread_flag(TIF_SIGPENDING); 723 goto again; 724 } 725 726 if (READ_ONCE(req->status) == REQ_STATUS_ERROR) { 727 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 728 err = req->t_err; 729 } 730 if (err == -ERESTARTSYS && c->status == Connected) { 731 p9_debug(P9_DEBUG_MUX, "flushing\n"); 732 sigpending = 1; 733 clear_thread_flag(TIF_SIGPENDING); 734 735 if (c->trans_mod->cancel(c, req)) 736 p9_client_flush(c, req); 737 738 /* if we received the response anyway, don't signal error */ 739 if (READ_ONCE(req->status) == REQ_STATUS_RCVD) 740 err = 0; 741 } 742 recalc_sigpending: 743 if (sigpending) { 744 spin_lock_irqsave(¤t->sighand->siglock, flags); 745 recalc_sigpending(); 746 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 747 } 748 if (err < 0) 749 goto reterr; 750 751 err = p9_check_errors(c, req); 752 trace_9p_client_res(c, type, req->rc.tag, err); 753 if (!err) 754 return req; 755 reterr: 756 p9_req_put(c, req); 757 return ERR_PTR(safe_errno(err)); 758 } 759 760 /** 761 * p9_client_zc_rpc - issue a request and wait for a response 762 * @c: client session 763 * @type: type of request 764 * @uidata: destination for zero copy read 765 * @uodata: source for zero copy write 766 * @inlen: read buffer size 767 * @olen: write buffer size 768 * @in_hdrlen: reader header size, This is the size of response protocol data 769 * @fmt: protocol format string (see protocol.c) 770 * 771 * Returns request structure (which client must free using p9_req_put) 772 */ 773 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 774 struct iov_iter *uidata, 775 struct iov_iter *uodata, 776 int inlen, int olen, int in_hdrlen, 777 const char *fmt, ...) 778 { 779 va_list ap; 780 int sigpending, err; 781 unsigned long flags; 782 struct p9_req_t *req; 783 784 va_start(ap, fmt); 785 /* We allocate a inline protocol data of only 4k bytes. 786 * The actual content is passed in zero-copy fashion. 787 */ 788 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, P9_ZC_HDR_SZ, fmt, ap); 789 va_end(ap); 790 if (IS_ERR(req)) 791 return req; 792 793 req->tc.zc = true; 794 req->rc.zc = true; 795 796 if (signal_pending(current)) { 797 sigpending = 1; 798 clear_thread_flag(TIF_SIGPENDING); 799 } else { 800 sigpending = 0; 801 } 802 803 err = c->trans_mod->zc_request(c, req, uidata, uodata, 804 inlen, olen, in_hdrlen); 805 if (err < 0) { 806 if (err == -EIO) 807 c->status = Disconnected; 808 if (err != -ERESTARTSYS) 809 goto recalc_sigpending; 810 } 811 if (READ_ONCE(req->status) == REQ_STATUS_ERROR) { 812 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 813 err = req->t_err; 814 } 815 if (err == -ERESTARTSYS && c->status == Connected) { 816 p9_debug(P9_DEBUG_MUX, "flushing\n"); 817 sigpending = 1; 818 clear_thread_flag(TIF_SIGPENDING); 819 820 if (c->trans_mod->cancel(c, req)) 821 p9_client_flush(c, req); 822 823 /* if we received the response anyway, don't signal error */ 824 if (READ_ONCE(req->status) == REQ_STATUS_RCVD) 825 err = 0; 826 } 827 recalc_sigpending: 828 if (sigpending) { 829 spin_lock_irqsave(¤t->sighand->siglock, flags); 830 recalc_sigpending(); 831 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 832 } 833 if (err < 0) 834 goto reterr; 835 836 err = p9_check_errors(c, req); 837 trace_9p_client_res(c, type, req->rc.tag, err); 838 if (!err) 839 return req; 840 reterr: 841 p9_req_put(c, req); 842 return ERR_PTR(safe_errno(err)); 843 } 844 845 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 846 { 847 int ret; 848 struct p9_fid *fid; 849 850 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 851 fid = kzalloc(sizeof(*fid), GFP_KERNEL); 852 if (!fid) 853 return NULL; 854 855 fid->mode = -1; 856 fid->uid = current_fsuid(); 857 fid->clnt = clnt; 858 refcount_set(&fid->count, 1); 859 860 idr_preload(GFP_KERNEL); 861 spin_lock_irq(&clnt->lock); 862 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, 863 GFP_NOWAIT); 864 spin_unlock_irq(&clnt->lock); 865 idr_preload_end(); 866 if (!ret) { 867 trace_9p_fid_ref(fid, P9_FID_REF_CREATE); 868 return fid; 869 } 870 871 kfree(fid); 872 return NULL; 873 } 874 875 static void p9_fid_destroy(struct p9_fid *fid) 876 { 877 struct p9_client *clnt; 878 unsigned long flags; 879 880 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 881 trace_9p_fid_ref(fid, P9_FID_REF_DESTROY); 882 clnt = fid->clnt; 883 spin_lock_irqsave(&clnt->lock, flags); 884 idr_remove(&clnt->fids, fid->fid); 885 spin_unlock_irqrestore(&clnt->lock, flags); 886 kfree(fid->rdir); 887 kfree(fid); 888 } 889 890 /* We also need to export tracepoint symbols for tracepoint_enabled() */ 891 EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref); 892 893 void do_trace_9p_fid_get(struct p9_fid *fid) 894 { 895 trace_9p_fid_ref(fid, P9_FID_REF_GET); 896 } 897 EXPORT_SYMBOL(do_trace_9p_fid_get); 898 899 void do_trace_9p_fid_put(struct p9_fid *fid) 900 { 901 trace_9p_fid_ref(fid, P9_FID_REF_PUT); 902 } 903 EXPORT_SYMBOL(do_trace_9p_fid_put); 904 905 static int p9_client_version(struct p9_client *c) 906 { 907 int err = 0; 908 struct p9_req_t *req; 909 char *version = NULL; 910 int msize; 911 912 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 913 c->msize, c->proto_version); 914 915 switch (c->proto_version) { 916 case p9_proto_2000L: 917 req = p9_client_rpc(c, P9_TVERSION, "ds", 918 c->msize, "9P2000.L"); 919 break; 920 case p9_proto_2000u: 921 req = p9_client_rpc(c, P9_TVERSION, "ds", 922 c->msize, "9P2000.u"); 923 break; 924 case p9_proto_legacy: 925 req = p9_client_rpc(c, P9_TVERSION, "ds", 926 c->msize, "9P2000"); 927 break; 928 default: 929 return -EINVAL; 930 } 931 932 if (IS_ERR(req)) 933 return PTR_ERR(req); 934 935 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); 936 if (err) { 937 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 938 trace_9p_protocol_dump(c, &req->rc); 939 goto error; 940 } 941 942 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 943 if (!strncmp(version, "9P2000.L", 8)) { 944 c->proto_version = p9_proto_2000L; 945 } else if (!strncmp(version, "9P2000.u", 8)) { 946 c->proto_version = p9_proto_2000u; 947 } else if (!strncmp(version, "9P2000", 6)) { 948 c->proto_version = p9_proto_legacy; 949 } else { 950 p9_debug(P9_DEBUG_ERROR, 951 "server returned an unknown version: %s\n", version); 952 err = -EREMOTEIO; 953 goto error; 954 } 955 956 if (msize < 4096) { 957 p9_debug(P9_DEBUG_ERROR, 958 "server returned a msize < 4096: %d\n", msize); 959 err = -EREMOTEIO; 960 goto error; 961 } 962 if (msize < c->msize) 963 c->msize = msize; 964 965 error: 966 kfree(version); 967 p9_req_put(c, req); 968 969 return err; 970 } 971 972 struct p9_client *p9_client_create(const char *dev_name, char *options) 973 { 974 int err; 975 struct p9_client *clnt; 976 char *client_id; 977 978 err = 0; 979 clnt = kmalloc(sizeof(*clnt), GFP_KERNEL); 980 if (!clnt) 981 return ERR_PTR(-ENOMEM); 982 983 clnt->trans_mod = NULL; 984 clnt->trans = NULL; 985 clnt->fcall_cache = NULL; 986 987 client_id = utsname()->nodename; 988 memcpy(clnt->name, client_id, strlen(client_id) + 1); 989 990 spin_lock_init(&clnt->lock); 991 idr_init(&clnt->fids); 992 idr_init(&clnt->reqs); 993 994 err = parse_opts(options, clnt); 995 if (err < 0) 996 goto free_client; 997 998 if (!clnt->trans_mod) 999 clnt->trans_mod = v9fs_get_default_trans(); 1000 1001 if (!clnt->trans_mod) { 1002 err = -EPROTONOSUPPORT; 1003 p9_debug(P9_DEBUG_ERROR, 1004 "No transport defined or default transport\n"); 1005 goto free_client; 1006 } 1007 1008 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1009 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1010 1011 err = clnt->trans_mod->create(clnt, dev_name, options); 1012 if (err) 1013 goto put_trans; 1014 1015 if (clnt->msize > clnt->trans_mod->maxsize) { 1016 clnt->msize = clnt->trans_mod->maxsize; 1017 pr_info("Limiting 'msize' to %d as this is the maximum " 1018 "supported by transport %s\n", 1019 clnt->msize, clnt->trans_mod->name 1020 ); 1021 } 1022 1023 if (clnt->msize < 4096) { 1024 p9_debug(P9_DEBUG_ERROR, 1025 "Please specify a msize of at least 4k\n"); 1026 err = -EINVAL; 1027 goto close_trans; 1028 } 1029 1030 err = p9_client_version(clnt); 1031 if (err) 1032 goto close_trans; 1033 1034 /* P9_HDRSZ + 4 is the smallest packet header we can have that is 1035 * followed by data accessed from userspace by read 1036 */ 1037 clnt->fcall_cache = 1038 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, 1039 0, 0, P9_HDRSZ + 4, 1040 clnt->msize - (P9_HDRSZ + 4), 1041 NULL); 1042 1043 return clnt; 1044 1045 close_trans: 1046 clnt->trans_mod->close(clnt); 1047 put_trans: 1048 v9fs_put_trans(clnt->trans_mod); 1049 free_client: 1050 kfree(clnt); 1051 return ERR_PTR(err); 1052 } 1053 EXPORT_SYMBOL(p9_client_create); 1054 1055 void p9_client_destroy(struct p9_client *clnt) 1056 { 1057 struct p9_fid *fid; 1058 int id; 1059 1060 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1061 1062 if (clnt->trans_mod) 1063 clnt->trans_mod->close(clnt); 1064 1065 v9fs_put_trans(clnt->trans_mod); 1066 1067 idr_for_each_entry(&clnt->fids, fid, id) { 1068 pr_info("Found fid %d not clunked\n", fid->fid); 1069 p9_fid_destroy(fid); 1070 } 1071 1072 p9_tag_cleanup(clnt); 1073 1074 kmem_cache_destroy(clnt->fcall_cache); 1075 kfree(clnt); 1076 } 1077 EXPORT_SYMBOL(p9_client_destroy); 1078 1079 void p9_client_disconnect(struct p9_client *clnt) 1080 { 1081 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1082 clnt->status = Disconnected; 1083 } 1084 EXPORT_SYMBOL(p9_client_disconnect); 1085 1086 void p9_client_begin_disconnect(struct p9_client *clnt) 1087 { 1088 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1089 clnt->status = BeginDisconnect; 1090 } 1091 EXPORT_SYMBOL(p9_client_begin_disconnect); 1092 1093 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1094 const char *uname, kuid_t n_uname, 1095 const char *aname) 1096 { 1097 int err = 0; 1098 struct p9_req_t *req; 1099 struct p9_fid *fid; 1100 struct p9_qid qid; 1101 1102 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1103 afid ? afid->fid : -1, uname, aname); 1104 fid = p9_fid_create(clnt); 1105 if (!fid) { 1106 err = -ENOMEM; 1107 goto error; 1108 } 1109 fid->uid = n_uname; 1110 1111 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1112 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1113 if (IS_ERR(req)) { 1114 err = PTR_ERR(req); 1115 goto error; 1116 } 1117 1118 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); 1119 if (err) { 1120 trace_9p_protocol_dump(clnt, &req->rc); 1121 p9_req_put(clnt, req); 1122 goto error; 1123 } 1124 1125 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1126 qid.type, qid.path, qid.version); 1127 1128 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1129 1130 p9_req_put(clnt, req); 1131 return fid; 1132 1133 error: 1134 if (fid) 1135 p9_fid_destroy(fid); 1136 return ERR_PTR(err); 1137 } 1138 EXPORT_SYMBOL(p9_client_attach); 1139 1140 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1141 const unsigned char * const *wnames, int clone) 1142 { 1143 int err; 1144 struct p9_client *clnt; 1145 struct p9_fid *fid; 1146 struct p9_qid *wqids; 1147 struct p9_req_t *req; 1148 u16 nwqids, count; 1149 1150 err = 0; 1151 wqids = NULL; 1152 clnt = oldfid->clnt; 1153 if (clone) { 1154 fid = p9_fid_create(clnt); 1155 if (!fid) { 1156 err = -ENOMEM; 1157 goto error; 1158 } 1159 1160 fid->uid = oldfid->uid; 1161 } else { 1162 fid = oldfid; 1163 } 1164 1165 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1166 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1167 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1168 nwname, wnames); 1169 if (IS_ERR(req)) { 1170 err = PTR_ERR(req); 1171 goto error; 1172 } 1173 1174 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1175 if (err) { 1176 trace_9p_protocol_dump(clnt, &req->rc); 1177 p9_req_put(clnt, req); 1178 goto clunk_fid; 1179 } 1180 p9_req_put(clnt, req); 1181 1182 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1183 1184 if (nwqids != nwname) { 1185 err = -ENOENT; 1186 goto clunk_fid; 1187 } 1188 1189 for (count = 0; count < nwqids; count++) 1190 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1191 count, wqids[count].type, 1192 wqids[count].path, 1193 wqids[count].version); 1194 1195 if (nwname) 1196 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1197 else 1198 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); 1199 1200 kfree(wqids); 1201 return fid; 1202 1203 clunk_fid: 1204 kfree(wqids); 1205 p9_fid_put(fid); 1206 fid = NULL; 1207 1208 error: 1209 if (fid && fid != oldfid) 1210 p9_fid_destroy(fid); 1211 1212 return ERR_PTR(err); 1213 } 1214 EXPORT_SYMBOL(p9_client_walk); 1215 1216 int p9_client_open(struct p9_fid *fid, int mode) 1217 { 1218 int err; 1219 struct p9_client *clnt; 1220 struct p9_req_t *req; 1221 struct p9_qid qid; 1222 int iounit; 1223 1224 clnt = fid->clnt; 1225 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1226 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1227 err = 0; 1228 1229 if (fid->mode != -1) 1230 return -EINVAL; 1231 1232 if (p9_is_proto_dotl(clnt)) 1233 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode & P9L_MODE_MASK); 1234 else 1235 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode & P9L_MODE_MASK); 1236 if (IS_ERR(req)) { 1237 err = PTR_ERR(req); 1238 goto error; 1239 } 1240 1241 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1242 if (err) { 1243 trace_9p_protocol_dump(clnt, &req->rc); 1244 goto free_and_error; 1245 } 1246 1247 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1248 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1249 qid.path, qid.version, iounit); 1250 1251 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1252 fid->mode = mode; 1253 fid->iounit = iounit; 1254 1255 free_and_error: 1256 p9_req_put(clnt, req); 1257 error: 1258 return err; 1259 } 1260 EXPORT_SYMBOL(p9_client_open); 1261 1262 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, 1263 u32 mode, kgid_t gid, struct p9_qid *qid) 1264 { 1265 int err = 0; 1266 struct p9_client *clnt; 1267 struct p9_req_t *req; 1268 int iounit; 1269 1270 p9_debug(P9_DEBUG_9P, 1271 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1272 ofid->fid, name, flags, mode, 1273 from_kgid(&init_user_ns, gid)); 1274 clnt = ofid->clnt; 1275 1276 if (ofid->mode != -1) 1277 return -EINVAL; 1278 1279 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1280 mode & P9L_MODE_MASK, gid); 1281 if (IS_ERR(req)) { 1282 err = PTR_ERR(req); 1283 goto error; 1284 } 1285 1286 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); 1287 if (err) { 1288 trace_9p_protocol_dump(clnt, &req->rc); 1289 goto free_and_error; 1290 } 1291 1292 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1293 qid->type, qid->path, qid->version, iounit); 1294 1295 memmove(&ofid->qid, qid, sizeof(struct p9_qid)); 1296 ofid->mode = flags; 1297 ofid->iounit = iounit; 1298 1299 free_and_error: 1300 p9_req_put(clnt, req); 1301 error: 1302 return err; 1303 } 1304 EXPORT_SYMBOL(p9_client_create_dotl); 1305 1306 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1307 char *extension) 1308 { 1309 int err; 1310 struct p9_client *clnt; 1311 struct p9_req_t *req; 1312 struct p9_qid qid; 1313 int iounit; 1314 1315 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1316 fid->fid, name, perm, mode); 1317 err = 0; 1318 clnt = fid->clnt; 1319 1320 if (fid->mode != -1) 1321 return -EINVAL; 1322 1323 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1324 mode & P9L_MODE_MASK, extension); 1325 if (IS_ERR(req)) { 1326 err = PTR_ERR(req); 1327 goto error; 1328 } 1329 1330 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1331 if (err) { 1332 trace_9p_protocol_dump(clnt, &req->rc); 1333 goto free_and_error; 1334 } 1335 1336 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1337 qid.type, qid.path, qid.version, iounit); 1338 1339 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1340 fid->mode = mode; 1341 fid->iounit = iounit; 1342 1343 free_and_error: 1344 p9_req_put(clnt, req); 1345 error: 1346 return err; 1347 } 1348 EXPORT_SYMBOL(p9_client_fcreate); 1349 1350 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1351 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1352 { 1353 int err = 0; 1354 struct p9_client *clnt; 1355 struct p9_req_t *req; 1356 1357 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1358 dfid->fid, name, symtgt); 1359 clnt = dfid->clnt; 1360 1361 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1362 gid); 1363 if (IS_ERR(req)) { 1364 err = PTR_ERR(req); 1365 goto error; 1366 } 1367 1368 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 1369 if (err) { 1370 trace_9p_protocol_dump(clnt, &req->rc); 1371 goto free_and_error; 1372 } 1373 1374 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1375 qid->type, qid->path, qid->version); 1376 1377 free_and_error: 1378 p9_req_put(clnt, req); 1379 error: 1380 return err; 1381 } 1382 EXPORT_SYMBOL(p9_client_symlink); 1383 1384 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1385 { 1386 struct p9_client *clnt; 1387 struct p9_req_t *req; 1388 1389 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1390 dfid->fid, oldfid->fid, newname); 1391 clnt = dfid->clnt; 1392 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1393 newname); 1394 if (IS_ERR(req)) 1395 return PTR_ERR(req); 1396 1397 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1398 p9_req_put(clnt, req); 1399 return 0; 1400 } 1401 EXPORT_SYMBOL(p9_client_link); 1402 1403 int p9_client_fsync(struct p9_fid *fid, int datasync) 1404 { 1405 int err; 1406 struct p9_client *clnt; 1407 struct p9_req_t *req; 1408 1409 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1410 fid->fid, datasync); 1411 err = 0; 1412 clnt = fid->clnt; 1413 1414 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1415 if (IS_ERR(req)) { 1416 err = PTR_ERR(req); 1417 goto error; 1418 } 1419 1420 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1421 1422 p9_req_put(clnt, req); 1423 1424 error: 1425 return err; 1426 } 1427 EXPORT_SYMBOL(p9_client_fsync); 1428 1429 int p9_client_clunk(struct p9_fid *fid) 1430 { 1431 int err; 1432 struct p9_client *clnt; 1433 struct p9_req_t *req; 1434 int retries = 0; 1435 1436 again: 1437 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", 1438 fid->fid, retries); 1439 err = 0; 1440 clnt = fid->clnt; 1441 1442 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1443 if (IS_ERR(req)) { 1444 err = PTR_ERR(req); 1445 goto error; 1446 } 1447 1448 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1449 1450 p9_req_put(clnt, req); 1451 error: 1452 /* Fid is not valid even after a failed clunk 1453 * If interrupted, retry once then give up and 1454 * leak fid until umount. 1455 */ 1456 if (err == -ERESTARTSYS) { 1457 if (retries++ == 0) 1458 goto again; 1459 } else { 1460 p9_fid_destroy(fid); 1461 } 1462 return err; 1463 } 1464 EXPORT_SYMBOL(p9_client_clunk); 1465 1466 int p9_client_remove(struct p9_fid *fid) 1467 { 1468 int err; 1469 struct p9_client *clnt; 1470 struct p9_req_t *req; 1471 1472 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1473 err = 0; 1474 clnt = fid->clnt; 1475 1476 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1477 if (IS_ERR(req)) { 1478 err = PTR_ERR(req); 1479 goto error; 1480 } 1481 1482 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1483 1484 p9_req_put(clnt, req); 1485 error: 1486 if (err == -ERESTARTSYS) 1487 p9_fid_put(fid); 1488 else 1489 p9_fid_destroy(fid); 1490 return err; 1491 } 1492 EXPORT_SYMBOL(p9_client_remove); 1493 1494 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1495 { 1496 int err = 0; 1497 struct p9_req_t *req; 1498 struct p9_client *clnt; 1499 1500 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1501 dfid->fid, name, flags); 1502 1503 clnt = dfid->clnt; 1504 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1505 if (IS_ERR(req)) { 1506 err = PTR_ERR(req); 1507 goto error; 1508 } 1509 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1510 1511 p9_req_put(clnt, req); 1512 error: 1513 return err; 1514 } 1515 EXPORT_SYMBOL(p9_client_unlinkat); 1516 1517 int 1518 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1519 { 1520 int total = 0; 1521 *err = 0; 1522 1523 while (iov_iter_count(to)) { 1524 int count; 1525 1526 count = p9_client_read_once(fid, offset, to, err); 1527 if (!count || *err) 1528 break; 1529 offset += count; 1530 total += count; 1531 } 1532 return total; 1533 } 1534 EXPORT_SYMBOL(p9_client_read); 1535 1536 int 1537 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, 1538 int *err) 1539 { 1540 struct p9_client *clnt = fid->clnt; 1541 struct p9_req_t *req; 1542 int count = iov_iter_count(to); 1543 int rsize, received, non_zc = 0; 1544 char *dataptr; 1545 1546 *err = 0; 1547 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n", 1548 fid->fid, offset, iov_iter_count(to)); 1549 1550 rsize = fid->iounit; 1551 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1552 rsize = clnt->msize - P9_IOHDRSZ; 1553 1554 if (count < rsize) 1555 rsize = count; 1556 1557 /* Don't bother zerocopy for small IO (< 1024) */ 1558 if (clnt->trans_mod->zc_request && rsize > 1024) { 1559 /* response header len is 11 1560 * PDU Header(7) + IO Size (4) 1561 */ 1562 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1563 0, 11, "dqd", fid->fid, 1564 offset, rsize); 1565 } else { 1566 non_zc = 1; 1567 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1568 rsize); 1569 } 1570 if (IS_ERR(req)) { 1571 *err = PTR_ERR(req); 1572 if (!non_zc) 1573 iov_iter_revert(to, count - iov_iter_count(to)); 1574 return 0; 1575 } 1576 1577 *err = p9pdu_readf(&req->rc, clnt->proto_version, 1578 "D", &received, &dataptr); 1579 if (*err) { 1580 if (!non_zc) 1581 iov_iter_revert(to, count - iov_iter_count(to)); 1582 trace_9p_protocol_dump(clnt, &req->rc); 1583 p9_req_put(clnt, req); 1584 return 0; 1585 } 1586 if (rsize < received) { 1587 pr_err("bogus RREAD count (%d > %d)\n", received, rsize); 1588 received = rsize; 1589 } 1590 1591 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1592 1593 if (non_zc) { 1594 int n = copy_to_iter(dataptr, received, to); 1595 1596 if (n != received) { 1597 *err = -EFAULT; 1598 p9_req_put(clnt, req); 1599 return n; 1600 } 1601 } else { 1602 iov_iter_revert(to, count - received - iov_iter_count(to)); 1603 } 1604 p9_req_put(clnt, req); 1605 return received; 1606 } 1607 EXPORT_SYMBOL(p9_client_read_once); 1608 1609 int 1610 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1611 { 1612 struct p9_client *clnt = fid->clnt; 1613 struct p9_req_t *req; 1614 int total = 0; 1615 *err = 0; 1616 1617 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", 1618 fid->fid, offset, iov_iter_count(from)); 1619 1620 while (iov_iter_count(from)) { 1621 int count = iov_iter_count(from); 1622 int rsize = fid->iounit; 1623 int written; 1624 1625 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1626 rsize = clnt->msize - P9_IOHDRSZ; 1627 1628 if (count < rsize) 1629 rsize = count; 1630 1631 /* Don't bother zerocopy for small IO (< 1024) */ 1632 if (clnt->trans_mod->zc_request && rsize > 1024) { 1633 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1634 rsize, P9_ZC_HDR_SZ, "dqd", 1635 fid->fid, offset, rsize); 1636 } else { 1637 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1638 offset, rsize, from); 1639 } 1640 if (IS_ERR(req)) { 1641 iov_iter_revert(from, count - iov_iter_count(from)); 1642 *err = PTR_ERR(req); 1643 break; 1644 } 1645 1646 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written); 1647 if (*err) { 1648 iov_iter_revert(from, count - iov_iter_count(from)); 1649 trace_9p_protocol_dump(clnt, &req->rc); 1650 p9_req_put(clnt, req); 1651 break; 1652 } 1653 if (rsize < written) { 1654 pr_err("bogus RWRITE count (%d > %d)\n", written, rsize); 1655 written = rsize; 1656 } 1657 1658 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1659 1660 p9_req_put(clnt, req); 1661 iov_iter_revert(from, count - written - iov_iter_count(from)); 1662 total += written; 1663 offset += written; 1664 } 1665 return total; 1666 } 1667 EXPORT_SYMBOL(p9_client_write); 1668 1669 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1670 { 1671 int err; 1672 struct p9_client *clnt; 1673 struct p9_wstat *ret; 1674 struct p9_req_t *req; 1675 u16 ignored; 1676 1677 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1678 1679 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1680 if (!ret) 1681 return ERR_PTR(-ENOMEM); 1682 1683 err = 0; 1684 clnt = fid->clnt; 1685 1686 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1687 if (IS_ERR(req)) { 1688 err = PTR_ERR(req); 1689 goto error; 1690 } 1691 1692 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); 1693 if (err) { 1694 trace_9p_protocol_dump(clnt, &req->rc); 1695 p9_req_put(clnt, req); 1696 goto error; 1697 } 1698 1699 p9_debug(P9_DEBUG_9P, 1700 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1701 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1702 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1703 "<<< uid=%d gid=%d n_muid=%d\n", 1704 ret->size, ret->type, ret->dev, ret->qid.type, ret->qid.path, 1705 ret->qid.version, ret->mode, 1706 ret->atime, ret->mtime, ret->length, 1707 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1708 from_kuid(&init_user_ns, ret->n_uid), 1709 from_kgid(&init_user_ns, ret->n_gid), 1710 from_kuid(&init_user_ns, ret->n_muid)); 1711 1712 p9_req_put(clnt, req); 1713 return ret; 1714 1715 error: 1716 kfree(ret); 1717 return ERR_PTR(err); 1718 } 1719 EXPORT_SYMBOL(p9_client_stat); 1720 1721 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1722 u64 request_mask) 1723 { 1724 int err; 1725 struct p9_client *clnt; 1726 struct p9_stat_dotl *ret; 1727 struct p9_req_t *req; 1728 1729 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1730 fid->fid, request_mask); 1731 1732 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1733 if (!ret) 1734 return ERR_PTR(-ENOMEM); 1735 1736 err = 0; 1737 clnt = fid->clnt; 1738 1739 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1740 if (IS_ERR(req)) { 1741 err = PTR_ERR(req); 1742 goto error; 1743 } 1744 1745 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); 1746 if (err) { 1747 trace_9p_protocol_dump(clnt, &req->rc); 1748 p9_req_put(clnt, req); 1749 goto error; 1750 } 1751 1752 p9_debug(P9_DEBUG_9P, "<<< RGETATTR st_result_mask=%lld\n" 1753 "<<< qid=%x.%llx.%x\n" 1754 "<<< st_mode=%8.8x st_nlink=%llu\n" 1755 "<<< st_uid=%d st_gid=%d\n" 1756 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1757 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1758 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1759 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1760 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1761 "<<< st_gen=%lld st_data_version=%lld\n", 1762 ret->st_result_mask, 1763 ret->qid.type, ret->qid.path, ret->qid.version, 1764 ret->st_mode, ret->st_nlink, 1765 from_kuid(&init_user_ns, ret->st_uid), 1766 from_kgid(&init_user_ns, ret->st_gid), 1767 ret->st_rdev, ret->st_size, ret->st_blksize, ret->st_blocks, 1768 ret->st_atime_sec, ret->st_atime_nsec, 1769 ret->st_mtime_sec, ret->st_mtime_nsec, 1770 ret->st_ctime_sec, ret->st_ctime_nsec, 1771 ret->st_btime_sec, ret->st_btime_nsec, 1772 ret->st_gen, ret->st_data_version); 1773 1774 p9_req_put(clnt, req); 1775 return ret; 1776 1777 error: 1778 kfree(ret); 1779 return ERR_PTR(err); 1780 } 1781 EXPORT_SYMBOL(p9_client_getattr_dotl); 1782 1783 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1784 { 1785 int ret; 1786 1787 /* NOTE: size shouldn't include its own length */ 1788 /* size[2] type[2] dev[4] qid[13] */ 1789 /* mode[4] atime[4] mtime[4] length[8]*/ 1790 /* name[s] uid[s] gid[s] muid[s] */ 1791 ret = 2 + 4 + 13 + 4 + 4 + 4 + 8 + 2 + 2 + 2 + 2; 1792 1793 if (wst->name) 1794 ret += strlen(wst->name); 1795 if (wst->uid) 1796 ret += strlen(wst->uid); 1797 if (wst->gid) 1798 ret += strlen(wst->gid); 1799 if (wst->muid) 1800 ret += strlen(wst->muid); 1801 1802 if (proto_version == p9_proto_2000u || 1803 proto_version == p9_proto_2000L) { 1804 /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1805 ret += 2 + 4 + 4 + 4; 1806 if (wst->extension) 1807 ret += strlen(wst->extension); 1808 } 1809 1810 return ret; 1811 } 1812 1813 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1814 { 1815 int err; 1816 struct p9_req_t *req; 1817 struct p9_client *clnt; 1818 1819 err = 0; 1820 clnt = fid->clnt; 1821 wst->size = p9_client_statsize(wst, clnt->proto_version); 1822 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", 1823 fid->fid); 1824 p9_debug(P9_DEBUG_9P, 1825 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1826 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1827 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1828 " uid=%d gid=%d n_muid=%d\n", 1829 wst->size, wst->type, wst->dev, wst->qid.type, 1830 wst->qid.path, wst->qid.version, 1831 wst->mode, wst->atime, wst->mtime, wst->length, 1832 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1833 from_kuid(&init_user_ns, wst->n_uid), 1834 from_kgid(&init_user_ns, wst->n_gid), 1835 from_kuid(&init_user_ns, wst->n_muid)); 1836 1837 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", 1838 fid->fid, wst->size + 2, wst); 1839 if (IS_ERR(req)) { 1840 err = PTR_ERR(req); 1841 goto error; 1842 } 1843 1844 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1845 1846 p9_req_put(clnt, req); 1847 error: 1848 return err; 1849 } 1850 EXPORT_SYMBOL(p9_client_wstat); 1851 1852 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1853 { 1854 int err; 1855 struct p9_req_t *req; 1856 struct p9_client *clnt; 1857 1858 err = 0; 1859 clnt = fid->clnt; 1860 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1861 p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n", 1862 p9attr->valid, p9attr->mode, 1863 from_kuid(&init_user_ns, p9attr->uid), 1864 from_kgid(&init_user_ns, p9attr->gid), 1865 p9attr->size); 1866 p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n", 1867 p9attr->atime_sec, p9attr->atime_nsec); 1868 p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n", 1869 p9attr->mtime_sec, p9attr->mtime_nsec); 1870 1871 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1872 1873 if (IS_ERR(req)) { 1874 err = PTR_ERR(req); 1875 goto error; 1876 } 1877 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1878 p9_req_put(clnt, req); 1879 error: 1880 return err; 1881 } 1882 EXPORT_SYMBOL(p9_client_setattr); 1883 1884 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1885 { 1886 int err; 1887 struct p9_req_t *req; 1888 struct p9_client *clnt; 1889 1890 err = 0; 1891 clnt = fid->clnt; 1892 1893 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1894 1895 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1896 if (IS_ERR(req)) { 1897 err = PTR_ERR(req); 1898 goto error; 1899 } 1900 1901 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1902 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1903 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1904 if (err) { 1905 trace_9p_protocol_dump(clnt, &req->rc); 1906 p9_req_put(clnt, req); 1907 goto error; 1908 } 1909 1910 p9_debug(P9_DEBUG_9P, 1911 "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n", 1912 fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree, 1913 sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen); 1914 1915 p9_req_put(clnt, req); 1916 error: 1917 return err; 1918 } 1919 EXPORT_SYMBOL(p9_client_statfs); 1920 1921 int p9_client_rename(struct p9_fid *fid, 1922 struct p9_fid *newdirfid, const char *name) 1923 { 1924 int err; 1925 struct p9_req_t *req; 1926 struct p9_client *clnt; 1927 1928 err = 0; 1929 clnt = fid->clnt; 1930 1931 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1932 fid->fid, newdirfid->fid, name); 1933 1934 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1935 newdirfid->fid, name); 1936 if (IS_ERR(req)) { 1937 err = PTR_ERR(req); 1938 goto error; 1939 } 1940 1941 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1942 1943 p9_req_put(clnt, req); 1944 error: 1945 return err; 1946 } 1947 EXPORT_SYMBOL(p9_client_rename); 1948 1949 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1950 struct p9_fid *newdirfid, const char *new_name) 1951 { 1952 int err; 1953 struct p9_req_t *req; 1954 struct p9_client *clnt; 1955 1956 err = 0; 1957 clnt = olddirfid->clnt; 1958 1959 p9_debug(P9_DEBUG_9P, 1960 ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n", 1961 olddirfid->fid, old_name, newdirfid->fid, new_name); 1962 1963 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1964 old_name, newdirfid->fid, new_name); 1965 if (IS_ERR(req)) { 1966 err = PTR_ERR(req); 1967 goto error; 1968 } 1969 1970 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1971 newdirfid->fid, new_name); 1972 1973 p9_req_put(clnt, req); 1974 error: 1975 return err; 1976 } 1977 EXPORT_SYMBOL(p9_client_renameat); 1978 1979 /* An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1980 */ 1981 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1982 const char *attr_name, u64 *attr_size) 1983 { 1984 int err; 1985 struct p9_req_t *req; 1986 struct p9_client *clnt; 1987 struct p9_fid *attr_fid; 1988 1989 err = 0; 1990 clnt = file_fid->clnt; 1991 attr_fid = p9_fid_create(clnt); 1992 if (!attr_fid) { 1993 err = -ENOMEM; 1994 goto error; 1995 } 1996 p9_debug(P9_DEBUG_9P, 1997 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 1998 file_fid->fid, attr_fid->fid, attr_name); 1999 2000 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 2001 file_fid->fid, attr_fid->fid, attr_name); 2002 if (IS_ERR(req)) { 2003 err = PTR_ERR(req); 2004 goto error; 2005 } 2006 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); 2007 if (err) { 2008 trace_9p_protocol_dump(clnt, &req->rc); 2009 p9_req_put(clnt, req); 2010 goto clunk_fid; 2011 } 2012 p9_req_put(clnt, req); 2013 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2014 attr_fid->fid, *attr_size); 2015 return attr_fid; 2016 clunk_fid: 2017 p9_fid_put(attr_fid); 2018 attr_fid = NULL; 2019 error: 2020 if (attr_fid && attr_fid != file_fid) 2021 p9_fid_destroy(attr_fid); 2022 2023 return ERR_PTR(err); 2024 } 2025 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2026 2027 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2028 u64 attr_size, int flags) 2029 { 2030 int err; 2031 struct p9_req_t *req; 2032 struct p9_client *clnt; 2033 2034 p9_debug(P9_DEBUG_9P, 2035 ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n", 2036 fid->fid, name, attr_size, flags); 2037 err = 0; 2038 clnt = fid->clnt; 2039 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2040 fid->fid, name, attr_size, flags); 2041 if (IS_ERR(req)) { 2042 err = PTR_ERR(req); 2043 goto error; 2044 } 2045 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2046 p9_req_put(clnt, req); 2047 error: 2048 return err; 2049 } 2050 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2051 2052 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2053 { 2054 int err, rsize, non_zc = 0; 2055 struct p9_client *clnt; 2056 struct p9_req_t *req; 2057 char *dataptr; 2058 struct kvec kv = {.iov_base = data, .iov_len = count}; 2059 struct iov_iter to; 2060 2061 iov_iter_kvec(&to, ITER_DEST, &kv, 1, count); 2062 2063 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2064 fid->fid, offset, count); 2065 2066 err = 0; 2067 clnt = fid->clnt; 2068 2069 rsize = fid->iounit; 2070 if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ) 2071 rsize = clnt->msize - P9_READDIRHDRSZ; 2072 2073 if (count < rsize) 2074 rsize = count; 2075 2076 /* Don't bother zerocopy for small IO (< 1024) */ 2077 if (clnt->trans_mod->zc_request && rsize > 1024) { 2078 /* response header len is 11 2079 * PDU Header(7) + IO Size (4) 2080 */ 2081 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2082 11, "dqd", fid->fid, offset, rsize); 2083 } else { 2084 non_zc = 1; 2085 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2086 offset, rsize); 2087 } 2088 if (IS_ERR(req)) { 2089 err = PTR_ERR(req); 2090 goto error; 2091 } 2092 2093 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); 2094 if (err) { 2095 trace_9p_protocol_dump(clnt, &req->rc); 2096 goto free_and_error; 2097 } 2098 if (rsize < count) { 2099 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2100 count = rsize; 2101 } 2102 2103 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2104 2105 if (non_zc) 2106 memmove(data, dataptr, count); 2107 2108 p9_req_put(clnt, req); 2109 return count; 2110 2111 free_and_error: 2112 p9_req_put(clnt, req); 2113 error: 2114 return err; 2115 } 2116 EXPORT_SYMBOL(p9_client_readdir); 2117 2118 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2119 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2120 { 2121 int err; 2122 struct p9_client *clnt; 2123 struct p9_req_t *req; 2124 2125 err = 0; 2126 clnt = fid->clnt; 2127 p9_debug(P9_DEBUG_9P, 2128 ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n", 2129 fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2130 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2131 MAJOR(rdev), MINOR(rdev), gid); 2132 if (IS_ERR(req)) 2133 return PTR_ERR(req); 2134 2135 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2136 if (err) { 2137 trace_9p_protocol_dump(clnt, &req->rc); 2138 goto error; 2139 } 2140 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", 2141 qid->type, qid->path, qid->version); 2142 2143 error: 2144 p9_req_put(clnt, req); 2145 return err; 2146 } 2147 EXPORT_SYMBOL(p9_client_mknod_dotl); 2148 2149 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2150 kgid_t gid, struct p9_qid *qid) 2151 { 2152 int err; 2153 struct p9_client *clnt; 2154 struct p9_req_t *req; 2155 2156 err = 0; 2157 clnt = fid->clnt; 2158 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2159 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2160 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", 2161 fid->fid, name, mode, gid); 2162 if (IS_ERR(req)) 2163 return PTR_ERR(req); 2164 2165 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2166 if (err) { 2167 trace_9p_protocol_dump(clnt, &req->rc); 2168 goto error; 2169 } 2170 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2171 qid->path, qid->version); 2172 2173 error: 2174 p9_req_put(clnt, req); 2175 return err; 2176 } 2177 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2178 2179 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2180 { 2181 int err; 2182 struct p9_client *clnt; 2183 struct p9_req_t *req; 2184 2185 err = 0; 2186 clnt = fid->clnt; 2187 p9_debug(P9_DEBUG_9P, 2188 ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n", 2189 fid->fid, flock->type, flock->flags, flock->start, 2190 flock->length, flock->proc_id, flock->client_id); 2191 2192 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2193 flock->flags, flock->start, flock->length, 2194 flock->proc_id, flock->client_id); 2195 2196 if (IS_ERR(req)) 2197 return PTR_ERR(req); 2198 2199 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); 2200 if (err) { 2201 trace_9p_protocol_dump(clnt, &req->rc); 2202 goto error; 2203 } 2204 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2205 error: 2206 p9_req_put(clnt, req); 2207 return err; 2208 } 2209 EXPORT_SYMBOL(p9_client_lock_dotl); 2210 2211 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2212 { 2213 int err; 2214 struct p9_client *clnt; 2215 struct p9_req_t *req; 2216 2217 err = 0; 2218 clnt = fid->clnt; 2219 p9_debug(P9_DEBUG_9P, 2220 ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n", 2221 fid->fid, glock->type, glock->start, glock->length, 2222 glock->proc_id, glock->client_id); 2223 2224 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, 2225 glock->type, glock->start, glock->length, 2226 glock->proc_id, glock->client_id); 2227 2228 if (IS_ERR(req)) 2229 return PTR_ERR(req); 2230 2231 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, 2232 &glock->start, &glock->length, &glock->proc_id, 2233 &glock->client_id); 2234 if (err) { 2235 trace_9p_protocol_dump(clnt, &req->rc); 2236 goto error; 2237 } 2238 p9_debug(P9_DEBUG_9P, 2239 "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n", 2240 glock->type, glock->start, glock->length, 2241 glock->proc_id, glock->client_id); 2242 error: 2243 p9_req_put(clnt, req); 2244 return err; 2245 } 2246 EXPORT_SYMBOL(p9_client_getlock_dotl); 2247 2248 int p9_client_readlink(struct p9_fid *fid, char **target) 2249 { 2250 int err; 2251 struct p9_client *clnt; 2252 struct p9_req_t *req; 2253 2254 err = 0; 2255 clnt = fid->clnt; 2256 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2257 2258 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2259 if (IS_ERR(req)) 2260 return PTR_ERR(req); 2261 2262 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); 2263 if (err) { 2264 trace_9p_protocol_dump(clnt, &req->rc); 2265 goto error; 2266 } 2267 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2268 error: 2269 p9_req_put(clnt, req); 2270 return err; 2271 } 2272 EXPORT_SYMBOL(p9_client_readlink); 2273 2274 int __init p9_client_init(void) 2275 { 2276 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); 2277 return p9_req_cache ? 0 : -ENOMEM; 2278 } 2279 2280 void __exit p9_client_exit(void) 2281 { 2282 kmem_cache_destroy(p9_req_cache); 2283 } 2284