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