1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * 9P Client 4 * 5 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> 6 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net> 7 */ 8 9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 10 11 #include <linux/module.h> 12 #include <linux/errno.h> 13 #include <linux/fs.h> 14 #include <linux/poll.h> 15 #include <linux/idr.h> 16 #include <linux/mutex.h> 17 #include <linux/slab.h> 18 #include <linux/sched/signal.h> 19 #include <linux/uaccess.h> 20 #include <linux/uio.h> 21 #include <net/9p/9p.h> 22 #include <linux/parser.h> 23 #include <linux/seq_file.h> 24 #include <net/9p/client.h> 25 #include <net/9p/transport.h> 26 #include "protocol.h" 27 28 #define CREATE_TRACE_POINTS 29 #include <trace/events/9p.h> 30 31 #define DEFAULT_MSIZE (128 * 1024) 32 33 /* Client Option Parsing (code inspired by NFS code) 34 * - a little lazy - parse all client options 35 */ 36 37 enum { 38 Opt_msize, 39 Opt_trans, 40 Opt_legacy, 41 Opt_version, 42 Opt_err, 43 }; 44 45 static const match_table_t tokens = { 46 {Opt_msize, "msize=%u"}, 47 {Opt_legacy, "noextend"}, 48 {Opt_trans, "trans=%s"}, 49 {Opt_version, "version=%s"}, 50 {Opt_err, NULL}, 51 }; 52 53 inline int p9_is_proto_dotl(struct p9_client *clnt) 54 { 55 return clnt->proto_version == p9_proto_2000L; 56 } 57 EXPORT_SYMBOL(p9_is_proto_dotl); 58 59 inline int p9_is_proto_dotu(struct p9_client *clnt) 60 { 61 return clnt->proto_version == p9_proto_2000u; 62 } 63 EXPORT_SYMBOL(p9_is_proto_dotu); 64 65 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt) 66 { 67 if (clnt->msize != DEFAULT_MSIZE) 68 seq_printf(m, ",msize=%u", clnt->msize); 69 seq_printf(m, ",trans=%s", clnt->trans_mod->name); 70 71 switch (clnt->proto_version) { 72 case p9_proto_legacy: 73 seq_puts(m, ",noextend"); 74 break; 75 case p9_proto_2000u: 76 seq_puts(m, ",version=9p2000.u"); 77 break; 78 case p9_proto_2000L: 79 /* Default */ 80 break; 81 } 82 83 if (clnt->trans_mod->show_options) 84 return clnt->trans_mod->show_options(m, clnt); 85 return 0; 86 } 87 EXPORT_SYMBOL(p9_show_client_options); 88 89 /* Some error codes are taken directly from the server replies, 90 * make sure they are valid. 91 */ 92 static int safe_errno(int err) 93 { 94 if (err > 0 || err < -MAX_ERRNO) { 95 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err); 96 return -EPROTO; 97 } 98 return err; 99 } 100 101 /* Interpret mount option for protocol version */ 102 static int get_protocol_version(char *s) 103 { 104 int version = -EINVAL; 105 106 if (!strcmp(s, "9p2000")) { 107 version = p9_proto_legacy; 108 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n"); 109 } else if (!strcmp(s, "9p2000.u")) { 110 version = p9_proto_2000u; 111 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); 112 } else if (!strcmp(s, "9p2000.L")) { 113 version = p9_proto_2000L; 114 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); 115 } else { 116 pr_info("Unknown protocol version %s\n", s); 117 } 118 119 return version; 120 } 121 122 /** 123 * parse_opts - parse mount options into client structure 124 * @opts: options string passed from mount 125 * @clnt: existing v9fs client information 126 * 127 * Return 0 upon success, -ERRNO upon failure 128 */ 129 130 static int parse_opts(char *opts, struct p9_client *clnt) 131 { 132 char *options, *tmp_options; 133 char *p; 134 substring_t args[MAX_OPT_ARGS]; 135 int option; 136 char *s; 137 int ret = 0; 138 139 clnt->proto_version = p9_proto_2000L; 140 clnt->msize = DEFAULT_MSIZE; 141 142 if (!opts) 143 return 0; 144 145 tmp_options = kstrdup(opts, GFP_KERNEL); 146 if (!tmp_options) 147 return -ENOMEM; 148 options = tmp_options; 149 150 while ((p = strsep(&options, ",")) != NULL) { 151 int token, r; 152 153 if (!*p) 154 continue; 155 token = match_token(p, tokens, args); 156 switch (token) { 157 case Opt_msize: 158 r = match_int(&args[0], &option); 159 if (r < 0) { 160 p9_debug(P9_DEBUG_ERROR, 161 "integer field, but no integer?\n"); 162 ret = r; 163 continue; 164 } 165 if (option < 4096) { 166 p9_debug(P9_DEBUG_ERROR, 167 "msize should be at least 4k\n"); 168 ret = -EINVAL; 169 continue; 170 } 171 clnt->msize = option; 172 break; 173 case Opt_trans: 174 s = match_strdup(&args[0]); 175 if (!s) { 176 ret = -ENOMEM; 177 p9_debug(P9_DEBUG_ERROR, 178 "problem allocating copy of trans arg\n"); 179 goto free_and_return; 180 } 181 182 v9fs_put_trans(clnt->trans_mod); 183 clnt->trans_mod = v9fs_get_trans_by_name(s); 184 if (!clnt->trans_mod) { 185 pr_info("Could not find request transport: %s\n", 186 s); 187 ret = -EINVAL; 188 } 189 kfree(s); 190 break; 191 case Opt_legacy: 192 clnt->proto_version = p9_proto_legacy; 193 break; 194 case Opt_version: 195 s = match_strdup(&args[0]); 196 if (!s) { 197 ret = -ENOMEM; 198 p9_debug(P9_DEBUG_ERROR, 199 "problem allocating copy of version arg\n"); 200 goto free_and_return; 201 } 202 r = get_protocol_version(s); 203 if (r < 0) 204 ret = r; 205 else 206 clnt->proto_version = r; 207 kfree(s); 208 break; 209 default: 210 continue; 211 } 212 } 213 214 free_and_return: 215 if (ret) 216 v9fs_put_trans(clnt->trans_mod); 217 kfree(tmp_options); 218 return ret; 219 } 220 221 static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc, 222 int alloc_msize) 223 { 224 if (likely(c->fcall_cache) && alloc_msize == c->msize) { 225 fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS); 226 fc->cache = c->fcall_cache; 227 } else { 228 fc->sdata = kmalloc(alloc_msize, GFP_NOFS); 229 fc->cache = NULL; 230 } 231 if (!fc->sdata) 232 return -ENOMEM; 233 fc->capacity = alloc_msize; 234 return 0; 235 } 236 237 void p9_fcall_fini(struct p9_fcall *fc) 238 { 239 /* sdata can be NULL for interrupted requests in trans_rdma, 240 * and kmem_cache_free does not do NULL-check for us 241 */ 242 if (unlikely(!fc->sdata)) 243 return; 244 245 if (fc->cache) 246 kmem_cache_free(fc->cache, fc->sdata); 247 else 248 kfree(fc->sdata); 249 } 250 EXPORT_SYMBOL(p9_fcall_fini); 251 252 static struct kmem_cache *p9_req_cache; 253 254 /** 255 * p9_tag_alloc - Allocate a new request. 256 * @c: Client session. 257 * @type: Transaction type. 258 * @t_size: Buffer size for holding this request 259 * (automatic calculation by format template if 0). 260 * @r_size: Buffer size for holding server's reply on this request 261 * (automatic calculation by format template if 0). 262 * @fmt: Format template for assembling 9p request message 263 * (see p9pdu_vwritef). 264 * @ap: Variable arguments to be fed to passed format template 265 * (see p9pdu_vwritef). 266 * 267 * Context: Process context. 268 * Return: Pointer to new request. 269 */ 270 static struct p9_req_t * 271 p9_tag_alloc(struct p9_client *c, int8_t type, uint t_size, uint r_size, 272 const char *fmt, va_list ap) 273 { 274 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); 275 int alloc_tsize; 276 int alloc_rsize; 277 int tag; 278 va_list apc; 279 280 va_copy(apc, ap); 281 alloc_tsize = min_t(size_t, c->msize, 282 t_size ?: p9_msg_buf_size(c, type, fmt, apc)); 283 va_end(apc); 284 285 alloc_rsize = min_t(size_t, c->msize, 286 r_size ?: p9_msg_buf_size(c, type + 1, fmt, ap)); 287 288 if (!req) 289 return ERR_PTR(-ENOMEM); 290 291 if (p9_fcall_init(c, &req->tc, alloc_tsize)) 292 goto free_req; 293 if (p9_fcall_init(c, &req->rc, alloc_rsize)) 294 goto free; 295 296 p9pdu_reset(&req->tc); 297 p9pdu_reset(&req->rc); 298 req->t_err = 0; 299 req->status = REQ_STATUS_ALLOC; 300 /* refcount needs to be set to 0 before inserting into the idr 301 * so p9_tag_lookup does not accept a request that is not fully 302 * initialized. refcount_set to 2 below will mark request ready. 303 */ 304 refcount_set(&req->refcount, 0); 305 init_waitqueue_head(&req->wq); 306 INIT_LIST_HEAD(&req->req_list); 307 308 idr_preload(GFP_NOFS); 309 spin_lock_irq(&c->lock); 310 if (type == P9_TVERSION) 311 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1, 312 GFP_NOWAIT); 313 else 314 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT); 315 req->tc.tag = tag; 316 spin_unlock_irq(&c->lock); 317 idr_preload_end(); 318 if (tag < 0) 319 goto free; 320 321 /* Init ref to two because in the general case there is one ref 322 * that is put asynchronously by a writer thread, one ref 323 * temporarily given by p9_tag_lookup and put by p9_client_cb 324 * in the recv thread, and one ref put by p9_req_put in the 325 * main thread. The only exception is virtio that does not use 326 * p9_tag_lookup but does not have a writer thread either 327 * (the write happens synchronously in the request/zc_request 328 * callback), so p9_client_cb eats the second ref there 329 * as the pointer is duplicated directly by virtqueue_add_sgs() 330 */ 331 refcount_set(&req->refcount, 2); 332 333 return req; 334 335 free: 336 p9_fcall_fini(&req->tc); 337 p9_fcall_fini(&req->rc); 338 free_req: 339 kmem_cache_free(p9_req_cache, req); 340 return ERR_PTR(-ENOMEM); 341 } 342 343 /** 344 * p9_tag_lookup - Look up a request by tag. 345 * @c: Client session. 346 * @tag: Transaction ID. 347 * 348 * Context: Any context. 349 * Return: A request, or %NULL if there is no request with that tag. 350 */ 351 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 352 { 353 struct p9_req_t *req; 354 355 rcu_read_lock(); 356 again: 357 req = idr_find(&c->reqs, tag); 358 if (req) { 359 /* We have to be careful with the req found under rcu_read_lock 360 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the 361 * ref again without corrupting other data, then check again 362 * that the tag matches once we have the ref 363 */ 364 if (!p9_req_try_get(req)) 365 goto again; 366 if (req->tc.tag != tag) { 367 p9_req_put(c, req); 368 goto again; 369 } 370 } 371 rcu_read_unlock(); 372 373 return req; 374 } 375 EXPORT_SYMBOL(p9_tag_lookup); 376 377 /** 378 * p9_tag_remove - Remove a tag. 379 * @c: Client session. 380 * @r: Request of reference. 381 * 382 * Context: Any context. 383 */ 384 static void p9_tag_remove(struct p9_client *c, struct p9_req_t *r) 385 { 386 unsigned long flags; 387 u16 tag = r->tc.tag; 388 389 p9_debug(P9_DEBUG_MUX, "freeing clnt %p req %p tag: %d\n", c, r, tag); 390 spin_lock_irqsave(&c->lock, flags); 391 idr_remove(&c->reqs, tag); 392 spin_unlock_irqrestore(&c->lock, flags); 393 } 394 395 int p9_req_put(struct p9_client *c, struct p9_req_t *r) 396 { 397 if (refcount_dec_and_test(&r->refcount)) { 398 p9_tag_remove(c, r); 399 400 p9_fcall_fini(&r->tc); 401 p9_fcall_fini(&r->rc); 402 kmem_cache_free(p9_req_cache, r); 403 return 1; 404 } 405 return 0; 406 } 407 EXPORT_SYMBOL(p9_req_put); 408 409 /** 410 * p9_tag_cleanup - cleans up tags structure and reclaims resources 411 * @c: v9fs client struct 412 * 413 * This frees resources associated with the tags structure 414 * 415 */ 416 static void p9_tag_cleanup(struct p9_client *c) 417 { 418 struct p9_req_t *req; 419 int id; 420 421 rcu_read_lock(); 422 idr_for_each_entry(&c->reqs, req, id) { 423 pr_info("Tag %d still in use\n", id); 424 if (p9_req_put(c, req) == 0) 425 pr_warn("Packet with tag %d has still references", 426 req->tc.tag); 427 } 428 rcu_read_unlock(); 429 } 430 431 /** 432 * p9_client_cb - call back from transport to client 433 * @c: client state 434 * @req: request received 435 * @status: request status, one of REQ_STATUS_* 436 * 437 */ 438 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) 439 { 440 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); 441 442 /* This barrier is needed to make sure any change made to req before 443 * the status change is visible to another thread 444 */ 445 smp_wmb(); 446 req->status = status; 447 448 wake_up(&req->wq); 449 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); 450 p9_req_put(c, req); 451 } 452 EXPORT_SYMBOL(p9_client_cb); 453 454 /** 455 * p9_parse_header - parse header arguments out of a packet 456 * @pdu: packet to parse 457 * @size: size of packet 458 * @type: type of request 459 * @tag: tag of packet 460 * @rewind: set if we need to rewind offset afterwards 461 */ 462 463 int 464 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, 465 int16_t *tag, int rewind) 466 { 467 s8 r_type; 468 s16 r_tag; 469 s32 r_size; 470 int offset = pdu->offset; 471 int err; 472 473 pdu->offset = 0; 474 475 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 476 if (err) 477 goto rewind_and_exit; 478 479 if (type) 480 *type = r_type; 481 if (tag) 482 *tag = r_tag; 483 if (size) 484 *size = r_size; 485 486 if (pdu->size != r_size || r_size < 7) { 487 err = -EINVAL; 488 goto rewind_and_exit; 489 } 490 491 pdu->id = r_type; 492 pdu->tag = r_tag; 493 494 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 495 pdu->size, pdu->id, pdu->tag); 496 497 rewind_and_exit: 498 if (rewind) 499 pdu->offset = offset; 500 return err; 501 } 502 EXPORT_SYMBOL(p9_parse_header); 503 504 /** 505 * p9_check_errors - check 9p packet for error return and process it 506 * @c: current client instance 507 * @req: request to parse and check for error conditions 508 * 509 * returns error code if one is discovered, otherwise returns 0 510 * 511 * this will have to be more complicated if we have multiple 512 * error packet types 513 */ 514 515 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 516 { 517 s8 type; 518 int err; 519 int ecode; 520 521 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 522 if (req->rc.size > 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 (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, req->status >= REQ_STATUS_RCVD); 708 709 /* Make sure our req is coherent with regard to updates in other 710 * threads - echoes to wmb() in the callback 711 */ 712 smp_rmb(); 713 714 if (err == -ERESTARTSYS && c->status == Connected && 715 type == P9_TFLUSH) { 716 sigpending = 1; 717 clear_thread_flag(TIF_SIGPENDING); 718 goto again; 719 } 720 721 if (req->status == REQ_STATUS_ERROR) { 722 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 723 err = req->t_err; 724 } 725 if (err == -ERESTARTSYS && c->status == Connected) { 726 p9_debug(P9_DEBUG_MUX, "flushing\n"); 727 sigpending = 1; 728 clear_thread_flag(TIF_SIGPENDING); 729 730 if (c->trans_mod->cancel(c, req)) 731 p9_client_flush(c, req); 732 733 /* if we received the response anyway, don't signal error */ 734 if (req->status == REQ_STATUS_RCVD) 735 err = 0; 736 } 737 recalc_sigpending: 738 if (sigpending) { 739 spin_lock_irqsave(¤t->sighand->siglock, flags); 740 recalc_sigpending(); 741 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 742 } 743 if (err < 0) 744 goto reterr; 745 746 err = p9_check_errors(c, req); 747 trace_9p_client_res(c, type, req->rc.tag, err); 748 if (!err) 749 return req; 750 reterr: 751 p9_req_put(c, req); 752 return ERR_PTR(safe_errno(err)); 753 } 754 755 /** 756 * p9_client_zc_rpc - issue a request and wait for a response 757 * @c: client session 758 * @type: type of request 759 * @uidata: destination for zero copy read 760 * @uodata: source for zero copy write 761 * @inlen: read buffer size 762 * @olen: write buffer size 763 * @in_hdrlen: reader header size, This is the size of response protocol data 764 * @fmt: protocol format string (see protocol.c) 765 * 766 * Returns request structure (which client must free using p9_req_put) 767 */ 768 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 769 struct iov_iter *uidata, 770 struct iov_iter *uodata, 771 int inlen, int olen, int in_hdrlen, 772 const char *fmt, ...) 773 { 774 va_list ap; 775 int sigpending, err; 776 unsigned long flags; 777 struct p9_req_t *req; 778 779 va_start(ap, fmt); 780 /* We allocate a inline protocol data of only 4k bytes. 781 * The actual content is passed in zero-copy fashion. 782 */ 783 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, P9_ZC_HDR_SZ, fmt, ap); 784 va_end(ap); 785 if (IS_ERR(req)) 786 return req; 787 788 req->tc.zc = true; 789 req->rc.zc = true; 790 791 if (signal_pending(current)) { 792 sigpending = 1; 793 clear_thread_flag(TIF_SIGPENDING); 794 } else { 795 sigpending = 0; 796 } 797 798 err = c->trans_mod->zc_request(c, req, uidata, uodata, 799 inlen, olen, in_hdrlen); 800 if (err < 0) { 801 if (err == -EIO) 802 c->status = Disconnected; 803 if (err != -ERESTARTSYS) 804 goto recalc_sigpending; 805 } 806 if (req->status == REQ_STATUS_ERROR) { 807 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 808 err = req->t_err; 809 } 810 if (err == -ERESTARTSYS && c->status == Connected) { 811 p9_debug(P9_DEBUG_MUX, "flushing\n"); 812 sigpending = 1; 813 clear_thread_flag(TIF_SIGPENDING); 814 815 if (c->trans_mod->cancel(c, req)) 816 p9_client_flush(c, req); 817 818 /* if we received the response anyway, don't signal error */ 819 if (req->status == REQ_STATUS_RCVD) 820 err = 0; 821 } 822 recalc_sigpending: 823 if (sigpending) { 824 spin_lock_irqsave(¤t->sighand->siglock, flags); 825 recalc_sigpending(); 826 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 827 } 828 if (err < 0) 829 goto reterr; 830 831 err = p9_check_errors(c, req); 832 trace_9p_client_res(c, type, req->rc.tag, err); 833 if (!err) 834 return req; 835 reterr: 836 p9_req_put(c, req); 837 return ERR_PTR(safe_errno(err)); 838 } 839 840 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 841 { 842 int ret; 843 struct p9_fid *fid; 844 845 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 846 fid = kzalloc(sizeof(*fid), GFP_KERNEL); 847 if (!fid) 848 return NULL; 849 850 fid->mode = -1; 851 fid->uid = current_fsuid(); 852 fid->clnt = clnt; 853 refcount_set(&fid->count, 1); 854 855 idr_preload(GFP_KERNEL); 856 spin_lock_irq(&clnt->lock); 857 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, 858 GFP_NOWAIT); 859 spin_unlock_irq(&clnt->lock); 860 idr_preload_end(); 861 if (!ret) { 862 trace_9p_fid_ref(fid, P9_FID_REF_CREATE); 863 return fid; 864 } 865 866 kfree(fid); 867 return NULL; 868 } 869 870 static void p9_fid_destroy(struct p9_fid *fid) 871 { 872 struct p9_client *clnt; 873 unsigned long flags; 874 875 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 876 trace_9p_fid_ref(fid, P9_FID_REF_DESTROY); 877 clnt = fid->clnt; 878 spin_lock_irqsave(&clnt->lock, flags); 879 idr_remove(&clnt->fids, fid->fid); 880 spin_unlock_irqrestore(&clnt->lock, flags); 881 kfree(fid->rdir); 882 kfree(fid); 883 } 884 885 /* We also need to export tracepoint symbols for tracepoint_enabled() */ 886 EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref); 887 888 void do_trace_9p_fid_get(struct p9_fid *fid) 889 { 890 trace_9p_fid_ref(fid, P9_FID_REF_GET); 891 } 892 EXPORT_SYMBOL(do_trace_9p_fid_get); 893 894 void do_trace_9p_fid_put(struct p9_fid *fid) 895 { 896 trace_9p_fid_ref(fid, P9_FID_REF_PUT); 897 } 898 EXPORT_SYMBOL(do_trace_9p_fid_put); 899 900 static int p9_client_version(struct p9_client *c) 901 { 902 int err = 0; 903 struct p9_req_t *req; 904 char *version = NULL; 905 int msize; 906 907 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 908 c->msize, c->proto_version); 909 910 switch (c->proto_version) { 911 case p9_proto_2000L: 912 req = p9_client_rpc(c, P9_TVERSION, "ds", 913 c->msize, "9P2000.L"); 914 break; 915 case p9_proto_2000u: 916 req = p9_client_rpc(c, P9_TVERSION, "ds", 917 c->msize, "9P2000.u"); 918 break; 919 case p9_proto_legacy: 920 req = p9_client_rpc(c, P9_TVERSION, "ds", 921 c->msize, "9P2000"); 922 break; 923 default: 924 return -EINVAL; 925 } 926 927 if (IS_ERR(req)) 928 return PTR_ERR(req); 929 930 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); 931 if (err) { 932 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 933 trace_9p_protocol_dump(c, &req->rc); 934 goto error; 935 } 936 937 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 938 if (!strncmp(version, "9P2000.L", 8)) { 939 c->proto_version = p9_proto_2000L; 940 } else if (!strncmp(version, "9P2000.u", 8)) { 941 c->proto_version = p9_proto_2000u; 942 } else if (!strncmp(version, "9P2000", 6)) { 943 c->proto_version = p9_proto_legacy; 944 } else { 945 p9_debug(P9_DEBUG_ERROR, 946 "server returned an unknown version: %s\n", version); 947 err = -EREMOTEIO; 948 goto error; 949 } 950 951 if (msize < 4096) { 952 p9_debug(P9_DEBUG_ERROR, 953 "server returned a msize < 4096: %d\n", msize); 954 err = -EREMOTEIO; 955 goto error; 956 } 957 if (msize < c->msize) 958 c->msize = msize; 959 960 error: 961 kfree(version); 962 p9_req_put(c, req); 963 964 return err; 965 } 966 967 struct p9_client *p9_client_create(const char *dev_name, char *options) 968 { 969 int err; 970 struct p9_client *clnt; 971 char *client_id; 972 973 err = 0; 974 clnt = kmalloc(sizeof(*clnt), GFP_KERNEL); 975 if (!clnt) 976 return ERR_PTR(-ENOMEM); 977 978 clnt->trans_mod = NULL; 979 clnt->trans = NULL; 980 clnt->fcall_cache = NULL; 981 982 client_id = utsname()->nodename; 983 memcpy(clnt->name, client_id, strlen(client_id) + 1); 984 985 spin_lock_init(&clnt->lock); 986 idr_init(&clnt->fids); 987 idr_init(&clnt->reqs); 988 989 err = parse_opts(options, clnt); 990 if (err < 0) 991 goto free_client; 992 993 if (!clnt->trans_mod) 994 clnt->trans_mod = v9fs_get_default_trans(); 995 996 if (!clnt->trans_mod) { 997 err = -EPROTONOSUPPORT; 998 p9_debug(P9_DEBUG_ERROR, 999 "No transport defined or default transport\n"); 1000 goto free_client; 1001 } 1002 1003 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1004 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1005 1006 err = clnt->trans_mod->create(clnt, dev_name, options); 1007 if (err) 1008 goto put_trans; 1009 1010 if (clnt->msize > clnt->trans_mod->maxsize) { 1011 clnt->msize = clnt->trans_mod->maxsize; 1012 pr_info("Limiting 'msize' to %d as this is the maximum " 1013 "supported by transport %s\n", 1014 clnt->msize, clnt->trans_mod->name 1015 ); 1016 } 1017 1018 if (clnt->msize < 4096) { 1019 p9_debug(P9_DEBUG_ERROR, 1020 "Please specify a msize of at least 4k\n"); 1021 err = -EINVAL; 1022 goto close_trans; 1023 } 1024 1025 err = p9_client_version(clnt); 1026 if (err) 1027 goto close_trans; 1028 1029 /* P9_HDRSZ + 4 is the smallest packet header we can have that is 1030 * followed by data accessed from userspace by read 1031 */ 1032 clnt->fcall_cache = 1033 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, 1034 0, 0, P9_HDRSZ + 4, 1035 clnt->msize - (P9_HDRSZ + 4), 1036 NULL); 1037 1038 return clnt; 1039 1040 close_trans: 1041 clnt->trans_mod->close(clnt); 1042 put_trans: 1043 v9fs_put_trans(clnt->trans_mod); 1044 free_client: 1045 kfree(clnt); 1046 return ERR_PTR(err); 1047 } 1048 EXPORT_SYMBOL(p9_client_create); 1049 1050 void p9_client_destroy(struct p9_client *clnt) 1051 { 1052 struct p9_fid *fid; 1053 int id; 1054 1055 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1056 1057 if (clnt->trans_mod) 1058 clnt->trans_mod->close(clnt); 1059 1060 v9fs_put_trans(clnt->trans_mod); 1061 1062 idr_for_each_entry(&clnt->fids, fid, id) { 1063 pr_info("Found fid %d not clunked\n", fid->fid); 1064 p9_fid_destroy(fid); 1065 } 1066 1067 p9_tag_cleanup(clnt); 1068 1069 kmem_cache_destroy(clnt->fcall_cache); 1070 kfree(clnt); 1071 } 1072 EXPORT_SYMBOL(p9_client_destroy); 1073 1074 void p9_client_disconnect(struct p9_client *clnt) 1075 { 1076 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1077 clnt->status = Disconnected; 1078 } 1079 EXPORT_SYMBOL(p9_client_disconnect); 1080 1081 void p9_client_begin_disconnect(struct p9_client *clnt) 1082 { 1083 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1084 clnt->status = BeginDisconnect; 1085 } 1086 EXPORT_SYMBOL(p9_client_begin_disconnect); 1087 1088 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1089 const char *uname, kuid_t n_uname, 1090 const char *aname) 1091 { 1092 int err = 0; 1093 struct p9_req_t *req; 1094 struct p9_fid *fid; 1095 struct p9_qid qid; 1096 1097 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1098 afid ? afid->fid : -1, uname, aname); 1099 fid = p9_fid_create(clnt); 1100 if (!fid) { 1101 err = -ENOMEM; 1102 goto error; 1103 } 1104 fid->uid = n_uname; 1105 1106 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1107 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1108 if (IS_ERR(req)) { 1109 err = PTR_ERR(req); 1110 goto error; 1111 } 1112 1113 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); 1114 if (err) { 1115 trace_9p_protocol_dump(clnt, &req->rc); 1116 p9_req_put(clnt, req); 1117 goto error; 1118 } 1119 1120 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1121 qid.type, qid.path, qid.version); 1122 1123 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1124 1125 p9_req_put(clnt, req); 1126 return fid; 1127 1128 error: 1129 if (fid) 1130 p9_fid_destroy(fid); 1131 return ERR_PTR(err); 1132 } 1133 EXPORT_SYMBOL(p9_client_attach); 1134 1135 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1136 const unsigned char * const *wnames, int clone) 1137 { 1138 int err; 1139 struct p9_client *clnt; 1140 struct p9_fid *fid; 1141 struct p9_qid *wqids; 1142 struct p9_req_t *req; 1143 u16 nwqids, count; 1144 1145 err = 0; 1146 wqids = NULL; 1147 clnt = oldfid->clnt; 1148 if (clone) { 1149 fid = p9_fid_create(clnt); 1150 if (!fid) { 1151 err = -ENOMEM; 1152 goto error; 1153 } 1154 1155 fid->uid = oldfid->uid; 1156 } else { 1157 fid = oldfid; 1158 } 1159 1160 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1161 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1162 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1163 nwname, wnames); 1164 if (IS_ERR(req)) { 1165 err = PTR_ERR(req); 1166 goto error; 1167 } 1168 1169 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1170 if (err) { 1171 trace_9p_protocol_dump(clnt, &req->rc); 1172 p9_req_put(clnt, req); 1173 goto clunk_fid; 1174 } 1175 p9_req_put(clnt, req); 1176 1177 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1178 1179 if (nwqids != nwname) { 1180 err = -ENOENT; 1181 goto clunk_fid; 1182 } 1183 1184 for (count = 0; count < nwqids; count++) 1185 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1186 count, wqids[count].type, 1187 wqids[count].path, 1188 wqids[count].version); 1189 1190 if (nwname) 1191 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1192 else 1193 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); 1194 1195 kfree(wqids); 1196 return fid; 1197 1198 clunk_fid: 1199 kfree(wqids); 1200 p9_fid_put(fid); 1201 fid = NULL; 1202 1203 error: 1204 if (fid && fid != oldfid) 1205 p9_fid_destroy(fid); 1206 1207 return ERR_PTR(err); 1208 } 1209 EXPORT_SYMBOL(p9_client_walk); 1210 1211 int p9_client_open(struct p9_fid *fid, int mode) 1212 { 1213 int err; 1214 struct p9_client *clnt; 1215 struct p9_req_t *req; 1216 struct p9_qid qid; 1217 int iounit; 1218 1219 clnt = fid->clnt; 1220 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1221 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1222 err = 0; 1223 1224 if (fid->mode != -1) 1225 return -EINVAL; 1226 1227 if (p9_is_proto_dotl(clnt)) 1228 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1229 else 1230 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1231 if (IS_ERR(req)) { 1232 err = PTR_ERR(req); 1233 goto error; 1234 } 1235 1236 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1237 if (err) { 1238 trace_9p_protocol_dump(clnt, &req->rc); 1239 goto free_and_error; 1240 } 1241 1242 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1243 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1244 qid.path, qid.version, iounit); 1245 1246 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1247 fid->mode = mode; 1248 fid->iounit = iounit; 1249 1250 free_and_error: 1251 p9_req_put(clnt, req); 1252 error: 1253 return err; 1254 } 1255 EXPORT_SYMBOL(p9_client_open); 1256 1257 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, 1258 u32 mode, kgid_t gid, struct p9_qid *qid) 1259 { 1260 int err = 0; 1261 struct p9_client *clnt; 1262 struct p9_req_t *req; 1263 int iounit; 1264 1265 p9_debug(P9_DEBUG_9P, 1266 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1267 ofid->fid, name, flags, mode, 1268 from_kgid(&init_user_ns, gid)); 1269 clnt = ofid->clnt; 1270 1271 if (ofid->mode != -1) 1272 return -EINVAL; 1273 1274 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1275 mode, gid); 1276 if (IS_ERR(req)) { 1277 err = PTR_ERR(req); 1278 goto error; 1279 } 1280 1281 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); 1282 if (err) { 1283 trace_9p_protocol_dump(clnt, &req->rc); 1284 goto free_and_error; 1285 } 1286 1287 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1288 qid->type, qid->path, qid->version, iounit); 1289 1290 memmove(&ofid->qid, qid, sizeof(struct p9_qid)); 1291 ofid->mode = mode; 1292 ofid->iounit = iounit; 1293 1294 free_and_error: 1295 p9_req_put(clnt, req); 1296 error: 1297 return err; 1298 } 1299 EXPORT_SYMBOL(p9_client_create_dotl); 1300 1301 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1302 char *extension) 1303 { 1304 int err; 1305 struct p9_client *clnt; 1306 struct p9_req_t *req; 1307 struct p9_qid qid; 1308 int iounit; 1309 1310 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1311 fid->fid, name, perm, mode); 1312 err = 0; 1313 clnt = fid->clnt; 1314 1315 if (fid->mode != -1) 1316 return -EINVAL; 1317 1318 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1319 mode, extension); 1320 if (IS_ERR(req)) { 1321 err = PTR_ERR(req); 1322 goto error; 1323 } 1324 1325 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1326 if (err) { 1327 trace_9p_protocol_dump(clnt, &req->rc); 1328 goto free_and_error; 1329 } 1330 1331 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1332 qid.type, qid.path, qid.version, iounit); 1333 1334 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1335 fid->mode = mode; 1336 fid->iounit = iounit; 1337 1338 free_and_error: 1339 p9_req_put(clnt, req); 1340 error: 1341 return err; 1342 } 1343 EXPORT_SYMBOL(p9_client_fcreate); 1344 1345 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1346 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1347 { 1348 int err = 0; 1349 struct p9_client *clnt; 1350 struct p9_req_t *req; 1351 1352 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1353 dfid->fid, name, symtgt); 1354 clnt = dfid->clnt; 1355 1356 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1357 gid); 1358 if (IS_ERR(req)) { 1359 err = PTR_ERR(req); 1360 goto error; 1361 } 1362 1363 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 1364 if (err) { 1365 trace_9p_protocol_dump(clnt, &req->rc); 1366 goto free_and_error; 1367 } 1368 1369 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1370 qid->type, qid->path, qid->version); 1371 1372 free_and_error: 1373 p9_req_put(clnt, req); 1374 error: 1375 return err; 1376 } 1377 EXPORT_SYMBOL(p9_client_symlink); 1378 1379 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1380 { 1381 struct p9_client *clnt; 1382 struct p9_req_t *req; 1383 1384 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1385 dfid->fid, oldfid->fid, newname); 1386 clnt = dfid->clnt; 1387 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1388 newname); 1389 if (IS_ERR(req)) 1390 return PTR_ERR(req); 1391 1392 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1393 p9_req_put(clnt, req); 1394 return 0; 1395 } 1396 EXPORT_SYMBOL(p9_client_link); 1397 1398 int p9_client_fsync(struct p9_fid *fid, int datasync) 1399 { 1400 int err; 1401 struct p9_client *clnt; 1402 struct p9_req_t *req; 1403 1404 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1405 fid->fid, datasync); 1406 err = 0; 1407 clnt = fid->clnt; 1408 1409 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1410 if (IS_ERR(req)) { 1411 err = PTR_ERR(req); 1412 goto error; 1413 } 1414 1415 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1416 1417 p9_req_put(clnt, req); 1418 1419 error: 1420 return err; 1421 } 1422 EXPORT_SYMBOL(p9_client_fsync); 1423 1424 int p9_client_clunk(struct p9_fid *fid) 1425 { 1426 int err; 1427 struct p9_client *clnt; 1428 struct p9_req_t *req; 1429 int retries = 0; 1430 1431 again: 1432 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", 1433 fid->fid, retries); 1434 err = 0; 1435 clnt = fid->clnt; 1436 1437 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1438 if (IS_ERR(req)) { 1439 err = PTR_ERR(req); 1440 goto error; 1441 } 1442 1443 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1444 1445 p9_req_put(clnt, req); 1446 error: 1447 /* Fid is not valid even after a failed clunk 1448 * If interrupted, retry once then give up and 1449 * leak fid until umount. 1450 */ 1451 if (err == -ERESTARTSYS) { 1452 if (retries++ == 0) 1453 goto again; 1454 } else { 1455 p9_fid_destroy(fid); 1456 } 1457 return err; 1458 } 1459 EXPORT_SYMBOL(p9_client_clunk); 1460 1461 int p9_client_remove(struct p9_fid *fid) 1462 { 1463 int err; 1464 struct p9_client *clnt; 1465 struct p9_req_t *req; 1466 1467 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1468 err = 0; 1469 clnt = fid->clnt; 1470 1471 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1472 if (IS_ERR(req)) { 1473 err = PTR_ERR(req); 1474 goto error; 1475 } 1476 1477 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1478 1479 p9_req_put(clnt, req); 1480 error: 1481 if (err == -ERESTARTSYS) 1482 p9_fid_put(fid); 1483 else 1484 p9_fid_destroy(fid); 1485 return err; 1486 } 1487 EXPORT_SYMBOL(p9_client_remove); 1488 1489 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1490 { 1491 int err = 0; 1492 struct p9_req_t *req; 1493 struct p9_client *clnt; 1494 1495 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1496 dfid->fid, name, flags); 1497 1498 clnt = dfid->clnt; 1499 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1500 if (IS_ERR(req)) { 1501 err = PTR_ERR(req); 1502 goto error; 1503 } 1504 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1505 1506 p9_req_put(clnt, req); 1507 error: 1508 return err; 1509 } 1510 EXPORT_SYMBOL(p9_client_unlinkat); 1511 1512 int 1513 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1514 { 1515 int total = 0; 1516 *err = 0; 1517 1518 while (iov_iter_count(to)) { 1519 int count; 1520 1521 count = p9_client_read_once(fid, offset, to, err); 1522 if (!count || *err) 1523 break; 1524 offset += count; 1525 total += count; 1526 } 1527 return total; 1528 } 1529 EXPORT_SYMBOL(p9_client_read); 1530 1531 int 1532 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, 1533 int *err) 1534 { 1535 struct p9_client *clnt = fid->clnt; 1536 struct p9_req_t *req; 1537 int count = iov_iter_count(to); 1538 int rsize, received, non_zc = 0; 1539 char *dataptr; 1540 1541 *err = 0; 1542 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n", 1543 fid->fid, offset, iov_iter_count(to)); 1544 1545 rsize = fid->iounit; 1546 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1547 rsize = clnt->msize - P9_IOHDRSZ; 1548 1549 if (count < rsize) 1550 rsize = count; 1551 1552 /* Don't bother zerocopy for small IO (< 1024) */ 1553 if (clnt->trans_mod->zc_request && rsize > 1024) { 1554 /* response header len is 11 1555 * PDU Header(7) + IO Size (4) 1556 */ 1557 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1558 0, 11, "dqd", fid->fid, 1559 offset, rsize); 1560 } else { 1561 non_zc = 1; 1562 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1563 rsize); 1564 } 1565 if (IS_ERR(req)) { 1566 *err = PTR_ERR(req); 1567 if (!non_zc) 1568 iov_iter_revert(to, count - iov_iter_count(to)); 1569 return 0; 1570 } 1571 1572 *err = p9pdu_readf(&req->rc, clnt->proto_version, 1573 "D", &received, &dataptr); 1574 if (*err) { 1575 if (!non_zc) 1576 iov_iter_revert(to, count - iov_iter_count(to)); 1577 trace_9p_protocol_dump(clnt, &req->rc); 1578 p9_req_put(clnt, req); 1579 return 0; 1580 } 1581 if (rsize < received) { 1582 pr_err("bogus RREAD count (%d > %d)\n", received, rsize); 1583 received = rsize; 1584 } 1585 1586 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1587 1588 if (non_zc) { 1589 int n = copy_to_iter(dataptr, received, to); 1590 1591 if (n != received) { 1592 *err = -EFAULT; 1593 p9_req_put(clnt, req); 1594 return n; 1595 } 1596 } else { 1597 iov_iter_revert(to, count - received - iov_iter_count(to)); 1598 } 1599 p9_req_put(clnt, req); 1600 return received; 1601 } 1602 EXPORT_SYMBOL(p9_client_read_once); 1603 1604 int 1605 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1606 { 1607 struct p9_client *clnt = fid->clnt; 1608 struct p9_req_t *req; 1609 int total = 0; 1610 *err = 0; 1611 1612 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", 1613 fid->fid, offset, iov_iter_count(from)); 1614 1615 while (iov_iter_count(from)) { 1616 int count = iov_iter_count(from); 1617 int rsize = fid->iounit; 1618 int written; 1619 1620 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1621 rsize = clnt->msize - P9_IOHDRSZ; 1622 1623 if (count < rsize) 1624 rsize = count; 1625 1626 /* Don't bother zerocopy for small IO (< 1024) */ 1627 if (clnt->trans_mod->zc_request && rsize > 1024) { 1628 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1629 rsize, P9_ZC_HDR_SZ, "dqd", 1630 fid->fid, offset, rsize); 1631 } else { 1632 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1633 offset, rsize, from); 1634 } 1635 if (IS_ERR(req)) { 1636 iov_iter_revert(from, count - iov_iter_count(from)); 1637 *err = PTR_ERR(req); 1638 break; 1639 } 1640 1641 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written); 1642 if (*err) { 1643 iov_iter_revert(from, count - iov_iter_count(from)); 1644 trace_9p_protocol_dump(clnt, &req->rc); 1645 p9_req_put(clnt, req); 1646 break; 1647 } 1648 if (rsize < written) { 1649 pr_err("bogus RWRITE count (%d > %d)\n", written, rsize); 1650 written = rsize; 1651 } 1652 1653 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1654 1655 p9_req_put(clnt, req); 1656 iov_iter_revert(from, count - written - iov_iter_count(from)); 1657 total += written; 1658 offset += written; 1659 } 1660 return total; 1661 } 1662 EXPORT_SYMBOL(p9_client_write); 1663 1664 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1665 { 1666 int err; 1667 struct p9_client *clnt; 1668 struct p9_wstat *ret; 1669 struct p9_req_t *req; 1670 u16 ignored; 1671 1672 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1673 1674 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1675 if (!ret) 1676 return ERR_PTR(-ENOMEM); 1677 1678 err = 0; 1679 clnt = fid->clnt; 1680 1681 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1682 if (IS_ERR(req)) { 1683 err = PTR_ERR(req); 1684 goto error; 1685 } 1686 1687 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); 1688 if (err) { 1689 trace_9p_protocol_dump(clnt, &req->rc); 1690 p9_req_put(clnt, req); 1691 goto error; 1692 } 1693 1694 p9_debug(P9_DEBUG_9P, 1695 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1696 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1697 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1698 "<<< uid=%d gid=%d n_muid=%d\n", 1699 ret->size, ret->type, ret->dev, ret->qid.type, ret->qid.path, 1700 ret->qid.version, ret->mode, 1701 ret->atime, ret->mtime, ret->length, 1702 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1703 from_kuid(&init_user_ns, ret->n_uid), 1704 from_kgid(&init_user_ns, ret->n_gid), 1705 from_kuid(&init_user_ns, ret->n_muid)); 1706 1707 p9_req_put(clnt, req); 1708 return ret; 1709 1710 error: 1711 kfree(ret); 1712 return ERR_PTR(err); 1713 } 1714 EXPORT_SYMBOL(p9_client_stat); 1715 1716 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1717 u64 request_mask) 1718 { 1719 int err; 1720 struct p9_client *clnt; 1721 struct p9_stat_dotl *ret; 1722 struct p9_req_t *req; 1723 1724 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1725 fid->fid, request_mask); 1726 1727 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1728 if (!ret) 1729 return ERR_PTR(-ENOMEM); 1730 1731 err = 0; 1732 clnt = fid->clnt; 1733 1734 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1735 if (IS_ERR(req)) { 1736 err = PTR_ERR(req); 1737 goto error; 1738 } 1739 1740 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); 1741 if (err) { 1742 trace_9p_protocol_dump(clnt, &req->rc); 1743 p9_req_put(clnt, req); 1744 goto error; 1745 } 1746 1747 p9_debug(P9_DEBUG_9P, "<<< RGETATTR st_result_mask=%lld\n" 1748 "<<< qid=%x.%llx.%x\n" 1749 "<<< st_mode=%8.8x st_nlink=%llu\n" 1750 "<<< st_uid=%d st_gid=%d\n" 1751 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1752 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1753 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1754 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1755 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1756 "<<< st_gen=%lld st_data_version=%lld\n", 1757 ret->st_result_mask, 1758 ret->qid.type, ret->qid.path, ret->qid.version, 1759 ret->st_mode, ret->st_nlink, 1760 from_kuid(&init_user_ns, ret->st_uid), 1761 from_kgid(&init_user_ns, ret->st_gid), 1762 ret->st_rdev, ret->st_size, ret->st_blksize, ret->st_blocks, 1763 ret->st_atime_sec, ret->st_atime_nsec, 1764 ret->st_mtime_sec, ret->st_mtime_nsec, 1765 ret->st_ctime_sec, ret->st_ctime_nsec, 1766 ret->st_btime_sec, ret->st_btime_nsec, 1767 ret->st_gen, ret->st_data_version); 1768 1769 p9_req_put(clnt, req); 1770 return ret; 1771 1772 error: 1773 kfree(ret); 1774 return ERR_PTR(err); 1775 } 1776 EXPORT_SYMBOL(p9_client_getattr_dotl); 1777 1778 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1779 { 1780 int ret; 1781 1782 /* NOTE: size shouldn't include its own length */ 1783 /* size[2] type[2] dev[4] qid[13] */ 1784 /* mode[4] atime[4] mtime[4] length[8]*/ 1785 /* name[s] uid[s] gid[s] muid[s] */ 1786 ret = 2 + 4 + 13 + 4 + 4 + 4 + 8 + 2 + 2 + 2 + 2; 1787 1788 if (wst->name) 1789 ret += strlen(wst->name); 1790 if (wst->uid) 1791 ret += strlen(wst->uid); 1792 if (wst->gid) 1793 ret += strlen(wst->gid); 1794 if (wst->muid) 1795 ret += strlen(wst->muid); 1796 1797 if (proto_version == p9_proto_2000u || 1798 proto_version == p9_proto_2000L) { 1799 /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1800 ret += 2 + 4 + 4 + 4; 1801 if (wst->extension) 1802 ret += strlen(wst->extension); 1803 } 1804 1805 return ret; 1806 } 1807 1808 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1809 { 1810 int err; 1811 struct p9_req_t *req; 1812 struct p9_client *clnt; 1813 1814 err = 0; 1815 clnt = fid->clnt; 1816 wst->size = p9_client_statsize(wst, clnt->proto_version); 1817 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", 1818 fid->fid); 1819 p9_debug(P9_DEBUG_9P, 1820 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1821 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1822 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1823 " uid=%d gid=%d n_muid=%d\n", 1824 wst->size, wst->type, wst->dev, wst->qid.type, 1825 wst->qid.path, wst->qid.version, 1826 wst->mode, wst->atime, wst->mtime, wst->length, 1827 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1828 from_kuid(&init_user_ns, wst->n_uid), 1829 from_kgid(&init_user_ns, wst->n_gid), 1830 from_kuid(&init_user_ns, wst->n_muid)); 1831 1832 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", 1833 fid->fid, wst->size + 2, wst); 1834 if (IS_ERR(req)) { 1835 err = PTR_ERR(req); 1836 goto error; 1837 } 1838 1839 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1840 1841 p9_req_put(clnt, req); 1842 error: 1843 return err; 1844 } 1845 EXPORT_SYMBOL(p9_client_wstat); 1846 1847 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1848 { 1849 int err; 1850 struct p9_req_t *req; 1851 struct p9_client *clnt; 1852 1853 err = 0; 1854 clnt = fid->clnt; 1855 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1856 p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n", 1857 p9attr->valid, p9attr->mode, 1858 from_kuid(&init_user_ns, p9attr->uid), 1859 from_kgid(&init_user_ns, p9attr->gid), 1860 p9attr->size); 1861 p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n", 1862 p9attr->atime_sec, p9attr->atime_nsec); 1863 p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n", 1864 p9attr->mtime_sec, p9attr->mtime_nsec); 1865 1866 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1867 1868 if (IS_ERR(req)) { 1869 err = PTR_ERR(req); 1870 goto error; 1871 } 1872 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1873 p9_req_put(clnt, req); 1874 error: 1875 return err; 1876 } 1877 EXPORT_SYMBOL(p9_client_setattr); 1878 1879 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1880 { 1881 int err; 1882 struct p9_req_t *req; 1883 struct p9_client *clnt; 1884 1885 err = 0; 1886 clnt = fid->clnt; 1887 1888 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1889 1890 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1891 if (IS_ERR(req)) { 1892 err = PTR_ERR(req); 1893 goto error; 1894 } 1895 1896 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1897 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1898 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1899 if (err) { 1900 trace_9p_protocol_dump(clnt, &req->rc); 1901 p9_req_put(clnt, req); 1902 goto error; 1903 } 1904 1905 p9_debug(P9_DEBUG_9P, 1906 "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n", 1907 fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree, 1908 sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen); 1909 1910 p9_req_put(clnt, req); 1911 error: 1912 return err; 1913 } 1914 EXPORT_SYMBOL(p9_client_statfs); 1915 1916 int p9_client_rename(struct p9_fid *fid, 1917 struct p9_fid *newdirfid, const char *name) 1918 { 1919 int err; 1920 struct p9_req_t *req; 1921 struct p9_client *clnt; 1922 1923 err = 0; 1924 clnt = fid->clnt; 1925 1926 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1927 fid->fid, newdirfid->fid, name); 1928 1929 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1930 newdirfid->fid, name); 1931 if (IS_ERR(req)) { 1932 err = PTR_ERR(req); 1933 goto error; 1934 } 1935 1936 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1937 1938 p9_req_put(clnt, req); 1939 error: 1940 return err; 1941 } 1942 EXPORT_SYMBOL(p9_client_rename); 1943 1944 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1945 struct p9_fid *newdirfid, const char *new_name) 1946 { 1947 int err; 1948 struct p9_req_t *req; 1949 struct p9_client *clnt; 1950 1951 err = 0; 1952 clnt = olddirfid->clnt; 1953 1954 p9_debug(P9_DEBUG_9P, 1955 ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n", 1956 olddirfid->fid, old_name, newdirfid->fid, new_name); 1957 1958 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1959 old_name, newdirfid->fid, new_name); 1960 if (IS_ERR(req)) { 1961 err = PTR_ERR(req); 1962 goto error; 1963 } 1964 1965 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1966 newdirfid->fid, new_name); 1967 1968 p9_req_put(clnt, req); 1969 error: 1970 return err; 1971 } 1972 EXPORT_SYMBOL(p9_client_renameat); 1973 1974 /* An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1975 */ 1976 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1977 const char *attr_name, u64 *attr_size) 1978 { 1979 int err; 1980 struct p9_req_t *req; 1981 struct p9_client *clnt; 1982 struct p9_fid *attr_fid; 1983 1984 err = 0; 1985 clnt = file_fid->clnt; 1986 attr_fid = p9_fid_create(clnt); 1987 if (!attr_fid) { 1988 err = -ENOMEM; 1989 goto error; 1990 } 1991 p9_debug(P9_DEBUG_9P, 1992 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 1993 file_fid->fid, attr_fid->fid, attr_name); 1994 1995 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 1996 file_fid->fid, attr_fid->fid, attr_name); 1997 if (IS_ERR(req)) { 1998 err = PTR_ERR(req); 1999 goto error; 2000 } 2001 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); 2002 if (err) { 2003 trace_9p_protocol_dump(clnt, &req->rc); 2004 p9_req_put(clnt, req); 2005 goto clunk_fid; 2006 } 2007 p9_req_put(clnt, req); 2008 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2009 attr_fid->fid, *attr_size); 2010 return attr_fid; 2011 clunk_fid: 2012 p9_fid_put(attr_fid); 2013 attr_fid = NULL; 2014 error: 2015 if (attr_fid && attr_fid != file_fid) 2016 p9_fid_destroy(attr_fid); 2017 2018 return ERR_PTR(err); 2019 } 2020 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2021 2022 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2023 u64 attr_size, int flags) 2024 { 2025 int err; 2026 struct p9_req_t *req; 2027 struct p9_client *clnt; 2028 2029 p9_debug(P9_DEBUG_9P, 2030 ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n", 2031 fid->fid, name, attr_size, flags); 2032 err = 0; 2033 clnt = fid->clnt; 2034 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2035 fid->fid, name, attr_size, flags); 2036 if (IS_ERR(req)) { 2037 err = PTR_ERR(req); 2038 goto error; 2039 } 2040 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2041 p9_req_put(clnt, req); 2042 error: 2043 return err; 2044 } 2045 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2046 2047 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2048 { 2049 int err, rsize, non_zc = 0; 2050 struct p9_client *clnt; 2051 struct p9_req_t *req; 2052 char *dataptr; 2053 struct kvec kv = {.iov_base = data, .iov_len = count}; 2054 struct iov_iter to; 2055 2056 iov_iter_kvec(&to, READ, &kv, 1, count); 2057 2058 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2059 fid->fid, offset, count); 2060 2061 err = 0; 2062 clnt = fid->clnt; 2063 2064 rsize = fid->iounit; 2065 if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ) 2066 rsize = clnt->msize - P9_READDIRHDRSZ; 2067 2068 if (count < rsize) 2069 rsize = count; 2070 2071 /* Don't bother zerocopy for small IO (< 1024) */ 2072 if (clnt->trans_mod->zc_request && rsize > 1024) { 2073 /* response header len is 11 2074 * PDU Header(7) + IO Size (4) 2075 */ 2076 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2077 11, "dqd", fid->fid, offset, rsize); 2078 } else { 2079 non_zc = 1; 2080 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2081 offset, rsize); 2082 } 2083 if (IS_ERR(req)) { 2084 err = PTR_ERR(req); 2085 goto error; 2086 } 2087 2088 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); 2089 if (err) { 2090 trace_9p_protocol_dump(clnt, &req->rc); 2091 goto free_and_error; 2092 } 2093 if (rsize < count) { 2094 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2095 count = rsize; 2096 } 2097 2098 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2099 2100 if (non_zc) 2101 memmove(data, dataptr, count); 2102 2103 p9_req_put(clnt, req); 2104 return count; 2105 2106 free_and_error: 2107 p9_req_put(clnt, req); 2108 error: 2109 return err; 2110 } 2111 EXPORT_SYMBOL(p9_client_readdir); 2112 2113 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2114 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2115 { 2116 int err; 2117 struct p9_client *clnt; 2118 struct p9_req_t *req; 2119 2120 err = 0; 2121 clnt = fid->clnt; 2122 p9_debug(P9_DEBUG_9P, 2123 ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n", 2124 fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2125 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2126 MAJOR(rdev), MINOR(rdev), gid); 2127 if (IS_ERR(req)) 2128 return PTR_ERR(req); 2129 2130 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2131 if (err) { 2132 trace_9p_protocol_dump(clnt, &req->rc); 2133 goto error; 2134 } 2135 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", 2136 qid->type, qid->path, qid->version); 2137 2138 error: 2139 p9_req_put(clnt, req); 2140 return err; 2141 } 2142 EXPORT_SYMBOL(p9_client_mknod_dotl); 2143 2144 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2145 kgid_t gid, struct p9_qid *qid) 2146 { 2147 int err; 2148 struct p9_client *clnt; 2149 struct p9_req_t *req; 2150 2151 err = 0; 2152 clnt = fid->clnt; 2153 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2154 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2155 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", 2156 fid->fid, name, mode, gid); 2157 if (IS_ERR(req)) 2158 return PTR_ERR(req); 2159 2160 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2161 if (err) { 2162 trace_9p_protocol_dump(clnt, &req->rc); 2163 goto error; 2164 } 2165 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2166 qid->path, qid->version); 2167 2168 error: 2169 p9_req_put(clnt, req); 2170 return err; 2171 } 2172 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2173 2174 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2175 { 2176 int err; 2177 struct p9_client *clnt; 2178 struct p9_req_t *req; 2179 2180 err = 0; 2181 clnt = fid->clnt; 2182 p9_debug(P9_DEBUG_9P, 2183 ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n", 2184 fid->fid, flock->type, flock->flags, flock->start, 2185 flock->length, flock->proc_id, flock->client_id); 2186 2187 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2188 flock->flags, flock->start, flock->length, 2189 flock->proc_id, flock->client_id); 2190 2191 if (IS_ERR(req)) 2192 return PTR_ERR(req); 2193 2194 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); 2195 if (err) { 2196 trace_9p_protocol_dump(clnt, &req->rc); 2197 goto error; 2198 } 2199 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2200 error: 2201 p9_req_put(clnt, req); 2202 return err; 2203 } 2204 EXPORT_SYMBOL(p9_client_lock_dotl); 2205 2206 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2207 { 2208 int err; 2209 struct p9_client *clnt; 2210 struct p9_req_t *req; 2211 2212 err = 0; 2213 clnt = fid->clnt; 2214 p9_debug(P9_DEBUG_9P, 2215 ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n", 2216 fid->fid, glock->type, glock->start, glock->length, 2217 glock->proc_id, glock->client_id); 2218 2219 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, 2220 glock->type, glock->start, glock->length, 2221 glock->proc_id, glock->client_id); 2222 2223 if (IS_ERR(req)) 2224 return PTR_ERR(req); 2225 2226 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, 2227 &glock->start, &glock->length, &glock->proc_id, 2228 &glock->client_id); 2229 if (err) { 2230 trace_9p_protocol_dump(clnt, &req->rc); 2231 goto error; 2232 } 2233 p9_debug(P9_DEBUG_9P, 2234 "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n", 2235 glock->type, glock->start, glock->length, 2236 glock->proc_id, glock->client_id); 2237 error: 2238 p9_req_put(clnt, req); 2239 return err; 2240 } 2241 EXPORT_SYMBOL(p9_client_getlock_dotl); 2242 2243 int p9_client_readlink(struct p9_fid *fid, char **target) 2244 { 2245 int err; 2246 struct p9_client *clnt; 2247 struct p9_req_t *req; 2248 2249 err = 0; 2250 clnt = fid->clnt; 2251 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2252 2253 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2254 if (IS_ERR(req)) 2255 return PTR_ERR(req); 2256 2257 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); 2258 if (err) { 2259 trace_9p_protocol_dump(clnt, &req->rc); 2260 goto error; 2261 } 2262 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2263 error: 2264 p9_req_put(clnt, req); 2265 return err; 2266 } 2267 EXPORT_SYMBOL(p9_client_readlink); 2268 2269 int __init p9_client_init(void) 2270 { 2271 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); 2272 return p9_req_cache ? 0 : -ENOMEM; 2273 } 2274 2275 void __exit p9_client_exit(void) 2276 { 2277 kmem_cache_destroy(p9_req_cache); 2278 } 2279