1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * 9P Client 4 * 5 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> 6 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net> 7 */ 8 9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 10 11 #include <linux/module.h> 12 #include <linux/errno.h> 13 #include <linux/fs.h> 14 #include <linux/poll.h> 15 #include <linux/idr.h> 16 #include <linux/mutex.h> 17 #include <linux/slab.h> 18 #include <linux/sched/signal.h> 19 #include <linux/uaccess.h> 20 #include <linux/uio.h> 21 #include <net/9p/9p.h> 22 #include <linux/parser.h> 23 #include <linux/seq_file.h> 24 #include <net/9p/client.h> 25 #include <net/9p/transport.h> 26 #include "protocol.h" 27 28 #define CREATE_TRACE_POINTS 29 #include <trace/events/9p.h> 30 31 /* DEFAULT MSIZE = 32 pages worth of payload + P9_HDRSZ + 32 * room for write (16 extra) or read (11 extra) operands. 33 */ 34 35 #define DEFAULT_MSIZE ((128 * 1024) + P9_IOHDRSZ) 36 37 /* Client Option Parsing (code inspired by NFS code) 38 * - a little lazy - parse all client options 39 */ 40 41 enum { 42 Opt_msize, 43 Opt_trans, 44 Opt_legacy, 45 Opt_version, 46 Opt_err, 47 }; 48 49 static const match_table_t tokens = { 50 {Opt_msize, "msize=%u"}, 51 {Opt_legacy, "noextend"}, 52 {Opt_trans, "trans=%s"}, 53 {Opt_version, "version=%s"}, 54 {Opt_err, NULL}, 55 }; 56 57 inline int p9_is_proto_dotl(struct p9_client *clnt) 58 { 59 return clnt->proto_version == p9_proto_2000L; 60 } 61 EXPORT_SYMBOL(p9_is_proto_dotl); 62 63 inline int p9_is_proto_dotu(struct p9_client *clnt) 64 { 65 return clnt->proto_version == p9_proto_2000u; 66 } 67 EXPORT_SYMBOL(p9_is_proto_dotu); 68 69 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt) 70 { 71 if (clnt->msize != DEFAULT_MSIZE) 72 seq_printf(m, ",msize=%u", clnt->msize); 73 seq_printf(m, ",trans=%s", clnt->trans_mod->name); 74 75 switch (clnt->proto_version) { 76 case p9_proto_legacy: 77 seq_puts(m, ",noextend"); 78 break; 79 case p9_proto_2000u: 80 seq_puts(m, ",version=9p2000.u"); 81 break; 82 case p9_proto_2000L: 83 /* Default */ 84 break; 85 } 86 87 if (clnt->trans_mod->show_options) 88 return clnt->trans_mod->show_options(m, clnt); 89 return 0; 90 } 91 EXPORT_SYMBOL(p9_show_client_options); 92 93 /* Some error codes are taken directly from the server replies, 94 * make sure they are valid. 95 */ 96 static int safe_errno(int err) 97 { 98 if (err > 0 || err < -MAX_ERRNO) { 99 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err); 100 return -EPROTO; 101 } 102 return err; 103 } 104 105 /* Interpret mount option for protocol version */ 106 static int get_protocol_version(char *s) 107 { 108 int version = -EINVAL; 109 110 if (!strcmp(s, "9p2000")) { 111 version = p9_proto_legacy; 112 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n"); 113 } else if (!strcmp(s, "9p2000.u")) { 114 version = p9_proto_2000u; 115 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); 116 } else if (!strcmp(s, "9p2000.L")) { 117 version = p9_proto_2000L; 118 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); 119 } else { 120 pr_info("Unknown protocol version %s\n", s); 121 } 122 123 return version; 124 } 125 126 /** 127 * parse_opts - parse mount options into client structure 128 * @opts: options string passed from mount 129 * @clnt: existing v9fs client information 130 * 131 * Return 0 upon success, -ERRNO upon failure 132 */ 133 134 static int parse_opts(char *opts, struct p9_client *clnt) 135 { 136 char *options, *tmp_options; 137 char *p; 138 substring_t args[MAX_OPT_ARGS]; 139 int option; 140 char *s; 141 int ret = 0; 142 143 clnt->proto_version = p9_proto_2000L; 144 clnt->msize = DEFAULT_MSIZE; 145 146 if (!opts) 147 return 0; 148 149 tmp_options = kstrdup(opts, GFP_KERNEL); 150 if (!tmp_options) 151 return -ENOMEM; 152 options = tmp_options; 153 154 while ((p = strsep(&options, ",")) != NULL) { 155 int token, r; 156 157 if (!*p) 158 continue; 159 token = match_token(p, tokens, args); 160 switch (token) { 161 case Opt_msize: 162 r = match_int(&args[0], &option); 163 if (r < 0) { 164 p9_debug(P9_DEBUG_ERROR, 165 "integer field, but no integer?\n"); 166 ret = r; 167 continue; 168 } 169 if (option < 4096) { 170 p9_debug(P9_DEBUG_ERROR, 171 "msize should be at least 4k\n"); 172 ret = -EINVAL; 173 continue; 174 } 175 clnt->msize = option; 176 break; 177 case Opt_trans: 178 s = match_strdup(&args[0]); 179 if (!s) { 180 ret = -ENOMEM; 181 p9_debug(P9_DEBUG_ERROR, 182 "problem allocating copy of trans arg\n"); 183 goto free_and_return; 184 } 185 186 v9fs_put_trans(clnt->trans_mod); 187 clnt->trans_mod = v9fs_get_trans_by_name(s); 188 if (!clnt->trans_mod) { 189 pr_info("Could not find request transport: %s\n", 190 s); 191 ret = -EINVAL; 192 } 193 kfree(s); 194 break; 195 case Opt_legacy: 196 clnt->proto_version = p9_proto_legacy; 197 break; 198 case Opt_version: 199 s = match_strdup(&args[0]); 200 if (!s) { 201 ret = -ENOMEM; 202 p9_debug(P9_DEBUG_ERROR, 203 "problem allocating copy of version arg\n"); 204 goto free_and_return; 205 } 206 r = get_protocol_version(s); 207 if (r < 0) 208 ret = r; 209 else 210 clnt->proto_version = r; 211 kfree(s); 212 break; 213 default: 214 continue; 215 } 216 } 217 218 free_and_return: 219 if (ret) 220 v9fs_put_trans(clnt->trans_mod); 221 kfree(tmp_options); 222 return ret; 223 } 224 225 static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc, 226 int alloc_msize) 227 { 228 if (likely(c->fcall_cache) && alloc_msize == c->msize) { 229 fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS); 230 fc->cache = c->fcall_cache; 231 } else { 232 fc->sdata = kmalloc(alloc_msize, GFP_NOFS); 233 fc->cache = NULL; 234 } 235 if (!fc->sdata) 236 return -ENOMEM; 237 fc->capacity = alloc_msize; 238 fc->id = 0; 239 fc->tag = P9_NOTAG; 240 return 0; 241 } 242 243 void p9_fcall_fini(struct p9_fcall *fc) 244 { 245 /* sdata can be NULL for interrupted requests in trans_rdma, 246 * and kmem_cache_free does not do NULL-check for us 247 */ 248 if (unlikely(!fc->sdata)) 249 return; 250 251 if (fc->cache) 252 kmem_cache_free(fc->cache, fc->sdata); 253 else 254 kfree(fc->sdata); 255 } 256 EXPORT_SYMBOL(p9_fcall_fini); 257 258 static struct kmem_cache *p9_req_cache; 259 260 /** 261 * p9_tag_alloc - Allocate a new request. 262 * @c: Client session. 263 * @type: Transaction type. 264 * @t_size: Buffer size for holding this request 265 * (automatic calculation by format template if 0). 266 * @r_size: Buffer size for holding server's reply on this request 267 * (automatic calculation by format template if 0). 268 * @fmt: Format template for assembling 9p request message 269 * (see p9pdu_vwritef). 270 * @ap: Variable arguments to be fed to passed format template 271 * (see p9pdu_vwritef). 272 * 273 * Context: Process context. 274 * Return: Pointer to new request. 275 */ 276 static struct p9_req_t * 277 p9_tag_alloc(struct p9_client *c, int8_t type, uint t_size, uint r_size, 278 const char *fmt, va_list ap) 279 { 280 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); 281 int alloc_tsize; 282 int alloc_rsize; 283 int tag; 284 va_list apc; 285 286 va_copy(apc, ap); 287 alloc_tsize = min_t(size_t, c->msize, 288 t_size ?: p9_msg_buf_size(c, type, fmt, apc)); 289 va_end(apc); 290 291 alloc_rsize = min_t(size_t, c->msize, 292 r_size ?: p9_msg_buf_size(c, type + 1, fmt, ap)); 293 294 if (!req) 295 return ERR_PTR(-ENOMEM); 296 297 if (p9_fcall_init(c, &req->tc, alloc_tsize)) 298 goto free_req; 299 if (p9_fcall_init(c, &req->rc, alloc_rsize)) 300 goto free; 301 302 p9pdu_reset(&req->tc); 303 p9pdu_reset(&req->rc); 304 req->t_err = 0; 305 req->status = REQ_STATUS_ALLOC; 306 /* refcount needs to be set to 0 before inserting into the idr 307 * so p9_tag_lookup does not accept a request that is not fully 308 * initialized. refcount_set to 2 below will mark request ready. 309 */ 310 refcount_set(&req->refcount, 0); 311 init_waitqueue_head(&req->wq); 312 INIT_LIST_HEAD(&req->req_list); 313 314 idr_preload(GFP_NOFS); 315 spin_lock_irq(&c->lock); 316 if (type == P9_TVERSION) 317 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1, 318 GFP_NOWAIT); 319 else 320 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT); 321 req->tc.tag = tag; 322 spin_unlock_irq(&c->lock); 323 idr_preload_end(); 324 if (tag < 0) 325 goto free; 326 327 /* Init ref to two because in the general case there is one ref 328 * that is put asynchronously by a writer thread, one ref 329 * temporarily given by p9_tag_lookup and put by p9_client_cb 330 * in the recv thread, and one ref put by p9_req_put in the 331 * main thread. The only exception is virtio that does not use 332 * p9_tag_lookup but does not have a writer thread either 333 * (the write happens synchronously in the request/zc_request 334 * callback), so p9_client_cb eats the second ref there 335 * as the pointer is duplicated directly by virtqueue_add_sgs() 336 */ 337 refcount_set(&req->refcount, 2); 338 339 return req; 340 341 free: 342 p9_fcall_fini(&req->tc); 343 p9_fcall_fini(&req->rc); 344 free_req: 345 kmem_cache_free(p9_req_cache, req); 346 return ERR_PTR(-ENOMEM); 347 } 348 349 /** 350 * p9_tag_lookup - Look up a request by tag. 351 * @c: Client session. 352 * @tag: Transaction ID. 353 * 354 * Context: Any context. 355 * Return: A request, or %NULL if there is no request with that tag. 356 */ 357 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 358 { 359 struct p9_req_t *req; 360 361 rcu_read_lock(); 362 again: 363 req = idr_find(&c->reqs, tag); 364 if (req) { 365 /* We have to be careful with the req found under rcu_read_lock 366 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the 367 * ref again without corrupting other data, then check again 368 * that the tag matches once we have the ref 369 */ 370 if (!p9_req_try_get(req)) 371 goto again; 372 if (req->tc.tag != tag) { 373 p9_req_put(c, req); 374 goto again; 375 } 376 } 377 rcu_read_unlock(); 378 379 return req; 380 } 381 EXPORT_SYMBOL(p9_tag_lookup); 382 383 /** 384 * p9_tag_remove - Remove a tag. 385 * @c: Client session. 386 * @r: Request of reference. 387 * 388 * Context: Any context. 389 */ 390 static void p9_tag_remove(struct p9_client *c, struct p9_req_t *r) 391 { 392 unsigned long flags; 393 u16 tag = r->tc.tag; 394 395 p9_debug(P9_DEBUG_MUX, "freeing clnt %p req %p tag: %d\n", c, r, tag); 396 spin_lock_irqsave(&c->lock, flags); 397 idr_remove(&c->reqs, tag); 398 spin_unlock_irqrestore(&c->lock, flags); 399 } 400 401 int p9_req_put(struct p9_client *c, struct p9_req_t *r) 402 { 403 if (refcount_dec_and_test(&r->refcount)) { 404 p9_tag_remove(c, r); 405 406 p9_fcall_fini(&r->tc); 407 p9_fcall_fini(&r->rc); 408 kmem_cache_free(p9_req_cache, r); 409 return 1; 410 } 411 return 0; 412 } 413 EXPORT_SYMBOL(p9_req_put); 414 415 /** 416 * p9_tag_cleanup - cleans up tags structure and reclaims resources 417 * @c: v9fs client struct 418 * 419 * This frees resources associated with the tags structure 420 * 421 */ 422 static void p9_tag_cleanup(struct p9_client *c) 423 { 424 struct p9_req_t *req; 425 int id; 426 427 rcu_read_lock(); 428 idr_for_each_entry(&c->reqs, req, id) { 429 pr_info("Tag %d still in use\n", id); 430 if (p9_req_put(c, req) == 0) 431 pr_warn("Packet with tag %d has still references", 432 req->tc.tag); 433 } 434 rcu_read_unlock(); 435 } 436 437 /** 438 * p9_client_cb - call back from transport to client 439 * @c: client state 440 * @req: request received 441 * @status: request status, one of REQ_STATUS_* 442 * 443 */ 444 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) 445 { 446 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); 447 448 /* This barrier is needed to make sure any change made to req before 449 * the status change is visible to another thread 450 */ 451 smp_wmb(); 452 WRITE_ONCE(req->status, status); 453 454 wake_up(&req->wq); 455 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); 456 p9_req_put(c, req); 457 } 458 EXPORT_SYMBOL(p9_client_cb); 459 460 /** 461 * p9_parse_header - parse header arguments out of a packet 462 * @pdu: packet to parse 463 * @size: size of packet 464 * @type: type of request 465 * @tag: tag of packet 466 * @rewind: set if we need to rewind offset afterwards 467 */ 468 469 int 470 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, 471 int16_t *tag, int rewind) 472 { 473 s8 r_type; 474 s16 r_tag; 475 s32 r_size; 476 int offset = pdu->offset; 477 int err; 478 479 pdu->offset = 0; 480 481 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 482 if (err) 483 goto rewind_and_exit; 484 485 if (type) 486 *type = r_type; 487 if (tag) 488 *tag = r_tag; 489 if (size) 490 *size = r_size; 491 492 if (pdu->size != r_size || r_size < 7) { 493 err = -EINVAL; 494 goto rewind_and_exit; 495 } 496 497 pdu->id = r_type; 498 pdu->tag = r_tag; 499 500 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 501 pdu->size, pdu->id, pdu->tag); 502 503 rewind_and_exit: 504 if (rewind) 505 pdu->offset = offset; 506 return err; 507 } 508 EXPORT_SYMBOL(p9_parse_header); 509 510 /** 511 * p9_check_errors - check 9p packet for error return and process it 512 * @c: current client instance 513 * @req: request to parse and check for error conditions 514 * 515 * returns error code if one is discovered, otherwise returns 0 516 * 517 * this will have to be more complicated if we have multiple 518 * error packet types 519 */ 520 521 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 522 { 523 s8 type; 524 int err; 525 int ecode; 526 527 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 528 if (req->rc.size > req->rc.capacity && !req->rc.zc) { 529 pr_err("requested packet size too big: %d does not fit %zu (type=%d)\n", 530 req->rc.size, req->rc.capacity, req->rc.id); 531 return -EIO; 532 } 533 /* dump the response from server 534 * This should be after check errors which poplulate pdu_fcall. 535 */ 536 trace_9p_protocol_dump(c, &req->rc); 537 if (err) { 538 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 539 return err; 540 } 541 if (type != P9_RERROR && type != P9_RLERROR) 542 return 0; 543 544 if (!p9_is_proto_dotl(c)) { 545 char *ename = NULL; 546 547 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 548 &ename, &ecode); 549 if (err) { 550 kfree(ename); 551 goto out_err; 552 } 553 554 if (p9_is_proto_dotu(c) && ecode < 512) 555 err = -ecode; 556 557 if (!err) { 558 err = p9_errstr2errno(ename, strlen(ename)); 559 560 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 561 -ecode, ename); 562 } 563 kfree(ename); 564 } else { 565 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 566 if (err) 567 goto out_err; 568 err = -ecode; 569 570 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 571 } 572 573 return err; 574 575 out_err: 576 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 577 578 return err; 579 } 580 581 static struct p9_req_t * 582 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 583 584 /** 585 * p9_client_flush - flush (cancel) a request 586 * @c: client state 587 * @oldreq: request to cancel 588 * 589 * This sents a flush for a particular request and links 590 * the flush request to the original request. The current 591 * code only supports a single flush request although the protocol 592 * allows for multiple flush requests to be sent for a single request. 593 * 594 */ 595 596 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 597 { 598 struct p9_req_t *req; 599 s16 oldtag; 600 int err; 601 602 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); 603 if (err) 604 return err; 605 606 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 607 608 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 609 if (IS_ERR(req)) 610 return PTR_ERR(req); 611 612 /* if we haven't received a response for oldreq, 613 * remove it from the list 614 */ 615 if (READ_ONCE(oldreq->status) == REQ_STATUS_SENT) { 616 if (c->trans_mod->cancelled) 617 c->trans_mod->cancelled(c, oldreq); 618 } 619 620 p9_req_put(c, req); 621 return 0; 622 } 623 624 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 625 int8_t type, uint t_size, uint r_size, 626 const char *fmt, va_list ap) 627 { 628 int err; 629 struct p9_req_t *req; 630 va_list apc; 631 632 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 633 634 /* we allow for any status other than disconnected */ 635 if (c->status == Disconnected) 636 return ERR_PTR(-EIO); 637 638 /* if status is begin_disconnected we allow only clunk request */ 639 if (c->status == BeginDisconnect && type != P9_TCLUNK) 640 return ERR_PTR(-EIO); 641 642 va_copy(apc, ap); 643 req = p9_tag_alloc(c, type, t_size, r_size, fmt, apc); 644 va_end(apc); 645 if (IS_ERR(req)) 646 return req; 647 648 /* marshall the data */ 649 p9pdu_prepare(&req->tc, req->tc.tag, type); 650 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); 651 if (err) 652 goto reterr; 653 p9pdu_finalize(c, &req->tc); 654 trace_9p_client_req(c, type, req->tc.tag); 655 return req; 656 reterr: 657 p9_req_put(c, req); 658 /* We have to put also the 2nd reference as it won't be used */ 659 p9_req_put(c, req); 660 return ERR_PTR(err); 661 } 662 663 /** 664 * p9_client_rpc - issue a request and wait for a response 665 * @c: client session 666 * @type: type of request 667 * @fmt: protocol format string (see protocol.c) 668 * 669 * Returns request structure (which client must free using p9_req_put) 670 */ 671 672 static struct p9_req_t * 673 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 674 { 675 va_list ap; 676 int sigpending, err; 677 unsigned long flags; 678 struct p9_req_t *req; 679 /* Passing zero for tsize/rsize to p9_client_prepare_req() tells it to 680 * auto determine an appropriate (small) request/response size 681 * according to actual message data being sent. Currently RDMA 682 * transport is excluded from this response message size optimization, 683 * as it would not cope with it, due to its pooled response buffers 684 * (using an optimized request size for RDMA as well though). 685 */ 686 const uint tsize = 0; 687 const uint rsize = c->trans_mod->pooled_rbuffers ? c->msize : 0; 688 689 va_start(ap, fmt); 690 req = p9_client_prepare_req(c, type, tsize, rsize, fmt, ap); 691 va_end(ap); 692 if (IS_ERR(req)) 693 return req; 694 695 req->tc.zc = false; 696 req->rc.zc = false; 697 698 if (signal_pending(current)) { 699 sigpending = 1; 700 clear_thread_flag(TIF_SIGPENDING); 701 } else { 702 sigpending = 0; 703 } 704 705 err = c->trans_mod->request(c, req); 706 if (err < 0) { 707 /* write won't happen */ 708 p9_req_put(c, req); 709 if (err != -ERESTARTSYS && err != -EFAULT) 710 c->status = Disconnected; 711 goto recalc_sigpending; 712 } 713 again: 714 /* Wait for the response */ 715 err = wait_event_killable(req->wq, 716 READ_ONCE(req->status) >= REQ_STATUS_RCVD); 717 718 /* Make sure our req is coherent with regard to updates in other 719 * threads - echoes to wmb() in the callback 720 */ 721 smp_rmb(); 722 723 if (err == -ERESTARTSYS && c->status == Connected && 724 type == P9_TFLUSH) { 725 sigpending = 1; 726 clear_thread_flag(TIF_SIGPENDING); 727 goto again; 728 } 729 730 if (READ_ONCE(req->status) == REQ_STATUS_ERROR) { 731 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 732 err = req->t_err; 733 } 734 if (err == -ERESTARTSYS && c->status == Connected) { 735 p9_debug(P9_DEBUG_MUX, "flushing\n"); 736 sigpending = 1; 737 clear_thread_flag(TIF_SIGPENDING); 738 739 if (c->trans_mod->cancel(c, req)) 740 p9_client_flush(c, req); 741 742 /* if we received the response anyway, don't signal error */ 743 if (READ_ONCE(req->status) == REQ_STATUS_RCVD) 744 err = 0; 745 } 746 recalc_sigpending: 747 if (sigpending) { 748 spin_lock_irqsave(¤t->sighand->siglock, flags); 749 recalc_sigpending(); 750 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 751 } 752 if (err < 0) 753 goto reterr; 754 755 err = p9_check_errors(c, req); 756 trace_9p_client_res(c, type, req->rc.tag, err); 757 if (!err) 758 return req; 759 reterr: 760 p9_req_put(c, req); 761 return ERR_PTR(safe_errno(err)); 762 } 763 764 /** 765 * p9_client_zc_rpc - issue a request and wait for a response 766 * @c: client session 767 * @type: type of request 768 * @uidata: destination for zero copy read 769 * @uodata: source for zero copy write 770 * @inlen: read buffer size 771 * @olen: write buffer size 772 * @in_hdrlen: reader header size, This is the size of response protocol data 773 * @fmt: protocol format string (see protocol.c) 774 * 775 * Returns request structure (which client must free using p9_req_put) 776 */ 777 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 778 struct iov_iter *uidata, 779 struct iov_iter *uodata, 780 int inlen, int olen, int in_hdrlen, 781 const char *fmt, ...) 782 { 783 va_list ap; 784 int sigpending, err; 785 unsigned long flags; 786 struct p9_req_t *req; 787 788 va_start(ap, fmt); 789 /* We allocate a inline protocol data of only 4k bytes. 790 * The actual content is passed in zero-copy fashion. 791 */ 792 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, P9_ZC_HDR_SZ, fmt, ap); 793 va_end(ap); 794 if (IS_ERR(req)) 795 return req; 796 797 req->tc.zc = true; 798 req->rc.zc = true; 799 800 if (signal_pending(current)) { 801 sigpending = 1; 802 clear_thread_flag(TIF_SIGPENDING); 803 } else { 804 sigpending = 0; 805 } 806 807 err = c->trans_mod->zc_request(c, req, uidata, uodata, 808 inlen, olen, in_hdrlen); 809 if (err < 0) { 810 if (err == -EIO) 811 c->status = Disconnected; 812 if (err != -ERESTARTSYS) 813 goto recalc_sigpending; 814 } 815 if (READ_ONCE(req->status) == REQ_STATUS_ERROR) { 816 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 817 err = req->t_err; 818 } 819 if (err == -ERESTARTSYS && c->status == Connected) { 820 p9_debug(P9_DEBUG_MUX, "flushing\n"); 821 sigpending = 1; 822 clear_thread_flag(TIF_SIGPENDING); 823 824 if (c->trans_mod->cancel(c, req)) 825 p9_client_flush(c, req); 826 827 /* if we received the response anyway, don't signal error */ 828 if (READ_ONCE(req->status) == REQ_STATUS_RCVD) 829 err = 0; 830 } 831 recalc_sigpending: 832 if (sigpending) { 833 spin_lock_irqsave(¤t->sighand->siglock, flags); 834 recalc_sigpending(); 835 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 836 } 837 if (err < 0) 838 goto reterr; 839 840 err = p9_check_errors(c, req); 841 trace_9p_client_res(c, type, req->rc.tag, err); 842 if (!err) 843 return req; 844 reterr: 845 p9_req_put(c, req); 846 return ERR_PTR(safe_errno(err)); 847 } 848 849 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 850 { 851 int ret; 852 struct p9_fid *fid; 853 854 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 855 fid = kzalloc(sizeof(*fid), GFP_KERNEL); 856 if (!fid) 857 return NULL; 858 859 fid->mode = -1; 860 fid->uid = current_fsuid(); 861 fid->clnt = clnt; 862 refcount_set(&fid->count, 1); 863 864 idr_preload(GFP_KERNEL); 865 spin_lock_irq(&clnt->lock); 866 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, 867 GFP_NOWAIT); 868 spin_unlock_irq(&clnt->lock); 869 idr_preload_end(); 870 if (!ret) { 871 trace_9p_fid_ref(fid, P9_FID_REF_CREATE); 872 return fid; 873 } 874 875 kfree(fid); 876 return NULL; 877 } 878 879 static void p9_fid_destroy(struct p9_fid *fid) 880 { 881 struct p9_client *clnt; 882 unsigned long flags; 883 884 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 885 trace_9p_fid_ref(fid, P9_FID_REF_DESTROY); 886 clnt = fid->clnt; 887 spin_lock_irqsave(&clnt->lock, flags); 888 idr_remove(&clnt->fids, fid->fid); 889 spin_unlock_irqrestore(&clnt->lock, flags); 890 kfree(fid->rdir); 891 kfree(fid); 892 } 893 894 /* We also need to export tracepoint symbols for tracepoint_enabled() */ 895 EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref); 896 897 void do_trace_9p_fid_get(struct p9_fid *fid) 898 { 899 trace_9p_fid_ref(fid, P9_FID_REF_GET); 900 } 901 EXPORT_SYMBOL(do_trace_9p_fid_get); 902 903 void do_trace_9p_fid_put(struct p9_fid *fid) 904 { 905 trace_9p_fid_ref(fid, P9_FID_REF_PUT); 906 } 907 EXPORT_SYMBOL(do_trace_9p_fid_put); 908 909 static int p9_client_version(struct p9_client *c) 910 { 911 int err; 912 struct p9_req_t *req; 913 char *version = NULL; 914 int msize; 915 916 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 917 c->msize, c->proto_version); 918 919 switch (c->proto_version) { 920 case p9_proto_2000L: 921 req = p9_client_rpc(c, P9_TVERSION, "ds", 922 c->msize, "9P2000.L"); 923 break; 924 case p9_proto_2000u: 925 req = p9_client_rpc(c, P9_TVERSION, "ds", 926 c->msize, "9P2000.u"); 927 break; 928 case p9_proto_legacy: 929 req = p9_client_rpc(c, P9_TVERSION, "ds", 930 c->msize, "9P2000"); 931 break; 932 default: 933 return -EINVAL; 934 } 935 936 if (IS_ERR(req)) 937 return PTR_ERR(req); 938 939 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); 940 if (err) { 941 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 942 trace_9p_protocol_dump(c, &req->rc); 943 goto error; 944 } 945 946 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 947 if (!strncmp(version, "9P2000.L", 8)) { 948 c->proto_version = p9_proto_2000L; 949 } else if (!strncmp(version, "9P2000.u", 8)) { 950 c->proto_version = p9_proto_2000u; 951 } else if (!strncmp(version, "9P2000", 6)) { 952 c->proto_version = p9_proto_legacy; 953 } else { 954 p9_debug(P9_DEBUG_ERROR, 955 "server returned an unknown version: %s\n", version); 956 err = -EREMOTEIO; 957 goto error; 958 } 959 960 if (msize < 4096) { 961 p9_debug(P9_DEBUG_ERROR, 962 "server returned a msize < 4096: %d\n", msize); 963 err = -EREMOTEIO; 964 goto error; 965 } 966 if (msize < c->msize) 967 c->msize = msize; 968 969 error: 970 kfree(version); 971 p9_req_put(c, req); 972 973 return err; 974 } 975 976 struct p9_client *p9_client_create(const char *dev_name, char *options) 977 { 978 int err; 979 struct p9_client *clnt; 980 char *client_id; 981 char *cache_name; 982 983 clnt = kmalloc(sizeof(*clnt), GFP_KERNEL); 984 if (!clnt) 985 return ERR_PTR(-ENOMEM); 986 987 clnt->trans_mod = NULL; 988 clnt->trans = NULL; 989 clnt->fcall_cache = NULL; 990 991 client_id = utsname()->nodename; 992 memcpy(clnt->name, client_id, strlen(client_id) + 1); 993 994 spin_lock_init(&clnt->lock); 995 idr_init(&clnt->fids); 996 idr_init(&clnt->reqs); 997 998 err = parse_opts(options, clnt); 999 if (err < 0) 1000 goto free_client; 1001 1002 if (!clnt->trans_mod) 1003 clnt->trans_mod = v9fs_get_default_trans(); 1004 1005 if (!clnt->trans_mod) { 1006 err = -EPROTONOSUPPORT; 1007 p9_debug(P9_DEBUG_ERROR, 1008 "No transport defined or default transport\n"); 1009 goto free_client; 1010 } 1011 1012 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1013 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1014 1015 err = clnt->trans_mod->create(clnt, dev_name, options); 1016 if (err) 1017 goto put_trans; 1018 1019 if (clnt->msize > clnt->trans_mod->maxsize) { 1020 clnt->msize = clnt->trans_mod->maxsize; 1021 pr_info("Limiting 'msize' to %d as this is the maximum " 1022 "supported by transport %s\n", 1023 clnt->msize, clnt->trans_mod->name 1024 ); 1025 } 1026 1027 if (clnt->msize < 4096) { 1028 p9_debug(P9_DEBUG_ERROR, 1029 "Please specify a msize of at least 4k\n"); 1030 err = -EINVAL; 1031 goto close_trans; 1032 } 1033 1034 err = p9_client_version(clnt); 1035 if (err) 1036 goto close_trans; 1037 1038 cache_name = kasprintf(GFP_KERNEL, "9p-fcall-cache-%s", dev_name); 1039 if (!cache_name) { 1040 err = -ENOMEM; 1041 goto close_trans; 1042 } 1043 1044 /* P9_HDRSZ + 4 is the smallest packet header we can have that is 1045 * followed by data accessed from userspace by read 1046 */ 1047 clnt->fcall_cache = 1048 kmem_cache_create_usercopy(cache_name, clnt->msize, 1049 0, 0, P9_HDRSZ + 4, 1050 clnt->msize - (P9_HDRSZ + 4), 1051 NULL); 1052 1053 kfree(cache_name); 1054 return clnt; 1055 1056 close_trans: 1057 clnt->trans_mod->close(clnt); 1058 put_trans: 1059 v9fs_put_trans(clnt->trans_mod); 1060 free_client: 1061 kfree(clnt); 1062 return ERR_PTR(err); 1063 } 1064 EXPORT_SYMBOL(p9_client_create); 1065 1066 void p9_client_destroy(struct p9_client *clnt) 1067 { 1068 struct p9_fid *fid; 1069 int id; 1070 1071 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1072 1073 if (clnt->trans_mod) 1074 clnt->trans_mod->close(clnt); 1075 1076 v9fs_put_trans(clnt->trans_mod); 1077 1078 idr_for_each_entry(&clnt->fids, fid, id) { 1079 pr_info("Found fid %d not clunked\n", fid->fid); 1080 p9_fid_destroy(fid); 1081 } 1082 1083 p9_tag_cleanup(clnt); 1084 1085 kmem_cache_destroy(clnt->fcall_cache); 1086 kfree(clnt); 1087 } 1088 EXPORT_SYMBOL(p9_client_destroy); 1089 1090 void p9_client_disconnect(struct p9_client *clnt) 1091 { 1092 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1093 clnt->status = Disconnected; 1094 } 1095 EXPORT_SYMBOL(p9_client_disconnect); 1096 1097 void p9_client_begin_disconnect(struct p9_client *clnt) 1098 { 1099 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1100 clnt->status = BeginDisconnect; 1101 } 1102 EXPORT_SYMBOL(p9_client_begin_disconnect); 1103 1104 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1105 const char *uname, kuid_t n_uname, 1106 const char *aname) 1107 { 1108 int err; 1109 struct p9_req_t *req; 1110 struct p9_fid *fid; 1111 struct p9_qid qid; 1112 1113 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1114 afid ? afid->fid : -1, uname, aname); 1115 fid = p9_fid_create(clnt); 1116 if (!fid) { 1117 err = -ENOMEM; 1118 goto error; 1119 } 1120 fid->uid = n_uname; 1121 1122 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1123 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1124 if (IS_ERR(req)) { 1125 err = PTR_ERR(req); 1126 goto error; 1127 } 1128 1129 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); 1130 if (err) { 1131 trace_9p_protocol_dump(clnt, &req->rc); 1132 p9_req_put(clnt, req); 1133 goto error; 1134 } 1135 1136 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1137 qid.type, qid.path, qid.version); 1138 1139 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1140 1141 p9_req_put(clnt, req); 1142 return fid; 1143 1144 error: 1145 if (fid) 1146 p9_fid_destroy(fid); 1147 return ERR_PTR(err); 1148 } 1149 EXPORT_SYMBOL(p9_client_attach); 1150 1151 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1152 const unsigned char * const *wnames, int clone) 1153 { 1154 int err; 1155 struct p9_client *clnt; 1156 struct p9_fid *fid; 1157 struct p9_qid *wqids; 1158 struct p9_req_t *req; 1159 u16 nwqids, count; 1160 1161 wqids = NULL; 1162 clnt = oldfid->clnt; 1163 if (clone) { 1164 fid = p9_fid_create(clnt); 1165 if (!fid) { 1166 err = -ENOMEM; 1167 goto error; 1168 } 1169 1170 fid->uid = oldfid->uid; 1171 } else { 1172 fid = oldfid; 1173 } 1174 1175 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1176 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1177 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1178 nwname, wnames); 1179 if (IS_ERR(req)) { 1180 err = PTR_ERR(req); 1181 goto error; 1182 } 1183 1184 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1185 if (err) { 1186 trace_9p_protocol_dump(clnt, &req->rc); 1187 p9_req_put(clnt, req); 1188 goto clunk_fid; 1189 } 1190 p9_req_put(clnt, req); 1191 1192 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1193 1194 if (nwqids != nwname) { 1195 err = -ENOENT; 1196 goto clunk_fid; 1197 } 1198 1199 for (count = 0; count < nwqids; count++) 1200 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1201 count, wqids[count].type, 1202 wqids[count].path, 1203 wqids[count].version); 1204 1205 if (nwname) 1206 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1207 else 1208 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); 1209 1210 kfree(wqids); 1211 return fid; 1212 1213 clunk_fid: 1214 kfree(wqids); 1215 p9_fid_put(fid); 1216 fid = NULL; 1217 1218 error: 1219 if (fid && fid != oldfid) 1220 p9_fid_destroy(fid); 1221 1222 return ERR_PTR(err); 1223 } 1224 EXPORT_SYMBOL(p9_client_walk); 1225 1226 int p9_client_open(struct p9_fid *fid, int mode) 1227 { 1228 int err; 1229 struct p9_client *clnt; 1230 struct p9_req_t *req; 1231 struct p9_qid qid; 1232 int iounit; 1233 1234 clnt = fid->clnt; 1235 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1236 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1237 1238 if (fid->mode != -1) 1239 return -EINVAL; 1240 1241 if (p9_is_proto_dotl(clnt)) 1242 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode & P9L_MODE_MASK); 1243 else 1244 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode & P9L_MODE_MASK); 1245 if (IS_ERR(req)) { 1246 err = PTR_ERR(req); 1247 goto error; 1248 } 1249 1250 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1251 if (err) { 1252 trace_9p_protocol_dump(clnt, &req->rc); 1253 goto free_and_error; 1254 } 1255 1256 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1257 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1258 qid.path, qid.version, iounit); 1259 1260 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1261 fid->mode = mode; 1262 fid->iounit = iounit; 1263 1264 free_and_error: 1265 p9_req_put(clnt, req); 1266 error: 1267 return err; 1268 } 1269 EXPORT_SYMBOL(p9_client_open); 1270 1271 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, 1272 u32 mode, kgid_t gid, struct p9_qid *qid) 1273 { 1274 int err; 1275 struct p9_client *clnt; 1276 struct p9_req_t *req; 1277 int iounit; 1278 1279 p9_debug(P9_DEBUG_9P, 1280 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1281 ofid->fid, name, flags, mode, 1282 from_kgid(&init_user_ns, gid)); 1283 clnt = ofid->clnt; 1284 1285 if (ofid->mode != -1) 1286 return -EINVAL; 1287 1288 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1289 mode & P9L_MODE_MASK, gid); 1290 if (IS_ERR(req)) { 1291 err = PTR_ERR(req); 1292 goto error; 1293 } 1294 1295 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); 1296 if (err) { 1297 trace_9p_protocol_dump(clnt, &req->rc); 1298 goto free_and_error; 1299 } 1300 1301 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1302 qid->type, qid->path, qid->version, iounit); 1303 1304 memmove(&ofid->qid, qid, sizeof(struct p9_qid)); 1305 ofid->mode = flags; 1306 ofid->iounit = iounit; 1307 1308 free_and_error: 1309 p9_req_put(clnt, req); 1310 error: 1311 return err; 1312 } 1313 EXPORT_SYMBOL(p9_client_create_dotl); 1314 1315 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1316 char *extension) 1317 { 1318 int err; 1319 struct p9_client *clnt; 1320 struct p9_req_t *req; 1321 struct p9_qid qid; 1322 int iounit; 1323 1324 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1325 fid->fid, name, perm, mode); 1326 clnt = fid->clnt; 1327 1328 if (fid->mode != -1) 1329 return -EINVAL; 1330 1331 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1332 mode & P9L_MODE_MASK, extension); 1333 if (IS_ERR(req)) { 1334 err = PTR_ERR(req); 1335 goto error; 1336 } 1337 1338 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1339 if (err) { 1340 trace_9p_protocol_dump(clnt, &req->rc); 1341 goto free_and_error; 1342 } 1343 1344 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1345 qid.type, qid.path, qid.version, iounit); 1346 1347 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1348 fid->mode = mode; 1349 fid->iounit = iounit; 1350 1351 free_and_error: 1352 p9_req_put(clnt, req); 1353 error: 1354 return err; 1355 } 1356 EXPORT_SYMBOL(p9_client_fcreate); 1357 1358 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1359 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1360 { 1361 int err; 1362 struct p9_client *clnt; 1363 struct p9_req_t *req; 1364 1365 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1366 dfid->fid, name, symtgt); 1367 clnt = dfid->clnt; 1368 1369 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1370 gid); 1371 if (IS_ERR(req)) { 1372 err = PTR_ERR(req); 1373 goto error; 1374 } 1375 1376 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 1377 if (err) { 1378 trace_9p_protocol_dump(clnt, &req->rc); 1379 goto free_and_error; 1380 } 1381 1382 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1383 qid->type, qid->path, qid->version); 1384 1385 free_and_error: 1386 p9_req_put(clnt, req); 1387 error: 1388 return err; 1389 } 1390 EXPORT_SYMBOL(p9_client_symlink); 1391 1392 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1393 { 1394 struct p9_client *clnt; 1395 struct p9_req_t *req; 1396 1397 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1398 dfid->fid, oldfid->fid, newname); 1399 clnt = dfid->clnt; 1400 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1401 newname); 1402 if (IS_ERR(req)) 1403 return PTR_ERR(req); 1404 1405 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1406 p9_req_put(clnt, req); 1407 return 0; 1408 } 1409 EXPORT_SYMBOL(p9_client_link); 1410 1411 int p9_client_fsync(struct p9_fid *fid, int datasync) 1412 { 1413 int err = 0; 1414 struct p9_client *clnt; 1415 struct p9_req_t *req; 1416 1417 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1418 fid->fid, datasync); 1419 clnt = fid->clnt; 1420 1421 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1422 if (IS_ERR(req)) { 1423 err = PTR_ERR(req); 1424 goto error; 1425 } 1426 1427 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1428 1429 p9_req_put(clnt, req); 1430 1431 error: 1432 return err; 1433 } 1434 EXPORT_SYMBOL(p9_client_fsync); 1435 1436 int p9_client_clunk(struct p9_fid *fid) 1437 { 1438 int err = 0; 1439 struct p9_client *clnt; 1440 struct p9_req_t *req; 1441 int retries = 0; 1442 1443 again: 1444 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", 1445 fid->fid, retries); 1446 clnt = fid->clnt; 1447 1448 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1449 if (IS_ERR(req)) { 1450 err = PTR_ERR(req); 1451 goto error; 1452 } 1453 1454 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1455 1456 p9_req_put(clnt, req); 1457 error: 1458 /* Fid is not valid even after a failed clunk 1459 * If interrupted, retry once then give up and 1460 * leak fid until umount. 1461 */ 1462 if (err == -ERESTARTSYS) { 1463 if (retries++ == 0) 1464 goto again; 1465 } else { 1466 p9_fid_destroy(fid); 1467 } 1468 return err; 1469 } 1470 EXPORT_SYMBOL(p9_client_clunk); 1471 1472 int p9_client_remove(struct p9_fid *fid) 1473 { 1474 int err = 0; 1475 struct p9_client *clnt; 1476 struct p9_req_t *req; 1477 1478 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1479 clnt = fid->clnt; 1480 1481 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1482 if (IS_ERR(req)) { 1483 err = PTR_ERR(req); 1484 goto error; 1485 } 1486 1487 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1488 1489 p9_req_put(clnt, req); 1490 error: 1491 if (err == -ERESTARTSYS) 1492 p9_fid_put(fid); 1493 else 1494 p9_fid_destroy(fid); 1495 return err; 1496 } 1497 EXPORT_SYMBOL(p9_client_remove); 1498 1499 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1500 { 1501 int err = 0; 1502 struct p9_req_t *req; 1503 struct p9_client *clnt; 1504 1505 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1506 dfid->fid, name, flags); 1507 1508 clnt = dfid->clnt; 1509 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1510 if (IS_ERR(req)) { 1511 err = PTR_ERR(req); 1512 goto error; 1513 } 1514 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1515 1516 p9_req_put(clnt, req); 1517 error: 1518 return err; 1519 } 1520 EXPORT_SYMBOL(p9_client_unlinkat); 1521 1522 int 1523 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1524 { 1525 int total = 0; 1526 *err = 0; 1527 1528 while (iov_iter_count(to)) { 1529 int count; 1530 1531 count = p9_client_read_once(fid, offset, to, err); 1532 if (!count || *err) 1533 break; 1534 offset += count; 1535 total += count; 1536 } 1537 return total; 1538 } 1539 EXPORT_SYMBOL(p9_client_read); 1540 1541 int 1542 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, 1543 int *err) 1544 { 1545 struct p9_client *clnt = fid->clnt; 1546 struct p9_req_t *req; 1547 int count = iov_iter_count(to); 1548 int rsize, received, non_zc = 0; 1549 char *dataptr; 1550 1551 *err = 0; 1552 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n", 1553 fid->fid, offset, iov_iter_count(to)); 1554 1555 rsize = fid->iounit; 1556 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1557 rsize = clnt->msize - P9_IOHDRSZ; 1558 1559 if (count < rsize) 1560 rsize = count; 1561 1562 /* Don't bother zerocopy for small IO (< 1024) */ 1563 if (clnt->trans_mod->zc_request && rsize > 1024) { 1564 /* response header len is 11 1565 * PDU Header(7) + IO Size (4) 1566 */ 1567 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1568 0, 11, "dqd", fid->fid, 1569 offset, rsize); 1570 } else { 1571 non_zc = 1; 1572 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1573 rsize); 1574 } 1575 if (IS_ERR(req)) { 1576 *err = PTR_ERR(req); 1577 if (!non_zc) 1578 iov_iter_revert(to, count - iov_iter_count(to)); 1579 return 0; 1580 } 1581 1582 *err = p9pdu_readf(&req->rc, clnt->proto_version, 1583 "D", &received, &dataptr); 1584 if (*err) { 1585 if (!non_zc) 1586 iov_iter_revert(to, count - iov_iter_count(to)); 1587 trace_9p_protocol_dump(clnt, &req->rc); 1588 p9_req_put(clnt, req); 1589 return 0; 1590 } 1591 if (rsize < received) { 1592 pr_err("bogus RREAD count (%d > %d)\n", received, rsize); 1593 received = rsize; 1594 } 1595 1596 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", received); 1597 1598 if (non_zc) { 1599 int n = copy_to_iter(dataptr, received, to); 1600 1601 if (n != received) { 1602 *err = -EFAULT; 1603 p9_req_put(clnt, req); 1604 return n; 1605 } 1606 } else { 1607 iov_iter_revert(to, count - received - iov_iter_count(to)); 1608 } 1609 p9_req_put(clnt, req); 1610 return received; 1611 } 1612 EXPORT_SYMBOL(p9_client_read_once); 1613 1614 int 1615 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1616 { 1617 struct p9_client *clnt = fid->clnt; 1618 struct p9_req_t *req; 1619 int total = 0; 1620 *err = 0; 1621 1622 while (iov_iter_count(from)) { 1623 int count = iov_iter_count(from); 1624 int rsize = fid->iounit; 1625 int written; 1626 1627 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1628 rsize = clnt->msize - P9_IOHDRSZ; 1629 1630 if (count < rsize) 1631 rsize = count; 1632 1633 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d (/%d)\n", 1634 fid->fid, offset, rsize, count); 1635 1636 /* Don't bother zerocopy for small IO (< 1024) */ 1637 if (clnt->trans_mod->zc_request && rsize > 1024) { 1638 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1639 rsize, P9_ZC_HDR_SZ, "dqd", 1640 fid->fid, offset, rsize); 1641 } else { 1642 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1643 offset, rsize, from); 1644 } 1645 if (IS_ERR(req)) { 1646 iov_iter_revert(from, count - iov_iter_count(from)); 1647 *err = PTR_ERR(req); 1648 break; 1649 } 1650 1651 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written); 1652 if (*err) { 1653 iov_iter_revert(from, count - iov_iter_count(from)); 1654 trace_9p_protocol_dump(clnt, &req->rc); 1655 p9_req_put(clnt, req); 1656 break; 1657 } 1658 if (rsize < written) { 1659 pr_err("bogus RWRITE count (%d > %d)\n", written, rsize); 1660 written = rsize; 1661 } 1662 1663 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", written); 1664 1665 p9_req_put(clnt, req); 1666 iov_iter_revert(from, count - written - iov_iter_count(from)); 1667 total += written; 1668 offset += written; 1669 } 1670 return total; 1671 } 1672 EXPORT_SYMBOL(p9_client_write); 1673 1674 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1675 { 1676 int err; 1677 struct p9_client *clnt; 1678 struct p9_wstat *ret; 1679 struct p9_req_t *req; 1680 u16 ignored; 1681 1682 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1683 1684 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1685 if (!ret) 1686 return ERR_PTR(-ENOMEM); 1687 1688 clnt = fid->clnt; 1689 1690 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1691 if (IS_ERR(req)) { 1692 err = PTR_ERR(req); 1693 goto error; 1694 } 1695 1696 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); 1697 if (err) { 1698 trace_9p_protocol_dump(clnt, &req->rc); 1699 p9_req_put(clnt, req); 1700 goto error; 1701 } 1702 1703 p9_debug(P9_DEBUG_9P, 1704 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1705 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1706 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1707 "<<< uid=%d gid=%d n_muid=%d\n", 1708 ret->size, ret->type, ret->dev, ret->qid.type, ret->qid.path, 1709 ret->qid.version, ret->mode, 1710 ret->atime, ret->mtime, ret->length, 1711 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1712 from_kuid(&init_user_ns, ret->n_uid), 1713 from_kgid(&init_user_ns, ret->n_gid), 1714 from_kuid(&init_user_ns, ret->n_muid)); 1715 1716 p9_req_put(clnt, req); 1717 return ret; 1718 1719 error: 1720 kfree(ret); 1721 return ERR_PTR(err); 1722 } 1723 EXPORT_SYMBOL(p9_client_stat); 1724 1725 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1726 u64 request_mask) 1727 { 1728 int err; 1729 struct p9_client *clnt; 1730 struct p9_stat_dotl *ret; 1731 struct p9_req_t *req; 1732 1733 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1734 fid->fid, request_mask); 1735 1736 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1737 if (!ret) 1738 return ERR_PTR(-ENOMEM); 1739 1740 clnt = fid->clnt; 1741 1742 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1743 if (IS_ERR(req)) { 1744 err = PTR_ERR(req); 1745 goto error; 1746 } 1747 1748 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); 1749 if (err) { 1750 trace_9p_protocol_dump(clnt, &req->rc); 1751 p9_req_put(clnt, req); 1752 goto error; 1753 } 1754 1755 p9_debug(P9_DEBUG_9P, "<<< RGETATTR st_result_mask=%lld\n" 1756 "<<< qid=%x.%llx.%x\n" 1757 "<<< st_mode=%8.8x st_nlink=%llu\n" 1758 "<<< st_uid=%d st_gid=%d\n" 1759 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1760 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1761 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1762 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1763 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1764 "<<< st_gen=%lld st_data_version=%lld\n", 1765 ret->st_result_mask, 1766 ret->qid.type, ret->qid.path, ret->qid.version, 1767 ret->st_mode, ret->st_nlink, 1768 from_kuid(&init_user_ns, ret->st_uid), 1769 from_kgid(&init_user_ns, ret->st_gid), 1770 ret->st_rdev, ret->st_size, ret->st_blksize, ret->st_blocks, 1771 ret->st_atime_sec, ret->st_atime_nsec, 1772 ret->st_mtime_sec, ret->st_mtime_nsec, 1773 ret->st_ctime_sec, ret->st_ctime_nsec, 1774 ret->st_btime_sec, ret->st_btime_nsec, 1775 ret->st_gen, ret->st_data_version); 1776 1777 p9_req_put(clnt, req); 1778 return ret; 1779 1780 error: 1781 kfree(ret); 1782 return ERR_PTR(err); 1783 } 1784 EXPORT_SYMBOL(p9_client_getattr_dotl); 1785 1786 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1787 { 1788 int ret; 1789 1790 /* NOTE: size shouldn't include its own length */ 1791 /* size[2] type[2] dev[4] qid[13] */ 1792 /* mode[4] atime[4] mtime[4] length[8]*/ 1793 /* name[s] uid[s] gid[s] muid[s] */ 1794 ret = 2 + 4 + 13 + 4 + 4 + 4 + 8 + 2 + 2 + 2 + 2; 1795 1796 if (wst->name) 1797 ret += strlen(wst->name); 1798 if (wst->uid) 1799 ret += strlen(wst->uid); 1800 if (wst->gid) 1801 ret += strlen(wst->gid); 1802 if (wst->muid) 1803 ret += strlen(wst->muid); 1804 1805 if (proto_version == p9_proto_2000u || 1806 proto_version == p9_proto_2000L) { 1807 /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1808 ret += 2 + 4 + 4 + 4; 1809 if (wst->extension) 1810 ret += strlen(wst->extension); 1811 } 1812 1813 return ret; 1814 } 1815 1816 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1817 { 1818 int err = 0; 1819 struct p9_req_t *req; 1820 struct p9_client *clnt; 1821 1822 clnt = fid->clnt; 1823 wst->size = p9_client_statsize(wst, clnt->proto_version); 1824 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", 1825 fid->fid); 1826 p9_debug(P9_DEBUG_9P, 1827 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1828 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1829 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1830 " uid=%d gid=%d n_muid=%d\n", 1831 wst->size, wst->type, wst->dev, wst->qid.type, 1832 wst->qid.path, wst->qid.version, 1833 wst->mode, wst->atime, wst->mtime, wst->length, 1834 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1835 from_kuid(&init_user_ns, wst->n_uid), 1836 from_kgid(&init_user_ns, wst->n_gid), 1837 from_kuid(&init_user_ns, wst->n_muid)); 1838 1839 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", 1840 fid->fid, wst->size + 2, wst); 1841 if (IS_ERR(req)) { 1842 err = PTR_ERR(req); 1843 goto error; 1844 } 1845 1846 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1847 1848 p9_req_put(clnt, req); 1849 error: 1850 return err; 1851 } 1852 EXPORT_SYMBOL(p9_client_wstat); 1853 1854 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1855 { 1856 int err = 0; 1857 struct p9_req_t *req; 1858 struct p9_client *clnt; 1859 1860 clnt = fid->clnt; 1861 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1862 p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n", 1863 p9attr->valid, p9attr->mode, 1864 from_kuid(&init_user_ns, p9attr->uid), 1865 from_kgid(&init_user_ns, p9attr->gid), 1866 p9attr->size); 1867 p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n", 1868 p9attr->atime_sec, p9attr->atime_nsec); 1869 p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n", 1870 p9attr->mtime_sec, p9attr->mtime_nsec); 1871 1872 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1873 1874 if (IS_ERR(req)) { 1875 err = PTR_ERR(req); 1876 goto error; 1877 } 1878 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1879 p9_req_put(clnt, req); 1880 error: 1881 return err; 1882 } 1883 EXPORT_SYMBOL(p9_client_setattr); 1884 1885 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1886 { 1887 int err; 1888 struct p9_req_t *req; 1889 struct p9_client *clnt; 1890 1891 clnt = fid->clnt; 1892 1893 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1894 1895 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1896 if (IS_ERR(req)) { 1897 err = PTR_ERR(req); 1898 goto error; 1899 } 1900 1901 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1902 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1903 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1904 if (err) { 1905 trace_9p_protocol_dump(clnt, &req->rc); 1906 p9_req_put(clnt, req); 1907 goto error; 1908 } 1909 1910 p9_debug(P9_DEBUG_9P, 1911 "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n", 1912 fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree, 1913 sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen); 1914 1915 p9_req_put(clnt, req); 1916 error: 1917 return err; 1918 } 1919 EXPORT_SYMBOL(p9_client_statfs); 1920 1921 int p9_client_rename(struct p9_fid *fid, 1922 struct p9_fid *newdirfid, const char *name) 1923 { 1924 int err = 0; 1925 struct p9_req_t *req; 1926 struct p9_client *clnt; 1927 1928 clnt = fid->clnt; 1929 1930 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1931 fid->fid, newdirfid->fid, name); 1932 1933 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1934 newdirfid->fid, name); 1935 if (IS_ERR(req)) { 1936 err = PTR_ERR(req); 1937 goto error; 1938 } 1939 1940 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1941 1942 p9_req_put(clnt, req); 1943 error: 1944 return err; 1945 } 1946 EXPORT_SYMBOL(p9_client_rename); 1947 1948 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1949 struct p9_fid *newdirfid, const char *new_name) 1950 { 1951 int err = 0; 1952 struct p9_req_t *req; 1953 struct p9_client *clnt; 1954 1955 clnt = olddirfid->clnt; 1956 1957 p9_debug(P9_DEBUG_9P, 1958 ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n", 1959 olddirfid->fid, old_name, newdirfid->fid, new_name); 1960 1961 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1962 old_name, newdirfid->fid, new_name); 1963 if (IS_ERR(req)) { 1964 err = PTR_ERR(req); 1965 goto error; 1966 } 1967 1968 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1969 newdirfid->fid, new_name); 1970 1971 p9_req_put(clnt, req); 1972 error: 1973 return err; 1974 } 1975 EXPORT_SYMBOL(p9_client_renameat); 1976 1977 /* An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1978 */ 1979 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1980 const char *attr_name, u64 *attr_size) 1981 { 1982 int err; 1983 struct p9_req_t *req; 1984 struct p9_client *clnt; 1985 struct p9_fid *attr_fid; 1986 1987 clnt = file_fid->clnt; 1988 attr_fid = p9_fid_create(clnt); 1989 if (!attr_fid) { 1990 err = -ENOMEM; 1991 goto error; 1992 } 1993 p9_debug(P9_DEBUG_9P, 1994 ">>> TXATTRWALK file_fid %d, attr_fid %d name '%s'\n", 1995 file_fid->fid, attr_fid->fid, attr_name); 1996 1997 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 1998 file_fid->fid, attr_fid->fid, attr_name); 1999 if (IS_ERR(req)) { 2000 err = PTR_ERR(req); 2001 goto error; 2002 } 2003 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); 2004 if (err) { 2005 trace_9p_protocol_dump(clnt, &req->rc); 2006 p9_req_put(clnt, req); 2007 goto clunk_fid; 2008 } 2009 p9_req_put(clnt, req); 2010 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2011 attr_fid->fid, *attr_size); 2012 return attr_fid; 2013 clunk_fid: 2014 p9_fid_put(attr_fid); 2015 attr_fid = NULL; 2016 error: 2017 if (attr_fid && attr_fid != file_fid) 2018 p9_fid_destroy(attr_fid); 2019 2020 return ERR_PTR(err); 2021 } 2022 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2023 2024 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2025 u64 attr_size, int flags) 2026 { 2027 int err = 0; 2028 struct p9_req_t *req; 2029 struct p9_client *clnt; 2030 2031 p9_debug(P9_DEBUG_9P, 2032 ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n", 2033 fid->fid, name, attr_size, flags); 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 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 clnt = fid->clnt; 2121 p9_debug(P9_DEBUG_9P, 2122 ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n", 2123 fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2124 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2125 MAJOR(rdev), MINOR(rdev), gid); 2126 if (IS_ERR(req)) 2127 return PTR_ERR(req); 2128 2129 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2130 if (err) { 2131 trace_9p_protocol_dump(clnt, &req->rc); 2132 goto error; 2133 } 2134 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", 2135 qid->type, qid->path, qid->version); 2136 2137 error: 2138 p9_req_put(clnt, req); 2139 return err; 2140 } 2141 EXPORT_SYMBOL(p9_client_mknod_dotl); 2142 2143 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2144 kgid_t gid, struct p9_qid *qid) 2145 { 2146 int err; 2147 struct p9_client *clnt; 2148 struct p9_req_t *req; 2149 2150 clnt = fid->clnt; 2151 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2152 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2153 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", 2154 fid->fid, name, mode, gid); 2155 if (IS_ERR(req)) 2156 return PTR_ERR(req); 2157 2158 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2159 if (err) { 2160 trace_9p_protocol_dump(clnt, &req->rc); 2161 goto error; 2162 } 2163 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2164 qid->path, qid->version); 2165 2166 error: 2167 p9_req_put(clnt, req); 2168 return err; 2169 } 2170 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2171 2172 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2173 { 2174 int err; 2175 struct p9_client *clnt; 2176 struct p9_req_t *req; 2177 2178 clnt = fid->clnt; 2179 p9_debug(P9_DEBUG_9P, 2180 ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n", 2181 fid->fid, flock->type, flock->flags, flock->start, 2182 flock->length, flock->proc_id, flock->client_id); 2183 2184 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2185 flock->flags, flock->start, flock->length, 2186 flock->proc_id, flock->client_id); 2187 2188 if (IS_ERR(req)) 2189 return PTR_ERR(req); 2190 2191 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); 2192 if (err) { 2193 trace_9p_protocol_dump(clnt, &req->rc); 2194 goto error; 2195 } 2196 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2197 error: 2198 p9_req_put(clnt, req); 2199 return err; 2200 } 2201 EXPORT_SYMBOL(p9_client_lock_dotl); 2202 2203 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2204 { 2205 int err; 2206 struct p9_client *clnt; 2207 struct p9_req_t *req; 2208 2209 clnt = fid->clnt; 2210 p9_debug(P9_DEBUG_9P, 2211 ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n", 2212 fid->fid, glock->type, glock->start, glock->length, 2213 glock->proc_id, glock->client_id); 2214 2215 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, 2216 glock->type, glock->start, glock->length, 2217 glock->proc_id, glock->client_id); 2218 2219 if (IS_ERR(req)) 2220 return PTR_ERR(req); 2221 2222 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, 2223 &glock->start, &glock->length, &glock->proc_id, 2224 &glock->client_id); 2225 if (err) { 2226 trace_9p_protocol_dump(clnt, &req->rc); 2227 goto error; 2228 } 2229 p9_debug(P9_DEBUG_9P, 2230 "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n", 2231 glock->type, glock->start, glock->length, 2232 glock->proc_id, glock->client_id); 2233 error: 2234 p9_req_put(clnt, req); 2235 return err; 2236 } 2237 EXPORT_SYMBOL(p9_client_getlock_dotl); 2238 2239 int p9_client_readlink(struct p9_fid *fid, char **target) 2240 { 2241 int err; 2242 struct p9_client *clnt; 2243 struct p9_req_t *req; 2244 2245 clnt = fid->clnt; 2246 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2247 2248 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2249 if (IS_ERR(req)) 2250 return PTR_ERR(req); 2251 2252 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); 2253 if (err) { 2254 trace_9p_protocol_dump(clnt, &req->rc); 2255 goto error; 2256 } 2257 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2258 error: 2259 p9_req_put(clnt, req); 2260 return err; 2261 } 2262 EXPORT_SYMBOL(p9_client_readlink); 2263 2264 int __init p9_client_init(void) 2265 { 2266 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); 2267 return p9_req_cache ? 0 : -ENOMEM; 2268 } 2269 2270 void __exit p9_client_exit(void) 2271 { 2272 kmem_cache_destroy(p9_req_cache); 2273 } 2274