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; 981 982 clnt = kmalloc(sizeof(*clnt), GFP_KERNEL); 983 if (!clnt) 984 return ERR_PTR(-ENOMEM); 985 986 clnt->trans_mod = NULL; 987 clnt->trans = NULL; 988 clnt->fcall_cache = NULL; 989 990 client_id = utsname()->nodename; 991 memcpy(clnt->name, client_id, strlen(client_id) + 1); 992 993 spin_lock_init(&clnt->lock); 994 idr_init(&clnt->fids); 995 idr_init(&clnt->reqs); 996 997 err = parse_opts(options, clnt); 998 if (err < 0) 999 goto free_client; 1000 1001 if (!clnt->trans_mod) 1002 clnt->trans_mod = v9fs_get_default_trans(); 1003 1004 if (!clnt->trans_mod) { 1005 err = -EPROTONOSUPPORT; 1006 p9_debug(P9_DEBUG_ERROR, 1007 "No transport defined or default transport\n"); 1008 goto free_client; 1009 } 1010 1011 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1012 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1013 1014 err = clnt->trans_mod->create(clnt, dev_name, options); 1015 if (err) 1016 goto put_trans; 1017 1018 if (clnt->msize > clnt->trans_mod->maxsize) { 1019 clnt->msize = clnt->trans_mod->maxsize; 1020 pr_info("Limiting 'msize' to %d as this is the maximum " 1021 "supported by transport %s\n", 1022 clnt->msize, clnt->trans_mod->name 1023 ); 1024 } 1025 1026 if (clnt->msize < 4096) { 1027 p9_debug(P9_DEBUG_ERROR, 1028 "Please specify a msize of at least 4k\n"); 1029 err = -EINVAL; 1030 goto close_trans; 1031 } 1032 1033 err = p9_client_version(clnt); 1034 if (err) 1035 goto close_trans; 1036 1037 /* P9_HDRSZ + 4 is the smallest packet header we can have that is 1038 * followed by data accessed from userspace by read 1039 */ 1040 clnt->fcall_cache = 1041 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, 1042 0, 0, P9_HDRSZ + 4, 1043 clnt->msize - (P9_HDRSZ + 4), 1044 NULL); 1045 1046 return clnt; 1047 1048 close_trans: 1049 clnt->trans_mod->close(clnt); 1050 put_trans: 1051 v9fs_put_trans(clnt->trans_mod); 1052 free_client: 1053 kfree(clnt); 1054 return ERR_PTR(err); 1055 } 1056 EXPORT_SYMBOL(p9_client_create); 1057 1058 void p9_client_destroy(struct p9_client *clnt) 1059 { 1060 struct p9_fid *fid; 1061 int id; 1062 1063 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1064 1065 if (clnt->trans_mod) 1066 clnt->trans_mod->close(clnt); 1067 1068 v9fs_put_trans(clnt->trans_mod); 1069 1070 idr_for_each_entry(&clnt->fids, fid, id) { 1071 pr_info("Found fid %d not clunked\n", fid->fid); 1072 p9_fid_destroy(fid); 1073 } 1074 1075 p9_tag_cleanup(clnt); 1076 1077 kmem_cache_destroy(clnt->fcall_cache); 1078 kfree(clnt); 1079 } 1080 EXPORT_SYMBOL(p9_client_destroy); 1081 1082 void p9_client_disconnect(struct p9_client *clnt) 1083 { 1084 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1085 clnt->status = Disconnected; 1086 } 1087 EXPORT_SYMBOL(p9_client_disconnect); 1088 1089 void p9_client_begin_disconnect(struct p9_client *clnt) 1090 { 1091 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1092 clnt->status = BeginDisconnect; 1093 } 1094 EXPORT_SYMBOL(p9_client_begin_disconnect); 1095 1096 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1097 const char *uname, kuid_t n_uname, 1098 const char *aname) 1099 { 1100 int err; 1101 struct p9_req_t *req; 1102 struct p9_fid *fid; 1103 struct p9_qid qid; 1104 1105 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1106 afid ? afid->fid : -1, uname, aname); 1107 fid = p9_fid_create(clnt); 1108 if (!fid) { 1109 err = -ENOMEM; 1110 goto error; 1111 } 1112 fid->uid = n_uname; 1113 1114 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1115 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1116 if (IS_ERR(req)) { 1117 err = PTR_ERR(req); 1118 goto error; 1119 } 1120 1121 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); 1122 if (err) { 1123 trace_9p_protocol_dump(clnt, &req->rc); 1124 p9_req_put(clnt, req); 1125 goto error; 1126 } 1127 1128 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1129 qid.type, qid.path, qid.version); 1130 1131 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1132 1133 p9_req_put(clnt, req); 1134 return fid; 1135 1136 error: 1137 if (fid) 1138 p9_fid_destroy(fid); 1139 return ERR_PTR(err); 1140 } 1141 EXPORT_SYMBOL(p9_client_attach); 1142 1143 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1144 const unsigned char * const *wnames, int clone) 1145 { 1146 int err; 1147 struct p9_client *clnt; 1148 struct p9_fid *fid; 1149 struct p9_qid *wqids; 1150 struct p9_req_t *req; 1151 u16 nwqids, count; 1152 1153 wqids = NULL; 1154 clnt = oldfid->clnt; 1155 if (clone) { 1156 fid = p9_fid_create(clnt); 1157 if (!fid) { 1158 err = -ENOMEM; 1159 goto error; 1160 } 1161 1162 fid->uid = oldfid->uid; 1163 } else { 1164 fid = oldfid; 1165 } 1166 1167 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1168 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1169 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1170 nwname, wnames); 1171 if (IS_ERR(req)) { 1172 err = PTR_ERR(req); 1173 goto error; 1174 } 1175 1176 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1177 if (err) { 1178 trace_9p_protocol_dump(clnt, &req->rc); 1179 p9_req_put(clnt, req); 1180 goto clunk_fid; 1181 } 1182 p9_req_put(clnt, req); 1183 1184 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1185 1186 if (nwqids != nwname) { 1187 err = -ENOENT; 1188 goto clunk_fid; 1189 } 1190 1191 for (count = 0; count < nwqids; count++) 1192 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1193 count, wqids[count].type, 1194 wqids[count].path, 1195 wqids[count].version); 1196 1197 if (nwname) 1198 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1199 else 1200 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); 1201 1202 kfree(wqids); 1203 return fid; 1204 1205 clunk_fid: 1206 kfree(wqids); 1207 p9_fid_put(fid); 1208 fid = NULL; 1209 1210 error: 1211 if (fid && fid != oldfid) 1212 p9_fid_destroy(fid); 1213 1214 return ERR_PTR(err); 1215 } 1216 EXPORT_SYMBOL(p9_client_walk); 1217 1218 int p9_client_open(struct p9_fid *fid, int mode) 1219 { 1220 int err; 1221 struct p9_client *clnt; 1222 struct p9_req_t *req; 1223 struct p9_qid qid; 1224 int iounit; 1225 1226 clnt = fid->clnt; 1227 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1228 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1229 1230 if (fid->mode != -1) 1231 return -EINVAL; 1232 1233 if (p9_is_proto_dotl(clnt)) 1234 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode & P9L_MODE_MASK); 1235 else 1236 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode & P9L_MODE_MASK); 1237 if (IS_ERR(req)) { 1238 err = PTR_ERR(req); 1239 goto error; 1240 } 1241 1242 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1243 if (err) { 1244 trace_9p_protocol_dump(clnt, &req->rc); 1245 goto free_and_error; 1246 } 1247 1248 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1249 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1250 qid.path, qid.version, iounit); 1251 1252 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1253 fid->mode = mode; 1254 fid->iounit = iounit; 1255 1256 free_and_error: 1257 p9_req_put(clnt, req); 1258 error: 1259 return err; 1260 } 1261 EXPORT_SYMBOL(p9_client_open); 1262 1263 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, 1264 u32 mode, kgid_t gid, struct p9_qid *qid) 1265 { 1266 int err; 1267 struct p9_client *clnt; 1268 struct p9_req_t *req; 1269 int iounit; 1270 1271 p9_debug(P9_DEBUG_9P, 1272 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1273 ofid->fid, name, flags, mode, 1274 from_kgid(&init_user_ns, gid)); 1275 clnt = ofid->clnt; 1276 1277 if (ofid->mode != -1) 1278 return -EINVAL; 1279 1280 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1281 mode & P9L_MODE_MASK, gid); 1282 if (IS_ERR(req)) { 1283 err = PTR_ERR(req); 1284 goto error; 1285 } 1286 1287 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); 1288 if (err) { 1289 trace_9p_protocol_dump(clnt, &req->rc); 1290 goto free_and_error; 1291 } 1292 1293 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1294 qid->type, qid->path, qid->version, iounit); 1295 1296 memmove(&ofid->qid, qid, sizeof(struct p9_qid)); 1297 ofid->mode = flags; 1298 ofid->iounit = iounit; 1299 1300 free_and_error: 1301 p9_req_put(clnt, req); 1302 error: 1303 return err; 1304 } 1305 EXPORT_SYMBOL(p9_client_create_dotl); 1306 1307 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1308 char *extension) 1309 { 1310 int err; 1311 struct p9_client *clnt; 1312 struct p9_req_t *req; 1313 struct p9_qid qid; 1314 int iounit; 1315 1316 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1317 fid->fid, name, perm, mode); 1318 clnt = fid->clnt; 1319 1320 if (fid->mode != -1) 1321 return -EINVAL; 1322 1323 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1324 mode & P9L_MODE_MASK, extension); 1325 if (IS_ERR(req)) { 1326 err = PTR_ERR(req); 1327 goto error; 1328 } 1329 1330 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1331 if (err) { 1332 trace_9p_protocol_dump(clnt, &req->rc); 1333 goto free_and_error; 1334 } 1335 1336 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1337 qid.type, qid.path, qid.version, iounit); 1338 1339 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1340 fid->mode = mode; 1341 fid->iounit = iounit; 1342 1343 free_and_error: 1344 p9_req_put(clnt, req); 1345 error: 1346 return err; 1347 } 1348 EXPORT_SYMBOL(p9_client_fcreate); 1349 1350 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1351 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1352 { 1353 int err; 1354 struct p9_client *clnt; 1355 struct p9_req_t *req; 1356 1357 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1358 dfid->fid, name, symtgt); 1359 clnt = dfid->clnt; 1360 1361 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1362 gid); 1363 if (IS_ERR(req)) { 1364 err = PTR_ERR(req); 1365 goto error; 1366 } 1367 1368 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 1369 if (err) { 1370 trace_9p_protocol_dump(clnt, &req->rc); 1371 goto free_and_error; 1372 } 1373 1374 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1375 qid->type, qid->path, qid->version); 1376 1377 free_and_error: 1378 p9_req_put(clnt, req); 1379 error: 1380 return err; 1381 } 1382 EXPORT_SYMBOL(p9_client_symlink); 1383 1384 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1385 { 1386 struct p9_client *clnt; 1387 struct p9_req_t *req; 1388 1389 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1390 dfid->fid, oldfid->fid, newname); 1391 clnt = dfid->clnt; 1392 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1393 newname); 1394 if (IS_ERR(req)) 1395 return PTR_ERR(req); 1396 1397 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1398 p9_req_put(clnt, req); 1399 return 0; 1400 } 1401 EXPORT_SYMBOL(p9_client_link); 1402 1403 int p9_client_fsync(struct p9_fid *fid, int datasync) 1404 { 1405 int err = 0; 1406 struct p9_client *clnt; 1407 struct p9_req_t *req; 1408 1409 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1410 fid->fid, datasync); 1411 clnt = fid->clnt; 1412 1413 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1414 if (IS_ERR(req)) { 1415 err = PTR_ERR(req); 1416 goto error; 1417 } 1418 1419 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1420 1421 p9_req_put(clnt, req); 1422 1423 error: 1424 return err; 1425 } 1426 EXPORT_SYMBOL(p9_client_fsync); 1427 1428 int p9_client_clunk(struct p9_fid *fid) 1429 { 1430 int err = 0; 1431 struct p9_client *clnt; 1432 struct p9_req_t *req; 1433 int retries = 0; 1434 1435 again: 1436 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", 1437 fid->fid, retries); 1438 clnt = fid->clnt; 1439 1440 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1441 if (IS_ERR(req)) { 1442 err = PTR_ERR(req); 1443 goto error; 1444 } 1445 1446 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1447 1448 p9_req_put(clnt, req); 1449 error: 1450 /* Fid is not valid even after a failed clunk 1451 * If interrupted, retry once then give up and 1452 * leak fid until umount. 1453 */ 1454 if (err == -ERESTARTSYS) { 1455 if (retries++ == 0) 1456 goto again; 1457 } else { 1458 p9_fid_destroy(fid); 1459 } 1460 return err; 1461 } 1462 EXPORT_SYMBOL(p9_client_clunk); 1463 1464 int p9_client_remove(struct p9_fid *fid) 1465 { 1466 int err = 0; 1467 struct p9_client *clnt; 1468 struct p9_req_t *req; 1469 1470 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1471 clnt = fid->clnt; 1472 1473 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1474 if (IS_ERR(req)) { 1475 err = PTR_ERR(req); 1476 goto error; 1477 } 1478 1479 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1480 1481 p9_req_put(clnt, req); 1482 error: 1483 if (err == -ERESTARTSYS) 1484 p9_fid_put(fid); 1485 else 1486 p9_fid_destroy(fid); 1487 return err; 1488 } 1489 EXPORT_SYMBOL(p9_client_remove); 1490 1491 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1492 { 1493 int err = 0; 1494 struct p9_req_t *req; 1495 struct p9_client *clnt; 1496 1497 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1498 dfid->fid, name, flags); 1499 1500 clnt = dfid->clnt; 1501 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1502 if (IS_ERR(req)) { 1503 err = PTR_ERR(req); 1504 goto error; 1505 } 1506 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1507 1508 p9_req_put(clnt, req); 1509 error: 1510 return err; 1511 } 1512 EXPORT_SYMBOL(p9_client_unlinkat); 1513 1514 int 1515 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1516 { 1517 int total = 0; 1518 *err = 0; 1519 1520 while (iov_iter_count(to)) { 1521 int count; 1522 1523 count = p9_client_read_once(fid, offset, to, err); 1524 if (!count || *err) 1525 break; 1526 offset += count; 1527 total += count; 1528 } 1529 return total; 1530 } 1531 EXPORT_SYMBOL(p9_client_read); 1532 1533 int 1534 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, 1535 int *err) 1536 { 1537 struct p9_client *clnt = fid->clnt; 1538 struct p9_req_t *req; 1539 int count = iov_iter_count(to); 1540 int rsize, received, non_zc = 0; 1541 char *dataptr; 1542 1543 *err = 0; 1544 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n", 1545 fid->fid, offset, iov_iter_count(to)); 1546 1547 rsize = fid->iounit; 1548 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1549 rsize = clnt->msize - P9_IOHDRSZ; 1550 1551 if (count < rsize) 1552 rsize = count; 1553 1554 /* Don't bother zerocopy for small IO (< 1024) */ 1555 if (clnt->trans_mod->zc_request && rsize > 1024) { 1556 /* response header len is 11 1557 * PDU Header(7) + IO Size (4) 1558 */ 1559 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1560 0, 11, "dqd", fid->fid, 1561 offset, rsize); 1562 } else { 1563 non_zc = 1; 1564 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1565 rsize); 1566 } 1567 if (IS_ERR(req)) { 1568 *err = PTR_ERR(req); 1569 if (!non_zc) 1570 iov_iter_revert(to, count - iov_iter_count(to)); 1571 return 0; 1572 } 1573 1574 *err = p9pdu_readf(&req->rc, clnt->proto_version, 1575 "D", &received, &dataptr); 1576 if (*err) { 1577 if (!non_zc) 1578 iov_iter_revert(to, count - iov_iter_count(to)); 1579 trace_9p_protocol_dump(clnt, &req->rc); 1580 p9_req_put(clnt, req); 1581 return 0; 1582 } 1583 if (rsize < received) { 1584 pr_err("bogus RREAD count (%d > %d)\n", received, rsize); 1585 received = rsize; 1586 } 1587 1588 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", received); 1589 1590 if (non_zc) { 1591 int n = copy_to_iter(dataptr, received, to); 1592 1593 if (n != received) { 1594 *err = -EFAULT; 1595 p9_req_put(clnt, req); 1596 return n; 1597 } 1598 } else { 1599 iov_iter_revert(to, count - received - iov_iter_count(to)); 1600 } 1601 p9_req_put(clnt, req); 1602 return received; 1603 } 1604 EXPORT_SYMBOL(p9_client_read_once); 1605 1606 int 1607 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1608 { 1609 struct p9_client *clnt = fid->clnt; 1610 struct p9_req_t *req; 1611 int total = 0; 1612 *err = 0; 1613 1614 while (iov_iter_count(from)) { 1615 int count = iov_iter_count(from); 1616 int rsize = fid->iounit; 1617 int written; 1618 1619 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1620 rsize = clnt->msize - P9_IOHDRSZ; 1621 1622 if (count < rsize) 1623 rsize = count; 1624 1625 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d (/%d)\n", 1626 fid->fid, offset, rsize, count); 1627 1628 /* Don't bother zerocopy for small IO (< 1024) */ 1629 if (clnt->trans_mod->zc_request && rsize > 1024) { 1630 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1631 rsize, P9_ZC_HDR_SZ, "dqd", 1632 fid->fid, offset, rsize); 1633 } else { 1634 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1635 offset, rsize, from); 1636 } 1637 if (IS_ERR(req)) { 1638 iov_iter_revert(from, count - iov_iter_count(from)); 1639 *err = PTR_ERR(req); 1640 break; 1641 } 1642 1643 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written); 1644 if (*err) { 1645 iov_iter_revert(from, count - iov_iter_count(from)); 1646 trace_9p_protocol_dump(clnt, &req->rc); 1647 p9_req_put(clnt, req); 1648 break; 1649 } 1650 if (rsize < written) { 1651 pr_err("bogus RWRITE count (%d > %d)\n", written, rsize); 1652 written = rsize; 1653 } 1654 1655 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", written); 1656 1657 p9_req_put(clnt, req); 1658 iov_iter_revert(from, count - written - iov_iter_count(from)); 1659 total += written; 1660 offset += written; 1661 } 1662 return total; 1663 } 1664 EXPORT_SYMBOL(p9_client_write); 1665 1666 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1667 { 1668 int err; 1669 struct p9_client *clnt; 1670 struct p9_wstat *ret; 1671 struct p9_req_t *req; 1672 u16 ignored; 1673 1674 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1675 1676 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1677 if (!ret) 1678 return ERR_PTR(-ENOMEM); 1679 1680 clnt = fid->clnt; 1681 1682 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1683 if (IS_ERR(req)) { 1684 err = PTR_ERR(req); 1685 goto error; 1686 } 1687 1688 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); 1689 if (err) { 1690 trace_9p_protocol_dump(clnt, &req->rc); 1691 p9_req_put(clnt, req); 1692 goto error; 1693 } 1694 1695 p9_debug(P9_DEBUG_9P, 1696 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1697 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1698 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1699 "<<< uid=%d gid=%d n_muid=%d\n", 1700 ret->size, ret->type, ret->dev, ret->qid.type, ret->qid.path, 1701 ret->qid.version, ret->mode, 1702 ret->atime, ret->mtime, ret->length, 1703 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1704 from_kuid(&init_user_ns, ret->n_uid), 1705 from_kgid(&init_user_ns, ret->n_gid), 1706 from_kuid(&init_user_ns, ret->n_muid)); 1707 1708 p9_req_put(clnt, req); 1709 return ret; 1710 1711 error: 1712 kfree(ret); 1713 return ERR_PTR(err); 1714 } 1715 EXPORT_SYMBOL(p9_client_stat); 1716 1717 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1718 u64 request_mask) 1719 { 1720 int err; 1721 struct p9_client *clnt; 1722 struct p9_stat_dotl *ret; 1723 struct p9_req_t *req; 1724 1725 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1726 fid->fid, request_mask); 1727 1728 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1729 if (!ret) 1730 return ERR_PTR(-ENOMEM); 1731 1732 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 = 0; 1811 struct p9_req_t *req; 1812 struct p9_client *clnt; 1813 1814 clnt = fid->clnt; 1815 wst->size = p9_client_statsize(wst, clnt->proto_version); 1816 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", 1817 fid->fid); 1818 p9_debug(P9_DEBUG_9P, 1819 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1820 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1821 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1822 " uid=%d gid=%d n_muid=%d\n", 1823 wst->size, wst->type, wst->dev, wst->qid.type, 1824 wst->qid.path, wst->qid.version, 1825 wst->mode, wst->atime, wst->mtime, wst->length, 1826 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1827 from_kuid(&init_user_ns, wst->n_uid), 1828 from_kgid(&init_user_ns, wst->n_gid), 1829 from_kuid(&init_user_ns, wst->n_muid)); 1830 1831 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", 1832 fid->fid, wst->size + 2, wst); 1833 if (IS_ERR(req)) { 1834 err = PTR_ERR(req); 1835 goto error; 1836 } 1837 1838 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1839 1840 p9_req_put(clnt, req); 1841 error: 1842 return err; 1843 } 1844 EXPORT_SYMBOL(p9_client_wstat); 1845 1846 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1847 { 1848 int err = 0; 1849 struct p9_req_t *req; 1850 struct p9_client *clnt; 1851 1852 clnt = fid->clnt; 1853 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1854 p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n", 1855 p9attr->valid, p9attr->mode, 1856 from_kuid(&init_user_ns, p9attr->uid), 1857 from_kgid(&init_user_ns, p9attr->gid), 1858 p9attr->size); 1859 p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n", 1860 p9attr->atime_sec, p9attr->atime_nsec); 1861 p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n", 1862 p9attr->mtime_sec, p9attr->mtime_nsec); 1863 1864 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1865 1866 if (IS_ERR(req)) { 1867 err = PTR_ERR(req); 1868 goto error; 1869 } 1870 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1871 p9_req_put(clnt, req); 1872 error: 1873 return err; 1874 } 1875 EXPORT_SYMBOL(p9_client_setattr); 1876 1877 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1878 { 1879 int err; 1880 struct p9_req_t *req; 1881 struct p9_client *clnt; 1882 1883 clnt = fid->clnt; 1884 1885 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1886 1887 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1888 if (IS_ERR(req)) { 1889 err = PTR_ERR(req); 1890 goto error; 1891 } 1892 1893 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1894 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1895 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1896 if (err) { 1897 trace_9p_protocol_dump(clnt, &req->rc); 1898 p9_req_put(clnt, req); 1899 goto error; 1900 } 1901 1902 p9_debug(P9_DEBUG_9P, 1903 "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n", 1904 fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree, 1905 sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen); 1906 1907 p9_req_put(clnt, req); 1908 error: 1909 return err; 1910 } 1911 EXPORT_SYMBOL(p9_client_statfs); 1912 1913 int p9_client_rename(struct p9_fid *fid, 1914 struct p9_fid *newdirfid, const char *name) 1915 { 1916 int err = 0; 1917 struct p9_req_t *req; 1918 struct p9_client *clnt; 1919 1920 clnt = fid->clnt; 1921 1922 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1923 fid->fid, newdirfid->fid, name); 1924 1925 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1926 newdirfid->fid, name); 1927 if (IS_ERR(req)) { 1928 err = PTR_ERR(req); 1929 goto error; 1930 } 1931 1932 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1933 1934 p9_req_put(clnt, req); 1935 error: 1936 return err; 1937 } 1938 EXPORT_SYMBOL(p9_client_rename); 1939 1940 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1941 struct p9_fid *newdirfid, const char *new_name) 1942 { 1943 int err = 0; 1944 struct p9_req_t *req; 1945 struct p9_client *clnt; 1946 1947 clnt = olddirfid->clnt; 1948 1949 p9_debug(P9_DEBUG_9P, 1950 ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n", 1951 olddirfid->fid, old_name, newdirfid->fid, new_name); 1952 1953 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1954 old_name, newdirfid->fid, new_name); 1955 if (IS_ERR(req)) { 1956 err = PTR_ERR(req); 1957 goto error; 1958 } 1959 1960 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1961 newdirfid->fid, new_name); 1962 1963 p9_req_put(clnt, req); 1964 error: 1965 return err; 1966 } 1967 EXPORT_SYMBOL(p9_client_renameat); 1968 1969 /* An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1970 */ 1971 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1972 const char *attr_name, u64 *attr_size) 1973 { 1974 int err; 1975 struct p9_req_t *req; 1976 struct p9_client *clnt; 1977 struct p9_fid *attr_fid; 1978 1979 clnt = file_fid->clnt; 1980 attr_fid = p9_fid_create(clnt); 1981 if (!attr_fid) { 1982 err = -ENOMEM; 1983 goto error; 1984 } 1985 p9_debug(P9_DEBUG_9P, 1986 ">>> TXATTRWALK file_fid %d, attr_fid %d name '%s'\n", 1987 file_fid->fid, attr_fid->fid, attr_name); 1988 1989 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 1990 file_fid->fid, attr_fid->fid, attr_name); 1991 if (IS_ERR(req)) { 1992 err = PTR_ERR(req); 1993 goto error; 1994 } 1995 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); 1996 if (err) { 1997 trace_9p_protocol_dump(clnt, &req->rc); 1998 p9_req_put(clnt, req); 1999 goto clunk_fid; 2000 } 2001 p9_req_put(clnt, req); 2002 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2003 attr_fid->fid, *attr_size); 2004 return attr_fid; 2005 clunk_fid: 2006 p9_fid_put(attr_fid); 2007 attr_fid = NULL; 2008 error: 2009 if (attr_fid && attr_fid != file_fid) 2010 p9_fid_destroy(attr_fid); 2011 2012 return ERR_PTR(err); 2013 } 2014 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2015 2016 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2017 u64 attr_size, int flags) 2018 { 2019 int err = 0; 2020 struct p9_req_t *req; 2021 struct p9_client *clnt; 2022 2023 p9_debug(P9_DEBUG_9P, 2024 ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n", 2025 fid->fid, name, attr_size, flags); 2026 clnt = fid->clnt; 2027 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2028 fid->fid, name, attr_size, flags); 2029 if (IS_ERR(req)) { 2030 err = PTR_ERR(req); 2031 goto error; 2032 } 2033 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2034 p9_req_put(clnt, req); 2035 error: 2036 return err; 2037 } 2038 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2039 2040 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2041 { 2042 int err, rsize, non_zc = 0; 2043 struct p9_client *clnt; 2044 struct p9_req_t *req; 2045 char *dataptr; 2046 struct kvec kv = {.iov_base = data, .iov_len = count}; 2047 struct iov_iter to; 2048 2049 iov_iter_kvec(&to, ITER_DEST, &kv, 1, count); 2050 2051 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2052 fid->fid, offset, count); 2053 2054 clnt = fid->clnt; 2055 2056 rsize = fid->iounit; 2057 if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ) 2058 rsize = clnt->msize - P9_READDIRHDRSZ; 2059 2060 if (count < rsize) 2061 rsize = count; 2062 2063 /* Don't bother zerocopy for small IO (< 1024) */ 2064 if (clnt->trans_mod->zc_request && rsize > 1024) { 2065 /* response header len is 11 2066 * PDU Header(7) + IO Size (4) 2067 */ 2068 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2069 11, "dqd", fid->fid, offset, rsize); 2070 } else { 2071 non_zc = 1; 2072 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2073 offset, rsize); 2074 } 2075 if (IS_ERR(req)) { 2076 err = PTR_ERR(req); 2077 goto error; 2078 } 2079 2080 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); 2081 if (err) { 2082 trace_9p_protocol_dump(clnt, &req->rc); 2083 goto free_and_error; 2084 } 2085 if (rsize < count) { 2086 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2087 count = rsize; 2088 } 2089 2090 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2091 2092 if (non_zc) 2093 memmove(data, dataptr, count); 2094 2095 p9_req_put(clnt, req); 2096 return count; 2097 2098 free_and_error: 2099 p9_req_put(clnt, req); 2100 error: 2101 return err; 2102 } 2103 EXPORT_SYMBOL(p9_client_readdir); 2104 2105 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2106 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2107 { 2108 int err; 2109 struct p9_client *clnt; 2110 struct p9_req_t *req; 2111 2112 clnt = fid->clnt; 2113 p9_debug(P9_DEBUG_9P, 2114 ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n", 2115 fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2116 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2117 MAJOR(rdev), MINOR(rdev), gid); 2118 if (IS_ERR(req)) 2119 return PTR_ERR(req); 2120 2121 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2122 if (err) { 2123 trace_9p_protocol_dump(clnt, &req->rc); 2124 goto error; 2125 } 2126 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", 2127 qid->type, qid->path, qid->version); 2128 2129 error: 2130 p9_req_put(clnt, req); 2131 return err; 2132 } 2133 EXPORT_SYMBOL(p9_client_mknod_dotl); 2134 2135 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2136 kgid_t gid, struct p9_qid *qid) 2137 { 2138 int err; 2139 struct p9_client *clnt; 2140 struct p9_req_t *req; 2141 2142 clnt = fid->clnt; 2143 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2144 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2145 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", 2146 fid->fid, name, mode, gid); 2147 if (IS_ERR(req)) 2148 return PTR_ERR(req); 2149 2150 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2151 if (err) { 2152 trace_9p_protocol_dump(clnt, &req->rc); 2153 goto error; 2154 } 2155 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2156 qid->path, qid->version); 2157 2158 error: 2159 p9_req_put(clnt, req); 2160 return err; 2161 } 2162 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2163 2164 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2165 { 2166 int err; 2167 struct p9_client *clnt; 2168 struct p9_req_t *req; 2169 2170 clnt = fid->clnt; 2171 p9_debug(P9_DEBUG_9P, 2172 ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n", 2173 fid->fid, flock->type, flock->flags, flock->start, 2174 flock->length, flock->proc_id, flock->client_id); 2175 2176 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2177 flock->flags, flock->start, flock->length, 2178 flock->proc_id, flock->client_id); 2179 2180 if (IS_ERR(req)) 2181 return PTR_ERR(req); 2182 2183 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); 2184 if (err) { 2185 trace_9p_protocol_dump(clnt, &req->rc); 2186 goto error; 2187 } 2188 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2189 error: 2190 p9_req_put(clnt, req); 2191 return err; 2192 } 2193 EXPORT_SYMBOL(p9_client_lock_dotl); 2194 2195 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2196 { 2197 int err; 2198 struct p9_client *clnt; 2199 struct p9_req_t *req; 2200 2201 clnt = fid->clnt; 2202 p9_debug(P9_DEBUG_9P, 2203 ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n", 2204 fid->fid, glock->type, glock->start, glock->length, 2205 glock->proc_id, glock->client_id); 2206 2207 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, 2208 glock->type, glock->start, glock->length, 2209 glock->proc_id, glock->client_id); 2210 2211 if (IS_ERR(req)) 2212 return PTR_ERR(req); 2213 2214 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, 2215 &glock->start, &glock->length, &glock->proc_id, 2216 &glock->client_id); 2217 if (err) { 2218 trace_9p_protocol_dump(clnt, &req->rc); 2219 goto error; 2220 } 2221 p9_debug(P9_DEBUG_9P, 2222 "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n", 2223 glock->type, glock->start, glock->length, 2224 glock->proc_id, glock->client_id); 2225 error: 2226 p9_req_put(clnt, req); 2227 return err; 2228 } 2229 EXPORT_SYMBOL(p9_client_getlock_dotl); 2230 2231 int p9_client_readlink(struct p9_fid *fid, char **target) 2232 { 2233 int err; 2234 struct p9_client *clnt; 2235 struct p9_req_t *req; 2236 2237 clnt = fid->clnt; 2238 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2239 2240 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2241 if (IS_ERR(req)) 2242 return PTR_ERR(req); 2243 2244 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); 2245 if (err) { 2246 trace_9p_protocol_dump(clnt, &req->rc); 2247 goto error; 2248 } 2249 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2250 error: 2251 p9_req_put(clnt, req); 2252 return err; 2253 } 2254 EXPORT_SYMBOL(p9_client_readlink); 2255 2256 int __init p9_client_init(void) 2257 { 2258 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); 2259 return p9_req_cache ? 0 : -ENOMEM; 2260 } 2261 2262 void __exit p9_client_exit(void) 2263 { 2264 kmem_cache_destroy(p9_req_cache); 2265 } 2266