1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * 9P Client 4 * 5 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> 6 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net> 7 */ 8 9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 10 11 #include <linux/module.h> 12 #include <linux/errno.h> 13 #include <linux/fs.h> 14 #include <linux/poll.h> 15 #include <linux/idr.h> 16 #include <linux/mutex.h> 17 #include <linux/slab.h> 18 #include <linux/sched/signal.h> 19 #include <linux/uaccess.h> 20 #include <linux/uio.h> 21 #include <net/9p/9p.h> 22 #include <linux/parser.h> 23 #include <linux/seq_file.h> 24 #include <net/9p/client.h> 25 #include <net/9p/transport.h> 26 #include "protocol.h" 27 28 #define CREATE_TRACE_POINTS 29 #include <trace/events/9p.h> 30 31 /* DEFAULT MSIZE = 32 pages worth of payload + P9_HDRSZ + 32 * room for write (16 extra) or read (11 extra) operands. 33 */ 34 35 #define DEFAULT_MSIZE ((128 * 1024) + P9_IOHDRSZ) 36 37 /* Client Option Parsing (code inspired by NFS code) 38 * - a little lazy - parse all client options 39 */ 40 41 enum { 42 Opt_msize, 43 Opt_trans, 44 Opt_legacy, 45 Opt_version, 46 Opt_err, 47 }; 48 49 static const match_table_t tokens = { 50 {Opt_msize, "msize=%u"}, 51 {Opt_legacy, "noextend"}, 52 {Opt_trans, "trans=%s"}, 53 {Opt_version, "version=%s"}, 54 {Opt_err, NULL}, 55 }; 56 57 inline int p9_is_proto_dotl(struct p9_client *clnt) 58 { 59 return clnt->proto_version == p9_proto_2000L; 60 } 61 EXPORT_SYMBOL(p9_is_proto_dotl); 62 63 inline int p9_is_proto_dotu(struct p9_client *clnt) 64 { 65 return clnt->proto_version == p9_proto_2000u; 66 } 67 EXPORT_SYMBOL(p9_is_proto_dotu); 68 69 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt) 70 { 71 if (clnt->msize != DEFAULT_MSIZE) 72 seq_printf(m, ",msize=%u", clnt->msize); 73 seq_printf(m, ",trans=%s", clnt->trans_mod->name); 74 75 switch (clnt->proto_version) { 76 case p9_proto_legacy: 77 seq_puts(m, ",noextend"); 78 break; 79 case p9_proto_2000u: 80 seq_puts(m, ",version=9p2000.u"); 81 break; 82 case p9_proto_2000L: 83 /* Default */ 84 break; 85 } 86 87 if (clnt->trans_mod->show_options) 88 return clnt->trans_mod->show_options(m, clnt); 89 return 0; 90 } 91 EXPORT_SYMBOL(p9_show_client_options); 92 93 /* Some error codes are taken directly from the server replies, 94 * make sure they are valid. 95 */ 96 static int safe_errno(int err) 97 { 98 if (err > 0 || err < -MAX_ERRNO) { 99 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err); 100 return -EPROTO; 101 } 102 return err; 103 } 104 105 /* Interpret mount option for protocol version */ 106 static int get_protocol_version(char *s) 107 { 108 int version = -EINVAL; 109 110 if (!strcmp(s, "9p2000")) { 111 version = p9_proto_legacy; 112 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n"); 113 } else if (!strcmp(s, "9p2000.u")) { 114 version = p9_proto_2000u; 115 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); 116 } else if (!strcmp(s, "9p2000.L")) { 117 version = p9_proto_2000L; 118 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); 119 } else { 120 pr_info("Unknown protocol version %s\n", s); 121 } 122 123 return version; 124 } 125 126 /** 127 * parse_opts - parse mount options into client structure 128 * @opts: options string passed from mount 129 * @clnt: existing v9fs client information 130 * 131 * Return 0 upon success, -ERRNO upon failure 132 */ 133 134 static int parse_opts(char *opts, struct p9_client *clnt) 135 { 136 char *options, *tmp_options; 137 char *p; 138 substring_t args[MAX_OPT_ARGS]; 139 int option; 140 char *s; 141 int ret = 0; 142 143 clnt->proto_version = p9_proto_2000L; 144 clnt->msize = DEFAULT_MSIZE; 145 146 if (!opts) 147 return 0; 148 149 tmp_options = kstrdup(opts, GFP_KERNEL); 150 if (!tmp_options) 151 return -ENOMEM; 152 options = tmp_options; 153 154 while ((p = strsep(&options, ",")) != NULL) { 155 int token, r; 156 157 if (!*p) 158 continue; 159 token = match_token(p, tokens, args); 160 switch (token) { 161 case Opt_msize: 162 r = match_int(&args[0], &option); 163 if (r < 0) { 164 p9_debug(P9_DEBUG_ERROR, 165 "integer field, but no integer?\n"); 166 ret = r; 167 continue; 168 } 169 if (option < 4096) { 170 p9_debug(P9_DEBUG_ERROR, 171 "msize should be at least 4k\n"); 172 ret = -EINVAL; 173 continue; 174 } 175 clnt->msize = option; 176 break; 177 case Opt_trans: 178 s = match_strdup(&args[0]); 179 if (!s) { 180 ret = -ENOMEM; 181 p9_debug(P9_DEBUG_ERROR, 182 "problem allocating copy of trans arg\n"); 183 goto free_and_return; 184 } 185 186 v9fs_put_trans(clnt->trans_mod); 187 clnt->trans_mod = v9fs_get_trans_by_name(s); 188 if (!clnt->trans_mod) { 189 pr_info("Could not find request transport: %s\n", 190 s); 191 ret = -EINVAL; 192 } 193 kfree(s); 194 break; 195 case Opt_legacy: 196 clnt->proto_version = p9_proto_legacy; 197 break; 198 case Opt_version: 199 s = match_strdup(&args[0]); 200 if (!s) { 201 ret = -ENOMEM; 202 p9_debug(P9_DEBUG_ERROR, 203 "problem allocating copy of version arg\n"); 204 goto free_and_return; 205 } 206 r = get_protocol_version(s); 207 if (r < 0) 208 ret = r; 209 else 210 clnt->proto_version = r; 211 kfree(s); 212 break; 213 default: 214 continue; 215 } 216 } 217 218 free_and_return: 219 if (ret) 220 v9fs_put_trans(clnt->trans_mod); 221 kfree(tmp_options); 222 return ret; 223 } 224 225 static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc, 226 int alloc_msize) 227 { 228 if (likely(c->fcall_cache) && alloc_msize == c->msize) { 229 fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS); 230 fc->cache = c->fcall_cache; 231 } else { 232 fc->sdata = kmalloc(alloc_msize, GFP_NOFS); 233 fc->cache = NULL; 234 } 235 if (!fc->sdata) 236 return -ENOMEM; 237 fc->capacity = alloc_msize; 238 return 0; 239 } 240 241 void p9_fcall_fini(struct p9_fcall *fc) 242 { 243 /* sdata can be NULL for interrupted requests in trans_rdma, 244 * and kmem_cache_free does not do NULL-check for us 245 */ 246 if (unlikely(!fc->sdata)) 247 return; 248 249 if (fc->cache) 250 kmem_cache_free(fc->cache, fc->sdata); 251 else 252 kfree(fc->sdata); 253 } 254 EXPORT_SYMBOL(p9_fcall_fini); 255 256 static struct kmem_cache *p9_req_cache; 257 258 /** 259 * p9_tag_alloc - Allocate a new request. 260 * @c: Client session. 261 * @type: Transaction type. 262 * @t_size: Buffer size for holding this request 263 * (automatic calculation by format template if 0). 264 * @r_size: Buffer size for holding server's reply on this request 265 * (automatic calculation by format template if 0). 266 * @fmt: Format template for assembling 9p request message 267 * (see p9pdu_vwritef). 268 * @ap: Variable arguments to be fed to passed format template 269 * (see p9pdu_vwritef). 270 * 271 * Context: Process context. 272 * Return: Pointer to new request. 273 */ 274 static struct p9_req_t * 275 p9_tag_alloc(struct p9_client *c, int8_t type, uint t_size, uint r_size, 276 const char *fmt, va_list ap) 277 { 278 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); 279 int alloc_tsize; 280 int alloc_rsize; 281 int tag; 282 va_list apc; 283 284 va_copy(apc, ap); 285 alloc_tsize = min_t(size_t, c->msize, 286 t_size ?: p9_msg_buf_size(c, type, fmt, apc)); 287 va_end(apc); 288 289 alloc_rsize = min_t(size_t, c->msize, 290 r_size ?: p9_msg_buf_size(c, type + 1, fmt, ap)); 291 292 if (!req) 293 return ERR_PTR(-ENOMEM); 294 295 if (p9_fcall_init(c, &req->tc, alloc_tsize)) 296 goto free_req; 297 if (p9_fcall_init(c, &req->rc, alloc_rsize)) 298 goto free; 299 300 p9pdu_reset(&req->tc); 301 p9pdu_reset(&req->rc); 302 req->t_err = 0; 303 req->status = REQ_STATUS_ALLOC; 304 /* refcount needs to be set to 0 before inserting into the idr 305 * so p9_tag_lookup does not accept a request that is not fully 306 * initialized. refcount_set to 2 below will mark request ready. 307 */ 308 refcount_set(&req->refcount, 0); 309 init_waitqueue_head(&req->wq); 310 INIT_LIST_HEAD(&req->req_list); 311 312 idr_preload(GFP_NOFS); 313 spin_lock_irq(&c->lock); 314 if (type == P9_TVERSION) 315 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1, 316 GFP_NOWAIT); 317 else 318 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT); 319 req->tc.tag = tag; 320 spin_unlock_irq(&c->lock); 321 idr_preload_end(); 322 if (tag < 0) 323 goto free; 324 325 /* Init ref to two because in the general case there is one ref 326 * that is put asynchronously by a writer thread, one ref 327 * temporarily given by p9_tag_lookup and put by p9_client_cb 328 * in the recv thread, and one ref put by p9_req_put in the 329 * main thread. The only exception is virtio that does not use 330 * p9_tag_lookup but does not have a writer thread either 331 * (the write happens synchronously in the request/zc_request 332 * callback), so p9_client_cb eats the second ref there 333 * as the pointer is duplicated directly by virtqueue_add_sgs() 334 */ 335 refcount_set(&req->refcount, 2); 336 337 return req; 338 339 free: 340 p9_fcall_fini(&req->tc); 341 p9_fcall_fini(&req->rc); 342 free_req: 343 kmem_cache_free(p9_req_cache, req); 344 return ERR_PTR(-ENOMEM); 345 } 346 347 /** 348 * p9_tag_lookup - Look up a request by tag. 349 * @c: Client session. 350 * @tag: Transaction ID. 351 * 352 * Context: Any context. 353 * Return: A request, or %NULL if there is no request with that tag. 354 */ 355 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 356 { 357 struct p9_req_t *req; 358 359 rcu_read_lock(); 360 again: 361 req = idr_find(&c->reqs, tag); 362 if (req) { 363 /* We have to be careful with the req found under rcu_read_lock 364 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the 365 * ref again without corrupting other data, then check again 366 * that the tag matches once we have the ref 367 */ 368 if (!p9_req_try_get(req)) 369 goto again; 370 if (req->tc.tag != tag) { 371 p9_req_put(c, req); 372 goto again; 373 } 374 } 375 rcu_read_unlock(); 376 377 return req; 378 } 379 EXPORT_SYMBOL(p9_tag_lookup); 380 381 /** 382 * p9_tag_remove - Remove a tag. 383 * @c: Client session. 384 * @r: Request of reference. 385 * 386 * Context: Any context. 387 */ 388 static void p9_tag_remove(struct p9_client *c, struct p9_req_t *r) 389 { 390 unsigned long flags; 391 u16 tag = r->tc.tag; 392 393 p9_debug(P9_DEBUG_MUX, "freeing clnt %p req %p tag: %d\n", c, r, tag); 394 spin_lock_irqsave(&c->lock, flags); 395 idr_remove(&c->reqs, tag); 396 spin_unlock_irqrestore(&c->lock, flags); 397 } 398 399 int p9_req_put(struct p9_client *c, struct p9_req_t *r) 400 { 401 if (refcount_dec_and_test(&r->refcount)) { 402 p9_tag_remove(c, r); 403 404 p9_fcall_fini(&r->tc); 405 p9_fcall_fini(&r->rc); 406 kmem_cache_free(p9_req_cache, r); 407 return 1; 408 } 409 return 0; 410 } 411 EXPORT_SYMBOL(p9_req_put); 412 413 /** 414 * p9_tag_cleanup - cleans up tags structure and reclaims resources 415 * @c: v9fs client struct 416 * 417 * This frees resources associated with the tags structure 418 * 419 */ 420 static void p9_tag_cleanup(struct p9_client *c) 421 { 422 struct p9_req_t *req; 423 int id; 424 425 rcu_read_lock(); 426 idr_for_each_entry(&c->reqs, req, id) { 427 pr_info("Tag %d still in use\n", id); 428 if (p9_req_put(c, req) == 0) 429 pr_warn("Packet with tag %d has still references", 430 req->tc.tag); 431 } 432 rcu_read_unlock(); 433 } 434 435 /** 436 * p9_client_cb - call back from transport to client 437 * @c: client state 438 * @req: request received 439 * @status: request status, one of REQ_STATUS_* 440 * 441 */ 442 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) 443 { 444 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); 445 446 /* This barrier is needed to make sure any change made to req before 447 * the status change is visible to another thread 448 */ 449 smp_wmb(); 450 WRITE_ONCE(req->status, status); 451 452 wake_up(&req->wq); 453 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); 454 p9_req_put(c, req); 455 } 456 EXPORT_SYMBOL(p9_client_cb); 457 458 /** 459 * p9_parse_header - parse header arguments out of a packet 460 * @pdu: packet to parse 461 * @size: size of packet 462 * @type: type of request 463 * @tag: tag of packet 464 * @rewind: set if we need to rewind offset afterwards 465 */ 466 467 int 468 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, 469 int16_t *tag, int rewind) 470 { 471 s8 r_type; 472 s16 r_tag; 473 s32 r_size; 474 int offset = pdu->offset; 475 int err; 476 477 pdu->offset = 0; 478 479 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 480 if (err) 481 goto rewind_and_exit; 482 483 if (type) 484 *type = r_type; 485 if (tag) 486 *tag = r_tag; 487 if (size) 488 *size = r_size; 489 490 if (pdu->size != r_size || r_size < 7) { 491 err = -EINVAL; 492 goto rewind_and_exit; 493 } 494 495 pdu->id = r_type; 496 pdu->tag = r_tag; 497 498 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 499 pdu->size, pdu->id, pdu->tag); 500 501 rewind_and_exit: 502 if (rewind) 503 pdu->offset = offset; 504 return err; 505 } 506 EXPORT_SYMBOL(p9_parse_header); 507 508 /** 509 * p9_check_errors - check 9p packet for error return and process it 510 * @c: current client instance 511 * @req: request to parse and check for error conditions 512 * 513 * returns error code if one is discovered, otherwise returns 0 514 * 515 * this will have to be more complicated if we have multiple 516 * error packet types 517 */ 518 519 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 520 { 521 s8 type; 522 int err; 523 int ecode; 524 525 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 526 if (req->rc.size > req->rc.capacity && !req->rc.zc) { 527 pr_err("requested packet size too big: %d does not fit %zu (type=%d)\n", 528 req->rc.size, req->rc.capacity, req->rc.id); 529 return -EIO; 530 } 531 /* dump the response from server 532 * This should be after check errors which poplulate pdu_fcall. 533 */ 534 trace_9p_protocol_dump(c, &req->rc); 535 if (err) { 536 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 537 return err; 538 } 539 if (type != P9_RERROR && type != P9_RLERROR) 540 return 0; 541 542 if (!p9_is_proto_dotl(c)) { 543 char *ename; 544 545 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 546 &ename, &ecode); 547 if (err) 548 goto out_err; 549 550 if (p9_is_proto_dotu(c) && ecode < 512) 551 err = -ecode; 552 553 if (!err) { 554 err = p9_errstr2errno(ename, strlen(ename)); 555 556 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 557 -ecode, ename); 558 } 559 kfree(ename); 560 } else { 561 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 562 if (err) 563 goto out_err; 564 err = -ecode; 565 566 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 567 } 568 569 return err; 570 571 out_err: 572 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 573 574 return err; 575 } 576 577 static struct p9_req_t * 578 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 579 580 /** 581 * p9_client_flush - flush (cancel) a request 582 * @c: client state 583 * @oldreq: request to cancel 584 * 585 * This sents a flush for a particular request and links 586 * the flush request to the original request. The current 587 * code only supports a single flush request although the protocol 588 * allows for multiple flush requests to be sent for a single request. 589 * 590 */ 591 592 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 593 { 594 struct p9_req_t *req; 595 s16 oldtag; 596 int err; 597 598 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); 599 if (err) 600 return err; 601 602 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 603 604 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 605 if (IS_ERR(req)) 606 return PTR_ERR(req); 607 608 /* if we haven't received a response for oldreq, 609 * remove it from the list 610 */ 611 if (READ_ONCE(oldreq->status) == REQ_STATUS_SENT) { 612 if (c->trans_mod->cancelled) 613 c->trans_mod->cancelled(c, oldreq); 614 } 615 616 p9_req_put(c, req); 617 return 0; 618 } 619 620 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 621 int8_t type, uint t_size, uint r_size, 622 const char *fmt, va_list ap) 623 { 624 int err; 625 struct p9_req_t *req; 626 va_list apc; 627 628 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 629 630 /* we allow for any status other than disconnected */ 631 if (c->status == Disconnected) 632 return ERR_PTR(-EIO); 633 634 /* if status is begin_disconnected we allow only clunk request */ 635 if (c->status == BeginDisconnect && type != P9_TCLUNK) 636 return ERR_PTR(-EIO); 637 638 va_copy(apc, ap); 639 req = p9_tag_alloc(c, type, t_size, r_size, fmt, apc); 640 va_end(apc); 641 if (IS_ERR(req)) 642 return req; 643 644 /* marshall the data */ 645 p9pdu_prepare(&req->tc, req->tc.tag, type); 646 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); 647 if (err) 648 goto reterr; 649 p9pdu_finalize(c, &req->tc); 650 trace_9p_client_req(c, type, req->tc.tag); 651 return req; 652 reterr: 653 p9_req_put(c, req); 654 /* We have to put also the 2nd reference as it won't be used */ 655 p9_req_put(c, req); 656 return ERR_PTR(err); 657 } 658 659 /** 660 * p9_client_rpc - issue a request and wait for a response 661 * @c: client session 662 * @type: type of request 663 * @fmt: protocol format string (see protocol.c) 664 * 665 * Returns request structure (which client must free using p9_req_put) 666 */ 667 668 static struct p9_req_t * 669 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 670 { 671 va_list ap; 672 int sigpending, err; 673 unsigned long flags; 674 struct p9_req_t *req; 675 /* Passing zero for tsize/rsize to p9_client_prepare_req() tells it to 676 * auto determine an appropriate (small) request/response size 677 * according to actual message data being sent. Currently RDMA 678 * transport is excluded from this response message size optimization, 679 * as it would not cope with it, due to its pooled response buffers 680 * (using an optimized request size for RDMA as well though). 681 */ 682 const uint tsize = 0; 683 const uint rsize = c->trans_mod->pooled_rbuffers ? c->msize : 0; 684 685 va_start(ap, fmt); 686 req = p9_client_prepare_req(c, type, tsize, rsize, fmt, ap); 687 va_end(ap); 688 if (IS_ERR(req)) 689 return req; 690 691 req->tc.zc = false; 692 req->rc.zc = false; 693 694 if (signal_pending(current)) { 695 sigpending = 1; 696 clear_thread_flag(TIF_SIGPENDING); 697 } else { 698 sigpending = 0; 699 } 700 701 err = c->trans_mod->request(c, req); 702 if (err < 0) { 703 /* write won't happen */ 704 p9_req_put(c, req); 705 if (err != -ERESTARTSYS && err != -EFAULT) 706 c->status = Disconnected; 707 goto recalc_sigpending; 708 } 709 again: 710 /* Wait for the response */ 711 err = wait_event_killable(req->wq, 712 READ_ONCE(req->status) >= REQ_STATUS_RCVD); 713 714 /* Make sure our req is coherent with regard to updates in other 715 * threads - echoes to wmb() in the callback 716 */ 717 smp_rmb(); 718 719 if (err == -ERESTARTSYS && c->status == Connected && 720 type == P9_TFLUSH) { 721 sigpending = 1; 722 clear_thread_flag(TIF_SIGPENDING); 723 goto again; 724 } 725 726 if (READ_ONCE(req->status) == REQ_STATUS_ERROR) { 727 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 728 err = req->t_err; 729 } 730 if (err == -ERESTARTSYS && c->status == Connected) { 731 p9_debug(P9_DEBUG_MUX, "flushing\n"); 732 sigpending = 1; 733 clear_thread_flag(TIF_SIGPENDING); 734 735 if (c->trans_mod->cancel(c, req)) 736 p9_client_flush(c, req); 737 738 /* if we received the response anyway, don't signal error */ 739 if (READ_ONCE(req->status) == REQ_STATUS_RCVD) 740 err = 0; 741 } 742 recalc_sigpending: 743 if (sigpending) { 744 spin_lock_irqsave(¤t->sighand->siglock, flags); 745 recalc_sigpending(); 746 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 747 } 748 if (err < 0) 749 goto reterr; 750 751 err = p9_check_errors(c, req); 752 trace_9p_client_res(c, type, req->rc.tag, err); 753 if (!err) 754 return req; 755 reterr: 756 p9_req_put(c, req); 757 return ERR_PTR(safe_errno(err)); 758 } 759 760 /** 761 * p9_client_zc_rpc - issue a request and wait for a response 762 * @c: client session 763 * @type: type of request 764 * @uidata: destination for zero copy read 765 * @uodata: source for zero copy write 766 * @inlen: read buffer size 767 * @olen: write buffer size 768 * @in_hdrlen: reader header size, This is the size of response protocol data 769 * @fmt: protocol format string (see protocol.c) 770 * 771 * Returns request structure (which client must free using p9_req_put) 772 */ 773 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 774 struct iov_iter *uidata, 775 struct iov_iter *uodata, 776 int inlen, int olen, int in_hdrlen, 777 const char *fmt, ...) 778 { 779 va_list ap; 780 int sigpending, err; 781 unsigned long flags; 782 struct p9_req_t *req; 783 784 va_start(ap, fmt); 785 /* We allocate a inline protocol data of only 4k bytes. 786 * The actual content is passed in zero-copy fashion. 787 */ 788 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, P9_ZC_HDR_SZ, fmt, ap); 789 va_end(ap); 790 if (IS_ERR(req)) 791 return req; 792 793 req->tc.zc = true; 794 req->rc.zc = true; 795 796 if (signal_pending(current)) { 797 sigpending = 1; 798 clear_thread_flag(TIF_SIGPENDING); 799 } else { 800 sigpending = 0; 801 } 802 803 err = c->trans_mod->zc_request(c, req, uidata, uodata, 804 inlen, olen, in_hdrlen); 805 if (err < 0) { 806 if (err == -EIO) 807 c->status = Disconnected; 808 if (err != -ERESTARTSYS) 809 goto recalc_sigpending; 810 } 811 if (READ_ONCE(req->status) == REQ_STATUS_ERROR) { 812 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 813 err = req->t_err; 814 } 815 if (err == -ERESTARTSYS && c->status == Connected) { 816 p9_debug(P9_DEBUG_MUX, "flushing\n"); 817 sigpending = 1; 818 clear_thread_flag(TIF_SIGPENDING); 819 820 if (c->trans_mod->cancel(c, req)) 821 p9_client_flush(c, req); 822 823 /* if we received the response anyway, don't signal error */ 824 if (READ_ONCE(req->status) == REQ_STATUS_RCVD) 825 err = 0; 826 } 827 recalc_sigpending: 828 if (sigpending) { 829 spin_lock_irqsave(¤t->sighand->siglock, flags); 830 recalc_sigpending(); 831 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 832 } 833 if (err < 0) 834 goto reterr; 835 836 err = p9_check_errors(c, req); 837 trace_9p_client_res(c, type, req->rc.tag, err); 838 if (!err) 839 return req; 840 reterr: 841 p9_req_put(c, req); 842 return ERR_PTR(safe_errno(err)); 843 } 844 845 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 846 { 847 int ret; 848 struct p9_fid *fid; 849 850 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 851 fid = kzalloc(sizeof(*fid), GFP_KERNEL); 852 if (!fid) 853 return NULL; 854 855 fid->mode = -1; 856 fid->uid = current_fsuid(); 857 fid->clnt = clnt; 858 refcount_set(&fid->count, 1); 859 860 idr_preload(GFP_KERNEL); 861 spin_lock_irq(&clnt->lock); 862 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, 863 GFP_NOWAIT); 864 spin_unlock_irq(&clnt->lock); 865 idr_preload_end(); 866 if (!ret) { 867 trace_9p_fid_ref(fid, P9_FID_REF_CREATE); 868 return fid; 869 } 870 871 kfree(fid); 872 return NULL; 873 } 874 875 static void p9_fid_destroy(struct p9_fid *fid) 876 { 877 struct p9_client *clnt; 878 unsigned long flags; 879 880 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 881 trace_9p_fid_ref(fid, P9_FID_REF_DESTROY); 882 clnt = fid->clnt; 883 spin_lock_irqsave(&clnt->lock, flags); 884 idr_remove(&clnt->fids, fid->fid); 885 spin_unlock_irqrestore(&clnt->lock, flags); 886 kfree(fid->rdir); 887 kfree(fid); 888 } 889 890 /* We also need to export tracepoint symbols for tracepoint_enabled() */ 891 EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref); 892 893 void do_trace_9p_fid_get(struct p9_fid *fid) 894 { 895 trace_9p_fid_ref(fid, P9_FID_REF_GET); 896 } 897 EXPORT_SYMBOL(do_trace_9p_fid_get); 898 899 void do_trace_9p_fid_put(struct p9_fid *fid) 900 { 901 trace_9p_fid_ref(fid, P9_FID_REF_PUT); 902 } 903 EXPORT_SYMBOL(do_trace_9p_fid_put); 904 905 static int p9_client_version(struct p9_client *c) 906 { 907 int err; 908 struct p9_req_t *req; 909 char *version = NULL; 910 int msize; 911 912 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 913 c->msize, c->proto_version); 914 915 switch (c->proto_version) { 916 case p9_proto_2000L: 917 req = p9_client_rpc(c, P9_TVERSION, "ds", 918 c->msize, "9P2000.L"); 919 break; 920 case p9_proto_2000u: 921 req = p9_client_rpc(c, P9_TVERSION, "ds", 922 c->msize, "9P2000.u"); 923 break; 924 case p9_proto_legacy: 925 req = p9_client_rpc(c, P9_TVERSION, "ds", 926 c->msize, "9P2000"); 927 break; 928 default: 929 return -EINVAL; 930 } 931 932 if (IS_ERR(req)) 933 return PTR_ERR(req); 934 935 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); 936 if (err) { 937 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 938 trace_9p_protocol_dump(c, &req->rc); 939 goto error; 940 } 941 942 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 943 if (!strncmp(version, "9P2000.L", 8)) { 944 c->proto_version = p9_proto_2000L; 945 } else if (!strncmp(version, "9P2000.u", 8)) { 946 c->proto_version = p9_proto_2000u; 947 } else if (!strncmp(version, "9P2000", 6)) { 948 c->proto_version = p9_proto_legacy; 949 } else { 950 p9_debug(P9_DEBUG_ERROR, 951 "server returned an unknown version: %s\n", version); 952 err = -EREMOTEIO; 953 goto error; 954 } 955 956 if (msize < 4096) { 957 p9_debug(P9_DEBUG_ERROR, 958 "server returned a msize < 4096: %d\n", msize); 959 err = -EREMOTEIO; 960 goto error; 961 } 962 if (msize < c->msize) 963 c->msize = msize; 964 965 error: 966 kfree(version); 967 p9_req_put(c, req); 968 969 return err; 970 } 971 972 struct p9_client *p9_client_create(const char *dev_name, char *options) 973 { 974 int err; 975 struct p9_client *clnt; 976 char *client_id; 977 978 clnt = kmalloc(sizeof(*clnt), GFP_KERNEL); 979 if (!clnt) 980 return ERR_PTR(-ENOMEM); 981 982 clnt->trans_mod = NULL; 983 clnt->trans = NULL; 984 clnt->fcall_cache = NULL; 985 986 client_id = utsname()->nodename; 987 memcpy(clnt->name, client_id, strlen(client_id) + 1); 988 989 spin_lock_init(&clnt->lock); 990 idr_init(&clnt->fids); 991 idr_init(&clnt->reqs); 992 993 err = parse_opts(options, clnt); 994 if (err < 0) 995 goto free_client; 996 997 if (!clnt->trans_mod) 998 clnt->trans_mod = v9fs_get_default_trans(); 999 1000 if (!clnt->trans_mod) { 1001 err = -EPROTONOSUPPORT; 1002 p9_debug(P9_DEBUG_ERROR, 1003 "No transport defined or default transport\n"); 1004 goto free_client; 1005 } 1006 1007 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1008 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1009 1010 err = clnt->trans_mod->create(clnt, dev_name, options); 1011 if (err) 1012 goto put_trans; 1013 1014 if (clnt->msize > clnt->trans_mod->maxsize) { 1015 clnt->msize = clnt->trans_mod->maxsize; 1016 pr_info("Limiting 'msize' to %d as this is the maximum " 1017 "supported by transport %s\n", 1018 clnt->msize, clnt->trans_mod->name 1019 ); 1020 } 1021 1022 if (clnt->msize < 4096) { 1023 p9_debug(P9_DEBUG_ERROR, 1024 "Please specify a msize of at least 4k\n"); 1025 err = -EINVAL; 1026 goto close_trans; 1027 } 1028 1029 err = p9_client_version(clnt); 1030 if (err) 1031 goto close_trans; 1032 1033 /* P9_HDRSZ + 4 is the smallest packet header we can have that is 1034 * followed by data accessed from userspace by read 1035 */ 1036 clnt->fcall_cache = 1037 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, 1038 0, 0, P9_HDRSZ + 4, 1039 clnt->msize - (P9_HDRSZ + 4), 1040 NULL); 1041 1042 return clnt; 1043 1044 close_trans: 1045 clnt->trans_mod->close(clnt); 1046 put_trans: 1047 v9fs_put_trans(clnt->trans_mod); 1048 free_client: 1049 kfree(clnt); 1050 return ERR_PTR(err); 1051 } 1052 EXPORT_SYMBOL(p9_client_create); 1053 1054 void p9_client_destroy(struct p9_client *clnt) 1055 { 1056 struct p9_fid *fid; 1057 int id; 1058 1059 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1060 1061 if (clnt->trans_mod) 1062 clnt->trans_mod->close(clnt); 1063 1064 v9fs_put_trans(clnt->trans_mod); 1065 1066 idr_for_each_entry(&clnt->fids, fid, id) { 1067 pr_info("Found fid %d not clunked\n", fid->fid); 1068 p9_fid_destroy(fid); 1069 } 1070 1071 p9_tag_cleanup(clnt); 1072 1073 kmem_cache_destroy(clnt->fcall_cache); 1074 kfree(clnt); 1075 } 1076 EXPORT_SYMBOL(p9_client_destroy); 1077 1078 void p9_client_disconnect(struct p9_client *clnt) 1079 { 1080 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1081 clnt->status = Disconnected; 1082 } 1083 EXPORT_SYMBOL(p9_client_disconnect); 1084 1085 void p9_client_begin_disconnect(struct p9_client *clnt) 1086 { 1087 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1088 clnt->status = BeginDisconnect; 1089 } 1090 EXPORT_SYMBOL(p9_client_begin_disconnect); 1091 1092 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1093 const char *uname, kuid_t n_uname, 1094 const char *aname) 1095 { 1096 int err; 1097 struct p9_req_t *req; 1098 struct p9_fid *fid; 1099 struct p9_qid qid; 1100 1101 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1102 afid ? afid->fid : -1, uname, aname); 1103 fid = p9_fid_create(clnt); 1104 if (!fid) { 1105 err = -ENOMEM; 1106 goto error; 1107 } 1108 fid->uid = n_uname; 1109 1110 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1111 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1112 if (IS_ERR(req)) { 1113 err = PTR_ERR(req); 1114 goto error; 1115 } 1116 1117 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); 1118 if (err) { 1119 trace_9p_protocol_dump(clnt, &req->rc); 1120 p9_req_put(clnt, req); 1121 goto error; 1122 } 1123 1124 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1125 qid.type, qid.path, qid.version); 1126 1127 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1128 1129 p9_req_put(clnt, req); 1130 return fid; 1131 1132 error: 1133 if (fid) 1134 p9_fid_destroy(fid); 1135 return ERR_PTR(err); 1136 } 1137 EXPORT_SYMBOL(p9_client_attach); 1138 1139 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1140 const unsigned char * const *wnames, int clone) 1141 { 1142 int err; 1143 struct p9_client *clnt; 1144 struct p9_fid *fid; 1145 struct p9_qid *wqids; 1146 struct p9_req_t *req; 1147 u16 nwqids, count; 1148 1149 wqids = NULL; 1150 clnt = oldfid->clnt; 1151 if (clone) { 1152 fid = p9_fid_create(clnt); 1153 if (!fid) { 1154 err = -ENOMEM; 1155 goto error; 1156 } 1157 1158 fid->uid = oldfid->uid; 1159 } else { 1160 fid = oldfid; 1161 } 1162 1163 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1164 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1165 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1166 nwname, wnames); 1167 if (IS_ERR(req)) { 1168 err = PTR_ERR(req); 1169 goto error; 1170 } 1171 1172 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1173 if (err) { 1174 trace_9p_protocol_dump(clnt, &req->rc); 1175 p9_req_put(clnt, req); 1176 goto clunk_fid; 1177 } 1178 p9_req_put(clnt, req); 1179 1180 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1181 1182 if (nwqids != nwname) { 1183 err = -ENOENT; 1184 goto clunk_fid; 1185 } 1186 1187 for (count = 0; count < nwqids; count++) 1188 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1189 count, wqids[count].type, 1190 wqids[count].path, 1191 wqids[count].version); 1192 1193 if (nwname) 1194 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1195 else 1196 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); 1197 1198 kfree(wqids); 1199 return fid; 1200 1201 clunk_fid: 1202 kfree(wqids); 1203 p9_fid_put(fid); 1204 fid = NULL; 1205 1206 error: 1207 if (fid && fid != oldfid) 1208 p9_fid_destroy(fid); 1209 1210 return ERR_PTR(err); 1211 } 1212 EXPORT_SYMBOL(p9_client_walk); 1213 1214 int p9_client_open(struct p9_fid *fid, int mode) 1215 { 1216 int err; 1217 struct p9_client *clnt; 1218 struct p9_req_t *req; 1219 struct p9_qid qid; 1220 int iounit; 1221 1222 clnt = fid->clnt; 1223 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1224 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1225 1226 if (fid->mode != -1) 1227 return -EINVAL; 1228 1229 if (p9_is_proto_dotl(clnt)) 1230 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode & P9L_MODE_MASK); 1231 else 1232 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode & P9L_MODE_MASK); 1233 if (IS_ERR(req)) { 1234 err = PTR_ERR(req); 1235 goto error; 1236 } 1237 1238 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1239 if (err) { 1240 trace_9p_protocol_dump(clnt, &req->rc); 1241 goto free_and_error; 1242 } 1243 1244 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1245 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1246 qid.path, qid.version, iounit); 1247 1248 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1249 fid->mode = mode; 1250 fid->iounit = iounit; 1251 1252 free_and_error: 1253 p9_req_put(clnt, req); 1254 error: 1255 return err; 1256 } 1257 EXPORT_SYMBOL(p9_client_open); 1258 1259 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, 1260 u32 mode, kgid_t gid, struct p9_qid *qid) 1261 { 1262 int err; 1263 struct p9_client *clnt; 1264 struct p9_req_t *req; 1265 int iounit; 1266 1267 p9_debug(P9_DEBUG_9P, 1268 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1269 ofid->fid, name, flags, mode, 1270 from_kgid(&init_user_ns, gid)); 1271 clnt = ofid->clnt; 1272 1273 if (ofid->mode != -1) 1274 return -EINVAL; 1275 1276 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1277 mode & P9L_MODE_MASK, gid); 1278 if (IS_ERR(req)) { 1279 err = PTR_ERR(req); 1280 goto error; 1281 } 1282 1283 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); 1284 if (err) { 1285 trace_9p_protocol_dump(clnt, &req->rc); 1286 goto free_and_error; 1287 } 1288 1289 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1290 qid->type, qid->path, qid->version, iounit); 1291 1292 memmove(&ofid->qid, qid, sizeof(struct p9_qid)); 1293 ofid->mode = flags; 1294 ofid->iounit = iounit; 1295 1296 free_and_error: 1297 p9_req_put(clnt, req); 1298 error: 1299 return err; 1300 } 1301 EXPORT_SYMBOL(p9_client_create_dotl); 1302 1303 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1304 char *extension) 1305 { 1306 int err; 1307 struct p9_client *clnt; 1308 struct p9_req_t *req; 1309 struct p9_qid qid; 1310 int iounit; 1311 1312 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1313 fid->fid, name, perm, mode); 1314 clnt = fid->clnt; 1315 1316 if (fid->mode != -1) 1317 return -EINVAL; 1318 1319 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1320 mode & P9L_MODE_MASK, extension); 1321 if (IS_ERR(req)) { 1322 err = PTR_ERR(req); 1323 goto error; 1324 } 1325 1326 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1327 if (err) { 1328 trace_9p_protocol_dump(clnt, &req->rc); 1329 goto free_and_error; 1330 } 1331 1332 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1333 qid.type, qid.path, qid.version, iounit); 1334 1335 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1336 fid->mode = mode; 1337 fid->iounit = iounit; 1338 1339 free_and_error: 1340 p9_req_put(clnt, req); 1341 error: 1342 return err; 1343 } 1344 EXPORT_SYMBOL(p9_client_fcreate); 1345 1346 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1347 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1348 { 1349 int err; 1350 struct p9_client *clnt; 1351 struct p9_req_t *req; 1352 1353 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1354 dfid->fid, name, symtgt); 1355 clnt = dfid->clnt; 1356 1357 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1358 gid); 1359 if (IS_ERR(req)) { 1360 err = PTR_ERR(req); 1361 goto error; 1362 } 1363 1364 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 1365 if (err) { 1366 trace_9p_protocol_dump(clnt, &req->rc); 1367 goto free_and_error; 1368 } 1369 1370 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1371 qid->type, qid->path, qid->version); 1372 1373 free_and_error: 1374 p9_req_put(clnt, req); 1375 error: 1376 return err; 1377 } 1378 EXPORT_SYMBOL(p9_client_symlink); 1379 1380 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1381 { 1382 struct p9_client *clnt; 1383 struct p9_req_t *req; 1384 1385 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1386 dfid->fid, oldfid->fid, newname); 1387 clnt = dfid->clnt; 1388 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1389 newname); 1390 if (IS_ERR(req)) 1391 return PTR_ERR(req); 1392 1393 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1394 p9_req_put(clnt, req); 1395 return 0; 1396 } 1397 EXPORT_SYMBOL(p9_client_link); 1398 1399 int p9_client_fsync(struct p9_fid *fid, int datasync) 1400 { 1401 int err = 0; 1402 struct p9_client *clnt; 1403 struct p9_req_t *req; 1404 1405 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1406 fid->fid, datasync); 1407 clnt = fid->clnt; 1408 1409 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1410 if (IS_ERR(req)) { 1411 err = PTR_ERR(req); 1412 goto error; 1413 } 1414 1415 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1416 1417 p9_req_put(clnt, req); 1418 1419 error: 1420 return err; 1421 } 1422 EXPORT_SYMBOL(p9_client_fsync); 1423 1424 int p9_client_clunk(struct p9_fid *fid) 1425 { 1426 int err = 0; 1427 struct p9_client *clnt; 1428 struct p9_req_t *req; 1429 int retries = 0; 1430 1431 again: 1432 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", 1433 fid->fid, retries); 1434 clnt = fid->clnt; 1435 1436 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1437 if (IS_ERR(req)) { 1438 err = PTR_ERR(req); 1439 goto error; 1440 } 1441 1442 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1443 1444 p9_req_put(clnt, req); 1445 error: 1446 /* Fid is not valid even after a failed clunk 1447 * If interrupted, retry once then give up and 1448 * leak fid until umount. 1449 */ 1450 if (err == -ERESTARTSYS) { 1451 if (retries++ == 0) 1452 goto again; 1453 } else { 1454 p9_fid_destroy(fid); 1455 } 1456 return err; 1457 } 1458 EXPORT_SYMBOL(p9_client_clunk); 1459 1460 int p9_client_remove(struct p9_fid *fid) 1461 { 1462 int err = 0; 1463 struct p9_client *clnt; 1464 struct p9_req_t *req; 1465 1466 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1467 clnt = fid->clnt; 1468 1469 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1470 if (IS_ERR(req)) { 1471 err = PTR_ERR(req); 1472 goto error; 1473 } 1474 1475 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1476 1477 p9_req_put(clnt, req); 1478 error: 1479 if (err == -ERESTARTSYS) 1480 p9_fid_put(fid); 1481 else 1482 p9_fid_destroy(fid); 1483 return err; 1484 } 1485 EXPORT_SYMBOL(p9_client_remove); 1486 1487 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1488 { 1489 int err = 0; 1490 struct p9_req_t *req; 1491 struct p9_client *clnt; 1492 1493 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1494 dfid->fid, name, flags); 1495 1496 clnt = dfid->clnt; 1497 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1498 if (IS_ERR(req)) { 1499 err = PTR_ERR(req); 1500 goto error; 1501 } 1502 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1503 1504 p9_req_put(clnt, req); 1505 error: 1506 return err; 1507 } 1508 EXPORT_SYMBOL(p9_client_unlinkat); 1509 1510 int 1511 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1512 { 1513 int total = 0; 1514 *err = 0; 1515 1516 while (iov_iter_count(to)) { 1517 int count; 1518 1519 count = p9_client_read_once(fid, offset, to, err); 1520 if (!count || *err) 1521 break; 1522 offset += count; 1523 total += count; 1524 } 1525 return total; 1526 } 1527 EXPORT_SYMBOL(p9_client_read); 1528 1529 int 1530 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, 1531 int *err) 1532 { 1533 struct p9_client *clnt = fid->clnt; 1534 struct p9_req_t *req; 1535 int count = iov_iter_count(to); 1536 int rsize, received, non_zc = 0; 1537 char *dataptr; 1538 1539 *err = 0; 1540 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n", 1541 fid->fid, offset, iov_iter_count(to)); 1542 1543 rsize = fid->iounit; 1544 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1545 rsize = clnt->msize - P9_IOHDRSZ; 1546 1547 if (count < rsize) 1548 rsize = count; 1549 1550 /* Don't bother zerocopy for small IO (< 1024) */ 1551 if (clnt->trans_mod->zc_request && rsize > 1024) { 1552 /* response header len is 11 1553 * PDU Header(7) + IO Size (4) 1554 */ 1555 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1556 0, 11, "dqd", fid->fid, 1557 offset, rsize); 1558 } else { 1559 non_zc = 1; 1560 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1561 rsize); 1562 } 1563 if (IS_ERR(req)) { 1564 *err = PTR_ERR(req); 1565 if (!non_zc) 1566 iov_iter_revert(to, count - iov_iter_count(to)); 1567 return 0; 1568 } 1569 1570 *err = p9pdu_readf(&req->rc, clnt->proto_version, 1571 "D", &received, &dataptr); 1572 if (*err) { 1573 if (!non_zc) 1574 iov_iter_revert(to, count - iov_iter_count(to)); 1575 trace_9p_protocol_dump(clnt, &req->rc); 1576 p9_req_put(clnt, req); 1577 return 0; 1578 } 1579 if (rsize < received) { 1580 pr_err("bogus RREAD count (%d > %d)\n", received, rsize); 1581 received = rsize; 1582 } 1583 1584 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1585 1586 if (non_zc) { 1587 int n = copy_to_iter(dataptr, received, to); 1588 1589 if (n != received) { 1590 *err = -EFAULT; 1591 p9_req_put(clnt, req); 1592 return n; 1593 } 1594 } else { 1595 iov_iter_revert(to, count - received - iov_iter_count(to)); 1596 } 1597 p9_req_put(clnt, req); 1598 return received; 1599 } 1600 EXPORT_SYMBOL(p9_client_read_once); 1601 1602 int 1603 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1604 { 1605 struct p9_client *clnt = fid->clnt; 1606 struct p9_req_t *req; 1607 int total = 0; 1608 *err = 0; 1609 1610 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", 1611 fid->fid, offset, iov_iter_count(from)); 1612 1613 while (iov_iter_count(from)) { 1614 int count = iov_iter_count(from); 1615 int rsize = fid->iounit; 1616 int written; 1617 1618 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1619 rsize = clnt->msize - P9_IOHDRSZ; 1620 1621 if (count < rsize) 1622 rsize = count; 1623 1624 /* Don't bother zerocopy for small IO (< 1024) */ 1625 if (clnt->trans_mod->zc_request && rsize > 1024) { 1626 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1627 rsize, P9_ZC_HDR_SZ, "dqd", 1628 fid->fid, offset, rsize); 1629 } else { 1630 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1631 offset, rsize, from); 1632 } 1633 if (IS_ERR(req)) { 1634 iov_iter_revert(from, count - iov_iter_count(from)); 1635 *err = PTR_ERR(req); 1636 break; 1637 } 1638 1639 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written); 1640 if (*err) { 1641 iov_iter_revert(from, count - iov_iter_count(from)); 1642 trace_9p_protocol_dump(clnt, &req->rc); 1643 p9_req_put(clnt, req); 1644 break; 1645 } 1646 if (rsize < written) { 1647 pr_err("bogus RWRITE count (%d > %d)\n", written, rsize); 1648 written = rsize; 1649 } 1650 1651 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1652 1653 p9_req_put(clnt, req); 1654 iov_iter_revert(from, count - written - iov_iter_count(from)); 1655 total += written; 1656 offset += written; 1657 } 1658 return total; 1659 } 1660 EXPORT_SYMBOL(p9_client_write); 1661 1662 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1663 { 1664 int err; 1665 struct p9_client *clnt; 1666 struct p9_wstat *ret; 1667 struct p9_req_t *req; 1668 u16 ignored; 1669 1670 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1671 1672 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1673 if (!ret) 1674 return ERR_PTR(-ENOMEM); 1675 1676 clnt = fid->clnt; 1677 1678 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1679 if (IS_ERR(req)) { 1680 err = PTR_ERR(req); 1681 goto error; 1682 } 1683 1684 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); 1685 if (err) { 1686 trace_9p_protocol_dump(clnt, &req->rc); 1687 p9_req_put(clnt, req); 1688 goto error; 1689 } 1690 1691 p9_debug(P9_DEBUG_9P, 1692 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1693 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1694 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1695 "<<< uid=%d gid=%d n_muid=%d\n", 1696 ret->size, ret->type, ret->dev, ret->qid.type, ret->qid.path, 1697 ret->qid.version, ret->mode, 1698 ret->atime, ret->mtime, ret->length, 1699 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1700 from_kuid(&init_user_ns, ret->n_uid), 1701 from_kgid(&init_user_ns, ret->n_gid), 1702 from_kuid(&init_user_ns, ret->n_muid)); 1703 1704 p9_req_put(clnt, req); 1705 return ret; 1706 1707 error: 1708 kfree(ret); 1709 return ERR_PTR(err); 1710 } 1711 EXPORT_SYMBOL(p9_client_stat); 1712 1713 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1714 u64 request_mask) 1715 { 1716 int err; 1717 struct p9_client *clnt; 1718 struct p9_stat_dotl *ret; 1719 struct p9_req_t *req; 1720 1721 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1722 fid->fid, request_mask); 1723 1724 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1725 if (!ret) 1726 return ERR_PTR(-ENOMEM); 1727 1728 clnt = fid->clnt; 1729 1730 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1731 if (IS_ERR(req)) { 1732 err = PTR_ERR(req); 1733 goto error; 1734 } 1735 1736 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); 1737 if (err) { 1738 trace_9p_protocol_dump(clnt, &req->rc); 1739 p9_req_put(clnt, req); 1740 goto error; 1741 } 1742 1743 p9_debug(P9_DEBUG_9P, "<<< RGETATTR st_result_mask=%lld\n" 1744 "<<< qid=%x.%llx.%x\n" 1745 "<<< st_mode=%8.8x st_nlink=%llu\n" 1746 "<<< st_uid=%d st_gid=%d\n" 1747 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1748 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1749 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1750 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1751 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1752 "<<< st_gen=%lld st_data_version=%lld\n", 1753 ret->st_result_mask, 1754 ret->qid.type, ret->qid.path, ret->qid.version, 1755 ret->st_mode, ret->st_nlink, 1756 from_kuid(&init_user_ns, ret->st_uid), 1757 from_kgid(&init_user_ns, ret->st_gid), 1758 ret->st_rdev, ret->st_size, ret->st_blksize, ret->st_blocks, 1759 ret->st_atime_sec, ret->st_atime_nsec, 1760 ret->st_mtime_sec, ret->st_mtime_nsec, 1761 ret->st_ctime_sec, ret->st_ctime_nsec, 1762 ret->st_btime_sec, ret->st_btime_nsec, 1763 ret->st_gen, ret->st_data_version); 1764 1765 p9_req_put(clnt, req); 1766 return ret; 1767 1768 error: 1769 kfree(ret); 1770 return ERR_PTR(err); 1771 } 1772 EXPORT_SYMBOL(p9_client_getattr_dotl); 1773 1774 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1775 { 1776 int ret; 1777 1778 /* NOTE: size shouldn't include its own length */ 1779 /* size[2] type[2] dev[4] qid[13] */ 1780 /* mode[4] atime[4] mtime[4] length[8]*/ 1781 /* name[s] uid[s] gid[s] muid[s] */ 1782 ret = 2 + 4 + 13 + 4 + 4 + 4 + 8 + 2 + 2 + 2 + 2; 1783 1784 if (wst->name) 1785 ret += strlen(wst->name); 1786 if (wst->uid) 1787 ret += strlen(wst->uid); 1788 if (wst->gid) 1789 ret += strlen(wst->gid); 1790 if (wst->muid) 1791 ret += strlen(wst->muid); 1792 1793 if (proto_version == p9_proto_2000u || 1794 proto_version == p9_proto_2000L) { 1795 /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1796 ret += 2 + 4 + 4 + 4; 1797 if (wst->extension) 1798 ret += strlen(wst->extension); 1799 } 1800 1801 return ret; 1802 } 1803 1804 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1805 { 1806 int err = 0; 1807 struct p9_req_t *req; 1808 struct p9_client *clnt; 1809 1810 clnt = fid->clnt; 1811 wst->size = p9_client_statsize(wst, clnt->proto_version); 1812 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", 1813 fid->fid); 1814 p9_debug(P9_DEBUG_9P, 1815 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1816 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1817 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1818 " uid=%d gid=%d n_muid=%d\n", 1819 wst->size, wst->type, wst->dev, wst->qid.type, 1820 wst->qid.path, wst->qid.version, 1821 wst->mode, wst->atime, wst->mtime, wst->length, 1822 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1823 from_kuid(&init_user_ns, wst->n_uid), 1824 from_kgid(&init_user_ns, wst->n_gid), 1825 from_kuid(&init_user_ns, wst->n_muid)); 1826 1827 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", 1828 fid->fid, wst->size + 2, wst); 1829 if (IS_ERR(req)) { 1830 err = PTR_ERR(req); 1831 goto error; 1832 } 1833 1834 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1835 1836 p9_req_put(clnt, req); 1837 error: 1838 return err; 1839 } 1840 EXPORT_SYMBOL(p9_client_wstat); 1841 1842 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1843 { 1844 int err = 0; 1845 struct p9_req_t *req; 1846 struct p9_client *clnt; 1847 1848 clnt = fid->clnt; 1849 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1850 p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n", 1851 p9attr->valid, p9attr->mode, 1852 from_kuid(&init_user_ns, p9attr->uid), 1853 from_kgid(&init_user_ns, p9attr->gid), 1854 p9attr->size); 1855 p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n", 1856 p9attr->atime_sec, p9attr->atime_nsec); 1857 p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n", 1858 p9attr->mtime_sec, p9attr->mtime_nsec); 1859 1860 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1861 1862 if (IS_ERR(req)) { 1863 err = PTR_ERR(req); 1864 goto error; 1865 } 1866 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1867 p9_req_put(clnt, req); 1868 error: 1869 return err; 1870 } 1871 EXPORT_SYMBOL(p9_client_setattr); 1872 1873 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1874 { 1875 int err; 1876 struct p9_req_t *req; 1877 struct p9_client *clnt; 1878 1879 clnt = fid->clnt; 1880 1881 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1882 1883 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1884 if (IS_ERR(req)) { 1885 err = PTR_ERR(req); 1886 goto error; 1887 } 1888 1889 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1890 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1891 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1892 if (err) { 1893 trace_9p_protocol_dump(clnt, &req->rc); 1894 p9_req_put(clnt, req); 1895 goto error; 1896 } 1897 1898 p9_debug(P9_DEBUG_9P, 1899 "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n", 1900 fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree, 1901 sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen); 1902 1903 p9_req_put(clnt, req); 1904 error: 1905 return err; 1906 } 1907 EXPORT_SYMBOL(p9_client_statfs); 1908 1909 int p9_client_rename(struct p9_fid *fid, 1910 struct p9_fid *newdirfid, const char *name) 1911 { 1912 int err = 0; 1913 struct p9_req_t *req; 1914 struct p9_client *clnt; 1915 1916 clnt = fid->clnt; 1917 1918 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1919 fid->fid, newdirfid->fid, name); 1920 1921 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1922 newdirfid->fid, name); 1923 if (IS_ERR(req)) { 1924 err = PTR_ERR(req); 1925 goto error; 1926 } 1927 1928 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1929 1930 p9_req_put(clnt, req); 1931 error: 1932 return err; 1933 } 1934 EXPORT_SYMBOL(p9_client_rename); 1935 1936 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1937 struct p9_fid *newdirfid, const char *new_name) 1938 { 1939 int err = 0; 1940 struct p9_req_t *req; 1941 struct p9_client *clnt; 1942 1943 clnt = olddirfid->clnt; 1944 1945 p9_debug(P9_DEBUG_9P, 1946 ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n", 1947 olddirfid->fid, old_name, newdirfid->fid, new_name); 1948 1949 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1950 old_name, newdirfid->fid, new_name); 1951 if (IS_ERR(req)) { 1952 err = PTR_ERR(req); 1953 goto error; 1954 } 1955 1956 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1957 newdirfid->fid, new_name); 1958 1959 p9_req_put(clnt, req); 1960 error: 1961 return err; 1962 } 1963 EXPORT_SYMBOL(p9_client_renameat); 1964 1965 /* An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1966 */ 1967 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1968 const char *attr_name, u64 *attr_size) 1969 { 1970 int err; 1971 struct p9_req_t *req; 1972 struct p9_client *clnt; 1973 struct p9_fid *attr_fid; 1974 1975 clnt = file_fid->clnt; 1976 attr_fid = p9_fid_create(clnt); 1977 if (!attr_fid) { 1978 err = -ENOMEM; 1979 goto error; 1980 } 1981 p9_debug(P9_DEBUG_9P, 1982 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 1983 file_fid->fid, attr_fid->fid, attr_name); 1984 1985 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 1986 file_fid->fid, attr_fid->fid, attr_name); 1987 if (IS_ERR(req)) { 1988 err = PTR_ERR(req); 1989 goto error; 1990 } 1991 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); 1992 if (err) { 1993 trace_9p_protocol_dump(clnt, &req->rc); 1994 p9_req_put(clnt, req); 1995 goto clunk_fid; 1996 } 1997 p9_req_put(clnt, req); 1998 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 1999 attr_fid->fid, *attr_size); 2000 return attr_fid; 2001 clunk_fid: 2002 p9_fid_put(attr_fid); 2003 attr_fid = NULL; 2004 error: 2005 if (attr_fid && attr_fid != file_fid) 2006 p9_fid_destroy(attr_fid); 2007 2008 return ERR_PTR(err); 2009 } 2010 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2011 2012 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2013 u64 attr_size, int flags) 2014 { 2015 int err = 0; 2016 struct p9_req_t *req; 2017 struct p9_client *clnt; 2018 2019 p9_debug(P9_DEBUG_9P, 2020 ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n", 2021 fid->fid, name, attr_size, flags); 2022 clnt = fid->clnt; 2023 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2024 fid->fid, name, attr_size, flags); 2025 if (IS_ERR(req)) { 2026 err = PTR_ERR(req); 2027 goto error; 2028 } 2029 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2030 p9_req_put(clnt, req); 2031 error: 2032 return err; 2033 } 2034 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2035 2036 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2037 { 2038 int err, rsize, non_zc = 0; 2039 struct p9_client *clnt; 2040 struct p9_req_t *req; 2041 char *dataptr; 2042 struct kvec kv = {.iov_base = data, .iov_len = count}; 2043 struct iov_iter to; 2044 2045 iov_iter_kvec(&to, ITER_DEST, &kv, 1, count); 2046 2047 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2048 fid->fid, offset, count); 2049 2050 clnt = fid->clnt; 2051 2052 rsize = fid->iounit; 2053 if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ) 2054 rsize = clnt->msize - P9_READDIRHDRSZ; 2055 2056 if (count < rsize) 2057 rsize = count; 2058 2059 /* Don't bother zerocopy for small IO (< 1024) */ 2060 if (clnt->trans_mod->zc_request && rsize > 1024) { 2061 /* response header len is 11 2062 * PDU Header(7) + IO Size (4) 2063 */ 2064 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2065 11, "dqd", fid->fid, offset, rsize); 2066 } else { 2067 non_zc = 1; 2068 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2069 offset, rsize); 2070 } 2071 if (IS_ERR(req)) { 2072 err = PTR_ERR(req); 2073 goto error; 2074 } 2075 2076 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); 2077 if (err) { 2078 trace_9p_protocol_dump(clnt, &req->rc); 2079 goto free_and_error; 2080 } 2081 if (rsize < count) { 2082 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2083 count = rsize; 2084 } 2085 2086 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2087 2088 if (non_zc) 2089 memmove(data, dataptr, count); 2090 2091 p9_req_put(clnt, req); 2092 return count; 2093 2094 free_and_error: 2095 p9_req_put(clnt, req); 2096 error: 2097 return err; 2098 } 2099 EXPORT_SYMBOL(p9_client_readdir); 2100 2101 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2102 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2103 { 2104 int err; 2105 struct p9_client *clnt; 2106 struct p9_req_t *req; 2107 2108 clnt = fid->clnt; 2109 p9_debug(P9_DEBUG_9P, 2110 ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n", 2111 fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2112 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2113 MAJOR(rdev), MINOR(rdev), gid); 2114 if (IS_ERR(req)) 2115 return PTR_ERR(req); 2116 2117 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2118 if (err) { 2119 trace_9p_protocol_dump(clnt, &req->rc); 2120 goto error; 2121 } 2122 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", 2123 qid->type, qid->path, qid->version); 2124 2125 error: 2126 p9_req_put(clnt, req); 2127 return err; 2128 } 2129 EXPORT_SYMBOL(p9_client_mknod_dotl); 2130 2131 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2132 kgid_t gid, struct p9_qid *qid) 2133 { 2134 int err; 2135 struct p9_client *clnt; 2136 struct p9_req_t *req; 2137 2138 clnt = fid->clnt; 2139 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2140 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2141 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", 2142 fid->fid, name, mode, gid); 2143 if (IS_ERR(req)) 2144 return PTR_ERR(req); 2145 2146 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2147 if (err) { 2148 trace_9p_protocol_dump(clnt, &req->rc); 2149 goto error; 2150 } 2151 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2152 qid->path, qid->version); 2153 2154 error: 2155 p9_req_put(clnt, req); 2156 return err; 2157 } 2158 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2159 2160 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2161 { 2162 int err; 2163 struct p9_client *clnt; 2164 struct p9_req_t *req; 2165 2166 clnt = fid->clnt; 2167 p9_debug(P9_DEBUG_9P, 2168 ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n", 2169 fid->fid, flock->type, flock->flags, flock->start, 2170 flock->length, flock->proc_id, flock->client_id); 2171 2172 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2173 flock->flags, flock->start, flock->length, 2174 flock->proc_id, flock->client_id); 2175 2176 if (IS_ERR(req)) 2177 return PTR_ERR(req); 2178 2179 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); 2180 if (err) { 2181 trace_9p_protocol_dump(clnt, &req->rc); 2182 goto error; 2183 } 2184 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2185 error: 2186 p9_req_put(clnt, req); 2187 return err; 2188 } 2189 EXPORT_SYMBOL(p9_client_lock_dotl); 2190 2191 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2192 { 2193 int err; 2194 struct p9_client *clnt; 2195 struct p9_req_t *req; 2196 2197 clnt = fid->clnt; 2198 p9_debug(P9_DEBUG_9P, 2199 ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n", 2200 fid->fid, glock->type, glock->start, glock->length, 2201 glock->proc_id, glock->client_id); 2202 2203 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, 2204 glock->type, glock->start, glock->length, 2205 glock->proc_id, glock->client_id); 2206 2207 if (IS_ERR(req)) 2208 return PTR_ERR(req); 2209 2210 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, 2211 &glock->start, &glock->length, &glock->proc_id, 2212 &glock->client_id); 2213 if (err) { 2214 trace_9p_protocol_dump(clnt, &req->rc); 2215 goto error; 2216 } 2217 p9_debug(P9_DEBUG_9P, 2218 "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n", 2219 glock->type, glock->start, glock->length, 2220 glock->proc_id, glock->client_id); 2221 error: 2222 p9_req_put(clnt, req); 2223 return err; 2224 } 2225 EXPORT_SYMBOL(p9_client_getlock_dotl); 2226 2227 int p9_client_readlink(struct p9_fid *fid, char **target) 2228 { 2229 int err; 2230 struct p9_client *clnt; 2231 struct p9_req_t *req; 2232 2233 clnt = fid->clnt; 2234 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2235 2236 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2237 if (IS_ERR(req)) 2238 return PTR_ERR(req); 2239 2240 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); 2241 if (err) { 2242 trace_9p_protocol_dump(clnt, &req->rc); 2243 goto error; 2244 } 2245 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2246 error: 2247 p9_req_put(clnt, req); 2248 return err; 2249 } 2250 EXPORT_SYMBOL(p9_client_readlink); 2251 2252 int __init p9_client_init(void) 2253 { 2254 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); 2255 return p9_req_cache ? 0 : -ENOMEM; 2256 } 2257 2258 void __exit p9_client_exit(void) 2259 { 2260 kmem_cache_destroy(p9_req_cache); 2261 } 2262