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 static atomic_t seqno = ATOMIC_INIT(0); 980 struct p9_client *clnt; 981 char *client_id; 982 char *cache_name; 983 984 clnt = kmalloc(sizeof(*clnt), GFP_KERNEL); 985 if (!clnt) 986 return ERR_PTR(-ENOMEM); 987 988 clnt->trans_mod = NULL; 989 clnt->trans = NULL; 990 clnt->fcall_cache = NULL; 991 992 client_id = utsname()->nodename; 993 memcpy(clnt->name, client_id, strlen(client_id) + 1); 994 995 spin_lock_init(&clnt->lock); 996 idr_init(&clnt->fids); 997 idr_init(&clnt->reqs); 998 999 err = parse_opts(options, clnt); 1000 if (err < 0) 1001 goto free_client; 1002 1003 if (!clnt->trans_mod) 1004 clnt->trans_mod = v9fs_get_default_trans(); 1005 1006 if (!clnt->trans_mod) { 1007 err = -EPROTONOSUPPORT; 1008 p9_debug(P9_DEBUG_ERROR, 1009 "No transport defined or default transport\n"); 1010 goto free_client; 1011 } 1012 1013 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1014 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1015 1016 err = clnt->trans_mod->create(clnt, dev_name, options); 1017 if (err) 1018 goto put_trans; 1019 1020 if (clnt->msize > clnt->trans_mod->maxsize) { 1021 clnt->msize = clnt->trans_mod->maxsize; 1022 pr_info("Limiting 'msize' to %d as this is the maximum " 1023 "supported by transport %s\n", 1024 clnt->msize, clnt->trans_mod->name 1025 ); 1026 } 1027 1028 if (clnt->msize < 4096) { 1029 p9_debug(P9_DEBUG_ERROR, 1030 "Please specify a msize of at least 4k\n"); 1031 err = -EINVAL; 1032 goto close_trans; 1033 } 1034 1035 err = p9_client_version(clnt); 1036 if (err) 1037 goto close_trans; 1038 1039 cache_name = kasprintf(GFP_KERNEL, 1040 "9p-fcall-cache-%u", atomic_inc_return(&seqno)); 1041 if (!cache_name) { 1042 err = -ENOMEM; 1043 goto close_trans; 1044 } 1045 1046 /* P9_HDRSZ + 4 is the smallest packet header we can have that is 1047 * followed by data accessed from userspace by read 1048 */ 1049 clnt->fcall_cache = 1050 kmem_cache_create_usercopy(cache_name, clnt->msize, 1051 0, 0, P9_HDRSZ + 4, 1052 clnt->msize - (P9_HDRSZ + 4), 1053 NULL); 1054 1055 kfree(cache_name); 1056 return clnt; 1057 1058 close_trans: 1059 clnt->trans_mod->close(clnt); 1060 put_trans: 1061 v9fs_put_trans(clnt->trans_mod); 1062 free_client: 1063 kfree(clnt); 1064 return ERR_PTR(err); 1065 } 1066 EXPORT_SYMBOL(p9_client_create); 1067 1068 void p9_client_destroy(struct p9_client *clnt) 1069 { 1070 struct p9_fid *fid; 1071 int id; 1072 1073 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1074 1075 if (clnt->trans_mod) 1076 clnt->trans_mod->close(clnt); 1077 1078 v9fs_put_trans(clnt->trans_mod); 1079 1080 idr_for_each_entry(&clnt->fids, fid, id) { 1081 pr_info("Found fid %d not clunked\n", fid->fid); 1082 p9_fid_destroy(fid); 1083 } 1084 1085 p9_tag_cleanup(clnt); 1086 1087 kmem_cache_destroy(clnt->fcall_cache); 1088 kfree(clnt); 1089 } 1090 EXPORT_SYMBOL(p9_client_destroy); 1091 1092 void p9_client_disconnect(struct p9_client *clnt) 1093 { 1094 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1095 clnt->status = Disconnected; 1096 } 1097 EXPORT_SYMBOL(p9_client_disconnect); 1098 1099 void p9_client_begin_disconnect(struct p9_client *clnt) 1100 { 1101 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1102 clnt->status = BeginDisconnect; 1103 } 1104 EXPORT_SYMBOL(p9_client_begin_disconnect); 1105 1106 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1107 const char *uname, kuid_t n_uname, 1108 const char *aname) 1109 { 1110 int err; 1111 struct p9_req_t *req; 1112 struct p9_fid *fid; 1113 struct p9_qid qid; 1114 1115 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1116 afid ? afid->fid : -1, uname, aname); 1117 fid = p9_fid_create(clnt); 1118 if (!fid) { 1119 err = -ENOMEM; 1120 goto error; 1121 } 1122 fid->uid = n_uname; 1123 1124 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1125 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1126 if (IS_ERR(req)) { 1127 err = PTR_ERR(req); 1128 goto error; 1129 } 1130 1131 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); 1132 if (err) { 1133 trace_9p_protocol_dump(clnt, &req->rc); 1134 p9_req_put(clnt, req); 1135 goto error; 1136 } 1137 1138 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1139 qid.type, qid.path, qid.version); 1140 1141 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1142 1143 p9_req_put(clnt, req); 1144 return fid; 1145 1146 error: 1147 if (fid) 1148 p9_fid_destroy(fid); 1149 return ERR_PTR(err); 1150 } 1151 EXPORT_SYMBOL(p9_client_attach); 1152 1153 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1154 const unsigned char * const *wnames, int clone) 1155 { 1156 int err; 1157 struct p9_client *clnt; 1158 struct p9_fid *fid; 1159 struct p9_qid *wqids; 1160 struct p9_req_t *req; 1161 u16 nwqids, count; 1162 1163 wqids = NULL; 1164 clnt = oldfid->clnt; 1165 if (clone) { 1166 fid = p9_fid_create(clnt); 1167 if (!fid) { 1168 err = -ENOMEM; 1169 goto error; 1170 } 1171 1172 fid->uid = oldfid->uid; 1173 } else { 1174 fid = oldfid; 1175 } 1176 1177 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1178 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1179 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1180 nwname, wnames); 1181 if (IS_ERR(req)) { 1182 err = PTR_ERR(req); 1183 goto error; 1184 } 1185 1186 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1187 if (err) { 1188 trace_9p_protocol_dump(clnt, &req->rc); 1189 p9_req_put(clnt, req); 1190 goto clunk_fid; 1191 } 1192 p9_req_put(clnt, req); 1193 1194 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1195 1196 if (nwqids != nwname) { 1197 err = -ENOENT; 1198 goto clunk_fid; 1199 } 1200 1201 for (count = 0; count < nwqids; count++) 1202 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1203 count, wqids[count].type, 1204 wqids[count].path, 1205 wqids[count].version); 1206 1207 if (nwname) 1208 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1209 else 1210 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); 1211 1212 kfree(wqids); 1213 return fid; 1214 1215 clunk_fid: 1216 kfree(wqids); 1217 p9_fid_put(fid); 1218 fid = NULL; 1219 1220 error: 1221 if (fid && fid != oldfid) 1222 p9_fid_destroy(fid); 1223 1224 return ERR_PTR(err); 1225 } 1226 EXPORT_SYMBOL(p9_client_walk); 1227 1228 int p9_client_open(struct p9_fid *fid, int mode) 1229 { 1230 int err; 1231 struct p9_client *clnt; 1232 struct p9_req_t *req; 1233 struct p9_qid qid; 1234 int iounit; 1235 1236 clnt = fid->clnt; 1237 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1238 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1239 1240 if (fid->mode != -1) 1241 return -EINVAL; 1242 1243 if (p9_is_proto_dotl(clnt)) 1244 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode & P9L_MODE_MASK); 1245 else 1246 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode & P9L_MODE_MASK); 1247 if (IS_ERR(req)) { 1248 err = PTR_ERR(req); 1249 goto error; 1250 } 1251 1252 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1253 if (err) { 1254 trace_9p_protocol_dump(clnt, &req->rc); 1255 goto free_and_error; 1256 } 1257 1258 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1259 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1260 qid.path, qid.version, iounit); 1261 1262 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1263 fid->mode = mode; 1264 fid->iounit = iounit; 1265 1266 free_and_error: 1267 p9_req_put(clnt, req); 1268 error: 1269 return err; 1270 } 1271 EXPORT_SYMBOL(p9_client_open); 1272 1273 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, 1274 u32 mode, kgid_t gid, struct p9_qid *qid) 1275 { 1276 int err; 1277 struct p9_client *clnt; 1278 struct p9_req_t *req; 1279 int iounit; 1280 1281 p9_debug(P9_DEBUG_9P, 1282 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1283 ofid->fid, name, flags, mode, 1284 from_kgid(&init_user_ns, gid)); 1285 clnt = ofid->clnt; 1286 1287 if (ofid->mode != -1) 1288 return -EINVAL; 1289 1290 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1291 mode & P9L_MODE_MASK, gid); 1292 if (IS_ERR(req)) { 1293 err = PTR_ERR(req); 1294 goto error; 1295 } 1296 1297 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); 1298 if (err) { 1299 trace_9p_protocol_dump(clnt, &req->rc); 1300 goto free_and_error; 1301 } 1302 1303 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1304 qid->type, qid->path, qid->version, iounit); 1305 1306 memmove(&ofid->qid, qid, sizeof(struct p9_qid)); 1307 ofid->mode = flags; 1308 ofid->iounit = iounit; 1309 1310 free_and_error: 1311 p9_req_put(clnt, req); 1312 error: 1313 return err; 1314 } 1315 EXPORT_SYMBOL(p9_client_create_dotl); 1316 1317 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1318 char *extension) 1319 { 1320 int err; 1321 struct p9_client *clnt; 1322 struct p9_req_t *req; 1323 struct p9_qid qid; 1324 int iounit; 1325 1326 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1327 fid->fid, name, perm, mode); 1328 clnt = fid->clnt; 1329 1330 if (fid->mode != -1) 1331 return -EINVAL; 1332 1333 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1334 mode & P9L_MODE_MASK, extension); 1335 if (IS_ERR(req)) { 1336 err = PTR_ERR(req); 1337 goto error; 1338 } 1339 1340 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1341 if (err) { 1342 trace_9p_protocol_dump(clnt, &req->rc); 1343 goto free_and_error; 1344 } 1345 1346 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1347 qid.type, qid.path, qid.version, iounit); 1348 1349 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1350 fid->mode = mode; 1351 fid->iounit = iounit; 1352 1353 free_and_error: 1354 p9_req_put(clnt, req); 1355 error: 1356 return err; 1357 } 1358 EXPORT_SYMBOL(p9_client_fcreate); 1359 1360 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1361 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1362 { 1363 int err; 1364 struct p9_client *clnt; 1365 struct p9_req_t *req; 1366 1367 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1368 dfid->fid, name, symtgt); 1369 clnt = dfid->clnt; 1370 1371 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1372 gid); 1373 if (IS_ERR(req)) { 1374 err = PTR_ERR(req); 1375 goto error; 1376 } 1377 1378 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 1379 if (err) { 1380 trace_9p_protocol_dump(clnt, &req->rc); 1381 goto free_and_error; 1382 } 1383 1384 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1385 qid->type, qid->path, qid->version); 1386 1387 free_and_error: 1388 p9_req_put(clnt, req); 1389 error: 1390 return err; 1391 } 1392 EXPORT_SYMBOL(p9_client_symlink); 1393 1394 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1395 { 1396 struct p9_client *clnt; 1397 struct p9_req_t *req; 1398 1399 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1400 dfid->fid, oldfid->fid, newname); 1401 clnt = dfid->clnt; 1402 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1403 newname); 1404 if (IS_ERR(req)) 1405 return PTR_ERR(req); 1406 1407 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1408 p9_req_put(clnt, req); 1409 return 0; 1410 } 1411 EXPORT_SYMBOL(p9_client_link); 1412 1413 int p9_client_fsync(struct p9_fid *fid, int datasync) 1414 { 1415 int err = 0; 1416 struct p9_client *clnt; 1417 struct p9_req_t *req; 1418 1419 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1420 fid->fid, datasync); 1421 clnt = fid->clnt; 1422 1423 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1424 if (IS_ERR(req)) { 1425 err = PTR_ERR(req); 1426 goto error; 1427 } 1428 1429 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1430 1431 p9_req_put(clnt, req); 1432 1433 error: 1434 return err; 1435 } 1436 EXPORT_SYMBOL(p9_client_fsync); 1437 1438 int p9_client_clunk(struct p9_fid *fid) 1439 { 1440 int err = 0; 1441 struct p9_client *clnt; 1442 struct p9_req_t *req; 1443 int retries = 0; 1444 1445 again: 1446 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", 1447 fid->fid, retries); 1448 clnt = fid->clnt; 1449 1450 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1451 if (IS_ERR(req)) { 1452 err = PTR_ERR(req); 1453 goto error; 1454 } 1455 1456 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1457 1458 p9_req_put(clnt, req); 1459 error: 1460 /* Fid is not valid even after a failed clunk 1461 * If interrupted, retry once then give up and 1462 * leak fid until umount. 1463 */ 1464 if (err == -ERESTARTSYS) { 1465 if (retries++ == 0) 1466 goto again; 1467 } else { 1468 p9_fid_destroy(fid); 1469 } 1470 return err; 1471 } 1472 EXPORT_SYMBOL(p9_client_clunk); 1473 1474 int p9_client_remove(struct p9_fid *fid) 1475 { 1476 int err = 0; 1477 struct p9_client *clnt; 1478 struct p9_req_t *req; 1479 1480 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1481 clnt = fid->clnt; 1482 1483 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1484 if (IS_ERR(req)) { 1485 err = PTR_ERR(req); 1486 goto error; 1487 } 1488 1489 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1490 1491 p9_req_put(clnt, req); 1492 error: 1493 if (err == -ERESTARTSYS) 1494 p9_fid_put(fid); 1495 else 1496 p9_fid_destroy(fid); 1497 return err; 1498 } 1499 EXPORT_SYMBOL(p9_client_remove); 1500 1501 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1502 { 1503 int err = 0; 1504 struct p9_req_t *req; 1505 struct p9_client *clnt; 1506 1507 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1508 dfid->fid, name, flags); 1509 1510 clnt = dfid->clnt; 1511 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1512 if (IS_ERR(req)) { 1513 err = PTR_ERR(req); 1514 goto error; 1515 } 1516 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1517 1518 p9_req_put(clnt, req); 1519 error: 1520 return err; 1521 } 1522 EXPORT_SYMBOL(p9_client_unlinkat); 1523 1524 int 1525 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1526 { 1527 int total = 0; 1528 *err = 0; 1529 1530 while (iov_iter_count(to)) { 1531 int count; 1532 1533 count = p9_client_read_once(fid, offset, to, err); 1534 if (!count || *err) 1535 break; 1536 offset += count; 1537 total += count; 1538 } 1539 return total; 1540 } 1541 EXPORT_SYMBOL(p9_client_read); 1542 1543 int 1544 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, 1545 int *err) 1546 { 1547 struct p9_client *clnt = fid->clnt; 1548 struct p9_req_t *req; 1549 int count = iov_iter_count(to); 1550 int rsize, received, non_zc = 0; 1551 char *dataptr; 1552 1553 *err = 0; 1554 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n", 1555 fid->fid, offset, iov_iter_count(to)); 1556 1557 rsize = fid->iounit; 1558 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1559 rsize = clnt->msize - P9_IOHDRSZ; 1560 1561 if (count < rsize) 1562 rsize = count; 1563 1564 /* Don't bother zerocopy for small IO (< 1024) */ 1565 if (clnt->trans_mod->zc_request && rsize > 1024) { 1566 /* response header len is 11 1567 * PDU Header(7) + IO Size (4) 1568 */ 1569 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1570 0, 11, "dqd", fid->fid, 1571 offset, rsize); 1572 } else { 1573 non_zc = 1; 1574 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1575 rsize); 1576 } 1577 if (IS_ERR(req)) { 1578 *err = PTR_ERR(req); 1579 if (!non_zc) 1580 iov_iter_revert(to, count - iov_iter_count(to)); 1581 return 0; 1582 } 1583 1584 *err = p9pdu_readf(&req->rc, clnt->proto_version, 1585 "D", &received, &dataptr); 1586 if (*err) { 1587 if (!non_zc) 1588 iov_iter_revert(to, count - iov_iter_count(to)); 1589 trace_9p_protocol_dump(clnt, &req->rc); 1590 p9_req_put(clnt, req); 1591 return 0; 1592 } 1593 if (rsize < received) { 1594 pr_err("bogus RREAD count (%d > %d)\n", received, rsize); 1595 received = rsize; 1596 } 1597 1598 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", received); 1599 1600 if (non_zc) { 1601 int n = copy_to_iter(dataptr, received, to); 1602 1603 if (n != received) { 1604 *err = -EFAULT; 1605 p9_req_put(clnt, req); 1606 return n; 1607 } 1608 } else { 1609 iov_iter_revert(to, count - received - iov_iter_count(to)); 1610 } 1611 p9_req_put(clnt, req); 1612 return received; 1613 } 1614 EXPORT_SYMBOL(p9_client_read_once); 1615 1616 int 1617 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1618 { 1619 struct p9_client *clnt = fid->clnt; 1620 struct p9_req_t *req; 1621 int total = 0; 1622 *err = 0; 1623 1624 while (iov_iter_count(from)) { 1625 int count = iov_iter_count(from); 1626 int rsize = fid->iounit; 1627 int written; 1628 1629 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1630 rsize = clnt->msize - P9_IOHDRSZ; 1631 1632 if (count < rsize) 1633 rsize = count; 1634 1635 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d (/%d)\n", 1636 fid->fid, offset, rsize, count); 1637 1638 /* Don't bother zerocopy for small IO (< 1024) */ 1639 if (clnt->trans_mod->zc_request && rsize > 1024) { 1640 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1641 rsize, P9_ZC_HDR_SZ, "dqd", 1642 fid->fid, offset, rsize); 1643 } else { 1644 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1645 offset, rsize, from); 1646 } 1647 if (IS_ERR(req)) { 1648 iov_iter_revert(from, count - iov_iter_count(from)); 1649 *err = PTR_ERR(req); 1650 break; 1651 } 1652 1653 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written); 1654 if (*err) { 1655 iov_iter_revert(from, count - iov_iter_count(from)); 1656 trace_9p_protocol_dump(clnt, &req->rc); 1657 p9_req_put(clnt, req); 1658 break; 1659 } 1660 if (rsize < written) { 1661 pr_err("bogus RWRITE count (%d > %d)\n", written, rsize); 1662 written = rsize; 1663 } 1664 1665 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", written); 1666 1667 p9_req_put(clnt, req); 1668 iov_iter_revert(from, count - written - iov_iter_count(from)); 1669 total += written; 1670 offset += written; 1671 } 1672 return total; 1673 } 1674 EXPORT_SYMBOL(p9_client_write); 1675 1676 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1677 { 1678 int err; 1679 struct p9_client *clnt; 1680 struct p9_wstat *ret; 1681 struct p9_req_t *req; 1682 u16 ignored; 1683 1684 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1685 1686 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1687 if (!ret) 1688 return ERR_PTR(-ENOMEM); 1689 1690 clnt = fid->clnt; 1691 1692 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1693 if (IS_ERR(req)) { 1694 err = PTR_ERR(req); 1695 goto error; 1696 } 1697 1698 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); 1699 if (err) { 1700 trace_9p_protocol_dump(clnt, &req->rc); 1701 p9_req_put(clnt, req); 1702 goto error; 1703 } 1704 1705 p9_debug(P9_DEBUG_9P, 1706 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1707 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1708 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1709 "<<< uid=%d gid=%d n_muid=%d\n", 1710 ret->size, ret->type, ret->dev, ret->qid.type, ret->qid.path, 1711 ret->qid.version, ret->mode, 1712 ret->atime, ret->mtime, ret->length, 1713 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1714 from_kuid(&init_user_ns, ret->n_uid), 1715 from_kgid(&init_user_ns, ret->n_gid), 1716 from_kuid(&init_user_ns, ret->n_muid)); 1717 1718 p9_req_put(clnt, req); 1719 return ret; 1720 1721 error: 1722 kfree(ret); 1723 return ERR_PTR(err); 1724 } 1725 EXPORT_SYMBOL(p9_client_stat); 1726 1727 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1728 u64 request_mask) 1729 { 1730 int err; 1731 struct p9_client *clnt; 1732 struct p9_stat_dotl *ret; 1733 struct p9_req_t *req; 1734 1735 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1736 fid->fid, request_mask); 1737 1738 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1739 if (!ret) 1740 return ERR_PTR(-ENOMEM); 1741 1742 clnt = fid->clnt; 1743 1744 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1745 if (IS_ERR(req)) { 1746 err = PTR_ERR(req); 1747 goto error; 1748 } 1749 1750 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); 1751 if (err) { 1752 trace_9p_protocol_dump(clnt, &req->rc); 1753 p9_req_put(clnt, req); 1754 goto error; 1755 } 1756 1757 p9_debug(P9_DEBUG_9P, "<<< RGETATTR st_result_mask=%lld\n" 1758 "<<< qid=%x.%llx.%x\n" 1759 "<<< st_mode=%8.8x st_nlink=%llu\n" 1760 "<<< st_uid=%d st_gid=%d\n" 1761 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1762 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1763 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1764 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1765 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1766 "<<< st_gen=%lld st_data_version=%lld\n", 1767 ret->st_result_mask, 1768 ret->qid.type, ret->qid.path, ret->qid.version, 1769 ret->st_mode, ret->st_nlink, 1770 from_kuid(&init_user_ns, ret->st_uid), 1771 from_kgid(&init_user_ns, ret->st_gid), 1772 ret->st_rdev, ret->st_size, ret->st_blksize, ret->st_blocks, 1773 ret->st_atime_sec, ret->st_atime_nsec, 1774 ret->st_mtime_sec, ret->st_mtime_nsec, 1775 ret->st_ctime_sec, ret->st_ctime_nsec, 1776 ret->st_btime_sec, ret->st_btime_nsec, 1777 ret->st_gen, ret->st_data_version); 1778 1779 p9_req_put(clnt, req); 1780 return ret; 1781 1782 error: 1783 kfree(ret); 1784 return ERR_PTR(err); 1785 } 1786 EXPORT_SYMBOL(p9_client_getattr_dotl); 1787 1788 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1789 { 1790 int ret; 1791 1792 /* NOTE: size shouldn't include its own length */ 1793 /* size[2] type[2] dev[4] qid[13] */ 1794 /* mode[4] atime[4] mtime[4] length[8]*/ 1795 /* name[s] uid[s] gid[s] muid[s] */ 1796 ret = 2 + 4 + 13 + 4 + 4 + 4 + 8 + 2 + 2 + 2 + 2; 1797 1798 if (wst->name) 1799 ret += strlen(wst->name); 1800 if (wst->uid) 1801 ret += strlen(wst->uid); 1802 if (wst->gid) 1803 ret += strlen(wst->gid); 1804 if (wst->muid) 1805 ret += strlen(wst->muid); 1806 1807 if (proto_version == p9_proto_2000u || 1808 proto_version == p9_proto_2000L) { 1809 /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1810 ret += 2 + 4 + 4 + 4; 1811 if (wst->extension) 1812 ret += strlen(wst->extension); 1813 } 1814 1815 return ret; 1816 } 1817 1818 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1819 { 1820 int err = 0; 1821 struct p9_req_t *req; 1822 struct p9_client *clnt; 1823 1824 clnt = fid->clnt; 1825 wst->size = p9_client_statsize(wst, clnt->proto_version); 1826 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", 1827 fid->fid); 1828 p9_debug(P9_DEBUG_9P, 1829 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1830 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1831 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1832 " uid=%d gid=%d n_muid=%d\n", 1833 wst->size, wst->type, wst->dev, wst->qid.type, 1834 wst->qid.path, wst->qid.version, 1835 wst->mode, wst->atime, wst->mtime, wst->length, 1836 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1837 from_kuid(&init_user_ns, wst->n_uid), 1838 from_kgid(&init_user_ns, wst->n_gid), 1839 from_kuid(&init_user_ns, wst->n_muid)); 1840 1841 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", 1842 fid->fid, wst->size + 2, wst); 1843 if (IS_ERR(req)) { 1844 err = PTR_ERR(req); 1845 goto error; 1846 } 1847 1848 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1849 1850 p9_req_put(clnt, req); 1851 error: 1852 return err; 1853 } 1854 EXPORT_SYMBOL(p9_client_wstat); 1855 1856 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1857 { 1858 int err = 0; 1859 struct p9_req_t *req; 1860 struct p9_client *clnt; 1861 1862 clnt = fid->clnt; 1863 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1864 p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n", 1865 p9attr->valid, p9attr->mode, 1866 from_kuid(&init_user_ns, p9attr->uid), 1867 from_kgid(&init_user_ns, p9attr->gid), 1868 p9attr->size); 1869 p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n", 1870 p9attr->atime_sec, p9attr->atime_nsec); 1871 p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n", 1872 p9attr->mtime_sec, p9attr->mtime_nsec); 1873 1874 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1875 1876 if (IS_ERR(req)) { 1877 err = PTR_ERR(req); 1878 goto error; 1879 } 1880 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1881 p9_req_put(clnt, req); 1882 error: 1883 return err; 1884 } 1885 EXPORT_SYMBOL(p9_client_setattr); 1886 1887 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1888 { 1889 int err; 1890 struct p9_req_t *req; 1891 struct p9_client *clnt; 1892 1893 clnt = fid->clnt; 1894 1895 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1896 1897 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1898 if (IS_ERR(req)) { 1899 err = PTR_ERR(req); 1900 goto error; 1901 } 1902 1903 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1904 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1905 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1906 if (err) { 1907 trace_9p_protocol_dump(clnt, &req->rc); 1908 p9_req_put(clnt, req); 1909 goto error; 1910 } 1911 1912 p9_debug(P9_DEBUG_9P, 1913 "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n", 1914 fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree, 1915 sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen); 1916 1917 p9_req_put(clnt, req); 1918 error: 1919 return err; 1920 } 1921 EXPORT_SYMBOL(p9_client_statfs); 1922 1923 int p9_client_rename(struct p9_fid *fid, 1924 struct p9_fid *newdirfid, const char *name) 1925 { 1926 int err = 0; 1927 struct p9_req_t *req; 1928 struct p9_client *clnt; 1929 1930 clnt = fid->clnt; 1931 1932 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1933 fid->fid, newdirfid->fid, name); 1934 1935 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1936 newdirfid->fid, name); 1937 if (IS_ERR(req)) { 1938 err = PTR_ERR(req); 1939 goto error; 1940 } 1941 1942 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1943 1944 p9_req_put(clnt, req); 1945 error: 1946 return err; 1947 } 1948 EXPORT_SYMBOL(p9_client_rename); 1949 1950 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1951 struct p9_fid *newdirfid, const char *new_name) 1952 { 1953 int err = 0; 1954 struct p9_req_t *req; 1955 struct p9_client *clnt; 1956 1957 clnt = olddirfid->clnt; 1958 1959 p9_debug(P9_DEBUG_9P, 1960 ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n", 1961 olddirfid->fid, old_name, newdirfid->fid, new_name); 1962 1963 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1964 old_name, newdirfid->fid, new_name); 1965 if (IS_ERR(req)) { 1966 err = PTR_ERR(req); 1967 goto error; 1968 } 1969 1970 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1971 newdirfid->fid, new_name); 1972 1973 p9_req_put(clnt, req); 1974 error: 1975 return err; 1976 } 1977 EXPORT_SYMBOL(p9_client_renameat); 1978 1979 /* An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1980 */ 1981 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1982 const char *attr_name, u64 *attr_size) 1983 { 1984 int err; 1985 struct p9_req_t *req; 1986 struct p9_client *clnt; 1987 struct p9_fid *attr_fid; 1988 1989 clnt = file_fid->clnt; 1990 attr_fid = p9_fid_create(clnt); 1991 if (!attr_fid) { 1992 err = -ENOMEM; 1993 goto error; 1994 } 1995 p9_debug(P9_DEBUG_9P, 1996 ">>> TXATTRWALK file_fid %d, attr_fid %d name '%s'\n", 1997 file_fid->fid, attr_fid->fid, attr_name); 1998 1999 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 2000 file_fid->fid, attr_fid->fid, attr_name); 2001 if (IS_ERR(req)) { 2002 err = PTR_ERR(req); 2003 goto error; 2004 } 2005 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); 2006 if (err) { 2007 trace_9p_protocol_dump(clnt, &req->rc); 2008 p9_req_put(clnt, req); 2009 goto clunk_fid; 2010 } 2011 p9_req_put(clnt, req); 2012 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2013 attr_fid->fid, *attr_size); 2014 return attr_fid; 2015 clunk_fid: 2016 p9_fid_put(attr_fid); 2017 attr_fid = NULL; 2018 error: 2019 if (attr_fid && attr_fid != file_fid) 2020 p9_fid_destroy(attr_fid); 2021 2022 return ERR_PTR(err); 2023 } 2024 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2025 2026 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2027 u64 attr_size, int flags) 2028 { 2029 int err = 0; 2030 struct p9_req_t *req; 2031 struct p9_client *clnt; 2032 2033 p9_debug(P9_DEBUG_9P, 2034 ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n", 2035 fid->fid, name, attr_size, flags); 2036 clnt = fid->clnt; 2037 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2038 fid->fid, name, attr_size, flags); 2039 if (IS_ERR(req)) { 2040 err = PTR_ERR(req); 2041 goto error; 2042 } 2043 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2044 p9_req_put(clnt, req); 2045 error: 2046 return err; 2047 } 2048 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2049 2050 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2051 { 2052 int err, rsize, non_zc = 0; 2053 struct p9_client *clnt; 2054 struct p9_req_t *req; 2055 char *dataptr; 2056 struct kvec kv = {.iov_base = data, .iov_len = count}; 2057 struct iov_iter to; 2058 2059 iov_iter_kvec(&to, ITER_DEST, &kv, 1, count); 2060 2061 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2062 fid->fid, offset, count); 2063 2064 clnt = fid->clnt; 2065 2066 rsize = fid->iounit; 2067 if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ) 2068 rsize = clnt->msize - P9_READDIRHDRSZ; 2069 2070 if (count < rsize) 2071 rsize = count; 2072 2073 /* Don't bother zerocopy for small IO (< 1024) */ 2074 if (clnt->trans_mod->zc_request && rsize > 1024) { 2075 /* response header len is 11 2076 * PDU Header(7) + IO Size (4) 2077 */ 2078 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2079 11, "dqd", fid->fid, offset, rsize); 2080 } else { 2081 non_zc = 1; 2082 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2083 offset, rsize); 2084 } 2085 if (IS_ERR(req)) { 2086 err = PTR_ERR(req); 2087 goto error; 2088 } 2089 2090 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); 2091 if (err) { 2092 trace_9p_protocol_dump(clnt, &req->rc); 2093 goto free_and_error; 2094 } 2095 if (rsize < count) { 2096 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2097 count = rsize; 2098 } 2099 2100 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2101 2102 if (non_zc) 2103 memmove(data, dataptr, count); 2104 2105 p9_req_put(clnt, req); 2106 return count; 2107 2108 free_and_error: 2109 p9_req_put(clnt, req); 2110 error: 2111 return err; 2112 } 2113 EXPORT_SYMBOL(p9_client_readdir); 2114 2115 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2116 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2117 { 2118 int err; 2119 struct p9_client *clnt; 2120 struct p9_req_t *req; 2121 2122 clnt = fid->clnt; 2123 p9_debug(P9_DEBUG_9P, 2124 ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n", 2125 fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2126 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2127 MAJOR(rdev), MINOR(rdev), gid); 2128 if (IS_ERR(req)) 2129 return PTR_ERR(req); 2130 2131 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2132 if (err) { 2133 trace_9p_protocol_dump(clnt, &req->rc); 2134 goto error; 2135 } 2136 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", 2137 qid->type, qid->path, qid->version); 2138 2139 error: 2140 p9_req_put(clnt, req); 2141 return err; 2142 } 2143 EXPORT_SYMBOL(p9_client_mknod_dotl); 2144 2145 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2146 kgid_t gid, struct p9_qid *qid) 2147 { 2148 int err; 2149 struct p9_client *clnt; 2150 struct p9_req_t *req; 2151 2152 clnt = fid->clnt; 2153 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2154 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2155 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", 2156 fid->fid, name, mode, gid); 2157 if (IS_ERR(req)) 2158 return PTR_ERR(req); 2159 2160 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2161 if (err) { 2162 trace_9p_protocol_dump(clnt, &req->rc); 2163 goto error; 2164 } 2165 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2166 qid->path, qid->version); 2167 2168 error: 2169 p9_req_put(clnt, req); 2170 return err; 2171 } 2172 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2173 2174 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2175 { 2176 int err; 2177 struct p9_client *clnt; 2178 struct p9_req_t *req; 2179 2180 clnt = fid->clnt; 2181 p9_debug(P9_DEBUG_9P, 2182 ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n", 2183 fid->fid, flock->type, flock->flags, flock->start, 2184 flock->length, flock->proc_id, flock->client_id); 2185 2186 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2187 flock->flags, flock->start, flock->length, 2188 flock->proc_id, flock->client_id); 2189 2190 if (IS_ERR(req)) 2191 return PTR_ERR(req); 2192 2193 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); 2194 if (err) { 2195 trace_9p_protocol_dump(clnt, &req->rc); 2196 goto error; 2197 } 2198 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2199 error: 2200 p9_req_put(clnt, req); 2201 return err; 2202 } 2203 EXPORT_SYMBOL(p9_client_lock_dotl); 2204 2205 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2206 { 2207 int err; 2208 struct p9_client *clnt; 2209 struct p9_req_t *req; 2210 2211 clnt = fid->clnt; 2212 p9_debug(P9_DEBUG_9P, 2213 ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n", 2214 fid->fid, glock->type, glock->start, glock->length, 2215 glock->proc_id, glock->client_id); 2216 2217 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, 2218 glock->type, glock->start, glock->length, 2219 glock->proc_id, glock->client_id); 2220 2221 if (IS_ERR(req)) 2222 return PTR_ERR(req); 2223 2224 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, 2225 &glock->start, &glock->length, &glock->proc_id, 2226 &glock->client_id); 2227 if (err) { 2228 trace_9p_protocol_dump(clnt, &req->rc); 2229 goto error; 2230 } 2231 p9_debug(P9_DEBUG_9P, 2232 "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n", 2233 glock->type, glock->start, glock->length, 2234 glock->proc_id, glock->client_id); 2235 error: 2236 p9_req_put(clnt, req); 2237 return err; 2238 } 2239 EXPORT_SYMBOL(p9_client_getlock_dotl); 2240 2241 int p9_client_readlink(struct p9_fid *fid, char **target) 2242 { 2243 int err; 2244 struct p9_client *clnt; 2245 struct p9_req_t *req; 2246 2247 clnt = fid->clnt; 2248 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2249 2250 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2251 if (IS_ERR(req)) 2252 return PTR_ERR(req); 2253 2254 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); 2255 if (err) { 2256 trace_9p_protocol_dump(clnt, &req->rc); 2257 goto error; 2258 } 2259 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2260 error: 2261 p9_req_put(clnt, req); 2262 return err; 2263 } 2264 EXPORT_SYMBOL(p9_client_readlink); 2265 2266 int __init p9_client_init(void) 2267 { 2268 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); 2269 return p9_req_cache ? 0 : -ENOMEM; 2270 } 2271 2272 void __exit p9_client_exit(void) 2273 { 2274 kmem_cache_destroy(p9_req_cache); 2275 } 2276