1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * net/9p/clnt.c 4 * 5 * 9P Client 6 * 7 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> 8 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net> 9 */ 10 11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 12 13#include <linux/module.h> 14#include <linux/errno.h> 15#include <linux/fs.h> 16#include <linux/poll.h> 17#include <linux/idr.h> 18#include <linux/mutex.h> 19#include <linux/slab.h> 20#include <linux/sched/signal.h> 21#include <linux/uaccess.h> 22#include <linux/uio.h> 23#include <net/9p/9p.h> 24#include <linux/parser.h> 25#include <linux/seq_file.h> 26#include <net/9p/client.h> 27#include <net/9p/transport.h> 28#include "protocol.h" 29 30#define CREATE_TRACE_POINTS 31#include <trace/events/9p.h> 32 33/* 34 * Client Option Parsing (code inspired by NFS code) 35 * - a little lazy - parse all client options 36 */ 37 38enum { 39 Opt_msize, 40 Opt_trans, 41 Opt_legacy, 42 Opt_version, 43 Opt_err, 44}; 45 46static const match_table_t tokens = { 47 {Opt_msize, "msize=%u"}, 48 {Opt_legacy, "noextend"}, 49 {Opt_trans, "trans=%s"}, 50 {Opt_version, "version=%s"}, 51 {Opt_err, NULL}, 52}; 53 54inline int p9_is_proto_dotl(struct p9_client *clnt) 55{ 56 return clnt->proto_version == p9_proto_2000L; 57} 58EXPORT_SYMBOL(p9_is_proto_dotl); 59 60inline int p9_is_proto_dotu(struct p9_client *clnt) 61{ 62 return clnt->proto_version == p9_proto_2000u; 63} 64EXPORT_SYMBOL(p9_is_proto_dotu); 65 66int p9_show_client_options(struct seq_file *m, struct p9_client *clnt) 67{ 68 if (clnt->msize != 8192) 69 seq_printf(m, ",msize=%u", clnt->msize); 70 seq_printf(m, ",trans=%s", clnt->trans_mod->name); 71 72 switch (clnt->proto_version) { 73 case p9_proto_legacy: 74 seq_puts(m, ",noextend"); 75 break; 76 case p9_proto_2000u: 77 seq_puts(m, ",version=9p2000.u"); 78 break; 79 case p9_proto_2000L: 80 /* Default */ 81 break; 82 } 83 84 if (clnt->trans_mod->show_options) 85 return clnt->trans_mod->show_options(m, clnt); 86 return 0; 87} 88EXPORT_SYMBOL(p9_show_client_options); 89 90/* 91 * Some error codes are taken directly from the server replies, 92 * make sure they are valid. 93 */ 94static int safe_errno(int err) 95{ 96 if ((err > 0) || (err < -MAX_ERRNO)) { 97 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err); 98 return -EPROTO; 99 } 100 return err; 101} 102 103 104/* Interpret mount option for protocol version */ 105static int get_protocol_version(char *s) 106{ 107 int version = -EINVAL; 108 109 if (!strcmp(s, "9p2000")) { 110 version = p9_proto_legacy; 111 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n"); 112 } else if (!strcmp(s, "9p2000.u")) { 113 version = p9_proto_2000u; 114 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); 115 } else if (!strcmp(s, "9p2000.L")) { 116 version = p9_proto_2000L; 117 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); 118 } else 119 pr_info("Unknown protocol version %s\n", s); 120 121 return version; 122} 123 124/** 125 * parse_options - parse mount options into client structure 126 * @opts: options string passed from mount 127 * @clnt: existing v9fs client information 128 * 129 * Return 0 upon success, -ERRNO upon failure 130 */ 131 132static int parse_opts(char *opts, struct p9_client *clnt) 133{ 134 char *options, *tmp_options; 135 char *p; 136 substring_t args[MAX_OPT_ARGS]; 137 int option; 138 char *s; 139 int ret = 0; 140 141 clnt->proto_version = p9_proto_2000L; 142 clnt->msize = 8192; 143 144 if (!opts) 145 return 0; 146 147 tmp_options = kstrdup(opts, GFP_KERNEL); 148 if (!tmp_options) { 149 p9_debug(P9_DEBUG_ERROR, 150 "failed to allocate copy of option string\n"); 151 return -ENOMEM; 152 } 153 options = tmp_options; 154 155 while ((p = strsep(&options, ",")) != NULL) { 156 int token, r; 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 == NULL) { 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 218free_and_return: 219 if (ret) 220 v9fs_put_trans(clnt->trans_mod); 221 kfree(tmp_options); 222 return ret; 223} 224 225static 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 241void 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} 254EXPORT_SYMBOL(p9_fcall_fini); 255 256static struct kmem_cache *p9_req_cache; 257 258/** 259 * p9_req_alloc - Allocate a new request. 260 * @c: Client session. 261 * @type: Transaction type. 262 * @max_size: Maximum packet size for this request. 263 * 264 * Context: Process context. 265 * Return: Pointer to new request. 266 */ 267static struct p9_req_t * 268p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size) 269{ 270 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); 271 int alloc_msize = min(c->msize, max_size); 272 int tag; 273 274 if (!req) 275 return ERR_PTR(-ENOMEM); 276 277 if (p9_fcall_init(c, &req->tc, alloc_msize)) 278 goto free_req; 279 if (p9_fcall_init(c, &req->rc, alloc_msize)) 280 goto free; 281 282 p9pdu_reset(&req->tc); 283 p9pdu_reset(&req->rc); 284 req->t_err = 0; 285 req->status = REQ_STATUS_ALLOC; 286 init_waitqueue_head(&req->wq); 287 INIT_LIST_HEAD(&req->req_list); 288 289 idr_preload(GFP_NOFS); 290 spin_lock_irq(&c->lock); 291 if (type == P9_TVERSION) 292 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1, 293 GFP_NOWAIT); 294 else 295 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT); 296 req->tc.tag = tag; 297 spin_unlock_irq(&c->lock); 298 idr_preload_end(); 299 if (tag < 0) 300 goto free; 301 302 /* Init ref to two because in the general case there is one ref 303 * that is put asynchronously by a writer thread, one ref 304 * temporarily given by p9_tag_lookup and put by p9_client_cb 305 * in the recv thread, and one ref put by p9_tag_remove in the 306 * main thread. The only exception is virtio that does not use 307 * p9_tag_lookup but does not have a writer thread either 308 * (the write happens synchronously in the request/zc_request 309 * callback), so p9_client_cb eats the second ref there 310 * as the pointer is duplicated directly by virtqueue_add_sgs() 311 */ 312 refcount_set(&req->refcount.refcount, 2); 313 314 return req; 315 316free: 317 p9_fcall_fini(&req->tc); 318 p9_fcall_fini(&req->rc); 319free_req: 320 kmem_cache_free(p9_req_cache, req); 321 return ERR_PTR(-ENOMEM); 322} 323 324/** 325 * p9_tag_lookup - Look up a request by tag. 326 * @c: Client session. 327 * @tag: Transaction ID. 328 * 329 * Context: Any context. 330 * Return: A request, or %NULL if there is no request with that tag. 331 */ 332struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 333{ 334 struct p9_req_t *req; 335 336 rcu_read_lock(); 337again: 338 req = idr_find(&c->reqs, tag); 339 if (req) { 340 /* We have to be careful with the req found under rcu_read_lock 341 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the 342 * ref again without corrupting other data, then check again 343 * that the tag matches once we have the ref 344 */ 345 if (!p9_req_try_get(req)) 346 goto again; 347 if (req->tc.tag != tag) { 348 p9_req_put(req); 349 goto again; 350 } 351 } 352 rcu_read_unlock(); 353 354 return req; 355} 356EXPORT_SYMBOL(p9_tag_lookup); 357 358/** 359 * p9_tag_remove - Remove a tag. 360 * @c: Client session. 361 * @r: Request of reference. 362 * 363 * Context: Any context. 364 */ 365static int p9_tag_remove(struct p9_client *c, struct p9_req_t *r) 366{ 367 unsigned long flags; 368 u16 tag = r->tc.tag; 369 370 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); 371 spin_lock_irqsave(&c->lock, flags); 372 idr_remove(&c->reqs, tag); 373 spin_unlock_irqrestore(&c->lock, flags); 374 return p9_req_put(r); 375} 376 377static void p9_req_free(struct kref *ref) 378{ 379 struct p9_req_t *r = container_of(ref, struct p9_req_t, refcount); 380 p9_fcall_fini(&r->tc); 381 p9_fcall_fini(&r->rc); 382 kmem_cache_free(p9_req_cache, r); 383} 384 385int p9_req_put(struct p9_req_t *r) 386{ 387 return kref_put(&r->refcount, p9_req_free); 388} 389EXPORT_SYMBOL(p9_req_put); 390 391/** 392 * p9_tag_cleanup - cleans up tags structure and reclaims resources 393 * @c: v9fs client struct 394 * 395 * This frees resources associated with the tags structure 396 * 397 */ 398static void p9_tag_cleanup(struct p9_client *c) 399{ 400 struct p9_req_t *req; 401 int id; 402 403 rcu_read_lock(); 404 idr_for_each_entry(&c->reqs, req, id) { 405 pr_info("Tag %d still in use\n", id); 406 if (p9_tag_remove(c, req) == 0) 407 pr_warn("Packet with tag %d has still references", 408 req->tc.tag); 409 } 410 rcu_read_unlock(); 411} 412 413/** 414 * p9_client_cb - call back from transport to client 415 * c: client state 416 * req: request received 417 * 418 */ 419void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) 420{ 421 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); 422 423 /* 424 * This barrier is needed to make sure any change made to req before 425 * the status change is visible to another thread 426 */ 427 smp_wmb(); 428 req->status = status; 429 430 wake_up(&req->wq); 431 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); 432 p9_req_put(req); 433} 434EXPORT_SYMBOL(p9_client_cb); 435 436/** 437 * p9_parse_header - parse header arguments out of a packet 438 * @pdu: packet to parse 439 * @size: size of packet 440 * @type: type of request 441 * @tag: tag of packet 442 * @rewind: set if we need to rewind offset afterwards 443 */ 444 445int 446p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, 447 int rewind) 448{ 449 int8_t r_type; 450 int16_t r_tag; 451 int32_t r_size; 452 int offset = pdu->offset; 453 int err; 454 455 pdu->offset = 0; 456 457 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 458 if (err) 459 goto rewind_and_exit; 460 461 if (type) 462 *type = r_type; 463 if (tag) 464 *tag = r_tag; 465 if (size) 466 *size = r_size; 467 468 if (pdu->size != r_size || r_size < 7) { 469 err = -EINVAL; 470 goto rewind_and_exit; 471 } 472 473 pdu->id = r_type; 474 pdu->tag = r_tag; 475 476 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 477 pdu->size, pdu->id, pdu->tag); 478 479rewind_and_exit: 480 if (rewind) 481 pdu->offset = offset; 482 return err; 483} 484EXPORT_SYMBOL(p9_parse_header); 485 486/** 487 * p9_check_errors - check 9p packet for error return and process it 488 * @c: current client instance 489 * @req: request to parse and check for error conditions 490 * 491 * returns error code if one is discovered, otherwise returns 0 492 * 493 * this will have to be more complicated if we have multiple 494 * error packet types 495 */ 496 497static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 498{ 499 int8_t type; 500 int err; 501 int ecode; 502 503 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 504 if (req->rc.size >= c->msize) { 505 p9_debug(P9_DEBUG_ERROR, 506 "requested packet size too big: %d\n", 507 req->rc.size); 508 return -EIO; 509 } 510 /* 511 * dump the response from server 512 * This should be after check errors which poplulate pdu_fcall. 513 */ 514 trace_9p_protocol_dump(c, &req->rc); 515 if (err) { 516 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 517 return err; 518 } 519 if (type != P9_RERROR && type != P9_RLERROR) 520 return 0; 521 522 if (!p9_is_proto_dotl(c)) { 523 char *ename = NULL; 524 525 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 526 &ename, &ecode); 527 if (err) { 528 kfree(ename); 529 goto out_err; 530 } 531 532 if (p9_is_proto_dotu(c) && ecode < 512) 533 err = -ecode; 534 535 if (!err) { 536 err = p9_errstr2errno(ename, strlen(ename)); 537 538 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 539 -ecode, ename); 540 } 541 kfree(ename); 542 } else { 543 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 544 if (err) 545 goto out_err; 546 err = -ecode; 547 548 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 549 } 550 551 return err; 552 553out_err: 554 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 555 556 return err; 557} 558 559/** 560 * p9_check_zc_errors - check 9p packet for error return and process it 561 * @c: current client instance 562 * @req: request to parse and check for error conditions 563 * @in_hdrlen: Size of response protocol buffer. 564 * 565 * returns error code if one is discovered, otherwise returns 0 566 * 567 * this will have to be more complicated if we have multiple 568 * error packet types 569 */ 570 571static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req, 572 struct iov_iter *uidata, int in_hdrlen) 573{ 574 int err; 575 int ecode; 576 int8_t type; 577 char *ename = NULL; 578 579 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 580 /* 581 * dump the response from server 582 * This should be after parse_header which poplulate pdu_fcall. 583 */ 584 trace_9p_protocol_dump(c, &req->rc); 585 if (err) { 586 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 587 return err; 588 } 589 590 if (type != P9_RERROR && type != P9_RLERROR) 591 return 0; 592 593 if (!p9_is_proto_dotl(c)) { 594 /* Error is reported in string format */ 595 int len; 596 /* 7 = header size for RERROR; */ 597 int inline_len = in_hdrlen - 7; 598 599 len = req->rc.size - req->rc.offset; 600 if (len > (P9_ZC_HDR_SZ - 7)) { 601 err = -EFAULT; 602 goto out_err; 603 } 604 605 ename = &req->rc.sdata[req->rc.offset]; 606 if (len > inline_len) { 607 /* We have error in external buffer */ 608 if (!copy_from_iter_full(ename + inline_len, 609 len - inline_len, uidata)) { 610 err = -EFAULT; 611 goto out_err; 612 } 613 } 614 ename = NULL; 615 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 616 &ename, &ecode); 617 if (err) 618 goto out_err; 619 620 if (p9_is_proto_dotu(c) && ecode < 512) 621 err = -ecode; 622 623 if (!err) { 624 err = p9_errstr2errno(ename, strlen(ename)); 625 626 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 627 -ecode, ename); 628 } 629 kfree(ename); 630 } else { 631 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 632 err = -ecode; 633 634 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 635 } 636 return err; 637 638out_err: 639 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 640 return err; 641} 642 643static struct p9_req_t * 644p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 645 646/** 647 * p9_client_flush - flush (cancel) a request 648 * @c: client state 649 * @oldreq: request to cancel 650 * 651 * This sents a flush for a particular request and links 652 * the flush request to the original request. The current 653 * code only supports a single flush request although the protocol 654 * allows for multiple flush requests to be sent for a single request. 655 * 656 */ 657 658static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 659{ 660 struct p9_req_t *req; 661 int16_t oldtag; 662 int err; 663 664 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); 665 if (err) 666 return err; 667 668 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 669 670 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 671 if (IS_ERR(req)) 672 return PTR_ERR(req); 673 674 /* 675 * if we haven't received a response for oldreq, 676 * remove it from the list 677 */ 678 if (oldreq->status == REQ_STATUS_SENT) { 679 if (c->trans_mod->cancelled) 680 c->trans_mod->cancelled(c, oldreq); 681 } 682 683 p9_tag_remove(c, req); 684 return 0; 685} 686 687static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 688 int8_t type, int req_size, 689 const char *fmt, va_list ap) 690{ 691 int err; 692 struct p9_req_t *req; 693 694 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 695 696 /* we allow for any status other than disconnected */ 697 if (c->status == Disconnected) 698 return ERR_PTR(-EIO); 699 700 /* if status is begin_disconnected we allow only clunk request */ 701 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) 702 return ERR_PTR(-EIO); 703 704 req = p9_tag_alloc(c, type, req_size); 705 if (IS_ERR(req)) 706 return req; 707 708 /* marshall the data */ 709 p9pdu_prepare(&req->tc, req->tc.tag, type); 710 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); 711 if (err) 712 goto reterr; 713 p9pdu_finalize(c, &req->tc); 714 trace_9p_client_req(c, type, req->tc.tag); 715 return req; 716reterr: 717 p9_tag_remove(c, req); 718 /* We have to put also the 2nd reference as it won't be used */ 719 p9_req_put(req); 720 return ERR_PTR(err); 721} 722 723/** 724 * p9_client_rpc - issue a request and wait for a response 725 * @c: client session 726 * @type: type of request 727 * @fmt: protocol format string (see protocol.c) 728 * 729 * Returns request structure (which client must free using p9_tag_remove) 730 */ 731 732static struct p9_req_t * 733p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 734{ 735 va_list ap; 736 int sigpending, err; 737 unsigned long flags; 738 struct p9_req_t *req; 739 740 va_start(ap, fmt); 741 req = p9_client_prepare_req(c, type, c->msize, fmt, ap); 742 va_end(ap); 743 if (IS_ERR(req)) 744 return req; 745 746 if (signal_pending(current)) { 747 sigpending = 1; 748 clear_thread_flag(TIF_SIGPENDING); 749 } else 750 sigpending = 0; 751 752 err = c->trans_mod->request(c, req); 753 if (err < 0) { 754 /* write won't happen */ 755 p9_req_put(req); 756 if (err != -ERESTARTSYS && err != -EFAULT) 757 c->status = Disconnected; 758 goto recalc_sigpending; 759 } 760again: 761 /* Wait for the response */ 762 err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD); 763 764 /* 765 * Make sure our req is coherent with regard to updates in other 766 * threads - echoes to wmb() in the callback 767 */ 768 smp_rmb(); 769 770 if ((err == -ERESTARTSYS) && (c->status == Connected) 771 && (type == P9_TFLUSH)) { 772 sigpending = 1; 773 clear_thread_flag(TIF_SIGPENDING); 774 goto again; 775 } 776 777 if (req->status == REQ_STATUS_ERROR) { 778 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 779 err = req->t_err; 780 } 781 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 782 p9_debug(P9_DEBUG_MUX, "flushing\n"); 783 sigpending = 1; 784 clear_thread_flag(TIF_SIGPENDING); 785 786 if (c->trans_mod->cancel(c, req)) 787 p9_client_flush(c, req); 788 789 /* if we received the response anyway, don't signal error */ 790 if (req->status == REQ_STATUS_RCVD) 791 err = 0; 792 } 793recalc_sigpending: 794 if (sigpending) { 795 spin_lock_irqsave(¤t->sighand->siglock, flags); 796 recalc_sigpending(); 797 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 798 } 799 if (err < 0) 800 goto reterr; 801 802 err = p9_check_errors(c, req); 803 trace_9p_client_res(c, type, req->rc.tag, err); 804 if (!err) 805 return req; 806reterr: 807 p9_tag_remove(c, req); 808 return ERR_PTR(safe_errno(err)); 809} 810 811/** 812 * p9_client_zc_rpc - issue a request and wait for a response 813 * @c: client session 814 * @type: type of request 815 * @uidata: destination for zero copy read 816 * @uodata: source for zero copy write 817 * @inlen: read buffer size 818 * @olen: write buffer size 819 * @in_hdrlen: reader header size, This is the size of response protocol data 820 * @fmt: protocol format string (see protocol.c) 821 * 822 * Returns request structure (which client must free using p9_tag_remove) 823 */ 824static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 825 struct iov_iter *uidata, 826 struct iov_iter *uodata, 827 int inlen, int olen, int in_hdrlen, 828 const char *fmt, ...) 829{ 830 va_list ap; 831 int sigpending, err; 832 unsigned long flags; 833 struct p9_req_t *req; 834 835 va_start(ap, fmt); 836 /* 837 * We allocate a inline protocol data of only 4k bytes. 838 * The actual content is passed in zero-copy fashion. 839 */ 840 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); 841 va_end(ap); 842 if (IS_ERR(req)) 843 return req; 844 845 if (signal_pending(current)) { 846 sigpending = 1; 847 clear_thread_flag(TIF_SIGPENDING); 848 } else 849 sigpending = 0; 850 851 err = c->trans_mod->zc_request(c, req, uidata, uodata, 852 inlen, olen, in_hdrlen); 853 if (err < 0) { 854 if (err == -EIO) 855 c->status = Disconnected; 856 if (err != -ERESTARTSYS) 857 goto recalc_sigpending; 858 } 859 if (req->status == REQ_STATUS_ERROR) { 860 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 861 err = req->t_err; 862 } 863 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 864 p9_debug(P9_DEBUG_MUX, "flushing\n"); 865 sigpending = 1; 866 clear_thread_flag(TIF_SIGPENDING); 867 868 if (c->trans_mod->cancel(c, req)) 869 p9_client_flush(c, req); 870 871 /* if we received the response anyway, don't signal error */ 872 if (req->status == REQ_STATUS_RCVD) 873 err = 0; 874 } 875recalc_sigpending: 876 if (sigpending) { 877 spin_lock_irqsave(¤t->sighand->siglock, flags); 878 recalc_sigpending(); 879 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 880 } 881 if (err < 0) 882 goto reterr; 883 884 err = p9_check_zc_errors(c, req, uidata, in_hdrlen); 885 trace_9p_client_res(c, type, req->rc.tag, err); 886 if (!err) 887 return req; 888reterr: 889 p9_tag_remove(c, req); 890 return ERR_PTR(safe_errno(err)); 891} 892 893static struct p9_fid *p9_fid_create(struct p9_client *clnt) 894{ 895 int ret; 896 struct p9_fid *fid; 897 898 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 899 fid = kzalloc(sizeof(struct p9_fid), GFP_KERNEL); 900 if (!fid) 901 return NULL; 902 903 fid->mode = -1; 904 fid->uid = current_fsuid(); 905 fid->clnt = clnt; 906 907 idr_preload(GFP_KERNEL); 908 spin_lock_irq(&clnt->lock); 909 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, 910 GFP_NOWAIT); 911 spin_unlock_irq(&clnt->lock); 912 idr_preload_end(); 913 914 if (!ret) 915 return fid; 916 917 kfree(fid); 918 return NULL; 919} 920 921static void p9_fid_destroy(struct p9_fid *fid) 922{ 923 struct p9_client *clnt; 924 unsigned long flags; 925 926 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 927 clnt = fid->clnt; 928 spin_lock_irqsave(&clnt->lock, flags); 929 idr_remove(&clnt->fids, fid->fid); 930 spin_unlock_irqrestore(&clnt->lock, flags); 931 kfree(fid->rdir); 932 kfree(fid); 933} 934 935static int p9_client_version(struct p9_client *c) 936{ 937 int err = 0; 938 struct p9_req_t *req; 939 char *version = NULL; 940 int msize; 941 942 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 943 c->msize, c->proto_version); 944 945 switch (c->proto_version) { 946 case p9_proto_2000L: 947 req = p9_client_rpc(c, P9_TVERSION, "ds", 948 c->msize, "9P2000.L"); 949 break; 950 case p9_proto_2000u: 951 req = p9_client_rpc(c, P9_TVERSION, "ds", 952 c->msize, "9P2000.u"); 953 break; 954 case p9_proto_legacy: 955 req = p9_client_rpc(c, P9_TVERSION, "ds", 956 c->msize, "9P2000"); 957 break; 958 default: 959 return -EINVAL; 960 } 961 962 if (IS_ERR(req)) 963 return PTR_ERR(req); 964 965 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); 966 if (err) { 967 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 968 trace_9p_protocol_dump(c, &req->rc); 969 goto error; 970 } 971 972 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 973 if (!strncmp(version, "9P2000.L", 8)) 974 c->proto_version = p9_proto_2000L; 975 else if (!strncmp(version, "9P2000.u", 8)) 976 c->proto_version = p9_proto_2000u; 977 else if (!strncmp(version, "9P2000", 6)) 978 c->proto_version = p9_proto_legacy; 979 else { 980 p9_debug(P9_DEBUG_ERROR, 981 "server returned an unknown version: %s\n", version); 982 err = -EREMOTEIO; 983 goto error; 984 } 985 986 if (msize < 4096) { 987 p9_debug(P9_DEBUG_ERROR, 988 "server returned a msize < 4096: %d\n", msize); 989 err = -EREMOTEIO; 990 goto error; 991 } 992 if (msize < c->msize) 993 c->msize = msize; 994 995error: 996 kfree(version); 997 p9_tag_remove(c, req); 998 999 return err; 1000} 1001 1002struct p9_client *p9_client_create(const char *dev_name, char *options) 1003{ 1004 int err; 1005 struct p9_client *clnt; 1006 char *client_id; 1007 1008 err = 0; 1009 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 1010 if (!clnt) 1011 return ERR_PTR(-ENOMEM); 1012 1013 clnt->trans_mod = NULL; 1014 clnt->trans = NULL; 1015 clnt->fcall_cache = NULL; 1016 1017 client_id = utsname()->nodename; 1018 memcpy(clnt->name, client_id, strlen(client_id) + 1); 1019 1020 spin_lock_init(&clnt->lock); 1021 idr_init(&clnt->fids); 1022 idr_init(&clnt->reqs); 1023 1024 err = parse_opts(options, clnt); 1025 if (err < 0) 1026 goto free_client; 1027 1028 if (!clnt->trans_mod) 1029 clnt->trans_mod = v9fs_get_default_trans(); 1030 1031 if (clnt->trans_mod == NULL) { 1032 err = -EPROTONOSUPPORT; 1033 p9_debug(P9_DEBUG_ERROR, 1034 "No transport defined or default transport\n"); 1035 goto free_client; 1036 } 1037 1038 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1039 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1040 1041 err = clnt->trans_mod->create(clnt, dev_name, options); 1042 if (err) 1043 goto put_trans; 1044 1045 if (clnt->msize > clnt->trans_mod->maxsize) 1046 clnt->msize = clnt->trans_mod->maxsize; 1047 1048 if (clnt->msize < 4096) { 1049 p9_debug(P9_DEBUG_ERROR, 1050 "Please specify a msize of at least 4k\n"); 1051 err = -EINVAL; 1052 goto close_trans; 1053 } 1054 1055 err = p9_client_version(clnt); 1056 if (err) 1057 goto close_trans; 1058 1059 /* P9_HDRSZ + 4 is the smallest packet header we can have that is 1060 * followed by data accessed from userspace by read 1061 */ 1062 clnt->fcall_cache = 1063 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, 1064 0, 0, P9_HDRSZ + 4, 1065 clnt->msize - (P9_HDRSZ + 4), 1066 NULL); 1067 1068 return clnt; 1069 1070close_trans: 1071 clnt->trans_mod->close(clnt); 1072put_trans: 1073 v9fs_put_trans(clnt->trans_mod); 1074free_client: 1075 kfree(clnt); 1076 return ERR_PTR(err); 1077} 1078EXPORT_SYMBOL(p9_client_create); 1079 1080void p9_client_destroy(struct p9_client *clnt) 1081{ 1082 struct p9_fid *fid; 1083 int id; 1084 1085 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1086 1087 if (clnt->trans_mod) 1088 clnt->trans_mod->close(clnt); 1089 1090 v9fs_put_trans(clnt->trans_mod); 1091 1092 idr_for_each_entry(&clnt->fids, fid, id) { 1093 pr_info("Found fid %d not clunked\n", fid->fid); 1094 p9_fid_destroy(fid); 1095 } 1096 1097 p9_tag_cleanup(clnt); 1098 1099 kmem_cache_destroy(clnt->fcall_cache); 1100 kfree(clnt); 1101} 1102EXPORT_SYMBOL(p9_client_destroy); 1103 1104void p9_client_disconnect(struct p9_client *clnt) 1105{ 1106 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1107 clnt->status = Disconnected; 1108} 1109EXPORT_SYMBOL(p9_client_disconnect); 1110 1111void p9_client_begin_disconnect(struct p9_client *clnt) 1112{ 1113 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1114 clnt->status = BeginDisconnect; 1115} 1116EXPORT_SYMBOL(p9_client_begin_disconnect); 1117 1118struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1119 const char *uname, kuid_t n_uname, const char *aname) 1120{ 1121 int err = 0; 1122 struct p9_req_t *req; 1123 struct p9_fid *fid; 1124 struct p9_qid qid; 1125 1126 1127 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1128 afid ? afid->fid : -1, uname, aname); 1129 fid = p9_fid_create(clnt); 1130 if (!fid) { 1131 err = -ENOMEM; 1132 goto error; 1133 } 1134 fid->uid = n_uname; 1135 1136 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1137 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1138 if (IS_ERR(req)) { 1139 err = PTR_ERR(req); 1140 goto error; 1141 } 1142 1143 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); 1144 if (err) { 1145 trace_9p_protocol_dump(clnt, &req->rc); 1146 p9_tag_remove(clnt, req); 1147 goto error; 1148 } 1149 1150 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1151 qid.type, (unsigned long long)qid.path, qid.version); 1152 1153 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1154 1155 p9_tag_remove(clnt, req); 1156 return fid; 1157 1158error: 1159 if (fid) 1160 p9_fid_destroy(fid); 1161 return ERR_PTR(err); 1162} 1163EXPORT_SYMBOL(p9_client_attach); 1164 1165struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1166 const unsigned char * const *wnames, int clone) 1167{ 1168 int err; 1169 struct p9_client *clnt; 1170 struct p9_fid *fid; 1171 struct p9_qid *wqids; 1172 struct p9_req_t *req; 1173 uint16_t nwqids, count; 1174 1175 err = 0; 1176 wqids = NULL; 1177 clnt = oldfid->clnt; 1178 if (clone) { 1179 fid = p9_fid_create(clnt); 1180 if (!fid) { 1181 err = -ENOMEM; 1182 goto error; 1183 } 1184 1185 fid->uid = oldfid->uid; 1186 } else 1187 fid = oldfid; 1188 1189 1190 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1191 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1192 1193 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1194 nwname, wnames); 1195 if (IS_ERR(req)) { 1196 err = PTR_ERR(req); 1197 goto error; 1198 } 1199 1200 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1201 if (err) { 1202 trace_9p_protocol_dump(clnt, &req->rc); 1203 p9_tag_remove(clnt, req); 1204 goto clunk_fid; 1205 } 1206 p9_tag_remove(clnt, req); 1207 1208 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1209 1210 if (nwqids != nwname) { 1211 err = -ENOENT; 1212 goto clunk_fid; 1213 } 1214 1215 for (count = 0; count < nwqids; count++) 1216 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1217 count, wqids[count].type, 1218 (unsigned long long)wqids[count].path, 1219 wqids[count].version); 1220 1221 if (nwname) 1222 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1223 else 1224 fid->qid = oldfid->qid; 1225 1226 kfree(wqids); 1227 return fid; 1228 1229clunk_fid: 1230 kfree(wqids); 1231 p9_client_clunk(fid); 1232 fid = NULL; 1233 1234error: 1235 if (fid && (fid != oldfid)) 1236 p9_fid_destroy(fid); 1237 1238 return ERR_PTR(err); 1239} 1240EXPORT_SYMBOL(p9_client_walk); 1241 1242int p9_client_open(struct p9_fid *fid, int mode) 1243{ 1244 int err; 1245 struct p9_client *clnt; 1246 struct p9_req_t *req; 1247 struct p9_qid qid; 1248 int iounit; 1249 1250 clnt = fid->clnt; 1251 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1252 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1253 err = 0; 1254 1255 if (fid->mode != -1) 1256 return -EINVAL; 1257 1258 if (p9_is_proto_dotl(clnt)) 1259 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1260 else 1261 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1262 if (IS_ERR(req)) { 1263 err = PTR_ERR(req); 1264 goto error; 1265 } 1266 1267 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1268 if (err) { 1269 trace_9p_protocol_dump(clnt, &req->rc); 1270 goto free_and_error; 1271 } 1272 1273 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1274 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1275 (unsigned long long)qid.path, qid.version, iounit); 1276 1277 fid->mode = mode; 1278 fid->iounit = iounit; 1279 1280free_and_error: 1281 p9_tag_remove(clnt, req); 1282error: 1283 return err; 1284} 1285EXPORT_SYMBOL(p9_client_open); 1286 1287int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode, 1288 kgid_t gid, struct p9_qid *qid) 1289{ 1290 int err = 0; 1291 struct p9_client *clnt; 1292 struct p9_req_t *req; 1293 int iounit; 1294 1295 p9_debug(P9_DEBUG_9P, 1296 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1297 ofid->fid, name, flags, mode, 1298 from_kgid(&init_user_ns, gid)); 1299 clnt = ofid->clnt; 1300 1301 if (ofid->mode != -1) 1302 return -EINVAL; 1303 1304 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1305 mode, gid); 1306 if (IS_ERR(req)) { 1307 err = PTR_ERR(req); 1308 goto error; 1309 } 1310 1311 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); 1312 if (err) { 1313 trace_9p_protocol_dump(clnt, &req->rc); 1314 goto free_and_error; 1315 } 1316 1317 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1318 qid->type, 1319 (unsigned long long)qid->path, 1320 qid->version, iounit); 1321 1322 ofid->mode = mode; 1323 ofid->iounit = iounit; 1324 1325free_and_error: 1326 p9_tag_remove(clnt, req); 1327error: 1328 return err; 1329} 1330EXPORT_SYMBOL(p9_client_create_dotl); 1331 1332int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1333 char *extension) 1334{ 1335 int err; 1336 struct p9_client *clnt; 1337 struct p9_req_t *req; 1338 struct p9_qid qid; 1339 int iounit; 1340 1341 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1342 fid->fid, name, perm, mode); 1343 err = 0; 1344 clnt = fid->clnt; 1345 1346 if (fid->mode != -1) 1347 return -EINVAL; 1348 1349 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1350 mode, extension); 1351 if (IS_ERR(req)) { 1352 err = PTR_ERR(req); 1353 goto error; 1354 } 1355 1356 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1357 if (err) { 1358 trace_9p_protocol_dump(clnt, &req->rc); 1359 goto free_and_error; 1360 } 1361 1362 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1363 qid.type, 1364 (unsigned long long)qid.path, 1365 qid.version, iounit); 1366 1367 fid->mode = mode; 1368 fid->iounit = iounit; 1369 1370free_and_error: 1371 p9_tag_remove(clnt, req); 1372error: 1373 return err; 1374} 1375EXPORT_SYMBOL(p9_client_fcreate); 1376 1377int p9_client_symlink(struct p9_fid *dfid, const char *name, 1378 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1379{ 1380 int err = 0; 1381 struct p9_client *clnt; 1382 struct p9_req_t *req; 1383 1384 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1385 dfid->fid, name, symtgt); 1386 clnt = dfid->clnt; 1387 1388 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1389 gid); 1390 if (IS_ERR(req)) { 1391 err = PTR_ERR(req); 1392 goto error; 1393 } 1394 1395 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 1396 if (err) { 1397 trace_9p_protocol_dump(clnt, &req->rc); 1398 goto free_and_error; 1399 } 1400 1401 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1402 qid->type, (unsigned long long)qid->path, qid->version); 1403 1404free_and_error: 1405 p9_tag_remove(clnt, req); 1406error: 1407 return err; 1408} 1409EXPORT_SYMBOL(p9_client_symlink); 1410 1411int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1412{ 1413 struct p9_client *clnt; 1414 struct p9_req_t *req; 1415 1416 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1417 dfid->fid, oldfid->fid, newname); 1418 clnt = dfid->clnt; 1419 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1420 newname); 1421 if (IS_ERR(req)) 1422 return PTR_ERR(req); 1423 1424 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1425 p9_tag_remove(clnt, req); 1426 return 0; 1427} 1428EXPORT_SYMBOL(p9_client_link); 1429 1430int p9_client_fsync(struct p9_fid *fid, int datasync) 1431{ 1432 int err; 1433 struct p9_client *clnt; 1434 struct p9_req_t *req; 1435 1436 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1437 fid->fid, datasync); 1438 err = 0; 1439 clnt = fid->clnt; 1440 1441 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1442 if (IS_ERR(req)) { 1443 err = PTR_ERR(req); 1444 goto error; 1445 } 1446 1447 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1448 1449 p9_tag_remove(clnt, req); 1450 1451error: 1452 return err; 1453} 1454EXPORT_SYMBOL(p9_client_fsync); 1455 1456int p9_client_clunk(struct p9_fid *fid) 1457{ 1458 int err; 1459 struct p9_client *clnt; 1460 struct p9_req_t *req; 1461 int retries = 0; 1462 1463 if (!fid) { 1464 pr_warn("%s (%d): Trying to clunk with NULL fid\n", 1465 __func__, task_pid_nr(current)); 1466 dump_stack(); 1467 return 0; 1468 } 1469 1470again: 1471 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid, 1472 retries); 1473 err = 0; 1474 clnt = fid->clnt; 1475 1476 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1477 if (IS_ERR(req)) { 1478 err = PTR_ERR(req); 1479 goto error; 1480 } 1481 1482 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1483 1484 p9_tag_remove(clnt, req); 1485error: 1486 /* 1487 * Fid is not valid even after a failed clunk 1488 * If interrupted, retry once then give up and 1489 * leak fid until umount. 1490 */ 1491 if (err == -ERESTARTSYS) { 1492 if (retries++ == 0) 1493 goto again; 1494 } else 1495 p9_fid_destroy(fid); 1496 return err; 1497} 1498EXPORT_SYMBOL(p9_client_clunk); 1499 1500int p9_client_remove(struct p9_fid *fid) 1501{ 1502 int err; 1503 struct p9_client *clnt; 1504 struct p9_req_t *req; 1505 1506 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1507 err = 0; 1508 clnt = fid->clnt; 1509 1510 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1511 if (IS_ERR(req)) { 1512 err = PTR_ERR(req); 1513 goto error; 1514 } 1515 1516 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1517 1518 p9_tag_remove(clnt, req); 1519error: 1520 if (err == -ERESTARTSYS) 1521 p9_client_clunk(fid); 1522 else 1523 p9_fid_destroy(fid); 1524 return err; 1525} 1526EXPORT_SYMBOL(p9_client_remove); 1527 1528int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1529{ 1530 int err = 0; 1531 struct p9_req_t *req; 1532 struct p9_client *clnt; 1533 1534 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1535 dfid->fid, name, flags); 1536 1537 clnt = dfid->clnt; 1538 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1539 if (IS_ERR(req)) { 1540 err = PTR_ERR(req); 1541 goto error; 1542 } 1543 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1544 1545 p9_tag_remove(clnt, req); 1546error: 1547 return err; 1548} 1549EXPORT_SYMBOL(p9_client_unlinkat); 1550 1551int 1552p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1553{ 1554 int total = 0; 1555 *err = 0; 1556 1557 while (iov_iter_count(to)) { 1558 int count; 1559 1560 count = p9_client_read_once(fid, offset, to, err); 1561 if (!count || *err) 1562 break; 1563 offset += count; 1564 total += count; 1565 } 1566 return total; 1567} 1568EXPORT_SYMBOL(p9_client_read); 1569 1570int 1571p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, 1572 int *err) 1573{ 1574 struct p9_client *clnt = fid->clnt; 1575 struct p9_req_t *req; 1576 int count = iov_iter_count(to); 1577 int rsize, non_zc = 0; 1578 char *dataptr; 1579 1580 *err = 0; 1581 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", 1582 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to)); 1583 1584 rsize = fid->iounit; 1585 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1586 rsize = clnt->msize - P9_IOHDRSZ; 1587 1588 if (count < rsize) 1589 rsize = count; 1590 1591 /* Don't bother zerocopy for small IO (< 1024) */ 1592 if (clnt->trans_mod->zc_request && rsize > 1024) { 1593 /* response header len is 11 1594 * PDU Header(7) + IO Size (4) 1595 */ 1596 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1597 0, 11, "dqd", fid->fid, 1598 offset, rsize); 1599 } else { 1600 non_zc = 1; 1601 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1602 rsize); 1603 } 1604 if (IS_ERR(req)) { 1605 *err = PTR_ERR(req); 1606 return 0; 1607 } 1608 1609 *err = p9pdu_readf(&req->rc, clnt->proto_version, 1610 "D", &count, &dataptr); 1611 if (*err) { 1612 trace_9p_protocol_dump(clnt, &req->rc); 1613 p9_tag_remove(clnt, req); 1614 return 0; 1615 } 1616 if (rsize < count) { 1617 pr_err("bogus RREAD count (%d > %d)\n", count, rsize); 1618 count = rsize; 1619 } 1620 1621 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1622 1623 if (non_zc) { 1624 int n = copy_to_iter(dataptr, count, to); 1625 1626 if (n != count) { 1627 *err = -EFAULT; 1628 p9_tag_remove(clnt, req); 1629 return n; 1630 } 1631 } else { 1632 iov_iter_advance(to, count); 1633 } 1634 p9_tag_remove(clnt, req); 1635 return count; 1636} 1637EXPORT_SYMBOL(p9_client_read_once); 1638 1639int 1640p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1641{ 1642 struct p9_client *clnt = fid->clnt; 1643 struct p9_req_t *req; 1644 int total = 0; 1645 *err = 0; 1646 1647 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", 1648 fid->fid, (unsigned long long) offset, 1649 iov_iter_count(from)); 1650 1651 while (iov_iter_count(from)) { 1652 int count = iov_iter_count(from); 1653 int rsize = fid->iounit; 1654 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1655 rsize = clnt->msize - P9_IOHDRSZ; 1656 1657 if (count < rsize) 1658 rsize = count; 1659 1660 /* Don't bother zerocopy for small IO (< 1024) */ 1661 if (clnt->trans_mod->zc_request && rsize > 1024) { 1662 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1663 rsize, P9_ZC_HDR_SZ, "dqd", 1664 fid->fid, offset, rsize); 1665 } else { 1666 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1667 offset, rsize, from); 1668 } 1669 if (IS_ERR(req)) { 1670 *err = PTR_ERR(req); 1671 break; 1672 } 1673 1674 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count); 1675 if (*err) { 1676 trace_9p_protocol_dump(clnt, &req->rc); 1677 p9_tag_remove(clnt, req); 1678 break; 1679 } 1680 if (rsize < count) { 1681 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize); 1682 count = rsize; 1683 } 1684 1685 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1686 1687 p9_tag_remove(clnt, req); 1688 iov_iter_advance(from, count); 1689 total += count; 1690 offset += count; 1691 } 1692 return total; 1693} 1694EXPORT_SYMBOL(p9_client_write); 1695 1696struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1697{ 1698 int err; 1699 struct p9_client *clnt; 1700 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1701 struct p9_req_t *req; 1702 u16 ignored; 1703 1704 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1705 1706 if (!ret) 1707 return ERR_PTR(-ENOMEM); 1708 1709 err = 0; 1710 clnt = fid->clnt; 1711 1712 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1713 if (IS_ERR(req)) { 1714 err = PTR_ERR(req); 1715 goto error; 1716 } 1717 1718 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); 1719 if (err) { 1720 trace_9p_protocol_dump(clnt, &req->rc); 1721 p9_tag_remove(clnt, req); 1722 goto error; 1723 } 1724 1725 p9_debug(P9_DEBUG_9P, 1726 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1727 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1728 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1729 "<<< uid=%d gid=%d n_muid=%d\n", 1730 ret->size, ret->type, ret->dev, ret->qid.type, 1731 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1732 ret->atime, ret->mtime, (unsigned long long)ret->length, 1733 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1734 from_kuid(&init_user_ns, ret->n_uid), 1735 from_kgid(&init_user_ns, ret->n_gid), 1736 from_kuid(&init_user_ns, ret->n_muid)); 1737 1738 p9_tag_remove(clnt, req); 1739 return ret; 1740 1741error: 1742 kfree(ret); 1743 return ERR_PTR(err); 1744} 1745EXPORT_SYMBOL(p9_client_stat); 1746 1747struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1748 u64 request_mask) 1749{ 1750 int err; 1751 struct p9_client *clnt; 1752 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1753 GFP_KERNEL); 1754 struct p9_req_t *req; 1755 1756 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1757 fid->fid, request_mask); 1758 1759 if (!ret) 1760 return ERR_PTR(-ENOMEM); 1761 1762 err = 0; 1763 clnt = fid->clnt; 1764 1765 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1766 if (IS_ERR(req)) { 1767 err = PTR_ERR(req); 1768 goto error; 1769 } 1770 1771 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); 1772 if (err) { 1773 trace_9p_protocol_dump(clnt, &req->rc); 1774 p9_tag_remove(clnt, req); 1775 goto error; 1776 } 1777 1778 p9_debug(P9_DEBUG_9P, 1779 "<<< RGETATTR st_result_mask=%lld\n" 1780 "<<< qid=%x.%llx.%x\n" 1781 "<<< st_mode=%8.8x st_nlink=%llu\n" 1782 "<<< st_uid=%d st_gid=%d\n" 1783 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1784 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1785 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1786 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1787 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1788 "<<< st_gen=%lld st_data_version=%lld\n", 1789 ret->st_result_mask, ret->qid.type, ret->qid.path, 1790 ret->qid.version, ret->st_mode, ret->st_nlink, 1791 from_kuid(&init_user_ns, ret->st_uid), 1792 from_kgid(&init_user_ns, ret->st_gid), 1793 ret->st_rdev, ret->st_size, ret->st_blksize, 1794 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1795 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1796 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1797 ret->st_gen, ret->st_data_version); 1798 1799 p9_tag_remove(clnt, req); 1800 return ret; 1801 1802error: 1803 kfree(ret); 1804 return ERR_PTR(err); 1805} 1806EXPORT_SYMBOL(p9_client_getattr_dotl); 1807 1808static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1809{ 1810 int ret; 1811 1812 /* NOTE: size shouldn't include its own length */ 1813 /* size[2] type[2] dev[4] qid[13] */ 1814 /* mode[4] atime[4] mtime[4] length[8]*/ 1815 /* name[s] uid[s] gid[s] muid[s] */ 1816 ret = 2+4+13+4+4+4+8+2+2+2+2; 1817 1818 if (wst->name) 1819 ret += strlen(wst->name); 1820 if (wst->uid) 1821 ret += strlen(wst->uid); 1822 if (wst->gid) 1823 ret += strlen(wst->gid); 1824 if (wst->muid) 1825 ret += strlen(wst->muid); 1826 1827 if ((proto_version == p9_proto_2000u) || 1828 (proto_version == p9_proto_2000L)) { 1829 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1830 if (wst->extension) 1831 ret += strlen(wst->extension); 1832 } 1833 1834 return ret; 1835} 1836 1837int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1838{ 1839 int err; 1840 struct p9_req_t *req; 1841 struct p9_client *clnt; 1842 1843 err = 0; 1844 clnt = fid->clnt; 1845 wst->size = p9_client_statsize(wst, clnt->proto_version); 1846 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1847 p9_debug(P9_DEBUG_9P, 1848 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1849 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1850 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1851 " uid=%d gid=%d n_muid=%d\n", 1852 wst->size, wst->type, wst->dev, wst->qid.type, 1853 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1854 wst->atime, wst->mtime, (unsigned long long)wst->length, 1855 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1856 from_kuid(&init_user_ns, wst->n_uid), 1857 from_kgid(&init_user_ns, wst->n_gid), 1858 from_kuid(&init_user_ns, wst->n_muid)); 1859 1860 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1861 if (IS_ERR(req)) { 1862 err = PTR_ERR(req); 1863 goto error; 1864 } 1865 1866 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1867 1868 p9_tag_remove(clnt, req); 1869error: 1870 return err; 1871} 1872EXPORT_SYMBOL(p9_client_wstat); 1873 1874int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1875{ 1876 int err; 1877 struct p9_req_t *req; 1878 struct p9_client *clnt; 1879 1880 err = 0; 1881 clnt = fid->clnt; 1882 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1883 p9_debug(P9_DEBUG_9P, 1884 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1885 " atime_sec=%lld atime_nsec=%lld\n" 1886 " mtime_sec=%lld mtime_nsec=%lld\n", 1887 p9attr->valid, p9attr->mode, 1888 from_kuid(&init_user_ns, p9attr->uid), 1889 from_kgid(&init_user_ns, p9attr->gid), 1890 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1891 p9attr->mtime_sec, p9attr->mtime_nsec); 1892 1893 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1894 1895 if (IS_ERR(req)) { 1896 err = PTR_ERR(req); 1897 goto error; 1898 } 1899 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1900 p9_tag_remove(clnt, req); 1901error: 1902 return err; 1903} 1904EXPORT_SYMBOL(p9_client_setattr); 1905 1906int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1907{ 1908 int err; 1909 struct p9_req_t *req; 1910 struct p9_client *clnt; 1911 1912 err = 0; 1913 clnt = fid->clnt; 1914 1915 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1916 1917 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1918 if (IS_ERR(req)) { 1919 err = PTR_ERR(req); 1920 goto error; 1921 } 1922 1923 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1924 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1925 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1926 if (err) { 1927 trace_9p_protocol_dump(clnt, &req->rc); 1928 p9_tag_remove(clnt, req); 1929 goto error; 1930 } 1931 1932 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1933 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1934 "fsid %llu namelen %ld\n", 1935 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1936 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1937 sb->fsid, (long int)sb->namelen); 1938 1939 p9_tag_remove(clnt, req); 1940error: 1941 return err; 1942} 1943EXPORT_SYMBOL(p9_client_statfs); 1944 1945int p9_client_rename(struct p9_fid *fid, 1946 struct p9_fid *newdirfid, const char *name) 1947{ 1948 int err; 1949 struct p9_req_t *req; 1950 struct p9_client *clnt; 1951 1952 err = 0; 1953 clnt = fid->clnt; 1954 1955 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1956 fid->fid, newdirfid->fid, name); 1957 1958 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1959 newdirfid->fid, name); 1960 if (IS_ERR(req)) { 1961 err = PTR_ERR(req); 1962 goto error; 1963 } 1964 1965 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1966 1967 p9_tag_remove(clnt, req); 1968error: 1969 return err; 1970} 1971EXPORT_SYMBOL(p9_client_rename); 1972 1973int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1974 struct p9_fid *newdirfid, const char *new_name) 1975{ 1976 int err; 1977 struct p9_req_t *req; 1978 struct p9_client *clnt; 1979 1980 err = 0; 1981 clnt = olddirfid->clnt; 1982 1983 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" 1984 " newdirfid %d new name %s\n", olddirfid->fid, old_name, 1985 newdirfid->fid, new_name); 1986 1987 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1988 old_name, newdirfid->fid, new_name); 1989 if (IS_ERR(req)) { 1990 err = PTR_ERR(req); 1991 goto error; 1992 } 1993 1994 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1995 newdirfid->fid, new_name); 1996 1997 p9_tag_remove(clnt, req); 1998error: 1999 return err; 2000} 2001EXPORT_SYMBOL(p9_client_renameat); 2002 2003/* 2004 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 2005 */ 2006struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 2007 const char *attr_name, u64 *attr_size) 2008{ 2009 int err; 2010 struct p9_req_t *req; 2011 struct p9_client *clnt; 2012 struct p9_fid *attr_fid; 2013 2014 err = 0; 2015 clnt = file_fid->clnt; 2016 attr_fid = p9_fid_create(clnt); 2017 if (!attr_fid) { 2018 err = -ENOMEM; 2019 goto error; 2020 } 2021 p9_debug(P9_DEBUG_9P, 2022 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 2023 file_fid->fid, attr_fid->fid, attr_name); 2024 2025 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 2026 file_fid->fid, attr_fid->fid, attr_name); 2027 if (IS_ERR(req)) { 2028 err = PTR_ERR(req); 2029 goto error; 2030 } 2031 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); 2032 if (err) { 2033 trace_9p_protocol_dump(clnt, &req->rc); 2034 p9_tag_remove(clnt, req); 2035 goto clunk_fid; 2036 } 2037 p9_tag_remove(clnt, req); 2038 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2039 attr_fid->fid, *attr_size); 2040 return attr_fid; 2041clunk_fid: 2042 p9_client_clunk(attr_fid); 2043 attr_fid = NULL; 2044error: 2045 if (attr_fid && (attr_fid != file_fid)) 2046 p9_fid_destroy(attr_fid); 2047 2048 return ERR_PTR(err); 2049} 2050EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2051 2052int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2053 u64 attr_size, int flags) 2054{ 2055 int err; 2056 struct p9_req_t *req; 2057 struct p9_client *clnt; 2058 2059 p9_debug(P9_DEBUG_9P, 2060 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 2061 fid->fid, name, (long long)attr_size, flags); 2062 err = 0; 2063 clnt = fid->clnt; 2064 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2065 fid->fid, name, attr_size, flags); 2066 if (IS_ERR(req)) { 2067 err = PTR_ERR(req); 2068 goto error; 2069 } 2070 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2071 p9_tag_remove(clnt, req); 2072error: 2073 return err; 2074} 2075EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2076 2077int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2078{ 2079 int err, rsize, non_zc = 0; 2080 struct p9_client *clnt; 2081 struct p9_req_t *req; 2082 char *dataptr; 2083 struct kvec kv = {.iov_base = data, .iov_len = count}; 2084 struct iov_iter to; 2085 2086 iov_iter_kvec(&to, READ, &kv, 1, count); 2087 2088 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2089 fid->fid, (unsigned long long) offset, count); 2090 2091 err = 0; 2092 clnt = fid->clnt; 2093 2094 rsize = fid->iounit; 2095 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 2096 rsize = clnt->msize - P9_READDIRHDRSZ; 2097 2098 if (count < rsize) 2099 rsize = count; 2100 2101 /* Don't bother zerocopy for small IO (< 1024) */ 2102 if (clnt->trans_mod->zc_request && rsize > 1024) { 2103 /* 2104 * response header len is 11 2105 * PDU Header(7) + IO Size (4) 2106 */ 2107 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2108 11, "dqd", fid->fid, offset, rsize); 2109 } else { 2110 non_zc = 1; 2111 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2112 offset, rsize); 2113 } 2114 if (IS_ERR(req)) { 2115 err = PTR_ERR(req); 2116 goto error; 2117 } 2118 2119 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); 2120 if (err) { 2121 trace_9p_protocol_dump(clnt, &req->rc); 2122 goto free_and_error; 2123 } 2124 if (rsize < count) { 2125 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2126 count = rsize; 2127 } 2128 2129 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2130 2131 if (non_zc) 2132 memmove(data, dataptr, count); 2133 2134 p9_tag_remove(clnt, req); 2135 return count; 2136 2137free_and_error: 2138 p9_tag_remove(clnt, req); 2139error: 2140 return err; 2141} 2142EXPORT_SYMBOL(p9_client_readdir); 2143 2144int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2145 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2146{ 2147 int err; 2148 struct p9_client *clnt; 2149 struct p9_req_t *req; 2150 2151 err = 0; 2152 clnt = fid->clnt; 2153 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 2154 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2155 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2156 MAJOR(rdev), MINOR(rdev), 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, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 2166 (unsigned long long)qid->path, qid->version); 2167 2168error: 2169 p9_tag_remove(clnt, req); 2170 return err; 2171 2172} 2173EXPORT_SYMBOL(p9_client_mknod_dotl); 2174 2175int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2176 kgid_t gid, struct p9_qid *qid) 2177{ 2178 int err; 2179 struct p9_client *clnt; 2180 struct p9_req_t *req; 2181 2182 err = 0; 2183 clnt = fid->clnt; 2184 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2185 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2186 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode, 2187 gid); 2188 if (IS_ERR(req)) 2189 return PTR_ERR(req); 2190 2191 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2192 if (err) { 2193 trace_9p_protocol_dump(clnt, &req->rc); 2194 goto error; 2195 } 2196 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2197 (unsigned long long)qid->path, qid->version); 2198 2199error: 2200 p9_tag_remove(clnt, req); 2201 return err; 2202 2203} 2204EXPORT_SYMBOL(p9_client_mkdir_dotl); 2205 2206int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2207{ 2208 int err; 2209 struct p9_client *clnt; 2210 struct p9_req_t *req; 2211 2212 err = 0; 2213 clnt = fid->clnt; 2214 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " 2215 "start %lld length %lld proc_id %d client_id %s\n", 2216 fid->fid, flock->type, flock->flags, flock->start, 2217 flock->length, flock->proc_id, flock->client_id); 2218 2219 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2220 flock->flags, flock->start, flock->length, 2221 flock->proc_id, flock->client_id); 2222 2223 if (IS_ERR(req)) 2224 return PTR_ERR(req); 2225 2226 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); 2227 if (err) { 2228 trace_9p_protocol_dump(clnt, &req->rc); 2229 goto error; 2230 } 2231 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2232error: 2233 p9_tag_remove(clnt, req); 2234 return err; 2235 2236} 2237EXPORT_SYMBOL(p9_client_lock_dotl); 2238 2239int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2240{ 2241 int err; 2242 struct p9_client *clnt; 2243 struct p9_req_t *req; 2244 2245 err = 0; 2246 clnt = fid->clnt; 2247 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " 2248 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, 2249 glock->start, glock->length, glock->proc_id, glock->client_id); 2250 2251 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, 2252 glock->start, glock->length, glock->proc_id, glock->client_id); 2253 2254 if (IS_ERR(req)) 2255 return PTR_ERR(req); 2256 2257 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, 2258 &glock->start, &glock->length, &glock->proc_id, 2259 &glock->client_id); 2260 if (err) { 2261 trace_9p_protocol_dump(clnt, &req->rc); 2262 goto error; 2263 } 2264 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " 2265 "proc_id %d client_id %s\n", glock->type, glock->start, 2266 glock->length, glock->proc_id, glock->client_id); 2267error: 2268 p9_tag_remove(clnt, req); 2269 return err; 2270} 2271EXPORT_SYMBOL(p9_client_getlock_dotl); 2272 2273int p9_client_readlink(struct p9_fid *fid, char **target) 2274{ 2275 int err; 2276 struct p9_client *clnt; 2277 struct p9_req_t *req; 2278 2279 err = 0; 2280 clnt = fid->clnt; 2281 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2282 2283 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2284 if (IS_ERR(req)) 2285 return PTR_ERR(req); 2286 2287 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); 2288 if (err) { 2289 trace_9p_protocol_dump(clnt, &req->rc); 2290 goto error; 2291 } 2292 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2293error: 2294 p9_tag_remove(clnt, req); 2295 return err; 2296} 2297EXPORT_SYMBOL(p9_client_readlink); 2298 2299int __init p9_client_init(void) 2300{ 2301 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); 2302 return p9_req_cache ? 0 : -ENOMEM; 2303} 2304 2305void __exit p9_client_exit(void) 2306{ 2307 kmem_cache_destroy(p9_req_cache); 2308} 2309