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 #define DEFAULT_MSIZE (128 * 1024) 32 33 /* Client Option Parsing (code inspired by NFS code) 34 * - a little lazy - parse all client options 35 */ 36 37 enum { 38 Opt_msize, 39 Opt_trans, 40 Opt_legacy, 41 Opt_version, 42 Opt_err, 43 }; 44 45 static const match_table_t tokens = { 46 {Opt_msize, "msize=%u"}, 47 {Opt_legacy, "noextend"}, 48 {Opt_trans, "trans=%s"}, 49 {Opt_version, "version=%s"}, 50 {Opt_err, NULL}, 51 }; 52 53 inline int p9_is_proto_dotl(struct p9_client *clnt) 54 { 55 return clnt->proto_version == p9_proto_2000L; 56 } 57 EXPORT_SYMBOL(p9_is_proto_dotl); 58 59 inline int p9_is_proto_dotu(struct p9_client *clnt) 60 { 61 return clnt->proto_version == p9_proto_2000u; 62 } 63 EXPORT_SYMBOL(p9_is_proto_dotu); 64 65 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt) 66 { 67 if (clnt->msize != DEFAULT_MSIZE) 68 seq_printf(m, ",msize=%u", clnt->msize); 69 seq_printf(m, ",trans=%s", clnt->trans_mod->name); 70 71 switch (clnt->proto_version) { 72 case p9_proto_legacy: 73 seq_puts(m, ",noextend"); 74 break; 75 case p9_proto_2000u: 76 seq_puts(m, ",version=9p2000.u"); 77 break; 78 case p9_proto_2000L: 79 /* Default */ 80 break; 81 } 82 83 if (clnt->trans_mod->show_options) 84 return clnt->trans_mod->show_options(m, clnt); 85 return 0; 86 } 87 EXPORT_SYMBOL(p9_show_client_options); 88 89 /* Some error codes are taken directly from the server replies, 90 * make sure they are valid. 91 */ 92 static int safe_errno(int err) 93 { 94 if (err > 0 || err < -MAX_ERRNO) { 95 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err); 96 return -EPROTO; 97 } 98 return err; 99 } 100 101 /* Interpret mount option for protocol version */ 102 static int get_protocol_version(char *s) 103 { 104 int version = -EINVAL; 105 106 if (!strcmp(s, "9p2000")) { 107 version = p9_proto_legacy; 108 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n"); 109 } else if (!strcmp(s, "9p2000.u")) { 110 version = p9_proto_2000u; 111 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); 112 } else if (!strcmp(s, "9p2000.L")) { 113 version = p9_proto_2000L; 114 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); 115 } else { 116 pr_info("Unknown protocol version %s\n", s); 117 } 118 119 return version; 120 } 121 122 /** 123 * parse_opts - parse mount options into client structure 124 * @opts: options string passed from mount 125 * @clnt: existing v9fs client information 126 * 127 * Return 0 upon success, -ERRNO upon failure 128 */ 129 130 static int parse_opts(char *opts, struct p9_client *clnt) 131 { 132 char *options, *tmp_options; 133 char *p; 134 substring_t args[MAX_OPT_ARGS]; 135 int option; 136 char *s; 137 int ret = 0; 138 139 clnt->proto_version = p9_proto_2000L; 140 clnt->msize = DEFAULT_MSIZE; 141 142 if (!opts) 143 return 0; 144 145 tmp_options = kstrdup(opts, GFP_KERNEL); 146 if (!tmp_options) 147 return -ENOMEM; 148 options = tmp_options; 149 150 while ((p = strsep(&options, ",")) != NULL) { 151 int token, r; 152 153 if (!*p) 154 continue; 155 token = match_token(p, tokens, args); 156 switch (token) { 157 case Opt_msize: 158 r = match_int(&args[0], &option); 159 if (r < 0) { 160 p9_debug(P9_DEBUG_ERROR, 161 "integer field, but no integer?\n"); 162 ret = r; 163 continue; 164 } 165 if (option < 4096) { 166 p9_debug(P9_DEBUG_ERROR, 167 "msize should be at least 4k\n"); 168 ret = -EINVAL; 169 continue; 170 } 171 clnt->msize = option; 172 break; 173 case Opt_trans: 174 s = match_strdup(&args[0]); 175 if (!s) { 176 ret = -ENOMEM; 177 p9_debug(P9_DEBUG_ERROR, 178 "problem allocating copy of trans arg\n"); 179 goto free_and_return; 180 } 181 182 v9fs_put_trans(clnt->trans_mod); 183 clnt->trans_mod = v9fs_get_trans_by_name(s); 184 if (!clnt->trans_mod) { 185 pr_info("Could not find request transport: %s\n", 186 s); 187 ret = -EINVAL; 188 } 189 kfree(s); 190 break; 191 case Opt_legacy: 192 clnt->proto_version = p9_proto_legacy; 193 break; 194 case Opt_version: 195 s = match_strdup(&args[0]); 196 if (!s) { 197 ret = -ENOMEM; 198 p9_debug(P9_DEBUG_ERROR, 199 "problem allocating copy of version arg\n"); 200 goto free_and_return; 201 } 202 r = get_protocol_version(s); 203 if (r < 0) 204 ret = r; 205 else 206 clnt->proto_version = r; 207 kfree(s); 208 break; 209 default: 210 continue; 211 } 212 } 213 214 free_and_return: 215 if (ret) 216 v9fs_put_trans(clnt->trans_mod); 217 kfree(tmp_options); 218 return ret; 219 } 220 221 static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc, 222 int alloc_msize) 223 { 224 if (likely(c->fcall_cache) && alloc_msize == c->msize) { 225 fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS); 226 fc->cache = c->fcall_cache; 227 } else { 228 fc->sdata = kmalloc(alloc_msize, GFP_NOFS); 229 fc->cache = NULL; 230 } 231 if (!fc->sdata) 232 return -ENOMEM; 233 fc->capacity = alloc_msize; 234 return 0; 235 } 236 237 void p9_fcall_fini(struct p9_fcall *fc) 238 { 239 /* sdata can be NULL for interrupted requests in trans_rdma, 240 * and kmem_cache_free does not do NULL-check for us 241 */ 242 if (unlikely(!fc->sdata)) 243 return; 244 245 if (fc->cache) 246 kmem_cache_free(fc->cache, fc->sdata); 247 else 248 kfree(fc->sdata); 249 } 250 EXPORT_SYMBOL(p9_fcall_fini); 251 252 static struct kmem_cache *p9_req_cache; 253 254 /** 255 * p9_tag_alloc - Allocate a new request. 256 * @c: Client session. 257 * @type: Transaction type. 258 * @max_size: Maximum packet size for this request. 259 * 260 * Context: Process context. 261 * Return: Pointer to new request. 262 */ 263 static struct p9_req_t * 264 p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size) 265 { 266 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); 267 int alloc_msize = min(c->msize, max_size); 268 int tag; 269 270 if (!req) 271 return ERR_PTR(-ENOMEM); 272 273 if (p9_fcall_init(c, &req->tc, alloc_msize)) 274 goto free_req; 275 if (p9_fcall_init(c, &req->rc, alloc_msize)) 276 goto free; 277 278 p9pdu_reset(&req->tc); 279 p9pdu_reset(&req->rc); 280 req->t_err = 0; 281 req->status = REQ_STATUS_ALLOC; 282 init_waitqueue_head(&req->wq); 283 INIT_LIST_HEAD(&req->req_list); 284 285 idr_preload(GFP_NOFS); 286 spin_lock_irq(&c->lock); 287 if (type == P9_TVERSION) 288 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1, 289 GFP_NOWAIT); 290 else 291 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT); 292 req->tc.tag = tag; 293 spin_unlock_irq(&c->lock); 294 idr_preload_end(); 295 if (tag < 0) 296 goto free; 297 298 /* Init ref to two because in the general case there is one ref 299 * that is put asynchronously by a writer thread, one ref 300 * temporarily given by p9_tag_lookup and put by p9_client_cb 301 * in the recv thread, and one ref put by p9_req_put in the 302 * main thread. The only exception is virtio that does not use 303 * p9_tag_lookup but does not have a writer thread either 304 * (the write happens synchronously in the request/zc_request 305 * callback), so p9_client_cb eats the second ref there 306 * as the pointer is duplicated directly by virtqueue_add_sgs() 307 */ 308 refcount_set(&req->refcount, 2); 309 310 return req; 311 312 free: 313 p9_fcall_fini(&req->tc); 314 p9_fcall_fini(&req->rc); 315 free_req: 316 kmem_cache_free(p9_req_cache, req); 317 return ERR_PTR(-ENOMEM); 318 } 319 320 /** 321 * p9_tag_lookup - Look up a request by tag. 322 * @c: Client session. 323 * @tag: Transaction ID. 324 * 325 * Context: Any context. 326 * Return: A request, or %NULL if there is no request with that tag. 327 */ 328 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 329 { 330 struct p9_req_t *req; 331 332 rcu_read_lock(); 333 again: 334 req = idr_find(&c->reqs, tag); 335 if (req) { 336 /* We have to be careful with the req found under rcu_read_lock 337 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the 338 * ref again without corrupting other data, then check again 339 * that the tag matches once we have the ref 340 */ 341 if (!p9_req_try_get(req)) 342 goto again; 343 if (req->tc.tag != tag) { 344 p9_req_put(c, req); 345 goto again; 346 } 347 } 348 rcu_read_unlock(); 349 350 return req; 351 } 352 EXPORT_SYMBOL(p9_tag_lookup); 353 354 /** 355 * p9_tag_remove - Remove a tag. 356 * @c: Client session. 357 * @r: Request of reference. 358 * 359 * Context: Any context. 360 */ 361 static void p9_tag_remove(struct p9_client *c, struct p9_req_t *r) 362 { 363 unsigned long flags; 364 u16 tag = r->tc.tag; 365 366 p9_debug(P9_DEBUG_MUX, "freeing clnt %p req %p tag: %d\n", c, r, tag); 367 spin_lock_irqsave(&c->lock, flags); 368 idr_remove(&c->reqs, tag); 369 spin_unlock_irqrestore(&c->lock, flags); 370 } 371 372 int p9_req_put(struct p9_client *c, struct p9_req_t *r) 373 { 374 if (refcount_dec_and_test(&r->refcount)) { 375 p9_tag_remove(c, r); 376 377 p9_fcall_fini(&r->tc); 378 p9_fcall_fini(&r->rc); 379 kmem_cache_free(p9_req_cache, r); 380 return 1; 381 } 382 return 0; 383 } 384 EXPORT_SYMBOL(p9_req_put); 385 386 /** 387 * p9_tag_cleanup - cleans up tags structure and reclaims resources 388 * @c: v9fs client struct 389 * 390 * This frees resources associated with the tags structure 391 * 392 */ 393 static void p9_tag_cleanup(struct p9_client *c) 394 { 395 struct p9_req_t *req; 396 int id; 397 398 rcu_read_lock(); 399 idr_for_each_entry(&c->reqs, req, id) { 400 pr_info("Tag %d still in use\n", id); 401 if (p9_req_put(c, req) == 0) 402 pr_warn("Packet with tag %d has still references", 403 req->tc.tag); 404 } 405 rcu_read_unlock(); 406 } 407 408 /** 409 * p9_client_cb - call back from transport to client 410 * @c: client state 411 * @req: request received 412 * @status: request status, one of REQ_STATUS_* 413 * 414 */ 415 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) 416 { 417 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); 418 419 /* This barrier is needed to make sure any change made to req before 420 * the status change is visible to another thread 421 */ 422 smp_wmb(); 423 req->status = status; 424 425 wake_up(&req->wq); 426 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); 427 p9_req_put(c, req); 428 } 429 EXPORT_SYMBOL(p9_client_cb); 430 431 /** 432 * p9_parse_header - parse header arguments out of a packet 433 * @pdu: packet to parse 434 * @size: size of packet 435 * @type: type of request 436 * @tag: tag of packet 437 * @rewind: set if we need to rewind offset afterwards 438 */ 439 440 int 441 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, 442 int16_t *tag, int rewind) 443 { 444 s8 r_type; 445 s16 r_tag; 446 s32 r_size; 447 int offset = pdu->offset; 448 int err; 449 450 pdu->offset = 0; 451 452 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 453 if (err) 454 goto rewind_and_exit; 455 456 if (type) 457 *type = r_type; 458 if (tag) 459 *tag = r_tag; 460 if (size) 461 *size = r_size; 462 463 if (pdu->size != r_size || r_size < 7) { 464 err = -EINVAL; 465 goto rewind_and_exit; 466 } 467 468 pdu->id = r_type; 469 pdu->tag = r_tag; 470 471 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 472 pdu->size, pdu->id, pdu->tag); 473 474 rewind_and_exit: 475 if (rewind) 476 pdu->offset = offset; 477 return err; 478 } 479 EXPORT_SYMBOL(p9_parse_header); 480 481 /** 482 * p9_check_errors - check 9p packet for error return and process it 483 * @c: current client instance 484 * @req: request to parse and check for error conditions 485 * 486 * returns error code if one is discovered, otherwise returns 0 487 * 488 * this will have to be more complicated if we have multiple 489 * error packet types 490 */ 491 492 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 493 { 494 s8 type; 495 int err; 496 int ecode; 497 498 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 499 if (req->rc.size >= c->msize) { 500 p9_debug(P9_DEBUG_ERROR, 501 "requested packet size too big: %d\n", 502 req->rc.size); 503 return -EIO; 504 } 505 /* dump the response from server 506 * This should be after check errors which poplulate pdu_fcall. 507 */ 508 trace_9p_protocol_dump(c, &req->rc); 509 if (err) { 510 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 511 return err; 512 } 513 if (type != P9_RERROR && type != P9_RLERROR) 514 return 0; 515 516 if (!p9_is_proto_dotl(c)) { 517 char *ename; 518 519 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 520 &ename, &ecode); 521 if (err) 522 goto out_err; 523 524 if (p9_is_proto_dotu(c) && ecode < 512) 525 err = -ecode; 526 527 if (!err) { 528 err = p9_errstr2errno(ename, strlen(ename)); 529 530 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 531 -ecode, ename); 532 } 533 kfree(ename); 534 } else { 535 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 536 if (err) 537 goto out_err; 538 err = -ecode; 539 540 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 541 } 542 543 return err; 544 545 out_err: 546 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 547 548 return err; 549 } 550 551 /** 552 * p9_check_zc_errors - check 9p packet for error return and process it 553 * @c: current client instance 554 * @req: request to parse and check for error conditions 555 * @uidata: external buffer containing error 556 * @in_hdrlen: Size of response protocol buffer. 557 * 558 * returns error code if one is discovered, otherwise returns 0 559 * 560 * this will have to be more complicated if we have multiple 561 * error packet types 562 */ 563 564 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req, 565 struct iov_iter *uidata, int in_hdrlen) 566 { 567 int err; 568 int ecode; 569 s8 type; 570 char *ename = NULL; 571 572 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 573 /* dump the response from server 574 * This should be after parse_header which poplulate pdu_fcall. 575 */ 576 trace_9p_protocol_dump(c, &req->rc); 577 if (err) { 578 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 579 return err; 580 } 581 582 if (type != P9_RERROR && type != P9_RLERROR) 583 return 0; 584 585 if (!p9_is_proto_dotl(c)) { 586 /* Error is reported in string format */ 587 int len; 588 /* 7 = header size for RERROR; */ 589 int inline_len = in_hdrlen - 7; 590 591 len = req->rc.size - req->rc.offset; 592 if (len > (P9_ZC_HDR_SZ - 7)) { 593 err = -EFAULT; 594 goto out_err; 595 } 596 597 ename = &req->rc.sdata[req->rc.offset]; 598 if (len > inline_len) { 599 /* We have error in external buffer */ 600 if (!copy_from_iter_full(ename + inline_len, 601 len - inline_len, uidata)) { 602 err = -EFAULT; 603 goto out_err; 604 } 605 } 606 ename = NULL; 607 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 608 &ename, &ecode); 609 if (err) 610 goto out_err; 611 612 if (p9_is_proto_dotu(c) && ecode < 512) 613 err = -ecode; 614 615 if (!err) { 616 err = p9_errstr2errno(ename, strlen(ename)); 617 618 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 619 -ecode, ename); 620 } 621 kfree(ename); 622 } else { 623 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 624 err = -ecode; 625 626 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 627 } 628 return err; 629 630 out_err: 631 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 632 return err; 633 } 634 635 static struct p9_req_t * 636 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 637 638 /** 639 * p9_client_flush - flush (cancel) a request 640 * @c: client state 641 * @oldreq: request to cancel 642 * 643 * This sents a flush for a particular request and links 644 * the flush request to the original request. The current 645 * code only supports a single flush request although the protocol 646 * allows for multiple flush requests to be sent for a single request. 647 * 648 */ 649 650 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 651 { 652 struct p9_req_t *req; 653 s16 oldtag; 654 int err; 655 656 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); 657 if (err) 658 return err; 659 660 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 661 662 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 663 if (IS_ERR(req)) 664 return PTR_ERR(req); 665 666 /* if we haven't received a response for oldreq, 667 * remove it from the list 668 */ 669 if (oldreq->status == REQ_STATUS_SENT) { 670 if (c->trans_mod->cancelled) 671 c->trans_mod->cancelled(c, oldreq); 672 } 673 674 p9_req_put(c, req); 675 return 0; 676 } 677 678 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 679 int8_t type, int req_size, 680 const char *fmt, va_list ap) 681 { 682 int err; 683 struct p9_req_t *req; 684 685 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 686 687 /* we allow for any status other than disconnected */ 688 if (c->status == Disconnected) 689 return ERR_PTR(-EIO); 690 691 /* if status is begin_disconnected we allow only clunk request */ 692 if (c->status == BeginDisconnect && type != P9_TCLUNK) 693 return ERR_PTR(-EIO); 694 695 req = p9_tag_alloc(c, type, req_size); 696 if (IS_ERR(req)) 697 return req; 698 699 /* marshall the data */ 700 p9pdu_prepare(&req->tc, req->tc.tag, type); 701 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); 702 if (err) 703 goto reterr; 704 p9pdu_finalize(c, &req->tc); 705 trace_9p_client_req(c, type, req->tc.tag); 706 return req; 707 reterr: 708 p9_req_put(c, req); 709 /* We have to put also the 2nd reference as it won't be used */ 710 p9_req_put(c, req); 711 return ERR_PTR(err); 712 } 713 714 /** 715 * p9_client_rpc - issue a request and wait for a response 716 * @c: client session 717 * @type: type of request 718 * @fmt: protocol format string (see protocol.c) 719 * 720 * Returns request structure (which client must free using p9_req_put) 721 */ 722 723 static struct p9_req_t * 724 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 725 { 726 va_list ap; 727 int sigpending, err; 728 unsigned long flags; 729 struct p9_req_t *req; 730 731 va_start(ap, fmt); 732 req = p9_client_prepare_req(c, type, c->msize, fmt, ap); 733 va_end(ap); 734 if (IS_ERR(req)) 735 return req; 736 737 if (signal_pending(current)) { 738 sigpending = 1; 739 clear_thread_flag(TIF_SIGPENDING); 740 } else { 741 sigpending = 0; 742 } 743 744 err = c->trans_mod->request(c, req); 745 if (err < 0) { 746 /* write won't happen */ 747 p9_req_put(c, req); 748 if (err != -ERESTARTSYS && err != -EFAULT) 749 c->status = Disconnected; 750 goto recalc_sigpending; 751 } 752 again: 753 /* Wait for the response */ 754 err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD); 755 756 /* Make sure our req is coherent with regard to updates in other 757 * threads - echoes to wmb() in the callback 758 */ 759 smp_rmb(); 760 761 if (err == -ERESTARTSYS && c->status == Connected && 762 type == P9_TFLUSH) { 763 sigpending = 1; 764 clear_thread_flag(TIF_SIGPENDING); 765 goto again; 766 } 767 768 if (req->status == REQ_STATUS_ERROR) { 769 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 770 err = req->t_err; 771 } 772 if (err == -ERESTARTSYS && c->status == Connected) { 773 p9_debug(P9_DEBUG_MUX, "flushing\n"); 774 sigpending = 1; 775 clear_thread_flag(TIF_SIGPENDING); 776 777 if (c->trans_mod->cancel(c, req)) 778 p9_client_flush(c, req); 779 780 /* if we received the response anyway, don't signal error */ 781 if (req->status == REQ_STATUS_RCVD) 782 err = 0; 783 } 784 recalc_sigpending: 785 if (sigpending) { 786 spin_lock_irqsave(¤t->sighand->siglock, flags); 787 recalc_sigpending(); 788 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 789 } 790 if (err < 0) 791 goto reterr; 792 793 err = p9_check_errors(c, req); 794 trace_9p_client_res(c, type, req->rc.tag, err); 795 if (!err) 796 return req; 797 reterr: 798 p9_req_put(c, req); 799 return ERR_PTR(safe_errno(err)); 800 } 801 802 /** 803 * p9_client_zc_rpc - issue a request and wait for a response 804 * @c: client session 805 * @type: type of request 806 * @uidata: destination for zero copy read 807 * @uodata: source for zero copy write 808 * @inlen: read buffer size 809 * @olen: write buffer size 810 * @in_hdrlen: reader header size, This is the size of response protocol data 811 * @fmt: protocol format string (see protocol.c) 812 * 813 * Returns request structure (which client must free using p9_req_put) 814 */ 815 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 816 struct iov_iter *uidata, 817 struct iov_iter *uodata, 818 int inlen, int olen, int in_hdrlen, 819 const char *fmt, ...) 820 { 821 va_list ap; 822 int sigpending, err; 823 unsigned long flags; 824 struct p9_req_t *req; 825 826 va_start(ap, fmt); 827 /* We allocate a inline protocol data of only 4k bytes. 828 * The actual content is passed in zero-copy fashion. 829 */ 830 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); 831 va_end(ap); 832 if (IS_ERR(req)) 833 return req; 834 835 if (signal_pending(current)) { 836 sigpending = 1; 837 clear_thread_flag(TIF_SIGPENDING); 838 } else { 839 sigpending = 0; 840 } 841 842 err = c->trans_mod->zc_request(c, req, uidata, uodata, 843 inlen, olen, in_hdrlen); 844 if (err < 0) { 845 if (err == -EIO) 846 c->status = Disconnected; 847 if (err != -ERESTARTSYS) 848 goto recalc_sigpending; 849 } 850 if (req->status == REQ_STATUS_ERROR) { 851 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 852 err = req->t_err; 853 } 854 if (err == -ERESTARTSYS && c->status == Connected) { 855 p9_debug(P9_DEBUG_MUX, "flushing\n"); 856 sigpending = 1; 857 clear_thread_flag(TIF_SIGPENDING); 858 859 if (c->trans_mod->cancel(c, req)) 860 p9_client_flush(c, req); 861 862 /* if we received the response anyway, don't signal error */ 863 if (req->status == REQ_STATUS_RCVD) 864 err = 0; 865 } 866 recalc_sigpending: 867 if (sigpending) { 868 spin_lock_irqsave(¤t->sighand->siglock, flags); 869 recalc_sigpending(); 870 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 871 } 872 if (err < 0) 873 goto reterr; 874 875 err = p9_check_zc_errors(c, req, uidata, in_hdrlen); 876 trace_9p_client_res(c, type, req->rc.tag, err); 877 if (!err) 878 return req; 879 reterr: 880 p9_req_put(c, req); 881 return ERR_PTR(safe_errno(err)); 882 } 883 884 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 885 { 886 int ret; 887 struct p9_fid *fid; 888 889 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 890 fid = kmalloc(sizeof(*fid), GFP_KERNEL); 891 if (!fid) 892 return NULL; 893 894 memset(&fid->qid, 0, sizeof(fid->qid)); 895 fid->mode = -1; 896 fid->uid = current_fsuid(); 897 fid->clnt = clnt; 898 fid->rdir = NULL; 899 fid->fid = 0; 900 refcount_set(&fid->count, 1); 901 902 idr_preload(GFP_KERNEL); 903 spin_lock_irq(&clnt->lock); 904 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, 905 GFP_NOWAIT); 906 spin_unlock_irq(&clnt->lock); 907 idr_preload_end(); 908 if (!ret) { 909 trace_9p_fid_ref(fid, P9_FID_REF_CREATE); 910 return fid; 911 } 912 913 kfree(fid); 914 return NULL; 915 } 916 917 static void p9_fid_destroy(struct p9_fid *fid) 918 { 919 struct p9_client *clnt; 920 unsigned long flags; 921 922 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 923 trace_9p_fid_ref(fid, P9_FID_REF_DESTROY); 924 clnt = fid->clnt; 925 spin_lock_irqsave(&clnt->lock, flags); 926 idr_remove(&clnt->fids, fid->fid); 927 spin_unlock_irqrestore(&clnt->lock, flags); 928 kfree(fid->rdir); 929 kfree(fid); 930 } 931 932 /* We also need to export tracepoint symbols for tracepoint_enabled() */ 933 EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref); 934 935 void do_trace_9p_fid_get(struct p9_fid *fid) 936 { 937 trace_9p_fid_ref(fid, P9_FID_REF_GET); 938 } 939 EXPORT_SYMBOL(do_trace_9p_fid_get); 940 941 void do_trace_9p_fid_put(struct p9_fid *fid) 942 { 943 trace_9p_fid_ref(fid, P9_FID_REF_PUT); 944 } 945 EXPORT_SYMBOL(do_trace_9p_fid_put); 946 947 static int p9_client_version(struct p9_client *c) 948 { 949 int err = 0; 950 struct p9_req_t *req; 951 char *version = NULL; 952 int msize; 953 954 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 955 c->msize, c->proto_version); 956 957 switch (c->proto_version) { 958 case p9_proto_2000L: 959 req = p9_client_rpc(c, P9_TVERSION, "ds", 960 c->msize, "9P2000.L"); 961 break; 962 case p9_proto_2000u: 963 req = p9_client_rpc(c, P9_TVERSION, "ds", 964 c->msize, "9P2000.u"); 965 break; 966 case p9_proto_legacy: 967 req = p9_client_rpc(c, P9_TVERSION, "ds", 968 c->msize, "9P2000"); 969 break; 970 default: 971 return -EINVAL; 972 } 973 974 if (IS_ERR(req)) 975 return PTR_ERR(req); 976 977 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); 978 if (err) { 979 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 980 trace_9p_protocol_dump(c, &req->rc); 981 goto error; 982 } 983 984 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 985 if (!strncmp(version, "9P2000.L", 8)) { 986 c->proto_version = p9_proto_2000L; 987 } else if (!strncmp(version, "9P2000.u", 8)) { 988 c->proto_version = p9_proto_2000u; 989 } else if (!strncmp(version, "9P2000", 6)) { 990 c->proto_version = p9_proto_legacy; 991 } else { 992 p9_debug(P9_DEBUG_ERROR, 993 "server returned an unknown version: %s\n", version); 994 err = -EREMOTEIO; 995 goto error; 996 } 997 998 if (msize < 4096) { 999 p9_debug(P9_DEBUG_ERROR, 1000 "server returned a msize < 4096: %d\n", msize); 1001 err = -EREMOTEIO; 1002 goto error; 1003 } 1004 if (msize < c->msize) 1005 c->msize = msize; 1006 1007 error: 1008 kfree(version); 1009 p9_req_put(c, req); 1010 1011 return err; 1012 } 1013 1014 struct p9_client *p9_client_create(const char *dev_name, char *options) 1015 { 1016 int err; 1017 struct p9_client *clnt; 1018 char *client_id; 1019 1020 err = 0; 1021 clnt = kmalloc(sizeof(*clnt), GFP_KERNEL); 1022 if (!clnt) 1023 return ERR_PTR(-ENOMEM); 1024 1025 clnt->trans_mod = NULL; 1026 clnt->trans = NULL; 1027 clnt->fcall_cache = NULL; 1028 1029 client_id = utsname()->nodename; 1030 memcpy(clnt->name, client_id, strlen(client_id) + 1); 1031 1032 spin_lock_init(&clnt->lock); 1033 idr_init(&clnt->fids); 1034 idr_init(&clnt->reqs); 1035 1036 err = parse_opts(options, clnt); 1037 if (err < 0) 1038 goto free_client; 1039 1040 if (!clnt->trans_mod) 1041 clnt->trans_mod = v9fs_get_default_trans(); 1042 1043 if (!clnt->trans_mod) { 1044 err = -EPROTONOSUPPORT; 1045 p9_debug(P9_DEBUG_ERROR, 1046 "No transport defined or default transport\n"); 1047 goto free_client; 1048 } 1049 1050 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1051 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1052 1053 err = clnt->trans_mod->create(clnt, dev_name, options); 1054 if (err) 1055 goto put_trans; 1056 1057 if (clnt->msize > clnt->trans_mod->maxsize) { 1058 clnt->msize = clnt->trans_mod->maxsize; 1059 pr_info("Limiting 'msize' to %d as this is the maximum " 1060 "supported by transport %s\n", 1061 clnt->msize, clnt->trans_mod->name 1062 ); 1063 } 1064 1065 if (clnt->msize < 4096) { 1066 p9_debug(P9_DEBUG_ERROR, 1067 "Please specify a msize of at least 4k\n"); 1068 err = -EINVAL; 1069 goto close_trans; 1070 } 1071 1072 err = p9_client_version(clnt); 1073 if (err) 1074 goto close_trans; 1075 1076 /* P9_HDRSZ + 4 is the smallest packet header we can have that is 1077 * followed by data accessed from userspace by read 1078 */ 1079 clnt->fcall_cache = 1080 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, 1081 0, 0, P9_HDRSZ + 4, 1082 clnt->msize - (P9_HDRSZ + 4), 1083 NULL); 1084 1085 return clnt; 1086 1087 close_trans: 1088 clnt->trans_mod->close(clnt); 1089 put_trans: 1090 v9fs_put_trans(clnt->trans_mod); 1091 free_client: 1092 kfree(clnt); 1093 return ERR_PTR(err); 1094 } 1095 EXPORT_SYMBOL(p9_client_create); 1096 1097 void p9_client_destroy(struct p9_client *clnt) 1098 { 1099 struct p9_fid *fid; 1100 int id; 1101 1102 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1103 1104 if (clnt->trans_mod) 1105 clnt->trans_mod->close(clnt); 1106 1107 v9fs_put_trans(clnt->trans_mod); 1108 1109 idr_for_each_entry(&clnt->fids, fid, id) { 1110 pr_info("Found fid %d not clunked\n", fid->fid); 1111 p9_fid_destroy(fid); 1112 } 1113 1114 p9_tag_cleanup(clnt); 1115 1116 kmem_cache_destroy(clnt->fcall_cache); 1117 kfree(clnt); 1118 } 1119 EXPORT_SYMBOL(p9_client_destroy); 1120 1121 void p9_client_disconnect(struct p9_client *clnt) 1122 { 1123 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1124 clnt->status = Disconnected; 1125 } 1126 EXPORT_SYMBOL(p9_client_disconnect); 1127 1128 void p9_client_begin_disconnect(struct p9_client *clnt) 1129 { 1130 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1131 clnt->status = BeginDisconnect; 1132 } 1133 EXPORT_SYMBOL(p9_client_begin_disconnect); 1134 1135 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1136 const char *uname, kuid_t n_uname, 1137 const char *aname) 1138 { 1139 int err = 0; 1140 struct p9_req_t *req; 1141 struct p9_fid *fid; 1142 struct p9_qid qid; 1143 1144 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1145 afid ? afid->fid : -1, uname, aname); 1146 fid = p9_fid_create(clnt); 1147 if (!fid) { 1148 err = -ENOMEM; 1149 goto error; 1150 } 1151 fid->uid = n_uname; 1152 1153 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1154 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1155 if (IS_ERR(req)) { 1156 err = PTR_ERR(req); 1157 goto error; 1158 } 1159 1160 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); 1161 if (err) { 1162 trace_9p_protocol_dump(clnt, &req->rc); 1163 p9_req_put(clnt, req); 1164 goto error; 1165 } 1166 1167 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1168 qid.type, qid.path, qid.version); 1169 1170 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1171 1172 p9_req_put(clnt, req); 1173 return fid; 1174 1175 error: 1176 if (fid) 1177 p9_fid_destroy(fid); 1178 return ERR_PTR(err); 1179 } 1180 EXPORT_SYMBOL(p9_client_attach); 1181 1182 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1183 const unsigned char * const *wnames, int clone) 1184 { 1185 int err; 1186 struct p9_client *clnt; 1187 struct p9_fid *fid; 1188 struct p9_qid *wqids; 1189 struct p9_req_t *req; 1190 u16 nwqids, count; 1191 1192 err = 0; 1193 wqids = NULL; 1194 clnt = oldfid->clnt; 1195 if (clone) { 1196 fid = p9_fid_create(clnt); 1197 if (!fid) { 1198 err = -ENOMEM; 1199 goto error; 1200 } 1201 1202 fid->uid = oldfid->uid; 1203 } else { 1204 fid = oldfid; 1205 } 1206 1207 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1208 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1209 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1210 nwname, wnames); 1211 if (IS_ERR(req)) { 1212 err = PTR_ERR(req); 1213 goto error; 1214 } 1215 1216 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1217 if (err) { 1218 trace_9p_protocol_dump(clnt, &req->rc); 1219 p9_req_put(clnt, req); 1220 goto clunk_fid; 1221 } 1222 p9_req_put(clnt, req); 1223 1224 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1225 1226 if (nwqids != nwname) { 1227 err = -ENOENT; 1228 goto clunk_fid; 1229 } 1230 1231 for (count = 0; count < nwqids; count++) 1232 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1233 count, wqids[count].type, 1234 wqids[count].path, 1235 wqids[count].version); 1236 1237 if (nwname) 1238 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1239 else 1240 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); 1241 1242 kfree(wqids); 1243 return fid; 1244 1245 clunk_fid: 1246 kfree(wqids); 1247 p9_fid_put(fid); 1248 fid = NULL; 1249 1250 error: 1251 if (fid && fid != oldfid) 1252 p9_fid_destroy(fid); 1253 1254 return ERR_PTR(err); 1255 } 1256 EXPORT_SYMBOL(p9_client_walk); 1257 1258 int p9_client_open(struct p9_fid *fid, int mode) 1259 { 1260 int err; 1261 struct p9_client *clnt; 1262 struct p9_req_t *req; 1263 struct p9_qid qid; 1264 int iounit; 1265 1266 clnt = fid->clnt; 1267 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1268 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1269 err = 0; 1270 1271 if (fid->mode != -1) 1272 return -EINVAL; 1273 1274 if (p9_is_proto_dotl(clnt)) 1275 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1276 else 1277 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1278 if (IS_ERR(req)) { 1279 err = PTR_ERR(req); 1280 goto error; 1281 } 1282 1283 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1284 if (err) { 1285 trace_9p_protocol_dump(clnt, &req->rc); 1286 goto free_and_error; 1287 } 1288 1289 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1290 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1291 qid.path, qid.version, iounit); 1292 1293 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1294 fid->mode = mode; 1295 fid->iounit = iounit; 1296 1297 free_and_error: 1298 p9_req_put(clnt, req); 1299 error: 1300 return err; 1301 } 1302 EXPORT_SYMBOL(p9_client_open); 1303 1304 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, 1305 u32 mode, kgid_t gid, struct p9_qid *qid) 1306 { 1307 int err = 0; 1308 struct p9_client *clnt; 1309 struct p9_req_t *req; 1310 int iounit; 1311 1312 p9_debug(P9_DEBUG_9P, 1313 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1314 ofid->fid, name, flags, mode, 1315 from_kgid(&init_user_ns, gid)); 1316 clnt = ofid->clnt; 1317 1318 if (ofid->mode != -1) 1319 return -EINVAL; 1320 1321 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1322 mode, gid); 1323 if (IS_ERR(req)) { 1324 err = PTR_ERR(req); 1325 goto error; 1326 } 1327 1328 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); 1329 if (err) { 1330 trace_9p_protocol_dump(clnt, &req->rc); 1331 goto free_and_error; 1332 } 1333 1334 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1335 qid->type, qid->path, qid->version, iounit); 1336 1337 memmove(&ofid->qid, qid, sizeof(struct p9_qid)); 1338 ofid->mode = mode; 1339 ofid->iounit = iounit; 1340 1341 free_and_error: 1342 p9_req_put(clnt, req); 1343 error: 1344 return err; 1345 } 1346 EXPORT_SYMBOL(p9_client_create_dotl); 1347 1348 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1349 char *extension) 1350 { 1351 int err; 1352 struct p9_client *clnt; 1353 struct p9_req_t *req; 1354 struct p9_qid qid; 1355 int iounit; 1356 1357 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1358 fid->fid, name, perm, mode); 1359 err = 0; 1360 clnt = fid->clnt; 1361 1362 if (fid->mode != -1) 1363 return -EINVAL; 1364 1365 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1366 mode, extension); 1367 if (IS_ERR(req)) { 1368 err = PTR_ERR(req); 1369 goto error; 1370 } 1371 1372 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1373 if (err) { 1374 trace_9p_protocol_dump(clnt, &req->rc); 1375 goto free_and_error; 1376 } 1377 1378 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1379 qid.type, qid.path, qid.version, iounit); 1380 1381 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1382 fid->mode = mode; 1383 fid->iounit = iounit; 1384 1385 free_and_error: 1386 p9_req_put(clnt, req); 1387 error: 1388 return err; 1389 } 1390 EXPORT_SYMBOL(p9_client_fcreate); 1391 1392 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1393 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1394 { 1395 int err = 0; 1396 struct p9_client *clnt; 1397 struct p9_req_t *req; 1398 1399 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1400 dfid->fid, name, symtgt); 1401 clnt = dfid->clnt; 1402 1403 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1404 gid); 1405 if (IS_ERR(req)) { 1406 err = PTR_ERR(req); 1407 goto error; 1408 } 1409 1410 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 1411 if (err) { 1412 trace_9p_protocol_dump(clnt, &req->rc); 1413 goto free_and_error; 1414 } 1415 1416 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1417 qid->type, qid->path, qid->version); 1418 1419 free_and_error: 1420 p9_req_put(clnt, req); 1421 error: 1422 return err; 1423 } 1424 EXPORT_SYMBOL(p9_client_symlink); 1425 1426 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1427 { 1428 struct p9_client *clnt; 1429 struct p9_req_t *req; 1430 1431 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1432 dfid->fid, oldfid->fid, newname); 1433 clnt = dfid->clnt; 1434 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1435 newname); 1436 if (IS_ERR(req)) 1437 return PTR_ERR(req); 1438 1439 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1440 p9_req_put(clnt, req); 1441 return 0; 1442 } 1443 EXPORT_SYMBOL(p9_client_link); 1444 1445 int p9_client_fsync(struct p9_fid *fid, int datasync) 1446 { 1447 int err; 1448 struct p9_client *clnt; 1449 struct p9_req_t *req; 1450 1451 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1452 fid->fid, datasync); 1453 err = 0; 1454 clnt = fid->clnt; 1455 1456 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1457 if (IS_ERR(req)) { 1458 err = PTR_ERR(req); 1459 goto error; 1460 } 1461 1462 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1463 1464 p9_req_put(clnt, req); 1465 1466 error: 1467 return err; 1468 } 1469 EXPORT_SYMBOL(p9_client_fsync); 1470 1471 int p9_client_clunk(struct p9_fid *fid) 1472 { 1473 int err; 1474 struct p9_client *clnt; 1475 struct p9_req_t *req; 1476 int retries = 0; 1477 1478 again: 1479 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", 1480 fid->fid, retries); 1481 err = 0; 1482 clnt = fid->clnt; 1483 1484 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1485 if (IS_ERR(req)) { 1486 err = PTR_ERR(req); 1487 goto error; 1488 } 1489 1490 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1491 1492 p9_req_put(clnt, req); 1493 error: 1494 /* Fid is not valid even after a failed clunk 1495 * If interrupted, retry once then give up and 1496 * leak fid until umount. 1497 */ 1498 if (err == -ERESTARTSYS) { 1499 if (retries++ == 0) 1500 goto again; 1501 } else { 1502 p9_fid_destroy(fid); 1503 } 1504 return err; 1505 } 1506 EXPORT_SYMBOL(p9_client_clunk); 1507 1508 int p9_client_remove(struct p9_fid *fid) 1509 { 1510 int err; 1511 struct p9_client *clnt; 1512 struct p9_req_t *req; 1513 1514 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1515 err = 0; 1516 clnt = fid->clnt; 1517 1518 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1519 if (IS_ERR(req)) { 1520 err = PTR_ERR(req); 1521 goto error; 1522 } 1523 1524 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1525 1526 p9_req_put(clnt, req); 1527 error: 1528 if (err == -ERESTARTSYS) 1529 p9_fid_put(fid); 1530 else 1531 p9_fid_destroy(fid); 1532 return err; 1533 } 1534 EXPORT_SYMBOL(p9_client_remove); 1535 1536 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1537 { 1538 int err = 0; 1539 struct p9_req_t *req; 1540 struct p9_client *clnt; 1541 1542 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1543 dfid->fid, name, flags); 1544 1545 clnt = dfid->clnt; 1546 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1547 if (IS_ERR(req)) { 1548 err = PTR_ERR(req); 1549 goto error; 1550 } 1551 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1552 1553 p9_req_put(clnt, req); 1554 error: 1555 return err; 1556 } 1557 EXPORT_SYMBOL(p9_client_unlinkat); 1558 1559 int 1560 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1561 { 1562 int total = 0; 1563 *err = 0; 1564 1565 while (iov_iter_count(to)) { 1566 int count; 1567 1568 count = p9_client_read_once(fid, offset, to, err); 1569 if (!count || *err) 1570 break; 1571 offset += count; 1572 total += count; 1573 } 1574 return total; 1575 } 1576 EXPORT_SYMBOL(p9_client_read); 1577 1578 int 1579 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, 1580 int *err) 1581 { 1582 struct p9_client *clnt = fid->clnt; 1583 struct p9_req_t *req; 1584 int count = iov_iter_count(to); 1585 int rsize, non_zc = 0; 1586 char *dataptr; 1587 1588 *err = 0; 1589 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n", 1590 fid->fid, offset, iov_iter_count(to)); 1591 1592 rsize = fid->iounit; 1593 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1594 rsize = clnt->msize - P9_IOHDRSZ; 1595 1596 if (count < rsize) 1597 rsize = count; 1598 1599 /* Don't bother zerocopy for small IO (< 1024) */ 1600 if (clnt->trans_mod->zc_request && rsize > 1024) { 1601 /* response header len is 11 1602 * PDU Header(7) + IO Size (4) 1603 */ 1604 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1605 0, 11, "dqd", fid->fid, 1606 offset, rsize); 1607 } else { 1608 non_zc = 1; 1609 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1610 rsize); 1611 } 1612 if (IS_ERR(req)) { 1613 *err = PTR_ERR(req); 1614 return 0; 1615 } 1616 1617 *err = p9pdu_readf(&req->rc, clnt->proto_version, 1618 "D", &count, &dataptr); 1619 if (*err) { 1620 trace_9p_protocol_dump(clnt, &req->rc); 1621 p9_req_put(clnt, req); 1622 return 0; 1623 } 1624 if (rsize < count) { 1625 pr_err("bogus RREAD count (%d > %d)\n", count, rsize); 1626 count = rsize; 1627 } 1628 1629 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1630 1631 if (non_zc) { 1632 int n = copy_to_iter(dataptr, count, to); 1633 1634 if (n != count) { 1635 *err = -EFAULT; 1636 p9_req_put(clnt, req); 1637 return n; 1638 } 1639 } else { 1640 iov_iter_advance(to, count); 1641 } 1642 p9_req_put(clnt, req); 1643 return count; 1644 } 1645 EXPORT_SYMBOL(p9_client_read_once); 1646 1647 int 1648 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1649 { 1650 struct p9_client *clnt = fid->clnt; 1651 struct p9_req_t *req; 1652 int total = 0; 1653 *err = 0; 1654 1655 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", 1656 fid->fid, offset, iov_iter_count(from)); 1657 1658 while (iov_iter_count(from)) { 1659 int count = iov_iter_count(from); 1660 int rsize = fid->iounit; 1661 1662 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1663 rsize = clnt->msize - P9_IOHDRSZ; 1664 1665 if (count < rsize) 1666 rsize = count; 1667 1668 /* Don't bother zerocopy for small IO (< 1024) */ 1669 if (clnt->trans_mod->zc_request && rsize > 1024) { 1670 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1671 rsize, P9_ZC_HDR_SZ, "dqd", 1672 fid->fid, offset, rsize); 1673 } else { 1674 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1675 offset, rsize, from); 1676 } 1677 if (IS_ERR(req)) { 1678 *err = PTR_ERR(req); 1679 break; 1680 } 1681 1682 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count); 1683 if (*err) { 1684 trace_9p_protocol_dump(clnt, &req->rc); 1685 p9_req_put(clnt, req); 1686 break; 1687 } 1688 if (rsize < count) { 1689 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize); 1690 count = rsize; 1691 } 1692 1693 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1694 1695 p9_req_put(clnt, req); 1696 iov_iter_advance(from, count); 1697 total += count; 1698 offset += count; 1699 } 1700 return total; 1701 } 1702 EXPORT_SYMBOL(p9_client_write); 1703 1704 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1705 { 1706 int err; 1707 struct p9_client *clnt; 1708 struct p9_wstat *ret; 1709 struct p9_req_t *req; 1710 u16 ignored; 1711 1712 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1713 1714 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1715 if (!ret) 1716 return ERR_PTR(-ENOMEM); 1717 1718 err = 0; 1719 clnt = fid->clnt; 1720 1721 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1722 if (IS_ERR(req)) { 1723 err = PTR_ERR(req); 1724 goto error; 1725 } 1726 1727 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); 1728 if (err) { 1729 trace_9p_protocol_dump(clnt, &req->rc); 1730 p9_req_put(clnt, req); 1731 goto error; 1732 } 1733 1734 p9_debug(P9_DEBUG_9P, 1735 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1736 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1737 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1738 "<<< uid=%d gid=%d n_muid=%d\n", 1739 ret->size, ret->type, ret->dev, ret->qid.type, ret->qid.path, 1740 ret->qid.version, ret->mode, 1741 ret->atime, ret->mtime, ret->length, 1742 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1743 from_kuid(&init_user_ns, ret->n_uid), 1744 from_kgid(&init_user_ns, ret->n_gid), 1745 from_kuid(&init_user_ns, ret->n_muid)); 1746 1747 p9_req_put(clnt, req); 1748 return ret; 1749 1750 error: 1751 kfree(ret); 1752 return ERR_PTR(err); 1753 } 1754 EXPORT_SYMBOL(p9_client_stat); 1755 1756 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1757 u64 request_mask) 1758 { 1759 int err; 1760 struct p9_client *clnt; 1761 struct p9_stat_dotl *ret; 1762 struct p9_req_t *req; 1763 1764 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1765 fid->fid, request_mask); 1766 1767 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1768 if (!ret) 1769 return ERR_PTR(-ENOMEM); 1770 1771 err = 0; 1772 clnt = fid->clnt; 1773 1774 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1775 if (IS_ERR(req)) { 1776 err = PTR_ERR(req); 1777 goto error; 1778 } 1779 1780 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); 1781 if (err) { 1782 trace_9p_protocol_dump(clnt, &req->rc); 1783 p9_req_put(clnt, req); 1784 goto error; 1785 } 1786 1787 p9_debug(P9_DEBUG_9P, "<<< RGETATTR st_result_mask=%lld\n" 1788 "<<< qid=%x.%llx.%x\n" 1789 "<<< st_mode=%8.8x st_nlink=%llu\n" 1790 "<<< st_uid=%d st_gid=%d\n" 1791 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1792 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1793 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1794 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1795 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1796 "<<< st_gen=%lld st_data_version=%lld\n", 1797 ret->st_result_mask, 1798 ret->qid.type, ret->qid.path, ret->qid.version, 1799 ret->st_mode, ret->st_nlink, 1800 from_kuid(&init_user_ns, ret->st_uid), 1801 from_kgid(&init_user_ns, ret->st_gid), 1802 ret->st_rdev, ret->st_size, ret->st_blksize, ret->st_blocks, 1803 ret->st_atime_sec, ret->st_atime_nsec, 1804 ret->st_mtime_sec, ret->st_mtime_nsec, 1805 ret->st_ctime_sec, ret->st_ctime_nsec, 1806 ret->st_btime_sec, ret->st_btime_nsec, 1807 ret->st_gen, ret->st_data_version); 1808 1809 p9_req_put(clnt, req); 1810 return ret; 1811 1812 error: 1813 kfree(ret); 1814 return ERR_PTR(err); 1815 } 1816 EXPORT_SYMBOL(p9_client_getattr_dotl); 1817 1818 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1819 { 1820 int ret; 1821 1822 /* NOTE: size shouldn't include its own length */ 1823 /* size[2] type[2] dev[4] qid[13] */ 1824 /* mode[4] atime[4] mtime[4] length[8]*/ 1825 /* name[s] uid[s] gid[s] muid[s] */ 1826 ret = 2 + 4 + 13 + 4 + 4 + 4 + 8 + 2 + 2 + 2 + 2; 1827 1828 if (wst->name) 1829 ret += strlen(wst->name); 1830 if (wst->uid) 1831 ret += strlen(wst->uid); 1832 if (wst->gid) 1833 ret += strlen(wst->gid); 1834 if (wst->muid) 1835 ret += strlen(wst->muid); 1836 1837 if (proto_version == p9_proto_2000u || 1838 proto_version == p9_proto_2000L) { 1839 /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1840 ret += 2 + 4 + 4 + 4; 1841 if (wst->extension) 1842 ret += strlen(wst->extension); 1843 } 1844 1845 return ret; 1846 } 1847 1848 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1849 { 1850 int err; 1851 struct p9_req_t *req; 1852 struct p9_client *clnt; 1853 1854 err = 0; 1855 clnt = fid->clnt; 1856 wst->size = p9_client_statsize(wst, clnt->proto_version); 1857 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", 1858 fid->fid); 1859 p9_debug(P9_DEBUG_9P, 1860 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1861 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1862 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1863 " uid=%d gid=%d n_muid=%d\n", 1864 wst->size, wst->type, wst->dev, wst->qid.type, 1865 wst->qid.path, wst->qid.version, 1866 wst->mode, wst->atime, wst->mtime, wst->length, 1867 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1868 from_kuid(&init_user_ns, wst->n_uid), 1869 from_kgid(&init_user_ns, wst->n_gid), 1870 from_kuid(&init_user_ns, wst->n_muid)); 1871 1872 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", 1873 fid->fid, wst->size + 2, wst); 1874 if (IS_ERR(req)) { 1875 err = PTR_ERR(req); 1876 goto error; 1877 } 1878 1879 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1880 1881 p9_req_put(clnt, req); 1882 error: 1883 return err; 1884 } 1885 EXPORT_SYMBOL(p9_client_wstat); 1886 1887 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1888 { 1889 int err; 1890 struct p9_req_t *req; 1891 struct p9_client *clnt; 1892 1893 err = 0; 1894 clnt = fid->clnt; 1895 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1896 p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n", 1897 p9attr->valid, p9attr->mode, 1898 from_kuid(&init_user_ns, p9attr->uid), 1899 from_kgid(&init_user_ns, p9attr->gid), 1900 p9attr->size); 1901 p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n", 1902 p9attr->atime_sec, p9attr->atime_nsec); 1903 p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n", 1904 p9attr->mtime_sec, p9attr->mtime_nsec); 1905 1906 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1907 1908 if (IS_ERR(req)) { 1909 err = PTR_ERR(req); 1910 goto error; 1911 } 1912 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1913 p9_req_put(clnt, req); 1914 error: 1915 return err; 1916 } 1917 EXPORT_SYMBOL(p9_client_setattr); 1918 1919 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1920 { 1921 int err; 1922 struct p9_req_t *req; 1923 struct p9_client *clnt; 1924 1925 err = 0; 1926 clnt = fid->clnt; 1927 1928 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1929 1930 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1931 if (IS_ERR(req)) { 1932 err = PTR_ERR(req); 1933 goto error; 1934 } 1935 1936 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1937 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1938 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1939 if (err) { 1940 trace_9p_protocol_dump(clnt, &req->rc); 1941 p9_req_put(clnt, req); 1942 goto error; 1943 } 1944 1945 p9_debug(P9_DEBUG_9P, 1946 "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n", 1947 fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree, 1948 sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen); 1949 1950 p9_req_put(clnt, req); 1951 error: 1952 return err; 1953 } 1954 EXPORT_SYMBOL(p9_client_statfs); 1955 1956 int p9_client_rename(struct p9_fid *fid, 1957 struct p9_fid *newdirfid, const char *name) 1958 { 1959 int err; 1960 struct p9_req_t *req; 1961 struct p9_client *clnt; 1962 1963 err = 0; 1964 clnt = fid->clnt; 1965 1966 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1967 fid->fid, newdirfid->fid, name); 1968 1969 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1970 newdirfid->fid, name); 1971 if (IS_ERR(req)) { 1972 err = PTR_ERR(req); 1973 goto error; 1974 } 1975 1976 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1977 1978 p9_req_put(clnt, req); 1979 error: 1980 return err; 1981 } 1982 EXPORT_SYMBOL(p9_client_rename); 1983 1984 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1985 struct p9_fid *newdirfid, const char *new_name) 1986 { 1987 int err; 1988 struct p9_req_t *req; 1989 struct p9_client *clnt; 1990 1991 err = 0; 1992 clnt = olddirfid->clnt; 1993 1994 p9_debug(P9_DEBUG_9P, 1995 ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n", 1996 olddirfid->fid, old_name, newdirfid->fid, new_name); 1997 1998 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1999 old_name, newdirfid->fid, new_name); 2000 if (IS_ERR(req)) { 2001 err = PTR_ERR(req); 2002 goto error; 2003 } 2004 2005 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 2006 newdirfid->fid, new_name); 2007 2008 p9_req_put(clnt, req); 2009 error: 2010 return err; 2011 } 2012 EXPORT_SYMBOL(p9_client_renameat); 2013 2014 /* An xattrwalk without @attr_name gives the fid for the lisxattr namespace 2015 */ 2016 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 2017 const char *attr_name, u64 *attr_size) 2018 { 2019 int err; 2020 struct p9_req_t *req; 2021 struct p9_client *clnt; 2022 struct p9_fid *attr_fid; 2023 2024 err = 0; 2025 clnt = file_fid->clnt; 2026 attr_fid = p9_fid_create(clnt); 2027 if (!attr_fid) { 2028 err = -ENOMEM; 2029 goto error; 2030 } 2031 p9_debug(P9_DEBUG_9P, 2032 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 2033 file_fid->fid, attr_fid->fid, attr_name); 2034 2035 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 2036 file_fid->fid, attr_fid->fid, attr_name); 2037 if (IS_ERR(req)) { 2038 err = PTR_ERR(req); 2039 goto error; 2040 } 2041 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); 2042 if (err) { 2043 trace_9p_protocol_dump(clnt, &req->rc); 2044 p9_req_put(clnt, req); 2045 goto clunk_fid; 2046 } 2047 p9_req_put(clnt, req); 2048 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2049 attr_fid->fid, *attr_size); 2050 return attr_fid; 2051 clunk_fid: 2052 p9_fid_put(attr_fid); 2053 attr_fid = NULL; 2054 error: 2055 if (attr_fid && attr_fid != file_fid) 2056 p9_fid_destroy(attr_fid); 2057 2058 return ERR_PTR(err); 2059 } 2060 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2061 2062 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2063 u64 attr_size, int flags) 2064 { 2065 int err; 2066 struct p9_req_t *req; 2067 struct p9_client *clnt; 2068 2069 p9_debug(P9_DEBUG_9P, 2070 ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n", 2071 fid->fid, name, attr_size, flags); 2072 err = 0; 2073 clnt = fid->clnt; 2074 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2075 fid->fid, name, attr_size, flags); 2076 if (IS_ERR(req)) { 2077 err = PTR_ERR(req); 2078 goto error; 2079 } 2080 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2081 p9_req_put(clnt, req); 2082 error: 2083 return err; 2084 } 2085 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2086 2087 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2088 { 2089 int err, rsize, non_zc = 0; 2090 struct p9_client *clnt; 2091 struct p9_req_t *req; 2092 char *dataptr; 2093 struct kvec kv = {.iov_base = data, .iov_len = count}; 2094 struct iov_iter to; 2095 2096 iov_iter_kvec(&to, READ, &kv, 1, count); 2097 2098 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2099 fid->fid, offset, count); 2100 2101 err = 0; 2102 clnt = fid->clnt; 2103 2104 rsize = fid->iounit; 2105 if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ) 2106 rsize = clnt->msize - P9_READDIRHDRSZ; 2107 2108 if (count < rsize) 2109 rsize = count; 2110 2111 /* Don't bother zerocopy for small IO (< 1024) */ 2112 if (clnt->trans_mod->zc_request && rsize > 1024) { 2113 /* response header len is 11 2114 * PDU Header(7) + IO Size (4) 2115 */ 2116 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2117 11, "dqd", fid->fid, offset, rsize); 2118 } else { 2119 non_zc = 1; 2120 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2121 offset, rsize); 2122 } 2123 if (IS_ERR(req)) { 2124 err = PTR_ERR(req); 2125 goto error; 2126 } 2127 2128 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); 2129 if (err) { 2130 trace_9p_protocol_dump(clnt, &req->rc); 2131 goto free_and_error; 2132 } 2133 if (rsize < count) { 2134 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2135 count = rsize; 2136 } 2137 2138 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2139 2140 if (non_zc) 2141 memmove(data, dataptr, count); 2142 2143 p9_req_put(clnt, req); 2144 return count; 2145 2146 free_and_error: 2147 p9_req_put(clnt, req); 2148 error: 2149 return err; 2150 } 2151 EXPORT_SYMBOL(p9_client_readdir); 2152 2153 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2154 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2155 { 2156 int err; 2157 struct p9_client *clnt; 2158 struct p9_req_t *req; 2159 2160 err = 0; 2161 clnt = fid->clnt; 2162 p9_debug(P9_DEBUG_9P, 2163 ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n", 2164 fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2165 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2166 MAJOR(rdev), MINOR(rdev), gid); 2167 if (IS_ERR(req)) 2168 return PTR_ERR(req); 2169 2170 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2171 if (err) { 2172 trace_9p_protocol_dump(clnt, &req->rc); 2173 goto error; 2174 } 2175 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", 2176 qid->type, qid->path, qid->version); 2177 2178 error: 2179 p9_req_put(clnt, req); 2180 return err; 2181 } 2182 EXPORT_SYMBOL(p9_client_mknod_dotl); 2183 2184 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2185 kgid_t gid, struct p9_qid *qid) 2186 { 2187 int err; 2188 struct p9_client *clnt; 2189 struct p9_req_t *req; 2190 2191 err = 0; 2192 clnt = fid->clnt; 2193 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2194 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2195 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", 2196 fid->fid, name, mode, gid); 2197 if (IS_ERR(req)) 2198 return PTR_ERR(req); 2199 2200 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2201 if (err) { 2202 trace_9p_protocol_dump(clnt, &req->rc); 2203 goto error; 2204 } 2205 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2206 qid->path, qid->version); 2207 2208 error: 2209 p9_req_put(clnt, req); 2210 return err; 2211 } 2212 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2213 2214 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2215 { 2216 int err; 2217 struct p9_client *clnt; 2218 struct p9_req_t *req; 2219 2220 err = 0; 2221 clnt = fid->clnt; 2222 p9_debug(P9_DEBUG_9P, 2223 ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n", 2224 fid->fid, flock->type, flock->flags, flock->start, 2225 flock->length, flock->proc_id, flock->client_id); 2226 2227 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2228 flock->flags, flock->start, flock->length, 2229 flock->proc_id, flock->client_id); 2230 2231 if (IS_ERR(req)) 2232 return PTR_ERR(req); 2233 2234 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); 2235 if (err) { 2236 trace_9p_protocol_dump(clnt, &req->rc); 2237 goto error; 2238 } 2239 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2240 error: 2241 p9_req_put(clnt, req); 2242 return err; 2243 } 2244 EXPORT_SYMBOL(p9_client_lock_dotl); 2245 2246 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2247 { 2248 int err; 2249 struct p9_client *clnt; 2250 struct p9_req_t *req; 2251 2252 err = 0; 2253 clnt = fid->clnt; 2254 p9_debug(P9_DEBUG_9P, 2255 ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n", 2256 fid->fid, glock->type, glock->start, glock->length, 2257 glock->proc_id, glock->client_id); 2258 2259 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, 2260 glock->type, glock->start, glock->length, 2261 glock->proc_id, glock->client_id); 2262 2263 if (IS_ERR(req)) 2264 return PTR_ERR(req); 2265 2266 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, 2267 &glock->start, &glock->length, &glock->proc_id, 2268 &glock->client_id); 2269 if (err) { 2270 trace_9p_protocol_dump(clnt, &req->rc); 2271 goto error; 2272 } 2273 p9_debug(P9_DEBUG_9P, 2274 "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n", 2275 glock->type, glock->start, glock->length, 2276 glock->proc_id, glock->client_id); 2277 error: 2278 p9_req_put(clnt, req); 2279 return err; 2280 } 2281 EXPORT_SYMBOL(p9_client_getlock_dotl); 2282 2283 int p9_client_readlink(struct p9_fid *fid, char **target) 2284 { 2285 int err; 2286 struct p9_client *clnt; 2287 struct p9_req_t *req; 2288 2289 err = 0; 2290 clnt = fid->clnt; 2291 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2292 2293 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2294 if (IS_ERR(req)) 2295 return PTR_ERR(req); 2296 2297 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); 2298 if (err) { 2299 trace_9p_protocol_dump(clnt, &req->rc); 2300 goto error; 2301 } 2302 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2303 error: 2304 p9_req_put(clnt, req); 2305 return err; 2306 } 2307 EXPORT_SYMBOL(p9_client_readlink); 2308 2309 int __init p9_client_init(void) 2310 { 2311 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); 2312 return p9_req_cache ? 0 : -ENOMEM; 2313 } 2314 2315 void __exit p9_client_exit(void) 2316 { 2317 kmem_cache_destroy(p9_req_cache); 2318 } 2319