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 = kzalloc(sizeof(*fid), GFP_KERNEL); 891 if (!fid) 892 return NULL; 893 894 fid->mode = -1; 895 fid->uid = current_fsuid(); 896 fid->clnt = clnt; 897 refcount_set(&fid->count, 1); 898 899 idr_preload(GFP_KERNEL); 900 spin_lock_irq(&clnt->lock); 901 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, 902 GFP_NOWAIT); 903 spin_unlock_irq(&clnt->lock); 904 idr_preload_end(); 905 if (!ret) { 906 trace_9p_fid_ref(fid, P9_FID_REF_CREATE); 907 return fid; 908 } 909 910 kfree(fid); 911 return NULL; 912 } 913 914 static void p9_fid_destroy(struct p9_fid *fid) 915 { 916 struct p9_client *clnt; 917 unsigned long flags; 918 919 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 920 trace_9p_fid_ref(fid, P9_FID_REF_DESTROY); 921 clnt = fid->clnt; 922 spin_lock_irqsave(&clnt->lock, flags); 923 idr_remove(&clnt->fids, fid->fid); 924 spin_unlock_irqrestore(&clnt->lock, flags); 925 kfree(fid->rdir); 926 kfree(fid); 927 } 928 929 /* We also need to export tracepoint symbols for tracepoint_enabled() */ 930 EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref); 931 932 void do_trace_9p_fid_get(struct p9_fid *fid) 933 { 934 trace_9p_fid_ref(fid, P9_FID_REF_GET); 935 } 936 EXPORT_SYMBOL(do_trace_9p_fid_get); 937 938 void do_trace_9p_fid_put(struct p9_fid *fid) 939 { 940 trace_9p_fid_ref(fid, P9_FID_REF_PUT); 941 } 942 EXPORT_SYMBOL(do_trace_9p_fid_put); 943 944 static int p9_client_version(struct p9_client *c) 945 { 946 int err = 0; 947 struct p9_req_t *req; 948 char *version = NULL; 949 int msize; 950 951 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 952 c->msize, c->proto_version); 953 954 switch (c->proto_version) { 955 case p9_proto_2000L: 956 req = p9_client_rpc(c, P9_TVERSION, "ds", 957 c->msize, "9P2000.L"); 958 break; 959 case p9_proto_2000u: 960 req = p9_client_rpc(c, P9_TVERSION, "ds", 961 c->msize, "9P2000.u"); 962 break; 963 case p9_proto_legacy: 964 req = p9_client_rpc(c, P9_TVERSION, "ds", 965 c->msize, "9P2000"); 966 break; 967 default: 968 return -EINVAL; 969 } 970 971 if (IS_ERR(req)) 972 return PTR_ERR(req); 973 974 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); 975 if (err) { 976 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 977 trace_9p_protocol_dump(c, &req->rc); 978 goto error; 979 } 980 981 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 982 if (!strncmp(version, "9P2000.L", 8)) { 983 c->proto_version = p9_proto_2000L; 984 } else if (!strncmp(version, "9P2000.u", 8)) { 985 c->proto_version = p9_proto_2000u; 986 } else if (!strncmp(version, "9P2000", 6)) { 987 c->proto_version = p9_proto_legacy; 988 } else { 989 p9_debug(P9_DEBUG_ERROR, 990 "server returned an unknown version: %s\n", version); 991 err = -EREMOTEIO; 992 goto error; 993 } 994 995 if (msize < 4096) { 996 p9_debug(P9_DEBUG_ERROR, 997 "server returned a msize < 4096: %d\n", msize); 998 err = -EREMOTEIO; 999 goto error; 1000 } 1001 if (msize < c->msize) 1002 c->msize = msize; 1003 1004 error: 1005 kfree(version); 1006 p9_req_put(c, req); 1007 1008 return err; 1009 } 1010 1011 struct p9_client *p9_client_create(const char *dev_name, char *options) 1012 { 1013 int err; 1014 struct p9_client *clnt; 1015 char *client_id; 1016 1017 err = 0; 1018 clnt = kmalloc(sizeof(*clnt), GFP_KERNEL); 1019 if (!clnt) 1020 return ERR_PTR(-ENOMEM); 1021 1022 clnt->trans_mod = NULL; 1023 clnt->trans = NULL; 1024 clnt->fcall_cache = NULL; 1025 1026 client_id = utsname()->nodename; 1027 memcpy(clnt->name, client_id, strlen(client_id) + 1); 1028 1029 spin_lock_init(&clnt->lock); 1030 idr_init(&clnt->fids); 1031 idr_init(&clnt->reqs); 1032 1033 err = parse_opts(options, clnt); 1034 if (err < 0) 1035 goto free_client; 1036 1037 if (!clnt->trans_mod) 1038 clnt->trans_mod = v9fs_get_default_trans(); 1039 1040 if (!clnt->trans_mod) { 1041 err = -EPROTONOSUPPORT; 1042 p9_debug(P9_DEBUG_ERROR, 1043 "No transport defined or default transport\n"); 1044 goto free_client; 1045 } 1046 1047 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1048 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1049 1050 err = clnt->trans_mod->create(clnt, dev_name, options); 1051 if (err) 1052 goto put_trans; 1053 1054 if (clnt->msize > clnt->trans_mod->maxsize) { 1055 clnt->msize = clnt->trans_mod->maxsize; 1056 pr_info("Limiting 'msize' to %d as this is the maximum " 1057 "supported by transport %s\n", 1058 clnt->msize, clnt->trans_mod->name 1059 ); 1060 } 1061 1062 if (clnt->msize < 4096) { 1063 p9_debug(P9_DEBUG_ERROR, 1064 "Please specify a msize of at least 4k\n"); 1065 err = -EINVAL; 1066 goto close_trans; 1067 } 1068 1069 err = p9_client_version(clnt); 1070 if (err) 1071 goto close_trans; 1072 1073 /* P9_HDRSZ + 4 is the smallest packet header we can have that is 1074 * followed by data accessed from userspace by read 1075 */ 1076 clnt->fcall_cache = 1077 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, 1078 0, 0, P9_HDRSZ + 4, 1079 clnt->msize - (P9_HDRSZ + 4), 1080 NULL); 1081 1082 return clnt; 1083 1084 close_trans: 1085 clnt->trans_mod->close(clnt); 1086 put_trans: 1087 v9fs_put_trans(clnt->trans_mod); 1088 free_client: 1089 kfree(clnt); 1090 return ERR_PTR(err); 1091 } 1092 EXPORT_SYMBOL(p9_client_create); 1093 1094 void p9_client_destroy(struct p9_client *clnt) 1095 { 1096 struct p9_fid *fid; 1097 int id; 1098 1099 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1100 1101 if (clnt->trans_mod) 1102 clnt->trans_mod->close(clnt); 1103 1104 v9fs_put_trans(clnt->trans_mod); 1105 1106 idr_for_each_entry(&clnt->fids, fid, id) { 1107 pr_info("Found fid %d not clunked\n", fid->fid); 1108 p9_fid_destroy(fid); 1109 } 1110 1111 p9_tag_cleanup(clnt); 1112 1113 kmem_cache_destroy(clnt->fcall_cache); 1114 kfree(clnt); 1115 } 1116 EXPORT_SYMBOL(p9_client_destroy); 1117 1118 void p9_client_disconnect(struct p9_client *clnt) 1119 { 1120 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1121 clnt->status = Disconnected; 1122 } 1123 EXPORT_SYMBOL(p9_client_disconnect); 1124 1125 void p9_client_begin_disconnect(struct p9_client *clnt) 1126 { 1127 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1128 clnt->status = BeginDisconnect; 1129 } 1130 EXPORT_SYMBOL(p9_client_begin_disconnect); 1131 1132 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1133 const char *uname, kuid_t n_uname, 1134 const char *aname) 1135 { 1136 int err = 0; 1137 struct p9_req_t *req; 1138 struct p9_fid *fid; 1139 struct p9_qid qid; 1140 1141 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1142 afid ? afid->fid : -1, uname, aname); 1143 fid = p9_fid_create(clnt); 1144 if (!fid) { 1145 err = -ENOMEM; 1146 goto error; 1147 } 1148 fid->uid = n_uname; 1149 1150 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1151 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1152 if (IS_ERR(req)) { 1153 err = PTR_ERR(req); 1154 goto error; 1155 } 1156 1157 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); 1158 if (err) { 1159 trace_9p_protocol_dump(clnt, &req->rc); 1160 p9_req_put(clnt, req); 1161 goto error; 1162 } 1163 1164 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1165 qid.type, qid.path, qid.version); 1166 1167 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1168 1169 p9_req_put(clnt, req); 1170 return fid; 1171 1172 error: 1173 if (fid) 1174 p9_fid_destroy(fid); 1175 return ERR_PTR(err); 1176 } 1177 EXPORT_SYMBOL(p9_client_attach); 1178 1179 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1180 const unsigned char * const *wnames, int clone) 1181 { 1182 int err; 1183 struct p9_client *clnt; 1184 struct p9_fid *fid; 1185 struct p9_qid *wqids; 1186 struct p9_req_t *req; 1187 u16 nwqids, count; 1188 1189 err = 0; 1190 wqids = NULL; 1191 clnt = oldfid->clnt; 1192 if (clone) { 1193 fid = p9_fid_create(clnt); 1194 if (!fid) { 1195 err = -ENOMEM; 1196 goto error; 1197 } 1198 1199 fid->uid = oldfid->uid; 1200 } else { 1201 fid = oldfid; 1202 } 1203 1204 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1205 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1206 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1207 nwname, wnames); 1208 if (IS_ERR(req)) { 1209 err = PTR_ERR(req); 1210 goto error; 1211 } 1212 1213 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1214 if (err) { 1215 trace_9p_protocol_dump(clnt, &req->rc); 1216 p9_req_put(clnt, req); 1217 goto clunk_fid; 1218 } 1219 p9_req_put(clnt, req); 1220 1221 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1222 1223 if (nwqids != nwname) { 1224 err = -ENOENT; 1225 goto clunk_fid; 1226 } 1227 1228 for (count = 0; count < nwqids; count++) 1229 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1230 count, wqids[count].type, 1231 wqids[count].path, 1232 wqids[count].version); 1233 1234 if (nwname) 1235 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1236 else 1237 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); 1238 1239 kfree(wqids); 1240 return fid; 1241 1242 clunk_fid: 1243 kfree(wqids); 1244 p9_fid_put(fid); 1245 fid = NULL; 1246 1247 error: 1248 if (fid && fid != oldfid) 1249 p9_fid_destroy(fid); 1250 1251 return ERR_PTR(err); 1252 } 1253 EXPORT_SYMBOL(p9_client_walk); 1254 1255 int p9_client_open(struct p9_fid *fid, int mode) 1256 { 1257 int err; 1258 struct p9_client *clnt; 1259 struct p9_req_t *req; 1260 struct p9_qid qid; 1261 int iounit; 1262 1263 clnt = fid->clnt; 1264 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1265 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1266 err = 0; 1267 1268 if (fid->mode != -1) 1269 return -EINVAL; 1270 1271 if (p9_is_proto_dotl(clnt)) 1272 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1273 else 1274 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1275 if (IS_ERR(req)) { 1276 err = PTR_ERR(req); 1277 goto error; 1278 } 1279 1280 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1281 if (err) { 1282 trace_9p_protocol_dump(clnt, &req->rc); 1283 goto free_and_error; 1284 } 1285 1286 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1287 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1288 qid.path, qid.version, iounit); 1289 1290 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1291 fid->mode = mode; 1292 fid->iounit = iounit; 1293 1294 free_and_error: 1295 p9_req_put(clnt, req); 1296 error: 1297 return err; 1298 } 1299 EXPORT_SYMBOL(p9_client_open); 1300 1301 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, 1302 u32 mode, kgid_t gid, struct p9_qid *qid) 1303 { 1304 int err = 0; 1305 struct p9_client *clnt; 1306 struct p9_req_t *req; 1307 int iounit; 1308 1309 p9_debug(P9_DEBUG_9P, 1310 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1311 ofid->fid, name, flags, mode, 1312 from_kgid(&init_user_ns, gid)); 1313 clnt = ofid->clnt; 1314 1315 if (ofid->mode != -1) 1316 return -EINVAL; 1317 1318 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1319 mode, gid); 1320 if (IS_ERR(req)) { 1321 err = PTR_ERR(req); 1322 goto error; 1323 } 1324 1325 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); 1326 if (err) { 1327 trace_9p_protocol_dump(clnt, &req->rc); 1328 goto free_and_error; 1329 } 1330 1331 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1332 qid->type, qid->path, qid->version, iounit); 1333 1334 memmove(&ofid->qid, qid, sizeof(struct p9_qid)); 1335 ofid->mode = mode; 1336 ofid->iounit = iounit; 1337 1338 free_and_error: 1339 p9_req_put(clnt, req); 1340 error: 1341 return err; 1342 } 1343 EXPORT_SYMBOL(p9_client_create_dotl); 1344 1345 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1346 char *extension) 1347 { 1348 int err; 1349 struct p9_client *clnt; 1350 struct p9_req_t *req; 1351 struct p9_qid qid; 1352 int iounit; 1353 1354 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1355 fid->fid, name, perm, mode); 1356 err = 0; 1357 clnt = fid->clnt; 1358 1359 if (fid->mode != -1) 1360 return -EINVAL; 1361 1362 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1363 mode, extension); 1364 if (IS_ERR(req)) { 1365 err = PTR_ERR(req); 1366 goto error; 1367 } 1368 1369 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1370 if (err) { 1371 trace_9p_protocol_dump(clnt, &req->rc); 1372 goto free_and_error; 1373 } 1374 1375 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1376 qid.type, qid.path, qid.version, iounit); 1377 1378 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1379 fid->mode = mode; 1380 fid->iounit = iounit; 1381 1382 free_and_error: 1383 p9_req_put(clnt, req); 1384 error: 1385 return err; 1386 } 1387 EXPORT_SYMBOL(p9_client_fcreate); 1388 1389 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1390 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1391 { 1392 int err = 0; 1393 struct p9_client *clnt; 1394 struct p9_req_t *req; 1395 1396 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1397 dfid->fid, name, symtgt); 1398 clnt = dfid->clnt; 1399 1400 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1401 gid); 1402 if (IS_ERR(req)) { 1403 err = PTR_ERR(req); 1404 goto error; 1405 } 1406 1407 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 1408 if (err) { 1409 trace_9p_protocol_dump(clnt, &req->rc); 1410 goto free_and_error; 1411 } 1412 1413 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1414 qid->type, qid->path, qid->version); 1415 1416 free_and_error: 1417 p9_req_put(clnt, req); 1418 error: 1419 return err; 1420 } 1421 EXPORT_SYMBOL(p9_client_symlink); 1422 1423 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1424 { 1425 struct p9_client *clnt; 1426 struct p9_req_t *req; 1427 1428 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1429 dfid->fid, oldfid->fid, newname); 1430 clnt = dfid->clnt; 1431 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1432 newname); 1433 if (IS_ERR(req)) 1434 return PTR_ERR(req); 1435 1436 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1437 p9_req_put(clnt, req); 1438 return 0; 1439 } 1440 EXPORT_SYMBOL(p9_client_link); 1441 1442 int p9_client_fsync(struct p9_fid *fid, int datasync) 1443 { 1444 int err; 1445 struct p9_client *clnt; 1446 struct p9_req_t *req; 1447 1448 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1449 fid->fid, datasync); 1450 err = 0; 1451 clnt = fid->clnt; 1452 1453 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1454 if (IS_ERR(req)) { 1455 err = PTR_ERR(req); 1456 goto error; 1457 } 1458 1459 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1460 1461 p9_req_put(clnt, req); 1462 1463 error: 1464 return err; 1465 } 1466 EXPORT_SYMBOL(p9_client_fsync); 1467 1468 int p9_client_clunk(struct p9_fid *fid) 1469 { 1470 int err; 1471 struct p9_client *clnt; 1472 struct p9_req_t *req; 1473 int retries = 0; 1474 1475 again: 1476 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", 1477 fid->fid, retries); 1478 err = 0; 1479 clnt = fid->clnt; 1480 1481 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1482 if (IS_ERR(req)) { 1483 err = PTR_ERR(req); 1484 goto error; 1485 } 1486 1487 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1488 1489 p9_req_put(clnt, req); 1490 error: 1491 /* Fid is not valid even after a failed clunk 1492 * If interrupted, retry once then give up and 1493 * leak fid until umount. 1494 */ 1495 if (err == -ERESTARTSYS) { 1496 if (retries++ == 0) 1497 goto again; 1498 } else { 1499 p9_fid_destroy(fid); 1500 } 1501 return err; 1502 } 1503 EXPORT_SYMBOL(p9_client_clunk); 1504 1505 int p9_client_remove(struct p9_fid *fid) 1506 { 1507 int err; 1508 struct p9_client *clnt; 1509 struct p9_req_t *req; 1510 1511 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1512 err = 0; 1513 clnt = fid->clnt; 1514 1515 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1516 if (IS_ERR(req)) { 1517 err = PTR_ERR(req); 1518 goto error; 1519 } 1520 1521 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1522 1523 p9_req_put(clnt, req); 1524 error: 1525 if (err == -ERESTARTSYS) 1526 p9_fid_put(fid); 1527 else 1528 p9_fid_destroy(fid); 1529 return err; 1530 } 1531 EXPORT_SYMBOL(p9_client_remove); 1532 1533 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1534 { 1535 int err = 0; 1536 struct p9_req_t *req; 1537 struct p9_client *clnt; 1538 1539 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1540 dfid->fid, name, flags); 1541 1542 clnt = dfid->clnt; 1543 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1544 if (IS_ERR(req)) { 1545 err = PTR_ERR(req); 1546 goto error; 1547 } 1548 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1549 1550 p9_req_put(clnt, req); 1551 error: 1552 return err; 1553 } 1554 EXPORT_SYMBOL(p9_client_unlinkat); 1555 1556 int 1557 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1558 { 1559 int total = 0; 1560 *err = 0; 1561 1562 while (iov_iter_count(to)) { 1563 int count; 1564 1565 count = p9_client_read_once(fid, offset, to, err); 1566 if (!count || *err) 1567 break; 1568 offset += count; 1569 total += count; 1570 } 1571 return total; 1572 } 1573 EXPORT_SYMBOL(p9_client_read); 1574 1575 int 1576 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, 1577 int *err) 1578 { 1579 struct p9_client *clnt = fid->clnt; 1580 struct p9_req_t *req; 1581 int count = iov_iter_count(to); 1582 int rsize, non_zc = 0; 1583 char *dataptr; 1584 1585 *err = 0; 1586 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n", 1587 fid->fid, offset, iov_iter_count(to)); 1588 1589 rsize = fid->iounit; 1590 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1591 rsize = clnt->msize - P9_IOHDRSZ; 1592 1593 if (count < rsize) 1594 rsize = count; 1595 1596 /* Don't bother zerocopy for small IO (< 1024) */ 1597 if (clnt->trans_mod->zc_request && rsize > 1024) { 1598 /* response header len is 11 1599 * PDU Header(7) + IO Size (4) 1600 */ 1601 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1602 0, 11, "dqd", fid->fid, 1603 offset, rsize); 1604 } else { 1605 non_zc = 1; 1606 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1607 rsize); 1608 } 1609 if (IS_ERR(req)) { 1610 *err = PTR_ERR(req); 1611 return 0; 1612 } 1613 1614 *err = p9pdu_readf(&req->rc, clnt->proto_version, 1615 "D", &count, &dataptr); 1616 if (*err) { 1617 trace_9p_protocol_dump(clnt, &req->rc); 1618 p9_req_put(clnt, req); 1619 return 0; 1620 } 1621 if (rsize < count) { 1622 pr_err("bogus RREAD count (%d > %d)\n", count, rsize); 1623 count = rsize; 1624 } 1625 1626 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1627 1628 if (non_zc) { 1629 int n = copy_to_iter(dataptr, count, to); 1630 1631 if (n != count) { 1632 *err = -EFAULT; 1633 p9_req_put(clnt, req); 1634 return n; 1635 } 1636 } else { 1637 iov_iter_advance(to, count); 1638 } 1639 p9_req_put(clnt, req); 1640 return count; 1641 } 1642 EXPORT_SYMBOL(p9_client_read_once); 1643 1644 int 1645 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1646 { 1647 struct p9_client *clnt = fid->clnt; 1648 struct p9_req_t *req; 1649 int total = 0; 1650 *err = 0; 1651 1652 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", 1653 fid->fid, offset, iov_iter_count(from)); 1654 1655 while (iov_iter_count(from)) { 1656 int count = iov_iter_count(from); 1657 int rsize = fid->iounit; 1658 1659 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1660 rsize = clnt->msize - P9_IOHDRSZ; 1661 1662 if (count < rsize) 1663 rsize = count; 1664 1665 /* Don't bother zerocopy for small IO (< 1024) */ 1666 if (clnt->trans_mod->zc_request && rsize > 1024) { 1667 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1668 rsize, P9_ZC_HDR_SZ, "dqd", 1669 fid->fid, offset, rsize); 1670 } else { 1671 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1672 offset, rsize, from); 1673 } 1674 if (IS_ERR(req)) { 1675 *err = PTR_ERR(req); 1676 break; 1677 } 1678 1679 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count); 1680 if (*err) { 1681 trace_9p_protocol_dump(clnt, &req->rc); 1682 p9_req_put(clnt, req); 1683 break; 1684 } 1685 if (rsize < count) { 1686 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize); 1687 count = rsize; 1688 } 1689 1690 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1691 1692 p9_req_put(clnt, req); 1693 iov_iter_advance(from, count); 1694 total += count; 1695 offset += count; 1696 } 1697 return total; 1698 } 1699 EXPORT_SYMBOL(p9_client_write); 1700 1701 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1702 { 1703 int err; 1704 struct p9_client *clnt; 1705 struct p9_wstat *ret; 1706 struct p9_req_t *req; 1707 u16 ignored; 1708 1709 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1710 1711 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1712 if (!ret) 1713 return ERR_PTR(-ENOMEM); 1714 1715 err = 0; 1716 clnt = fid->clnt; 1717 1718 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1719 if (IS_ERR(req)) { 1720 err = PTR_ERR(req); 1721 goto error; 1722 } 1723 1724 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); 1725 if (err) { 1726 trace_9p_protocol_dump(clnt, &req->rc); 1727 p9_req_put(clnt, req); 1728 goto error; 1729 } 1730 1731 p9_debug(P9_DEBUG_9P, 1732 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1733 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1734 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1735 "<<< uid=%d gid=%d n_muid=%d\n", 1736 ret->size, ret->type, ret->dev, ret->qid.type, ret->qid.path, 1737 ret->qid.version, ret->mode, 1738 ret->atime, ret->mtime, ret->length, 1739 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1740 from_kuid(&init_user_ns, ret->n_uid), 1741 from_kgid(&init_user_ns, ret->n_gid), 1742 from_kuid(&init_user_ns, ret->n_muid)); 1743 1744 p9_req_put(clnt, req); 1745 return ret; 1746 1747 error: 1748 kfree(ret); 1749 return ERR_PTR(err); 1750 } 1751 EXPORT_SYMBOL(p9_client_stat); 1752 1753 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1754 u64 request_mask) 1755 { 1756 int err; 1757 struct p9_client *clnt; 1758 struct p9_stat_dotl *ret; 1759 struct p9_req_t *req; 1760 1761 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1762 fid->fid, request_mask); 1763 1764 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1765 if (!ret) 1766 return ERR_PTR(-ENOMEM); 1767 1768 err = 0; 1769 clnt = fid->clnt; 1770 1771 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1772 if (IS_ERR(req)) { 1773 err = PTR_ERR(req); 1774 goto error; 1775 } 1776 1777 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); 1778 if (err) { 1779 trace_9p_protocol_dump(clnt, &req->rc); 1780 p9_req_put(clnt, req); 1781 goto error; 1782 } 1783 1784 p9_debug(P9_DEBUG_9P, "<<< RGETATTR st_result_mask=%lld\n" 1785 "<<< qid=%x.%llx.%x\n" 1786 "<<< st_mode=%8.8x st_nlink=%llu\n" 1787 "<<< st_uid=%d st_gid=%d\n" 1788 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1789 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1790 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1791 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1792 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1793 "<<< st_gen=%lld st_data_version=%lld\n", 1794 ret->st_result_mask, 1795 ret->qid.type, ret->qid.path, ret->qid.version, 1796 ret->st_mode, ret->st_nlink, 1797 from_kuid(&init_user_ns, ret->st_uid), 1798 from_kgid(&init_user_ns, ret->st_gid), 1799 ret->st_rdev, ret->st_size, ret->st_blksize, ret->st_blocks, 1800 ret->st_atime_sec, ret->st_atime_nsec, 1801 ret->st_mtime_sec, ret->st_mtime_nsec, 1802 ret->st_ctime_sec, ret->st_ctime_nsec, 1803 ret->st_btime_sec, ret->st_btime_nsec, 1804 ret->st_gen, ret->st_data_version); 1805 1806 p9_req_put(clnt, req); 1807 return ret; 1808 1809 error: 1810 kfree(ret); 1811 return ERR_PTR(err); 1812 } 1813 EXPORT_SYMBOL(p9_client_getattr_dotl); 1814 1815 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1816 { 1817 int ret; 1818 1819 /* NOTE: size shouldn't include its own length */ 1820 /* size[2] type[2] dev[4] qid[13] */ 1821 /* mode[4] atime[4] mtime[4] length[8]*/ 1822 /* name[s] uid[s] gid[s] muid[s] */ 1823 ret = 2 + 4 + 13 + 4 + 4 + 4 + 8 + 2 + 2 + 2 + 2; 1824 1825 if (wst->name) 1826 ret += strlen(wst->name); 1827 if (wst->uid) 1828 ret += strlen(wst->uid); 1829 if (wst->gid) 1830 ret += strlen(wst->gid); 1831 if (wst->muid) 1832 ret += strlen(wst->muid); 1833 1834 if (proto_version == p9_proto_2000u || 1835 proto_version == p9_proto_2000L) { 1836 /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1837 ret += 2 + 4 + 4 + 4; 1838 if (wst->extension) 1839 ret += strlen(wst->extension); 1840 } 1841 1842 return ret; 1843 } 1844 1845 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1846 { 1847 int err; 1848 struct p9_req_t *req; 1849 struct p9_client *clnt; 1850 1851 err = 0; 1852 clnt = fid->clnt; 1853 wst->size = p9_client_statsize(wst, clnt->proto_version); 1854 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", 1855 fid->fid); 1856 p9_debug(P9_DEBUG_9P, 1857 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1858 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1859 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1860 " uid=%d gid=%d n_muid=%d\n", 1861 wst->size, wst->type, wst->dev, wst->qid.type, 1862 wst->qid.path, wst->qid.version, 1863 wst->mode, wst->atime, wst->mtime, wst->length, 1864 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1865 from_kuid(&init_user_ns, wst->n_uid), 1866 from_kgid(&init_user_ns, wst->n_gid), 1867 from_kuid(&init_user_ns, wst->n_muid)); 1868 1869 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", 1870 fid->fid, wst->size + 2, wst); 1871 if (IS_ERR(req)) { 1872 err = PTR_ERR(req); 1873 goto error; 1874 } 1875 1876 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1877 1878 p9_req_put(clnt, req); 1879 error: 1880 return err; 1881 } 1882 EXPORT_SYMBOL(p9_client_wstat); 1883 1884 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1885 { 1886 int err; 1887 struct p9_req_t *req; 1888 struct p9_client *clnt; 1889 1890 err = 0; 1891 clnt = fid->clnt; 1892 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1893 p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n", 1894 p9attr->valid, p9attr->mode, 1895 from_kuid(&init_user_ns, p9attr->uid), 1896 from_kgid(&init_user_ns, p9attr->gid), 1897 p9attr->size); 1898 p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n", 1899 p9attr->atime_sec, p9attr->atime_nsec); 1900 p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n", 1901 p9attr->mtime_sec, p9attr->mtime_nsec); 1902 1903 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1904 1905 if (IS_ERR(req)) { 1906 err = PTR_ERR(req); 1907 goto error; 1908 } 1909 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1910 p9_req_put(clnt, req); 1911 error: 1912 return err; 1913 } 1914 EXPORT_SYMBOL(p9_client_setattr); 1915 1916 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1917 { 1918 int err; 1919 struct p9_req_t *req; 1920 struct p9_client *clnt; 1921 1922 err = 0; 1923 clnt = fid->clnt; 1924 1925 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1926 1927 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1928 if (IS_ERR(req)) { 1929 err = PTR_ERR(req); 1930 goto error; 1931 } 1932 1933 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1934 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1935 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1936 if (err) { 1937 trace_9p_protocol_dump(clnt, &req->rc); 1938 p9_req_put(clnt, req); 1939 goto error; 1940 } 1941 1942 p9_debug(P9_DEBUG_9P, 1943 "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n", 1944 fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree, 1945 sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen); 1946 1947 p9_req_put(clnt, req); 1948 error: 1949 return err; 1950 } 1951 EXPORT_SYMBOL(p9_client_statfs); 1952 1953 int p9_client_rename(struct p9_fid *fid, 1954 struct p9_fid *newdirfid, const char *name) 1955 { 1956 int err; 1957 struct p9_req_t *req; 1958 struct p9_client *clnt; 1959 1960 err = 0; 1961 clnt = fid->clnt; 1962 1963 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1964 fid->fid, newdirfid->fid, name); 1965 1966 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1967 newdirfid->fid, name); 1968 if (IS_ERR(req)) { 1969 err = PTR_ERR(req); 1970 goto error; 1971 } 1972 1973 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1974 1975 p9_req_put(clnt, req); 1976 error: 1977 return err; 1978 } 1979 EXPORT_SYMBOL(p9_client_rename); 1980 1981 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1982 struct p9_fid *newdirfid, const char *new_name) 1983 { 1984 int err; 1985 struct p9_req_t *req; 1986 struct p9_client *clnt; 1987 1988 err = 0; 1989 clnt = olddirfid->clnt; 1990 1991 p9_debug(P9_DEBUG_9P, 1992 ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n", 1993 olddirfid->fid, old_name, newdirfid->fid, new_name); 1994 1995 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1996 old_name, newdirfid->fid, new_name); 1997 if (IS_ERR(req)) { 1998 err = PTR_ERR(req); 1999 goto error; 2000 } 2001 2002 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 2003 newdirfid->fid, new_name); 2004 2005 p9_req_put(clnt, req); 2006 error: 2007 return err; 2008 } 2009 EXPORT_SYMBOL(p9_client_renameat); 2010 2011 /* An xattrwalk without @attr_name gives the fid for the lisxattr namespace 2012 */ 2013 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 2014 const char *attr_name, u64 *attr_size) 2015 { 2016 int err; 2017 struct p9_req_t *req; 2018 struct p9_client *clnt; 2019 struct p9_fid *attr_fid; 2020 2021 err = 0; 2022 clnt = file_fid->clnt; 2023 attr_fid = p9_fid_create(clnt); 2024 if (!attr_fid) { 2025 err = -ENOMEM; 2026 goto error; 2027 } 2028 p9_debug(P9_DEBUG_9P, 2029 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 2030 file_fid->fid, attr_fid->fid, attr_name); 2031 2032 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 2033 file_fid->fid, attr_fid->fid, attr_name); 2034 if (IS_ERR(req)) { 2035 err = PTR_ERR(req); 2036 goto error; 2037 } 2038 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); 2039 if (err) { 2040 trace_9p_protocol_dump(clnt, &req->rc); 2041 p9_req_put(clnt, req); 2042 goto clunk_fid; 2043 } 2044 p9_req_put(clnt, req); 2045 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2046 attr_fid->fid, *attr_size); 2047 return attr_fid; 2048 clunk_fid: 2049 p9_fid_put(attr_fid); 2050 attr_fid = NULL; 2051 error: 2052 if (attr_fid && attr_fid != file_fid) 2053 p9_fid_destroy(attr_fid); 2054 2055 return ERR_PTR(err); 2056 } 2057 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2058 2059 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2060 u64 attr_size, int flags) 2061 { 2062 int err; 2063 struct p9_req_t *req; 2064 struct p9_client *clnt; 2065 2066 p9_debug(P9_DEBUG_9P, 2067 ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n", 2068 fid->fid, name, attr_size, flags); 2069 err = 0; 2070 clnt = fid->clnt; 2071 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2072 fid->fid, name, attr_size, flags); 2073 if (IS_ERR(req)) { 2074 err = PTR_ERR(req); 2075 goto error; 2076 } 2077 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2078 p9_req_put(clnt, req); 2079 error: 2080 return err; 2081 } 2082 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2083 2084 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2085 { 2086 int err, rsize, non_zc = 0; 2087 struct p9_client *clnt; 2088 struct p9_req_t *req; 2089 char *dataptr; 2090 struct kvec kv = {.iov_base = data, .iov_len = count}; 2091 struct iov_iter to; 2092 2093 iov_iter_kvec(&to, READ, &kv, 1, count); 2094 2095 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2096 fid->fid, offset, count); 2097 2098 err = 0; 2099 clnt = fid->clnt; 2100 2101 rsize = fid->iounit; 2102 if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ) 2103 rsize = clnt->msize - P9_READDIRHDRSZ; 2104 2105 if (count < rsize) 2106 rsize = count; 2107 2108 /* Don't bother zerocopy for small IO (< 1024) */ 2109 if (clnt->trans_mod->zc_request && rsize > 1024) { 2110 /* response header len is 11 2111 * PDU Header(7) + IO Size (4) 2112 */ 2113 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2114 11, "dqd", fid->fid, offset, rsize); 2115 } else { 2116 non_zc = 1; 2117 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2118 offset, rsize); 2119 } 2120 if (IS_ERR(req)) { 2121 err = PTR_ERR(req); 2122 goto error; 2123 } 2124 2125 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); 2126 if (err) { 2127 trace_9p_protocol_dump(clnt, &req->rc); 2128 goto free_and_error; 2129 } 2130 if (rsize < count) { 2131 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2132 count = rsize; 2133 } 2134 2135 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2136 2137 if (non_zc) 2138 memmove(data, dataptr, count); 2139 2140 p9_req_put(clnt, req); 2141 return count; 2142 2143 free_and_error: 2144 p9_req_put(clnt, req); 2145 error: 2146 return err; 2147 } 2148 EXPORT_SYMBOL(p9_client_readdir); 2149 2150 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2151 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2152 { 2153 int err; 2154 struct p9_client *clnt; 2155 struct p9_req_t *req; 2156 2157 err = 0; 2158 clnt = fid->clnt; 2159 p9_debug(P9_DEBUG_9P, 2160 ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n", 2161 fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2162 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2163 MAJOR(rdev), MINOR(rdev), gid); 2164 if (IS_ERR(req)) 2165 return PTR_ERR(req); 2166 2167 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2168 if (err) { 2169 trace_9p_protocol_dump(clnt, &req->rc); 2170 goto error; 2171 } 2172 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", 2173 qid->type, qid->path, qid->version); 2174 2175 error: 2176 p9_req_put(clnt, req); 2177 return err; 2178 } 2179 EXPORT_SYMBOL(p9_client_mknod_dotl); 2180 2181 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2182 kgid_t gid, struct p9_qid *qid) 2183 { 2184 int err; 2185 struct p9_client *clnt; 2186 struct p9_req_t *req; 2187 2188 err = 0; 2189 clnt = fid->clnt; 2190 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2191 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2192 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", 2193 fid->fid, name, mode, gid); 2194 if (IS_ERR(req)) 2195 return PTR_ERR(req); 2196 2197 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2198 if (err) { 2199 trace_9p_protocol_dump(clnt, &req->rc); 2200 goto error; 2201 } 2202 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2203 qid->path, qid->version); 2204 2205 error: 2206 p9_req_put(clnt, req); 2207 return err; 2208 } 2209 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2210 2211 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2212 { 2213 int err; 2214 struct p9_client *clnt; 2215 struct p9_req_t *req; 2216 2217 err = 0; 2218 clnt = fid->clnt; 2219 p9_debug(P9_DEBUG_9P, 2220 ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n", 2221 fid->fid, flock->type, flock->flags, flock->start, 2222 flock->length, flock->proc_id, flock->client_id); 2223 2224 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2225 flock->flags, flock->start, flock->length, 2226 flock->proc_id, flock->client_id); 2227 2228 if (IS_ERR(req)) 2229 return PTR_ERR(req); 2230 2231 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); 2232 if (err) { 2233 trace_9p_protocol_dump(clnt, &req->rc); 2234 goto error; 2235 } 2236 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2237 error: 2238 p9_req_put(clnt, req); 2239 return err; 2240 } 2241 EXPORT_SYMBOL(p9_client_lock_dotl); 2242 2243 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2244 { 2245 int err; 2246 struct p9_client *clnt; 2247 struct p9_req_t *req; 2248 2249 err = 0; 2250 clnt = fid->clnt; 2251 p9_debug(P9_DEBUG_9P, 2252 ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n", 2253 fid->fid, glock->type, glock->start, glock->length, 2254 glock->proc_id, glock->client_id); 2255 2256 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, 2257 glock->type, glock->start, glock->length, 2258 glock->proc_id, glock->client_id); 2259 2260 if (IS_ERR(req)) 2261 return PTR_ERR(req); 2262 2263 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, 2264 &glock->start, &glock->length, &glock->proc_id, 2265 &glock->client_id); 2266 if (err) { 2267 trace_9p_protocol_dump(clnt, &req->rc); 2268 goto error; 2269 } 2270 p9_debug(P9_DEBUG_9P, 2271 "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n", 2272 glock->type, glock->start, glock->length, 2273 glock->proc_id, glock->client_id); 2274 error: 2275 p9_req_put(clnt, req); 2276 return err; 2277 } 2278 EXPORT_SYMBOL(p9_client_getlock_dotl); 2279 2280 int p9_client_readlink(struct p9_fid *fid, char **target) 2281 { 2282 int err; 2283 struct p9_client *clnt; 2284 struct p9_req_t *req; 2285 2286 err = 0; 2287 clnt = fid->clnt; 2288 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2289 2290 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2291 if (IS_ERR(req)) 2292 return PTR_ERR(req); 2293 2294 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); 2295 if (err) { 2296 trace_9p_protocol_dump(clnt, &req->rc); 2297 goto error; 2298 } 2299 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2300 error: 2301 p9_req_put(clnt, req); 2302 return err; 2303 } 2304 EXPORT_SYMBOL(p9_client_readlink); 2305 2306 int __init p9_client_init(void) 2307 { 2308 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); 2309 return p9_req_cache ? 0 : -ENOMEM; 2310 } 2311 2312 void __exit p9_client_exit(void) 2313 { 2314 kmem_cache_destroy(p9_req_cache); 2315 } 2316