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 <linux/netfs.h> 22 #include <net/9p/9p.h> 23 #include <linux/parser.h> 24 #include <linux/seq_file.h> 25 #include <net/9p/client.h> 26 #include <net/9p/transport.h> 27 #include "protocol.h" 28 29 #define CREATE_TRACE_POINTS 30 #include <trace/events/9p.h> 31 32 /* DEFAULT MSIZE = 32 pages worth of payload + P9_HDRSZ + 33 * room for write (16 extra) or read (11 extra) operands. 34 */ 35 36 #define DEFAULT_MSIZE ((128 * 1024) + P9_IOHDRSZ) 37 38 /* Client Option Parsing (code inspired by NFS code) 39 * - a little lazy - parse all client options 40 */ 41 42 enum { 43 Opt_msize, 44 Opt_trans, 45 Opt_legacy, 46 Opt_version, 47 Opt_err, 48 }; 49 50 static const match_table_t tokens = { 51 {Opt_msize, "msize=%u"}, 52 {Opt_legacy, "noextend"}, 53 {Opt_trans, "trans=%s"}, 54 {Opt_version, "version=%s"}, 55 {Opt_err, NULL}, 56 }; 57 58 inline int p9_is_proto_dotl(struct p9_client *clnt) 59 { 60 return clnt->proto_version == p9_proto_2000L; 61 } 62 EXPORT_SYMBOL(p9_is_proto_dotl); 63 64 inline int p9_is_proto_dotu(struct p9_client *clnt) 65 { 66 return clnt->proto_version == p9_proto_2000u; 67 } 68 EXPORT_SYMBOL(p9_is_proto_dotu); 69 70 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt) 71 { 72 if (clnt->msize != DEFAULT_MSIZE) 73 seq_printf(m, ",msize=%u", clnt->msize); 74 seq_printf(m, ",trans=%s", clnt->trans_mod->name); 75 76 switch (clnt->proto_version) { 77 case p9_proto_legacy: 78 seq_puts(m, ",noextend"); 79 break; 80 case p9_proto_2000u: 81 seq_puts(m, ",version=9p2000.u"); 82 break; 83 case p9_proto_2000L: 84 /* Default */ 85 break; 86 } 87 88 if (clnt->trans_mod->show_options) 89 return clnt->trans_mod->show_options(m, clnt); 90 return 0; 91 } 92 EXPORT_SYMBOL(p9_show_client_options); 93 94 /* Some error codes are taken directly from the server replies, 95 * make sure they are valid. 96 */ 97 static int safe_errno(int err) 98 { 99 if (err > 0 || err < -MAX_ERRNO) { 100 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err); 101 return -EPROTO; 102 } 103 return err; 104 } 105 106 /* Interpret mount option for protocol version */ 107 static int get_protocol_version(char *s) 108 { 109 int version = -EINVAL; 110 111 if (!strcmp(s, "9p2000")) { 112 version = p9_proto_legacy; 113 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n"); 114 } else if (!strcmp(s, "9p2000.u")) { 115 version = p9_proto_2000u; 116 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); 117 } else if (!strcmp(s, "9p2000.L")) { 118 version = p9_proto_2000L; 119 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); 120 } else { 121 pr_info("Unknown protocol version %s\n", s); 122 } 123 124 return version; 125 } 126 127 /** 128 * parse_opts - parse mount options into client structure 129 * @opts: options string passed from mount 130 * @clnt: existing v9fs client information 131 * 132 * Return 0 upon success, -ERRNO upon failure 133 */ 134 135 static int parse_opts(char *opts, struct p9_client *clnt) 136 { 137 char *options, *tmp_options; 138 char *p; 139 substring_t args[MAX_OPT_ARGS]; 140 int option; 141 char *s; 142 int ret = 0; 143 144 clnt->proto_version = p9_proto_2000L; 145 clnt->msize = DEFAULT_MSIZE; 146 147 if (!opts) 148 return 0; 149 150 tmp_options = kstrdup(opts, GFP_KERNEL); 151 if (!tmp_options) 152 return -ENOMEM; 153 options = tmp_options; 154 155 while ((p = strsep(&options, ",")) != NULL) { 156 int token, r; 157 158 if (!*p) 159 continue; 160 token = match_token(p, tokens, args); 161 switch (token) { 162 case Opt_msize: 163 r = match_int(&args[0], &option); 164 if (r < 0) { 165 p9_debug(P9_DEBUG_ERROR, 166 "integer field, but no integer?\n"); 167 ret = r; 168 continue; 169 } 170 if (option < 4096) { 171 p9_debug(P9_DEBUG_ERROR, 172 "msize should be at least 4k\n"); 173 ret = -EINVAL; 174 continue; 175 } 176 clnt->msize = option; 177 break; 178 case Opt_trans: 179 s = match_strdup(&args[0]); 180 if (!s) { 181 ret = -ENOMEM; 182 p9_debug(P9_DEBUG_ERROR, 183 "problem allocating copy of trans arg\n"); 184 goto free_and_return; 185 } 186 187 v9fs_put_trans(clnt->trans_mod); 188 clnt->trans_mod = v9fs_get_trans_by_name(s); 189 if (!clnt->trans_mod) { 190 pr_info("Could not find request transport: %s\n", 191 s); 192 ret = -EINVAL; 193 } 194 kfree(s); 195 break; 196 case Opt_legacy: 197 clnt->proto_version = p9_proto_legacy; 198 break; 199 case Opt_version: 200 s = match_strdup(&args[0]); 201 if (!s) { 202 ret = -ENOMEM; 203 p9_debug(P9_DEBUG_ERROR, 204 "problem allocating copy of version arg\n"); 205 goto free_and_return; 206 } 207 r = get_protocol_version(s); 208 if (r < 0) 209 ret = r; 210 else 211 clnt->proto_version = r; 212 kfree(s); 213 break; 214 default: 215 continue; 216 } 217 } 218 219 free_and_return: 220 if (ret) 221 v9fs_put_trans(clnt->trans_mod); 222 kfree(tmp_options); 223 return ret; 224 } 225 226 static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc, 227 int alloc_msize) 228 { 229 if (likely(c->fcall_cache) && alloc_msize == c->msize) { 230 fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS); 231 fc->cache = c->fcall_cache; 232 } else { 233 fc->sdata = kmalloc(alloc_msize, GFP_NOFS); 234 fc->cache = NULL; 235 } 236 if (!fc->sdata) 237 return -ENOMEM; 238 fc->capacity = alloc_msize; 239 return 0; 240 } 241 242 void p9_fcall_fini(struct p9_fcall *fc) 243 { 244 /* sdata can be NULL for interrupted requests in trans_rdma, 245 * and kmem_cache_free does not do NULL-check for us 246 */ 247 if (unlikely(!fc->sdata)) 248 return; 249 250 if (fc->cache) 251 kmem_cache_free(fc->cache, fc->sdata); 252 else 253 kfree(fc->sdata); 254 } 255 EXPORT_SYMBOL(p9_fcall_fini); 256 257 static struct kmem_cache *p9_req_cache; 258 259 /** 260 * p9_tag_alloc - Allocate a new request. 261 * @c: Client session. 262 * @type: Transaction type. 263 * @t_size: Buffer size for holding this request 264 * (automatic calculation by format template if 0). 265 * @r_size: Buffer size for holding server's reply on this request 266 * (automatic calculation by format template if 0). 267 * @fmt: Format template for assembling 9p request message 268 * (see p9pdu_vwritef). 269 * @ap: Variable arguments to be fed to passed format template 270 * (see p9pdu_vwritef). 271 * 272 * Context: Process context. 273 * Return: Pointer to new request. 274 */ 275 static struct p9_req_t * 276 p9_tag_alloc(struct p9_client *c, int8_t type, uint t_size, uint r_size, 277 const char *fmt, va_list ap) 278 { 279 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); 280 int alloc_tsize; 281 int alloc_rsize; 282 int tag; 283 va_list apc; 284 285 va_copy(apc, ap); 286 alloc_tsize = min_t(size_t, c->msize, 287 t_size ?: p9_msg_buf_size(c, type, fmt, apc)); 288 va_end(apc); 289 290 alloc_rsize = min_t(size_t, c->msize, 291 r_size ?: p9_msg_buf_size(c, type + 1, fmt, ap)); 292 293 if (!req) 294 return ERR_PTR(-ENOMEM); 295 296 if (p9_fcall_init(c, &req->tc, alloc_tsize)) 297 goto free_req; 298 if (p9_fcall_init(c, &req->rc, alloc_rsize)) 299 goto free; 300 301 p9pdu_reset(&req->tc); 302 p9pdu_reset(&req->rc); 303 req->t_err = 0; 304 req->status = REQ_STATUS_ALLOC; 305 /* refcount needs to be set to 0 before inserting into the idr 306 * so p9_tag_lookup does not accept a request that is not fully 307 * initialized. refcount_set to 2 below will mark request ready. 308 */ 309 refcount_set(&req->refcount, 0); 310 init_waitqueue_head(&req->wq); 311 INIT_LIST_HEAD(&req->req_list); 312 313 idr_preload(GFP_NOFS); 314 spin_lock_irq(&c->lock); 315 if (type == P9_TVERSION) 316 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1, 317 GFP_NOWAIT); 318 else 319 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT); 320 req->tc.tag = tag; 321 spin_unlock_irq(&c->lock); 322 idr_preload_end(); 323 if (tag < 0) 324 goto free; 325 326 /* Init ref to two because in the general case there is one ref 327 * that is put asynchronously by a writer thread, one ref 328 * temporarily given by p9_tag_lookup and put by p9_client_cb 329 * in the recv thread, and one ref put by p9_req_put in the 330 * main thread. The only exception is virtio that does not use 331 * p9_tag_lookup but does not have a writer thread either 332 * (the write happens synchronously in the request/zc_request 333 * callback), so p9_client_cb eats the second ref there 334 * as the pointer is duplicated directly by virtqueue_add_sgs() 335 */ 336 refcount_set(&req->refcount, 2); 337 338 return req; 339 340 free: 341 p9_fcall_fini(&req->tc); 342 p9_fcall_fini(&req->rc); 343 free_req: 344 kmem_cache_free(p9_req_cache, req); 345 return ERR_PTR(-ENOMEM); 346 } 347 348 /** 349 * p9_tag_lookup - Look up a request by tag. 350 * @c: Client session. 351 * @tag: Transaction ID. 352 * 353 * Context: Any context. 354 * Return: A request, or %NULL if there is no request with that tag. 355 */ 356 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 357 { 358 struct p9_req_t *req; 359 360 rcu_read_lock(); 361 again: 362 req = idr_find(&c->reqs, tag); 363 if (req) { 364 /* We have to be careful with the req found under rcu_read_lock 365 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the 366 * ref again without corrupting other data, then check again 367 * that the tag matches once we have the ref 368 */ 369 if (!p9_req_try_get(req)) 370 goto again; 371 if (req->tc.tag != tag) { 372 p9_req_put(c, req); 373 goto again; 374 } 375 } 376 rcu_read_unlock(); 377 378 return req; 379 } 380 EXPORT_SYMBOL(p9_tag_lookup); 381 382 /** 383 * p9_tag_remove - Remove a tag. 384 * @c: Client session. 385 * @r: Request of reference. 386 * 387 * Context: Any context. 388 */ 389 static void p9_tag_remove(struct p9_client *c, struct p9_req_t *r) 390 { 391 unsigned long flags; 392 u16 tag = r->tc.tag; 393 394 p9_debug(P9_DEBUG_MUX, "freeing clnt %p req %p tag: %d\n", c, r, tag); 395 spin_lock_irqsave(&c->lock, flags); 396 idr_remove(&c->reqs, tag); 397 spin_unlock_irqrestore(&c->lock, flags); 398 } 399 400 int p9_req_put(struct p9_client *c, struct p9_req_t *r) 401 { 402 if (refcount_dec_and_test(&r->refcount)) { 403 p9_tag_remove(c, r); 404 405 p9_fcall_fini(&r->tc); 406 p9_fcall_fini(&r->rc); 407 kmem_cache_free(p9_req_cache, r); 408 return 1; 409 } 410 return 0; 411 } 412 EXPORT_SYMBOL(p9_req_put); 413 414 /** 415 * p9_tag_cleanup - cleans up tags structure and reclaims resources 416 * @c: v9fs client struct 417 * 418 * This frees resources associated with the tags structure 419 * 420 */ 421 static void p9_tag_cleanup(struct p9_client *c) 422 { 423 struct p9_req_t *req; 424 int id; 425 426 rcu_read_lock(); 427 idr_for_each_entry(&c->reqs, req, id) { 428 pr_info("Tag %d still in use\n", id); 429 if (p9_req_put(c, req) == 0) 430 pr_warn("Packet with tag %d has still references", 431 req->tc.tag); 432 } 433 rcu_read_unlock(); 434 } 435 436 /** 437 * p9_client_cb - call back from transport to client 438 * @c: client state 439 * @req: request received 440 * @status: request status, one of REQ_STATUS_* 441 * 442 */ 443 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) 444 { 445 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); 446 447 /* This barrier is needed to make sure any change made to req before 448 * the status change is visible to another thread 449 */ 450 smp_wmb(); 451 WRITE_ONCE(req->status, status); 452 453 wake_up(&req->wq); 454 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); 455 p9_req_put(c, req); 456 } 457 EXPORT_SYMBOL(p9_client_cb); 458 459 /** 460 * p9_parse_header - parse header arguments out of a packet 461 * @pdu: packet to parse 462 * @size: size of packet 463 * @type: type of request 464 * @tag: tag of packet 465 * @rewind: set if we need to rewind offset afterwards 466 */ 467 468 int 469 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, 470 int16_t *tag, int rewind) 471 { 472 s8 r_type; 473 s16 r_tag; 474 s32 r_size; 475 int offset = pdu->offset; 476 int err; 477 478 pdu->offset = 0; 479 480 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 481 if (err) 482 goto rewind_and_exit; 483 484 if (type) 485 *type = r_type; 486 if (tag) 487 *tag = r_tag; 488 if (size) 489 *size = r_size; 490 491 if (pdu->size != r_size || r_size < 7) { 492 err = -EINVAL; 493 goto rewind_and_exit; 494 } 495 496 pdu->id = r_type; 497 pdu->tag = r_tag; 498 499 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 500 pdu->size, pdu->id, pdu->tag); 501 502 rewind_and_exit: 503 if (rewind) 504 pdu->offset = offset; 505 return err; 506 } 507 EXPORT_SYMBOL(p9_parse_header); 508 509 /** 510 * p9_check_errors - check 9p packet for error return and process it 511 * @c: current client instance 512 * @req: request to parse and check for error conditions 513 * 514 * returns error code if one is discovered, otherwise returns 0 515 * 516 * this will have to be more complicated if we have multiple 517 * error packet types 518 */ 519 520 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 521 { 522 s8 type; 523 int err; 524 int ecode; 525 526 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 527 if (req->rc.size > req->rc.capacity && !req->rc.zc) { 528 pr_err("requested packet size too big: %d does not fit %zu (type=%d)\n", 529 req->rc.size, req->rc.capacity, req->rc.id); 530 return -EIO; 531 } 532 /* dump the response from server 533 * This should be after check errors which poplulate pdu_fcall. 534 */ 535 trace_9p_protocol_dump(c, &req->rc); 536 if (err) { 537 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 538 return err; 539 } 540 if (type != P9_RERROR && type != P9_RLERROR) 541 return 0; 542 543 if (!p9_is_proto_dotl(c)) { 544 char *ename = NULL; 545 546 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 547 &ename, &ecode); 548 if (err) { 549 kfree(ename); 550 goto out_err; 551 } 552 553 if (p9_is_proto_dotu(c) && ecode < 512) 554 err = -ecode; 555 556 if (!err) { 557 err = p9_errstr2errno(ename, strlen(ename)); 558 559 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 560 -ecode, ename); 561 } 562 kfree(ename); 563 } else { 564 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 565 if (err) 566 goto out_err; 567 err = -ecode; 568 569 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 570 } 571 572 return err; 573 574 out_err: 575 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 576 577 return err; 578 } 579 580 static struct p9_req_t * 581 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 582 583 /** 584 * p9_client_flush - flush (cancel) a request 585 * @c: client state 586 * @oldreq: request to cancel 587 * 588 * This sents a flush for a particular request and links 589 * the flush request to the original request. The current 590 * code only supports a single flush request although the protocol 591 * allows for multiple flush requests to be sent for a single request. 592 * 593 */ 594 595 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 596 { 597 struct p9_req_t *req; 598 s16 oldtag; 599 int err; 600 601 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); 602 if (err) 603 return err; 604 605 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 606 607 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 608 if (IS_ERR(req)) 609 return PTR_ERR(req); 610 611 /* if we haven't received a response for oldreq, 612 * remove it from the list 613 */ 614 if (READ_ONCE(oldreq->status) == REQ_STATUS_SENT) { 615 if (c->trans_mod->cancelled) 616 c->trans_mod->cancelled(c, oldreq); 617 } 618 619 p9_req_put(c, req); 620 return 0; 621 } 622 623 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 624 int8_t type, uint t_size, uint r_size, 625 const char *fmt, va_list ap) 626 { 627 int err; 628 struct p9_req_t *req; 629 va_list apc; 630 631 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 632 633 /* we allow for any status other than disconnected */ 634 if (c->status == Disconnected) 635 return ERR_PTR(-EIO); 636 637 /* if status is begin_disconnected we allow only clunk request */ 638 if (c->status == BeginDisconnect && type != P9_TCLUNK) 639 return ERR_PTR(-EIO); 640 641 va_copy(apc, ap); 642 req = p9_tag_alloc(c, type, t_size, r_size, fmt, apc); 643 va_end(apc); 644 if (IS_ERR(req)) 645 return req; 646 647 /* marshall the data */ 648 p9pdu_prepare(&req->tc, req->tc.tag, type); 649 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); 650 if (err) 651 goto reterr; 652 p9pdu_finalize(c, &req->tc); 653 trace_9p_client_req(c, type, req->tc.tag); 654 return req; 655 reterr: 656 p9_req_put(c, req); 657 /* We have to put also the 2nd reference as it won't be used */ 658 p9_req_put(c, req); 659 return ERR_PTR(err); 660 } 661 662 /** 663 * p9_client_rpc - issue a request and wait for a response 664 * @c: client session 665 * @type: type of request 666 * @fmt: protocol format string (see protocol.c) 667 * 668 * Returns request structure (which client must free using p9_req_put) 669 */ 670 671 static struct p9_req_t * 672 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 673 { 674 va_list ap; 675 int sigpending, err; 676 unsigned long flags; 677 struct p9_req_t *req; 678 /* Passing zero for tsize/rsize to p9_client_prepare_req() tells it to 679 * auto determine an appropriate (small) request/response size 680 * according to actual message data being sent. Currently RDMA 681 * transport is excluded from this response message size optimization, 682 * as it would not cope with it, due to its pooled response buffers 683 * (using an optimized request size for RDMA as well though). 684 */ 685 const uint tsize = 0; 686 const uint rsize = c->trans_mod->pooled_rbuffers ? c->msize : 0; 687 688 va_start(ap, fmt); 689 req = p9_client_prepare_req(c, type, tsize, rsize, fmt, ap); 690 va_end(ap); 691 if (IS_ERR(req)) 692 return req; 693 694 req->tc.zc = false; 695 req->rc.zc = false; 696 697 if (signal_pending(current)) { 698 sigpending = 1; 699 clear_thread_flag(TIF_SIGPENDING); 700 } else { 701 sigpending = 0; 702 } 703 704 err = c->trans_mod->request(c, req); 705 if (err < 0) { 706 /* write won't happen */ 707 p9_req_put(c, req); 708 if (err != -ERESTARTSYS && err != -EFAULT) 709 c->status = Disconnected; 710 goto recalc_sigpending; 711 } 712 again: 713 /* Wait for the response */ 714 err = wait_event_killable(req->wq, 715 READ_ONCE(req->status) >= REQ_STATUS_RCVD); 716 717 /* Make sure our req is coherent with regard to updates in other 718 * threads - echoes to wmb() in the callback 719 */ 720 smp_rmb(); 721 722 if (err == -ERESTARTSYS && c->status == Connected && 723 type == P9_TFLUSH) { 724 sigpending = 1; 725 clear_thread_flag(TIF_SIGPENDING); 726 goto again; 727 } 728 729 if (READ_ONCE(req->status) == REQ_STATUS_ERROR) { 730 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 731 err = req->t_err; 732 } 733 if (err == -ERESTARTSYS && c->status == Connected) { 734 p9_debug(P9_DEBUG_MUX, "flushing\n"); 735 sigpending = 1; 736 clear_thread_flag(TIF_SIGPENDING); 737 738 if (c->trans_mod->cancel(c, req)) 739 p9_client_flush(c, req); 740 741 /* if we received the response anyway, don't signal error */ 742 if (READ_ONCE(req->status) == REQ_STATUS_RCVD) 743 err = 0; 744 } 745 recalc_sigpending: 746 if (sigpending) { 747 spin_lock_irqsave(¤t->sighand->siglock, flags); 748 recalc_sigpending(); 749 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 750 } 751 if (err < 0) 752 goto reterr; 753 754 err = p9_check_errors(c, req); 755 trace_9p_client_res(c, type, req->rc.tag, err); 756 if (!err) 757 return req; 758 reterr: 759 p9_req_put(c, req); 760 return ERR_PTR(safe_errno(err)); 761 } 762 763 /** 764 * p9_client_zc_rpc - issue a request and wait for a response 765 * @c: client session 766 * @type: type of request 767 * @uidata: destination for zero copy read 768 * @uodata: source for zero copy write 769 * @inlen: read buffer size 770 * @olen: write buffer size 771 * @in_hdrlen: reader header size, This is the size of response protocol data 772 * @fmt: protocol format string (see protocol.c) 773 * 774 * Returns request structure (which client must free using p9_req_put) 775 */ 776 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 777 struct iov_iter *uidata, 778 struct iov_iter *uodata, 779 int inlen, int olen, int in_hdrlen, 780 const char *fmt, ...) 781 { 782 va_list ap; 783 int sigpending, err; 784 unsigned long flags; 785 struct p9_req_t *req; 786 787 va_start(ap, fmt); 788 /* We allocate a inline protocol data of only 4k bytes. 789 * The actual content is passed in zero-copy fashion. 790 */ 791 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, P9_ZC_HDR_SZ, fmt, ap); 792 va_end(ap); 793 if (IS_ERR(req)) 794 return req; 795 796 req->tc.zc = true; 797 req->rc.zc = true; 798 799 if (signal_pending(current)) { 800 sigpending = 1; 801 clear_thread_flag(TIF_SIGPENDING); 802 } else { 803 sigpending = 0; 804 } 805 806 err = c->trans_mod->zc_request(c, req, uidata, uodata, 807 inlen, olen, in_hdrlen); 808 if (err < 0) { 809 if (err == -EIO) 810 c->status = Disconnected; 811 if (err != -ERESTARTSYS) 812 goto recalc_sigpending; 813 } 814 if (READ_ONCE(req->status) == REQ_STATUS_ERROR) { 815 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 816 err = req->t_err; 817 } 818 if (err == -ERESTARTSYS && c->status == Connected) { 819 p9_debug(P9_DEBUG_MUX, "flushing\n"); 820 sigpending = 1; 821 clear_thread_flag(TIF_SIGPENDING); 822 823 if (c->trans_mod->cancel(c, req)) 824 p9_client_flush(c, req); 825 826 /* if we received the response anyway, don't signal error */ 827 if (READ_ONCE(req->status) == REQ_STATUS_RCVD) 828 err = 0; 829 } 830 recalc_sigpending: 831 if (sigpending) { 832 spin_lock_irqsave(¤t->sighand->siglock, flags); 833 recalc_sigpending(); 834 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 835 } 836 if (err < 0) 837 goto reterr; 838 839 err = p9_check_errors(c, req); 840 trace_9p_client_res(c, type, req->rc.tag, err); 841 if (!err) 842 return req; 843 reterr: 844 p9_req_put(c, req); 845 return ERR_PTR(safe_errno(err)); 846 } 847 848 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 849 { 850 int ret; 851 struct p9_fid *fid; 852 853 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 854 fid = kzalloc(sizeof(*fid), GFP_KERNEL); 855 if (!fid) 856 return NULL; 857 858 fid->mode = -1; 859 fid->uid = current_fsuid(); 860 fid->clnt = clnt; 861 refcount_set(&fid->count, 1); 862 863 idr_preload(GFP_KERNEL); 864 spin_lock_irq(&clnt->lock); 865 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, 866 GFP_NOWAIT); 867 spin_unlock_irq(&clnt->lock); 868 idr_preload_end(); 869 if (!ret) { 870 trace_9p_fid_ref(fid, P9_FID_REF_CREATE); 871 return fid; 872 } 873 874 kfree(fid); 875 return NULL; 876 } 877 878 static void p9_fid_destroy(struct p9_fid *fid) 879 { 880 struct p9_client *clnt; 881 unsigned long flags; 882 883 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 884 trace_9p_fid_ref(fid, P9_FID_REF_DESTROY); 885 clnt = fid->clnt; 886 spin_lock_irqsave(&clnt->lock, flags); 887 idr_remove(&clnt->fids, fid->fid); 888 spin_unlock_irqrestore(&clnt->lock, flags); 889 kfree(fid->rdir); 890 kfree(fid); 891 } 892 893 /* We also need to export tracepoint symbols for tracepoint_enabled() */ 894 EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref); 895 896 void do_trace_9p_fid_get(struct p9_fid *fid) 897 { 898 trace_9p_fid_ref(fid, P9_FID_REF_GET); 899 } 900 EXPORT_SYMBOL(do_trace_9p_fid_get); 901 902 void do_trace_9p_fid_put(struct p9_fid *fid) 903 { 904 trace_9p_fid_ref(fid, P9_FID_REF_PUT); 905 } 906 EXPORT_SYMBOL(do_trace_9p_fid_put); 907 908 static int p9_client_version(struct p9_client *c) 909 { 910 int err; 911 struct p9_req_t *req; 912 char *version = NULL; 913 int msize; 914 915 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 916 c->msize, c->proto_version); 917 918 switch (c->proto_version) { 919 case p9_proto_2000L: 920 req = p9_client_rpc(c, P9_TVERSION, "ds", 921 c->msize, "9P2000.L"); 922 break; 923 case p9_proto_2000u: 924 req = p9_client_rpc(c, P9_TVERSION, "ds", 925 c->msize, "9P2000.u"); 926 break; 927 case p9_proto_legacy: 928 req = p9_client_rpc(c, P9_TVERSION, "ds", 929 c->msize, "9P2000"); 930 break; 931 default: 932 return -EINVAL; 933 } 934 935 if (IS_ERR(req)) 936 return PTR_ERR(req); 937 938 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); 939 if (err) { 940 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 941 trace_9p_protocol_dump(c, &req->rc); 942 goto error; 943 } 944 945 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 946 if (!strncmp(version, "9P2000.L", 8)) { 947 c->proto_version = p9_proto_2000L; 948 } else if (!strncmp(version, "9P2000.u", 8)) { 949 c->proto_version = p9_proto_2000u; 950 } else if (!strncmp(version, "9P2000", 6)) { 951 c->proto_version = p9_proto_legacy; 952 } else { 953 p9_debug(P9_DEBUG_ERROR, 954 "server returned an unknown version: %s\n", version); 955 err = -EREMOTEIO; 956 goto error; 957 } 958 959 if (msize < 4096) { 960 p9_debug(P9_DEBUG_ERROR, 961 "server returned a msize < 4096: %d\n", msize); 962 err = -EREMOTEIO; 963 goto error; 964 } 965 if (msize < c->msize) 966 c->msize = msize; 967 968 error: 969 kfree(version); 970 p9_req_put(c, req); 971 972 return err; 973 } 974 975 struct p9_client *p9_client_create(const char *dev_name, char *options) 976 { 977 int err; 978 struct p9_client *clnt; 979 char *client_id; 980 981 clnt = kmalloc(sizeof(*clnt), GFP_KERNEL); 982 if (!clnt) 983 return ERR_PTR(-ENOMEM); 984 985 clnt->trans_mod = NULL; 986 clnt->trans = NULL; 987 clnt->fcall_cache = NULL; 988 989 client_id = utsname()->nodename; 990 memcpy(clnt->name, client_id, strlen(client_id) + 1); 991 992 spin_lock_init(&clnt->lock); 993 idr_init(&clnt->fids); 994 idr_init(&clnt->reqs); 995 996 err = parse_opts(options, clnt); 997 if (err < 0) 998 goto free_client; 999 1000 if (!clnt->trans_mod) 1001 clnt->trans_mod = v9fs_get_default_trans(); 1002 1003 if (!clnt->trans_mod) { 1004 err = -EPROTONOSUPPORT; 1005 p9_debug(P9_DEBUG_ERROR, 1006 "No transport defined or default transport\n"); 1007 goto free_client; 1008 } 1009 1010 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1011 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1012 1013 err = clnt->trans_mod->create(clnt, dev_name, options); 1014 if (err) 1015 goto put_trans; 1016 1017 if (clnt->msize > clnt->trans_mod->maxsize) { 1018 clnt->msize = clnt->trans_mod->maxsize; 1019 pr_info("Limiting 'msize' to %d as this is the maximum " 1020 "supported by transport %s\n", 1021 clnt->msize, clnt->trans_mod->name 1022 ); 1023 } 1024 1025 if (clnt->msize < 4096) { 1026 p9_debug(P9_DEBUG_ERROR, 1027 "Please specify a msize of at least 4k\n"); 1028 err = -EINVAL; 1029 goto close_trans; 1030 } 1031 1032 err = p9_client_version(clnt); 1033 if (err) 1034 goto close_trans; 1035 1036 /* P9_HDRSZ + 4 is the smallest packet header we can have that is 1037 * followed by data accessed from userspace by read 1038 */ 1039 clnt->fcall_cache = 1040 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, 1041 0, 0, P9_HDRSZ + 4, 1042 clnt->msize - (P9_HDRSZ + 4), 1043 NULL); 1044 1045 return clnt; 1046 1047 close_trans: 1048 clnt->trans_mod->close(clnt); 1049 put_trans: 1050 v9fs_put_trans(clnt->trans_mod); 1051 free_client: 1052 kfree(clnt); 1053 return ERR_PTR(err); 1054 } 1055 EXPORT_SYMBOL(p9_client_create); 1056 1057 void p9_client_destroy(struct p9_client *clnt) 1058 { 1059 struct p9_fid *fid; 1060 int id; 1061 1062 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1063 1064 if (clnt->trans_mod) 1065 clnt->trans_mod->close(clnt); 1066 1067 v9fs_put_trans(clnt->trans_mod); 1068 1069 idr_for_each_entry(&clnt->fids, fid, id) { 1070 pr_info("Found fid %d not clunked\n", fid->fid); 1071 p9_fid_destroy(fid); 1072 } 1073 1074 p9_tag_cleanup(clnt); 1075 1076 kmem_cache_destroy(clnt->fcall_cache); 1077 kfree(clnt); 1078 } 1079 EXPORT_SYMBOL(p9_client_destroy); 1080 1081 void p9_client_disconnect(struct p9_client *clnt) 1082 { 1083 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1084 clnt->status = Disconnected; 1085 } 1086 EXPORT_SYMBOL(p9_client_disconnect); 1087 1088 void p9_client_begin_disconnect(struct p9_client *clnt) 1089 { 1090 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1091 clnt->status = BeginDisconnect; 1092 } 1093 EXPORT_SYMBOL(p9_client_begin_disconnect); 1094 1095 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1096 const char *uname, kuid_t n_uname, 1097 const char *aname) 1098 { 1099 int err; 1100 struct p9_req_t *req; 1101 struct p9_fid *fid; 1102 struct p9_qid qid; 1103 1104 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1105 afid ? afid->fid : -1, uname, aname); 1106 fid = p9_fid_create(clnt); 1107 if (!fid) { 1108 err = -ENOMEM; 1109 goto error; 1110 } 1111 fid->uid = n_uname; 1112 1113 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1114 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1115 if (IS_ERR(req)) { 1116 err = PTR_ERR(req); 1117 goto error; 1118 } 1119 1120 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); 1121 if (err) { 1122 trace_9p_protocol_dump(clnt, &req->rc); 1123 p9_req_put(clnt, req); 1124 goto error; 1125 } 1126 1127 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1128 qid.type, qid.path, qid.version); 1129 1130 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1131 1132 p9_req_put(clnt, req); 1133 return fid; 1134 1135 error: 1136 if (fid) 1137 p9_fid_destroy(fid); 1138 return ERR_PTR(err); 1139 } 1140 EXPORT_SYMBOL(p9_client_attach); 1141 1142 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1143 const unsigned char * const *wnames, int clone) 1144 { 1145 int err; 1146 struct p9_client *clnt; 1147 struct p9_fid *fid; 1148 struct p9_qid *wqids; 1149 struct p9_req_t *req; 1150 u16 nwqids, count; 1151 1152 wqids = NULL; 1153 clnt = oldfid->clnt; 1154 if (clone) { 1155 fid = p9_fid_create(clnt); 1156 if (!fid) { 1157 err = -ENOMEM; 1158 goto error; 1159 } 1160 1161 fid->uid = oldfid->uid; 1162 } else { 1163 fid = oldfid; 1164 } 1165 1166 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1167 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1168 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1169 nwname, wnames); 1170 if (IS_ERR(req)) { 1171 err = PTR_ERR(req); 1172 goto error; 1173 } 1174 1175 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1176 if (err) { 1177 trace_9p_protocol_dump(clnt, &req->rc); 1178 p9_req_put(clnt, req); 1179 goto clunk_fid; 1180 } 1181 p9_req_put(clnt, req); 1182 1183 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1184 1185 if (nwqids != nwname) { 1186 err = -ENOENT; 1187 goto clunk_fid; 1188 } 1189 1190 for (count = 0; count < nwqids; count++) 1191 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1192 count, wqids[count].type, 1193 wqids[count].path, 1194 wqids[count].version); 1195 1196 if (nwname) 1197 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1198 else 1199 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); 1200 1201 kfree(wqids); 1202 return fid; 1203 1204 clunk_fid: 1205 kfree(wqids); 1206 p9_fid_put(fid); 1207 fid = NULL; 1208 1209 error: 1210 if (fid && fid != oldfid) 1211 p9_fid_destroy(fid); 1212 1213 return ERR_PTR(err); 1214 } 1215 EXPORT_SYMBOL(p9_client_walk); 1216 1217 int p9_client_open(struct p9_fid *fid, int mode) 1218 { 1219 int err; 1220 struct p9_client *clnt; 1221 struct p9_req_t *req; 1222 struct p9_qid qid; 1223 int iounit; 1224 1225 clnt = fid->clnt; 1226 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1227 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1228 1229 if (fid->mode != -1) 1230 return -EINVAL; 1231 1232 if (p9_is_proto_dotl(clnt)) 1233 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode & P9L_MODE_MASK); 1234 else 1235 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode & P9L_MODE_MASK); 1236 if (IS_ERR(req)) { 1237 err = PTR_ERR(req); 1238 goto error; 1239 } 1240 1241 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1242 if (err) { 1243 trace_9p_protocol_dump(clnt, &req->rc); 1244 goto free_and_error; 1245 } 1246 1247 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1248 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1249 qid.path, qid.version, iounit); 1250 1251 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1252 fid->mode = mode; 1253 fid->iounit = iounit; 1254 1255 free_and_error: 1256 p9_req_put(clnt, req); 1257 error: 1258 return err; 1259 } 1260 EXPORT_SYMBOL(p9_client_open); 1261 1262 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, 1263 u32 mode, kgid_t gid, struct p9_qid *qid) 1264 { 1265 int err; 1266 struct p9_client *clnt; 1267 struct p9_req_t *req; 1268 int iounit; 1269 1270 p9_debug(P9_DEBUG_9P, 1271 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1272 ofid->fid, name, flags, mode, 1273 from_kgid(&init_user_ns, gid)); 1274 clnt = ofid->clnt; 1275 1276 if (ofid->mode != -1) 1277 return -EINVAL; 1278 1279 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1280 mode & P9L_MODE_MASK, gid); 1281 if (IS_ERR(req)) { 1282 err = PTR_ERR(req); 1283 goto error; 1284 } 1285 1286 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); 1287 if (err) { 1288 trace_9p_protocol_dump(clnt, &req->rc); 1289 goto free_and_error; 1290 } 1291 1292 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1293 qid->type, qid->path, qid->version, iounit); 1294 1295 memmove(&ofid->qid, qid, sizeof(struct p9_qid)); 1296 ofid->mode = flags; 1297 ofid->iounit = iounit; 1298 1299 free_and_error: 1300 p9_req_put(clnt, req); 1301 error: 1302 return err; 1303 } 1304 EXPORT_SYMBOL(p9_client_create_dotl); 1305 1306 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1307 char *extension) 1308 { 1309 int err; 1310 struct p9_client *clnt; 1311 struct p9_req_t *req; 1312 struct p9_qid qid; 1313 int iounit; 1314 1315 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1316 fid->fid, name, perm, mode); 1317 clnt = fid->clnt; 1318 1319 if (fid->mode != -1) 1320 return -EINVAL; 1321 1322 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1323 mode & P9L_MODE_MASK, extension); 1324 if (IS_ERR(req)) { 1325 err = PTR_ERR(req); 1326 goto error; 1327 } 1328 1329 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1330 if (err) { 1331 trace_9p_protocol_dump(clnt, &req->rc); 1332 goto free_and_error; 1333 } 1334 1335 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1336 qid.type, qid.path, qid.version, iounit); 1337 1338 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1339 fid->mode = mode; 1340 fid->iounit = iounit; 1341 1342 free_and_error: 1343 p9_req_put(clnt, req); 1344 error: 1345 return err; 1346 } 1347 EXPORT_SYMBOL(p9_client_fcreate); 1348 1349 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1350 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1351 { 1352 int err; 1353 struct p9_client *clnt; 1354 struct p9_req_t *req; 1355 1356 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1357 dfid->fid, name, symtgt); 1358 clnt = dfid->clnt; 1359 1360 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1361 gid); 1362 if (IS_ERR(req)) { 1363 err = PTR_ERR(req); 1364 goto error; 1365 } 1366 1367 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 1368 if (err) { 1369 trace_9p_protocol_dump(clnt, &req->rc); 1370 goto free_and_error; 1371 } 1372 1373 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1374 qid->type, qid->path, qid->version); 1375 1376 free_and_error: 1377 p9_req_put(clnt, req); 1378 error: 1379 return err; 1380 } 1381 EXPORT_SYMBOL(p9_client_symlink); 1382 1383 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1384 { 1385 struct p9_client *clnt; 1386 struct p9_req_t *req; 1387 1388 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1389 dfid->fid, oldfid->fid, newname); 1390 clnt = dfid->clnt; 1391 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1392 newname); 1393 if (IS_ERR(req)) 1394 return PTR_ERR(req); 1395 1396 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1397 p9_req_put(clnt, req); 1398 return 0; 1399 } 1400 EXPORT_SYMBOL(p9_client_link); 1401 1402 int p9_client_fsync(struct p9_fid *fid, int datasync) 1403 { 1404 int err = 0; 1405 struct p9_client *clnt; 1406 struct p9_req_t *req; 1407 1408 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1409 fid->fid, datasync); 1410 clnt = fid->clnt; 1411 1412 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1413 if (IS_ERR(req)) { 1414 err = PTR_ERR(req); 1415 goto error; 1416 } 1417 1418 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1419 1420 p9_req_put(clnt, req); 1421 1422 error: 1423 return err; 1424 } 1425 EXPORT_SYMBOL(p9_client_fsync); 1426 1427 int p9_client_clunk(struct p9_fid *fid) 1428 { 1429 int err = 0; 1430 struct p9_client *clnt; 1431 struct p9_req_t *req; 1432 int retries = 0; 1433 1434 again: 1435 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", 1436 fid->fid, retries); 1437 clnt = fid->clnt; 1438 1439 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1440 if (IS_ERR(req)) { 1441 err = PTR_ERR(req); 1442 goto error; 1443 } 1444 1445 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1446 1447 p9_req_put(clnt, req); 1448 error: 1449 /* Fid is not valid even after a failed clunk 1450 * If interrupted, retry once then give up and 1451 * leak fid until umount. 1452 */ 1453 if (err == -ERESTARTSYS) { 1454 if (retries++ == 0) 1455 goto again; 1456 } else { 1457 p9_fid_destroy(fid); 1458 } 1459 return err; 1460 } 1461 EXPORT_SYMBOL(p9_client_clunk); 1462 1463 int p9_client_remove(struct p9_fid *fid) 1464 { 1465 int err = 0; 1466 struct p9_client *clnt; 1467 struct p9_req_t *req; 1468 1469 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1470 clnt = fid->clnt; 1471 1472 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1473 if (IS_ERR(req)) { 1474 err = PTR_ERR(req); 1475 goto error; 1476 } 1477 1478 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1479 1480 p9_req_put(clnt, req); 1481 error: 1482 if (err == -ERESTARTSYS) 1483 p9_fid_put(fid); 1484 else 1485 p9_fid_destroy(fid); 1486 return err; 1487 } 1488 EXPORT_SYMBOL(p9_client_remove); 1489 1490 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1491 { 1492 int err = 0; 1493 struct p9_req_t *req; 1494 struct p9_client *clnt; 1495 1496 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1497 dfid->fid, name, flags); 1498 1499 clnt = dfid->clnt; 1500 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1501 if (IS_ERR(req)) { 1502 err = PTR_ERR(req); 1503 goto error; 1504 } 1505 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1506 1507 p9_req_put(clnt, req); 1508 error: 1509 return err; 1510 } 1511 EXPORT_SYMBOL(p9_client_unlinkat); 1512 1513 int 1514 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1515 { 1516 int total = 0; 1517 *err = 0; 1518 1519 while (iov_iter_count(to)) { 1520 int count; 1521 1522 count = p9_client_read_once(fid, offset, to, err); 1523 if (!count || *err) 1524 break; 1525 offset += count; 1526 total += count; 1527 } 1528 return total; 1529 } 1530 EXPORT_SYMBOL(p9_client_read); 1531 1532 int 1533 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, 1534 int *err) 1535 { 1536 struct p9_client *clnt = fid->clnt; 1537 struct p9_req_t *req; 1538 int count = iov_iter_count(to); 1539 int rsize, received, non_zc = 0; 1540 char *dataptr; 1541 1542 *err = 0; 1543 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n", 1544 fid->fid, offset, iov_iter_count(to)); 1545 1546 rsize = fid->iounit; 1547 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1548 rsize = clnt->msize - P9_IOHDRSZ; 1549 1550 if (count < rsize) 1551 rsize = count; 1552 1553 /* Don't bother zerocopy for small IO (< 1024) */ 1554 if (clnt->trans_mod->zc_request && rsize > 1024) { 1555 /* response header len is 11 1556 * PDU Header(7) + IO Size (4) 1557 */ 1558 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1559 0, 11, "dqd", fid->fid, 1560 offset, rsize); 1561 } else { 1562 non_zc = 1; 1563 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1564 rsize); 1565 } 1566 if (IS_ERR(req)) { 1567 *err = PTR_ERR(req); 1568 if (!non_zc) 1569 iov_iter_revert(to, count - iov_iter_count(to)); 1570 return 0; 1571 } 1572 1573 *err = p9pdu_readf(&req->rc, clnt->proto_version, 1574 "D", &received, &dataptr); 1575 if (*err) { 1576 if (!non_zc) 1577 iov_iter_revert(to, count - iov_iter_count(to)); 1578 trace_9p_protocol_dump(clnt, &req->rc); 1579 p9_req_put(clnt, req); 1580 return 0; 1581 } 1582 if (rsize < received) { 1583 pr_err("bogus RREAD count (%d > %d)\n", received, rsize); 1584 received = rsize; 1585 } 1586 1587 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", received); 1588 1589 if (non_zc) { 1590 int n = copy_to_iter(dataptr, received, to); 1591 1592 if (n != received) { 1593 *err = -EFAULT; 1594 p9_req_put(clnt, req); 1595 return n; 1596 } 1597 } else { 1598 iov_iter_revert(to, count - received - iov_iter_count(to)); 1599 } 1600 p9_req_put(clnt, req); 1601 return received; 1602 } 1603 EXPORT_SYMBOL(p9_client_read_once); 1604 1605 int 1606 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1607 { 1608 struct p9_client *clnt = fid->clnt; 1609 struct p9_req_t *req; 1610 int total = 0; 1611 *err = 0; 1612 1613 while (iov_iter_count(from)) { 1614 int count = iov_iter_count(from); 1615 int rsize = fid->iounit; 1616 int written; 1617 1618 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1619 rsize = clnt->msize - P9_IOHDRSZ; 1620 1621 if (count < rsize) 1622 rsize = count; 1623 1624 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d (/%d)\n", 1625 fid->fid, offset, rsize, count); 1626 1627 /* Don't bother zerocopy for small IO (< 1024) */ 1628 if (clnt->trans_mod->zc_request && rsize > 1024) { 1629 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1630 rsize, P9_ZC_HDR_SZ, "dqd", 1631 fid->fid, offset, rsize); 1632 } else { 1633 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1634 offset, rsize, from); 1635 } 1636 if (IS_ERR(req)) { 1637 iov_iter_revert(from, count - iov_iter_count(from)); 1638 *err = PTR_ERR(req); 1639 break; 1640 } 1641 1642 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written); 1643 if (*err) { 1644 iov_iter_revert(from, count - iov_iter_count(from)); 1645 trace_9p_protocol_dump(clnt, &req->rc); 1646 p9_req_put(clnt, req); 1647 break; 1648 } 1649 if (rsize < written) { 1650 pr_err("bogus RWRITE count (%d > %d)\n", written, rsize); 1651 written = rsize; 1652 } 1653 1654 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", written); 1655 1656 p9_req_put(clnt, req); 1657 iov_iter_revert(from, count - written - iov_iter_count(from)); 1658 total += written; 1659 offset += written; 1660 } 1661 return total; 1662 } 1663 EXPORT_SYMBOL(p9_client_write); 1664 1665 void 1666 p9_client_write_subreq(struct netfs_io_subrequest *subreq) 1667 { 1668 struct netfs_io_request *wreq = subreq->rreq; 1669 struct p9_fid *fid = wreq->netfs_priv; 1670 struct p9_client *clnt = fid->clnt; 1671 struct p9_req_t *req; 1672 unsigned long long start = subreq->start + subreq->transferred; 1673 int written, len = subreq->len - subreq->transferred; 1674 int err; 1675 1676 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu len %d\n", 1677 fid->fid, start, len); 1678 1679 /* Don't bother zerocopy for small IO (< 1024) */ 1680 if (clnt->trans_mod->zc_request && len > 1024) { 1681 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, &subreq->io_iter, 1682 0, wreq->len, P9_ZC_HDR_SZ, "dqd", 1683 fid->fid, start, len); 1684 } else { 1685 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1686 start, len, &subreq->io_iter); 1687 } 1688 if (IS_ERR(req)) { 1689 netfs_write_subrequest_terminated(subreq, PTR_ERR(req), false); 1690 return; 1691 } 1692 1693 err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written); 1694 if (err) { 1695 trace_9p_protocol_dump(clnt, &req->rc); 1696 p9_req_put(clnt, req); 1697 netfs_write_subrequest_terminated(subreq, err, false); 1698 return; 1699 } 1700 1701 if (written > len) { 1702 pr_err("bogus RWRITE count (%d > %u)\n", written, len); 1703 written = len; 1704 } 1705 1706 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", len); 1707 1708 p9_req_put(clnt, req); 1709 netfs_write_subrequest_terminated(subreq, written, false); 1710 } 1711 EXPORT_SYMBOL(p9_client_write_subreq); 1712 1713 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1714 { 1715 int err; 1716 struct p9_client *clnt; 1717 struct p9_wstat *ret; 1718 struct p9_req_t *req; 1719 u16 ignored; 1720 1721 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1722 1723 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1724 if (!ret) 1725 return ERR_PTR(-ENOMEM); 1726 1727 clnt = fid->clnt; 1728 1729 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1730 if (IS_ERR(req)) { 1731 err = PTR_ERR(req); 1732 goto error; 1733 } 1734 1735 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); 1736 if (err) { 1737 trace_9p_protocol_dump(clnt, &req->rc); 1738 p9_req_put(clnt, req); 1739 goto error; 1740 } 1741 1742 p9_debug(P9_DEBUG_9P, 1743 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1744 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1745 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1746 "<<< uid=%d gid=%d n_muid=%d\n", 1747 ret->size, ret->type, ret->dev, ret->qid.type, ret->qid.path, 1748 ret->qid.version, ret->mode, 1749 ret->atime, ret->mtime, ret->length, 1750 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1751 from_kuid(&init_user_ns, ret->n_uid), 1752 from_kgid(&init_user_ns, ret->n_gid), 1753 from_kuid(&init_user_ns, ret->n_muid)); 1754 1755 p9_req_put(clnt, req); 1756 return ret; 1757 1758 error: 1759 kfree(ret); 1760 return ERR_PTR(err); 1761 } 1762 EXPORT_SYMBOL(p9_client_stat); 1763 1764 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1765 u64 request_mask) 1766 { 1767 int err; 1768 struct p9_client *clnt; 1769 struct p9_stat_dotl *ret; 1770 struct p9_req_t *req; 1771 1772 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1773 fid->fid, request_mask); 1774 1775 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1776 if (!ret) 1777 return ERR_PTR(-ENOMEM); 1778 1779 clnt = fid->clnt; 1780 1781 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1782 if (IS_ERR(req)) { 1783 err = PTR_ERR(req); 1784 goto error; 1785 } 1786 1787 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); 1788 if (err) { 1789 trace_9p_protocol_dump(clnt, &req->rc); 1790 p9_req_put(clnt, req); 1791 goto error; 1792 } 1793 1794 p9_debug(P9_DEBUG_9P, "<<< RGETATTR st_result_mask=%lld\n" 1795 "<<< qid=%x.%llx.%x\n" 1796 "<<< st_mode=%8.8x st_nlink=%llu\n" 1797 "<<< st_uid=%d st_gid=%d\n" 1798 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1799 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1800 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1801 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1802 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1803 "<<< st_gen=%lld st_data_version=%lld\n", 1804 ret->st_result_mask, 1805 ret->qid.type, ret->qid.path, ret->qid.version, 1806 ret->st_mode, ret->st_nlink, 1807 from_kuid(&init_user_ns, ret->st_uid), 1808 from_kgid(&init_user_ns, ret->st_gid), 1809 ret->st_rdev, ret->st_size, ret->st_blksize, ret->st_blocks, 1810 ret->st_atime_sec, ret->st_atime_nsec, 1811 ret->st_mtime_sec, ret->st_mtime_nsec, 1812 ret->st_ctime_sec, ret->st_ctime_nsec, 1813 ret->st_btime_sec, ret->st_btime_nsec, 1814 ret->st_gen, ret->st_data_version); 1815 1816 p9_req_put(clnt, req); 1817 return ret; 1818 1819 error: 1820 kfree(ret); 1821 return ERR_PTR(err); 1822 } 1823 EXPORT_SYMBOL(p9_client_getattr_dotl); 1824 1825 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1826 { 1827 int ret; 1828 1829 /* NOTE: size shouldn't include its own length */ 1830 /* size[2] type[2] dev[4] qid[13] */ 1831 /* mode[4] atime[4] mtime[4] length[8]*/ 1832 /* name[s] uid[s] gid[s] muid[s] */ 1833 ret = 2 + 4 + 13 + 4 + 4 + 4 + 8 + 2 + 2 + 2 + 2; 1834 1835 if (wst->name) 1836 ret += strlen(wst->name); 1837 if (wst->uid) 1838 ret += strlen(wst->uid); 1839 if (wst->gid) 1840 ret += strlen(wst->gid); 1841 if (wst->muid) 1842 ret += strlen(wst->muid); 1843 1844 if (proto_version == p9_proto_2000u || 1845 proto_version == p9_proto_2000L) { 1846 /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1847 ret += 2 + 4 + 4 + 4; 1848 if (wst->extension) 1849 ret += strlen(wst->extension); 1850 } 1851 1852 return ret; 1853 } 1854 1855 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1856 { 1857 int err = 0; 1858 struct p9_req_t *req; 1859 struct p9_client *clnt; 1860 1861 clnt = fid->clnt; 1862 wst->size = p9_client_statsize(wst, clnt->proto_version); 1863 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", 1864 fid->fid); 1865 p9_debug(P9_DEBUG_9P, 1866 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1867 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1868 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1869 " uid=%d gid=%d n_muid=%d\n", 1870 wst->size, wst->type, wst->dev, wst->qid.type, 1871 wst->qid.path, wst->qid.version, 1872 wst->mode, wst->atime, wst->mtime, wst->length, 1873 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1874 from_kuid(&init_user_ns, wst->n_uid), 1875 from_kgid(&init_user_ns, wst->n_gid), 1876 from_kuid(&init_user_ns, wst->n_muid)); 1877 1878 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", 1879 fid->fid, wst->size + 2, wst); 1880 if (IS_ERR(req)) { 1881 err = PTR_ERR(req); 1882 goto error; 1883 } 1884 1885 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1886 1887 p9_req_put(clnt, req); 1888 error: 1889 return err; 1890 } 1891 EXPORT_SYMBOL(p9_client_wstat); 1892 1893 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1894 { 1895 int err = 0; 1896 struct p9_req_t *req; 1897 struct p9_client *clnt; 1898 1899 clnt = fid->clnt; 1900 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1901 p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n", 1902 p9attr->valid, p9attr->mode, 1903 from_kuid(&init_user_ns, p9attr->uid), 1904 from_kgid(&init_user_ns, p9attr->gid), 1905 p9attr->size); 1906 p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n", 1907 p9attr->atime_sec, p9attr->atime_nsec); 1908 p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n", 1909 p9attr->mtime_sec, p9attr->mtime_nsec); 1910 1911 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1912 1913 if (IS_ERR(req)) { 1914 err = PTR_ERR(req); 1915 goto error; 1916 } 1917 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1918 p9_req_put(clnt, req); 1919 error: 1920 return err; 1921 } 1922 EXPORT_SYMBOL(p9_client_setattr); 1923 1924 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1925 { 1926 int err; 1927 struct p9_req_t *req; 1928 struct p9_client *clnt; 1929 1930 clnt = fid->clnt; 1931 1932 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1933 1934 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1935 if (IS_ERR(req)) { 1936 err = PTR_ERR(req); 1937 goto error; 1938 } 1939 1940 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1941 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1942 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1943 if (err) { 1944 trace_9p_protocol_dump(clnt, &req->rc); 1945 p9_req_put(clnt, req); 1946 goto error; 1947 } 1948 1949 p9_debug(P9_DEBUG_9P, 1950 "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n", 1951 fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree, 1952 sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen); 1953 1954 p9_req_put(clnt, req); 1955 error: 1956 return err; 1957 } 1958 EXPORT_SYMBOL(p9_client_statfs); 1959 1960 int p9_client_rename(struct p9_fid *fid, 1961 struct p9_fid *newdirfid, const char *name) 1962 { 1963 int err = 0; 1964 struct p9_req_t *req; 1965 struct p9_client *clnt; 1966 1967 clnt = fid->clnt; 1968 1969 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1970 fid->fid, newdirfid->fid, name); 1971 1972 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1973 newdirfid->fid, name); 1974 if (IS_ERR(req)) { 1975 err = PTR_ERR(req); 1976 goto error; 1977 } 1978 1979 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1980 1981 p9_req_put(clnt, req); 1982 error: 1983 return err; 1984 } 1985 EXPORT_SYMBOL(p9_client_rename); 1986 1987 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1988 struct p9_fid *newdirfid, const char *new_name) 1989 { 1990 int err = 0; 1991 struct p9_req_t *req; 1992 struct p9_client *clnt; 1993 1994 clnt = olddirfid->clnt; 1995 1996 p9_debug(P9_DEBUG_9P, 1997 ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n", 1998 olddirfid->fid, old_name, newdirfid->fid, new_name); 1999 2000 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 2001 old_name, newdirfid->fid, new_name); 2002 if (IS_ERR(req)) { 2003 err = PTR_ERR(req); 2004 goto error; 2005 } 2006 2007 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 2008 newdirfid->fid, new_name); 2009 2010 p9_req_put(clnt, req); 2011 error: 2012 return err; 2013 } 2014 EXPORT_SYMBOL(p9_client_renameat); 2015 2016 /* An xattrwalk without @attr_name gives the fid for the lisxattr namespace 2017 */ 2018 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 2019 const char *attr_name, u64 *attr_size) 2020 { 2021 int err; 2022 struct p9_req_t *req; 2023 struct p9_client *clnt; 2024 struct p9_fid *attr_fid; 2025 2026 clnt = file_fid->clnt; 2027 attr_fid = p9_fid_create(clnt); 2028 if (!attr_fid) { 2029 err = -ENOMEM; 2030 goto error; 2031 } 2032 p9_debug(P9_DEBUG_9P, 2033 ">>> TXATTRWALK file_fid %d, attr_fid %d name '%s'\n", 2034 file_fid->fid, attr_fid->fid, attr_name); 2035 2036 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 2037 file_fid->fid, attr_fid->fid, attr_name); 2038 if (IS_ERR(req)) { 2039 err = PTR_ERR(req); 2040 goto error; 2041 } 2042 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); 2043 if (err) { 2044 trace_9p_protocol_dump(clnt, &req->rc); 2045 p9_req_put(clnt, req); 2046 goto clunk_fid; 2047 } 2048 p9_req_put(clnt, req); 2049 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2050 attr_fid->fid, *attr_size); 2051 return attr_fid; 2052 clunk_fid: 2053 p9_fid_put(attr_fid); 2054 attr_fid = NULL; 2055 error: 2056 if (attr_fid && attr_fid != file_fid) 2057 p9_fid_destroy(attr_fid); 2058 2059 return ERR_PTR(err); 2060 } 2061 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2062 2063 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2064 u64 attr_size, int flags) 2065 { 2066 int err = 0; 2067 struct p9_req_t *req; 2068 struct p9_client *clnt; 2069 2070 p9_debug(P9_DEBUG_9P, 2071 ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n", 2072 fid->fid, name, attr_size, flags); 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, ITER_DEST, &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 clnt = fid->clnt; 2102 2103 rsize = fid->iounit; 2104 if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ) 2105 rsize = clnt->msize - P9_READDIRHDRSZ; 2106 2107 if (count < rsize) 2108 rsize = count; 2109 2110 /* Don't bother zerocopy for small IO (< 1024) */ 2111 if (clnt->trans_mod->zc_request && rsize > 1024) { 2112 /* response header len is 11 2113 * PDU Header(7) + IO Size (4) 2114 */ 2115 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2116 11, "dqd", fid->fid, offset, rsize); 2117 } else { 2118 non_zc = 1; 2119 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2120 offset, rsize); 2121 } 2122 if (IS_ERR(req)) { 2123 err = PTR_ERR(req); 2124 goto error; 2125 } 2126 2127 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); 2128 if (err) { 2129 trace_9p_protocol_dump(clnt, &req->rc); 2130 goto free_and_error; 2131 } 2132 if (rsize < count) { 2133 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2134 count = rsize; 2135 } 2136 2137 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2138 2139 if (non_zc) 2140 memmove(data, dataptr, count); 2141 2142 p9_req_put(clnt, req); 2143 return count; 2144 2145 free_and_error: 2146 p9_req_put(clnt, req); 2147 error: 2148 return err; 2149 } 2150 EXPORT_SYMBOL(p9_client_readdir); 2151 2152 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2153 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2154 { 2155 int err; 2156 struct p9_client *clnt; 2157 struct p9_req_t *req; 2158 2159 clnt = fid->clnt; 2160 p9_debug(P9_DEBUG_9P, 2161 ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n", 2162 fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2163 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2164 MAJOR(rdev), MINOR(rdev), gid); 2165 if (IS_ERR(req)) 2166 return PTR_ERR(req); 2167 2168 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2169 if (err) { 2170 trace_9p_protocol_dump(clnt, &req->rc); 2171 goto error; 2172 } 2173 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", 2174 qid->type, qid->path, qid->version); 2175 2176 error: 2177 p9_req_put(clnt, req); 2178 return err; 2179 } 2180 EXPORT_SYMBOL(p9_client_mknod_dotl); 2181 2182 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2183 kgid_t gid, struct p9_qid *qid) 2184 { 2185 int err; 2186 struct p9_client *clnt; 2187 struct p9_req_t *req; 2188 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 clnt = fid->clnt; 2218 p9_debug(P9_DEBUG_9P, 2219 ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n", 2220 fid->fid, flock->type, flock->flags, flock->start, 2221 flock->length, flock->proc_id, flock->client_id); 2222 2223 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2224 flock->flags, flock->start, flock->length, 2225 flock->proc_id, flock->client_id); 2226 2227 if (IS_ERR(req)) 2228 return PTR_ERR(req); 2229 2230 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); 2231 if (err) { 2232 trace_9p_protocol_dump(clnt, &req->rc); 2233 goto error; 2234 } 2235 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2236 error: 2237 p9_req_put(clnt, req); 2238 return err; 2239 } 2240 EXPORT_SYMBOL(p9_client_lock_dotl); 2241 2242 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2243 { 2244 int err; 2245 struct p9_client *clnt; 2246 struct p9_req_t *req; 2247 2248 clnt = fid->clnt; 2249 p9_debug(P9_DEBUG_9P, 2250 ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n", 2251 fid->fid, glock->type, glock->start, glock->length, 2252 glock->proc_id, glock->client_id); 2253 2254 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, 2255 glock->type, glock->start, glock->length, 2256 glock->proc_id, glock->client_id); 2257 2258 if (IS_ERR(req)) 2259 return PTR_ERR(req); 2260 2261 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, 2262 &glock->start, &glock->length, &glock->proc_id, 2263 &glock->client_id); 2264 if (err) { 2265 trace_9p_protocol_dump(clnt, &req->rc); 2266 goto error; 2267 } 2268 p9_debug(P9_DEBUG_9P, 2269 "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n", 2270 glock->type, glock->start, glock->length, 2271 glock->proc_id, glock->client_id); 2272 error: 2273 p9_req_put(clnt, req); 2274 return err; 2275 } 2276 EXPORT_SYMBOL(p9_client_getlock_dotl); 2277 2278 int p9_client_readlink(struct p9_fid *fid, char **target) 2279 { 2280 int err; 2281 struct p9_client *clnt; 2282 struct p9_req_t *req; 2283 2284 clnt = fid->clnt; 2285 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2286 2287 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2288 if (IS_ERR(req)) 2289 return PTR_ERR(req); 2290 2291 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); 2292 if (err) { 2293 trace_9p_protocol_dump(clnt, &req->rc); 2294 goto error; 2295 } 2296 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2297 error: 2298 p9_req_put(clnt, req); 2299 return err; 2300 } 2301 EXPORT_SYMBOL(p9_client_readlink); 2302 2303 int __init p9_client_init(void) 2304 { 2305 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); 2306 return p9_req_cache ? 0 : -ENOMEM; 2307 } 2308 2309 void __exit p9_client_exit(void) 2310 { 2311 kmem_cache_destroy(p9_req_cache); 2312 } 2313