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 if (!fc->sdata && c->trans_mod->supports_vmalloc) { 233 fc->sdata = kvmalloc(alloc_msize, GFP_NOFS); 234 fc->cache = NULL; 235 } 236 } else { 237 if (c->trans_mod->supports_vmalloc) 238 fc->sdata = kvmalloc(alloc_msize, GFP_NOFS); 239 else 240 fc->sdata = kmalloc(alloc_msize, GFP_NOFS); 241 fc->cache = NULL; 242 } 243 if (!fc->sdata) 244 return -ENOMEM; 245 fc->capacity = alloc_msize; 246 fc->id = 0; 247 fc->tag = P9_NOTAG; 248 return 0; 249 } 250 251 void p9_fcall_fini(struct p9_fcall *fc) 252 { 253 /* sdata can be NULL for interrupted requests in trans_rdma, 254 * and kmem_cache_free does not do NULL-check for us 255 */ 256 if (unlikely(!fc->sdata)) 257 return; 258 259 if (fc->cache) 260 kmem_cache_free(fc->cache, fc->sdata); 261 else 262 kvfree(fc->sdata); 263 } 264 EXPORT_SYMBOL(p9_fcall_fini); 265 266 static struct kmem_cache *p9_req_cache; 267 268 /** 269 * p9_tag_alloc - Allocate a new request. 270 * @c: Client session. 271 * @type: Transaction type. 272 * @t_size: Buffer size for holding this request 273 * (automatic calculation by format template if 0). 274 * @r_size: Buffer size for holding server's reply on this request 275 * (automatic calculation by format template if 0). 276 * @fmt: Format template for assembling 9p request message 277 * (see p9pdu_vwritef). 278 * @ap: Variable arguments to be fed to passed format template 279 * (see p9pdu_vwritef). 280 * 281 * Context: Process context. 282 * Return: Pointer to new request. 283 */ 284 static struct p9_req_t * 285 p9_tag_alloc(struct p9_client *c, int8_t type, uint t_size, uint r_size, 286 const char *fmt, va_list ap) 287 { 288 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); 289 int alloc_tsize; 290 int alloc_rsize; 291 int tag; 292 va_list apc; 293 294 va_copy(apc, ap); 295 alloc_tsize = min_t(size_t, c->msize, 296 t_size ?: p9_msg_buf_size(c, type, fmt, apc)); 297 va_end(apc); 298 299 alloc_rsize = min_t(size_t, c->msize, 300 r_size ?: p9_msg_buf_size(c, type + 1, fmt, ap)); 301 302 if (!req) 303 return ERR_PTR(-ENOMEM); 304 305 if (p9_fcall_init(c, &req->tc, alloc_tsize)) 306 goto free_req; 307 if (p9_fcall_init(c, &req->rc, alloc_rsize)) 308 goto free; 309 310 p9pdu_reset(&req->tc); 311 p9pdu_reset(&req->rc); 312 req->t_err = 0; 313 req->status = REQ_STATUS_ALLOC; 314 /* refcount needs to be set to 0 before inserting into the idr 315 * so p9_tag_lookup does not accept a request that is not fully 316 * initialized. refcount_set to 2 below will mark request ready. 317 */ 318 refcount_set(&req->refcount, 0); 319 init_waitqueue_head(&req->wq); 320 INIT_LIST_HEAD(&req->req_list); 321 322 idr_preload(GFP_NOFS); 323 spin_lock_irq(&c->lock); 324 if (type == P9_TVERSION) 325 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1, 326 GFP_NOWAIT); 327 else 328 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT); 329 req->tc.tag = tag; 330 spin_unlock_irq(&c->lock); 331 idr_preload_end(); 332 if (tag < 0) 333 goto free; 334 335 /* Init ref to two because in the general case there is one ref 336 * that is put asynchronously by a writer thread, one ref 337 * temporarily given by p9_tag_lookup and put by p9_client_cb 338 * in the recv thread, and one ref put by p9_req_put in the 339 * main thread. The only exception is virtio that does not use 340 * p9_tag_lookup but does not have a writer thread either 341 * (the write happens synchronously in the request/zc_request 342 * callback), so p9_client_cb eats the second ref there 343 * as the pointer is duplicated directly by virtqueue_add_sgs() 344 */ 345 refcount_set(&req->refcount, 2); 346 347 return req; 348 349 free: 350 p9_fcall_fini(&req->tc); 351 p9_fcall_fini(&req->rc); 352 free_req: 353 kmem_cache_free(p9_req_cache, req); 354 return ERR_PTR(-ENOMEM); 355 } 356 357 /** 358 * p9_tag_lookup - Look up a request by tag. 359 * @c: Client session. 360 * @tag: Transaction ID. 361 * 362 * Context: Any context. 363 * Return: A request, or %NULL if there is no request with that tag. 364 */ 365 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 366 { 367 struct p9_req_t *req; 368 369 rcu_read_lock(); 370 again: 371 req = idr_find(&c->reqs, tag); 372 if (req) { 373 /* We have to be careful with the req found under rcu_read_lock 374 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the 375 * ref again without corrupting other data, then check again 376 * that the tag matches once we have the ref 377 */ 378 if (!p9_req_try_get(req)) 379 goto again; 380 if (req->tc.tag != tag) { 381 p9_req_put(c, req); 382 goto again; 383 } 384 } 385 rcu_read_unlock(); 386 387 return req; 388 } 389 EXPORT_SYMBOL(p9_tag_lookup); 390 391 /** 392 * p9_tag_remove - Remove a tag. 393 * @c: Client session. 394 * @r: Request of reference. 395 * 396 * Context: Any context. 397 */ 398 static void p9_tag_remove(struct p9_client *c, struct p9_req_t *r) 399 { 400 unsigned long flags; 401 u16 tag = r->tc.tag; 402 403 p9_debug(P9_DEBUG_MUX, "freeing clnt %p req %p tag: %d\n", c, r, tag); 404 spin_lock_irqsave(&c->lock, flags); 405 idr_remove(&c->reqs, tag); 406 spin_unlock_irqrestore(&c->lock, flags); 407 } 408 409 int p9_req_put(struct p9_client *c, struct p9_req_t *r) 410 { 411 if (refcount_dec_and_test(&r->refcount)) { 412 p9_tag_remove(c, r); 413 414 p9_fcall_fini(&r->tc); 415 p9_fcall_fini(&r->rc); 416 kmem_cache_free(p9_req_cache, r); 417 return 1; 418 } 419 return 0; 420 } 421 EXPORT_SYMBOL(p9_req_put); 422 423 /** 424 * p9_tag_cleanup - cleans up tags structure and reclaims resources 425 * @c: v9fs client struct 426 * 427 * This frees resources associated with the tags structure 428 * 429 */ 430 static void p9_tag_cleanup(struct p9_client *c) 431 { 432 struct p9_req_t *req; 433 int id; 434 435 rcu_read_lock(); 436 idr_for_each_entry(&c->reqs, req, id) { 437 pr_info("Tag %d still in use\n", id); 438 if (p9_req_put(c, req) == 0) 439 pr_warn("Packet with tag %d has still references", 440 req->tc.tag); 441 } 442 rcu_read_unlock(); 443 } 444 445 /** 446 * p9_client_cb - call back from transport to client 447 * @c: client state 448 * @req: request received 449 * @status: request status, one of REQ_STATUS_* 450 * 451 */ 452 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) 453 { 454 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); 455 456 /* This barrier is needed to make sure any change made to req before 457 * the status change is visible to another thread 458 */ 459 smp_wmb(); 460 WRITE_ONCE(req->status, status); 461 462 wake_up(&req->wq); 463 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); 464 p9_req_put(c, req); 465 } 466 EXPORT_SYMBOL(p9_client_cb); 467 468 /** 469 * p9_parse_header - parse header arguments out of a packet 470 * @pdu: packet to parse 471 * @size: size of packet 472 * @type: type of request 473 * @tag: tag of packet 474 * @rewind: set if we need to rewind offset afterwards 475 */ 476 477 int 478 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, 479 int16_t *tag, int rewind) 480 { 481 s8 r_type; 482 s16 r_tag; 483 s32 r_size; 484 int offset = pdu->offset; 485 int err; 486 487 pdu->offset = 0; 488 489 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 490 if (err) 491 goto rewind_and_exit; 492 493 if (type) 494 *type = r_type; 495 if (tag) 496 *tag = r_tag; 497 if (size) 498 *size = r_size; 499 500 if (pdu->size != r_size || r_size < 7) { 501 err = -EINVAL; 502 goto rewind_and_exit; 503 } 504 505 pdu->id = r_type; 506 pdu->tag = r_tag; 507 508 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 509 pdu->size, pdu->id, pdu->tag); 510 511 rewind_and_exit: 512 if (rewind) 513 pdu->offset = offset; 514 return err; 515 } 516 EXPORT_SYMBOL(p9_parse_header); 517 518 /** 519 * p9_check_errors - check 9p packet for error return and process it 520 * @c: current client instance 521 * @req: request to parse and check for error conditions 522 * 523 * returns error code if one is discovered, otherwise returns 0 524 * 525 * this will have to be more complicated if we have multiple 526 * error packet types 527 */ 528 529 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 530 { 531 s8 type; 532 int err; 533 int ecode; 534 535 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 536 if (req->rc.size > req->rc.capacity && !req->rc.zc) { 537 pr_err("requested packet size too big: %d does not fit %zu (type=%d)\n", 538 req->rc.size, req->rc.capacity, req->rc.id); 539 return -EIO; 540 } 541 /* dump the response from server 542 * This should be after check errors which poplulate pdu_fcall. 543 */ 544 trace_9p_protocol_dump(c, &req->rc); 545 if (err) { 546 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 547 return err; 548 } 549 if (type != P9_RERROR && type != P9_RLERROR) 550 return 0; 551 552 if (!p9_is_proto_dotl(c)) { 553 char *ename = NULL; 554 555 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 556 &ename, &ecode); 557 if (err) { 558 kfree(ename); 559 goto out_err; 560 } 561 562 if (p9_is_proto_dotu(c) && ecode < 512) 563 err = -ecode; 564 565 if (!err) { 566 err = p9_errstr2errno(ename, strlen(ename)); 567 568 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 569 -ecode, ename); 570 } 571 kfree(ename); 572 } else { 573 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 574 if (err) 575 goto out_err; 576 err = -ecode; 577 578 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 579 } 580 581 return err; 582 583 out_err: 584 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 585 586 return err; 587 } 588 589 static struct p9_req_t * 590 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 591 592 /** 593 * p9_client_flush - flush (cancel) a request 594 * @c: client state 595 * @oldreq: request to cancel 596 * 597 * This sents a flush for a particular request and links 598 * the flush request to the original request. The current 599 * code only supports a single flush request although the protocol 600 * allows for multiple flush requests to be sent for a single request. 601 * 602 */ 603 604 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 605 { 606 struct p9_req_t *req; 607 s16 oldtag; 608 int err; 609 610 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); 611 if (err) 612 return err; 613 614 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 615 616 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 617 if (IS_ERR(req)) 618 return PTR_ERR(req); 619 620 /* if we haven't received a response for oldreq, 621 * remove it from the list 622 */ 623 if (READ_ONCE(oldreq->status) == REQ_STATUS_SENT) { 624 if (c->trans_mod->cancelled) 625 c->trans_mod->cancelled(c, oldreq); 626 } 627 628 p9_req_put(c, req); 629 return 0; 630 } 631 632 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 633 int8_t type, uint t_size, uint r_size, 634 const char *fmt, va_list ap) 635 { 636 int err; 637 struct p9_req_t *req; 638 va_list apc; 639 640 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 641 642 /* we allow for any status other than disconnected */ 643 if (c->status == Disconnected) 644 return ERR_PTR(-EIO); 645 646 /* if status is begin_disconnected we allow only clunk request */ 647 if (c->status == BeginDisconnect && type != P9_TCLUNK) 648 return ERR_PTR(-EIO); 649 650 va_copy(apc, ap); 651 req = p9_tag_alloc(c, type, t_size, r_size, fmt, apc); 652 va_end(apc); 653 if (IS_ERR(req)) 654 return req; 655 656 /* marshall the data */ 657 p9pdu_prepare(&req->tc, req->tc.tag, type); 658 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); 659 if (err) 660 goto reterr; 661 p9pdu_finalize(c, &req->tc); 662 trace_9p_client_req(c, type, req->tc.tag); 663 return req; 664 reterr: 665 p9_req_put(c, req); 666 /* We have to put also the 2nd reference as it won't be used */ 667 p9_req_put(c, req); 668 return ERR_PTR(err); 669 } 670 671 /** 672 * p9_client_rpc - issue a request and wait for a response 673 * @c: client session 674 * @type: type of request 675 * @fmt: protocol format string (see protocol.c) 676 * 677 * Returns request structure (which client must free using p9_req_put) 678 */ 679 680 static struct p9_req_t * 681 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 682 { 683 va_list ap; 684 int sigpending, err; 685 unsigned long flags; 686 struct p9_req_t *req; 687 /* Passing zero for tsize/rsize to p9_client_prepare_req() tells it to 688 * auto determine an appropriate (small) request/response size 689 * according to actual message data being sent. Currently RDMA 690 * transport is excluded from this response message size optimization, 691 * as it would not cope with it, due to its pooled response buffers 692 * (using an optimized request size for RDMA as well though). 693 */ 694 const uint tsize = 0; 695 const uint rsize = c->trans_mod->pooled_rbuffers ? c->msize : 0; 696 697 va_start(ap, fmt); 698 req = p9_client_prepare_req(c, type, tsize, rsize, fmt, ap); 699 va_end(ap); 700 if (IS_ERR(req)) 701 return req; 702 703 req->tc.zc = false; 704 req->rc.zc = false; 705 706 if (signal_pending(current)) { 707 sigpending = 1; 708 clear_thread_flag(TIF_SIGPENDING); 709 } else { 710 sigpending = 0; 711 } 712 713 err = c->trans_mod->request(c, req); 714 if (err < 0) { 715 /* write won't happen */ 716 p9_req_put(c, req); 717 if (err != -ERESTARTSYS && err != -EFAULT) 718 c->status = Disconnected; 719 goto recalc_sigpending; 720 } 721 again: 722 /* Wait for the response */ 723 err = wait_event_killable(req->wq, 724 READ_ONCE(req->status) >= REQ_STATUS_RCVD); 725 726 /* Make sure our req is coherent with regard to updates in other 727 * threads - echoes to wmb() in the callback 728 */ 729 smp_rmb(); 730 731 if (err == -ERESTARTSYS && c->status == Connected && 732 type == P9_TFLUSH) { 733 sigpending = 1; 734 clear_thread_flag(TIF_SIGPENDING); 735 goto again; 736 } 737 738 if (READ_ONCE(req->status) == REQ_STATUS_ERROR) { 739 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 740 err = req->t_err; 741 } 742 if (err == -ERESTARTSYS && c->status == Connected) { 743 p9_debug(P9_DEBUG_MUX, "flushing\n"); 744 sigpending = 1; 745 clear_thread_flag(TIF_SIGPENDING); 746 747 if (c->trans_mod->cancel(c, req)) 748 p9_client_flush(c, req); 749 750 /* if we received the response anyway, don't signal error */ 751 if (READ_ONCE(req->status) == REQ_STATUS_RCVD) 752 err = 0; 753 } 754 recalc_sigpending: 755 if (sigpending) { 756 spin_lock_irqsave(¤t->sighand->siglock, flags); 757 recalc_sigpending(); 758 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 759 } 760 if (err < 0) 761 goto reterr; 762 763 err = p9_check_errors(c, req); 764 trace_9p_client_res(c, type, req->rc.tag, err); 765 if (!err) 766 return req; 767 reterr: 768 p9_req_put(c, req); 769 return ERR_PTR(safe_errno(err)); 770 } 771 772 /** 773 * p9_client_zc_rpc - issue a request and wait for a response 774 * @c: client session 775 * @type: type of request 776 * @uidata: destination for zero copy read 777 * @uodata: source for zero copy write 778 * @inlen: read buffer size 779 * @olen: write buffer size 780 * @in_hdrlen: reader header size, This is the size of response protocol data 781 * @fmt: protocol format string (see protocol.c) 782 * 783 * Returns request structure (which client must free using p9_req_put) 784 */ 785 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 786 struct iov_iter *uidata, 787 struct iov_iter *uodata, 788 int inlen, int olen, int in_hdrlen, 789 const char *fmt, ...) 790 { 791 va_list ap; 792 int sigpending, err; 793 unsigned long flags; 794 struct p9_req_t *req; 795 796 va_start(ap, fmt); 797 /* We allocate a inline protocol data of only 4k bytes. 798 * The actual content is passed in zero-copy fashion. 799 */ 800 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, P9_ZC_HDR_SZ, fmt, ap); 801 va_end(ap); 802 if (IS_ERR(req)) 803 return req; 804 805 req->tc.zc = true; 806 req->rc.zc = true; 807 808 if (signal_pending(current)) { 809 sigpending = 1; 810 clear_thread_flag(TIF_SIGPENDING); 811 } else { 812 sigpending = 0; 813 } 814 815 err = c->trans_mod->zc_request(c, req, uidata, uodata, 816 inlen, olen, in_hdrlen); 817 if (err < 0) { 818 if (err == -EIO) 819 c->status = Disconnected; 820 if (err != -ERESTARTSYS) 821 goto recalc_sigpending; 822 } 823 if (READ_ONCE(req->status) == REQ_STATUS_ERROR) { 824 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 825 err = req->t_err; 826 } 827 if (err == -ERESTARTSYS && c->status == Connected) { 828 p9_debug(P9_DEBUG_MUX, "flushing\n"); 829 sigpending = 1; 830 clear_thread_flag(TIF_SIGPENDING); 831 832 if (c->trans_mod->cancel(c, req)) 833 p9_client_flush(c, req); 834 835 /* if we received the response anyway, don't signal error */ 836 if (READ_ONCE(req->status) == REQ_STATUS_RCVD) 837 err = 0; 838 } 839 recalc_sigpending: 840 if (sigpending) { 841 spin_lock_irqsave(¤t->sighand->siglock, flags); 842 recalc_sigpending(); 843 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 844 } 845 if (err < 0) 846 goto reterr; 847 848 err = p9_check_errors(c, req); 849 trace_9p_client_res(c, type, req->rc.tag, err); 850 if (!err) 851 return req; 852 reterr: 853 p9_req_put(c, req); 854 return ERR_PTR(safe_errno(err)); 855 } 856 857 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 858 { 859 int ret; 860 struct p9_fid *fid; 861 862 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 863 fid = kzalloc(sizeof(*fid), GFP_KERNEL); 864 if (!fid) 865 return NULL; 866 867 fid->mode = -1; 868 fid->uid = current_fsuid(); 869 fid->clnt = clnt; 870 refcount_set(&fid->count, 1); 871 872 idr_preload(GFP_KERNEL); 873 spin_lock_irq(&clnt->lock); 874 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, 875 GFP_NOWAIT); 876 spin_unlock_irq(&clnt->lock); 877 idr_preload_end(); 878 if (!ret) { 879 trace_9p_fid_ref(fid, P9_FID_REF_CREATE); 880 return fid; 881 } 882 883 kfree(fid); 884 return NULL; 885 } 886 887 static void p9_fid_destroy(struct p9_fid *fid) 888 { 889 struct p9_client *clnt; 890 unsigned long flags; 891 892 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 893 trace_9p_fid_ref(fid, P9_FID_REF_DESTROY); 894 clnt = fid->clnt; 895 spin_lock_irqsave(&clnt->lock, flags); 896 idr_remove(&clnt->fids, fid->fid); 897 spin_unlock_irqrestore(&clnt->lock, flags); 898 kfree(fid->rdir); 899 kfree(fid); 900 } 901 902 /* We also need to export tracepoint symbols for tracepoint_enabled() */ 903 EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref); 904 905 void do_trace_9p_fid_get(struct p9_fid *fid) 906 { 907 trace_9p_fid_ref(fid, P9_FID_REF_GET); 908 } 909 EXPORT_SYMBOL(do_trace_9p_fid_get); 910 911 void do_trace_9p_fid_put(struct p9_fid *fid) 912 { 913 trace_9p_fid_ref(fid, P9_FID_REF_PUT); 914 } 915 EXPORT_SYMBOL(do_trace_9p_fid_put); 916 917 static int p9_client_version(struct p9_client *c) 918 { 919 int err; 920 struct p9_req_t *req; 921 char *version = NULL; 922 int msize; 923 924 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 925 c->msize, c->proto_version); 926 927 switch (c->proto_version) { 928 case p9_proto_2000L: 929 req = p9_client_rpc(c, P9_TVERSION, "ds", 930 c->msize, "9P2000.L"); 931 break; 932 case p9_proto_2000u: 933 req = p9_client_rpc(c, P9_TVERSION, "ds", 934 c->msize, "9P2000.u"); 935 break; 936 case p9_proto_legacy: 937 req = p9_client_rpc(c, P9_TVERSION, "ds", 938 c->msize, "9P2000"); 939 break; 940 default: 941 return -EINVAL; 942 } 943 944 if (IS_ERR(req)) 945 return PTR_ERR(req); 946 947 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); 948 if (err) { 949 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 950 trace_9p_protocol_dump(c, &req->rc); 951 goto error; 952 } 953 954 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 955 if (!strncmp(version, "9P2000.L", 8)) { 956 c->proto_version = p9_proto_2000L; 957 } else if (!strncmp(version, "9P2000.u", 8)) { 958 c->proto_version = p9_proto_2000u; 959 } else if (!strncmp(version, "9P2000", 6)) { 960 c->proto_version = p9_proto_legacy; 961 } else { 962 p9_debug(P9_DEBUG_ERROR, 963 "server returned an unknown version: %s\n", version); 964 err = -EREMOTEIO; 965 goto error; 966 } 967 968 if (msize < 4096) { 969 p9_debug(P9_DEBUG_ERROR, 970 "server returned a msize < 4096: %d\n", msize); 971 err = -EREMOTEIO; 972 goto error; 973 } 974 if (msize < c->msize) 975 c->msize = msize; 976 977 error: 978 kfree(version); 979 p9_req_put(c, req); 980 981 return err; 982 } 983 984 struct p9_client *p9_client_create(const char *dev_name, char *options) 985 { 986 int err; 987 static atomic_t seqno = ATOMIC_INIT(0); 988 struct p9_client *clnt; 989 char *client_id; 990 char *cache_name; 991 992 clnt = kmalloc(sizeof(*clnt), GFP_KERNEL); 993 if (!clnt) 994 return ERR_PTR(-ENOMEM); 995 996 clnt->trans_mod = NULL; 997 clnt->trans = NULL; 998 clnt->fcall_cache = NULL; 999 1000 client_id = utsname()->nodename; 1001 memcpy(clnt->name, client_id, strlen(client_id) + 1); 1002 1003 spin_lock_init(&clnt->lock); 1004 idr_init(&clnt->fids); 1005 idr_init(&clnt->reqs); 1006 1007 err = parse_opts(options, clnt); 1008 if (err < 0) 1009 goto free_client; 1010 1011 if (!clnt->trans_mod) 1012 clnt->trans_mod = v9fs_get_default_trans(); 1013 1014 if (!clnt->trans_mod) { 1015 err = -EPROTONOSUPPORT; 1016 p9_debug(P9_DEBUG_ERROR, 1017 "No transport defined or default transport\n"); 1018 goto free_client; 1019 } 1020 1021 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1022 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1023 1024 err = clnt->trans_mod->create(clnt, dev_name, options); 1025 if (err) 1026 goto put_trans; 1027 1028 if (clnt->msize > clnt->trans_mod->maxsize) { 1029 clnt->msize = clnt->trans_mod->maxsize; 1030 pr_info("Limiting 'msize' to %d as this is the maximum " 1031 "supported by transport %s\n", 1032 clnt->msize, clnt->trans_mod->name 1033 ); 1034 } 1035 1036 if (clnt->msize < 4096) { 1037 p9_debug(P9_DEBUG_ERROR, 1038 "Please specify a msize of at least 4k\n"); 1039 err = -EINVAL; 1040 goto close_trans; 1041 } 1042 1043 err = p9_client_version(clnt); 1044 if (err) 1045 goto close_trans; 1046 1047 cache_name = kasprintf(GFP_KERNEL, 1048 "9p-fcall-cache-%u", atomic_inc_return(&seqno)); 1049 if (!cache_name) { 1050 err = -ENOMEM; 1051 goto close_trans; 1052 } 1053 1054 /* P9_HDRSZ + 4 is the smallest packet header we can have that is 1055 * followed by data accessed from userspace by read 1056 */ 1057 clnt->fcall_cache = 1058 kmem_cache_create_usercopy(cache_name, clnt->msize, 1059 0, 0, P9_HDRSZ + 4, 1060 clnt->msize - (P9_HDRSZ + 4), 1061 NULL); 1062 1063 kfree(cache_name); 1064 return clnt; 1065 1066 close_trans: 1067 clnt->trans_mod->close(clnt); 1068 put_trans: 1069 v9fs_put_trans(clnt->trans_mod); 1070 free_client: 1071 kfree(clnt); 1072 return ERR_PTR(err); 1073 } 1074 EXPORT_SYMBOL(p9_client_create); 1075 1076 void p9_client_destroy(struct p9_client *clnt) 1077 { 1078 struct p9_fid *fid; 1079 int id; 1080 1081 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1082 1083 if (clnt->trans_mod) 1084 clnt->trans_mod->close(clnt); 1085 1086 v9fs_put_trans(clnt->trans_mod); 1087 1088 idr_for_each_entry(&clnt->fids, fid, id) { 1089 pr_info("Found fid %d not clunked\n", fid->fid); 1090 p9_fid_destroy(fid); 1091 } 1092 1093 p9_tag_cleanup(clnt); 1094 1095 kmem_cache_destroy(clnt->fcall_cache); 1096 kfree(clnt); 1097 } 1098 EXPORT_SYMBOL(p9_client_destroy); 1099 1100 void p9_client_disconnect(struct p9_client *clnt) 1101 { 1102 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1103 clnt->status = Disconnected; 1104 } 1105 EXPORT_SYMBOL(p9_client_disconnect); 1106 1107 void p9_client_begin_disconnect(struct p9_client *clnt) 1108 { 1109 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1110 clnt->status = BeginDisconnect; 1111 } 1112 EXPORT_SYMBOL(p9_client_begin_disconnect); 1113 1114 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1115 const char *uname, kuid_t n_uname, 1116 const char *aname) 1117 { 1118 int err; 1119 struct p9_req_t *req; 1120 struct p9_fid *fid; 1121 struct p9_qid qid; 1122 1123 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1124 afid ? afid->fid : -1, uname, aname); 1125 fid = p9_fid_create(clnt); 1126 if (!fid) { 1127 err = -ENOMEM; 1128 goto error; 1129 } 1130 fid->uid = n_uname; 1131 1132 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1133 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1134 if (IS_ERR(req)) { 1135 err = PTR_ERR(req); 1136 goto error; 1137 } 1138 1139 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); 1140 if (err) { 1141 trace_9p_protocol_dump(clnt, &req->rc); 1142 p9_req_put(clnt, req); 1143 goto error; 1144 } 1145 1146 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1147 qid.type, qid.path, qid.version); 1148 1149 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1150 1151 p9_req_put(clnt, req); 1152 return fid; 1153 1154 error: 1155 if (fid) 1156 p9_fid_destroy(fid); 1157 return ERR_PTR(err); 1158 } 1159 EXPORT_SYMBOL(p9_client_attach); 1160 1161 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1162 const unsigned char * const *wnames, int clone) 1163 { 1164 int err; 1165 struct p9_client *clnt; 1166 struct p9_fid *fid; 1167 struct p9_qid *wqids; 1168 struct p9_req_t *req; 1169 u16 nwqids, count; 1170 1171 wqids = NULL; 1172 clnt = oldfid->clnt; 1173 if (clone) { 1174 fid = p9_fid_create(clnt); 1175 if (!fid) { 1176 err = -ENOMEM; 1177 goto error; 1178 } 1179 1180 fid->uid = oldfid->uid; 1181 } else { 1182 fid = oldfid; 1183 } 1184 1185 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1186 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1187 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1188 nwname, wnames); 1189 if (IS_ERR(req)) { 1190 err = PTR_ERR(req); 1191 goto error; 1192 } 1193 1194 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1195 if (err) { 1196 trace_9p_protocol_dump(clnt, &req->rc); 1197 p9_req_put(clnt, req); 1198 goto clunk_fid; 1199 } 1200 p9_req_put(clnt, req); 1201 1202 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1203 1204 if (nwqids != nwname) { 1205 err = -ENOENT; 1206 goto clunk_fid; 1207 } 1208 1209 for (count = 0; count < nwqids; count++) 1210 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1211 count, wqids[count].type, 1212 wqids[count].path, 1213 wqids[count].version); 1214 1215 if (nwname) 1216 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1217 else 1218 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); 1219 1220 kfree(wqids); 1221 return fid; 1222 1223 clunk_fid: 1224 kfree(wqids); 1225 p9_fid_put(fid); 1226 fid = NULL; 1227 1228 error: 1229 if (fid && fid != oldfid) 1230 p9_fid_destroy(fid); 1231 1232 return ERR_PTR(err); 1233 } 1234 EXPORT_SYMBOL(p9_client_walk); 1235 1236 int p9_client_open(struct p9_fid *fid, int mode) 1237 { 1238 int err; 1239 struct p9_client *clnt; 1240 struct p9_req_t *req; 1241 struct p9_qid qid; 1242 int iounit; 1243 1244 clnt = fid->clnt; 1245 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1246 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1247 1248 if (fid->mode != -1) 1249 return -EINVAL; 1250 1251 if (p9_is_proto_dotl(clnt)) 1252 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode & P9L_MODE_MASK); 1253 else 1254 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode & P9L_MODE_MASK); 1255 if (IS_ERR(req)) { 1256 err = PTR_ERR(req); 1257 goto error; 1258 } 1259 1260 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1261 if (err) { 1262 trace_9p_protocol_dump(clnt, &req->rc); 1263 goto free_and_error; 1264 } 1265 1266 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1267 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1268 qid.path, qid.version, iounit); 1269 1270 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1271 fid->mode = mode; 1272 fid->iounit = iounit; 1273 1274 free_and_error: 1275 p9_req_put(clnt, req); 1276 error: 1277 return err; 1278 } 1279 EXPORT_SYMBOL(p9_client_open); 1280 1281 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, 1282 u32 mode, kgid_t gid, struct p9_qid *qid) 1283 { 1284 int err; 1285 struct p9_client *clnt; 1286 struct p9_req_t *req; 1287 int iounit; 1288 1289 p9_debug(P9_DEBUG_9P, 1290 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1291 ofid->fid, name, flags, mode, 1292 from_kgid(&init_user_ns, gid)); 1293 clnt = ofid->clnt; 1294 1295 if (ofid->mode != -1) 1296 return -EINVAL; 1297 1298 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1299 mode & P9L_MODE_MASK, gid); 1300 if (IS_ERR(req)) { 1301 err = PTR_ERR(req); 1302 goto error; 1303 } 1304 1305 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); 1306 if (err) { 1307 trace_9p_protocol_dump(clnt, &req->rc); 1308 goto free_and_error; 1309 } 1310 1311 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1312 qid->type, qid->path, qid->version, iounit); 1313 1314 memmove(&ofid->qid, qid, sizeof(struct p9_qid)); 1315 ofid->mode = flags; 1316 ofid->iounit = iounit; 1317 1318 free_and_error: 1319 p9_req_put(clnt, req); 1320 error: 1321 return err; 1322 } 1323 EXPORT_SYMBOL(p9_client_create_dotl); 1324 1325 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1326 char *extension) 1327 { 1328 int err; 1329 struct p9_client *clnt; 1330 struct p9_req_t *req; 1331 struct p9_qid qid; 1332 int iounit; 1333 1334 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1335 fid->fid, name, perm, mode); 1336 clnt = fid->clnt; 1337 1338 if (fid->mode != -1) 1339 return -EINVAL; 1340 1341 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1342 mode & P9L_MODE_MASK, extension); 1343 if (IS_ERR(req)) { 1344 err = PTR_ERR(req); 1345 goto error; 1346 } 1347 1348 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1349 if (err) { 1350 trace_9p_protocol_dump(clnt, &req->rc); 1351 goto free_and_error; 1352 } 1353 1354 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1355 qid.type, qid.path, qid.version, iounit); 1356 1357 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1358 fid->mode = mode; 1359 fid->iounit = iounit; 1360 1361 free_and_error: 1362 p9_req_put(clnt, req); 1363 error: 1364 return err; 1365 } 1366 EXPORT_SYMBOL(p9_client_fcreate); 1367 1368 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1369 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1370 { 1371 int err; 1372 struct p9_client *clnt; 1373 struct p9_req_t *req; 1374 1375 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1376 dfid->fid, name, symtgt); 1377 clnt = dfid->clnt; 1378 1379 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1380 gid); 1381 if (IS_ERR(req)) { 1382 err = PTR_ERR(req); 1383 goto error; 1384 } 1385 1386 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 1387 if (err) { 1388 trace_9p_protocol_dump(clnt, &req->rc); 1389 goto free_and_error; 1390 } 1391 1392 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1393 qid->type, qid->path, qid->version); 1394 1395 free_and_error: 1396 p9_req_put(clnt, req); 1397 error: 1398 return err; 1399 } 1400 EXPORT_SYMBOL(p9_client_symlink); 1401 1402 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1403 { 1404 struct p9_client *clnt; 1405 struct p9_req_t *req; 1406 1407 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1408 dfid->fid, oldfid->fid, newname); 1409 clnt = dfid->clnt; 1410 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1411 newname); 1412 if (IS_ERR(req)) 1413 return PTR_ERR(req); 1414 1415 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1416 p9_req_put(clnt, req); 1417 return 0; 1418 } 1419 EXPORT_SYMBOL(p9_client_link); 1420 1421 int p9_client_fsync(struct p9_fid *fid, int datasync) 1422 { 1423 int err = 0; 1424 struct p9_client *clnt; 1425 struct p9_req_t *req; 1426 1427 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1428 fid->fid, datasync); 1429 clnt = fid->clnt; 1430 1431 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1432 if (IS_ERR(req)) { 1433 err = PTR_ERR(req); 1434 goto error; 1435 } 1436 1437 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1438 1439 p9_req_put(clnt, req); 1440 1441 error: 1442 return err; 1443 } 1444 EXPORT_SYMBOL(p9_client_fsync); 1445 1446 int p9_client_clunk(struct p9_fid *fid) 1447 { 1448 int err = 0; 1449 struct p9_client *clnt; 1450 struct p9_req_t *req; 1451 int retries = 0; 1452 1453 again: 1454 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", 1455 fid->fid, retries); 1456 clnt = fid->clnt; 1457 1458 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1459 if (IS_ERR(req)) { 1460 err = PTR_ERR(req); 1461 goto error; 1462 } 1463 1464 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1465 1466 p9_req_put(clnt, req); 1467 error: 1468 /* Fid is not valid even after a failed clunk 1469 * If interrupted, retry once then give up and 1470 * leak fid until umount. 1471 */ 1472 if (err == -ERESTARTSYS) { 1473 if (retries++ == 0) 1474 goto again; 1475 } else { 1476 p9_fid_destroy(fid); 1477 } 1478 return err; 1479 } 1480 EXPORT_SYMBOL(p9_client_clunk); 1481 1482 int p9_client_remove(struct p9_fid *fid) 1483 { 1484 int err = 0; 1485 struct p9_client *clnt; 1486 struct p9_req_t *req; 1487 1488 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1489 clnt = fid->clnt; 1490 1491 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1492 if (IS_ERR(req)) { 1493 err = PTR_ERR(req); 1494 goto error; 1495 } 1496 1497 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1498 1499 p9_req_put(clnt, req); 1500 error: 1501 if (err == -ERESTARTSYS) 1502 p9_fid_put(fid); 1503 else 1504 p9_fid_destroy(fid); 1505 return err; 1506 } 1507 EXPORT_SYMBOL(p9_client_remove); 1508 1509 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1510 { 1511 int err = 0; 1512 struct p9_req_t *req; 1513 struct p9_client *clnt; 1514 1515 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1516 dfid->fid, name, flags); 1517 1518 clnt = dfid->clnt; 1519 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1520 if (IS_ERR(req)) { 1521 err = PTR_ERR(req); 1522 goto error; 1523 } 1524 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1525 1526 p9_req_put(clnt, req); 1527 error: 1528 return err; 1529 } 1530 EXPORT_SYMBOL(p9_client_unlinkat); 1531 1532 int 1533 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1534 { 1535 int total = 0; 1536 *err = 0; 1537 1538 while (iov_iter_count(to)) { 1539 int count; 1540 1541 count = p9_client_read_once(fid, offset, to, err); 1542 if (!count || *err) 1543 break; 1544 offset += count; 1545 total += count; 1546 } 1547 return total; 1548 } 1549 EXPORT_SYMBOL(p9_client_read); 1550 1551 int 1552 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, 1553 int *err) 1554 { 1555 struct p9_client *clnt = fid->clnt; 1556 struct p9_req_t *req; 1557 int count = iov_iter_count(to); 1558 u32 rsize, received; 1559 bool non_zc = false; 1560 char *dataptr; 1561 1562 *err = 0; 1563 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n", 1564 fid->fid, offset, iov_iter_count(to)); 1565 1566 rsize = fid->iounit; 1567 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1568 rsize = clnt->msize - P9_IOHDRSZ; 1569 1570 if (count < rsize) 1571 rsize = count; 1572 1573 /* Don't bother zerocopy for small IO (< 1024) */ 1574 if (clnt->trans_mod->zc_request && rsize > 1024) { 1575 /* response header len is 11 1576 * PDU Header(7) + IO Size (4) 1577 */ 1578 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1579 0, 11, "dqd", fid->fid, 1580 offset, rsize); 1581 } else { 1582 non_zc = true; 1583 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1584 rsize); 1585 } 1586 if (IS_ERR(req)) { 1587 *err = PTR_ERR(req); 1588 if (!non_zc) 1589 iov_iter_revert(to, count - iov_iter_count(to)); 1590 return 0; 1591 } 1592 1593 *err = p9pdu_readf(&req->rc, clnt->proto_version, 1594 "D", &received, &dataptr); 1595 if (*err) { 1596 if (!non_zc) 1597 iov_iter_revert(to, count - iov_iter_count(to)); 1598 trace_9p_protocol_dump(clnt, &req->rc); 1599 p9_req_put(clnt, req); 1600 return 0; 1601 } 1602 if (rsize < received) { 1603 pr_err("bogus RREAD count (%u > %u)\n", received, rsize); 1604 *err = -EIO; 1605 p9_req_put(clnt, req); 1606 return 0; 1607 } 1608 1609 p9_debug(P9_DEBUG_9P, "<<< RREAD count %u\n", received); 1610 1611 if (non_zc) { 1612 int n = copy_to_iter(dataptr, received, to); 1613 1614 if (n != received) { 1615 *err = -EFAULT; 1616 p9_req_put(clnt, req); 1617 return n; 1618 } 1619 } else { 1620 iov_iter_revert(to, count - received - iov_iter_count(to)); 1621 } 1622 p9_req_put(clnt, req); 1623 return received; 1624 } 1625 EXPORT_SYMBOL(p9_client_read_once); 1626 1627 int 1628 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1629 { 1630 struct p9_client *clnt = fid->clnt; 1631 struct p9_req_t *req; 1632 int total = 0; 1633 *err = 0; 1634 1635 while (iov_iter_count(from)) { 1636 size_t count = iov_iter_count(from); 1637 u32 rsize = fid->iounit; 1638 u32 written; 1639 1640 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1641 rsize = clnt->msize - P9_IOHDRSZ; 1642 1643 if (count < rsize) 1644 rsize = count; 1645 1646 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %u (/%zu)\n", 1647 fid->fid, offset, rsize, count); 1648 1649 /* Don't bother zerocopy for small IO (< 1024) */ 1650 if (clnt->trans_mod->zc_request && rsize > 1024) { 1651 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1652 rsize, P9_ZC_HDR_SZ, "dqd", 1653 fid->fid, offset, rsize); 1654 } else { 1655 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1656 offset, rsize, from); 1657 } 1658 if (IS_ERR(req)) { 1659 iov_iter_revert(from, count - iov_iter_count(from)); 1660 *err = PTR_ERR(req); 1661 break; 1662 } 1663 1664 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written); 1665 if (*err) { 1666 iov_iter_revert(from, count - iov_iter_count(from)); 1667 trace_9p_protocol_dump(clnt, &req->rc); 1668 p9_req_put(clnt, req); 1669 break; 1670 } 1671 if (rsize < written) { 1672 pr_err("bogus RWRITE count (%u > %u)\n", written, rsize); 1673 *err = -EIO; 1674 iov_iter_revert(from, count - iov_iter_count(from)); 1675 p9_req_put(clnt, req); 1676 break; 1677 } 1678 1679 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %u\n", written); 1680 1681 p9_req_put(clnt, req); 1682 iov_iter_revert(from, count - written - iov_iter_count(from)); 1683 total += written; 1684 offset += written; 1685 } 1686 return total; 1687 } 1688 EXPORT_SYMBOL(p9_client_write); 1689 1690 void 1691 p9_client_write_subreq(struct netfs_io_subrequest *subreq) 1692 { 1693 struct netfs_io_request *wreq = subreq->rreq; 1694 struct p9_fid *fid = wreq->netfs_priv; 1695 struct p9_client *clnt = fid->clnt; 1696 struct p9_req_t *req; 1697 unsigned long long start = subreq->start + subreq->transferred; 1698 int written, len = subreq->len - subreq->transferred; 1699 int err; 1700 1701 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu len %d\n", 1702 fid->fid, start, len); 1703 1704 /* Don't bother zerocopy for small IO (< 1024) */ 1705 if (clnt->trans_mod->zc_request && len > 1024) { 1706 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, &subreq->io_iter, 1707 0, wreq->len, P9_ZC_HDR_SZ, "dqd", 1708 fid->fid, start, len); 1709 } else { 1710 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1711 start, len, &subreq->io_iter); 1712 } 1713 if (IS_ERR(req)) { 1714 netfs_write_subrequest_terminated(subreq, PTR_ERR(req)); 1715 return; 1716 } 1717 1718 err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written); 1719 if (err) { 1720 trace_9p_protocol_dump(clnt, &req->rc); 1721 p9_req_put(clnt, req); 1722 netfs_write_subrequest_terminated(subreq, err); 1723 return; 1724 } 1725 1726 if (written > len) { 1727 pr_err("bogus RWRITE count (%d > %u)\n", written, len); 1728 written = -EIO; 1729 } 1730 1731 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", len); 1732 1733 p9_req_put(clnt, req); 1734 netfs_write_subrequest_terminated(subreq, written); 1735 } 1736 EXPORT_SYMBOL(p9_client_write_subreq); 1737 1738 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1739 { 1740 int err; 1741 struct p9_client *clnt; 1742 struct p9_wstat *ret; 1743 struct p9_req_t *req; 1744 u16 ignored; 1745 1746 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1747 1748 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1749 if (!ret) 1750 return ERR_PTR(-ENOMEM); 1751 1752 clnt = fid->clnt; 1753 1754 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1755 if (IS_ERR(req)) { 1756 err = PTR_ERR(req); 1757 goto error; 1758 } 1759 1760 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); 1761 if (err) { 1762 trace_9p_protocol_dump(clnt, &req->rc); 1763 p9_req_put(clnt, req); 1764 goto error; 1765 } 1766 1767 p9_debug(P9_DEBUG_9P, 1768 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1769 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1770 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1771 "<<< uid=%d gid=%d n_muid=%d\n", 1772 ret->size, ret->type, ret->dev, ret->qid.type, ret->qid.path, 1773 ret->qid.version, ret->mode, 1774 ret->atime, ret->mtime, ret->length, 1775 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1776 from_kuid(&init_user_ns, ret->n_uid), 1777 from_kgid(&init_user_ns, ret->n_gid), 1778 from_kuid(&init_user_ns, ret->n_muid)); 1779 1780 p9_req_put(clnt, req); 1781 return ret; 1782 1783 error: 1784 kfree(ret); 1785 return ERR_PTR(err); 1786 } 1787 EXPORT_SYMBOL(p9_client_stat); 1788 1789 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1790 u64 request_mask) 1791 { 1792 int err; 1793 struct p9_client *clnt; 1794 struct p9_stat_dotl *ret; 1795 struct p9_req_t *req; 1796 1797 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1798 fid->fid, request_mask); 1799 1800 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1801 if (!ret) 1802 return ERR_PTR(-ENOMEM); 1803 1804 clnt = fid->clnt; 1805 1806 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1807 if (IS_ERR(req)) { 1808 err = PTR_ERR(req); 1809 goto error; 1810 } 1811 1812 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); 1813 if (err) { 1814 trace_9p_protocol_dump(clnt, &req->rc); 1815 p9_req_put(clnt, req); 1816 goto error; 1817 } 1818 1819 p9_debug(P9_DEBUG_9P, "<<< RGETATTR st_result_mask=%lld\n" 1820 "<<< qid=%x.%llx.%x\n" 1821 "<<< st_mode=%8.8x st_nlink=%llu\n" 1822 "<<< st_uid=%d st_gid=%d\n" 1823 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1824 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1825 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1826 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1827 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1828 "<<< st_gen=%lld st_data_version=%lld\n", 1829 ret->st_result_mask, 1830 ret->qid.type, ret->qid.path, ret->qid.version, 1831 ret->st_mode, ret->st_nlink, 1832 from_kuid(&init_user_ns, ret->st_uid), 1833 from_kgid(&init_user_ns, ret->st_gid), 1834 ret->st_rdev, ret->st_size, ret->st_blksize, ret->st_blocks, 1835 ret->st_atime_sec, ret->st_atime_nsec, 1836 ret->st_mtime_sec, ret->st_mtime_nsec, 1837 ret->st_ctime_sec, ret->st_ctime_nsec, 1838 ret->st_btime_sec, ret->st_btime_nsec, 1839 ret->st_gen, ret->st_data_version); 1840 1841 p9_req_put(clnt, req); 1842 return ret; 1843 1844 error: 1845 kfree(ret); 1846 return ERR_PTR(err); 1847 } 1848 EXPORT_SYMBOL(p9_client_getattr_dotl); 1849 1850 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1851 { 1852 int ret; 1853 1854 /* NOTE: size shouldn't include its own length */ 1855 /* size[2] type[2] dev[4] qid[13] */ 1856 /* mode[4] atime[4] mtime[4] length[8]*/ 1857 /* name[s] uid[s] gid[s] muid[s] */ 1858 ret = 2 + 4 + 13 + 4 + 4 + 4 + 8 + 2 + 2 + 2 + 2; 1859 1860 if (wst->name) 1861 ret += strlen(wst->name); 1862 if (wst->uid) 1863 ret += strlen(wst->uid); 1864 if (wst->gid) 1865 ret += strlen(wst->gid); 1866 if (wst->muid) 1867 ret += strlen(wst->muid); 1868 1869 if (proto_version == p9_proto_2000u || 1870 proto_version == p9_proto_2000L) { 1871 /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1872 ret += 2 + 4 + 4 + 4; 1873 if (wst->extension) 1874 ret += strlen(wst->extension); 1875 } 1876 1877 return ret; 1878 } 1879 1880 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1881 { 1882 int err = 0; 1883 struct p9_req_t *req; 1884 struct p9_client *clnt; 1885 1886 clnt = fid->clnt; 1887 wst->size = p9_client_statsize(wst, clnt->proto_version); 1888 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", 1889 fid->fid); 1890 p9_debug(P9_DEBUG_9P, 1891 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1892 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1893 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1894 " uid=%d gid=%d n_muid=%d\n", 1895 wst->size, wst->type, wst->dev, wst->qid.type, 1896 wst->qid.path, wst->qid.version, 1897 wst->mode, wst->atime, wst->mtime, wst->length, 1898 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1899 from_kuid(&init_user_ns, wst->n_uid), 1900 from_kgid(&init_user_ns, wst->n_gid), 1901 from_kuid(&init_user_ns, wst->n_muid)); 1902 1903 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", 1904 fid->fid, wst->size + 2, wst); 1905 if (IS_ERR(req)) { 1906 err = PTR_ERR(req); 1907 goto error; 1908 } 1909 1910 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1911 1912 p9_req_put(clnt, req); 1913 error: 1914 return err; 1915 } 1916 EXPORT_SYMBOL(p9_client_wstat); 1917 1918 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1919 { 1920 int err = 0; 1921 struct p9_req_t *req; 1922 struct p9_client *clnt; 1923 1924 clnt = fid->clnt; 1925 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1926 p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n", 1927 p9attr->valid, p9attr->mode, 1928 from_kuid(&init_user_ns, p9attr->uid), 1929 from_kgid(&init_user_ns, p9attr->gid), 1930 p9attr->size); 1931 p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n", 1932 p9attr->atime_sec, p9attr->atime_nsec); 1933 p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n", 1934 p9attr->mtime_sec, p9attr->mtime_nsec); 1935 1936 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1937 1938 if (IS_ERR(req)) { 1939 err = PTR_ERR(req); 1940 goto error; 1941 } 1942 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1943 p9_req_put(clnt, req); 1944 error: 1945 return err; 1946 } 1947 EXPORT_SYMBOL(p9_client_setattr); 1948 1949 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1950 { 1951 int err; 1952 struct p9_req_t *req; 1953 struct p9_client *clnt; 1954 1955 clnt = fid->clnt; 1956 1957 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1958 1959 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1960 if (IS_ERR(req)) { 1961 err = PTR_ERR(req); 1962 goto error; 1963 } 1964 1965 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1966 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1967 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1968 if (err) { 1969 trace_9p_protocol_dump(clnt, &req->rc); 1970 p9_req_put(clnt, req); 1971 goto error; 1972 } 1973 1974 p9_debug(P9_DEBUG_9P, 1975 "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n", 1976 fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree, 1977 sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen); 1978 1979 p9_req_put(clnt, req); 1980 error: 1981 return err; 1982 } 1983 EXPORT_SYMBOL(p9_client_statfs); 1984 1985 int p9_client_rename(struct p9_fid *fid, 1986 struct p9_fid *newdirfid, const char *name) 1987 { 1988 int err = 0; 1989 struct p9_req_t *req; 1990 struct p9_client *clnt; 1991 1992 clnt = fid->clnt; 1993 1994 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1995 fid->fid, newdirfid->fid, name); 1996 1997 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1998 newdirfid->fid, name); 1999 if (IS_ERR(req)) { 2000 err = PTR_ERR(req); 2001 goto error; 2002 } 2003 2004 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 2005 2006 p9_req_put(clnt, req); 2007 error: 2008 return err; 2009 } 2010 EXPORT_SYMBOL(p9_client_rename); 2011 2012 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 2013 struct p9_fid *newdirfid, const char *new_name) 2014 { 2015 int err = 0; 2016 struct p9_req_t *req; 2017 struct p9_client *clnt; 2018 2019 clnt = olddirfid->clnt; 2020 2021 p9_debug(P9_DEBUG_9P, 2022 ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n", 2023 olddirfid->fid, old_name, newdirfid->fid, new_name); 2024 2025 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 2026 old_name, newdirfid->fid, new_name); 2027 if (IS_ERR(req)) { 2028 err = PTR_ERR(req); 2029 goto error; 2030 } 2031 2032 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 2033 newdirfid->fid, new_name); 2034 2035 p9_req_put(clnt, req); 2036 error: 2037 return err; 2038 } 2039 EXPORT_SYMBOL(p9_client_renameat); 2040 2041 /* An xattrwalk without @attr_name gives the fid for the lisxattr namespace 2042 */ 2043 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 2044 const char *attr_name, u64 *attr_size) 2045 { 2046 int err; 2047 struct p9_req_t *req; 2048 struct p9_client *clnt; 2049 struct p9_fid *attr_fid; 2050 2051 clnt = file_fid->clnt; 2052 attr_fid = p9_fid_create(clnt); 2053 if (!attr_fid) { 2054 err = -ENOMEM; 2055 goto error; 2056 } 2057 p9_debug(P9_DEBUG_9P, 2058 ">>> TXATTRWALK file_fid %d, attr_fid %d name '%s'\n", 2059 file_fid->fid, attr_fid->fid, attr_name); 2060 2061 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 2062 file_fid->fid, attr_fid->fid, attr_name); 2063 if (IS_ERR(req)) { 2064 err = PTR_ERR(req); 2065 goto error; 2066 } 2067 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); 2068 if (err) { 2069 trace_9p_protocol_dump(clnt, &req->rc); 2070 p9_req_put(clnt, req); 2071 goto clunk_fid; 2072 } 2073 p9_req_put(clnt, req); 2074 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2075 attr_fid->fid, *attr_size); 2076 return attr_fid; 2077 clunk_fid: 2078 p9_fid_put(attr_fid); 2079 attr_fid = NULL; 2080 error: 2081 if (attr_fid && attr_fid != file_fid) 2082 p9_fid_destroy(attr_fid); 2083 2084 return ERR_PTR(err); 2085 } 2086 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2087 2088 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2089 u64 attr_size, int flags) 2090 { 2091 int err = 0; 2092 struct p9_req_t *req; 2093 struct p9_client *clnt; 2094 2095 p9_debug(P9_DEBUG_9P, 2096 ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n", 2097 fid->fid, name, attr_size, flags); 2098 clnt = fid->clnt; 2099 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2100 fid->fid, name, attr_size, flags); 2101 if (IS_ERR(req)) { 2102 err = PTR_ERR(req); 2103 goto error; 2104 } 2105 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2106 p9_req_put(clnt, req); 2107 error: 2108 return err; 2109 } 2110 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2111 2112 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2113 { 2114 int err, non_zc = 0; 2115 u32 rsize; 2116 struct p9_client *clnt; 2117 struct p9_req_t *req; 2118 char *dataptr; 2119 struct kvec kv = {.iov_base = data, .iov_len = count}; 2120 struct iov_iter to; 2121 2122 iov_iter_kvec(&to, ITER_DEST, &kv, 1, count); 2123 2124 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %u\n", 2125 fid->fid, offset, count); 2126 2127 clnt = fid->clnt; 2128 2129 rsize = fid->iounit; 2130 if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ) 2131 rsize = clnt->msize - P9_READDIRHDRSZ; 2132 2133 if (count < rsize) 2134 rsize = count; 2135 2136 /* Don't bother zerocopy for small IO (< 1024) */ 2137 if (clnt->trans_mod->zc_request && rsize > 1024) { 2138 /* response header len is 11 2139 * PDU Header(7) + IO Size (4) 2140 */ 2141 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2142 11, "dqd", fid->fid, offset, rsize); 2143 } else { 2144 non_zc = 1; 2145 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2146 offset, rsize); 2147 } 2148 if (IS_ERR(req)) { 2149 err = PTR_ERR(req); 2150 goto error; 2151 } 2152 2153 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); 2154 if (err) { 2155 trace_9p_protocol_dump(clnt, &req->rc); 2156 goto free_and_error; 2157 } 2158 if (rsize < count) { 2159 pr_err("bogus RREADDIR count (%u > %u)\n", count, rsize); 2160 err = -EIO; 2161 goto free_and_error; 2162 } 2163 2164 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %u\n", count); 2165 2166 if (non_zc) 2167 memmove(data, dataptr, count); 2168 2169 p9_req_put(clnt, req); 2170 return count; 2171 2172 free_and_error: 2173 p9_req_put(clnt, req); 2174 error: 2175 return err; 2176 } 2177 EXPORT_SYMBOL(p9_client_readdir); 2178 2179 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2180 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2181 { 2182 int err; 2183 struct p9_client *clnt; 2184 struct p9_req_t *req; 2185 2186 clnt = fid->clnt; 2187 p9_debug(P9_DEBUG_9P, 2188 ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n", 2189 fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2190 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2191 MAJOR(rdev), MINOR(rdev), gid); 2192 if (IS_ERR(req)) 2193 return PTR_ERR(req); 2194 2195 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2196 if (err) { 2197 trace_9p_protocol_dump(clnt, &req->rc); 2198 goto error; 2199 } 2200 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", 2201 qid->type, qid->path, qid->version); 2202 2203 error: 2204 p9_req_put(clnt, req); 2205 return err; 2206 } 2207 EXPORT_SYMBOL(p9_client_mknod_dotl); 2208 2209 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2210 kgid_t gid, struct p9_qid *qid) 2211 { 2212 int err; 2213 struct p9_client *clnt; 2214 struct p9_req_t *req; 2215 2216 clnt = fid->clnt; 2217 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2218 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2219 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", 2220 fid->fid, name, mode, gid); 2221 if (IS_ERR(req)) 2222 return PTR_ERR(req); 2223 2224 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2225 if (err) { 2226 trace_9p_protocol_dump(clnt, &req->rc); 2227 goto error; 2228 } 2229 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2230 qid->path, qid->version); 2231 2232 error: 2233 p9_req_put(clnt, req); 2234 return err; 2235 } 2236 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2237 2238 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2239 { 2240 int err; 2241 struct p9_client *clnt; 2242 struct p9_req_t *req; 2243 2244 clnt = fid->clnt; 2245 p9_debug(P9_DEBUG_9P, 2246 ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n", 2247 fid->fid, flock->type, flock->flags, flock->start, 2248 flock->length, flock->proc_id, flock->client_id); 2249 2250 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2251 flock->flags, flock->start, flock->length, 2252 flock->proc_id, flock->client_id); 2253 2254 if (IS_ERR(req)) 2255 return PTR_ERR(req); 2256 2257 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); 2258 if (err) { 2259 trace_9p_protocol_dump(clnt, &req->rc); 2260 goto error; 2261 } 2262 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2263 error: 2264 p9_req_put(clnt, req); 2265 return err; 2266 } 2267 EXPORT_SYMBOL(p9_client_lock_dotl); 2268 2269 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2270 { 2271 int err; 2272 struct p9_client *clnt; 2273 struct p9_req_t *req; 2274 2275 clnt = fid->clnt; 2276 p9_debug(P9_DEBUG_9P, 2277 ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n", 2278 fid->fid, glock->type, glock->start, glock->length, 2279 glock->proc_id, glock->client_id); 2280 2281 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, 2282 glock->type, glock->start, glock->length, 2283 glock->proc_id, glock->client_id); 2284 2285 if (IS_ERR(req)) 2286 return PTR_ERR(req); 2287 2288 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, 2289 &glock->start, &glock->length, &glock->proc_id, 2290 &glock->client_id); 2291 if (err) { 2292 trace_9p_protocol_dump(clnt, &req->rc); 2293 goto error; 2294 } 2295 p9_debug(P9_DEBUG_9P, 2296 "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n", 2297 glock->type, glock->start, glock->length, 2298 glock->proc_id, glock->client_id); 2299 error: 2300 p9_req_put(clnt, req); 2301 return err; 2302 } 2303 EXPORT_SYMBOL(p9_client_getlock_dotl); 2304 2305 int p9_client_readlink(struct p9_fid *fid, char **target) 2306 { 2307 int err; 2308 struct p9_client *clnt; 2309 struct p9_req_t *req; 2310 2311 clnt = fid->clnt; 2312 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2313 2314 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2315 if (IS_ERR(req)) 2316 return PTR_ERR(req); 2317 2318 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); 2319 if (err) { 2320 trace_9p_protocol_dump(clnt, &req->rc); 2321 goto error; 2322 } 2323 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2324 error: 2325 p9_req_put(clnt, req); 2326 return err; 2327 } 2328 EXPORT_SYMBOL(p9_client_readlink); 2329 2330 int __init p9_client_init(void) 2331 { 2332 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); 2333 return p9_req_cache ? 0 : -ENOMEM; 2334 } 2335 2336 void __exit p9_client_exit(void) 2337 { 2338 kmem_cache_destroy(p9_req_cache); 2339 } 2340