1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * 9P Client 4 * 5 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> 6 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net> 7 */ 8 9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 10 11#include <linux/module.h> 12#include <linux/errno.h> 13#include <linux/fs.h> 14#include <linux/poll.h> 15#include <linux/idr.h> 16#include <linux/mutex.h> 17#include <linux/slab.h> 18#include <linux/sched/signal.h> 19#include <linux/uaccess.h> 20#include <linux/uio.h> 21#include <net/9p/9p.h> 22#include <linux/parser.h> 23#include <linux/seq_file.h> 24#include <net/9p/client.h> 25#include <net/9p/transport.h> 26#include "protocol.h" 27 28#define CREATE_TRACE_POINTS 29#include <trace/events/9p.h> 30 31/* DEFAULT MSIZE = 32 pages worth of payload + P9_HDRSZ + 32 * room for write (16 extra) or read (11 extra) operands. 33 */ 34 35#define DEFAULT_MSIZE ((128 * 1024) + P9_IOHDRSZ) 36 37/* Client Option Parsing (code inspired by NFS code) 38 * - a little lazy - parse all client options 39 */ 40 41enum { 42 Opt_msize, 43 Opt_trans, 44 Opt_legacy, 45 Opt_version, 46 Opt_err, 47}; 48 49static const match_table_t tokens = { 50 {Opt_msize, "msize=%u"}, 51 {Opt_legacy, "noextend"}, 52 {Opt_trans, "trans=%s"}, 53 {Opt_version, "version=%s"}, 54 {Opt_err, NULL}, 55}; 56 57inline int p9_is_proto_dotl(struct p9_client *clnt) 58{ 59 return clnt->proto_version == p9_proto_2000L; 60} 61EXPORT_SYMBOL(p9_is_proto_dotl); 62 63inline int p9_is_proto_dotu(struct p9_client *clnt) 64{ 65 return clnt->proto_version == p9_proto_2000u; 66} 67EXPORT_SYMBOL(p9_is_proto_dotu); 68 69int p9_show_client_options(struct seq_file *m, struct p9_client *clnt) 70{ 71 if (clnt->msize != DEFAULT_MSIZE) 72 seq_printf(m, ",msize=%u", clnt->msize); 73 seq_printf(m, ",trans=%s", clnt->trans_mod->name); 74 75 switch (clnt->proto_version) { 76 case p9_proto_legacy: 77 seq_puts(m, ",noextend"); 78 break; 79 case p9_proto_2000u: 80 seq_puts(m, ",version=9p2000.u"); 81 break; 82 case p9_proto_2000L: 83 /* Default */ 84 break; 85 } 86 87 if (clnt->trans_mod->show_options) 88 return clnt->trans_mod->show_options(m, clnt); 89 return 0; 90} 91EXPORT_SYMBOL(p9_show_client_options); 92 93/* Some error codes are taken directly from the server replies, 94 * make sure they are valid. 95 */ 96static int safe_errno(int err) 97{ 98 if (err > 0 || err < -MAX_ERRNO) { 99 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err); 100 return -EPROTO; 101 } 102 return err; 103} 104 105/* Interpret mount option for protocol version */ 106static int get_protocol_version(char *s) 107{ 108 int version = -EINVAL; 109 110 if (!strcmp(s, "9p2000")) { 111 version = p9_proto_legacy; 112 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n"); 113 } else if (!strcmp(s, "9p2000.u")) { 114 version = p9_proto_2000u; 115 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); 116 } else if (!strcmp(s, "9p2000.L")) { 117 version = p9_proto_2000L; 118 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); 119 } else { 120 pr_info("Unknown protocol version %s\n", s); 121 } 122 123 return version; 124} 125 126/** 127 * parse_opts - parse mount options into client structure 128 * @opts: options string passed from mount 129 * @clnt: existing v9fs client information 130 * 131 * Return 0 upon success, -ERRNO upon failure 132 */ 133 134static int parse_opts(char *opts, struct p9_client *clnt) 135{ 136 char *options, *tmp_options; 137 char *p; 138 substring_t args[MAX_OPT_ARGS]; 139 int option; 140 char *s; 141 int ret = 0; 142 143 clnt->proto_version = p9_proto_2000L; 144 clnt->msize = DEFAULT_MSIZE; 145 146 if (!opts) 147 return 0; 148 149 tmp_options = kstrdup(opts, GFP_KERNEL); 150 if (!tmp_options) 151 return -ENOMEM; 152 options = tmp_options; 153 154 while ((p = strsep(&options, ",")) != NULL) { 155 int token, r; 156 157 if (!*p) 158 continue; 159 token = match_token(p, tokens, args); 160 switch (token) { 161 case Opt_msize: 162 r = match_int(&args[0], &option); 163 if (r < 0) { 164 p9_debug(P9_DEBUG_ERROR, 165 "integer field, but no integer?\n"); 166 ret = r; 167 continue; 168 } 169 if (option < 4096) { 170 p9_debug(P9_DEBUG_ERROR, 171 "msize should be at least 4k\n"); 172 ret = -EINVAL; 173 continue; 174 } 175 clnt->msize = option; 176 break; 177 case Opt_trans: 178 s = match_strdup(&args[0]); 179 if (!s) { 180 ret = -ENOMEM; 181 p9_debug(P9_DEBUG_ERROR, 182 "problem allocating copy of trans arg\n"); 183 goto free_and_return; 184 } 185 186 v9fs_put_trans(clnt->trans_mod); 187 clnt->trans_mod = v9fs_get_trans_by_name(s); 188 if (!clnt->trans_mod) { 189 pr_info("Could not find request transport: %s\n", 190 s); 191 ret = -EINVAL; 192 } 193 kfree(s); 194 break; 195 case Opt_legacy: 196 clnt->proto_version = p9_proto_legacy; 197 break; 198 case Opt_version: 199 s = match_strdup(&args[0]); 200 if (!s) { 201 ret = -ENOMEM; 202 p9_debug(P9_DEBUG_ERROR, 203 "problem allocating copy of version arg\n"); 204 goto free_and_return; 205 } 206 r = get_protocol_version(s); 207 if (r < 0) 208 ret = r; 209 else 210 clnt->proto_version = r; 211 kfree(s); 212 break; 213 default: 214 continue; 215 } 216 } 217 218free_and_return: 219 if (ret) 220 v9fs_put_trans(clnt->trans_mod); 221 kfree(tmp_options); 222 return ret; 223} 224 225static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc, 226 int alloc_msize) 227{ 228 if (likely(c->fcall_cache) && alloc_msize == c->msize) { 229 fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS); 230 fc->cache = c->fcall_cache; 231 } else { 232 fc->sdata = kmalloc(alloc_msize, GFP_NOFS); 233 fc->cache = NULL; 234 } 235 if (!fc->sdata) 236 return -ENOMEM; 237 fc->capacity = alloc_msize; 238 return 0; 239} 240 241void p9_fcall_fini(struct p9_fcall *fc) 242{ 243 /* sdata can be NULL for interrupted requests in trans_rdma, 244 * and kmem_cache_free does not do NULL-check for us 245 */ 246 if (unlikely(!fc->sdata)) 247 return; 248 249 if (fc->cache) 250 kmem_cache_free(fc->cache, fc->sdata); 251 else 252 kfree(fc->sdata); 253} 254EXPORT_SYMBOL(p9_fcall_fini); 255 256static struct kmem_cache *p9_req_cache; 257 258/** 259 * p9_tag_alloc - Allocate a new request. 260 * @c: Client session. 261 * @type: Transaction type. 262 * @t_size: Buffer size for holding this request 263 * (automatic calculation by format template if 0). 264 * @r_size: Buffer size for holding server's reply on this request 265 * (automatic calculation by format template if 0). 266 * @fmt: Format template for assembling 9p request message 267 * (see p9pdu_vwritef). 268 * @ap: Variable arguments to be fed to passed format template 269 * (see p9pdu_vwritef). 270 * 271 * Context: Process context. 272 * Return: Pointer to new request. 273 */ 274static struct p9_req_t * 275p9_tag_alloc(struct p9_client *c, int8_t type, uint t_size, uint r_size, 276 const char *fmt, va_list ap) 277{ 278 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); 279 int alloc_tsize; 280 int alloc_rsize; 281 int tag; 282 va_list apc; 283 284 va_copy(apc, ap); 285 alloc_tsize = min_t(size_t, c->msize, 286 t_size ?: p9_msg_buf_size(c, type, fmt, apc)); 287 va_end(apc); 288 289 alloc_rsize = min_t(size_t, c->msize, 290 r_size ?: p9_msg_buf_size(c, type + 1, fmt, ap)); 291 292 if (!req) 293 return ERR_PTR(-ENOMEM); 294 295 if (p9_fcall_init(c, &req->tc, alloc_tsize)) 296 goto free_req; 297 if (p9_fcall_init(c, &req->rc, alloc_rsize)) 298 goto free; 299 300 p9pdu_reset(&req->tc); 301 p9pdu_reset(&req->rc); 302 req->t_err = 0; 303 req->status = REQ_STATUS_ALLOC; 304 /* refcount needs to be set to 0 before inserting into the idr 305 * so p9_tag_lookup does not accept a request that is not fully 306 * initialized. refcount_set to 2 below will mark request ready. 307 */ 308 refcount_set(&req->refcount, 0); 309 init_waitqueue_head(&req->wq); 310 INIT_LIST_HEAD(&req->req_list); 311 312 idr_preload(GFP_NOFS); 313 spin_lock_irq(&c->lock); 314 if (type == P9_TVERSION) 315 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1, 316 GFP_NOWAIT); 317 else 318 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT); 319 req->tc.tag = tag; 320 spin_unlock_irq(&c->lock); 321 idr_preload_end(); 322 if (tag < 0) 323 goto free; 324 325 /* Init ref to two because in the general case there is one ref 326 * that is put asynchronously by a writer thread, one ref 327 * temporarily given by p9_tag_lookup and put by p9_client_cb 328 * in the recv thread, and one ref put by p9_req_put in the 329 * main thread. The only exception is virtio that does not use 330 * p9_tag_lookup but does not have a writer thread either 331 * (the write happens synchronously in the request/zc_request 332 * callback), so p9_client_cb eats the second ref there 333 * as the pointer is duplicated directly by virtqueue_add_sgs() 334 */ 335 refcount_set(&req->refcount, 2); 336 337 return req; 338 339free: 340 p9_fcall_fini(&req->tc); 341 p9_fcall_fini(&req->rc); 342free_req: 343 kmem_cache_free(p9_req_cache, req); 344 return ERR_PTR(-ENOMEM); 345} 346 347/** 348 * p9_tag_lookup - Look up a request by tag. 349 * @c: Client session. 350 * @tag: Transaction ID. 351 * 352 * Context: Any context. 353 * Return: A request, or %NULL if there is no request with that tag. 354 */ 355struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 356{ 357 struct p9_req_t *req; 358 359 rcu_read_lock(); 360again: 361 req = idr_find(&c->reqs, tag); 362 if (req) { 363 /* We have to be careful with the req found under rcu_read_lock 364 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the 365 * ref again without corrupting other data, then check again 366 * that the tag matches once we have the ref 367 */ 368 if (!p9_req_try_get(req)) 369 goto again; 370 if (req->tc.tag != tag) { 371 p9_req_put(c, req); 372 goto again; 373 } 374 } 375 rcu_read_unlock(); 376 377 return req; 378} 379EXPORT_SYMBOL(p9_tag_lookup); 380 381/** 382 * p9_tag_remove - Remove a tag. 383 * @c: Client session. 384 * @r: Request of reference. 385 * 386 * Context: Any context. 387 */ 388static void p9_tag_remove(struct p9_client *c, struct p9_req_t *r) 389{ 390 unsigned long flags; 391 u16 tag = r->tc.tag; 392 393 p9_debug(P9_DEBUG_MUX, "freeing clnt %p req %p tag: %d\n", c, r, tag); 394 spin_lock_irqsave(&c->lock, flags); 395 idr_remove(&c->reqs, tag); 396 spin_unlock_irqrestore(&c->lock, flags); 397} 398 399int p9_req_put(struct p9_client *c, struct p9_req_t *r) 400{ 401 if (refcount_dec_and_test(&r->refcount)) { 402 p9_tag_remove(c, r); 403 404 p9_fcall_fini(&r->tc); 405 p9_fcall_fini(&r->rc); 406 kmem_cache_free(p9_req_cache, r); 407 return 1; 408 } 409 return 0; 410} 411EXPORT_SYMBOL(p9_req_put); 412 413/** 414 * p9_tag_cleanup - cleans up tags structure and reclaims resources 415 * @c: v9fs client struct 416 * 417 * This frees resources associated with the tags structure 418 * 419 */ 420static void p9_tag_cleanup(struct p9_client *c) 421{ 422 struct p9_req_t *req; 423 int id; 424 425 rcu_read_lock(); 426 idr_for_each_entry(&c->reqs, req, id) { 427 pr_info("Tag %d still in use\n", id); 428 if (p9_req_put(c, req) == 0) 429 pr_warn("Packet with tag %d has still references", 430 req->tc.tag); 431 } 432 rcu_read_unlock(); 433} 434 435/** 436 * p9_client_cb - call back from transport to client 437 * @c: client state 438 * @req: request received 439 * @status: request status, one of REQ_STATUS_* 440 * 441 */ 442void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) 443{ 444 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); 445 446 /* This barrier is needed to make sure any change made to req before 447 * the status change is visible to another thread 448 */ 449 smp_wmb(); 450 WRITE_ONCE(req->status, status); 451 452 wake_up(&req->wq); 453 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); 454 p9_req_put(c, req); 455} 456EXPORT_SYMBOL(p9_client_cb); 457 458/** 459 * p9_parse_header - parse header arguments out of a packet 460 * @pdu: packet to parse 461 * @size: size of packet 462 * @type: type of request 463 * @tag: tag of packet 464 * @rewind: set if we need to rewind offset afterwards 465 */ 466 467int 468p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, 469 int16_t *tag, int rewind) 470{ 471 s8 r_type; 472 s16 r_tag; 473 s32 r_size; 474 int offset = pdu->offset; 475 int err; 476 477 pdu->offset = 0; 478 479 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 480 if (err) 481 goto rewind_and_exit; 482 483 if (type) 484 *type = r_type; 485 if (tag) 486 *tag = r_tag; 487 if (size) 488 *size = r_size; 489 490 if (pdu->size != r_size || r_size < 7) { 491 err = -EINVAL; 492 goto rewind_and_exit; 493 } 494 495 pdu->id = r_type; 496 pdu->tag = r_tag; 497 498 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 499 pdu->size, pdu->id, pdu->tag); 500 501rewind_and_exit: 502 if (rewind) 503 pdu->offset = offset; 504 return err; 505} 506EXPORT_SYMBOL(p9_parse_header); 507 508/** 509 * p9_check_errors - check 9p packet for error return and process it 510 * @c: current client instance 511 * @req: request to parse and check for error conditions 512 * 513 * returns error code if one is discovered, otherwise returns 0 514 * 515 * this will have to be more complicated if we have multiple 516 * error packet types 517 */ 518 519static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 520{ 521 s8 type; 522 int err; 523 int ecode; 524 525 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 526 if (req->rc.size > req->rc.capacity && !req->rc.zc) { 527 pr_err("requested packet size too big: %d does not fit %zu (type=%d)\n", 528 req->rc.size, req->rc.capacity, req->rc.id); 529 return -EIO; 530 } 531 /* dump the response from server 532 * This should be after check errors which poplulate pdu_fcall. 533 */ 534 trace_9p_protocol_dump(c, &req->rc); 535 if (err) { 536 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 537 return err; 538 } 539 if (type != P9_RERROR && type != P9_RLERROR) 540 return 0; 541 542 if (!p9_is_proto_dotl(c)) { 543 char *ename = NULL; 544 545 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 546 &ename, &ecode); 547 if (err) { 548 kfree(ename); 549 goto out_err; 550 } 551 552 if (p9_is_proto_dotu(c) && ecode < 512) 553 err = -ecode; 554 555 if (!err) { 556 err = p9_errstr2errno(ename, strlen(ename)); 557 558 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 559 -ecode, ename); 560 } 561 kfree(ename); 562 } else { 563 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 564 if (err) 565 goto out_err; 566 err = -ecode; 567 568 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 569 } 570 571 return err; 572 573out_err: 574 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 575 576 return err; 577} 578 579static struct p9_req_t * 580p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 581 582/** 583 * p9_client_flush - flush (cancel) a request 584 * @c: client state 585 * @oldreq: request to cancel 586 * 587 * This sents a flush for a particular request and links 588 * the flush request to the original request. The current 589 * code only supports a single flush request although the protocol 590 * allows for multiple flush requests to be sent for a single request. 591 * 592 */ 593 594static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 595{ 596 struct p9_req_t *req; 597 s16 oldtag; 598 int err; 599 600 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); 601 if (err) 602 return err; 603 604 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 605 606 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 607 if (IS_ERR(req)) 608 return PTR_ERR(req); 609 610 /* if we haven't received a response for oldreq, 611 * remove it from the list 612 */ 613 if (READ_ONCE(oldreq->status) == REQ_STATUS_SENT) { 614 if (c->trans_mod->cancelled) 615 c->trans_mod->cancelled(c, oldreq); 616 } 617 618 p9_req_put(c, req); 619 return 0; 620} 621 622static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 623 int8_t type, uint t_size, uint r_size, 624 const char *fmt, va_list ap) 625{ 626 int err; 627 struct p9_req_t *req; 628 va_list apc; 629 630 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 631 632 /* we allow for any status other than disconnected */ 633 if (c->status == Disconnected) 634 return ERR_PTR(-EIO); 635 636 /* if status is begin_disconnected we allow only clunk request */ 637 if (c->status == BeginDisconnect && type != P9_TCLUNK) 638 return ERR_PTR(-EIO); 639 640 va_copy(apc, ap); 641 req = p9_tag_alloc(c, type, t_size, r_size, fmt, apc); 642 va_end(apc); 643 if (IS_ERR(req)) 644 return req; 645 646 /* marshall the data */ 647 p9pdu_prepare(&req->tc, req->tc.tag, type); 648 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); 649 if (err) 650 goto reterr; 651 p9pdu_finalize(c, &req->tc); 652 trace_9p_client_req(c, type, req->tc.tag); 653 return req; 654reterr: 655 p9_req_put(c, req); 656 /* We have to put also the 2nd reference as it won't be used */ 657 p9_req_put(c, req); 658 return ERR_PTR(err); 659} 660 661/** 662 * p9_client_rpc - issue a request and wait for a response 663 * @c: client session 664 * @type: type of request 665 * @fmt: protocol format string (see protocol.c) 666 * 667 * Returns request structure (which client must free using p9_req_put) 668 */ 669 670static struct p9_req_t * 671p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 672{ 673 va_list ap; 674 int sigpending, err; 675 unsigned long flags; 676 struct p9_req_t *req; 677 /* Passing zero for tsize/rsize to p9_client_prepare_req() tells it to 678 * auto determine an appropriate (small) request/response size 679 * according to actual message data being sent. Currently RDMA 680 * transport is excluded from this response message size optimization, 681 * as it would not cope with it, due to its pooled response buffers 682 * (using an optimized request size for RDMA as well though). 683 */ 684 const uint tsize = 0; 685 const uint rsize = c->trans_mod->pooled_rbuffers ? c->msize : 0; 686 687 va_start(ap, fmt); 688 req = p9_client_prepare_req(c, type, tsize, rsize, fmt, ap); 689 va_end(ap); 690 if (IS_ERR(req)) 691 return req; 692 693 req->tc.zc = false; 694 req->rc.zc = false; 695 696 if (signal_pending(current)) { 697 sigpending = 1; 698 clear_thread_flag(TIF_SIGPENDING); 699 } else { 700 sigpending = 0; 701 } 702 703 err = c->trans_mod->request(c, req); 704 if (err < 0) { 705 /* write won't happen */ 706 p9_req_put(c, req); 707 if (err != -ERESTARTSYS && err != -EFAULT) 708 c->status = Disconnected; 709 goto recalc_sigpending; 710 } 711again: 712 /* Wait for the response */ 713 err = wait_event_killable(req->wq, 714 READ_ONCE(req->status) >= REQ_STATUS_RCVD); 715 716 /* Make sure our req is coherent with regard to updates in other 717 * threads - echoes to wmb() in the callback 718 */ 719 smp_rmb(); 720 721 if (err == -ERESTARTSYS && c->status == Connected && 722 type == P9_TFLUSH) { 723 sigpending = 1; 724 clear_thread_flag(TIF_SIGPENDING); 725 goto again; 726 } 727 728 if (READ_ONCE(req->status) == REQ_STATUS_ERROR) { 729 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 730 err = req->t_err; 731 } 732 if (err == -ERESTARTSYS && c->status == Connected) { 733 p9_debug(P9_DEBUG_MUX, "flushing\n"); 734 sigpending = 1; 735 clear_thread_flag(TIF_SIGPENDING); 736 737 if (c->trans_mod->cancel(c, req)) 738 p9_client_flush(c, req); 739 740 /* if we received the response anyway, don't signal error */ 741 if (READ_ONCE(req->status) == REQ_STATUS_RCVD) 742 err = 0; 743 } 744recalc_sigpending: 745 if (sigpending) { 746 spin_lock_irqsave(¤t->sighand->siglock, flags); 747 recalc_sigpending(); 748 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 749 } 750 if (err < 0) 751 goto reterr; 752 753 err = p9_check_errors(c, req); 754 trace_9p_client_res(c, type, req->rc.tag, err); 755 if (!err) 756 return req; 757reterr: 758 p9_req_put(c, req); 759 return ERR_PTR(safe_errno(err)); 760} 761 762/** 763 * p9_client_zc_rpc - issue a request and wait for a response 764 * @c: client session 765 * @type: type of request 766 * @uidata: destination for zero copy read 767 * @uodata: source for zero copy write 768 * @inlen: read buffer size 769 * @olen: write buffer size 770 * @in_hdrlen: reader header size, This is the size of response protocol data 771 * @fmt: protocol format string (see protocol.c) 772 * 773 * Returns request structure (which client must free using p9_req_put) 774 */ 775static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 776 struct iov_iter *uidata, 777 struct iov_iter *uodata, 778 int inlen, int olen, int in_hdrlen, 779 const char *fmt, ...) 780{ 781 va_list ap; 782 int sigpending, err; 783 unsigned long flags; 784 struct p9_req_t *req; 785 786 va_start(ap, fmt); 787 /* We allocate a inline protocol data of only 4k bytes. 788 * The actual content is passed in zero-copy fashion. 789 */ 790 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, P9_ZC_HDR_SZ, fmt, ap); 791 va_end(ap); 792 if (IS_ERR(req)) 793 return req; 794 795 req->tc.zc = true; 796 req->rc.zc = true; 797 798 if (signal_pending(current)) { 799 sigpending = 1; 800 clear_thread_flag(TIF_SIGPENDING); 801 } else { 802 sigpending = 0; 803 } 804 805 err = c->trans_mod->zc_request(c, req, uidata, uodata, 806 inlen, olen, in_hdrlen); 807 if (err < 0) { 808 if (err == -EIO) 809 c->status = Disconnected; 810 if (err != -ERESTARTSYS) 811 goto recalc_sigpending; 812 } 813 if (READ_ONCE(req->status) == REQ_STATUS_ERROR) { 814 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 815 err = req->t_err; 816 } 817 if (err == -ERESTARTSYS && c->status == Connected) { 818 p9_debug(P9_DEBUG_MUX, "flushing\n"); 819 sigpending = 1; 820 clear_thread_flag(TIF_SIGPENDING); 821 822 if (c->trans_mod->cancel(c, req)) 823 p9_client_flush(c, req); 824 825 /* if we received the response anyway, don't signal error */ 826 if (READ_ONCE(req->status) == REQ_STATUS_RCVD) 827 err = 0; 828 } 829recalc_sigpending: 830 if (sigpending) { 831 spin_lock_irqsave(¤t->sighand->siglock, flags); 832 recalc_sigpending(); 833 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 834 } 835 if (err < 0) 836 goto reterr; 837 838 err = p9_check_errors(c, req); 839 trace_9p_client_res(c, type, req->rc.tag, err); 840 if (!err) 841 return req; 842reterr: 843 p9_req_put(c, req); 844 return ERR_PTR(safe_errno(err)); 845} 846 847static struct p9_fid *p9_fid_create(struct p9_client *clnt) 848{ 849 int ret; 850 struct p9_fid *fid; 851 852 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 853 fid = kzalloc(sizeof(*fid), GFP_KERNEL); 854 if (!fid) 855 return NULL; 856 857 fid->mode = -1; 858 fid->uid = current_fsuid(); 859 fid->clnt = clnt; 860 refcount_set(&fid->count, 1); 861 862 idr_preload(GFP_KERNEL); 863 spin_lock_irq(&clnt->lock); 864 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, 865 GFP_NOWAIT); 866 spin_unlock_irq(&clnt->lock); 867 idr_preload_end(); 868 if (!ret) { 869 trace_9p_fid_ref(fid, P9_FID_REF_CREATE); 870 return fid; 871 } 872 873 kfree(fid); 874 return NULL; 875} 876 877static void p9_fid_destroy(struct p9_fid *fid) 878{ 879 struct p9_client *clnt; 880 unsigned long flags; 881 882 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 883 trace_9p_fid_ref(fid, P9_FID_REF_DESTROY); 884 clnt = fid->clnt; 885 spin_lock_irqsave(&clnt->lock, flags); 886 idr_remove(&clnt->fids, fid->fid); 887 spin_unlock_irqrestore(&clnt->lock, flags); 888 kfree(fid->rdir); 889 kfree(fid); 890} 891 892/* We also need to export tracepoint symbols for tracepoint_enabled() */ 893EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref); 894 895void do_trace_9p_fid_get(struct p9_fid *fid) 896{ 897 trace_9p_fid_ref(fid, P9_FID_REF_GET); 898} 899EXPORT_SYMBOL(do_trace_9p_fid_get); 900 901void do_trace_9p_fid_put(struct p9_fid *fid) 902{ 903 trace_9p_fid_ref(fid, P9_FID_REF_PUT); 904} 905EXPORT_SYMBOL(do_trace_9p_fid_put); 906 907static int p9_client_version(struct p9_client *c) 908{ 909 int err; 910 struct p9_req_t *req; 911 char *version = NULL; 912 int msize; 913 914 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 915 c->msize, c->proto_version); 916 917 switch (c->proto_version) { 918 case p9_proto_2000L: 919 req = p9_client_rpc(c, P9_TVERSION, "ds", 920 c->msize, "9P2000.L"); 921 break; 922 case p9_proto_2000u: 923 req = p9_client_rpc(c, P9_TVERSION, "ds", 924 c->msize, "9P2000.u"); 925 break; 926 case p9_proto_legacy: 927 req = p9_client_rpc(c, P9_TVERSION, "ds", 928 c->msize, "9P2000"); 929 break; 930 default: 931 return -EINVAL; 932 } 933 934 if (IS_ERR(req)) 935 return PTR_ERR(req); 936 937 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); 938 if (err) { 939 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 940 trace_9p_protocol_dump(c, &req->rc); 941 goto error; 942 } 943 944 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 945 if (!strncmp(version, "9P2000.L", 8)) { 946 c->proto_version = p9_proto_2000L; 947 } else if (!strncmp(version, "9P2000.u", 8)) { 948 c->proto_version = p9_proto_2000u; 949 } else if (!strncmp(version, "9P2000", 6)) { 950 c->proto_version = p9_proto_legacy; 951 } else { 952 p9_debug(P9_DEBUG_ERROR, 953 "server returned an unknown version: %s\n", version); 954 err = -EREMOTEIO; 955 goto error; 956 } 957 958 if (msize < 4096) { 959 p9_debug(P9_DEBUG_ERROR, 960 "server returned a msize < 4096: %d\n", msize); 961 err = -EREMOTEIO; 962 goto error; 963 } 964 if (msize < c->msize) 965 c->msize = msize; 966 967error: 968 kfree(version); 969 p9_req_put(c, req); 970 971 return err; 972} 973 974struct p9_client *p9_client_create(const char *dev_name, char *options) 975{ 976 int err; 977 struct p9_client *clnt; 978 char *client_id; 979 980 clnt = kmalloc(sizeof(*clnt), GFP_KERNEL); 981 if (!clnt) 982 return ERR_PTR(-ENOMEM); 983 984 clnt->trans_mod = NULL; 985 clnt->trans = NULL; 986 clnt->fcall_cache = NULL; 987 988 client_id = utsname()->nodename; 989 memcpy(clnt->name, client_id, strlen(client_id) + 1); 990 991 spin_lock_init(&clnt->lock); 992 idr_init(&clnt->fids); 993 idr_init(&clnt->reqs); 994 995 err = parse_opts(options, clnt); 996 if (err < 0) 997 goto free_client; 998 999 if (!clnt->trans_mod) 1000 clnt->trans_mod = v9fs_get_default_trans(); 1001 1002 if (!clnt->trans_mod) { 1003 err = -EPROTONOSUPPORT; 1004 p9_debug(P9_DEBUG_ERROR, 1005 "No transport defined or default transport\n"); 1006 goto free_client; 1007 } 1008 1009 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1010 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1011 1012 err = clnt->trans_mod->create(clnt, dev_name, options); 1013 if (err) 1014 goto put_trans; 1015 1016 if (clnt->msize > clnt->trans_mod->maxsize) { 1017 clnt->msize = clnt->trans_mod->maxsize; 1018 pr_info("Limiting 'msize' to %d as this is the maximum " 1019 "supported by transport %s\n", 1020 clnt->msize, clnt->trans_mod->name 1021 ); 1022 } 1023 1024 if (clnt->msize < 4096) { 1025 p9_debug(P9_DEBUG_ERROR, 1026 "Please specify a msize of at least 4k\n"); 1027 err = -EINVAL; 1028 goto close_trans; 1029 } 1030 1031 err = p9_client_version(clnt); 1032 if (err) 1033 goto close_trans; 1034 1035 /* P9_HDRSZ + 4 is the smallest packet header we can have that is 1036 * followed by data accessed from userspace by read 1037 */ 1038 clnt->fcall_cache = 1039 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, 1040 0, 0, P9_HDRSZ + 4, 1041 clnt->msize - (P9_HDRSZ + 4), 1042 NULL); 1043 1044 return clnt; 1045 1046close_trans: 1047 clnt->trans_mod->close(clnt); 1048put_trans: 1049 v9fs_put_trans(clnt->trans_mod); 1050free_client: 1051 kfree(clnt); 1052 return ERR_PTR(err); 1053} 1054EXPORT_SYMBOL(p9_client_create); 1055 1056void p9_client_destroy(struct p9_client *clnt) 1057{ 1058 struct p9_fid *fid; 1059 int id; 1060 1061 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1062 1063 if (clnt->trans_mod) 1064 clnt->trans_mod->close(clnt); 1065 1066 v9fs_put_trans(clnt->trans_mod); 1067 1068 idr_for_each_entry(&clnt->fids, fid, id) { 1069 pr_info("Found fid %d not clunked\n", fid->fid); 1070 p9_fid_destroy(fid); 1071 } 1072 1073 p9_tag_cleanup(clnt); 1074 1075 kmem_cache_destroy(clnt->fcall_cache); 1076 kfree(clnt); 1077} 1078EXPORT_SYMBOL(p9_client_destroy); 1079 1080void p9_client_disconnect(struct p9_client *clnt) 1081{ 1082 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1083 clnt->status = Disconnected; 1084} 1085EXPORT_SYMBOL(p9_client_disconnect); 1086 1087void p9_client_begin_disconnect(struct p9_client *clnt) 1088{ 1089 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1090 clnt->status = BeginDisconnect; 1091} 1092EXPORT_SYMBOL(p9_client_begin_disconnect); 1093 1094struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1095 const char *uname, kuid_t n_uname, 1096 const char *aname) 1097{ 1098 int err; 1099 struct p9_req_t *req; 1100 struct p9_fid *fid; 1101 struct p9_qid qid; 1102 1103 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1104 afid ? afid->fid : -1, uname, aname); 1105 fid = p9_fid_create(clnt); 1106 if (!fid) { 1107 err = -ENOMEM; 1108 goto error; 1109 } 1110 fid->uid = n_uname; 1111 1112 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1113 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1114 if (IS_ERR(req)) { 1115 err = PTR_ERR(req); 1116 goto error; 1117 } 1118 1119 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); 1120 if (err) { 1121 trace_9p_protocol_dump(clnt, &req->rc); 1122 p9_req_put(clnt, req); 1123 goto error; 1124 } 1125 1126 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1127 qid.type, qid.path, qid.version); 1128 1129 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1130 1131 p9_req_put(clnt, req); 1132 return fid; 1133 1134error: 1135 if (fid) 1136 p9_fid_destroy(fid); 1137 return ERR_PTR(err); 1138} 1139EXPORT_SYMBOL(p9_client_attach); 1140 1141struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1142 const unsigned char * const *wnames, int clone) 1143{ 1144 int err; 1145 struct p9_client *clnt; 1146 struct p9_fid *fid; 1147 struct p9_qid *wqids; 1148 struct p9_req_t *req; 1149 u16 nwqids, count; 1150 1151 wqids = NULL; 1152 clnt = oldfid->clnt; 1153 if (clone) { 1154 fid = p9_fid_create(clnt); 1155 if (!fid) { 1156 err = -ENOMEM; 1157 goto error; 1158 } 1159 1160 fid->uid = oldfid->uid; 1161 } else { 1162 fid = oldfid; 1163 } 1164 1165 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1166 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1167 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1168 nwname, wnames); 1169 if (IS_ERR(req)) { 1170 err = PTR_ERR(req); 1171 goto error; 1172 } 1173 1174 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1175 if (err) { 1176 trace_9p_protocol_dump(clnt, &req->rc); 1177 p9_req_put(clnt, req); 1178 goto clunk_fid; 1179 } 1180 p9_req_put(clnt, req); 1181 1182 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1183 1184 if (nwqids != nwname) { 1185 err = -ENOENT; 1186 goto clunk_fid; 1187 } 1188 1189 for (count = 0; count < nwqids; count++) 1190 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1191 count, wqids[count].type, 1192 wqids[count].path, 1193 wqids[count].version); 1194 1195 if (nwname) 1196 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1197 else 1198 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); 1199 1200 kfree(wqids); 1201 return fid; 1202 1203clunk_fid: 1204 kfree(wqids); 1205 p9_fid_put(fid); 1206 fid = NULL; 1207 1208error: 1209 if (fid && fid != oldfid) 1210 p9_fid_destroy(fid); 1211 1212 return ERR_PTR(err); 1213} 1214EXPORT_SYMBOL(p9_client_walk); 1215 1216int p9_client_open(struct p9_fid *fid, int mode) 1217{ 1218 int err; 1219 struct p9_client *clnt; 1220 struct p9_req_t *req; 1221 struct p9_qid qid; 1222 int iounit; 1223 1224 clnt = fid->clnt; 1225 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1226 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1227 1228 if (fid->mode != -1) 1229 return -EINVAL; 1230 1231 if (p9_is_proto_dotl(clnt)) 1232 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode & P9L_MODE_MASK); 1233 else 1234 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode & P9L_MODE_MASK); 1235 if (IS_ERR(req)) { 1236 err = PTR_ERR(req); 1237 goto error; 1238 } 1239 1240 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1241 if (err) { 1242 trace_9p_protocol_dump(clnt, &req->rc); 1243 goto free_and_error; 1244 } 1245 1246 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1247 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1248 qid.path, qid.version, iounit); 1249 1250 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1251 fid->mode = mode; 1252 fid->iounit = iounit; 1253 1254free_and_error: 1255 p9_req_put(clnt, req); 1256error: 1257 return err; 1258} 1259EXPORT_SYMBOL(p9_client_open); 1260 1261int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, 1262 u32 mode, kgid_t gid, struct p9_qid *qid) 1263{ 1264 int err; 1265 struct p9_client *clnt; 1266 struct p9_req_t *req; 1267 int iounit; 1268 1269 p9_debug(P9_DEBUG_9P, 1270 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1271 ofid->fid, name, flags, mode, 1272 from_kgid(&init_user_ns, gid)); 1273 clnt = ofid->clnt; 1274 1275 if (ofid->mode != -1) 1276 return -EINVAL; 1277 1278 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1279 mode & P9L_MODE_MASK, gid); 1280 if (IS_ERR(req)) { 1281 err = PTR_ERR(req); 1282 goto error; 1283 } 1284 1285 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); 1286 if (err) { 1287 trace_9p_protocol_dump(clnt, &req->rc); 1288 goto free_and_error; 1289 } 1290 1291 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1292 qid->type, qid->path, qid->version, iounit); 1293 1294 memmove(&ofid->qid, qid, sizeof(struct p9_qid)); 1295 ofid->mode = flags; 1296 ofid->iounit = iounit; 1297 1298free_and_error: 1299 p9_req_put(clnt, req); 1300error: 1301 return err; 1302} 1303EXPORT_SYMBOL(p9_client_create_dotl); 1304 1305int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1306 char *extension) 1307{ 1308 int err; 1309 struct p9_client *clnt; 1310 struct p9_req_t *req; 1311 struct p9_qid qid; 1312 int iounit; 1313 1314 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1315 fid->fid, name, perm, mode); 1316 clnt = fid->clnt; 1317 1318 if (fid->mode != -1) 1319 return -EINVAL; 1320 1321 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1322 mode & P9L_MODE_MASK, extension); 1323 if (IS_ERR(req)) { 1324 err = PTR_ERR(req); 1325 goto error; 1326 } 1327 1328 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1329 if (err) { 1330 trace_9p_protocol_dump(clnt, &req->rc); 1331 goto free_and_error; 1332 } 1333 1334 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1335 qid.type, qid.path, qid.version, iounit); 1336 1337 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1338 fid->mode = mode; 1339 fid->iounit = iounit; 1340 1341free_and_error: 1342 p9_req_put(clnt, req); 1343error: 1344 return err; 1345} 1346EXPORT_SYMBOL(p9_client_fcreate); 1347 1348int p9_client_symlink(struct p9_fid *dfid, const char *name, 1349 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1350{ 1351 int err; 1352 struct p9_client *clnt; 1353 struct p9_req_t *req; 1354 1355 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1356 dfid->fid, name, symtgt); 1357 clnt = dfid->clnt; 1358 1359 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1360 gid); 1361 if (IS_ERR(req)) { 1362 err = PTR_ERR(req); 1363 goto error; 1364 } 1365 1366 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 1367 if (err) { 1368 trace_9p_protocol_dump(clnt, &req->rc); 1369 goto free_and_error; 1370 } 1371 1372 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1373 qid->type, qid->path, qid->version); 1374 1375free_and_error: 1376 p9_req_put(clnt, req); 1377error: 1378 return err; 1379} 1380EXPORT_SYMBOL(p9_client_symlink); 1381 1382int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1383{ 1384 struct p9_client *clnt; 1385 struct p9_req_t *req; 1386 1387 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1388 dfid->fid, oldfid->fid, newname); 1389 clnt = dfid->clnt; 1390 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1391 newname); 1392 if (IS_ERR(req)) 1393 return PTR_ERR(req); 1394 1395 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1396 p9_req_put(clnt, req); 1397 return 0; 1398} 1399EXPORT_SYMBOL(p9_client_link); 1400 1401int p9_client_fsync(struct p9_fid *fid, int datasync) 1402{ 1403 int err = 0; 1404 struct p9_client *clnt; 1405 struct p9_req_t *req; 1406 1407 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1408 fid->fid, datasync); 1409 clnt = fid->clnt; 1410 1411 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1412 if (IS_ERR(req)) { 1413 err = PTR_ERR(req); 1414 goto error; 1415 } 1416 1417 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1418 1419 p9_req_put(clnt, req); 1420 1421error: 1422 return err; 1423} 1424EXPORT_SYMBOL(p9_client_fsync); 1425 1426int p9_client_clunk(struct p9_fid *fid) 1427{ 1428 int err = 0; 1429 struct p9_client *clnt; 1430 struct p9_req_t *req; 1431 int retries = 0; 1432 1433again: 1434 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", 1435 fid->fid, retries); 1436 clnt = fid->clnt; 1437 1438 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1439 if (IS_ERR(req)) { 1440 err = PTR_ERR(req); 1441 goto error; 1442 } 1443 1444 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1445 1446 p9_req_put(clnt, req); 1447error: 1448 /* Fid is not valid even after a failed clunk 1449 * If interrupted, retry once then give up and 1450 * leak fid until umount. 1451 */ 1452 if (err == -ERESTARTSYS) { 1453 if (retries++ == 0) 1454 goto again; 1455 } else { 1456 p9_fid_destroy(fid); 1457 } 1458 return err; 1459} 1460EXPORT_SYMBOL(p9_client_clunk); 1461 1462int p9_client_remove(struct p9_fid *fid) 1463{ 1464 int err = 0; 1465 struct p9_client *clnt; 1466 struct p9_req_t *req; 1467 1468 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1469 clnt = fid->clnt; 1470 1471 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1472 if (IS_ERR(req)) { 1473 err = PTR_ERR(req); 1474 goto error; 1475 } 1476 1477 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1478 1479 p9_req_put(clnt, req); 1480error: 1481 if (err == -ERESTARTSYS) 1482 p9_fid_put(fid); 1483 else 1484 p9_fid_destroy(fid); 1485 return err; 1486} 1487EXPORT_SYMBOL(p9_client_remove); 1488 1489int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1490{ 1491 int err = 0; 1492 struct p9_req_t *req; 1493 struct p9_client *clnt; 1494 1495 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1496 dfid->fid, name, flags); 1497 1498 clnt = dfid->clnt; 1499 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1500 if (IS_ERR(req)) { 1501 err = PTR_ERR(req); 1502 goto error; 1503 } 1504 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1505 1506 p9_req_put(clnt, req); 1507error: 1508 return err; 1509} 1510EXPORT_SYMBOL(p9_client_unlinkat); 1511 1512int 1513p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1514{ 1515 int total = 0; 1516 *err = 0; 1517 1518 while (iov_iter_count(to)) { 1519 int count; 1520 1521 count = p9_client_read_once(fid, offset, to, err); 1522 if (!count || *err) 1523 break; 1524 offset += count; 1525 total += count; 1526 } 1527 return total; 1528} 1529EXPORT_SYMBOL(p9_client_read); 1530 1531int 1532p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, 1533 int *err) 1534{ 1535 struct p9_client *clnt = fid->clnt; 1536 struct p9_req_t *req; 1537 int count = iov_iter_count(to); 1538 int rsize, received, non_zc = 0; 1539 char *dataptr; 1540 1541 *err = 0; 1542 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n", 1543 fid->fid, offset, iov_iter_count(to)); 1544 1545 rsize = fid->iounit; 1546 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1547 rsize = clnt->msize - P9_IOHDRSZ; 1548 1549 if (count < rsize) 1550 rsize = count; 1551 1552 /* Don't bother zerocopy for small IO (< 1024) */ 1553 if (clnt->trans_mod->zc_request && rsize > 1024) { 1554 /* response header len is 11 1555 * PDU Header(7) + IO Size (4) 1556 */ 1557 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1558 0, 11, "dqd", fid->fid, 1559 offset, rsize); 1560 } else { 1561 non_zc = 1; 1562 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1563 rsize); 1564 } 1565 if (IS_ERR(req)) { 1566 *err = PTR_ERR(req); 1567 if (!non_zc) 1568 iov_iter_revert(to, count - iov_iter_count(to)); 1569 return 0; 1570 } 1571 1572 *err = p9pdu_readf(&req->rc, clnt->proto_version, 1573 "D", &received, &dataptr); 1574 if (*err) { 1575 if (!non_zc) 1576 iov_iter_revert(to, count - iov_iter_count(to)); 1577 trace_9p_protocol_dump(clnt, &req->rc); 1578 p9_req_put(clnt, req); 1579 return 0; 1580 } 1581 if (rsize < received) { 1582 pr_err("bogus RREAD count (%d > %d)\n", received, rsize); 1583 received = rsize; 1584 } 1585 1586 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", received); 1587 1588 if (non_zc) { 1589 int n = copy_to_iter(dataptr, received, to); 1590 1591 if (n != received) { 1592 *err = -EFAULT; 1593 p9_req_put(clnt, req); 1594 return n; 1595 } 1596 } else { 1597 iov_iter_revert(to, count - received - iov_iter_count(to)); 1598 } 1599 p9_req_put(clnt, req); 1600 return received; 1601} 1602EXPORT_SYMBOL(p9_client_read_once); 1603 1604int 1605p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1606{ 1607 struct p9_client *clnt = fid->clnt; 1608 struct p9_req_t *req; 1609 int total = 0; 1610 *err = 0; 1611 1612 while (iov_iter_count(from)) { 1613 int count = iov_iter_count(from); 1614 int rsize = fid->iounit; 1615 int written; 1616 1617 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1618 rsize = clnt->msize - P9_IOHDRSZ; 1619 1620 if (count < rsize) 1621 rsize = count; 1622 1623 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d (/%d)\n", 1624 fid->fid, offset, rsize, count); 1625 1626 /* Don't bother zerocopy for small IO (< 1024) */ 1627 if (clnt->trans_mod->zc_request && rsize > 1024) { 1628 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1629 rsize, P9_ZC_HDR_SZ, "dqd", 1630 fid->fid, offset, rsize); 1631 } else { 1632 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1633 offset, rsize, from); 1634 } 1635 if (IS_ERR(req)) { 1636 iov_iter_revert(from, count - iov_iter_count(from)); 1637 *err = PTR_ERR(req); 1638 break; 1639 } 1640 1641 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written); 1642 if (*err) { 1643 iov_iter_revert(from, count - iov_iter_count(from)); 1644 trace_9p_protocol_dump(clnt, &req->rc); 1645 p9_req_put(clnt, req); 1646 break; 1647 } 1648 if (rsize < written) { 1649 pr_err("bogus RWRITE count (%d > %d)\n", written, rsize); 1650 written = rsize; 1651 } 1652 1653 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", written); 1654 1655 p9_req_put(clnt, req); 1656 iov_iter_revert(from, count - written - iov_iter_count(from)); 1657 total += written; 1658 offset += written; 1659 } 1660 return total; 1661} 1662EXPORT_SYMBOL(p9_client_write); 1663 1664struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1665{ 1666 int err; 1667 struct p9_client *clnt; 1668 struct p9_wstat *ret; 1669 struct p9_req_t *req; 1670 u16 ignored; 1671 1672 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1673 1674 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1675 if (!ret) 1676 return ERR_PTR(-ENOMEM); 1677 1678 clnt = fid->clnt; 1679 1680 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1681 if (IS_ERR(req)) { 1682 err = PTR_ERR(req); 1683 goto error; 1684 } 1685 1686 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); 1687 if (err) { 1688 trace_9p_protocol_dump(clnt, &req->rc); 1689 p9_req_put(clnt, req); 1690 goto error; 1691 } 1692 1693 p9_debug(P9_DEBUG_9P, 1694 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1695 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1696 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1697 "<<< uid=%d gid=%d n_muid=%d\n", 1698 ret->size, ret->type, ret->dev, ret->qid.type, ret->qid.path, 1699 ret->qid.version, ret->mode, 1700 ret->atime, ret->mtime, ret->length, 1701 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1702 from_kuid(&init_user_ns, ret->n_uid), 1703 from_kgid(&init_user_ns, ret->n_gid), 1704 from_kuid(&init_user_ns, ret->n_muid)); 1705 1706 p9_req_put(clnt, req); 1707 return ret; 1708 1709error: 1710 kfree(ret); 1711 return ERR_PTR(err); 1712} 1713EXPORT_SYMBOL(p9_client_stat); 1714 1715struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1716 u64 request_mask) 1717{ 1718 int err; 1719 struct p9_client *clnt; 1720 struct p9_stat_dotl *ret; 1721 struct p9_req_t *req; 1722 1723 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1724 fid->fid, request_mask); 1725 1726 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1727 if (!ret) 1728 return ERR_PTR(-ENOMEM); 1729 1730 clnt = fid->clnt; 1731 1732 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1733 if (IS_ERR(req)) { 1734 err = PTR_ERR(req); 1735 goto error; 1736 } 1737 1738 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); 1739 if (err) { 1740 trace_9p_protocol_dump(clnt, &req->rc); 1741 p9_req_put(clnt, req); 1742 goto error; 1743 } 1744 1745 p9_debug(P9_DEBUG_9P, "<<< RGETATTR st_result_mask=%lld\n" 1746 "<<< qid=%x.%llx.%x\n" 1747 "<<< st_mode=%8.8x st_nlink=%llu\n" 1748 "<<< st_uid=%d st_gid=%d\n" 1749 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1750 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1751 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1752 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1753 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1754 "<<< st_gen=%lld st_data_version=%lld\n", 1755 ret->st_result_mask, 1756 ret->qid.type, ret->qid.path, ret->qid.version, 1757 ret->st_mode, ret->st_nlink, 1758 from_kuid(&init_user_ns, ret->st_uid), 1759 from_kgid(&init_user_ns, ret->st_gid), 1760 ret->st_rdev, ret->st_size, ret->st_blksize, ret->st_blocks, 1761 ret->st_atime_sec, ret->st_atime_nsec, 1762 ret->st_mtime_sec, ret->st_mtime_nsec, 1763 ret->st_ctime_sec, ret->st_ctime_nsec, 1764 ret->st_btime_sec, ret->st_btime_nsec, 1765 ret->st_gen, ret->st_data_version); 1766 1767 p9_req_put(clnt, req); 1768 return ret; 1769 1770error: 1771 kfree(ret); 1772 return ERR_PTR(err); 1773} 1774EXPORT_SYMBOL(p9_client_getattr_dotl); 1775 1776static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1777{ 1778 int ret; 1779 1780 /* NOTE: size shouldn't include its own length */ 1781 /* size[2] type[2] dev[4] qid[13] */ 1782 /* mode[4] atime[4] mtime[4] length[8]*/ 1783 /* name[s] uid[s] gid[s] muid[s] */ 1784 ret = 2 + 4 + 13 + 4 + 4 + 4 + 8 + 2 + 2 + 2 + 2; 1785 1786 if (wst->name) 1787 ret += strlen(wst->name); 1788 if (wst->uid) 1789 ret += strlen(wst->uid); 1790 if (wst->gid) 1791 ret += strlen(wst->gid); 1792 if (wst->muid) 1793 ret += strlen(wst->muid); 1794 1795 if (proto_version == p9_proto_2000u || 1796 proto_version == p9_proto_2000L) { 1797 /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1798 ret += 2 + 4 + 4 + 4; 1799 if (wst->extension) 1800 ret += strlen(wst->extension); 1801 } 1802 1803 return ret; 1804} 1805 1806int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1807{ 1808 int err = 0; 1809 struct p9_req_t *req; 1810 struct p9_client *clnt; 1811 1812 clnt = fid->clnt; 1813 wst->size = p9_client_statsize(wst, clnt->proto_version); 1814 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", 1815 fid->fid); 1816 p9_debug(P9_DEBUG_9P, 1817 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1818 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1819 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1820 " uid=%d gid=%d n_muid=%d\n", 1821 wst->size, wst->type, wst->dev, wst->qid.type, 1822 wst->qid.path, wst->qid.version, 1823 wst->mode, wst->atime, wst->mtime, wst->length, 1824 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1825 from_kuid(&init_user_ns, wst->n_uid), 1826 from_kgid(&init_user_ns, wst->n_gid), 1827 from_kuid(&init_user_ns, wst->n_muid)); 1828 1829 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", 1830 fid->fid, wst->size + 2, wst); 1831 if (IS_ERR(req)) { 1832 err = PTR_ERR(req); 1833 goto error; 1834 } 1835 1836 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1837 1838 p9_req_put(clnt, req); 1839error: 1840 return err; 1841} 1842EXPORT_SYMBOL(p9_client_wstat); 1843 1844int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1845{ 1846 int err = 0; 1847 struct p9_req_t *req; 1848 struct p9_client *clnt; 1849 1850 clnt = fid->clnt; 1851 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1852 p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n", 1853 p9attr->valid, p9attr->mode, 1854 from_kuid(&init_user_ns, p9attr->uid), 1855 from_kgid(&init_user_ns, p9attr->gid), 1856 p9attr->size); 1857 p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n", 1858 p9attr->atime_sec, p9attr->atime_nsec); 1859 p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n", 1860 p9attr->mtime_sec, p9attr->mtime_nsec); 1861 1862 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1863 1864 if (IS_ERR(req)) { 1865 err = PTR_ERR(req); 1866 goto error; 1867 } 1868 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1869 p9_req_put(clnt, req); 1870error: 1871 return err; 1872} 1873EXPORT_SYMBOL(p9_client_setattr); 1874 1875int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1876{ 1877 int err; 1878 struct p9_req_t *req; 1879 struct p9_client *clnt; 1880 1881 clnt = fid->clnt; 1882 1883 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1884 1885 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1886 if (IS_ERR(req)) { 1887 err = PTR_ERR(req); 1888 goto error; 1889 } 1890 1891 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1892 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1893 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1894 if (err) { 1895 trace_9p_protocol_dump(clnt, &req->rc); 1896 p9_req_put(clnt, req); 1897 goto error; 1898 } 1899 1900 p9_debug(P9_DEBUG_9P, 1901 "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n", 1902 fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree, 1903 sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen); 1904 1905 p9_req_put(clnt, req); 1906error: 1907 return err; 1908} 1909EXPORT_SYMBOL(p9_client_statfs); 1910 1911int p9_client_rename(struct p9_fid *fid, 1912 struct p9_fid *newdirfid, const char *name) 1913{ 1914 int err = 0; 1915 struct p9_req_t *req; 1916 struct p9_client *clnt; 1917 1918 clnt = fid->clnt; 1919 1920 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1921 fid->fid, newdirfid->fid, name); 1922 1923 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1924 newdirfid->fid, name); 1925 if (IS_ERR(req)) { 1926 err = PTR_ERR(req); 1927 goto error; 1928 } 1929 1930 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1931 1932 p9_req_put(clnt, req); 1933error: 1934 return err; 1935} 1936EXPORT_SYMBOL(p9_client_rename); 1937 1938int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1939 struct p9_fid *newdirfid, const char *new_name) 1940{ 1941 int err = 0; 1942 struct p9_req_t *req; 1943 struct p9_client *clnt; 1944 1945 clnt = olddirfid->clnt; 1946 1947 p9_debug(P9_DEBUG_9P, 1948 ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n", 1949 olddirfid->fid, old_name, newdirfid->fid, new_name); 1950 1951 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1952 old_name, newdirfid->fid, new_name); 1953 if (IS_ERR(req)) { 1954 err = PTR_ERR(req); 1955 goto error; 1956 } 1957 1958 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1959 newdirfid->fid, new_name); 1960 1961 p9_req_put(clnt, req); 1962error: 1963 return err; 1964} 1965EXPORT_SYMBOL(p9_client_renameat); 1966 1967/* An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1968 */ 1969struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1970 const char *attr_name, u64 *attr_size) 1971{ 1972 int err; 1973 struct p9_req_t *req; 1974 struct p9_client *clnt; 1975 struct p9_fid *attr_fid; 1976 1977 clnt = file_fid->clnt; 1978 attr_fid = p9_fid_create(clnt); 1979 if (!attr_fid) { 1980 err = -ENOMEM; 1981 goto error; 1982 } 1983 p9_debug(P9_DEBUG_9P, 1984 ">>> TXATTRWALK file_fid %d, attr_fid %d name '%s'\n", 1985 file_fid->fid, attr_fid->fid, attr_name); 1986 1987 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 1988 file_fid->fid, attr_fid->fid, attr_name); 1989 if (IS_ERR(req)) { 1990 err = PTR_ERR(req); 1991 goto error; 1992 } 1993 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); 1994 if (err) { 1995 trace_9p_protocol_dump(clnt, &req->rc); 1996 p9_req_put(clnt, req); 1997 goto clunk_fid; 1998 } 1999 p9_req_put(clnt, req); 2000 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2001 attr_fid->fid, *attr_size); 2002 return attr_fid; 2003clunk_fid: 2004 p9_fid_put(attr_fid); 2005 attr_fid = NULL; 2006error: 2007 if (attr_fid && attr_fid != file_fid) 2008 p9_fid_destroy(attr_fid); 2009 2010 return ERR_PTR(err); 2011} 2012EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2013 2014int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2015 u64 attr_size, int flags) 2016{ 2017 int err = 0; 2018 struct p9_req_t *req; 2019 struct p9_client *clnt; 2020 2021 p9_debug(P9_DEBUG_9P, 2022 ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n", 2023 fid->fid, name, attr_size, flags); 2024 clnt = fid->clnt; 2025 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2026 fid->fid, name, attr_size, flags); 2027 if (IS_ERR(req)) { 2028 err = PTR_ERR(req); 2029 goto error; 2030 } 2031 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2032 p9_req_put(clnt, req); 2033error: 2034 return err; 2035} 2036EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2037 2038int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2039{ 2040 int err, rsize, non_zc = 0; 2041 struct p9_client *clnt; 2042 struct p9_req_t *req; 2043 char *dataptr; 2044 struct kvec kv = {.iov_base = data, .iov_len = count}; 2045 struct iov_iter to; 2046 2047 iov_iter_kvec(&to, ITER_DEST, &kv, 1, count); 2048 2049 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2050 fid->fid, offset, count); 2051 2052 clnt = fid->clnt; 2053 2054 rsize = fid->iounit; 2055 if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ) 2056 rsize = clnt->msize - P9_READDIRHDRSZ; 2057 2058 if (count < rsize) 2059 rsize = count; 2060 2061 /* Don't bother zerocopy for small IO (< 1024) */ 2062 if (clnt->trans_mod->zc_request && rsize > 1024) { 2063 /* response header len is 11 2064 * PDU Header(7) + IO Size (4) 2065 */ 2066 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2067 11, "dqd", fid->fid, offset, rsize); 2068 } else { 2069 non_zc = 1; 2070 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2071 offset, rsize); 2072 } 2073 if (IS_ERR(req)) { 2074 err = PTR_ERR(req); 2075 goto error; 2076 } 2077 2078 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); 2079 if (err) { 2080 trace_9p_protocol_dump(clnt, &req->rc); 2081 goto free_and_error; 2082 } 2083 if (rsize < count) { 2084 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2085 count = rsize; 2086 } 2087 2088 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2089 2090 if (non_zc) 2091 memmove(data, dataptr, count); 2092 2093 p9_req_put(clnt, req); 2094 return count; 2095 2096free_and_error: 2097 p9_req_put(clnt, req); 2098error: 2099 return err; 2100} 2101EXPORT_SYMBOL(p9_client_readdir); 2102 2103int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2104 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2105{ 2106 int err; 2107 struct p9_client *clnt; 2108 struct p9_req_t *req; 2109 2110 clnt = fid->clnt; 2111 p9_debug(P9_DEBUG_9P, 2112 ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n", 2113 fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2114 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2115 MAJOR(rdev), MINOR(rdev), gid); 2116 if (IS_ERR(req)) 2117 return PTR_ERR(req); 2118 2119 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2120 if (err) { 2121 trace_9p_protocol_dump(clnt, &req->rc); 2122 goto error; 2123 } 2124 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", 2125 qid->type, qid->path, qid->version); 2126 2127error: 2128 p9_req_put(clnt, req); 2129 return err; 2130} 2131EXPORT_SYMBOL(p9_client_mknod_dotl); 2132 2133int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2134 kgid_t gid, struct p9_qid *qid) 2135{ 2136 int err; 2137 struct p9_client *clnt; 2138 struct p9_req_t *req; 2139 2140 clnt = fid->clnt; 2141 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2142 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2143 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", 2144 fid->fid, name, mode, gid); 2145 if (IS_ERR(req)) 2146 return PTR_ERR(req); 2147 2148 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2149 if (err) { 2150 trace_9p_protocol_dump(clnt, &req->rc); 2151 goto error; 2152 } 2153 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2154 qid->path, qid->version); 2155 2156error: 2157 p9_req_put(clnt, req); 2158 return err; 2159} 2160EXPORT_SYMBOL(p9_client_mkdir_dotl); 2161 2162int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2163{ 2164 int err; 2165 struct p9_client *clnt; 2166 struct p9_req_t *req; 2167 2168 clnt = fid->clnt; 2169 p9_debug(P9_DEBUG_9P, 2170 ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n", 2171 fid->fid, flock->type, flock->flags, flock->start, 2172 flock->length, flock->proc_id, flock->client_id); 2173 2174 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2175 flock->flags, flock->start, flock->length, 2176 flock->proc_id, flock->client_id); 2177 2178 if (IS_ERR(req)) 2179 return PTR_ERR(req); 2180 2181 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); 2182 if (err) { 2183 trace_9p_protocol_dump(clnt, &req->rc); 2184 goto error; 2185 } 2186 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2187error: 2188 p9_req_put(clnt, req); 2189 return err; 2190} 2191EXPORT_SYMBOL(p9_client_lock_dotl); 2192 2193int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2194{ 2195 int err; 2196 struct p9_client *clnt; 2197 struct p9_req_t *req; 2198 2199 clnt = fid->clnt; 2200 p9_debug(P9_DEBUG_9P, 2201 ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n", 2202 fid->fid, glock->type, glock->start, glock->length, 2203 glock->proc_id, glock->client_id); 2204 2205 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, 2206 glock->type, glock->start, glock->length, 2207 glock->proc_id, glock->client_id); 2208 2209 if (IS_ERR(req)) 2210 return PTR_ERR(req); 2211 2212 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, 2213 &glock->start, &glock->length, &glock->proc_id, 2214 &glock->client_id); 2215 if (err) { 2216 trace_9p_protocol_dump(clnt, &req->rc); 2217 goto error; 2218 } 2219 p9_debug(P9_DEBUG_9P, 2220 "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n", 2221 glock->type, glock->start, glock->length, 2222 glock->proc_id, glock->client_id); 2223error: 2224 p9_req_put(clnt, req); 2225 return err; 2226} 2227EXPORT_SYMBOL(p9_client_getlock_dotl); 2228 2229int p9_client_readlink(struct p9_fid *fid, char **target) 2230{ 2231 int err; 2232 struct p9_client *clnt; 2233 struct p9_req_t *req; 2234 2235 clnt = fid->clnt; 2236 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2237 2238 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2239 if (IS_ERR(req)) 2240 return PTR_ERR(req); 2241 2242 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); 2243 if (err) { 2244 trace_9p_protocol_dump(clnt, &req->rc); 2245 goto error; 2246 } 2247 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2248error: 2249 p9_req_put(clnt, req); 2250 return err; 2251} 2252EXPORT_SYMBOL(p9_client_readlink); 2253 2254int __init p9_client_init(void) 2255{ 2256 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); 2257 return p9_req_cache ? 0 : -ENOMEM; 2258} 2259 2260void __exit p9_client_exit(void) 2261{ 2262 kmem_cache_destroy(p9_req_cache); 2263} 2264