1 /* 2 * net/9p/clnt.c 3 * 4 * 9P Client 5 * 6 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> 7 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 11 * as published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to: 20 * Free Software Foundation 21 * 51 Franklin Street, Fifth Floor 22 * Boston, MA 02111-1301 USA 23 * 24 */ 25 26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 27 28 #include <linux/module.h> 29 #include <linux/errno.h> 30 #include <linux/fs.h> 31 #include <linux/poll.h> 32 #include <linux/idr.h> 33 #include <linux/mutex.h> 34 #include <linux/slab.h> 35 #include <linux/sched/signal.h> 36 #include <linux/uaccess.h> 37 #include <linux/uio.h> 38 #include <net/9p/9p.h> 39 #include <linux/parser.h> 40 #include <linux/seq_file.h> 41 #include <net/9p/client.h> 42 #include <net/9p/transport.h> 43 #include "protocol.h" 44 45 #define CREATE_TRACE_POINTS 46 #include <trace/events/9p.h> 47 48 /* 49 * Client Option Parsing (code inspired by NFS code) 50 * - a little lazy - parse all client options 51 */ 52 53 enum { 54 Opt_msize, 55 Opt_trans, 56 Opt_legacy, 57 Opt_version, 58 Opt_err, 59 }; 60 61 static const match_table_t tokens = { 62 {Opt_msize, "msize=%u"}, 63 {Opt_legacy, "noextend"}, 64 {Opt_trans, "trans=%s"}, 65 {Opt_version, "version=%s"}, 66 {Opt_err, NULL}, 67 }; 68 69 inline int p9_is_proto_dotl(struct p9_client *clnt) 70 { 71 return clnt->proto_version == p9_proto_2000L; 72 } 73 EXPORT_SYMBOL(p9_is_proto_dotl); 74 75 inline int p9_is_proto_dotu(struct p9_client *clnt) 76 { 77 return clnt->proto_version == p9_proto_2000u; 78 } 79 EXPORT_SYMBOL(p9_is_proto_dotu); 80 81 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt) 82 { 83 if (clnt->msize != 8192) 84 seq_printf(m, ",msize=%u", clnt->msize); 85 seq_printf(m, ",trans=%s", clnt->trans_mod->name); 86 87 switch (clnt->proto_version) { 88 case p9_proto_legacy: 89 seq_puts(m, ",noextend"); 90 break; 91 case p9_proto_2000u: 92 seq_puts(m, ",version=9p2000.u"); 93 break; 94 case p9_proto_2000L: 95 /* Default */ 96 break; 97 } 98 99 if (clnt->trans_mod->show_options) 100 return clnt->trans_mod->show_options(m, clnt); 101 return 0; 102 } 103 EXPORT_SYMBOL(p9_show_client_options); 104 105 /* 106 * Some error codes are taken directly from the server replies, 107 * make sure they are valid. 108 */ 109 static int safe_errno(int err) 110 { 111 if ((err > 0) || (err < -MAX_ERRNO)) { 112 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err); 113 return -EPROTO; 114 } 115 return err; 116 } 117 118 119 /* Interpret mount option for protocol version */ 120 static int get_protocol_version(char *s) 121 { 122 int version = -EINVAL; 123 124 if (!strcmp(s, "9p2000")) { 125 version = p9_proto_legacy; 126 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n"); 127 } else if (!strcmp(s, "9p2000.u")) { 128 version = p9_proto_2000u; 129 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); 130 } else if (!strcmp(s, "9p2000.L")) { 131 version = p9_proto_2000L; 132 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); 133 } else 134 pr_info("Unknown protocol version %s\n", s); 135 136 return version; 137 } 138 139 /** 140 * parse_options - parse mount options into client structure 141 * @opts: options string passed from mount 142 * @clnt: existing v9fs client information 143 * 144 * Return 0 upon success, -ERRNO upon failure 145 */ 146 147 static int parse_opts(char *opts, struct p9_client *clnt) 148 { 149 char *options, *tmp_options; 150 char *p; 151 substring_t args[MAX_OPT_ARGS]; 152 int option; 153 char *s; 154 int ret = 0; 155 156 clnt->proto_version = p9_proto_2000L; 157 clnt->msize = 8192; 158 159 if (!opts) 160 return 0; 161 162 tmp_options = kstrdup(opts, GFP_KERNEL); 163 if (!tmp_options) { 164 p9_debug(P9_DEBUG_ERROR, 165 "failed to allocate copy of option string\n"); 166 return -ENOMEM; 167 } 168 options = tmp_options; 169 170 while ((p = strsep(&options, ",")) != NULL) { 171 int token, r; 172 if (!*p) 173 continue; 174 token = match_token(p, tokens, args); 175 switch (token) { 176 case Opt_msize: 177 r = match_int(&args[0], &option); 178 if (r < 0) { 179 p9_debug(P9_DEBUG_ERROR, 180 "integer field, but no integer?\n"); 181 ret = r; 182 continue; 183 } 184 clnt->msize = option; 185 break; 186 case Opt_trans: 187 s = match_strdup(&args[0]); 188 if (!s) { 189 ret = -ENOMEM; 190 p9_debug(P9_DEBUG_ERROR, 191 "problem allocating copy of trans arg\n"); 192 goto free_and_return; 193 } 194 195 v9fs_put_trans(clnt->trans_mod); 196 clnt->trans_mod = v9fs_get_trans_by_name(s); 197 if (clnt->trans_mod == NULL) { 198 pr_info("Could not find request transport: %s\n", 199 s); 200 ret = -EINVAL; 201 } 202 kfree(s); 203 break; 204 case Opt_legacy: 205 clnt->proto_version = p9_proto_legacy; 206 break; 207 case Opt_version: 208 s = match_strdup(&args[0]); 209 if (!s) { 210 ret = -ENOMEM; 211 p9_debug(P9_DEBUG_ERROR, 212 "problem allocating copy of version arg\n"); 213 goto free_and_return; 214 } 215 r = get_protocol_version(s); 216 if (r < 0) 217 ret = r; 218 else 219 clnt->proto_version = r; 220 kfree(s); 221 break; 222 default: 223 continue; 224 } 225 } 226 227 free_and_return: 228 if (ret) 229 v9fs_put_trans(clnt->trans_mod); 230 kfree(tmp_options); 231 return ret; 232 } 233 234 static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc, 235 int alloc_msize) 236 { 237 if (likely(c->fcall_cache) && alloc_msize == c->msize) { 238 fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS); 239 fc->cache = c->fcall_cache; 240 } else { 241 fc->sdata = kmalloc(alloc_msize, GFP_NOFS); 242 fc->cache = NULL; 243 } 244 if (!fc->sdata) 245 return -ENOMEM; 246 fc->capacity = alloc_msize; 247 return 0; 248 } 249 250 void p9_fcall_fini(struct p9_fcall *fc) 251 { 252 /* sdata can be NULL for interrupted requests in trans_rdma, 253 * and kmem_cache_free does not do NULL-check for us 254 */ 255 if (unlikely(!fc->sdata)) 256 return; 257 258 if (fc->cache) 259 kmem_cache_free(fc->cache, fc->sdata); 260 else 261 kfree(fc->sdata); 262 } 263 EXPORT_SYMBOL(p9_fcall_fini); 264 265 static struct kmem_cache *p9_req_cache; 266 267 /** 268 * p9_req_alloc - Allocate a new request. 269 * @c: Client session. 270 * @type: Transaction type. 271 * @max_size: Maximum packet size for this request. 272 * 273 * Context: Process context. 274 * Return: Pointer to new request. 275 */ 276 static struct p9_req_t * 277 p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size) 278 { 279 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); 280 int alloc_msize = min(c->msize, max_size); 281 int tag; 282 283 if (!req) 284 return ERR_PTR(-ENOMEM); 285 286 if (p9_fcall_init(c, &req->tc, alloc_msize)) 287 goto free_req; 288 if (p9_fcall_init(c, &req->rc, alloc_msize)) 289 goto free; 290 291 p9pdu_reset(&req->tc); 292 p9pdu_reset(&req->rc); 293 req->status = REQ_STATUS_ALLOC; 294 init_waitqueue_head(&req->wq); 295 INIT_LIST_HEAD(&req->req_list); 296 297 idr_preload(GFP_NOFS); 298 spin_lock_irq(&c->lock); 299 if (type == P9_TVERSION) 300 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1, 301 GFP_NOWAIT); 302 else 303 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT); 304 req->tc.tag = tag; 305 spin_unlock_irq(&c->lock); 306 idr_preload_end(); 307 if (tag < 0) 308 goto free; 309 310 /* Init ref to two because in the general case there is one ref 311 * that is put asynchronously by a writer thread, one ref 312 * temporarily given by p9_tag_lookup and put by p9_client_cb 313 * in the recv thread, and one ref put by p9_tag_remove in the 314 * main thread. The only exception is virtio that does not use 315 * p9_tag_lookup but does not have a writer thread either 316 * (the write happens synchronously in the request/zc_request 317 * callback), so p9_client_cb eats the second ref there 318 * as the pointer is duplicated directly by virtqueue_add_sgs() 319 */ 320 refcount_set(&req->refcount.refcount, 2); 321 322 return req; 323 324 free: 325 p9_fcall_fini(&req->tc); 326 p9_fcall_fini(&req->rc); 327 free_req: 328 kmem_cache_free(p9_req_cache, req); 329 return ERR_PTR(-ENOMEM); 330 } 331 332 /** 333 * p9_tag_lookup - Look up a request by tag. 334 * @c: Client session. 335 * @tag: Transaction ID. 336 * 337 * Context: Any context. 338 * Return: A request, or %NULL if there is no request with that tag. 339 */ 340 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 341 { 342 struct p9_req_t *req; 343 344 rcu_read_lock(); 345 again: 346 req = idr_find(&c->reqs, tag); 347 if (req) { 348 /* We have to be careful with the req found under rcu_read_lock 349 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the 350 * ref again without corrupting other data, then check again 351 * that the tag matches once we have the ref 352 */ 353 if (!p9_req_try_get(req)) 354 goto again; 355 if (req->tc.tag != tag) { 356 p9_req_put(req); 357 goto again; 358 } 359 } 360 rcu_read_unlock(); 361 362 return req; 363 } 364 EXPORT_SYMBOL(p9_tag_lookup); 365 366 /** 367 * p9_tag_remove - Remove a tag. 368 * @c: Client session. 369 * @r: Request of reference. 370 * 371 * Context: Any context. 372 */ 373 static int p9_tag_remove(struct p9_client *c, struct p9_req_t *r) 374 { 375 unsigned long flags; 376 u16 tag = r->tc.tag; 377 378 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); 379 spin_lock_irqsave(&c->lock, flags); 380 idr_remove(&c->reqs, tag); 381 spin_unlock_irqrestore(&c->lock, flags); 382 return p9_req_put(r); 383 } 384 385 static void p9_req_free(struct kref *ref) 386 { 387 struct p9_req_t *r = container_of(ref, struct p9_req_t, refcount); 388 p9_fcall_fini(&r->tc); 389 p9_fcall_fini(&r->rc); 390 kmem_cache_free(p9_req_cache, r); 391 } 392 393 int p9_req_put(struct p9_req_t *r) 394 { 395 return kref_put(&r->refcount, p9_req_free); 396 } 397 EXPORT_SYMBOL(p9_req_put); 398 399 /** 400 * p9_tag_cleanup - cleans up tags structure and reclaims resources 401 * @c: v9fs client struct 402 * 403 * This frees resources associated with the tags structure 404 * 405 */ 406 static void p9_tag_cleanup(struct p9_client *c) 407 { 408 struct p9_req_t *req; 409 int id; 410 411 rcu_read_lock(); 412 idr_for_each_entry(&c->reqs, req, id) { 413 pr_info("Tag %d still in use\n", id); 414 if (p9_tag_remove(c, req) == 0) 415 pr_warn("Packet with tag %d has still references", 416 req->tc.tag); 417 } 418 rcu_read_unlock(); 419 } 420 421 /** 422 * p9_client_cb - call back from transport to client 423 * c: client state 424 * req: request received 425 * 426 */ 427 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) 428 { 429 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); 430 431 /* 432 * This barrier is needed to make sure any change made to req before 433 * the status change is visible to another thread 434 */ 435 smp_wmb(); 436 req->status = status; 437 438 wake_up(&req->wq); 439 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); 440 p9_req_put(req); 441 } 442 EXPORT_SYMBOL(p9_client_cb); 443 444 /** 445 * p9_parse_header - parse header arguments out of a packet 446 * @pdu: packet to parse 447 * @size: size of packet 448 * @type: type of request 449 * @tag: tag of packet 450 * @rewind: set if we need to rewind offset afterwards 451 */ 452 453 int 454 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, 455 int rewind) 456 { 457 int8_t r_type; 458 int16_t r_tag; 459 int32_t r_size; 460 int offset = pdu->offset; 461 int err; 462 463 pdu->offset = 0; 464 465 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 466 if (err) 467 goto rewind_and_exit; 468 469 if (type) 470 *type = r_type; 471 if (tag) 472 *tag = r_tag; 473 if (size) 474 *size = r_size; 475 476 if (pdu->size != r_size || r_size < 7) { 477 err = -EINVAL; 478 goto rewind_and_exit; 479 } 480 481 pdu->id = r_type; 482 pdu->tag = r_tag; 483 484 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 485 pdu->size, pdu->id, pdu->tag); 486 487 rewind_and_exit: 488 if (rewind) 489 pdu->offset = offset; 490 return err; 491 } 492 EXPORT_SYMBOL(p9_parse_header); 493 494 /** 495 * p9_check_errors - check 9p packet for error return and process it 496 * @c: current client instance 497 * @req: request to parse and check for error conditions 498 * 499 * returns error code if one is discovered, otherwise returns 0 500 * 501 * this will have to be more complicated if we have multiple 502 * error packet types 503 */ 504 505 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 506 { 507 int8_t type; 508 int err; 509 int ecode; 510 511 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 512 if (req->rc.size >= c->msize) { 513 p9_debug(P9_DEBUG_ERROR, 514 "requested packet size too big: %d\n", 515 req->rc.size); 516 return -EIO; 517 } 518 /* 519 * dump the response from server 520 * This should be after check errors which poplulate pdu_fcall. 521 */ 522 trace_9p_protocol_dump(c, &req->rc); 523 if (err) { 524 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 525 return err; 526 } 527 if (type != P9_RERROR && type != P9_RLERROR) 528 return 0; 529 530 if (!p9_is_proto_dotl(c)) { 531 char *ename; 532 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 533 &ename, &ecode); 534 if (err) 535 goto out_err; 536 537 if (p9_is_proto_dotu(c) && ecode < 512) 538 err = -ecode; 539 540 if (!err) { 541 err = p9_errstr2errno(ename, strlen(ename)); 542 543 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 544 -ecode, ename); 545 } 546 kfree(ename); 547 } else { 548 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 549 err = -ecode; 550 551 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 552 } 553 554 return err; 555 556 out_err: 557 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 558 559 return err; 560 } 561 562 /** 563 * p9_check_zc_errors - check 9p packet for error return and process it 564 * @c: current client instance 565 * @req: request to parse and check for error conditions 566 * @in_hdrlen: Size of response protocol buffer. 567 * 568 * returns error code if one is discovered, otherwise returns 0 569 * 570 * this will have to be more complicated if we have multiple 571 * error packet types 572 */ 573 574 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req, 575 struct iov_iter *uidata, int in_hdrlen) 576 { 577 int err; 578 int ecode; 579 int8_t type; 580 char *ename = NULL; 581 582 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 583 /* 584 * dump the response from server 585 * This should be after parse_header which poplulate pdu_fcall. 586 */ 587 trace_9p_protocol_dump(c, &req->rc); 588 if (err) { 589 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 590 return err; 591 } 592 593 if (type != P9_RERROR && type != P9_RLERROR) 594 return 0; 595 596 if (!p9_is_proto_dotl(c)) { 597 /* Error is reported in string format */ 598 int len; 599 /* 7 = header size for RERROR; */ 600 int inline_len = in_hdrlen - 7; 601 602 len = req->rc.size - req->rc.offset; 603 if (len > (P9_ZC_HDR_SZ - 7)) { 604 err = -EFAULT; 605 goto out_err; 606 } 607 608 ename = &req->rc.sdata[req->rc.offset]; 609 if (len > inline_len) { 610 /* We have error in external buffer */ 611 if (!copy_from_iter_full(ename + inline_len, 612 len - inline_len, uidata)) { 613 err = -EFAULT; 614 goto out_err; 615 } 616 } 617 ename = NULL; 618 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 619 &ename, &ecode); 620 if (err) 621 goto out_err; 622 623 if (p9_is_proto_dotu(c) && ecode < 512) 624 err = -ecode; 625 626 if (!err) { 627 err = p9_errstr2errno(ename, strlen(ename)); 628 629 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 630 -ecode, ename); 631 } 632 kfree(ename); 633 } else { 634 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 635 err = -ecode; 636 637 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 638 } 639 return err; 640 641 out_err: 642 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 643 return err; 644 } 645 646 static struct p9_req_t * 647 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 648 649 /** 650 * p9_client_flush - flush (cancel) a request 651 * @c: client state 652 * @oldreq: request to cancel 653 * 654 * This sents a flush for a particular request and links 655 * the flush request to the original request. The current 656 * code only supports a single flush request although the protocol 657 * allows for multiple flush requests to be sent for a single request. 658 * 659 */ 660 661 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 662 { 663 struct p9_req_t *req; 664 int16_t oldtag; 665 int err; 666 667 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); 668 if (err) 669 return err; 670 671 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 672 673 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 674 if (IS_ERR(req)) 675 return PTR_ERR(req); 676 677 /* 678 * if we haven't received a response for oldreq, 679 * remove it from the list 680 */ 681 if (oldreq->status == REQ_STATUS_SENT) { 682 if (c->trans_mod->cancelled) 683 c->trans_mod->cancelled(c, oldreq); 684 } 685 686 p9_tag_remove(c, req); 687 return 0; 688 } 689 690 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 691 int8_t type, int req_size, 692 const char *fmt, va_list ap) 693 { 694 int err; 695 struct p9_req_t *req; 696 697 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 698 699 /* we allow for any status other than disconnected */ 700 if (c->status == Disconnected) 701 return ERR_PTR(-EIO); 702 703 /* if status is begin_disconnected we allow only clunk request */ 704 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) 705 return ERR_PTR(-EIO); 706 707 req = p9_tag_alloc(c, type, req_size); 708 if (IS_ERR(req)) 709 return req; 710 711 /* marshall the data */ 712 p9pdu_prepare(&req->tc, req->tc.tag, type); 713 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); 714 if (err) 715 goto reterr; 716 p9pdu_finalize(c, &req->tc); 717 trace_9p_client_req(c, type, req->tc.tag); 718 return req; 719 reterr: 720 p9_tag_remove(c, req); 721 /* We have to put also the 2nd reference as it won't be used */ 722 p9_req_put(req); 723 return ERR_PTR(err); 724 } 725 726 /** 727 * p9_client_rpc - issue a request and wait for a response 728 * @c: client session 729 * @type: type of request 730 * @fmt: protocol format string (see protocol.c) 731 * 732 * Returns request structure (which client must free using p9_tag_remove) 733 */ 734 735 static struct p9_req_t * 736 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 737 { 738 va_list ap; 739 int sigpending, err; 740 unsigned long flags; 741 struct p9_req_t *req; 742 743 va_start(ap, fmt); 744 req = p9_client_prepare_req(c, type, c->msize, fmt, ap); 745 va_end(ap); 746 if (IS_ERR(req)) 747 return req; 748 749 if (signal_pending(current)) { 750 sigpending = 1; 751 clear_thread_flag(TIF_SIGPENDING); 752 } else 753 sigpending = 0; 754 755 err = c->trans_mod->request(c, req); 756 if (err < 0) { 757 /* write won't happen */ 758 p9_req_put(req); 759 if (err != -ERESTARTSYS && err != -EFAULT) 760 c->status = Disconnected; 761 goto recalc_sigpending; 762 } 763 again: 764 /* Wait for the response */ 765 err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD); 766 767 /* 768 * Make sure our req is coherent with regard to updates in other 769 * threads - echoes to wmb() in the callback 770 */ 771 smp_rmb(); 772 773 if ((err == -ERESTARTSYS) && (c->status == Connected) 774 && (type == P9_TFLUSH)) { 775 sigpending = 1; 776 clear_thread_flag(TIF_SIGPENDING); 777 goto again; 778 } 779 780 if (req->status == REQ_STATUS_ERROR) { 781 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 782 err = req->t_err; 783 } 784 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 785 p9_debug(P9_DEBUG_MUX, "flushing\n"); 786 sigpending = 1; 787 clear_thread_flag(TIF_SIGPENDING); 788 789 if (c->trans_mod->cancel(c, req)) 790 p9_client_flush(c, req); 791 792 /* if we received the response anyway, don't signal error */ 793 if (req->status == REQ_STATUS_RCVD) 794 err = 0; 795 } 796 recalc_sigpending: 797 if (sigpending) { 798 spin_lock_irqsave(¤t->sighand->siglock, flags); 799 recalc_sigpending(); 800 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 801 } 802 if (err < 0) 803 goto reterr; 804 805 err = p9_check_errors(c, req); 806 trace_9p_client_res(c, type, req->rc.tag, err); 807 if (!err) 808 return req; 809 reterr: 810 p9_tag_remove(c, req); 811 return ERR_PTR(safe_errno(err)); 812 } 813 814 /** 815 * p9_client_zc_rpc - issue a request and wait for a response 816 * @c: client session 817 * @type: type of request 818 * @uidata: destination for zero copy read 819 * @uodata: source for zero copy write 820 * @inlen: read buffer size 821 * @olen: write buffer size 822 * @hdrlen: reader header size, This is the size of response protocol data 823 * @fmt: protocol format string (see protocol.c) 824 * 825 * Returns request structure (which client must free using p9_tag_remove) 826 */ 827 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 828 struct iov_iter *uidata, 829 struct iov_iter *uodata, 830 int inlen, int olen, int in_hdrlen, 831 const char *fmt, ...) 832 { 833 va_list ap; 834 int sigpending, err; 835 unsigned long flags; 836 struct p9_req_t *req; 837 838 va_start(ap, fmt); 839 /* 840 * We allocate a inline protocol data of only 4k bytes. 841 * The actual content is passed in zero-copy fashion. 842 */ 843 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); 844 va_end(ap); 845 if (IS_ERR(req)) 846 return req; 847 848 if (signal_pending(current)) { 849 sigpending = 1; 850 clear_thread_flag(TIF_SIGPENDING); 851 } else 852 sigpending = 0; 853 854 err = c->trans_mod->zc_request(c, req, uidata, uodata, 855 inlen, olen, in_hdrlen); 856 if (err < 0) { 857 if (err == -EIO) 858 c->status = Disconnected; 859 if (err != -ERESTARTSYS) 860 goto recalc_sigpending; 861 } 862 if (req->status == REQ_STATUS_ERROR) { 863 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 864 err = req->t_err; 865 } 866 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 867 p9_debug(P9_DEBUG_MUX, "flushing\n"); 868 sigpending = 1; 869 clear_thread_flag(TIF_SIGPENDING); 870 871 if (c->trans_mod->cancel(c, req)) 872 p9_client_flush(c, req); 873 874 /* if we received the response anyway, don't signal error */ 875 if (req->status == REQ_STATUS_RCVD) 876 err = 0; 877 } 878 recalc_sigpending: 879 if (sigpending) { 880 spin_lock_irqsave(¤t->sighand->siglock, flags); 881 recalc_sigpending(); 882 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 883 } 884 if (err < 0) 885 goto reterr; 886 887 err = p9_check_zc_errors(c, req, uidata, in_hdrlen); 888 trace_9p_client_res(c, type, req->rc.tag, err); 889 if (!err) 890 return req; 891 reterr: 892 p9_tag_remove(c, req); 893 return ERR_PTR(safe_errno(err)); 894 } 895 896 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 897 { 898 int ret; 899 struct p9_fid *fid; 900 901 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 902 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 903 if (!fid) 904 return NULL; 905 906 memset(&fid->qid, 0, sizeof(struct p9_qid)); 907 fid->mode = -1; 908 fid->uid = current_fsuid(); 909 fid->clnt = clnt; 910 fid->rdir = NULL; 911 fid->fid = 0; 912 913 idr_preload(GFP_KERNEL); 914 spin_lock_irq(&clnt->lock); 915 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, 916 GFP_NOWAIT); 917 spin_unlock_irq(&clnt->lock); 918 idr_preload_end(); 919 920 if (!ret) 921 return fid; 922 923 kfree(fid); 924 return NULL; 925 } 926 927 static void p9_fid_destroy(struct p9_fid *fid) 928 { 929 struct p9_client *clnt; 930 unsigned long flags; 931 932 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 933 clnt = fid->clnt; 934 spin_lock_irqsave(&clnt->lock, flags); 935 idr_remove(&clnt->fids, fid->fid); 936 spin_unlock_irqrestore(&clnt->lock, flags); 937 kfree(fid->rdir); 938 kfree(fid); 939 } 940 941 static int p9_client_version(struct p9_client *c) 942 { 943 int err = 0; 944 struct p9_req_t *req; 945 char *version = NULL; 946 int msize; 947 948 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 949 c->msize, c->proto_version); 950 951 switch (c->proto_version) { 952 case p9_proto_2000L: 953 req = p9_client_rpc(c, P9_TVERSION, "ds", 954 c->msize, "9P2000.L"); 955 break; 956 case p9_proto_2000u: 957 req = p9_client_rpc(c, P9_TVERSION, "ds", 958 c->msize, "9P2000.u"); 959 break; 960 case p9_proto_legacy: 961 req = p9_client_rpc(c, P9_TVERSION, "ds", 962 c->msize, "9P2000"); 963 break; 964 default: 965 return -EINVAL; 966 } 967 968 if (IS_ERR(req)) 969 return PTR_ERR(req); 970 971 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); 972 if (err) { 973 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 974 trace_9p_protocol_dump(c, &req->rc); 975 goto error; 976 } 977 978 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 979 if (!strncmp(version, "9P2000.L", 8)) 980 c->proto_version = p9_proto_2000L; 981 else if (!strncmp(version, "9P2000.u", 8)) 982 c->proto_version = p9_proto_2000u; 983 else if (!strncmp(version, "9P2000", 6)) 984 c->proto_version = p9_proto_legacy; 985 else { 986 err = -EREMOTEIO; 987 goto error; 988 } 989 990 if (msize < c->msize) 991 c->msize = msize; 992 993 error: 994 kfree(version); 995 p9_tag_remove(c, req); 996 997 return err; 998 } 999 1000 struct p9_client *p9_client_create(const char *dev_name, char *options) 1001 { 1002 int err; 1003 struct p9_client *clnt; 1004 char *client_id; 1005 1006 err = 0; 1007 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 1008 if (!clnt) 1009 return ERR_PTR(-ENOMEM); 1010 1011 clnt->trans_mod = NULL; 1012 clnt->trans = NULL; 1013 clnt->fcall_cache = NULL; 1014 1015 client_id = utsname()->nodename; 1016 memcpy(clnt->name, client_id, strlen(client_id) + 1); 1017 1018 spin_lock_init(&clnt->lock); 1019 idr_init(&clnt->fids); 1020 idr_init(&clnt->reqs); 1021 1022 err = parse_opts(options, clnt); 1023 if (err < 0) 1024 goto free_client; 1025 1026 if (!clnt->trans_mod) 1027 clnt->trans_mod = v9fs_get_default_trans(); 1028 1029 if (clnt->trans_mod == NULL) { 1030 err = -EPROTONOSUPPORT; 1031 p9_debug(P9_DEBUG_ERROR, 1032 "No transport defined or default transport\n"); 1033 goto free_client; 1034 } 1035 1036 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1037 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1038 1039 err = clnt->trans_mod->create(clnt, dev_name, options); 1040 if (err) 1041 goto put_trans; 1042 1043 if (clnt->msize > clnt->trans_mod->maxsize) 1044 clnt->msize = clnt->trans_mod->maxsize; 1045 1046 err = p9_client_version(clnt); 1047 if (err) 1048 goto close_trans; 1049 1050 /* P9_HDRSZ + 4 is the smallest packet header we can have that is 1051 * followed by data accessed from userspace by read 1052 */ 1053 clnt->fcall_cache = 1054 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, 1055 0, 0, P9_HDRSZ + 4, 1056 clnt->msize - (P9_HDRSZ + 4), 1057 NULL); 1058 1059 return clnt; 1060 1061 close_trans: 1062 clnt->trans_mod->close(clnt); 1063 put_trans: 1064 v9fs_put_trans(clnt->trans_mod); 1065 free_client: 1066 kfree(clnt); 1067 return ERR_PTR(err); 1068 } 1069 EXPORT_SYMBOL(p9_client_create); 1070 1071 void p9_client_destroy(struct p9_client *clnt) 1072 { 1073 struct p9_fid *fid; 1074 int id; 1075 1076 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1077 1078 if (clnt->trans_mod) 1079 clnt->trans_mod->close(clnt); 1080 1081 v9fs_put_trans(clnt->trans_mod); 1082 1083 idr_for_each_entry(&clnt->fids, fid, id) { 1084 pr_info("Found fid %d not clunked\n", fid->fid); 1085 p9_fid_destroy(fid); 1086 } 1087 1088 p9_tag_cleanup(clnt); 1089 1090 kmem_cache_destroy(clnt->fcall_cache); 1091 kfree(clnt); 1092 } 1093 EXPORT_SYMBOL(p9_client_destroy); 1094 1095 void p9_client_disconnect(struct p9_client *clnt) 1096 { 1097 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1098 clnt->status = Disconnected; 1099 } 1100 EXPORT_SYMBOL(p9_client_disconnect); 1101 1102 void p9_client_begin_disconnect(struct p9_client *clnt) 1103 { 1104 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1105 clnt->status = BeginDisconnect; 1106 } 1107 EXPORT_SYMBOL(p9_client_begin_disconnect); 1108 1109 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1110 const char *uname, kuid_t n_uname, const char *aname) 1111 { 1112 int err = 0; 1113 struct p9_req_t *req; 1114 struct p9_fid *fid; 1115 struct p9_qid qid; 1116 1117 1118 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1119 afid ? afid->fid : -1, uname, aname); 1120 fid = p9_fid_create(clnt); 1121 if (!fid) { 1122 err = -ENOMEM; 1123 goto error; 1124 } 1125 fid->uid = n_uname; 1126 1127 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1128 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1129 if (IS_ERR(req)) { 1130 err = PTR_ERR(req); 1131 goto error; 1132 } 1133 1134 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); 1135 if (err) { 1136 trace_9p_protocol_dump(clnt, &req->rc); 1137 p9_tag_remove(clnt, req); 1138 goto error; 1139 } 1140 1141 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1142 qid.type, (unsigned long long)qid.path, qid.version); 1143 1144 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1145 1146 p9_tag_remove(clnt, req); 1147 return fid; 1148 1149 error: 1150 if (fid) 1151 p9_fid_destroy(fid); 1152 return ERR_PTR(err); 1153 } 1154 EXPORT_SYMBOL(p9_client_attach); 1155 1156 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1157 const unsigned char * const *wnames, int clone) 1158 { 1159 int err; 1160 struct p9_client *clnt; 1161 struct p9_fid *fid; 1162 struct p9_qid *wqids; 1163 struct p9_req_t *req; 1164 uint16_t nwqids, count; 1165 1166 err = 0; 1167 wqids = NULL; 1168 clnt = oldfid->clnt; 1169 if (clone) { 1170 fid = p9_fid_create(clnt); 1171 if (!fid) { 1172 err = -ENOMEM; 1173 goto error; 1174 } 1175 1176 fid->uid = oldfid->uid; 1177 } else 1178 fid = oldfid; 1179 1180 1181 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1182 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1183 1184 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1185 nwname, wnames); 1186 if (IS_ERR(req)) { 1187 err = PTR_ERR(req); 1188 goto error; 1189 } 1190 1191 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1192 if (err) { 1193 trace_9p_protocol_dump(clnt, &req->rc); 1194 p9_tag_remove(clnt, req); 1195 goto clunk_fid; 1196 } 1197 p9_tag_remove(clnt, req); 1198 1199 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1200 1201 if (nwqids != nwname) { 1202 err = -ENOENT; 1203 goto clunk_fid; 1204 } 1205 1206 for (count = 0; count < nwqids; count++) 1207 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1208 count, wqids[count].type, 1209 (unsigned long long)wqids[count].path, 1210 wqids[count].version); 1211 1212 if (nwname) 1213 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1214 else 1215 fid->qid = oldfid->qid; 1216 1217 kfree(wqids); 1218 return fid; 1219 1220 clunk_fid: 1221 kfree(wqids); 1222 p9_client_clunk(fid); 1223 fid = NULL; 1224 1225 error: 1226 if (fid && (fid != oldfid)) 1227 p9_fid_destroy(fid); 1228 1229 return ERR_PTR(err); 1230 } 1231 EXPORT_SYMBOL(p9_client_walk); 1232 1233 int p9_client_open(struct p9_fid *fid, int mode) 1234 { 1235 int err; 1236 struct p9_client *clnt; 1237 struct p9_req_t *req; 1238 struct p9_qid qid; 1239 int iounit; 1240 1241 clnt = fid->clnt; 1242 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1243 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1244 err = 0; 1245 1246 if (fid->mode != -1) 1247 return -EINVAL; 1248 1249 if (p9_is_proto_dotl(clnt)) 1250 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1251 else 1252 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1253 if (IS_ERR(req)) { 1254 err = PTR_ERR(req); 1255 goto error; 1256 } 1257 1258 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1259 if (err) { 1260 trace_9p_protocol_dump(clnt, &req->rc); 1261 goto free_and_error; 1262 } 1263 1264 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1265 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1266 (unsigned long long)qid.path, qid.version, iounit); 1267 1268 fid->mode = mode; 1269 fid->iounit = iounit; 1270 1271 free_and_error: 1272 p9_tag_remove(clnt, req); 1273 error: 1274 return err; 1275 } 1276 EXPORT_SYMBOL(p9_client_open); 1277 1278 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode, 1279 kgid_t gid, struct p9_qid *qid) 1280 { 1281 int err = 0; 1282 struct p9_client *clnt; 1283 struct p9_req_t *req; 1284 int iounit; 1285 1286 p9_debug(P9_DEBUG_9P, 1287 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1288 ofid->fid, name, flags, mode, 1289 from_kgid(&init_user_ns, gid)); 1290 clnt = ofid->clnt; 1291 1292 if (ofid->mode != -1) 1293 return -EINVAL; 1294 1295 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1296 mode, gid); 1297 if (IS_ERR(req)) { 1298 err = PTR_ERR(req); 1299 goto error; 1300 } 1301 1302 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); 1303 if (err) { 1304 trace_9p_protocol_dump(clnt, &req->rc); 1305 goto free_and_error; 1306 } 1307 1308 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1309 qid->type, 1310 (unsigned long long)qid->path, 1311 qid->version, iounit); 1312 1313 ofid->mode = mode; 1314 ofid->iounit = iounit; 1315 1316 free_and_error: 1317 p9_tag_remove(clnt, req); 1318 error: 1319 return err; 1320 } 1321 EXPORT_SYMBOL(p9_client_create_dotl); 1322 1323 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1324 char *extension) 1325 { 1326 int err; 1327 struct p9_client *clnt; 1328 struct p9_req_t *req; 1329 struct p9_qid qid; 1330 int iounit; 1331 1332 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1333 fid->fid, name, perm, mode); 1334 err = 0; 1335 clnt = fid->clnt; 1336 1337 if (fid->mode != -1) 1338 return -EINVAL; 1339 1340 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1341 mode, extension); 1342 if (IS_ERR(req)) { 1343 err = PTR_ERR(req); 1344 goto error; 1345 } 1346 1347 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1348 if (err) { 1349 trace_9p_protocol_dump(clnt, &req->rc); 1350 goto free_and_error; 1351 } 1352 1353 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1354 qid.type, 1355 (unsigned long long)qid.path, 1356 qid.version, iounit); 1357 1358 fid->mode = mode; 1359 fid->iounit = iounit; 1360 1361 free_and_error: 1362 p9_tag_remove(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 = 0; 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, (unsigned long long)qid->path, qid->version); 1394 1395 free_and_error: 1396 p9_tag_remove(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_tag_remove(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; 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 err = 0; 1430 clnt = fid->clnt; 1431 1432 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1433 if (IS_ERR(req)) { 1434 err = PTR_ERR(req); 1435 goto error; 1436 } 1437 1438 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1439 1440 p9_tag_remove(clnt, req); 1441 1442 error: 1443 return err; 1444 } 1445 EXPORT_SYMBOL(p9_client_fsync); 1446 1447 int p9_client_clunk(struct p9_fid *fid) 1448 { 1449 int err; 1450 struct p9_client *clnt; 1451 struct p9_req_t *req; 1452 int retries = 0; 1453 1454 if (!fid) { 1455 pr_warn("%s (%d): Trying to clunk with NULL fid\n", 1456 __func__, task_pid_nr(current)); 1457 dump_stack(); 1458 return 0; 1459 } 1460 1461 again: 1462 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid, 1463 retries); 1464 err = 0; 1465 clnt = fid->clnt; 1466 1467 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1468 if (IS_ERR(req)) { 1469 err = PTR_ERR(req); 1470 goto error; 1471 } 1472 1473 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1474 1475 p9_tag_remove(clnt, req); 1476 error: 1477 /* 1478 * Fid is not valid even after a failed clunk 1479 * If interrupted, retry once then give up and 1480 * leak fid until umount. 1481 */ 1482 if (err == -ERESTARTSYS) { 1483 if (retries++ == 0) 1484 goto again; 1485 } else 1486 p9_fid_destroy(fid); 1487 return err; 1488 } 1489 EXPORT_SYMBOL(p9_client_clunk); 1490 1491 int p9_client_remove(struct p9_fid *fid) 1492 { 1493 int err; 1494 struct p9_client *clnt; 1495 struct p9_req_t *req; 1496 1497 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1498 err = 0; 1499 clnt = fid->clnt; 1500 1501 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1502 if (IS_ERR(req)) { 1503 err = PTR_ERR(req); 1504 goto error; 1505 } 1506 1507 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1508 1509 p9_tag_remove(clnt, req); 1510 error: 1511 if (err == -ERESTARTSYS) 1512 p9_client_clunk(fid); 1513 else 1514 p9_fid_destroy(fid); 1515 return err; 1516 } 1517 EXPORT_SYMBOL(p9_client_remove); 1518 1519 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1520 { 1521 int err = 0; 1522 struct p9_req_t *req; 1523 struct p9_client *clnt; 1524 1525 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1526 dfid->fid, name, flags); 1527 1528 clnt = dfid->clnt; 1529 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1530 if (IS_ERR(req)) { 1531 err = PTR_ERR(req); 1532 goto error; 1533 } 1534 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1535 1536 p9_tag_remove(clnt, req); 1537 error: 1538 return err; 1539 } 1540 EXPORT_SYMBOL(p9_client_unlinkat); 1541 1542 int 1543 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1544 { 1545 struct p9_client *clnt = fid->clnt; 1546 struct p9_req_t *req; 1547 int total = 0; 1548 *err = 0; 1549 1550 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", 1551 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to)); 1552 1553 while (iov_iter_count(to)) { 1554 int count = iov_iter_count(to); 1555 int rsize, non_zc = 0; 1556 char *dataptr; 1557 1558 rsize = fid->iounit; 1559 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1560 rsize = clnt->msize - P9_IOHDRSZ; 1561 1562 if (count < rsize) 1563 rsize = count; 1564 1565 /* Don't bother zerocopy for small IO (< 1024) */ 1566 if (clnt->trans_mod->zc_request && rsize > 1024) { 1567 /* 1568 * response header len is 11 1569 * PDU Header(7) + IO Size (4) 1570 */ 1571 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1572 0, 11, "dqd", fid->fid, 1573 offset, rsize); 1574 } else { 1575 non_zc = 1; 1576 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1577 rsize); 1578 } 1579 if (IS_ERR(req)) { 1580 *err = PTR_ERR(req); 1581 break; 1582 } 1583 1584 *err = p9pdu_readf(&req->rc, clnt->proto_version, 1585 "D", &count, &dataptr); 1586 if (*err) { 1587 trace_9p_protocol_dump(clnt, &req->rc); 1588 p9_tag_remove(clnt, req); 1589 break; 1590 } 1591 if (rsize < count) { 1592 pr_err("bogus RREAD count (%d > %d)\n", count, rsize); 1593 count = rsize; 1594 } 1595 1596 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1597 if (!count) { 1598 p9_tag_remove(clnt, req); 1599 break; 1600 } 1601 1602 if (non_zc) { 1603 int n = copy_to_iter(dataptr, count, to); 1604 total += n; 1605 offset += n; 1606 if (n != count) { 1607 *err = -EFAULT; 1608 p9_tag_remove(clnt, req); 1609 break; 1610 } 1611 } else { 1612 iov_iter_advance(to, count); 1613 total += count; 1614 offset += count; 1615 } 1616 p9_tag_remove(clnt, req); 1617 } 1618 return total; 1619 } 1620 EXPORT_SYMBOL(p9_client_read); 1621 1622 int 1623 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1624 { 1625 struct p9_client *clnt = fid->clnt; 1626 struct p9_req_t *req; 1627 int total = 0; 1628 *err = 0; 1629 1630 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", 1631 fid->fid, (unsigned long long) offset, 1632 iov_iter_count(from)); 1633 1634 while (iov_iter_count(from)) { 1635 int count = iov_iter_count(from); 1636 int rsize = fid->iounit; 1637 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1638 rsize = clnt->msize - P9_IOHDRSZ; 1639 1640 if (count < rsize) 1641 rsize = count; 1642 1643 /* Don't bother zerocopy for small IO (< 1024) */ 1644 if (clnt->trans_mod->zc_request && rsize > 1024) { 1645 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1646 rsize, P9_ZC_HDR_SZ, "dqd", 1647 fid->fid, offset, rsize); 1648 } else { 1649 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1650 offset, rsize, from); 1651 } 1652 if (IS_ERR(req)) { 1653 *err = PTR_ERR(req); 1654 break; 1655 } 1656 1657 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count); 1658 if (*err) { 1659 trace_9p_protocol_dump(clnt, &req->rc); 1660 p9_tag_remove(clnt, req); 1661 break; 1662 } 1663 if (rsize < count) { 1664 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize); 1665 count = rsize; 1666 } 1667 1668 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1669 1670 p9_tag_remove(clnt, req); 1671 iov_iter_advance(from, count); 1672 total += count; 1673 offset += count; 1674 } 1675 return total; 1676 } 1677 EXPORT_SYMBOL(p9_client_write); 1678 1679 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1680 { 1681 int err; 1682 struct p9_client *clnt; 1683 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1684 struct p9_req_t *req; 1685 u16 ignored; 1686 1687 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1688 1689 if (!ret) 1690 return ERR_PTR(-ENOMEM); 1691 1692 err = 0; 1693 clnt = fid->clnt; 1694 1695 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1696 if (IS_ERR(req)) { 1697 err = PTR_ERR(req); 1698 goto error; 1699 } 1700 1701 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); 1702 if (err) { 1703 trace_9p_protocol_dump(clnt, &req->rc); 1704 p9_tag_remove(clnt, req); 1705 goto error; 1706 } 1707 1708 p9_debug(P9_DEBUG_9P, 1709 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1710 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1711 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1712 "<<< uid=%d gid=%d n_muid=%d\n", 1713 ret->size, ret->type, ret->dev, ret->qid.type, 1714 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1715 ret->atime, ret->mtime, (unsigned long long)ret->length, 1716 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1717 from_kuid(&init_user_ns, ret->n_uid), 1718 from_kgid(&init_user_ns, ret->n_gid), 1719 from_kuid(&init_user_ns, ret->n_muid)); 1720 1721 p9_tag_remove(clnt, req); 1722 return ret; 1723 1724 error: 1725 kfree(ret); 1726 return ERR_PTR(err); 1727 } 1728 EXPORT_SYMBOL(p9_client_stat); 1729 1730 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1731 u64 request_mask) 1732 { 1733 int err; 1734 struct p9_client *clnt; 1735 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1736 GFP_KERNEL); 1737 struct p9_req_t *req; 1738 1739 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1740 fid->fid, request_mask); 1741 1742 if (!ret) 1743 return ERR_PTR(-ENOMEM); 1744 1745 err = 0; 1746 clnt = fid->clnt; 1747 1748 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1749 if (IS_ERR(req)) { 1750 err = PTR_ERR(req); 1751 goto error; 1752 } 1753 1754 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); 1755 if (err) { 1756 trace_9p_protocol_dump(clnt, &req->rc); 1757 p9_tag_remove(clnt, req); 1758 goto error; 1759 } 1760 1761 p9_debug(P9_DEBUG_9P, 1762 "<<< RGETATTR st_result_mask=%lld\n" 1763 "<<< qid=%x.%llx.%x\n" 1764 "<<< st_mode=%8.8x st_nlink=%llu\n" 1765 "<<< st_uid=%d st_gid=%d\n" 1766 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1767 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1768 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1769 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1770 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1771 "<<< st_gen=%lld st_data_version=%lld\n", 1772 ret->st_result_mask, ret->qid.type, ret->qid.path, 1773 ret->qid.version, ret->st_mode, ret->st_nlink, 1774 from_kuid(&init_user_ns, ret->st_uid), 1775 from_kgid(&init_user_ns, ret->st_gid), 1776 ret->st_rdev, ret->st_size, ret->st_blksize, 1777 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1778 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1779 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1780 ret->st_gen, ret->st_data_version); 1781 1782 p9_tag_remove(clnt, req); 1783 return ret; 1784 1785 error: 1786 kfree(ret); 1787 return ERR_PTR(err); 1788 } 1789 EXPORT_SYMBOL(p9_client_getattr_dotl); 1790 1791 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1792 { 1793 int ret; 1794 1795 /* NOTE: size shouldn't include its own length */ 1796 /* size[2] type[2] dev[4] qid[13] */ 1797 /* mode[4] atime[4] mtime[4] length[8]*/ 1798 /* name[s] uid[s] gid[s] muid[s] */ 1799 ret = 2+4+13+4+4+4+8+2+2+2+2; 1800 1801 if (wst->name) 1802 ret += strlen(wst->name); 1803 if (wst->uid) 1804 ret += strlen(wst->uid); 1805 if (wst->gid) 1806 ret += strlen(wst->gid); 1807 if (wst->muid) 1808 ret += strlen(wst->muid); 1809 1810 if ((proto_version == p9_proto_2000u) || 1811 (proto_version == p9_proto_2000L)) { 1812 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1813 if (wst->extension) 1814 ret += strlen(wst->extension); 1815 } 1816 1817 return ret; 1818 } 1819 1820 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1821 { 1822 int err; 1823 struct p9_req_t *req; 1824 struct p9_client *clnt; 1825 1826 err = 0; 1827 clnt = fid->clnt; 1828 wst->size = p9_client_statsize(wst, clnt->proto_version); 1829 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1830 p9_debug(P9_DEBUG_9P, 1831 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1832 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1833 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1834 " uid=%d gid=%d n_muid=%d\n", 1835 wst->size, wst->type, wst->dev, wst->qid.type, 1836 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1837 wst->atime, wst->mtime, (unsigned long long)wst->length, 1838 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1839 from_kuid(&init_user_ns, wst->n_uid), 1840 from_kgid(&init_user_ns, wst->n_gid), 1841 from_kuid(&init_user_ns, wst->n_muid)); 1842 1843 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1844 if (IS_ERR(req)) { 1845 err = PTR_ERR(req); 1846 goto error; 1847 } 1848 1849 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1850 1851 p9_tag_remove(clnt, req); 1852 error: 1853 return err; 1854 } 1855 EXPORT_SYMBOL(p9_client_wstat); 1856 1857 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1858 { 1859 int err; 1860 struct p9_req_t *req; 1861 struct p9_client *clnt; 1862 1863 err = 0; 1864 clnt = fid->clnt; 1865 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1866 p9_debug(P9_DEBUG_9P, 1867 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1868 " atime_sec=%lld atime_nsec=%lld\n" 1869 " mtime_sec=%lld mtime_nsec=%lld\n", 1870 p9attr->valid, p9attr->mode, 1871 from_kuid(&init_user_ns, p9attr->uid), 1872 from_kgid(&init_user_ns, p9attr->gid), 1873 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1874 p9attr->mtime_sec, p9attr->mtime_nsec); 1875 1876 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1877 1878 if (IS_ERR(req)) { 1879 err = PTR_ERR(req); 1880 goto error; 1881 } 1882 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1883 p9_tag_remove(clnt, req); 1884 error: 1885 return err; 1886 } 1887 EXPORT_SYMBOL(p9_client_setattr); 1888 1889 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1890 { 1891 int err; 1892 struct p9_req_t *req; 1893 struct p9_client *clnt; 1894 1895 err = 0; 1896 clnt = fid->clnt; 1897 1898 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1899 1900 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1901 if (IS_ERR(req)) { 1902 err = PTR_ERR(req); 1903 goto error; 1904 } 1905 1906 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1907 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1908 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1909 if (err) { 1910 trace_9p_protocol_dump(clnt, &req->rc); 1911 p9_tag_remove(clnt, req); 1912 goto error; 1913 } 1914 1915 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1916 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1917 "fsid %llu namelen %ld\n", 1918 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1919 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1920 sb->fsid, (long int)sb->namelen); 1921 1922 p9_tag_remove(clnt, req); 1923 error: 1924 return err; 1925 } 1926 EXPORT_SYMBOL(p9_client_statfs); 1927 1928 int p9_client_rename(struct p9_fid *fid, 1929 struct p9_fid *newdirfid, const char *name) 1930 { 1931 int err; 1932 struct p9_req_t *req; 1933 struct p9_client *clnt; 1934 1935 err = 0; 1936 clnt = fid->clnt; 1937 1938 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1939 fid->fid, newdirfid->fid, name); 1940 1941 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1942 newdirfid->fid, name); 1943 if (IS_ERR(req)) { 1944 err = PTR_ERR(req); 1945 goto error; 1946 } 1947 1948 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1949 1950 p9_tag_remove(clnt, req); 1951 error: 1952 return err; 1953 } 1954 EXPORT_SYMBOL(p9_client_rename); 1955 1956 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1957 struct p9_fid *newdirfid, const char *new_name) 1958 { 1959 int err; 1960 struct p9_req_t *req; 1961 struct p9_client *clnt; 1962 1963 err = 0; 1964 clnt = olddirfid->clnt; 1965 1966 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" 1967 " newdirfid %d new name %s\n", olddirfid->fid, old_name, 1968 newdirfid->fid, new_name); 1969 1970 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1971 old_name, newdirfid->fid, new_name); 1972 if (IS_ERR(req)) { 1973 err = PTR_ERR(req); 1974 goto error; 1975 } 1976 1977 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1978 newdirfid->fid, new_name); 1979 1980 p9_tag_remove(clnt, req); 1981 error: 1982 return err; 1983 } 1984 EXPORT_SYMBOL(p9_client_renameat); 1985 1986 /* 1987 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1988 */ 1989 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1990 const char *attr_name, u64 *attr_size) 1991 { 1992 int err; 1993 struct p9_req_t *req; 1994 struct p9_client *clnt; 1995 struct p9_fid *attr_fid; 1996 1997 err = 0; 1998 clnt = file_fid->clnt; 1999 attr_fid = p9_fid_create(clnt); 2000 if (!attr_fid) { 2001 err = -ENOMEM; 2002 goto error; 2003 } 2004 p9_debug(P9_DEBUG_9P, 2005 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 2006 file_fid->fid, attr_fid->fid, attr_name); 2007 2008 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 2009 file_fid->fid, attr_fid->fid, attr_name); 2010 if (IS_ERR(req)) { 2011 err = PTR_ERR(req); 2012 goto error; 2013 } 2014 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); 2015 if (err) { 2016 trace_9p_protocol_dump(clnt, &req->rc); 2017 p9_tag_remove(clnt, req); 2018 goto clunk_fid; 2019 } 2020 p9_tag_remove(clnt, req); 2021 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2022 attr_fid->fid, *attr_size); 2023 return attr_fid; 2024 clunk_fid: 2025 p9_client_clunk(attr_fid); 2026 attr_fid = NULL; 2027 error: 2028 if (attr_fid && (attr_fid != file_fid)) 2029 p9_fid_destroy(attr_fid); 2030 2031 return ERR_PTR(err); 2032 } 2033 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2034 2035 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2036 u64 attr_size, int flags) 2037 { 2038 int err; 2039 struct p9_req_t *req; 2040 struct p9_client *clnt; 2041 2042 p9_debug(P9_DEBUG_9P, 2043 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 2044 fid->fid, name, (long long)attr_size, flags); 2045 err = 0; 2046 clnt = fid->clnt; 2047 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2048 fid->fid, name, attr_size, flags); 2049 if (IS_ERR(req)) { 2050 err = PTR_ERR(req); 2051 goto error; 2052 } 2053 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2054 p9_tag_remove(clnt, req); 2055 error: 2056 return err; 2057 } 2058 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2059 2060 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2061 { 2062 int err, rsize, non_zc = 0; 2063 struct p9_client *clnt; 2064 struct p9_req_t *req; 2065 char *dataptr; 2066 struct kvec kv = {.iov_base = data, .iov_len = count}; 2067 struct iov_iter to; 2068 2069 iov_iter_kvec(&to, READ, &kv, 1, count); 2070 2071 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2072 fid->fid, (unsigned long long) offset, count); 2073 2074 err = 0; 2075 clnt = fid->clnt; 2076 2077 rsize = fid->iounit; 2078 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 2079 rsize = clnt->msize - P9_READDIRHDRSZ; 2080 2081 if (count < rsize) 2082 rsize = count; 2083 2084 /* Don't bother zerocopy for small IO (< 1024) */ 2085 if (clnt->trans_mod->zc_request && rsize > 1024) { 2086 /* 2087 * response header len is 11 2088 * PDU Header(7) + IO Size (4) 2089 */ 2090 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2091 11, "dqd", fid->fid, offset, rsize); 2092 } else { 2093 non_zc = 1; 2094 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2095 offset, rsize); 2096 } 2097 if (IS_ERR(req)) { 2098 err = PTR_ERR(req); 2099 goto error; 2100 } 2101 2102 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); 2103 if (err) { 2104 trace_9p_protocol_dump(clnt, &req->rc); 2105 goto free_and_error; 2106 } 2107 if (rsize < count) { 2108 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2109 count = rsize; 2110 } 2111 2112 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2113 2114 if (non_zc) 2115 memmove(data, dataptr, count); 2116 2117 p9_tag_remove(clnt, req); 2118 return count; 2119 2120 free_and_error: 2121 p9_tag_remove(clnt, req); 2122 error: 2123 return err; 2124 } 2125 EXPORT_SYMBOL(p9_client_readdir); 2126 2127 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2128 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2129 { 2130 int err; 2131 struct p9_client *clnt; 2132 struct p9_req_t *req; 2133 2134 err = 0; 2135 clnt = fid->clnt; 2136 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 2137 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2138 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2139 MAJOR(rdev), MINOR(rdev), gid); 2140 if (IS_ERR(req)) 2141 return PTR_ERR(req); 2142 2143 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2144 if (err) { 2145 trace_9p_protocol_dump(clnt, &req->rc); 2146 goto error; 2147 } 2148 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 2149 (unsigned long long)qid->path, qid->version); 2150 2151 error: 2152 p9_tag_remove(clnt, req); 2153 return err; 2154 2155 } 2156 EXPORT_SYMBOL(p9_client_mknod_dotl); 2157 2158 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2159 kgid_t gid, struct p9_qid *qid) 2160 { 2161 int err; 2162 struct p9_client *clnt; 2163 struct p9_req_t *req; 2164 2165 err = 0; 2166 clnt = fid->clnt; 2167 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2168 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2169 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode, 2170 gid); 2171 if (IS_ERR(req)) 2172 return PTR_ERR(req); 2173 2174 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2175 if (err) { 2176 trace_9p_protocol_dump(clnt, &req->rc); 2177 goto error; 2178 } 2179 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2180 (unsigned long long)qid->path, qid->version); 2181 2182 error: 2183 p9_tag_remove(clnt, req); 2184 return err; 2185 2186 } 2187 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2188 2189 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2190 { 2191 int err; 2192 struct p9_client *clnt; 2193 struct p9_req_t *req; 2194 2195 err = 0; 2196 clnt = fid->clnt; 2197 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " 2198 "start %lld length %lld proc_id %d client_id %s\n", 2199 fid->fid, flock->type, flock->flags, flock->start, 2200 flock->length, flock->proc_id, flock->client_id); 2201 2202 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2203 flock->flags, flock->start, flock->length, 2204 flock->proc_id, flock->client_id); 2205 2206 if (IS_ERR(req)) 2207 return PTR_ERR(req); 2208 2209 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); 2210 if (err) { 2211 trace_9p_protocol_dump(clnt, &req->rc); 2212 goto error; 2213 } 2214 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2215 error: 2216 p9_tag_remove(clnt, req); 2217 return err; 2218 2219 } 2220 EXPORT_SYMBOL(p9_client_lock_dotl); 2221 2222 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2223 { 2224 int err; 2225 struct p9_client *clnt; 2226 struct p9_req_t *req; 2227 2228 err = 0; 2229 clnt = fid->clnt; 2230 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " 2231 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, 2232 glock->start, glock->length, glock->proc_id, glock->client_id); 2233 2234 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, 2235 glock->start, glock->length, glock->proc_id, glock->client_id); 2236 2237 if (IS_ERR(req)) 2238 return PTR_ERR(req); 2239 2240 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, 2241 &glock->start, &glock->length, &glock->proc_id, 2242 &glock->client_id); 2243 if (err) { 2244 trace_9p_protocol_dump(clnt, &req->rc); 2245 goto error; 2246 } 2247 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " 2248 "proc_id %d client_id %s\n", glock->type, glock->start, 2249 glock->length, glock->proc_id, glock->client_id); 2250 error: 2251 p9_tag_remove(clnt, req); 2252 return err; 2253 } 2254 EXPORT_SYMBOL(p9_client_getlock_dotl); 2255 2256 int p9_client_readlink(struct p9_fid *fid, char **target) 2257 { 2258 int err; 2259 struct p9_client *clnt; 2260 struct p9_req_t *req; 2261 2262 err = 0; 2263 clnt = fid->clnt; 2264 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2265 2266 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2267 if (IS_ERR(req)) 2268 return PTR_ERR(req); 2269 2270 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); 2271 if (err) { 2272 trace_9p_protocol_dump(clnt, &req->rc); 2273 goto error; 2274 } 2275 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2276 error: 2277 p9_tag_remove(clnt, req); 2278 return err; 2279 } 2280 EXPORT_SYMBOL(p9_client_readlink); 2281 2282 int __init p9_client_init(void) 2283 { 2284 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); 2285 return p9_req_cache ? 0 : -ENOMEM; 2286 } 2287 2288 void __exit p9_client_exit(void) 2289 { 2290 kmem_cache_destroy(p9_req_cache); 2291 } 2292