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 if (option < 4096) { 185 p9_debug(P9_DEBUG_ERROR, 186 "msize should be at least 4k\n"); 187 ret = -EINVAL; 188 continue; 189 } 190 clnt->msize = option; 191 break; 192 case Opt_trans: 193 s = match_strdup(&args[0]); 194 if (!s) { 195 ret = -ENOMEM; 196 p9_debug(P9_DEBUG_ERROR, 197 "problem allocating copy of trans arg\n"); 198 goto free_and_return; 199 } 200 201 v9fs_put_trans(clnt->trans_mod); 202 clnt->trans_mod = v9fs_get_trans_by_name(s); 203 if (clnt->trans_mod == NULL) { 204 pr_info("Could not find request transport: %s\n", 205 s); 206 ret = -EINVAL; 207 } 208 kfree(s); 209 break; 210 case Opt_legacy: 211 clnt->proto_version = p9_proto_legacy; 212 break; 213 case Opt_version: 214 s = match_strdup(&args[0]); 215 if (!s) { 216 ret = -ENOMEM; 217 p9_debug(P9_DEBUG_ERROR, 218 "problem allocating copy of version arg\n"); 219 goto free_and_return; 220 } 221 r = get_protocol_version(s); 222 if (r < 0) 223 ret = r; 224 else 225 clnt->proto_version = r; 226 kfree(s); 227 break; 228 default: 229 continue; 230 } 231 } 232 233 free_and_return: 234 if (ret) 235 v9fs_put_trans(clnt->trans_mod); 236 kfree(tmp_options); 237 return ret; 238 } 239 240 static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc, 241 int alloc_msize) 242 { 243 if (likely(c->fcall_cache) && alloc_msize == c->msize) { 244 fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS); 245 fc->cache = c->fcall_cache; 246 } else { 247 fc->sdata = kmalloc(alloc_msize, GFP_NOFS); 248 fc->cache = NULL; 249 } 250 if (!fc->sdata) 251 return -ENOMEM; 252 fc->capacity = alloc_msize; 253 return 0; 254 } 255 256 void p9_fcall_fini(struct p9_fcall *fc) 257 { 258 /* sdata can be NULL for interrupted requests in trans_rdma, 259 * and kmem_cache_free does not do NULL-check for us 260 */ 261 if (unlikely(!fc->sdata)) 262 return; 263 264 if (fc->cache) 265 kmem_cache_free(fc->cache, fc->sdata); 266 else 267 kfree(fc->sdata); 268 } 269 EXPORT_SYMBOL(p9_fcall_fini); 270 271 static struct kmem_cache *p9_req_cache; 272 273 /** 274 * p9_req_alloc - Allocate a new request. 275 * @c: Client session. 276 * @type: Transaction type. 277 * @max_size: Maximum packet size for this request. 278 * 279 * Context: Process context. 280 * Return: Pointer to new request. 281 */ 282 static struct p9_req_t * 283 p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size) 284 { 285 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); 286 int alloc_msize = min(c->msize, max_size); 287 int tag; 288 289 if (!req) 290 return ERR_PTR(-ENOMEM); 291 292 if (p9_fcall_init(c, &req->tc, alloc_msize)) 293 goto free_req; 294 if (p9_fcall_init(c, &req->rc, alloc_msize)) 295 goto free; 296 297 p9pdu_reset(&req->tc); 298 p9pdu_reset(&req->rc); 299 req->status = REQ_STATUS_ALLOC; 300 init_waitqueue_head(&req->wq); 301 INIT_LIST_HEAD(&req->req_list); 302 303 idr_preload(GFP_NOFS); 304 spin_lock_irq(&c->lock); 305 if (type == P9_TVERSION) 306 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1, 307 GFP_NOWAIT); 308 else 309 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT); 310 req->tc.tag = tag; 311 spin_unlock_irq(&c->lock); 312 idr_preload_end(); 313 if (tag < 0) 314 goto free; 315 316 /* Init ref to two because in the general case there is one ref 317 * that is put asynchronously by a writer thread, one ref 318 * temporarily given by p9_tag_lookup and put by p9_client_cb 319 * in the recv thread, and one ref put by p9_tag_remove in the 320 * main thread. The only exception is virtio that does not use 321 * p9_tag_lookup but does not have a writer thread either 322 * (the write happens synchronously in the request/zc_request 323 * callback), so p9_client_cb eats the second ref there 324 * as the pointer is duplicated directly by virtqueue_add_sgs() 325 */ 326 refcount_set(&req->refcount.refcount, 2); 327 328 return req; 329 330 free: 331 p9_fcall_fini(&req->tc); 332 p9_fcall_fini(&req->rc); 333 free_req: 334 kmem_cache_free(p9_req_cache, req); 335 return ERR_PTR(-ENOMEM); 336 } 337 338 /** 339 * p9_tag_lookup - Look up a request by tag. 340 * @c: Client session. 341 * @tag: Transaction ID. 342 * 343 * Context: Any context. 344 * Return: A request, or %NULL if there is no request with that tag. 345 */ 346 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 347 { 348 struct p9_req_t *req; 349 350 rcu_read_lock(); 351 again: 352 req = idr_find(&c->reqs, tag); 353 if (req) { 354 /* We have to be careful with the req found under rcu_read_lock 355 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the 356 * ref again without corrupting other data, then check again 357 * that the tag matches once we have the ref 358 */ 359 if (!p9_req_try_get(req)) 360 goto again; 361 if (req->tc.tag != tag) { 362 p9_req_put(req); 363 goto again; 364 } 365 } 366 rcu_read_unlock(); 367 368 return req; 369 } 370 EXPORT_SYMBOL(p9_tag_lookup); 371 372 /** 373 * p9_tag_remove - Remove a tag. 374 * @c: Client session. 375 * @r: Request of reference. 376 * 377 * Context: Any context. 378 */ 379 static int p9_tag_remove(struct p9_client *c, struct p9_req_t *r) 380 { 381 unsigned long flags; 382 u16 tag = r->tc.tag; 383 384 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); 385 spin_lock_irqsave(&c->lock, flags); 386 idr_remove(&c->reqs, tag); 387 spin_unlock_irqrestore(&c->lock, flags); 388 return p9_req_put(r); 389 } 390 391 static void p9_req_free(struct kref *ref) 392 { 393 struct p9_req_t *r = container_of(ref, struct p9_req_t, refcount); 394 p9_fcall_fini(&r->tc); 395 p9_fcall_fini(&r->rc); 396 kmem_cache_free(p9_req_cache, r); 397 } 398 399 int p9_req_put(struct p9_req_t *r) 400 { 401 return kref_put(&r->refcount, p9_req_free); 402 } 403 EXPORT_SYMBOL(p9_req_put); 404 405 /** 406 * p9_tag_cleanup - cleans up tags structure and reclaims resources 407 * @c: v9fs client struct 408 * 409 * This frees resources associated with the tags structure 410 * 411 */ 412 static void p9_tag_cleanup(struct p9_client *c) 413 { 414 struct p9_req_t *req; 415 int id; 416 417 rcu_read_lock(); 418 idr_for_each_entry(&c->reqs, req, id) { 419 pr_info("Tag %d still in use\n", id); 420 if (p9_tag_remove(c, req) == 0) 421 pr_warn("Packet with tag %d has still references", 422 req->tc.tag); 423 } 424 rcu_read_unlock(); 425 } 426 427 /** 428 * p9_client_cb - call back from transport to client 429 * c: client state 430 * req: request received 431 * 432 */ 433 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) 434 { 435 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); 436 437 /* 438 * This barrier is needed to make sure any change made to req before 439 * the status change is visible to another thread 440 */ 441 smp_wmb(); 442 req->status = status; 443 444 wake_up(&req->wq); 445 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); 446 p9_req_put(req); 447 } 448 EXPORT_SYMBOL(p9_client_cb); 449 450 /** 451 * p9_parse_header - parse header arguments out of a packet 452 * @pdu: packet to parse 453 * @size: size of packet 454 * @type: type of request 455 * @tag: tag of packet 456 * @rewind: set if we need to rewind offset afterwards 457 */ 458 459 int 460 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, 461 int rewind) 462 { 463 int8_t r_type; 464 int16_t r_tag; 465 int32_t r_size; 466 int offset = pdu->offset; 467 int err; 468 469 pdu->offset = 0; 470 471 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 472 if (err) 473 goto rewind_and_exit; 474 475 if (type) 476 *type = r_type; 477 if (tag) 478 *tag = r_tag; 479 if (size) 480 *size = r_size; 481 482 if (pdu->size != r_size || r_size < 7) { 483 err = -EINVAL; 484 goto rewind_and_exit; 485 } 486 487 pdu->id = r_type; 488 pdu->tag = r_tag; 489 490 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 491 pdu->size, pdu->id, pdu->tag); 492 493 rewind_and_exit: 494 if (rewind) 495 pdu->offset = offset; 496 return err; 497 } 498 EXPORT_SYMBOL(p9_parse_header); 499 500 /** 501 * p9_check_errors - check 9p packet for error return and process it 502 * @c: current client instance 503 * @req: request to parse and check for error conditions 504 * 505 * returns error code if one is discovered, otherwise returns 0 506 * 507 * this will have to be more complicated if we have multiple 508 * error packet types 509 */ 510 511 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 512 { 513 int8_t type; 514 int err; 515 int ecode; 516 517 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 518 if (req->rc.size >= c->msize) { 519 p9_debug(P9_DEBUG_ERROR, 520 "requested packet size too big: %d\n", 521 req->rc.size); 522 return -EIO; 523 } 524 /* 525 * dump the response from server 526 * This should be after check errors which poplulate pdu_fcall. 527 */ 528 trace_9p_protocol_dump(c, &req->rc); 529 if (err) { 530 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 531 return err; 532 } 533 if (type != P9_RERROR && type != P9_RLERROR) 534 return 0; 535 536 if (!p9_is_proto_dotl(c)) { 537 char *ename; 538 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 539 &ename, &ecode); 540 if (err) 541 goto out_err; 542 543 if (p9_is_proto_dotu(c) && ecode < 512) 544 err = -ecode; 545 546 if (!err) { 547 err = p9_errstr2errno(ename, strlen(ename)); 548 549 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 550 -ecode, ename); 551 } 552 kfree(ename); 553 } else { 554 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 555 err = -ecode; 556 557 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 558 } 559 560 return err; 561 562 out_err: 563 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 564 565 return err; 566 } 567 568 /** 569 * p9_check_zc_errors - check 9p packet for error return and process it 570 * @c: current client instance 571 * @req: request to parse and check for error conditions 572 * @in_hdrlen: Size of response protocol buffer. 573 * 574 * returns error code if one is discovered, otherwise returns 0 575 * 576 * this will have to be more complicated if we have multiple 577 * error packet types 578 */ 579 580 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req, 581 struct iov_iter *uidata, int in_hdrlen) 582 { 583 int err; 584 int ecode; 585 int8_t type; 586 char *ename = NULL; 587 588 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 589 /* 590 * dump the response from server 591 * This should be after parse_header which poplulate pdu_fcall. 592 */ 593 trace_9p_protocol_dump(c, &req->rc); 594 if (err) { 595 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 596 return err; 597 } 598 599 if (type != P9_RERROR && type != P9_RLERROR) 600 return 0; 601 602 if (!p9_is_proto_dotl(c)) { 603 /* Error is reported in string format */ 604 int len; 605 /* 7 = header size for RERROR; */ 606 int inline_len = in_hdrlen - 7; 607 608 len = req->rc.size - req->rc.offset; 609 if (len > (P9_ZC_HDR_SZ - 7)) { 610 err = -EFAULT; 611 goto out_err; 612 } 613 614 ename = &req->rc.sdata[req->rc.offset]; 615 if (len > inline_len) { 616 /* We have error in external buffer */ 617 if (!copy_from_iter_full(ename + inline_len, 618 len - inline_len, uidata)) { 619 err = -EFAULT; 620 goto out_err; 621 } 622 } 623 ename = NULL; 624 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 625 &ename, &ecode); 626 if (err) 627 goto out_err; 628 629 if (p9_is_proto_dotu(c) && ecode < 512) 630 err = -ecode; 631 632 if (!err) { 633 err = p9_errstr2errno(ename, strlen(ename)); 634 635 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 636 -ecode, ename); 637 } 638 kfree(ename); 639 } else { 640 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 641 err = -ecode; 642 643 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 644 } 645 return err; 646 647 out_err: 648 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 649 return err; 650 } 651 652 static struct p9_req_t * 653 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 654 655 /** 656 * p9_client_flush - flush (cancel) a request 657 * @c: client state 658 * @oldreq: request to cancel 659 * 660 * This sents a flush for a particular request and links 661 * the flush request to the original request. The current 662 * code only supports a single flush request although the protocol 663 * allows for multiple flush requests to be sent for a single request. 664 * 665 */ 666 667 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 668 { 669 struct p9_req_t *req; 670 int16_t oldtag; 671 int err; 672 673 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); 674 if (err) 675 return err; 676 677 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 678 679 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 680 if (IS_ERR(req)) 681 return PTR_ERR(req); 682 683 /* 684 * if we haven't received a response for oldreq, 685 * remove it from the list 686 */ 687 if (oldreq->status == REQ_STATUS_SENT) { 688 if (c->trans_mod->cancelled) 689 c->trans_mod->cancelled(c, oldreq); 690 } 691 692 p9_tag_remove(c, req); 693 return 0; 694 } 695 696 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 697 int8_t type, int req_size, 698 const char *fmt, va_list ap) 699 { 700 int err; 701 struct p9_req_t *req; 702 703 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 704 705 /* we allow for any status other than disconnected */ 706 if (c->status == Disconnected) 707 return ERR_PTR(-EIO); 708 709 /* if status is begin_disconnected we allow only clunk request */ 710 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) 711 return ERR_PTR(-EIO); 712 713 req = p9_tag_alloc(c, type, req_size); 714 if (IS_ERR(req)) 715 return req; 716 717 /* marshall the data */ 718 p9pdu_prepare(&req->tc, req->tc.tag, type); 719 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); 720 if (err) 721 goto reterr; 722 p9pdu_finalize(c, &req->tc); 723 trace_9p_client_req(c, type, req->tc.tag); 724 return req; 725 reterr: 726 p9_tag_remove(c, req); 727 /* We have to put also the 2nd reference as it won't be used */ 728 p9_req_put(req); 729 return ERR_PTR(err); 730 } 731 732 /** 733 * p9_client_rpc - issue a request and wait for a response 734 * @c: client session 735 * @type: type of request 736 * @fmt: protocol format string (see protocol.c) 737 * 738 * Returns request structure (which client must free using p9_tag_remove) 739 */ 740 741 static struct p9_req_t * 742 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 743 { 744 va_list ap; 745 int sigpending, err; 746 unsigned long flags; 747 struct p9_req_t *req; 748 749 va_start(ap, fmt); 750 req = p9_client_prepare_req(c, type, c->msize, fmt, ap); 751 va_end(ap); 752 if (IS_ERR(req)) 753 return req; 754 755 if (signal_pending(current)) { 756 sigpending = 1; 757 clear_thread_flag(TIF_SIGPENDING); 758 } else 759 sigpending = 0; 760 761 err = c->trans_mod->request(c, req); 762 if (err < 0) { 763 /* write won't happen */ 764 p9_req_put(req); 765 if (err != -ERESTARTSYS && err != -EFAULT) 766 c->status = Disconnected; 767 goto recalc_sigpending; 768 } 769 again: 770 /* Wait for the response */ 771 err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD); 772 773 /* 774 * Make sure our req is coherent with regard to updates in other 775 * threads - echoes to wmb() in the callback 776 */ 777 smp_rmb(); 778 779 if ((err == -ERESTARTSYS) && (c->status == Connected) 780 && (type == P9_TFLUSH)) { 781 sigpending = 1; 782 clear_thread_flag(TIF_SIGPENDING); 783 goto again; 784 } 785 786 if (req->status == REQ_STATUS_ERROR) { 787 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 788 err = req->t_err; 789 } 790 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 791 p9_debug(P9_DEBUG_MUX, "flushing\n"); 792 sigpending = 1; 793 clear_thread_flag(TIF_SIGPENDING); 794 795 if (c->trans_mod->cancel(c, req)) 796 p9_client_flush(c, req); 797 798 /* if we received the response anyway, don't signal error */ 799 if (req->status == REQ_STATUS_RCVD) 800 err = 0; 801 } 802 recalc_sigpending: 803 if (sigpending) { 804 spin_lock_irqsave(¤t->sighand->siglock, flags); 805 recalc_sigpending(); 806 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 807 } 808 if (err < 0) 809 goto reterr; 810 811 err = p9_check_errors(c, req); 812 trace_9p_client_res(c, type, req->rc.tag, err); 813 if (!err) 814 return req; 815 reterr: 816 p9_tag_remove(c, req); 817 return ERR_PTR(safe_errno(err)); 818 } 819 820 /** 821 * p9_client_zc_rpc - issue a request and wait for a response 822 * @c: client session 823 * @type: type of request 824 * @uidata: destination for zero copy read 825 * @uodata: source for zero copy write 826 * @inlen: read buffer size 827 * @olen: write buffer size 828 * @hdrlen: reader header size, This is the size of response protocol data 829 * @fmt: protocol format string (see protocol.c) 830 * 831 * Returns request structure (which client must free using p9_tag_remove) 832 */ 833 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 834 struct iov_iter *uidata, 835 struct iov_iter *uodata, 836 int inlen, int olen, int in_hdrlen, 837 const char *fmt, ...) 838 { 839 va_list ap; 840 int sigpending, err; 841 unsigned long flags; 842 struct p9_req_t *req; 843 844 va_start(ap, fmt); 845 /* 846 * We allocate a inline protocol data of only 4k bytes. 847 * The actual content is passed in zero-copy fashion. 848 */ 849 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); 850 va_end(ap); 851 if (IS_ERR(req)) 852 return req; 853 854 if (signal_pending(current)) { 855 sigpending = 1; 856 clear_thread_flag(TIF_SIGPENDING); 857 } else 858 sigpending = 0; 859 860 err = c->trans_mod->zc_request(c, req, uidata, uodata, 861 inlen, olen, in_hdrlen); 862 if (err < 0) { 863 if (err == -EIO) 864 c->status = Disconnected; 865 if (err != -ERESTARTSYS) 866 goto recalc_sigpending; 867 } 868 if (req->status == REQ_STATUS_ERROR) { 869 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 870 err = req->t_err; 871 } 872 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 873 p9_debug(P9_DEBUG_MUX, "flushing\n"); 874 sigpending = 1; 875 clear_thread_flag(TIF_SIGPENDING); 876 877 if (c->trans_mod->cancel(c, req)) 878 p9_client_flush(c, req); 879 880 /* if we received the response anyway, don't signal error */ 881 if (req->status == REQ_STATUS_RCVD) 882 err = 0; 883 } 884 recalc_sigpending: 885 if (sigpending) { 886 spin_lock_irqsave(¤t->sighand->siglock, flags); 887 recalc_sigpending(); 888 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 889 } 890 if (err < 0) 891 goto reterr; 892 893 err = p9_check_zc_errors(c, req, uidata, in_hdrlen); 894 trace_9p_client_res(c, type, req->rc.tag, err); 895 if (!err) 896 return req; 897 reterr: 898 p9_tag_remove(c, req); 899 return ERR_PTR(safe_errno(err)); 900 } 901 902 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 903 { 904 int ret; 905 struct p9_fid *fid; 906 907 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 908 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 909 if (!fid) 910 return NULL; 911 912 memset(&fid->qid, 0, sizeof(struct p9_qid)); 913 fid->mode = -1; 914 fid->uid = current_fsuid(); 915 fid->clnt = clnt; 916 fid->rdir = NULL; 917 fid->fid = 0; 918 919 idr_preload(GFP_KERNEL); 920 spin_lock_irq(&clnt->lock); 921 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, 922 GFP_NOWAIT); 923 spin_unlock_irq(&clnt->lock); 924 idr_preload_end(); 925 926 if (!ret) 927 return fid; 928 929 kfree(fid); 930 return NULL; 931 } 932 933 static void p9_fid_destroy(struct p9_fid *fid) 934 { 935 struct p9_client *clnt; 936 unsigned long flags; 937 938 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 939 clnt = fid->clnt; 940 spin_lock_irqsave(&clnt->lock, flags); 941 idr_remove(&clnt->fids, fid->fid); 942 spin_unlock_irqrestore(&clnt->lock, flags); 943 kfree(fid->rdir); 944 kfree(fid); 945 } 946 947 static int p9_client_version(struct p9_client *c) 948 { 949 int err = 0; 950 struct p9_req_t *req; 951 char *version = NULL; 952 int msize; 953 954 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 955 c->msize, c->proto_version); 956 957 switch (c->proto_version) { 958 case p9_proto_2000L: 959 req = p9_client_rpc(c, P9_TVERSION, "ds", 960 c->msize, "9P2000.L"); 961 break; 962 case p9_proto_2000u: 963 req = p9_client_rpc(c, P9_TVERSION, "ds", 964 c->msize, "9P2000.u"); 965 break; 966 case p9_proto_legacy: 967 req = p9_client_rpc(c, P9_TVERSION, "ds", 968 c->msize, "9P2000"); 969 break; 970 default: 971 return -EINVAL; 972 } 973 974 if (IS_ERR(req)) 975 return PTR_ERR(req); 976 977 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); 978 if (err) { 979 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 980 trace_9p_protocol_dump(c, &req->rc); 981 goto error; 982 } 983 984 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 985 if (!strncmp(version, "9P2000.L", 8)) 986 c->proto_version = p9_proto_2000L; 987 else if (!strncmp(version, "9P2000.u", 8)) 988 c->proto_version = p9_proto_2000u; 989 else if (!strncmp(version, "9P2000", 6)) 990 c->proto_version = p9_proto_legacy; 991 else { 992 p9_debug(P9_DEBUG_ERROR, 993 "server returned an unknown version: %s\n", version); 994 err = -EREMOTEIO; 995 goto error; 996 } 997 998 if (msize < 4096) { 999 p9_debug(P9_DEBUG_ERROR, 1000 "server returned a msize < 4096: %d\n", msize); 1001 err = -EREMOTEIO; 1002 goto error; 1003 } 1004 if (msize < c->msize) 1005 c->msize = msize; 1006 1007 error: 1008 kfree(version); 1009 p9_tag_remove(c, req); 1010 1011 return err; 1012 } 1013 1014 struct p9_client *p9_client_create(const char *dev_name, char *options) 1015 { 1016 int err; 1017 struct p9_client *clnt; 1018 char *client_id; 1019 1020 err = 0; 1021 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 1022 if (!clnt) 1023 return ERR_PTR(-ENOMEM); 1024 1025 clnt->trans_mod = NULL; 1026 clnt->trans = NULL; 1027 clnt->fcall_cache = NULL; 1028 1029 client_id = utsname()->nodename; 1030 memcpy(clnt->name, client_id, strlen(client_id) + 1); 1031 1032 spin_lock_init(&clnt->lock); 1033 idr_init(&clnt->fids); 1034 idr_init(&clnt->reqs); 1035 1036 err = parse_opts(options, clnt); 1037 if (err < 0) 1038 goto free_client; 1039 1040 if (!clnt->trans_mod) 1041 clnt->trans_mod = v9fs_get_default_trans(); 1042 1043 if (clnt->trans_mod == NULL) { 1044 err = -EPROTONOSUPPORT; 1045 p9_debug(P9_DEBUG_ERROR, 1046 "No transport defined or default transport\n"); 1047 goto free_client; 1048 } 1049 1050 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1051 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1052 1053 err = clnt->trans_mod->create(clnt, dev_name, options); 1054 if (err) 1055 goto put_trans; 1056 1057 if (clnt->msize > clnt->trans_mod->maxsize) 1058 clnt->msize = clnt->trans_mod->maxsize; 1059 1060 if (clnt->msize < 4096) { 1061 p9_debug(P9_DEBUG_ERROR, 1062 "Please specify a msize of at least 4k\n"); 1063 err = -EINVAL; 1064 goto close_trans; 1065 } 1066 1067 err = p9_client_version(clnt); 1068 if (err) 1069 goto close_trans; 1070 1071 /* P9_HDRSZ + 4 is the smallest packet header we can have that is 1072 * followed by data accessed from userspace by read 1073 */ 1074 clnt->fcall_cache = 1075 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, 1076 0, 0, P9_HDRSZ + 4, 1077 clnt->msize - (P9_HDRSZ + 4), 1078 NULL); 1079 1080 return clnt; 1081 1082 close_trans: 1083 clnt->trans_mod->close(clnt); 1084 put_trans: 1085 v9fs_put_trans(clnt->trans_mod); 1086 free_client: 1087 kfree(clnt); 1088 return ERR_PTR(err); 1089 } 1090 EXPORT_SYMBOL(p9_client_create); 1091 1092 void p9_client_destroy(struct p9_client *clnt) 1093 { 1094 struct p9_fid *fid; 1095 int id; 1096 1097 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1098 1099 if (clnt->trans_mod) 1100 clnt->trans_mod->close(clnt); 1101 1102 v9fs_put_trans(clnt->trans_mod); 1103 1104 idr_for_each_entry(&clnt->fids, fid, id) { 1105 pr_info("Found fid %d not clunked\n", fid->fid); 1106 p9_fid_destroy(fid); 1107 } 1108 1109 p9_tag_cleanup(clnt); 1110 1111 kmem_cache_destroy(clnt->fcall_cache); 1112 kfree(clnt); 1113 } 1114 EXPORT_SYMBOL(p9_client_destroy); 1115 1116 void p9_client_disconnect(struct p9_client *clnt) 1117 { 1118 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1119 clnt->status = Disconnected; 1120 } 1121 EXPORT_SYMBOL(p9_client_disconnect); 1122 1123 void p9_client_begin_disconnect(struct p9_client *clnt) 1124 { 1125 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1126 clnt->status = BeginDisconnect; 1127 } 1128 EXPORT_SYMBOL(p9_client_begin_disconnect); 1129 1130 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1131 const char *uname, kuid_t n_uname, const char *aname) 1132 { 1133 int err = 0; 1134 struct p9_req_t *req; 1135 struct p9_fid *fid; 1136 struct p9_qid qid; 1137 1138 1139 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1140 afid ? afid->fid : -1, uname, aname); 1141 fid = p9_fid_create(clnt); 1142 if (!fid) { 1143 err = -ENOMEM; 1144 goto error; 1145 } 1146 fid->uid = n_uname; 1147 1148 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1149 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1150 if (IS_ERR(req)) { 1151 err = PTR_ERR(req); 1152 goto error; 1153 } 1154 1155 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); 1156 if (err) { 1157 trace_9p_protocol_dump(clnt, &req->rc); 1158 p9_tag_remove(clnt, req); 1159 goto error; 1160 } 1161 1162 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1163 qid.type, (unsigned long long)qid.path, qid.version); 1164 1165 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1166 1167 p9_tag_remove(clnt, req); 1168 return fid; 1169 1170 error: 1171 if (fid) 1172 p9_fid_destroy(fid); 1173 return ERR_PTR(err); 1174 } 1175 EXPORT_SYMBOL(p9_client_attach); 1176 1177 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1178 const unsigned char * const *wnames, int clone) 1179 { 1180 int err; 1181 struct p9_client *clnt; 1182 struct p9_fid *fid; 1183 struct p9_qid *wqids; 1184 struct p9_req_t *req; 1185 uint16_t nwqids, count; 1186 1187 err = 0; 1188 wqids = NULL; 1189 clnt = oldfid->clnt; 1190 if (clone) { 1191 fid = p9_fid_create(clnt); 1192 if (!fid) { 1193 err = -ENOMEM; 1194 goto error; 1195 } 1196 1197 fid->uid = oldfid->uid; 1198 } else 1199 fid = oldfid; 1200 1201 1202 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1203 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1204 1205 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1206 nwname, wnames); 1207 if (IS_ERR(req)) { 1208 err = PTR_ERR(req); 1209 goto error; 1210 } 1211 1212 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1213 if (err) { 1214 trace_9p_protocol_dump(clnt, &req->rc); 1215 p9_tag_remove(clnt, req); 1216 goto clunk_fid; 1217 } 1218 p9_tag_remove(clnt, req); 1219 1220 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1221 1222 if (nwqids != nwname) { 1223 err = -ENOENT; 1224 goto clunk_fid; 1225 } 1226 1227 for (count = 0; count < nwqids; count++) 1228 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1229 count, wqids[count].type, 1230 (unsigned long long)wqids[count].path, 1231 wqids[count].version); 1232 1233 if (nwname) 1234 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1235 else 1236 fid->qid = oldfid->qid; 1237 1238 kfree(wqids); 1239 return fid; 1240 1241 clunk_fid: 1242 kfree(wqids); 1243 p9_client_clunk(fid); 1244 fid = NULL; 1245 1246 error: 1247 if (fid && (fid != oldfid)) 1248 p9_fid_destroy(fid); 1249 1250 return ERR_PTR(err); 1251 } 1252 EXPORT_SYMBOL(p9_client_walk); 1253 1254 int p9_client_open(struct p9_fid *fid, int mode) 1255 { 1256 int err; 1257 struct p9_client *clnt; 1258 struct p9_req_t *req; 1259 struct p9_qid qid; 1260 int iounit; 1261 1262 clnt = fid->clnt; 1263 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1264 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1265 err = 0; 1266 1267 if (fid->mode != -1) 1268 return -EINVAL; 1269 1270 if (p9_is_proto_dotl(clnt)) 1271 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1272 else 1273 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1274 if (IS_ERR(req)) { 1275 err = PTR_ERR(req); 1276 goto error; 1277 } 1278 1279 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1280 if (err) { 1281 trace_9p_protocol_dump(clnt, &req->rc); 1282 goto free_and_error; 1283 } 1284 1285 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1286 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1287 (unsigned long long)qid.path, qid.version, iounit); 1288 1289 fid->mode = mode; 1290 fid->iounit = iounit; 1291 1292 free_and_error: 1293 p9_tag_remove(clnt, req); 1294 error: 1295 return err; 1296 } 1297 EXPORT_SYMBOL(p9_client_open); 1298 1299 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode, 1300 kgid_t gid, struct p9_qid *qid) 1301 { 1302 int err = 0; 1303 struct p9_client *clnt; 1304 struct p9_req_t *req; 1305 int iounit; 1306 1307 p9_debug(P9_DEBUG_9P, 1308 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1309 ofid->fid, name, flags, mode, 1310 from_kgid(&init_user_ns, gid)); 1311 clnt = ofid->clnt; 1312 1313 if (ofid->mode != -1) 1314 return -EINVAL; 1315 1316 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1317 mode, gid); 1318 if (IS_ERR(req)) { 1319 err = PTR_ERR(req); 1320 goto error; 1321 } 1322 1323 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); 1324 if (err) { 1325 trace_9p_protocol_dump(clnt, &req->rc); 1326 goto free_and_error; 1327 } 1328 1329 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1330 qid->type, 1331 (unsigned long long)qid->path, 1332 qid->version, iounit); 1333 1334 ofid->mode = mode; 1335 ofid->iounit = iounit; 1336 1337 free_and_error: 1338 p9_tag_remove(clnt, req); 1339 error: 1340 return err; 1341 } 1342 EXPORT_SYMBOL(p9_client_create_dotl); 1343 1344 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1345 char *extension) 1346 { 1347 int err; 1348 struct p9_client *clnt; 1349 struct p9_req_t *req; 1350 struct p9_qid qid; 1351 int iounit; 1352 1353 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1354 fid->fid, name, perm, mode); 1355 err = 0; 1356 clnt = fid->clnt; 1357 1358 if (fid->mode != -1) 1359 return -EINVAL; 1360 1361 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1362 mode, extension); 1363 if (IS_ERR(req)) { 1364 err = PTR_ERR(req); 1365 goto error; 1366 } 1367 1368 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1369 if (err) { 1370 trace_9p_protocol_dump(clnt, &req->rc); 1371 goto free_and_error; 1372 } 1373 1374 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1375 qid.type, 1376 (unsigned long long)qid.path, 1377 qid.version, iounit); 1378 1379 fid->mode = mode; 1380 fid->iounit = iounit; 1381 1382 free_and_error: 1383 p9_tag_remove(clnt, req); 1384 error: 1385 return err; 1386 } 1387 EXPORT_SYMBOL(p9_client_fcreate); 1388 1389 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1390 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1391 { 1392 int err = 0; 1393 struct p9_client *clnt; 1394 struct p9_req_t *req; 1395 1396 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1397 dfid->fid, name, symtgt); 1398 clnt = dfid->clnt; 1399 1400 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1401 gid); 1402 if (IS_ERR(req)) { 1403 err = PTR_ERR(req); 1404 goto error; 1405 } 1406 1407 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 1408 if (err) { 1409 trace_9p_protocol_dump(clnt, &req->rc); 1410 goto free_and_error; 1411 } 1412 1413 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1414 qid->type, (unsigned long long)qid->path, qid->version); 1415 1416 free_and_error: 1417 p9_tag_remove(clnt, req); 1418 error: 1419 return err; 1420 } 1421 EXPORT_SYMBOL(p9_client_symlink); 1422 1423 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1424 { 1425 struct p9_client *clnt; 1426 struct p9_req_t *req; 1427 1428 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1429 dfid->fid, oldfid->fid, newname); 1430 clnt = dfid->clnt; 1431 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1432 newname); 1433 if (IS_ERR(req)) 1434 return PTR_ERR(req); 1435 1436 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1437 p9_tag_remove(clnt, req); 1438 return 0; 1439 } 1440 EXPORT_SYMBOL(p9_client_link); 1441 1442 int p9_client_fsync(struct p9_fid *fid, int datasync) 1443 { 1444 int err; 1445 struct p9_client *clnt; 1446 struct p9_req_t *req; 1447 1448 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1449 fid->fid, datasync); 1450 err = 0; 1451 clnt = fid->clnt; 1452 1453 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1454 if (IS_ERR(req)) { 1455 err = PTR_ERR(req); 1456 goto error; 1457 } 1458 1459 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1460 1461 p9_tag_remove(clnt, req); 1462 1463 error: 1464 return err; 1465 } 1466 EXPORT_SYMBOL(p9_client_fsync); 1467 1468 int p9_client_clunk(struct p9_fid *fid) 1469 { 1470 int err; 1471 struct p9_client *clnt; 1472 struct p9_req_t *req; 1473 int retries = 0; 1474 1475 if (!fid) { 1476 pr_warn("%s (%d): Trying to clunk with NULL fid\n", 1477 __func__, task_pid_nr(current)); 1478 dump_stack(); 1479 return 0; 1480 } 1481 1482 again: 1483 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid, 1484 retries); 1485 err = 0; 1486 clnt = fid->clnt; 1487 1488 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1489 if (IS_ERR(req)) { 1490 err = PTR_ERR(req); 1491 goto error; 1492 } 1493 1494 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1495 1496 p9_tag_remove(clnt, req); 1497 error: 1498 /* 1499 * Fid is not valid even after a failed clunk 1500 * If interrupted, retry once then give up and 1501 * leak fid until umount. 1502 */ 1503 if (err == -ERESTARTSYS) { 1504 if (retries++ == 0) 1505 goto again; 1506 } else 1507 p9_fid_destroy(fid); 1508 return err; 1509 } 1510 EXPORT_SYMBOL(p9_client_clunk); 1511 1512 int p9_client_remove(struct p9_fid *fid) 1513 { 1514 int err; 1515 struct p9_client *clnt; 1516 struct p9_req_t *req; 1517 1518 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1519 err = 0; 1520 clnt = fid->clnt; 1521 1522 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1523 if (IS_ERR(req)) { 1524 err = PTR_ERR(req); 1525 goto error; 1526 } 1527 1528 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1529 1530 p9_tag_remove(clnt, req); 1531 error: 1532 if (err == -ERESTARTSYS) 1533 p9_client_clunk(fid); 1534 else 1535 p9_fid_destroy(fid); 1536 return err; 1537 } 1538 EXPORT_SYMBOL(p9_client_remove); 1539 1540 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1541 { 1542 int err = 0; 1543 struct p9_req_t *req; 1544 struct p9_client *clnt; 1545 1546 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1547 dfid->fid, name, flags); 1548 1549 clnt = dfid->clnt; 1550 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1551 if (IS_ERR(req)) { 1552 err = PTR_ERR(req); 1553 goto error; 1554 } 1555 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1556 1557 p9_tag_remove(clnt, req); 1558 error: 1559 return err; 1560 } 1561 EXPORT_SYMBOL(p9_client_unlinkat); 1562 1563 int 1564 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1565 { 1566 struct p9_client *clnt = fid->clnt; 1567 struct p9_req_t *req; 1568 int total = 0; 1569 *err = 0; 1570 1571 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", 1572 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to)); 1573 1574 while (iov_iter_count(to)) { 1575 int count = iov_iter_count(to); 1576 int rsize, non_zc = 0; 1577 char *dataptr; 1578 1579 rsize = fid->iounit; 1580 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1581 rsize = clnt->msize - P9_IOHDRSZ; 1582 1583 if (count < rsize) 1584 rsize = count; 1585 1586 /* Don't bother zerocopy for small IO (< 1024) */ 1587 if (clnt->trans_mod->zc_request && rsize > 1024) { 1588 /* 1589 * response header len is 11 1590 * PDU Header(7) + IO Size (4) 1591 */ 1592 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1593 0, 11, "dqd", fid->fid, 1594 offset, rsize); 1595 } else { 1596 non_zc = 1; 1597 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1598 rsize); 1599 } 1600 if (IS_ERR(req)) { 1601 *err = PTR_ERR(req); 1602 break; 1603 } 1604 1605 *err = p9pdu_readf(&req->rc, clnt->proto_version, 1606 "D", &count, &dataptr); 1607 if (*err) { 1608 trace_9p_protocol_dump(clnt, &req->rc); 1609 p9_tag_remove(clnt, req); 1610 break; 1611 } 1612 if (rsize < count) { 1613 pr_err("bogus RREAD count (%d > %d)\n", count, rsize); 1614 count = rsize; 1615 } 1616 1617 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1618 if (!count) { 1619 p9_tag_remove(clnt, req); 1620 break; 1621 } 1622 1623 if (non_zc) { 1624 int n = copy_to_iter(dataptr, count, to); 1625 total += n; 1626 offset += n; 1627 if (n != count) { 1628 *err = -EFAULT; 1629 p9_tag_remove(clnt, req); 1630 break; 1631 } 1632 } else { 1633 iov_iter_advance(to, count); 1634 total += count; 1635 offset += count; 1636 } 1637 p9_tag_remove(clnt, req); 1638 } 1639 return total; 1640 } 1641 EXPORT_SYMBOL(p9_client_read); 1642 1643 int 1644 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1645 { 1646 struct p9_client *clnt = fid->clnt; 1647 struct p9_req_t *req; 1648 int total = 0; 1649 *err = 0; 1650 1651 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", 1652 fid->fid, (unsigned long long) offset, 1653 iov_iter_count(from)); 1654 1655 while (iov_iter_count(from)) { 1656 int count = iov_iter_count(from); 1657 int rsize = fid->iounit; 1658 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1659 rsize = clnt->msize - P9_IOHDRSZ; 1660 1661 if (count < rsize) 1662 rsize = count; 1663 1664 /* Don't bother zerocopy for small IO (< 1024) */ 1665 if (clnt->trans_mod->zc_request && rsize > 1024) { 1666 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1667 rsize, P9_ZC_HDR_SZ, "dqd", 1668 fid->fid, offset, rsize); 1669 } else { 1670 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1671 offset, rsize, from); 1672 } 1673 if (IS_ERR(req)) { 1674 *err = PTR_ERR(req); 1675 break; 1676 } 1677 1678 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count); 1679 if (*err) { 1680 trace_9p_protocol_dump(clnt, &req->rc); 1681 p9_tag_remove(clnt, req); 1682 break; 1683 } 1684 if (rsize < count) { 1685 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize); 1686 count = rsize; 1687 } 1688 1689 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1690 1691 p9_tag_remove(clnt, req); 1692 iov_iter_advance(from, count); 1693 total += count; 1694 offset += count; 1695 } 1696 return total; 1697 } 1698 EXPORT_SYMBOL(p9_client_write); 1699 1700 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1701 { 1702 int err; 1703 struct p9_client *clnt; 1704 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1705 struct p9_req_t *req; 1706 u16 ignored; 1707 1708 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1709 1710 if (!ret) 1711 return ERR_PTR(-ENOMEM); 1712 1713 err = 0; 1714 clnt = fid->clnt; 1715 1716 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1717 if (IS_ERR(req)) { 1718 err = PTR_ERR(req); 1719 goto error; 1720 } 1721 1722 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); 1723 if (err) { 1724 trace_9p_protocol_dump(clnt, &req->rc); 1725 p9_tag_remove(clnt, req); 1726 goto error; 1727 } 1728 1729 p9_debug(P9_DEBUG_9P, 1730 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1731 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1732 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1733 "<<< uid=%d gid=%d n_muid=%d\n", 1734 ret->size, ret->type, ret->dev, ret->qid.type, 1735 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1736 ret->atime, ret->mtime, (unsigned long long)ret->length, 1737 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1738 from_kuid(&init_user_ns, ret->n_uid), 1739 from_kgid(&init_user_ns, ret->n_gid), 1740 from_kuid(&init_user_ns, ret->n_muid)); 1741 1742 p9_tag_remove(clnt, req); 1743 return ret; 1744 1745 error: 1746 kfree(ret); 1747 return ERR_PTR(err); 1748 } 1749 EXPORT_SYMBOL(p9_client_stat); 1750 1751 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1752 u64 request_mask) 1753 { 1754 int err; 1755 struct p9_client *clnt; 1756 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1757 GFP_KERNEL); 1758 struct p9_req_t *req; 1759 1760 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1761 fid->fid, request_mask); 1762 1763 if (!ret) 1764 return ERR_PTR(-ENOMEM); 1765 1766 err = 0; 1767 clnt = fid->clnt; 1768 1769 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1770 if (IS_ERR(req)) { 1771 err = PTR_ERR(req); 1772 goto error; 1773 } 1774 1775 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); 1776 if (err) { 1777 trace_9p_protocol_dump(clnt, &req->rc); 1778 p9_tag_remove(clnt, req); 1779 goto error; 1780 } 1781 1782 p9_debug(P9_DEBUG_9P, 1783 "<<< RGETATTR st_result_mask=%lld\n" 1784 "<<< qid=%x.%llx.%x\n" 1785 "<<< st_mode=%8.8x st_nlink=%llu\n" 1786 "<<< st_uid=%d st_gid=%d\n" 1787 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1788 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1789 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1790 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1791 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1792 "<<< st_gen=%lld st_data_version=%lld\n", 1793 ret->st_result_mask, ret->qid.type, ret->qid.path, 1794 ret->qid.version, ret->st_mode, ret->st_nlink, 1795 from_kuid(&init_user_ns, ret->st_uid), 1796 from_kgid(&init_user_ns, ret->st_gid), 1797 ret->st_rdev, ret->st_size, ret->st_blksize, 1798 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1799 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1800 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1801 ret->st_gen, ret->st_data_version); 1802 1803 p9_tag_remove(clnt, req); 1804 return ret; 1805 1806 error: 1807 kfree(ret); 1808 return ERR_PTR(err); 1809 } 1810 EXPORT_SYMBOL(p9_client_getattr_dotl); 1811 1812 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1813 { 1814 int ret; 1815 1816 /* NOTE: size shouldn't include its own length */ 1817 /* size[2] type[2] dev[4] qid[13] */ 1818 /* mode[4] atime[4] mtime[4] length[8]*/ 1819 /* name[s] uid[s] gid[s] muid[s] */ 1820 ret = 2+4+13+4+4+4+8+2+2+2+2; 1821 1822 if (wst->name) 1823 ret += strlen(wst->name); 1824 if (wst->uid) 1825 ret += strlen(wst->uid); 1826 if (wst->gid) 1827 ret += strlen(wst->gid); 1828 if (wst->muid) 1829 ret += strlen(wst->muid); 1830 1831 if ((proto_version == p9_proto_2000u) || 1832 (proto_version == p9_proto_2000L)) { 1833 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1834 if (wst->extension) 1835 ret += strlen(wst->extension); 1836 } 1837 1838 return ret; 1839 } 1840 1841 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1842 { 1843 int err; 1844 struct p9_req_t *req; 1845 struct p9_client *clnt; 1846 1847 err = 0; 1848 clnt = fid->clnt; 1849 wst->size = p9_client_statsize(wst, clnt->proto_version); 1850 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1851 p9_debug(P9_DEBUG_9P, 1852 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1853 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1854 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1855 " uid=%d gid=%d n_muid=%d\n", 1856 wst->size, wst->type, wst->dev, wst->qid.type, 1857 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1858 wst->atime, wst->mtime, (unsigned long long)wst->length, 1859 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1860 from_kuid(&init_user_ns, wst->n_uid), 1861 from_kgid(&init_user_ns, wst->n_gid), 1862 from_kuid(&init_user_ns, wst->n_muid)); 1863 1864 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1865 if (IS_ERR(req)) { 1866 err = PTR_ERR(req); 1867 goto error; 1868 } 1869 1870 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1871 1872 p9_tag_remove(clnt, req); 1873 error: 1874 return err; 1875 } 1876 EXPORT_SYMBOL(p9_client_wstat); 1877 1878 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1879 { 1880 int err; 1881 struct p9_req_t *req; 1882 struct p9_client *clnt; 1883 1884 err = 0; 1885 clnt = fid->clnt; 1886 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1887 p9_debug(P9_DEBUG_9P, 1888 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1889 " atime_sec=%lld atime_nsec=%lld\n" 1890 " mtime_sec=%lld mtime_nsec=%lld\n", 1891 p9attr->valid, p9attr->mode, 1892 from_kuid(&init_user_ns, p9attr->uid), 1893 from_kgid(&init_user_ns, p9attr->gid), 1894 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1895 p9attr->mtime_sec, p9attr->mtime_nsec); 1896 1897 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1898 1899 if (IS_ERR(req)) { 1900 err = PTR_ERR(req); 1901 goto error; 1902 } 1903 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1904 p9_tag_remove(clnt, req); 1905 error: 1906 return err; 1907 } 1908 EXPORT_SYMBOL(p9_client_setattr); 1909 1910 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1911 { 1912 int err; 1913 struct p9_req_t *req; 1914 struct p9_client *clnt; 1915 1916 err = 0; 1917 clnt = fid->clnt; 1918 1919 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1920 1921 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1922 if (IS_ERR(req)) { 1923 err = PTR_ERR(req); 1924 goto error; 1925 } 1926 1927 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1928 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1929 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1930 if (err) { 1931 trace_9p_protocol_dump(clnt, &req->rc); 1932 p9_tag_remove(clnt, req); 1933 goto error; 1934 } 1935 1936 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1937 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1938 "fsid %llu namelen %ld\n", 1939 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1940 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1941 sb->fsid, (long int)sb->namelen); 1942 1943 p9_tag_remove(clnt, req); 1944 error: 1945 return err; 1946 } 1947 EXPORT_SYMBOL(p9_client_statfs); 1948 1949 int p9_client_rename(struct p9_fid *fid, 1950 struct p9_fid *newdirfid, const char *name) 1951 { 1952 int err; 1953 struct p9_req_t *req; 1954 struct p9_client *clnt; 1955 1956 err = 0; 1957 clnt = fid->clnt; 1958 1959 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1960 fid->fid, newdirfid->fid, name); 1961 1962 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1963 newdirfid->fid, name); 1964 if (IS_ERR(req)) { 1965 err = PTR_ERR(req); 1966 goto error; 1967 } 1968 1969 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1970 1971 p9_tag_remove(clnt, req); 1972 error: 1973 return err; 1974 } 1975 EXPORT_SYMBOL(p9_client_rename); 1976 1977 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1978 struct p9_fid *newdirfid, const char *new_name) 1979 { 1980 int err; 1981 struct p9_req_t *req; 1982 struct p9_client *clnt; 1983 1984 err = 0; 1985 clnt = olddirfid->clnt; 1986 1987 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" 1988 " newdirfid %d new name %s\n", olddirfid->fid, old_name, 1989 newdirfid->fid, new_name); 1990 1991 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1992 old_name, newdirfid->fid, new_name); 1993 if (IS_ERR(req)) { 1994 err = PTR_ERR(req); 1995 goto error; 1996 } 1997 1998 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1999 newdirfid->fid, new_name); 2000 2001 p9_tag_remove(clnt, req); 2002 error: 2003 return err; 2004 } 2005 EXPORT_SYMBOL(p9_client_renameat); 2006 2007 /* 2008 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 2009 */ 2010 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 2011 const char *attr_name, u64 *attr_size) 2012 { 2013 int err; 2014 struct p9_req_t *req; 2015 struct p9_client *clnt; 2016 struct p9_fid *attr_fid; 2017 2018 err = 0; 2019 clnt = file_fid->clnt; 2020 attr_fid = p9_fid_create(clnt); 2021 if (!attr_fid) { 2022 err = -ENOMEM; 2023 goto error; 2024 } 2025 p9_debug(P9_DEBUG_9P, 2026 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 2027 file_fid->fid, attr_fid->fid, attr_name); 2028 2029 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 2030 file_fid->fid, attr_fid->fid, attr_name); 2031 if (IS_ERR(req)) { 2032 err = PTR_ERR(req); 2033 goto error; 2034 } 2035 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); 2036 if (err) { 2037 trace_9p_protocol_dump(clnt, &req->rc); 2038 p9_tag_remove(clnt, req); 2039 goto clunk_fid; 2040 } 2041 p9_tag_remove(clnt, req); 2042 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2043 attr_fid->fid, *attr_size); 2044 return attr_fid; 2045 clunk_fid: 2046 p9_client_clunk(attr_fid); 2047 attr_fid = NULL; 2048 error: 2049 if (attr_fid && (attr_fid != file_fid)) 2050 p9_fid_destroy(attr_fid); 2051 2052 return ERR_PTR(err); 2053 } 2054 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2055 2056 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2057 u64 attr_size, int flags) 2058 { 2059 int err; 2060 struct p9_req_t *req; 2061 struct p9_client *clnt; 2062 2063 p9_debug(P9_DEBUG_9P, 2064 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 2065 fid->fid, name, (long long)attr_size, flags); 2066 err = 0; 2067 clnt = fid->clnt; 2068 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2069 fid->fid, name, attr_size, flags); 2070 if (IS_ERR(req)) { 2071 err = PTR_ERR(req); 2072 goto error; 2073 } 2074 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2075 p9_tag_remove(clnt, req); 2076 error: 2077 return err; 2078 } 2079 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2080 2081 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2082 { 2083 int err, rsize, non_zc = 0; 2084 struct p9_client *clnt; 2085 struct p9_req_t *req; 2086 char *dataptr; 2087 struct kvec kv = {.iov_base = data, .iov_len = count}; 2088 struct iov_iter to; 2089 2090 iov_iter_kvec(&to, READ, &kv, 1, count); 2091 2092 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2093 fid->fid, (unsigned long long) offset, count); 2094 2095 err = 0; 2096 clnt = fid->clnt; 2097 2098 rsize = fid->iounit; 2099 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 2100 rsize = clnt->msize - P9_READDIRHDRSZ; 2101 2102 if (count < rsize) 2103 rsize = count; 2104 2105 /* Don't bother zerocopy for small IO (< 1024) */ 2106 if (clnt->trans_mod->zc_request && rsize > 1024) { 2107 /* 2108 * response header len is 11 2109 * PDU Header(7) + IO Size (4) 2110 */ 2111 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2112 11, "dqd", fid->fid, offset, rsize); 2113 } else { 2114 non_zc = 1; 2115 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2116 offset, rsize); 2117 } 2118 if (IS_ERR(req)) { 2119 err = PTR_ERR(req); 2120 goto error; 2121 } 2122 2123 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); 2124 if (err) { 2125 trace_9p_protocol_dump(clnt, &req->rc); 2126 goto free_and_error; 2127 } 2128 if (rsize < count) { 2129 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2130 count = rsize; 2131 } 2132 2133 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2134 2135 if (non_zc) 2136 memmove(data, dataptr, count); 2137 2138 p9_tag_remove(clnt, req); 2139 return count; 2140 2141 free_and_error: 2142 p9_tag_remove(clnt, req); 2143 error: 2144 return err; 2145 } 2146 EXPORT_SYMBOL(p9_client_readdir); 2147 2148 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2149 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2150 { 2151 int err; 2152 struct p9_client *clnt; 2153 struct p9_req_t *req; 2154 2155 err = 0; 2156 clnt = fid->clnt; 2157 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 2158 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2159 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2160 MAJOR(rdev), MINOR(rdev), gid); 2161 if (IS_ERR(req)) 2162 return PTR_ERR(req); 2163 2164 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2165 if (err) { 2166 trace_9p_protocol_dump(clnt, &req->rc); 2167 goto error; 2168 } 2169 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 2170 (unsigned long long)qid->path, qid->version); 2171 2172 error: 2173 p9_tag_remove(clnt, req); 2174 return err; 2175 2176 } 2177 EXPORT_SYMBOL(p9_client_mknod_dotl); 2178 2179 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2180 kgid_t gid, struct p9_qid *qid) 2181 { 2182 int err; 2183 struct p9_client *clnt; 2184 struct p9_req_t *req; 2185 2186 err = 0; 2187 clnt = fid->clnt; 2188 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2189 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2190 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode, 2191 gid); 2192 if (IS_ERR(req)) 2193 return PTR_ERR(req); 2194 2195 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2196 if (err) { 2197 trace_9p_protocol_dump(clnt, &req->rc); 2198 goto error; 2199 } 2200 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2201 (unsigned long long)qid->path, qid->version); 2202 2203 error: 2204 p9_tag_remove(clnt, req); 2205 return err; 2206 2207 } 2208 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2209 2210 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2211 { 2212 int err; 2213 struct p9_client *clnt; 2214 struct p9_req_t *req; 2215 2216 err = 0; 2217 clnt = fid->clnt; 2218 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " 2219 "start %lld length %lld proc_id %d client_id %s\n", 2220 fid->fid, flock->type, flock->flags, flock->start, 2221 flock->length, flock->proc_id, flock->client_id); 2222 2223 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2224 flock->flags, flock->start, flock->length, 2225 flock->proc_id, flock->client_id); 2226 2227 if (IS_ERR(req)) 2228 return PTR_ERR(req); 2229 2230 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); 2231 if (err) { 2232 trace_9p_protocol_dump(clnt, &req->rc); 2233 goto error; 2234 } 2235 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2236 error: 2237 p9_tag_remove(clnt, req); 2238 return err; 2239 2240 } 2241 EXPORT_SYMBOL(p9_client_lock_dotl); 2242 2243 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2244 { 2245 int err; 2246 struct p9_client *clnt; 2247 struct p9_req_t *req; 2248 2249 err = 0; 2250 clnt = fid->clnt; 2251 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " 2252 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, 2253 glock->start, glock->length, glock->proc_id, glock->client_id); 2254 2255 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, 2256 glock->start, glock->length, glock->proc_id, glock->client_id); 2257 2258 if (IS_ERR(req)) 2259 return PTR_ERR(req); 2260 2261 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, 2262 &glock->start, &glock->length, &glock->proc_id, 2263 &glock->client_id); 2264 if (err) { 2265 trace_9p_protocol_dump(clnt, &req->rc); 2266 goto error; 2267 } 2268 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " 2269 "proc_id %d client_id %s\n", glock->type, glock->start, 2270 glock->length, glock->proc_id, glock->client_id); 2271 error: 2272 p9_tag_remove(clnt, req); 2273 return err; 2274 } 2275 EXPORT_SYMBOL(p9_client_getlock_dotl); 2276 2277 int p9_client_readlink(struct p9_fid *fid, char **target) 2278 { 2279 int err; 2280 struct p9_client *clnt; 2281 struct p9_req_t *req; 2282 2283 err = 0; 2284 clnt = fid->clnt; 2285 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2286 2287 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2288 if (IS_ERR(req)) 2289 return PTR_ERR(req); 2290 2291 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); 2292 if (err) { 2293 trace_9p_protocol_dump(clnt, &req->rc); 2294 goto error; 2295 } 2296 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2297 error: 2298 p9_tag_remove(clnt, req); 2299 return err; 2300 } 2301 EXPORT_SYMBOL(p9_client_readlink); 2302 2303 int __init p9_client_init(void) 2304 { 2305 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); 2306 return p9_req_cache ? 0 : -ENOMEM; 2307 } 2308 2309 void __exit p9_client_exit(void) 2310 { 2311 kmem_cache_destroy(p9_req_cache); 2312 } 2313