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 #include <linux/module.h> 27 #include <linux/errno.h> 28 #include <linux/fs.h> 29 #include <linux/poll.h> 30 #include <linux/idr.h> 31 #include <linux/mutex.h> 32 #include <linux/slab.h> 33 #include <linux/sched.h> 34 #include <linux/uaccess.h> 35 #include <net/9p/9p.h> 36 #include <linux/parser.h> 37 #include <net/9p/client.h> 38 #include <net/9p/transport.h> 39 #include "protocol.h" 40 41 /* 42 * Client Option Parsing (code inspired by NFS code) 43 * - a little lazy - parse all client options 44 */ 45 46 enum { 47 Opt_msize, 48 Opt_trans, 49 Opt_legacy, 50 Opt_version, 51 Opt_err, 52 }; 53 54 static const match_table_t tokens = { 55 {Opt_msize, "msize=%u"}, 56 {Opt_legacy, "noextend"}, 57 {Opt_trans, "trans=%s"}, 58 {Opt_version, "version=%s"}, 59 {Opt_err, NULL}, 60 }; 61 62 inline int p9_is_proto_dotl(struct p9_client *clnt) 63 { 64 return clnt->proto_version == p9_proto_2000L; 65 } 66 EXPORT_SYMBOL(p9_is_proto_dotl); 67 68 inline int p9_is_proto_dotu(struct p9_client *clnt) 69 { 70 return clnt->proto_version == p9_proto_2000u; 71 } 72 EXPORT_SYMBOL(p9_is_proto_dotu); 73 74 /* Interpret mount option for protocol version */ 75 static int get_protocol_version(const substring_t *name) 76 { 77 int version = -EINVAL; 78 79 if (!strncmp("9p2000", name->from, name->to-name->from)) { 80 version = p9_proto_legacy; 81 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: Legacy\n"); 82 } else if (!strncmp("9p2000.u", name->from, name->to-name->from)) { 83 version = p9_proto_2000u; 84 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); 85 } else if (!strncmp("9p2000.L", name->from, name->to-name->from)) { 86 version = p9_proto_2000L; 87 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); 88 } else { 89 P9_DPRINTK(P9_DEBUG_ERROR, "Unknown protocol version %s. ", 90 name->from); 91 } 92 return version; 93 } 94 95 static struct p9_req_t * 96 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 97 98 /** 99 * parse_options - parse mount options into client structure 100 * @opts: options string passed from mount 101 * @clnt: existing v9fs client information 102 * 103 * Return 0 upon success, -ERRNO upon failure 104 */ 105 106 static int parse_opts(char *opts, struct p9_client *clnt) 107 { 108 char *options, *tmp_options; 109 char *p; 110 substring_t args[MAX_OPT_ARGS]; 111 int option; 112 int ret = 0; 113 114 clnt->proto_version = p9_proto_2000u; 115 clnt->msize = 8192; 116 117 if (!opts) 118 return 0; 119 120 tmp_options = kstrdup(opts, GFP_KERNEL); 121 if (!tmp_options) { 122 P9_DPRINTK(P9_DEBUG_ERROR, 123 "failed to allocate copy of option string\n"); 124 return -ENOMEM; 125 } 126 options = tmp_options; 127 128 while ((p = strsep(&options, ",")) != NULL) { 129 int token; 130 if (!*p) 131 continue; 132 token = match_token(p, tokens, args); 133 if (token < Opt_trans) { 134 int r = match_int(&args[0], &option); 135 if (r < 0) { 136 P9_DPRINTK(P9_DEBUG_ERROR, 137 "integer field, but no integer?\n"); 138 ret = r; 139 continue; 140 } 141 } 142 switch (token) { 143 case Opt_msize: 144 clnt->msize = option; 145 break; 146 case Opt_trans: 147 clnt->trans_mod = v9fs_get_trans_by_name(&args[0]); 148 if(clnt->trans_mod == NULL) { 149 P9_DPRINTK(P9_DEBUG_ERROR, 150 "Could not find request transport: %s\n", 151 (char *) &args[0]); 152 ret = -EINVAL; 153 goto free_and_return; 154 } 155 break; 156 case Opt_legacy: 157 clnt->proto_version = p9_proto_legacy; 158 break; 159 case Opt_version: 160 ret = get_protocol_version(&args[0]); 161 if (ret == -EINVAL) 162 goto free_and_return; 163 clnt->proto_version = ret; 164 break; 165 default: 166 continue; 167 } 168 } 169 170 free_and_return: 171 kfree(tmp_options); 172 return ret; 173 } 174 175 /** 176 * p9_tag_alloc - lookup/allocate a request by tag 177 * @c: client session to lookup tag within 178 * @tag: numeric id for transaction 179 * 180 * this is a simple array lookup, but will grow the 181 * request_slots as necessary to accomodate transaction 182 * ids which did not previously have a slot. 183 * 184 * this code relies on the client spinlock to manage locks, its 185 * possible we should switch to something else, but I'd rather 186 * stick with something low-overhead for the common case. 187 * 188 */ 189 190 static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag) 191 { 192 unsigned long flags; 193 int row, col; 194 struct p9_req_t *req; 195 196 /* This looks up the original request by tag so we know which 197 * buffer to read the data into */ 198 tag++; 199 200 if (tag >= c->max_tag) { 201 spin_lock_irqsave(&c->lock, flags); 202 /* check again since original check was outside of lock */ 203 while (tag >= c->max_tag) { 204 row = (tag / P9_ROW_MAXTAG); 205 c->reqs[row] = kcalloc(P9_ROW_MAXTAG, 206 sizeof(struct p9_req_t), GFP_ATOMIC); 207 208 if (!c->reqs[row]) { 209 printk(KERN_ERR "Couldn't grow tag array\n"); 210 spin_unlock_irqrestore(&c->lock, flags); 211 return ERR_PTR(-ENOMEM); 212 } 213 for (col = 0; col < P9_ROW_MAXTAG; col++) { 214 c->reqs[row][col].status = REQ_STATUS_IDLE; 215 c->reqs[row][col].tc = NULL; 216 } 217 c->max_tag += P9_ROW_MAXTAG; 218 } 219 spin_unlock_irqrestore(&c->lock, flags); 220 } 221 row = tag / P9_ROW_MAXTAG; 222 col = tag % P9_ROW_MAXTAG; 223 224 req = &c->reqs[row][col]; 225 if (!req->tc) { 226 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS); 227 if (!req->wq) { 228 printk(KERN_ERR "Couldn't grow tag array\n"); 229 return ERR_PTR(-ENOMEM); 230 } 231 init_waitqueue_head(req->wq); 232 if ((c->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) == 233 P9_TRANS_PREF_PAYLOAD_SEP) { 234 int alloc_msize = min(c->msize, 4096); 235 req->tc = kmalloc(sizeof(struct p9_fcall)+alloc_msize, 236 GFP_NOFS); 237 req->tc->capacity = alloc_msize; 238 req->rc = kmalloc(sizeof(struct p9_fcall)+alloc_msize, 239 GFP_NOFS); 240 req->rc->capacity = alloc_msize; 241 } else { 242 req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize, 243 GFP_NOFS); 244 req->tc->capacity = c->msize; 245 req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize, 246 GFP_NOFS); 247 req->rc->capacity = c->msize; 248 } 249 if ((!req->tc) || (!req->rc)) { 250 printk(KERN_ERR "Couldn't grow tag array\n"); 251 kfree(req->tc); 252 kfree(req->rc); 253 kfree(req->wq); 254 req->tc = req->rc = NULL; 255 req->wq = NULL; 256 return ERR_PTR(-ENOMEM); 257 } 258 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall); 259 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall); 260 } 261 262 p9pdu_reset(req->tc); 263 p9pdu_reset(req->rc); 264 265 req->tc->tag = tag-1; 266 req->status = REQ_STATUS_ALLOC; 267 268 return &c->reqs[row][col]; 269 } 270 271 /** 272 * p9_tag_lookup - lookup a request by tag 273 * @c: client session to lookup tag within 274 * @tag: numeric id for transaction 275 * 276 */ 277 278 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 279 { 280 int row, col; 281 282 /* This looks up the original request by tag so we know which 283 * buffer to read the data into */ 284 tag++; 285 286 BUG_ON(tag >= c->max_tag); 287 288 row = tag / P9_ROW_MAXTAG; 289 col = tag % P9_ROW_MAXTAG; 290 291 return &c->reqs[row][col]; 292 } 293 EXPORT_SYMBOL(p9_tag_lookup); 294 295 /** 296 * p9_tag_init - setup tags structure and contents 297 * @c: v9fs client struct 298 * 299 * This initializes the tags structure for each client instance. 300 * 301 */ 302 303 static int p9_tag_init(struct p9_client *c) 304 { 305 int err = 0; 306 307 c->tagpool = p9_idpool_create(); 308 if (IS_ERR(c->tagpool)) { 309 err = PTR_ERR(c->tagpool); 310 c->tagpool = NULL; 311 goto error; 312 } 313 314 p9_idpool_get(c->tagpool); /* reserve tag 0 */ 315 316 c->max_tag = 0; 317 error: 318 return err; 319 } 320 321 /** 322 * p9_tag_cleanup - cleans up tags structure and reclaims resources 323 * @c: v9fs client struct 324 * 325 * This frees resources associated with the tags structure 326 * 327 */ 328 static void p9_tag_cleanup(struct p9_client *c) 329 { 330 int row, col; 331 332 /* check to insure all requests are idle */ 333 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 334 for (col = 0; col < P9_ROW_MAXTAG; col++) { 335 if (c->reqs[row][col].status != REQ_STATUS_IDLE) { 336 P9_DPRINTK(P9_DEBUG_MUX, 337 "Attempting to cleanup non-free tag %d,%d\n", 338 row, col); 339 /* TODO: delay execution of cleanup */ 340 return; 341 } 342 } 343 } 344 345 if (c->tagpool) { 346 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */ 347 p9_idpool_destroy(c->tagpool); 348 } 349 350 /* free requests associated with tags */ 351 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 352 for (col = 0; col < P9_ROW_MAXTAG; col++) { 353 kfree(c->reqs[row][col].wq); 354 kfree(c->reqs[row][col].tc); 355 kfree(c->reqs[row][col].rc); 356 } 357 kfree(c->reqs[row]); 358 } 359 c->max_tag = 0; 360 } 361 362 /** 363 * p9_free_req - free a request and clean-up as necessary 364 * c: client state 365 * r: request to release 366 * 367 */ 368 369 static void p9_free_req(struct p9_client *c, struct p9_req_t *r) 370 { 371 int tag = r->tc->tag; 372 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); 373 374 r->status = REQ_STATUS_IDLE; 375 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool)) 376 p9_idpool_put(tag, c->tagpool); 377 } 378 379 /** 380 * p9_client_cb - call back from transport to client 381 * c: client state 382 * req: request received 383 * 384 */ 385 void p9_client_cb(struct p9_client *c, struct p9_req_t *req) 386 { 387 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag); 388 wake_up(req->wq); 389 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag); 390 } 391 EXPORT_SYMBOL(p9_client_cb); 392 393 /** 394 * p9_parse_header - parse header arguments out of a packet 395 * @pdu: packet to parse 396 * @size: size of packet 397 * @type: type of request 398 * @tag: tag of packet 399 * @rewind: set if we need to rewind offset afterwards 400 */ 401 402 int 403 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, 404 int rewind) 405 { 406 int8_t r_type; 407 int16_t r_tag; 408 int32_t r_size; 409 int offset = pdu->offset; 410 int err; 411 412 pdu->offset = 0; 413 if (pdu->size == 0) 414 pdu->size = 7; 415 416 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 417 if (err) 418 goto rewind_and_exit; 419 420 pdu->size = r_size; 421 pdu->id = r_type; 422 pdu->tag = r_tag; 423 424 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size, 425 pdu->id, pdu->tag); 426 427 if (type) 428 *type = r_type; 429 if (tag) 430 *tag = r_tag; 431 if (size) 432 *size = r_size; 433 434 435 rewind_and_exit: 436 if (rewind) 437 pdu->offset = offset; 438 return err; 439 } 440 EXPORT_SYMBOL(p9_parse_header); 441 442 /** 443 * p9_check_errors - check 9p packet for error return and process it 444 * @c: current client instance 445 * @req: request to parse and check for error conditions 446 * 447 * returns error code if one is discovered, otherwise returns 0 448 * 449 * this will have to be more complicated if we have multiple 450 * error packet types 451 */ 452 453 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 454 { 455 int8_t type; 456 int err; 457 int ecode; 458 459 err = p9_parse_header(req->rc, NULL, &type, NULL, 0); 460 if (err) { 461 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 462 return err; 463 } 464 465 if (type != P9_RERROR && type != P9_RLERROR) 466 return 0; 467 468 if (!p9_is_proto_dotl(c)) { 469 char *ename; 470 471 if (req->tc->pbuf_size) { 472 /* Handle user buffers */ 473 size_t len = req->rc->size - req->rc->offset; 474 if (req->tc->pubuf) { 475 /* User Buffer */ 476 err = copy_from_user( 477 &req->rc->sdata[req->rc->offset], 478 req->tc->pubuf, len); 479 if (err) { 480 err = -EFAULT; 481 goto out_err; 482 } 483 } else { 484 /* Kernel Buffer */ 485 memmove(&req->rc->sdata[req->rc->offset], 486 req->tc->pkbuf, len); 487 } 488 } 489 err = p9pdu_readf(req->rc, c->proto_version, "s?d", 490 &ename, &ecode); 491 if (err) 492 goto out_err; 493 494 if (p9_is_proto_dotu(c)) 495 err = -ecode; 496 497 if (!err || !IS_ERR_VALUE(err)) { 498 err = p9_errstr2errno(ename, strlen(ename)); 499 500 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, 501 ename); 502 503 kfree(ename); 504 } 505 } else { 506 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); 507 err = -ecode; 508 509 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 510 } 511 512 513 return err; 514 515 out_err: 516 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 517 518 return err; 519 } 520 521 /** 522 * p9_client_flush - flush (cancel) a request 523 * @c: client state 524 * @oldreq: request to cancel 525 * 526 * This sents a flush for a particular requests and links 527 * the flush request to the original request. The current 528 * code only supports a single flush request although the protocol 529 * allows for multiple flush requests to be sent for a single request. 530 * 531 */ 532 533 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 534 { 535 struct p9_req_t *req; 536 int16_t oldtag; 537 int err; 538 539 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); 540 if (err) 541 return err; 542 543 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 544 545 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 546 if (IS_ERR(req)) 547 return PTR_ERR(req); 548 549 550 /* if we haven't received a response for oldreq, 551 remove it from the list. */ 552 spin_lock(&c->lock); 553 if (oldreq->status == REQ_STATUS_FLSH) 554 list_del(&oldreq->req_list); 555 spin_unlock(&c->lock); 556 557 p9_free_req(c, req); 558 return 0; 559 } 560 561 /** 562 * p9_client_rpc - issue a request and wait for a response 563 * @c: client session 564 * @type: type of request 565 * @fmt: protocol format string (see protocol.c) 566 * 567 * Returns request structure (which client must free using p9_free_req) 568 */ 569 570 static struct p9_req_t * 571 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 572 { 573 va_list ap; 574 int tag, err; 575 struct p9_req_t *req; 576 unsigned long flags; 577 int sigpending; 578 579 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type); 580 581 /* we allow for any status other than disconnected */ 582 if (c->status == Disconnected) 583 return ERR_PTR(-EIO); 584 585 /* if status is begin_disconnected we allow only clunk request */ 586 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) 587 return ERR_PTR(-EIO); 588 589 if (signal_pending(current)) { 590 sigpending = 1; 591 clear_thread_flag(TIF_SIGPENDING); 592 } else 593 sigpending = 0; 594 595 tag = P9_NOTAG; 596 if (type != P9_TVERSION) { 597 tag = p9_idpool_get(c->tagpool); 598 if (tag < 0) 599 return ERR_PTR(-ENOMEM); 600 } 601 602 req = p9_tag_alloc(c, tag); 603 if (IS_ERR(req)) 604 return req; 605 606 /* marshall the data */ 607 p9pdu_prepare(req->tc, tag, type); 608 va_start(ap, fmt); 609 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap); 610 va_end(ap); 611 if (err) 612 goto reterr; 613 p9pdu_finalize(req->tc); 614 615 err = c->trans_mod->request(c, req); 616 if (err < 0) { 617 if (err != -ERESTARTSYS) 618 c->status = Disconnected; 619 goto reterr; 620 } 621 622 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag); 623 err = wait_event_interruptible(*req->wq, 624 req->status >= REQ_STATUS_RCVD); 625 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n", 626 req->wq, tag, err); 627 628 if (req->status == REQ_STATUS_ERROR) { 629 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 630 err = req->t_err; 631 } 632 633 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 634 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n"); 635 sigpending = 1; 636 clear_thread_flag(TIF_SIGPENDING); 637 638 if (c->trans_mod->cancel(c, req)) 639 p9_client_flush(c, req); 640 641 /* if we received the response anyway, don't signal error */ 642 if (req->status == REQ_STATUS_RCVD) 643 err = 0; 644 } 645 646 if (sigpending) { 647 spin_lock_irqsave(¤t->sighand->siglock, flags); 648 recalc_sigpending(); 649 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 650 } 651 652 if (err < 0) 653 goto reterr; 654 655 err = p9_check_errors(c, req); 656 if (!err) { 657 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type); 658 return req; 659 } 660 661 reterr: 662 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type, 663 err); 664 p9_free_req(c, req); 665 return ERR_PTR(err); 666 } 667 668 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 669 { 670 int ret; 671 struct p9_fid *fid; 672 unsigned long flags; 673 674 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt); 675 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 676 if (!fid) 677 return ERR_PTR(-ENOMEM); 678 679 ret = p9_idpool_get(clnt->fidpool); 680 if (ret < 0) { 681 ret = -ENOSPC; 682 goto error; 683 } 684 fid->fid = ret; 685 686 memset(&fid->qid, 0, sizeof(struct p9_qid)); 687 fid->mode = -1; 688 fid->uid = current_fsuid(); 689 fid->clnt = clnt; 690 fid->rdir = NULL; 691 spin_lock_irqsave(&clnt->lock, flags); 692 list_add(&fid->flist, &clnt->fidlist); 693 spin_unlock_irqrestore(&clnt->lock, flags); 694 695 return fid; 696 697 error: 698 kfree(fid); 699 return ERR_PTR(ret); 700 } 701 702 static void p9_fid_destroy(struct p9_fid *fid) 703 { 704 struct p9_client *clnt; 705 unsigned long flags; 706 707 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid); 708 clnt = fid->clnt; 709 p9_idpool_put(fid->fid, clnt->fidpool); 710 spin_lock_irqsave(&clnt->lock, flags); 711 list_del(&fid->flist); 712 spin_unlock_irqrestore(&clnt->lock, flags); 713 kfree(fid->rdir); 714 kfree(fid); 715 } 716 717 static int p9_client_version(struct p9_client *c) 718 { 719 int err = 0; 720 struct p9_req_t *req; 721 char *version; 722 int msize; 723 724 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 725 c->msize, c->proto_version); 726 727 switch (c->proto_version) { 728 case p9_proto_2000L: 729 req = p9_client_rpc(c, P9_TVERSION, "ds", 730 c->msize, "9P2000.L"); 731 break; 732 case p9_proto_2000u: 733 req = p9_client_rpc(c, P9_TVERSION, "ds", 734 c->msize, "9P2000.u"); 735 break; 736 case p9_proto_legacy: 737 req = p9_client_rpc(c, P9_TVERSION, "ds", 738 c->msize, "9P2000"); 739 break; 740 default: 741 return -EINVAL; 742 break; 743 } 744 745 if (IS_ERR(req)) 746 return PTR_ERR(req); 747 748 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version); 749 if (err) { 750 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err); 751 p9pdu_dump(1, req->rc); 752 goto error; 753 } 754 755 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 756 if (!strncmp(version, "9P2000.L", 8)) 757 c->proto_version = p9_proto_2000L; 758 else if (!strncmp(version, "9P2000.u", 8)) 759 c->proto_version = p9_proto_2000u; 760 else if (!strncmp(version, "9P2000", 6)) 761 c->proto_version = p9_proto_legacy; 762 else { 763 err = -EREMOTEIO; 764 goto error; 765 } 766 767 if (msize < c->msize) 768 c->msize = msize; 769 770 error: 771 kfree(version); 772 p9_free_req(c, req); 773 774 return err; 775 } 776 777 struct p9_client *p9_client_create(const char *dev_name, char *options) 778 { 779 int err; 780 struct p9_client *clnt; 781 782 err = 0; 783 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 784 if (!clnt) 785 return ERR_PTR(-ENOMEM); 786 787 clnt->trans_mod = NULL; 788 clnt->trans = NULL; 789 spin_lock_init(&clnt->lock); 790 INIT_LIST_HEAD(&clnt->fidlist); 791 792 p9_tag_init(clnt); 793 794 err = parse_opts(options, clnt); 795 if (err < 0) 796 goto free_client; 797 798 if (!clnt->trans_mod) 799 clnt->trans_mod = v9fs_get_default_trans(); 800 801 if (clnt->trans_mod == NULL) { 802 err = -EPROTONOSUPPORT; 803 P9_DPRINTK(P9_DEBUG_ERROR, 804 "No transport defined or default transport\n"); 805 goto free_client; 806 } 807 808 clnt->fidpool = p9_idpool_create(); 809 if (IS_ERR(clnt->fidpool)) { 810 err = PTR_ERR(clnt->fidpool); 811 clnt->fidpool = NULL; 812 goto put_trans; 813 } 814 815 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 816 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 817 818 err = clnt->trans_mod->create(clnt, dev_name, options); 819 if (err) 820 goto destroy_fidpool; 821 822 if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize) 823 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ; 824 825 err = p9_client_version(clnt); 826 if (err) 827 goto close_trans; 828 829 return clnt; 830 831 close_trans: 832 clnt->trans_mod->close(clnt); 833 destroy_fidpool: 834 p9_idpool_destroy(clnt->fidpool); 835 put_trans: 836 v9fs_put_trans(clnt->trans_mod); 837 free_client: 838 kfree(clnt); 839 return ERR_PTR(err); 840 } 841 EXPORT_SYMBOL(p9_client_create); 842 843 void p9_client_destroy(struct p9_client *clnt) 844 { 845 struct p9_fid *fid, *fidptr; 846 847 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt); 848 849 if (clnt->trans_mod) 850 clnt->trans_mod->close(clnt); 851 852 v9fs_put_trans(clnt->trans_mod); 853 854 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) { 855 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid); 856 p9_fid_destroy(fid); 857 } 858 859 if (clnt->fidpool) 860 p9_idpool_destroy(clnt->fidpool); 861 862 p9_tag_cleanup(clnt); 863 864 kfree(clnt); 865 } 866 EXPORT_SYMBOL(p9_client_destroy); 867 868 void p9_client_disconnect(struct p9_client *clnt) 869 { 870 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); 871 clnt->status = Disconnected; 872 } 873 EXPORT_SYMBOL(p9_client_disconnect); 874 875 void p9_client_begin_disconnect(struct p9_client *clnt) 876 { 877 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); 878 clnt->status = BeginDisconnect; 879 } 880 EXPORT_SYMBOL(p9_client_begin_disconnect); 881 882 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 883 char *uname, u32 n_uname, char *aname) 884 { 885 int err; 886 struct p9_req_t *req; 887 struct p9_fid *fid; 888 struct p9_qid qid; 889 890 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 891 afid ? afid->fid : -1, uname, aname); 892 err = 0; 893 894 fid = p9_fid_create(clnt); 895 if (IS_ERR(fid)) { 896 err = PTR_ERR(fid); 897 fid = NULL; 898 goto error; 899 } 900 901 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid, 902 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 903 if (IS_ERR(req)) { 904 err = PTR_ERR(req); 905 goto error; 906 } 907 908 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid); 909 if (err) { 910 p9pdu_dump(1, req->rc); 911 p9_free_req(clnt, req); 912 goto error; 913 } 914 915 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 916 qid.type, 917 (unsigned long long)qid.path, 918 qid.version); 919 920 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 921 922 p9_free_req(clnt, req); 923 return fid; 924 925 error: 926 if (fid) 927 p9_fid_destroy(fid); 928 return ERR_PTR(err); 929 } 930 EXPORT_SYMBOL(p9_client_attach); 931 932 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames, 933 int clone) 934 { 935 int err; 936 struct p9_client *clnt; 937 struct p9_fid *fid; 938 struct p9_qid *wqids; 939 struct p9_req_t *req; 940 int16_t nwqids, count; 941 942 err = 0; 943 wqids = NULL; 944 clnt = oldfid->clnt; 945 if (clone) { 946 fid = p9_fid_create(clnt); 947 if (IS_ERR(fid)) { 948 err = PTR_ERR(fid); 949 fid = NULL; 950 goto error; 951 } 952 953 fid->uid = oldfid->uid; 954 } else 955 fid = oldfid; 956 957 958 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n", 959 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 960 961 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 962 nwname, wnames); 963 if (IS_ERR(req)) { 964 err = PTR_ERR(req); 965 goto error; 966 } 967 968 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids); 969 if (err) { 970 p9pdu_dump(1, req->rc); 971 p9_free_req(clnt, req); 972 goto clunk_fid; 973 } 974 p9_free_req(clnt, req); 975 976 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 977 978 if (nwqids != nwname) { 979 err = -ENOENT; 980 goto clunk_fid; 981 } 982 983 for (count = 0; count < nwqids; count++) 984 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 985 count, wqids[count].type, 986 (unsigned long long)wqids[count].path, 987 wqids[count].version); 988 989 if (nwname) 990 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 991 else 992 fid->qid = oldfid->qid; 993 994 kfree(wqids); 995 return fid; 996 997 clunk_fid: 998 kfree(wqids); 999 p9_client_clunk(fid); 1000 fid = NULL; 1001 1002 error: 1003 if (fid && (fid != oldfid)) 1004 p9_fid_destroy(fid); 1005 1006 return ERR_PTR(err); 1007 } 1008 EXPORT_SYMBOL(p9_client_walk); 1009 1010 int p9_client_open(struct p9_fid *fid, int mode) 1011 { 1012 int err; 1013 struct p9_client *clnt; 1014 struct p9_req_t *req; 1015 struct p9_qid qid; 1016 int iounit; 1017 1018 clnt = fid->clnt; 1019 P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1020 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1021 err = 0; 1022 1023 if (fid->mode != -1) 1024 return -EINVAL; 1025 1026 if (p9_is_proto_dotl(clnt)) 1027 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1028 else 1029 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1030 if (IS_ERR(req)) { 1031 err = PTR_ERR(req); 1032 goto error; 1033 } 1034 1035 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1036 if (err) { 1037 p9pdu_dump(1, req->rc); 1038 goto free_and_error; 1039 } 1040 1041 P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1042 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1043 (unsigned long long)qid.path, qid.version, iounit); 1044 1045 fid->mode = mode; 1046 fid->iounit = iounit; 1047 1048 free_and_error: 1049 p9_free_req(clnt, req); 1050 error: 1051 return err; 1052 } 1053 EXPORT_SYMBOL(p9_client_open); 1054 1055 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode, 1056 gid_t gid, struct p9_qid *qid) 1057 { 1058 int err = 0; 1059 struct p9_client *clnt; 1060 struct p9_req_t *req; 1061 int iounit; 1062 1063 P9_DPRINTK(P9_DEBUG_9P, 1064 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1065 ofid->fid, name, flags, mode, gid); 1066 clnt = ofid->clnt; 1067 1068 if (ofid->mode != -1) 1069 return -EINVAL; 1070 1071 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags, 1072 mode, gid); 1073 if (IS_ERR(req)) { 1074 err = PTR_ERR(req); 1075 goto error; 1076 } 1077 1078 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit); 1079 if (err) { 1080 p9pdu_dump(1, req->rc); 1081 goto free_and_error; 1082 } 1083 1084 P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1085 qid->type, 1086 (unsigned long long)qid->path, 1087 qid->version, iounit); 1088 1089 ofid->mode = mode; 1090 ofid->iounit = iounit; 1091 1092 free_and_error: 1093 p9_free_req(clnt, req); 1094 error: 1095 return err; 1096 } 1097 EXPORT_SYMBOL(p9_client_create_dotl); 1098 1099 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, 1100 char *extension) 1101 { 1102 int err; 1103 struct p9_client *clnt; 1104 struct p9_req_t *req; 1105 struct p9_qid qid; 1106 int iounit; 1107 1108 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1109 fid->fid, name, perm, mode); 1110 err = 0; 1111 clnt = fid->clnt; 1112 1113 if (fid->mode != -1) 1114 return -EINVAL; 1115 1116 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1117 mode, extension); 1118 if (IS_ERR(req)) { 1119 err = PTR_ERR(req); 1120 goto error; 1121 } 1122 1123 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1124 if (err) { 1125 p9pdu_dump(1, req->rc); 1126 goto free_and_error; 1127 } 1128 1129 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1130 qid.type, 1131 (unsigned long long)qid.path, 1132 qid.version, iounit); 1133 1134 fid->mode = mode; 1135 fid->iounit = iounit; 1136 1137 free_and_error: 1138 p9_free_req(clnt, req); 1139 error: 1140 return err; 1141 } 1142 EXPORT_SYMBOL(p9_client_fcreate); 1143 1144 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid, 1145 struct p9_qid *qid) 1146 { 1147 int err = 0; 1148 struct p9_client *clnt; 1149 struct p9_req_t *req; 1150 1151 P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1152 dfid->fid, name, symtgt); 1153 clnt = dfid->clnt; 1154 1155 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt, 1156 gid); 1157 if (IS_ERR(req)) { 1158 err = PTR_ERR(req); 1159 goto error; 1160 } 1161 1162 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1163 if (err) { 1164 p9pdu_dump(1, req->rc); 1165 goto free_and_error; 1166 } 1167 1168 P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1169 qid->type, (unsigned long long)qid->path, qid->version); 1170 1171 free_and_error: 1172 p9_free_req(clnt, req); 1173 error: 1174 return err; 1175 } 1176 EXPORT_SYMBOL(p9_client_symlink); 1177 1178 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname) 1179 { 1180 struct p9_client *clnt; 1181 struct p9_req_t *req; 1182 1183 P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1184 dfid->fid, oldfid->fid, newname); 1185 clnt = dfid->clnt; 1186 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1187 newname); 1188 if (IS_ERR(req)) 1189 return PTR_ERR(req); 1190 1191 P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n"); 1192 p9_free_req(clnt, req); 1193 return 0; 1194 } 1195 EXPORT_SYMBOL(p9_client_link); 1196 1197 int p9_client_fsync(struct p9_fid *fid, int datasync) 1198 { 1199 int err; 1200 struct p9_client *clnt; 1201 struct p9_req_t *req; 1202 1203 P9_DPRINTK(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1204 fid->fid, datasync); 1205 err = 0; 1206 clnt = fid->clnt; 1207 1208 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1209 if (IS_ERR(req)) { 1210 err = PTR_ERR(req); 1211 goto error; 1212 } 1213 1214 P9_DPRINTK(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1215 1216 p9_free_req(clnt, req); 1217 1218 error: 1219 return err; 1220 } 1221 EXPORT_SYMBOL(p9_client_fsync); 1222 1223 int p9_client_sync_fs(struct p9_fid *fid) 1224 { 1225 int err = 0; 1226 struct p9_req_t *req; 1227 struct p9_client *clnt; 1228 1229 P9_DPRINTK(P9_DEBUG_9P, ">>> TSYNC_FS fid %d\n", fid->fid); 1230 1231 clnt = fid->clnt; 1232 req = p9_client_rpc(clnt, P9_TSYNCFS, "d", fid->fid); 1233 if (IS_ERR(req)) { 1234 err = PTR_ERR(req); 1235 goto error; 1236 } 1237 P9_DPRINTK(P9_DEBUG_9P, "<<< RSYNCFS fid %d\n", fid->fid); 1238 p9_free_req(clnt, req); 1239 error: 1240 return err; 1241 } 1242 EXPORT_SYMBOL(p9_client_sync_fs); 1243 1244 int p9_client_clunk(struct p9_fid *fid) 1245 { 1246 int err; 1247 struct p9_client *clnt; 1248 struct p9_req_t *req; 1249 1250 if (!fid) { 1251 P9_EPRINTK(KERN_WARNING, "Trying to clunk with NULL fid\n"); 1252 dump_stack(); 1253 return 0; 1254 } 1255 1256 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid); 1257 err = 0; 1258 clnt = fid->clnt; 1259 1260 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1261 if (IS_ERR(req)) { 1262 err = PTR_ERR(req); 1263 goto error; 1264 } 1265 1266 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1267 1268 p9_free_req(clnt, req); 1269 p9_fid_destroy(fid); 1270 1271 error: 1272 return err; 1273 } 1274 EXPORT_SYMBOL(p9_client_clunk); 1275 1276 int p9_client_remove(struct p9_fid *fid) 1277 { 1278 int err; 1279 struct p9_client *clnt; 1280 struct p9_req_t *req; 1281 1282 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1283 err = 0; 1284 clnt = fid->clnt; 1285 1286 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1287 if (IS_ERR(req)) { 1288 err = PTR_ERR(req); 1289 goto error; 1290 } 1291 1292 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1293 1294 p9_free_req(clnt, req); 1295 error: 1296 p9_fid_destroy(fid); 1297 return err; 1298 } 1299 EXPORT_SYMBOL(p9_client_remove); 1300 1301 int 1302 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, 1303 u32 count) 1304 { 1305 int err, rsize, total; 1306 struct p9_client *clnt; 1307 struct p9_req_t *req; 1308 char *dataptr; 1309 1310 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid, 1311 (long long unsigned) offset, count); 1312 err = 0; 1313 clnt = fid->clnt; 1314 total = 0; 1315 1316 rsize = fid->iounit; 1317 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1318 rsize = clnt->msize - P9_IOHDRSZ; 1319 1320 if (count < rsize) 1321 rsize = count; 1322 1323 /* Don't bother zerocopy form small IO (< 1024) */ 1324 if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) == 1325 P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) { 1326 req = p9_client_rpc(clnt, P9_TREAD, "dqE", fid->fid, offset, 1327 rsize, data, udata); 1328 } else { 1329 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1330 rsize); 1331 } 1332 if (IS_ERR(req)) { 1333 err = PTR_ERR(req); 1334 goto error; 1335 } 1336 1337 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 1338 if (err) { 1339 p9pdu_dump(1, req->rc); 1340 goto free_and_error; 1341 } 1342 1343 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1344 1345 if (!req->tc->pbuf_size) { 1346 if (data) { 1347 memmove(data, dataptr, count); 1348 } else { 1349 err = copy_to_user(udata, dataptr, count); 1350 if (err) { 1351 err = -EFAULT; 1352 goto free_and_error; 1353 } 1354 } 1355 } 1356 p9_free_req(clnt, req); 1357 return count; 1358 1359 free_and_error: 1360 p9_free_req(clnt, req); 1361 error: 1362 return err; 1363 } 1364 EXPORT_SYMBOL(p9_client_read); 1365 1366 int 1367 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata, 1368 u64 offset, u32 count) 1369 { 1370 int err, rsize, total; 1371 struct p9_client *clnt; 1372 struct p9_req_t *req; 1373 1374 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n", 1375 fid->fid, (long long unsigned) offset, count); 1376 err = 0; 1377 clnt = fid->clnt; 1378 total = 0; 1379 1380 rsize = fid->iounit; 1381 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1382 rsize = clnt->msize - P9_IOHDRSZ; 1383 1384 if (count < rsize) 1385 rsize = count; 1386 1387 /* Don't bother zerocopy form small IO (< 1024) */ 1388 if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) == 1389 P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) { 1390 req = p9_client_rpc(clnt, P9_TWRITE, "dqE", fid->fid, offset, 1391 rsize, data, udata); 1392 } else { 1393 1394 if (data) 1395 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, 1396 offset, rsize, data); 1397 else 1398 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, 1399 offset, rsize, udata); 1400 } 1401 if (IS_ERR(req)) { 1402 err = PTR_ERR(req); 1403 goto error; 1404 } 1405 1406 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count); 1407 if (err) { 1408 p9pdu_dump(1, req->rc); 1409 goto free_and_error; 1410 } 1411 1412 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1413 1414 p9_free_req(clnt, req); 1415 return count; 1416 1417 free_and_error: 1418 p9_free_req(clnt, req); 1419 error: 1420 return err; 1421 } 1422 EXPORT_SYMBOL(p9_client_write); 1423 1424 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1425 { 1426 int err; 1427 struct p9_client *clnt; 1428 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1429 struct p9_req_t *req; 1430 u16 ignored; 1431 1432 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1433 1434 if (!ret) 1435 return ERR_PTR(-ENOMEM); 1436 1437 err = 0; 1438 clnt = fid->clnt; 1439 1440 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1441 if (IS_ERR(req)) { 1442 err = PTR_ERR(req); 1443 goto error; 1444 } 1445 1446 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret); 1447 if (err) { 1448 p9pdu_dump(1, req->rc); 1449 p9_free_req(clnt, req); 1450 goto error; 1451 } 1452 1453 P9_DPRINTK(P9_DEBUG_9P, 1454 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1455 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1456 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1457 "<<< uid=%d gid=%d n_muid=%d\n", 1458 ret->size, ret->type, ret->dev, ret->qid.type, 1459 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1460 ret->atime, ret->mtime, (unsigned long long)ret->length, 1461 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1462 ret->n_uid, ret->n_gid, ret->n_muid); 1463 1464 p9_free_req(clnt, req); 1465 return ret; 1466 1467 error: 1468 kfree(ret); 1469 return ERR_PTR(err); 1470 } 1471 EXPORT_SYMBOL(p9_client_stat); 1472 1473 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1474 u64 request_mask) 1475 { 1476 int err; 1477 struct p9_client *clnt; 1478 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1479 GFP_KERNEL); 1480 struct p9_req_t *req; 1481 1482 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1483 fid->fid, request_mask); 1484 1485 if (!ret) 1486 return ERR_PTR(-ENOMEM); 1487 1488 err = 0; 1489 clnt = fid->clnt; 1490 1491 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1492 if (IS_ERR(req)) { 1493 err = PTR_ERR(req); 1494 goto error; 1495 } 1496 1497 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret); 1498 if (err) { 1499 p9pdu_dump(1, req->rc); 1500 p9_free_req(clnt, req); 1501 goto error; 1502 } 1503 1504 P9_DPRINTK(P9_DEBUG_9P, 1505 "<<< RGETATTR st_result_mask=%lld\n" 1506 "<<< qid=%x.%llx.%x\n" 1507 "<<< st_mode=%8.8x st_nlink=%llu\n" 1508 "<<< st_uid=%d st_gid=%d\n" 1509 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1510 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1511 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1512 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1513 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1514 "<<< st_gen=%lld st_data_version=%lld", 1515 ret->st_result_mask, ret->qid.type, ret->qid.path, 1516 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid, 1517 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize, 1518 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1519 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1520 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1521 ret->st_gen, ret->st_data_version); 1522 1523 p9_free_req(clnt, req); 1524 return ret; 1525 1526 error: 1527 kfree(ret); 1528 return ERR_PTR(err); 1529 } 1530 EXPORT_SYMBOL(p9_client_getattr_dotl); 1531 1532 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1533 { 1534 int ret; 1535 1536 /* NOTE: size shouldn't include its own length */ 1537 /* size[2] type[2] dev[4] qid[13] */ 1538 /* mode[4] atime[4] mtime[4] length[8]*/ 1539 /* name[s] uid[s] gid[s] muid[s] */ 1540 ret = 2+4+13+4+4+4+8+2+2+2+2; 1541 1542 if (wst->name) 1543 ret += strlen(wst->name); 1544 if (wst->uid) 1545 ret += strlen(wst->uid); 1546 if (wst->gid) 1547 ret += strlen(wst->gid); 1548 if (wst->muid) 1549 ret += strlen(wst->muid); 1550 1551 if ((proto_version == p9_proto_2000u) || 1552 (proto_version == p9_proto_2000L)) { 1553 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1554 if (wst->extension) 1555 ret += strlen(wst->extension); 1556 } 1557 1558 return ret; 1559 } 1560 1561 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1562 { 1563 int err; 1564 struct p9_req_t *req; 1565 struct p9_client *clnt; 1566 1567 err = 0; 1568 clnt = fid->clnt; 1569 wst->size = p9_client_statsize(wst, clnt->proto_version); 1570 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1571 P9_DPRINTK(P9_DEBUG_9P, 1572 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1573 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1574 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1575 " uid=%d gid=%d n_muid=%d\n", 1576 wst->size, wst->type, wst->dev, wst->qid.type, 1577 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1578 wst->atime, wst->mtime, (unsigned long long)wst->length, 1579 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1580 wst->n_uid, wst->n_gid, wst->n_muid); 1581 1582 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1583 if (IS_ERR(req)) { 1584 err = PTR_ERR(req); 1585 goto error; 1586 } 1587 1588 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1589 1590 p9_free_req(clnt, req); 1591 error: 1592 return err; 1593 } 1594 EXPORT_SYMBOL(p9_client_wstat); 1595 1596 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1597 { 1598 int err; 1599 struct p9_req_t *req; 1600 struct p9_client *clnt; 1601 1602 err = 0; 1603 clnt = fid->clnt; 1604 P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1605 P9_DPRINTK(P9_DEBUG_9P, 1606 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1607 " atime_sec=%lld atime_nsec=%lld\n" 1608 " mtime_sec=%lld mtime_nsec=%lld\n", 1609 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid, 1610 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1611 p9attr->mtime_sec, p9attr->mtime_nsec); 1612 1613 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1614 1615 if (IS_ERR(req)) { 1616 err = PTR_ERR(req); 1617 goto error; 1618 } 1619 P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1620 p9_free_req(clnt, req); 1621 error: 1622 return err; 1623 } 1624 EXPORT_SYMBOL(p9_client_setattr); 1625 1626 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1627 { 1628 int err; 1629 struct p9_req_t *req; 1630 struct p9_client *clnt; 1631 1632 err = 0; 1633 clnt = fid->clnt; 1634 1635 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1636 1637 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1638 if (IS_ERR(req)) { 1639 err = PTR_ERR(req); 1640 goto error; 1641 } 1642 1643 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1644 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1645 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1646 if (err) { 1647 p9pdu_dump(1, req->rc); 1648 p9_free_req(clnt, req); 1649 goto error; 1650 } 1651 1652 P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1653 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1654 "fsid %llu namelen %ld\n", 1655 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1656 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1657 sb->fsid, (long int)sb->namelen); 1658 1659 p9_free_req(clnt, req); 1660 error: 1661 return err; 1662 } 1663 EXPORT_SYMBOL(p9_client_statfs); 1664 1665 int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, char *name) 1666 { 1667 int err; 1668 struct p9_req_t *req; 1669 struct p9_client *clnt; 1670 1671 err = 0; 1672 clnt = fid->clnt; 1673 1674 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1675 fid->fid, newdirfid->fid, name); 1676 1677 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1678 newdirfid->fid, name); 1679 if (IS_ERR(req)) { 1680 err = PTR_ERR(req); 1681 goto error; 1682 } 1683 1684 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1685 1686 p9_free_req(clnt, req); 1687 error: 1688 return err; 1689 } 1690 EXPORT_SYMBOL(p9_client_rename); 1691 1692 /* 1693 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1694 */ 1695 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1696 const char *attr_name, u64 *attr_size) 1697 { 1698 int err; 1699 struct p9_req_t *req; 1700 struct p9_client *clnt; 1701 struct p9_fid *attr_fid; 1702 1703 err = 0; 1704 clnt = file_fid->clnt; 1705 attr_fid = p9_fid_create(clnt); 1706 if (IS_ERR(attr_fid)) { 1707 err = PTR_ERR(attr_fid); 1708 attr_fid = NULL; 1709 goto error; 1710 } 1711 P9_DPRINTK(P9_DEBUG_9P, 1712 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 1713 file_fid->fid, attr_fid->fid, attr_name); 1714 1715 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 1716 file_fid->fid, attr_fid->fid, attr_name); 1717 if (IS_ERR(req)) { 1718 err = PTR_ERR(req); 1719 goto error; 1720 } 1721 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size); 1722 if (err) { 1723 p9pdu_dump(1, req->rc); 1724 p9_free_req(clnt, req); 1725 goto clunk_fid; 1726 } 1727 p9_free_req(clnt, req); 1728 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 1729 attr_fid->fid, *attr_size); 1730 return attr_fid; 1731 clunk_fid: 1732 p9_client_clunk(attr_fid); 1733 attr_fid = NULL; 1734 error: 1735 if (attr_fid && (attr_fid != file_fid)) 1736 p9_fid_destroy(attr_fid); 1737 1738 return ERR_PTR(err); 1739 } 1740 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 1741 1742 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 1743 u64 attr_size, int flags) 1744 { 1745 int err; 1746 struct p9_req_t *req; 1747 struct p9_client *clnt; 1748 1749 P9_DPRINTK(P9_DEBUG_9P, 1750 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 1751 fid->fid, name, (long long)attr_size, flags); 1752 err = 0; 1753 clnt = fid->clnt; 1754 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 1755 fid->fid, name, attr_size, flags); 1756 if (IS_ERR(req)) { 1757 err = PTR_ERR(req); 1758 goto error; 1759 } 1760 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 1761 p9_free_req(clnt, req); 1762 error: 1763 return err; 1764 } 1765 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 1766 1767 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 1768 { 1769 int err, rsize, total; 1770 struct p9_client *clnt; 1771 struct p9_req_t *req; 1772 char *dataptr; 1773 1774 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 1775 fid->fid, (long long unsigned) offset, count); 1776 1777 err = 0; 1778 clnt = fid->clnt; 1779 total = 0; 1780 1781 rsize = fid->iounit; 1782 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 1783 rsize = clnt->msize - P9_READDIRHDRSZ; 1784 1785 if (count < rsize) 1786 rsize = count; 1787 1788 if ((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) == 1789 P9_TRANS_PREF_PAYLOAD_SEP) { 1790 req = p9_client_rpc(clnt, P9_TREADDIR, "dqF", fid->fid, 1791 offset, rsize, data); 1792 } else { 1793 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 1794 offset, rsize); 1795 } 1796 if (IS_ERR(req)) { 1797 err = PTR_ERR(req); 1798 goto error; 1799 } 1800 1801 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 1802 if (err) { 1803 p9pdu_dump(1, req->rc); 1804 goto free_and_error; 1805 } 1806 1807 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 1808 1809 if (!req->tc->pbuf_size && data) 1810 memmove(data, dataptr, count); 1811 1812 p9_free_req(clnt, req); 1813 return count; 1814 1815 free_and_error: 1816 p9_free_req(clnt, req); 1817 error: 1818 return err; 1819 } 1820 EXPORT_SYMBOL(p9_client_readdir); 1821 1822 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode, 1823 dev_t rdev, gid_t gid, struct p9_qid *qid) 1824 { 1825 int err; 1826 struct p9_client *clnt; 1827 struct p9_req_t *req; 1828 1829 err = 0; 1830 clnt = fid->clnt; 1831 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 1832 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 1833 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode, 1834 MAJOR(rdev), MINOR(rdev), gid); 1835 if (IS_ERR(req)) 1836 return PTR_ERR(req); 1837 1838 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1839 if (err) { 1840 p9pdu_dump(1, req->rc); 1841 goto error; 1842 } 1843 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 1844 (unsigned long long)qid->path, qid->version); 1845 1846 error: 1847 p9_free_req(clnt, req); 1848 return err; 1849 1850 } 1851 EXPORT_SYMBOL(p9_client_mknod_dotl); 1852 1853 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode, 1854 gid_t gid, struct p9_qid *qid) 1855 { 1856 int err; 1857 struct p9_client *clnt; 1858 struct p9_req_t *req; 1859 1860 err = 0; 1861 clnt = fid->clnt; 1862 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 1863 fid->fid, name, mode, gid); 1864 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode, 1865 gid); 1866 if (IS_ERR(req)) 1867 return PTR_ERR(req); 1868 1869 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1870 if (err) { 1871 p9pdu_dump(1, req->rc); 1872 goto error; 1873 } 1874 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 1875 (unsigned long long)qid->path, qid->version); 1876 1877 error: 1878 p9_free_req(clnt, req); 1879 return err; 1880 1881 } 1882 EXPORT_SYMBOL(p9_client_mkdir_dotl); 1883 1884 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 1885 { 1886 int err; 1887 struct p9_client *clnt; 1888 struct p9_req_t *req; 1889 1890 err = 0; 1891 clnt = fid->clnt; 1892 P9_DPRINTK(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " 1893 "start %lld length %lld proc_id %d client_id %s\n", 1894 fid->fid, flock->type, flock->flags, flock->start, 1895 flock->length, flock->proc_id, flock->client_id); 1896 1897 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 1898 flock->flags, flock->start, flock->length, 1899 flock->proc_id, flock->client_id); 1900 1901 if (IS_ERR(req)) 1902 return PTR_ERR(req); 1903 1904 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status); 1905 if (err) { 1906 p9pdu_dump(1, req->rc); 1907 goto error; 1908 } 1909 P9_DPRINTK(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 1910 error: 1911 p9_free_req(clnt, req); 1912 return err; 1913 1914 } 1915 EXPORT_SYMBOL(p9_client_lock_dotl); 1916 1917 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 1918 { 1919 int err; 1920 struct p9_client *clnt; 1921 struct p9_req_t *req; 1922 1923 err = 0; 1924 clnt = fid->clnt; 1925 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " 1926 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, 1927 glock->start, glock->length, glock->proc_id, glock->client_id); 1928 1929 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, 1930 glock->start, glock->length, glock->proc_id, glock->client_id); 1931 1932 if (IS_ERR(req)) 1933 return PTR_ERR(req); 1934 1935 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type, 1936 &glock->start, &glock->length, &glock->proc_id, 1937 &glock->client_id); 1938 if (err) { 1939 p9pdu_dump(1, req->rc); 1940 goto error; 1941 } 1942 P9_DPRINTK(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " 1943 "proc_id %d client_id %s\n", glock->type, glock->start, 1944 glock->length, glock->proc_id, glock->client_id); 1945 error: 1946 p9_free_req(clnt, req); 1947 return err; 1948 } 1949 EXPORT_SYMBOL(p9_client_getlock_dotl); 1950 1951 int p9_client_readlink(struct p9_fid *fid, char **target) 1952 { 1953 int err; 1954 struct p9_client *clnt; 1955 struct p9_req_t *req; 1956 1957 err = 0; 1958 clnt = fid->clnt; 1959 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 1960 1961 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 1962 if (IS_ERR(req)) 1963 return PTR_ERR(req); 1964 1965 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target); 1966 if (err) { 1967 p9pdu_dump(1, req->rc); 1968 goto error; 1969 } 1970 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 1971 error: 1972 p9_free_req(clnt, req); 1973 return err; 1974 } 1975 EXPORT_SYMBOL(p9_client_readlink); 1976