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 /** 96 * parse_options - parse mount options into client structure 97 * @opts: options string passed from mount 98 * @clnt: existing v9fs client information 99 * 100 * Return 0 upon success, -ERRNO upon failure 101 */ 102 103 static int parse_opts(char *opts, struct p9_client *clnt) 104 { 105 char *options, *tmp_options; 106 char *p; 107 substring_t args[MAX_OPT_ARGS]; 108 int option; 109 int ret = 0; 110 111 clnt->proto_version = p9_proto_2000u; 112 clnt->msize = 8192; 113 114 if (!opts) 115 return 0; 116 117 tmp_options = kstrdup(opts, GFP_KERNEL); 118 if (!tmp_options) { 119 P9_DPRINTK(P9_DEBUG_ERROR, 120 "failed to allocate copy of option string\n"); 121 return -ENOMEM; 122 } 123 options = tmp_options; 124 125 while ((p = strsep(&options, ",")) != NULL) { 126 int token; 127 if (!*p) 128 continue; 129 token = match_token(p, tokens, args); 130 if (token < Opt_trans) { 131 int r = match_int(&args[0], &option); 132 if (r < 0) { 133 P9_DPRINTK(P9_DEBUG_ERROR, 134 "integer field, but no integer?\n"); 135 ret = r; 136 continue; 137 } 138 } 139 switch (token) { 140 case Opt_msize: 141 clnt->msize = option; 142 break; 143 case Opt_trans: 144 clnt->trans_mod = v9fs_get_trans_by_name(&args[0]); 145 if(clnt->trans_mod == NULL) { 146 P9_DPRINTK(P9_DEBUG_ERROR, 147 "Could not find request transport: %s\n", 148 (char *) &args[0]); 149 ret = -EINVAL; 150 goto free_and_return; 151 } 152 break; 153 case Opt_legacy: 154 clnt->proto_version = p9_proto_legacy; 155 break; 156 case Opt_version: 157 ret = get_protocol_version(&args[0]); 158 if (ret == -EINVAL) 159 goto free_and_return; 160 clnt->proto_version = ret; 161 break; 162 default: 163 continue; 164 } 165 } 166 167 free_and_return: 168 kfree(tmp_options); 169 return ret; 170 } 171 172 /** 173 * p9_tag_alloc - lookup/allocate a request by tag 174 * @c: client session to lookup tag within 175 * @tag: numeric id for transaction 176 * 177 * this is a simple array lookup, but will grow the 178 * request_slots as necessary to accommodate transaction 179 * ids which did not previously have a slot. 180 * 181 * this code relies on the client spinlock to manage locks, its 182 * possible we should switch to something else, but I'd rather 183 * stick with something low-overhead for the common case. 184 * 185 */ 186 187 static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag) 188 { 189 unsigned long flags; 190 int row, col; 191 struct p9_req_t *req; 192 193 /* This looks up the original request by tag so we know which 194 * buffer to read the data into */ 195 tag++; 196 197 if (tag >= c->max_tag) { 198 spin_lock_irqsave(&c->lock, flags); 199 /* check again since original check was outside of lock */ 200 while (tag >= c->max_tag) { 201 row = (tag / P9_ROW_MAXTAG); 202 c->reqs[row] = kcalloc(P9_ROW_MAXTAG, 203 sizeof(struct p9_req_t), GFP_ATOMIC); 204 205 if (!c->reqs[row]) { 206 printk(KERN_ERR "Couldn't grow tag array\n"); 207 spin_unlock_irqrestore(&c->lock, flags); 208 return ERR_PTR(-ENOMEM); 209 } 210 for (col = 0; col < P9_ROW_MAXTAG; col++) { 211 c->reqs[row][col].status = REQ_STATUS_IDLE; 212 c->reqs[row][col].tc = NULL; 213 } 214 c->max_tag += P9_ROW_MAXTAG; 215 } 216 spin_unlock_irqrestore(&c->lock, flags); 217 } 218 row = tag / P9_ROW_MAXTAG; 219 col = tag % P9_ROW_MAXTAG; 220 221 req = &c->reqs[row][col]; 222 if (!req->tc) { 223 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS); 224 if (!req->wq) { 225 printk(KERN_ERR "Couldn't grow tag array\n"); 226 return ERR_PTR(-ENOMEM); 227 } 228 init_waitqueue_head(req->wq); 229 if ((c->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) == 230 P9_TRANS_PREF_PAYLOAD_SEP) { 231 int alloc_msize = min(c->msize, 4096); 232 req->tc = kmalloc(sizeof(struct p9_fcall)+alloc_msize, 233 GFP_NOFS); 234 req->tc->capacity = alloc_msize; 235 req->rc = kmalloc(sizeof(struct p9_fcall)+alloc_msize, 236 GFP_NOFS); 237 req->rc->capacity = alloc_msize; 238 } else { 239 req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize, 240 GFP_NOFS); 241 req->tc->capacity = c->msize; 242 req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize, 243 GFP_NOFS); 244 req->rc->capacity = c->msize; 245 } 246 if ((!req->tc) || (!req->rc)) { 247 printk(KERN_ERR "Couldn't grow tag array\n"); 248 kfree(req->tc); 249 kfree(req->rc); 250 kfree(req->wq); 251 req->tc = req->rc = NULL; 252 req->wq = NULL; 253 return ERR_PTR(-ENOMEM); 254 } 255 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall); 256 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall); 257 } 258 259 p9pdu_reset(req->tc); 260 p9pdu_reset(req->rc); 261 262 req->tc->tag = tag-1; 263 req->status = REQ_STATUS_ALLOC; 264 265 return &c->reqs[row][col]; 266 } 267 268 /** 269 * p9_tag_lookup - lookup a request by tag 270 * @c: client session to lookup tag within 271 * @tag: numeric id for transaction 272 * 273 */ 274 275 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 276 { 277 int row, col; 278 279 /* This looks up the original request by tag so we know which 280 * buffer to read the data into */ 281 tag++; 282 283 BUG_ON(tag >= c->max_tag); 284 285 row = tag / P9_ROW_MAXTAG; 286 col = tag % P9_ROW_MAXTAG; 287 288 return &c->reqs[row][col]; 289 } 290 EXPORT_SYMBOL(p9_tag_lookup); 291 292 /** 293 * p9_tag_init - setup tags structure and contents 294 * @c: v9fs client struct 295 * 296 * This initializes the tags structure for each client instance. 297 * 298 */ 299 300 static int p9_tag_init(struct p9_client *c) 301 { 302 int err = 0; 303 304 c->tagpool = p9_idpool_create(); 305 if (IS_ERR(c->tagpool)) { 306 err = PTR_ERR(c->tagpool); 307 goto error; 308 } 309 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */ 310 if (err < 0) { 311 p9_idpool_destroy(c->tagpool); 312 goto error; 313 } 314 c->max_tag = 0; 315 error: 316 return err; 317 } 318 319 /** 320 * p9_tag_cleanup - cleans up tags structure and reclaims resources 321 * @c: v9fs client struct 322 * 323 * This frees resources associated with the tags structure 324 * 325 */ 326 static void p9_tag_cleanup(struct p9_client *c) 327 { 328 int row, col; 329 330 /* check to insure all requests are idle */ 331 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 332 for (col = 0; col < P9_ROW_MAXTAG; col++) { 333 if (c->reqs[row][col].status != REQ_STATUS_IDLE) { 334 P9_DPRINTK(P9_DEBUG_MUX, 335 "Attempting to cleanup non-free tag %d,%d\n", 336 row, col); 337 /* TODO: delay execution of cleanup */ 338 return; 339 } 340 } 341 } 342 343 if (c->tagpool) { 344 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */ 345 p9_idpool_destroy(c->tagpool); 346 } 347 348 /* free requests associated with tags */ 349 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 350 for (col = 0; col < P9_ROW_MAXTAG; col++) { 351 kfree(c->reqs[row][col].wq); 352 kfree(c->reqs[row][col].tc); 353 kfree(c->reqs[row][col].rc); 354 } 355 kfree(c->reqs[row]); 356 } 357 c->max_tag = 0; 358 } 359 360 /** 361 * p9_free_req - free a request and clean-up as necessary 362 * c: client state 363 * r: request to release 364 * 365 */ 366 367 static void p9_free_req(struct p9_client *c, struct p9_req_t *r) 368 { 369 int tag = r->tc->tag; 370 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); 371 372 r->status = REQ_STATUS_IDLE; 373 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool)) 374 p9_idpool_put(tag, c->tagpool); 375 } 376 377 /** 378 * p9_client_cb - call back from transport to client 379 * c: client state 380 * req: request received 381 * 382 */ 383 void p9_client_cb(struct p9_client *c, struct p9_req_t *req) 384 { 385 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag); 386 wake_up(req->wq); 387 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag); 388 } 389 EXPORT_SYMBOL(p9_client_cb); 390 391 /** 392 * p9_parse_header - parse header arguments out of a packet 393 * @pdu: packet to parse 394 * @size: size of packet 395 * @type: type of request 396 * @tag: tag of packet 397 * @rewind: set if we need to rewind offset afterwards 398 */ 399 400 int 401 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, 402 int rewind) 403 { 404 int8_t r_type; 405 int16_t r_tag; 406 int32_t r_size; 407 int offset = pdu->offset; 408 int err; 409 410 pdu->offset = 0; 411 if (pdu->size == 0) 412 pdu->size = 7; 413 414 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 415 if (err) 416 goto rewind_and_exit; 417 418 pdu->size = r_size; 419 pdu->id = r_type; 420 pdu->tag = r_tag; 421 422 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size, 423 pdu->id, pdu->tag); 424 425 if (type) 426 *type = r_type; 427 if (tag) 428 *tag = r_tag; 429 if (size) 430 *size = r_size; 431 432 433 rewind_and_exit: 434 if (rewind) 435 pdu->offset = offset; 436 return err; 437 } 438 EXPORT_SYMBOL(p9_parse_header); 439 440 /** 441 * p9_check_errors - check 9p packet for error return and process it 442 * @c: current client instance 443 * @req: request to parse and check for error conditions 444 * 445 * returns error code if one is discovered, otherwise returns 0 446 * 447 * this will have to be more complicated if we have multiple 448 * error packet types 449 */ 450 451 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 452 { 453 int8_t type; 454 int err; 455 int ecode; 456 457 err = p9_parse_header(req->rc, NULL, &type, NULL, 0); 458 if (err) { 459 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 460 return err; 461 } 462 463 if (type != P9_RERROR && type != P9_RLERROR) 464 return 0; 465 466 if (!p9_is_proto_dotl(c)) { 467 char *ename; 468 469 if (req->tc->pbuf_size) { 470 /* Handle user buffers */ 471 size_t len = req->rc->size - req->rc->offset; 472 if (req->tc->pubuf) { 473 /* User Buffer */ 474 err = copy_from_user( 475 &req->rc->sdata[req->rc->offset], 476 req->tc->pubuf, len); 477 if (err) { 478 err = -EFAULT; 479 goto out_err; 480 } 481 } else { 482 /* Kernel Buffer */ 483 memmove(&req->rc->sdata[req->rc->offset], 484 req->tc->pkbuf, len); 485 } 486 } 487 err = p9pdu_readf(req->rc, c->proto_version, "s?d", 488 &ename, &ecode); 489 if (err) 490 goto out_err; 491 492 if (p9_is_proto_dotu(c)) 493 err = -ecode; 494 495 if (!err || !IS_ERR_VALUE(err)) { 496 err = p9_errstr2errno(ename, strlen(ename)); 497 498 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, 499 ename); 500 501 kfree(ename); 502 } 503 } else { 504 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); 505 err = -ecode; 506 507 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 508 } 509 510 511 return err; 512 513 out_err: 514 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 515 516 return err; 517 } 518 519 static struct p9_req_t * 520 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 521 522 /** 523 * p9_client_flush - flush (cancel) a request 524 * @c: client state 525 * @oldreq: request to cancel 526 * 527 * This sents a flush for a particular request and links 528 * the flush request to the original request. The current 529 * code only supports a single flush request although the protocol 530 * allows for multiple flush requests to be sent for a single request. 531 * 532 */ 533 534 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 535 { 536 struct p9_req_t *req; 537 int16_t oldtag; 538 int err; 539 540 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); 541 if (err) 542 return err; 543 544 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 545 546 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 547 if (IS_ERR(req)) 548 return PTR_ERR(req); 549 550 551 /* if we haven't received a response for oldreq, 552 remove it from the list. */ 553 spin_lock(&c->lock); 554 if (oldreq->status == REQ_STATUS_FLSH) 555 list_del(&oldreq->req_list); 556 spin_unlock(&c->lock); 557 558 p9_free_req(c, req); 559 return 0; 560 } 561 562 /** 563 * p9_client_rpc - issue a request and wait for a response 564 * @c: client session 565 * @type: type of request 566 * @fmt: protocol format string (see protocol.c) 567 * 568 * Returns request structure (which client must free using p9_free_req) 569 */ 570 571 static struct p9_req_t * 572 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 573 { 574 va_list ap; 575 int tag, err; 576 struct p9_req_t *req; 577 unsigned long flags; 578 int sigpending; 579 580 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type); 581 582 /* we allow for any status other than disconnected */ 583 if (c->status == Disconnected) 584 return ERR_PTR(-EIO); 585 586 /* if status is begin_disconnected we allow only clunk request */ 587 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) 588 return ERR_PTR(-EIO); 589 590 if (signal_pending(current)) { 591 sigpending = 1; 592 clear_thread_flag(TIF_SIGPENDING); 593 } else 594 sigpending = 0; 595 596 tag = P9_NOTAG; 597 if (type != P9_TVERSION) { 598 tag = p9_idpool_get(c->tagpool); 599 if (tag < 0) 600 return ERR_PTR(-ENOMEM); 601 } 602 603 req = p9_tag_alloc(c, tag); 604 if (IS_ERR(req)) 605 return req; 606 607 /* marshall the data */ 608 p9pdu_prepare(req->tc, tag, type); 609 va_start(ap, fmt); 610 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap); 611 va_end(ap); 612 if (err) 613 goto reterr; 614 p9pdu_finalize(req->tc); 615 616 err = c->trans_mod->request(c, req); 617 if (err < 0) { 618 if (err != -ERESTARTSYS && err != -EFAULT) 619 c->status = Disconnected; 620 goto reterr; 621 } 622 623 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag); 624 err = wait_event_interruptible(*req->wq, 625 req->status >= REQ_STATUS_RCVD); 626 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n", 627 req->wq, tag, err); 628 629 if (req->status == REQ_STATUS_ERROR) { 630 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 631 err = req->t_err; 632 } 633 634 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 635 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n"); 636 sigpending = 1; 637 clear_thread_flag(TIF_SIGPENDING); 638 639 if (c->trans_mod->cancel(c, req)) 640 p9_client_flush(c, req); 641 642 /* if we received the response anyway, don't signal error */ 643 if (req->status == REQ_STATUS_RCVD) 644 err = 0; 645 } 646 647 if (sigpending) { 648 spin_lock_irqsave(¤t->sighand->siglock, flags); 649 recalc_sigpending(); 650 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 651 } 652 653 if (err < 0) 654 goto reterr; 655 656 err = p9_check_errors(c, req); 657 if (!err) { 658 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type); 659 return req; 660 } 661 662 reterr: 663 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type, 664 err); 665 p9_free_req(c, req); 666 return ERR_PTR(err); 667 } 668 669 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 670 { 671 int ret; 672 struct p9_fid *fid; 673 unsigned long flags; 674 675 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt); 676 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 677 if (!fid) 678 return ERR_PTR(-ENOMEM); 679 680 ret = p9_idpool_get(clnt->fidpool); 681 if (ret < 0) { 682 ret = -ENOSPC; 683 goto error; 684 } 685 fid->fid = ret; 686 687 memset(&fid->qid, 0, sizeof(struct p9_qid)); 688 fid->mode = -1; 689 fid->uid = current_fsuid(); 690 fid->clnt = clnt; 691 fid->rdir = NULL; 692 spin_lock_irqsave(&clnt->lock, flags); 693 list_add(&fid->flist, &clnt->fidlist); 694 spin_unlock_irqrestore(&clnt->lock, flags); 695 696 return fid; 697 698 error: 699 kfree(fid); 700 return ERR_PTR(ret); 701 } 702 703 static void p9_fid_destroy(struct p9_fid *fid) 704 { 705 struct p9_client *clnt; 706 unsigned long flags; 707 708 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid); 709 clnt = fid->clnt; 710 p9_idpool_put(fid->fid, clnt->fidpool); 711 spin_lock_irqsave(&clnt->lock, flags); 712 list_del(&fid->flist); 713 spin_unlock_irqrestore(&clnt->lock, flags); 714 kfree(fid->rdir); 715 kfree(fid); 716 } 717 718 static int p9_client_version(struct p9_client *c) 719 { 720 int err = 0; 721 struct p9_req_t *req; 722 char *version; 723 int msize; 724 725 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 726 c->msize, c->proto_version); 727 728 switch (c->proto_version) { 729 case p9_proto_2000L: 730 req = p9_client_rpc(c, P9_TVERSION, "ds", 731 c->msize, "9P2000.L"); 732 break; 733 case p9_proto_2000u: 734 req = p9_client_rpc(c, P9_TVERSION, "ds", 735 c->msize, "9P2000.u"); 736 break; 737 case p9_proto_legacy: 738 req = p9_client_rpc(c, P9_TVERSION, "ds", 739 c->msize, "9P2000"); 740 break; 741 default: 742 return -EINVAL; 743 break; 744 } 745 746 if (IS_ERR(req)) 747 return PTR_ERR(req); 748 749 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version); 750 if (err) { 751 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err); 752 p9pdu_dump(1, req->rc); 753 goto error; 754 } 755 756 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 757 if (!strncmp(version, "9P2000.L", 8)) 758 c->proto_version = p9_proto_2000L; 759 else if (!strncmp(version, "9P2000.u", 8)) 760 c->proto_version = p9_proto_2000u; 761 else if (!strncmp(version, "9P2000", 6)) 762 c->proto_version = p9_proto_legacy; 763 else { 764 err = -EREMOTEIO; 765 goto error; 766 } 767 768 if (msize < c->msize) 769 c->msize = msize; 770 771 error: 772 kfree(version); 773 p9_free_req(c, req); 774 775 return err; 776 } 777 778 struct p9_client *p9_client_create(const char *dev_name, char *options) 779 { 780 int err; 781 struct p9_client *clnt; 782 783 err = 0; 784 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 785 if (!clnt) 786 return ERR_PTR(-ENOMEM); 787 788 clnt->trans_mod = NULL; 789 clnt->trans = NULL; 790 spin_lock_init(&clnt->lock); 791 INIT_LIST_HEAD(&clnt->fidlist); 792 793 err = p9_tag_init(clnt); 794 if (err < 0) 795 goto free_client; 796 797 err = parse_opts(options, clnt); 798 if (err < 0) 799 goto destroy_tagpool; 800 801 if (!clnt->trans_mod) 802 clnt->trans_mod = v9fs_get_default_trans(); 803 804 if (clnt->trans_mod == NULL) { 805 err = -EPROTONOSUPPORT; 806 P9_DPRINTK(P9_DEBUG_ERROR, 807 "No transport defined or default transport\n"); 808 goto destroy_tagpool; 809 } 810 811 clnt->fidpool = p9_idpool_create(); 812 if (IS_ERR(clnt->fidpool)) { 813 err = PTR_ERR(clnt->fidpool); 814 goto put_trans; 815 } 816 817 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 818 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 819 820 err = clnt->trans_mod->create(clnt, dev_name, options); 821 if (err) 822 goto destroy_fidpool; 823 824 if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize) 825 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ; 826 827 err = p9_client_version(clnt); 828 if (err) 829 goto close_trans; 830 831 return clnt; 832 833 close_trans: 834 clnt->trans_mod->close(clnt); 835 destroy_fidpool: 836 p9_idpool_destroy(clnt->fidpool); 837 put_trans: 838 v9fs_put_trans(clnt->trans_mod); 839 destroy_tagpool: 840 p9_idpool_destroy(clnt->tagpool); 841 free_client: 842 kfree(clnt); 843 return ERR_PTR(err); 844 } 845 EXPORT_SYMBOL(p9_client_create); 846 847 void p9_client_destroy(struct p9_client *clnt) 848 { 849 struct p9_fid *fid, *fidptr; 850 851 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt); 852 853 if (clnt->trans_mod) 854 clnt->trans_mod->close(clnt); 855 856 v9fs_put_trans(clnt->trans_mod); 857 858 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) { 859 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid); 860 p9_fid_destroy(fid); 861 } 862 863 if (clnt->fidpool) 864 p9_idpool_destroy(clnt->fidpool); 865 866 p9_tag_cleanup(clnt); 867 868 kfree(clnt); 869 } 870 EXPORT_SYMBOL(p9_client_destroy); 871 872 void p9_client_disconnect(struct p9_client *clnt) 873 { 874 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); 875 clnt->status = Disconnected; 876 } 877 EXPORT_SYMBOL(p9_client_disconnect); 878 879 void p9_client_begin_disconnect(struct p9_client *clnt) 880 { 881 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); 882 clnt->status = BeginDisconnect; 883 } 884 EXPORT_SYMBOL(p9_client_begin_disconnect); 885 886 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 887 char *uname, u32 n_uname, char *aname) 888 { 889 int err; 890 struct p9_req_t *req; 891 struct p9_fid *fid; 892 struct p9_qid qid; 893 894 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 895 afid ? afid->fid : -1, uname, aname); 896 err = 0; 897 898 fid = p9_fid_create(clnt); 899 if (IS_ERR(fid)) { 900 err = PTR_ERR(fid); 901 fid = NULL; 902 goto error; 903 } 904 905 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid, 906 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 907 if (IS_ERR(req)) { 908 err = PTR_ERR(req); 909 goto error; 910 } 911 912 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid); 913 if (err) { 914 p9pdu_dump(1, req->rc); 915 p9_free_req(clnt, req); 916 goto error; 917 } 918 919 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 920 qid.type, 921 (unsigned long long)qid.path, 922 qid.version); 923 924 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 925 926 p9_free_req(clnt, req); 927 return fid; 928 929 error: 930 if (fid) 931 p9_fid_destroy(fid); 932 return ERR_PTR(err); 933 } 934 EXPORT_SYMBOL(p9_client_attach); 935 936 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 937 char **wnames, int clone) 938 { 939 int err; 940 struct p9_client *clnt; 941 struct p9_fid *fid; 942 struct p9_qid *wqids; 943 struct p9_req_t *req; 944 uint16_t nwqids, count; 945 946 err = 0; 947 wqids = NULL; 948 clnt = oldfid->clnt; 949 if (clone) { 950 fid = p9_fid_create(clnt); 951 if (IS_ERR(fid)) { 952 err = PTR_ERR(fid); 953 fid = NULL; 954 goto error; 955 } 956 957 fid->uid = oldfid->uid; 958 } else 959 fid = oldfid; 960 961 962 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 963 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 964 965 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 966 nwname, wnames); 967 if (IS_ERR(req)) { 968 err = PTR_ERR(req); 969 goto error; 970 } 971 972 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids); 973 if (err) { 974 p9pdu_dump(1, req->rc); 975 p9_free_req(clnt, req); 976 goto clunk_fid; 977 } 978 p9_free_req(clnt, req); 979 980 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 981 982 if (nwqids != nwname) { 983 err = -ENOENT; 984 goto clunk_fid; 985 } 986 987 for (count = 0; count < nwqids; count++) 988 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 989 count, wqids[count].type, 990 (unsigned long long)wqids[count].path, 991 wqids[count].version); 992 993 if (nwname) 994 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 995 else 996 fid->qid = oldfid->qid; 997 998 kfree(wqids); 999 return fid; 1000 1001 clunk_fid: 1002 kfree(wqids); 1003 p9_client_clunk(fid); 1004 fid = NULL; 1005 1006 error: 1007 if (fid && (fid != oldfid)) 1008 p9_fid_destroy(fid); 1009 1010 return ERR_PTR(err); 1011 } 1012 EXPORT_SYMBOL(p9_client_walk); 1013 1014 int p9_client_open(struct p9_fid *fid, int mode) 1015 { 1016 int err; 1017 struct p9_client *clnt; 1018 struct p9_req_t *req; 1019 struct p9_qid qid; 1020 int iounit; 1021 1022 clnt = fid->clnt; 1023 P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1024 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1025 err = 0; 1026 1027 if (fid->mode != -1) 1028 return -EINVAL; 1029 1030 if (p9_is_proto_dotl(clnt)) 1031 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1032 else 1033 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1034 if (IS_ERR(req)) { 1035 err = PTR_ERR(req); 1036 goto error; 1037 } 1038 1039 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1040 if (err) { 1041 p9pdu_dump(1, req->rc); 1042 goto free_and_error; 1043 } 1044 1045 P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1046 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1047 (unsigned long long)qid.path, qid.version, iounit); 1048 1049 fid->mode = mode; 1050 fid->iounit = iounit; 1051 1052 free_and_error: 1053 p9_free_req(clnt, req); 1054 error: 1055 return err; 1056 } 1057 EXPORT_SYMBOL(p9_client_open); 1058 1059 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode, 1060 gid_t gid, struct p9_qid *qid) 1061 { 1062 int err = 0; 1063 struct p9_client *clnt; 1064 struct p9_req_t *req; 1065 int iounit; 1066 1067 P9_DPRINTK(P9_DEBUG_9P, 1068 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1069 ofid->fid, name, flags, mode, gid); 1070 clnt = ofid->clnt; 1071 1072 if (ofid->mode != -1) 1073 return -EINVAL; 1074 1075 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags, 1076 mode, gid); 1077 if (IS_ERR(req)) { 1078 err = PTR_ERR(req); 1079 goto error; 1080 } 1081 1082 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit); 1083 if (err) { 1084 p9pdu_dump(1, req->rc); 1085 goto free_and_error; 1086 } 1087 1088 P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1089 qid->type, 1090 (unsigned long long)qid->path, 1091 qid->version, iounit); 1092 1093 ofid->mode = mode; 1094 ofid->iounit = iounit; 1095 1096 free_and_error: 1097 p9_free_req(clnt, req); 1098 error: 1099 return err; 1100 } 1101 EXPORT_SYMBOL(p9_client_create_dotl); 1102 1103 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, 1104 char *extension) 1105 { 1106 int err; 1107 struct p9_client *clnt; 1108 struct p9_req_t *req; 1109 struct p9_qid qid; 1110 int iounit; 1111 1112 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1113 fid->fid, name, perm, mode); 1114 err = 0; 1115 clnt = fid->clnt; 1116 1117 if (fid->mode != -1) 1118 return -EINVAL; 1119 1120 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1121 mode, extension); 1122 if (IS_ERR(req)) { 1123 err = PTR_ERR(req); 1124 goto error; 1125 } 1126 1127 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1128 if (err) { 1129 p9pdu_dump(1, req->rc); 1130 goto free_and_error; 1131 } 1132 1133 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1134 qid.type, 1135 (unsigned long long)qid.path, 1136 qid.version, iounit); 1137 1138 fid->mode = mode; 1139 fid->iounit = iounit; 1140 1141 free_and_error: 1142 p9_free_req(clnt, req); 1143 error: 1144 return err; 1145 } 1146 EXPORT_SYMBOL(p9_client_fcreate); 1147 1148 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid, 1149 struct p9_qid *qid) 1150 { 1151 int err = 0; 1152 struct p9_client *clnt; 1153 struct p9_req_t *req; 1154 1155 P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1156 dfid->fid, name, symtgt); 1157 clnt = dfid->clnt; 1158 1159 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt, 1160 gid); 1161 if (IS_ERR(req)) { 1162 err = PTR_ERR(req); 1163 goto error; 1164 } 1165 1166 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1167 if (err) { 1168 p9pdu_dump(1, req->rc); 1169 goto free_and_error; 1170 } 1171 1172 P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1173 qid->type, (unsigned long long)qid->path, qid->version); 1174 1175 free_and_error: 1176 p9_free_req(clnt, req); 1177 error: 1178 return err; 1179 } 1180 EXPORT_SYMBOL(p9_client_symlink); 1181 1182 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname) 1183 { 1184 struct p9_client *clnt; 1185 struct p9_req_t *req; 1186 1187 P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1188 dfid->fid, oldfid->fid, newname); 1189 clnt = dfid->clnt; 1190 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1191 newname); 1192 if (IS_ERR(req)) 1193 return PTR_ERR(req); 1194 1195 P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n"); 1196 p9_free_req(clnt, req); 1197 return 0; 1198 } 1199 EXPORT_SYMBOL(p9_client_link); 1200 1201 int p9_client_fsync(struct p9_fid *fid, int datasync) 1202 { 1203 int err; 1204 struct p9_client *clnt; 1205 struct p9_req_t *req; 1206 1207 P9_DPRINTK(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1208 fid->fid, datasync); 1209 err = 0; 1210 clnt = fid->clnt; 1211 1212 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1213 if (IS_ERR(req)) { 1214 err = PTR_ERR(req); 1215 goto error; 1216 } 1217 1218 P9_DPRINTK(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1219 1220 p9_free_req(clnt, req); 1221 1222 error: 1223 return err; 1224 } 1225 EXPORT_SYMBOL(p9_client_fsync); 1226 1227 int p9_client_clunk(struct p9_fid *fid) 1228 { 1229 int err; 1230 struct p9_client *clnt; 1231 struct p9_req_t *req; 1232 1233 if (!fid) { 1234 P9_EPRINTK(KERN_WARNING, "Trying to clunk with NULL fid\n"); 1235 dump_stack(); 1236 return 0; 1237 } 1238 1239 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid); 1240 err = 0; 1241 clnt = fid->clnt; 1242 1243 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1244 if (IS_ERR(req)) { 1245 err = PTR_ERR(req); 1246 goto error; 1247 } 1248 1249 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1250 1251 p9_free_req(clnt, req); 1252 p9_fid_destroy(fid); 1253 1254 error: 1255 return err; 1256 } 1257 EXPORT_SYMBOL(p9_client_clunk); 1258 1259 int p9_client_remove(struct p9_fid *fid) 1260 { 1261 int err; 1262 struct p9_client *clnt; 1263 struct p9_req_t *req; 1264 1265 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1266 err = 0; 1267 clnt = fid->clnt; 1268 1269 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1270 if (IS_ERR(req)) { 1271 err = PTR_ERR(req); 1272 goto error; 1273 } 1274 1275 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1276 1277 p9_free_req(clnt, req); 1278 error: 1279 p9_fid_destroy(fid); 1280 return err; 1281 } 1282 EXPORT_SYMBOL(p9_client_remove); 1283 1284 int 1285 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, 1286 u32 count) 1287 { 1288 int err, rsize; 1289 struct p9_client *clnt; 1290 struct p9_req_t *req; 1291 char *dataptr; 1292 1293 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid, 1294 (long long unsigned) offset, count); 1295 err = 0; 1296 clnt = fid->clnt; 1297 1298 rsize = fid->iounit; 1299 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1300 rsize = clnt->msize - P9_IOHDRSZ; 1301 1302 if (count < rsize) 1303 rsize = count; 1304 1305 /* Don't bother zerocopy for small IO (< 1024) */ 1306 if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) == 1307 P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) { 1308 req = p9_client_rpc(clnt, P9_TREAD, "dqE", fid->fid, offset, 1309 rsize, data, udata); 1310 } else { 1311 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1312 rsize); 1313 } 1314 if (IS_ERR(req)) { 1315 err = PTR_ERR(req); 1316 goto error; 1317 } 1318 1319 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 1320 if (err) { 1321 p9pdu_dump(1, req->rc); 1322 goto free_and_error; 1323 } 1324 1325 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1326 1327 if (!req->tc->pbuf_size) { 1328 if (data) { 1329 memmove(data, dataptr, count); 1330 } else { 1331 err = copy_to_user(udata, dataptr, count); 1332 if (err) { 1333 err = -EFAULT; 1334 goto free_and_error; 1335 } 1336 } 1337 } 1338 p9_free_req(clnt, req); 1339 return count; 1340 1341 free_and_error: 1342 p9_free_req(clnt, req); 1343 error: 1344 return err; 1345 } 1346 EXPORT_SYMBOL(p9_client_read); 1347 1348 int 1349 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata, 1350 u64 offset, u32 count) 1351 { 1352 int err, rsize; 1353 struct p9_client *clnt; 1354 struct p9_req_t *req; 1355 1356 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n", 1357 fid->fid, (long long unsigned) offset, count); 1358 err = 0; 1359 clnt = fid->clnt; 1360 1361 rsize = fid->iounit; 1362 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1363 rsize = clnt->msize - P9_IOHDRSZ; 1364 1365 if (count < rsize) 1366 rsize = count; 1367 1368 /* Don't bother zerocopy form small IO (< 1024) */ 1369 if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) == 1370 P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) { 1371 req = p9_client_rpc(clnt, P9_TWRITE, "dqE", fid->fid, offset, 1372 rsize, data, udata); 1373 } else { 1374 1375 if (data) 1376 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, 1377 offset, rsize, data); 1378 else 1379 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, 1380 offset, rsize, udata); 1381 } 1382 if (IS_ERR(req)) { 1383 err = PTR_ERR(req); 1384 goto error; 1385 } 1386 1387 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count); 1388 if (err) { 1389 p9pdu_dump(1, req->rc); 1390 goto free_and_error; 1391 } 1392 1393 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1394 1395 p9_free_req(clnt, req); 1396 return count; 1397 1398 free_and_error: 1399 p9_free_req(clnt, req); 1400 error: 1401 return err; 1402 } 1403 EXPORT_SYMBOL(p9_client_write); 1404 1405 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1406 { 1407 int err; 1408 struct p9_client *clnt; 1409 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1410 struct p9_req_t *req; 1411 u16 ignored; 1412 1413 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1414 1415 if (!ret) 1416 return ERR_PTR(-ENOMEM); 1417 1418 err = 0; 1419 clnt = fid->clnt; 1420 1421 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1422 if (IS_ERR(req)) { 1423 err = PTR_ERR(req); 1424 goto error; 1425 } 1426 1427 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret); 1428 if (err) { 1429 p9pdu_dump(1, req->rc); 1430 p9_free_req(clnt, req); 1431 goto error; 1432 } 1433 1434 P9_DPRINTK(P9_DEBUG_9P, 1435 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1436 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1437 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1438 "<<< uid=%d gid=%d n_muid=%d\n", 1439 ret->size, ret->type, ret->dev, ret->qid.type, 1440 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1441 ret->atime, ret->mtime, (unsigned long long)ret->length, 1442 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1443 ret->n_uid, ret->n_gid, ret->n_muid); 1444 1445 p9_free_req(clnt, req); 1446 return ret; 1447 1448 error: 1449 kfree(ret); 1450 return ERR_PTR(err); 1451 } 1452 EXPORT_SYMBOL(p9_client_stat); 1453 1454 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1455 u64 request_mask) 1456 { 1457 int err; 1458 struct p9_client *clnt; 1459 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1460 GFP_KERNEL); 1461 struct p9_req_t *req; 1462 1463 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1464 fid->fid, request_mask); 1465 1466 if (!ret) 1467 return ERR_PTR(-ENOMEM); 1468 1469 err = 0; 1470 clnt = fid->clnt; 1471 1472 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1473 if (IS_ERR(req)) { 1474 err = PTR_ERR(req); 1475 goto error; 1476 } 1477 1478 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret); 1479 if (err) { 1480 p9pdu_dump(1, req->rc); 1481 p9_free_req(clnt, req); 1482 goto error; 1483 } 1484 1485 P9_DPRINTK(P9_DEBUG_9P, 1486 "<<< RGETATTR st_result_mask=%lld\n" 1487 "<<< qid=%x.%llx.%x\n" 1488 "<<< st_mode=%8.8x st_nlink=%llu\n" 1489 "<<< st_uid=%d st_gid=%d\n" 1490 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1491 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1492 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1493 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1494 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1495 "<<< st_gen=%lld st_data_version=%lld", 1496 ret->st_result_mask, ret->qid.type, ret->qid.path, 1497 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid, 1498 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize, 1499 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1500 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1501 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1502 ret->st_gen, ret->st_data_version); 1503 1504 p9_free_req(clnt, req); 1505 return ret; 1506 1507 error: 1508 kfree(ret); 1509 return ERR_PTR(err); 1510 } 1511 EXPORT_SYMBOL(p9_client_getattr_dotl); 1512 1513 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1514 { 1515 int ret; 1516 1517 /* NOTE: size shouldn't include its own length */ 1518 /* size[2] type[2] dev[4] qid[13] */ 1519 /* mode[4] atime[4] mtime[4] length[8]*/ 1520 /* name[s] uid[s] gid[s] muid[s] */ 1521 ret = 2+4+13+4+4+4+8+2+2+2+2; 1522 1523 if (wst->name) 1524 ret += strlen(wst->name); 1525 if (wst->uid) 1526 ret += strlen(wst->uid); 1527 if (wst->gid) 1528 ret += strlen(wst->gid); 1529 if (wst->muid) 1530 ret += strlen(wst->muid); 1531 1532 if ((proto_version == p9_proto_2000u) || 1533 (proto_version == p9_proto_2000L)) { 1534 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1535 if (wst->extension) 1536 ret += strlen(wst->extension); 1537 } 1538 1539 return ret; 1540 } 1541 1542 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1543 { 1544 int err; 1545 struct p9_req_t *req; 1546 struct p9_client *clnt; 1547 1548 err = 0; 1549 clnt = fid->clnt; 1550 wst->size = p9_client_statsize(wst, clnt->proto_version); 1551 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1552 P9_DPRINTK(P9_DEBUG_9P, 1553 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1554 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1555 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1556 " uid=%d gid=%d n_muid=%d\n", 1557 wst->size, wst->type, wst->dev, wst->qid.type, 1558 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1559 wst->atime, wst->mtime, (unsigned long long)wst->length, 1560 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1561 wst->n_uid, wst->n_gid, wst->n_muid); 1562 1563 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1564 if (IS_ERR(req)) { 1565 err = PTR_ERR(req); 1566 goto error; 1567 } 1568 1569 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1570 1571 p9_free_req(clnt, req); 1572 error: 1573 return err; 1574 } 1575 EXPORT_SYMBOL(p9_client_wstat); 1576 1577 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1578 { 1579 int err; 1580 struct p9_req_t *req; 1581 struct p9_client *clnt; 1582 1583 err = 0; 1584 clnt = fid->clnt; 1585 P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1586 P9_DPRINTK(P9_DEBUG_9P, 1587 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1588 " atime_sec=%lld atime_nsec=%lld\n" 1589 " mtime_sec=%lld mtime_nsec=%lld\n", 1590 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid, 1591 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1592 p9attr->mtime_sec, p9attr->mtime_nsec); 1593 1594 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1595 1596 if (IS_ERR(req)) { 1597 err = PTR_ERR(req); 1598 goto error; 1599 } 1600 P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1601 p9_free_req(clnt, req); 1602 error: 1603 return err; 1604 } 1605 EXPORT_SYMBOL(p9_client_setattr); 1606 1607 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1608 { 1609 int err; 1610 struct p9_req_t *req; 1611 struct p9_client *clnt; 1612 1613 err = 0; 1614 clnt = fid->clnt; 1615 1616 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1617 1618 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1619 if (IS_ERR(req)) { 1620 err = PTR_ERR(req); 1621 goto error; 1622 } 1623 1624 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1625 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1626 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1627 if (err) { 1628 p9pdu_dump(1, req->rc); 1629 p9_free_req(clnt, req); 1630 goto error; 1631 } 1632 1633 P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1634 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1635 "fsid %llu namelen %ld\n", 1636 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1637 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1638 sb->fsid, (long int)sb->namelen); 1639 1640 p9_free_req(clnt, req); 1641 error: 1642 return err; 1643 } 1644 EXPORT_SYMBOL(p9_client_statfs); 1645 1646 int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, char *name) 1647 { 1648 int err; 1649 struct p9_req_t *req; 1650 struct p9_client *clnt; 1651 1652 err = 0; 1653 clnt = fid->clnt; 1654 1655 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1656 fid->fid, newdirfid->fid, name); 1657 1658 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1659 newdirfid->fid, name); 1660 if (IS_ERR(req)) { 1661 err = PTR_ERR(req); 1662 goto error; 1663 } 1664 1665 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1666 1667 p9_free_req(clnt, req); 1668 error: 1669 return err; 1670 } 1671 EXPORT_SYMBOL(p9_client_rename); 1672 1673 /* 1674 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1675 */ 1676 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1677 const char *attr_name, u64 *attr_size) 1678 { 1679 int err; 1680 struct p9_req_t *req; 1681 struct p9_client *clnt; 1682 struct p9_fid *attr_fid; 1683 1684 err = 0; 1685 clnt = file_fid->clnt; 1686 attr_fid = p9_fid_create(clnt); 1687 if (IS_ERR(attr_fid)) { 1688 err = PTR_ERR(attr_fid); 1689 attr_fid = NULL; 1690 goto error; 1691 } 1692 P9_DPRINTK(P9_DEBUG_9P, 1693 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 1694 file_fid->fid, attr_fid->fid, attr_name); 1695 1696 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 1697 file_fid->fid, attr_fid->fid, attr_name); 1698 if (IS_ERR(req)) { 1699 err = PTR_ERR(req); 1700 goto error; 1701 } 1702 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size); 1703 if (err) { 1704 p9pdu_dump(1, req->rc); 1705 p9_free_req(clnt, req); 1706 goto clunk_fid; 1707 } 1708 p9_free_req(clnt, req); 1709 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 1710 attr_fid->fid, *attr_size); 1711 return attr_fid; 1712 clunk_fid: 1713 p9_client_clunk(attr_fid); 1714 attr_fid = NULL; 1715 error: 1716 if (attr_fid && (attr_fid != file_fid)) 1717 p9_fid_destroy(attr_fid); 1718 1719 return ERR_PTR(err); 1720 } 1721 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 1722 1723 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 1724 u64 attr_size, int flags) 1725 { 1726 int err; 1727 struct p9_req_t *req; 1728 struct p9_client *clnt; 1729 1730 P9_DPRINTK(P9_DEBUG_9P, 1731 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 1732 fid->fid, name, (long long)attr_size, flags); 1733 err = 0; 1734 clnt = fid->clnt; 1735 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 1736 fid->fid, name, attr_size, flags); 1737 if (IS_ERR(req)) { 1738 err = PTR_ERR(req); 1739 goto error; 1740 } 1741 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 1742 p9_free_req(clnt, req); 1743 error: 1744 return err; 1745 } 1746 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 1747 1748 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 1749 { 1750 int err, rsize; 1751 struct p9_client *clnt; 1752 struct p9_req_t *req; 1753 char *dataptr; 1754 1755 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 1756 fid->fid, (long long unsigned) offset, count); 1757 1758 err = 0; 1759 clnt = fid->clnt; 1760 1761 rsize = fid->iounit; 1762 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 1763 rsize = clnt->msize - P9_READDIRHDRSZ; 1764 1765 if (count < rsize) 1766 rsize = count; 1767 1768 if ((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) == 1769 P9_TRANS_PREF_PAYLOAD_SEP) { 1770 req = p9_client_rpc(clnt, P9_TREADDIR, "dqF", fid->fid, 1771 offset, rsize, data); 1772 } else { 1773 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 1774 offset, rsize); 1775 } 1776 if (IS_ERR(req)) { 1777 err = PTR_ERR(req); 1778 goto error; 1779 } 1780 1781 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 1782 if (err) { 1783 p9pdu_dump(1, req->rc); 1784 goto free_and_error; 1785 } 1786 1787 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 1788 1789 if (!req->tc->pbuf_size && data) 1790 memmove(data, dataptr, count); 1791 1792 p9_free_req(clnt, req); 1793 return count; 1794 1795 free_and_error: 1796 p9_free_req(clnt, req); 1797 error: 1798 return err; 1799 } 1800 EXPORT_SYMBOL(p9_client_readdir); 1801 1802 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode, 1803 dev_t rdev, gid_t gid, struct p9_qid *qid) 1804 { 1805 int err; 1806 struct p9_client *clnt; 1807 struct p9_req_t *req; 1808 1809 err = 0; 1810 clnt = fid->clnt; 1811 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 1812 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 1813 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode, 1814 MAJOR(rdev), MINOR(rdev), gid); 1815 if (IS_ERR(req)) 1816 return PTR_ERR(req); 1817 1818 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1819 if (err) { 1820 p9pdu_dump(1, req->rc); 1821 goto error; 1822 } 1823 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 1824 (unsigned long long)qid->path, qid->version); 1825 1826 error: 1827 p9_free_req(clnt, req); 1828 return err; 1829 1830 } 1831 EXPORT_SYMBOL(p9_client_mknod_dotl); 1832 1833 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode, 1834 gid_t gid, struct p9_qid *qid) 1835 { 1836 int err; 1837 struct p9_client *clnt; 1838 struct p9_req_t *req; 1839 1840 err = 0; 1841 clnt = fid->clnt; 1842 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 1843 fid->fid, name, mode, gid); 1844 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode, 1845 gid); 1846 if (IS_ERR(req)) 1847 return PTR_ERR(req); 1848 1849 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1850 if (err) { 1851 p9pdu_dump(1, req->rc); 1852 goto error; 1853 } 1854 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 1855 (unsigned long long)qid->path, qid->version); 1856 1857 error: 1858 p9_free_req(clnt, req); 1859 return err; 1860 1861 } 1862 EXPORT_SYMBOL(p9_client_mkdir_dotl); 1863 1864 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 1865 { 1866 int err; 1867 struct p9_client *clnt; 1868 struct p9_req_t *req; 1869 1870 err = 0; 1871 clnt = fid->clnt; 1872 P9_DPRINTK(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " 1873 "start %lld length %lld proc_id %d client_id %s\n", 1874 fid->fid, flock->type, flock->flags, flock->start, 1875 flock->length, flock->proc_id, flock->client_id); 1876 1877 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 1878 flock->flags, flock->start, flock->length, 1879 flock->proc_id, flock->client_id); 1880 1881 if (IS_ERR(req)) 1882 return PTR_ERR(req); 1883 1884 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status); 1885 if (err) { 1886 p9pdu_dump(1, req->rc); 1887 goto error; 1888 } 1889 P9_DPRINTK(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 1890 error: 1891 p9_free_req(clnt, req); 1892 return err; 1893 1894 } 1895 EXPORT_SYMBOL(p9_client_lock_dotl); 1896 1897 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 1898 { 1899 int err; 1900 struct p9_client *clnt; 1901 struct p9_req_t *req; 1902 1903 err = 0; 1904 clnt = fid->clnt; 1905 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " 1906 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, 1907 glock->start, glock->length, glock->proc_id, glock->client_id); 1908 1909 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, 1910 glock->start, glock->length, glock->proc_id, glock->client_id); 1911 1912 if (IS_ERR(req)) 1913 return PTR_ERR(req); 1914 1915 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type, 1916 &glock->start, &glock->length, &glock->proc_id, 1917 &glock->client_id); 1918 if (err) { 1919 p9pdu_dump(1, req->rc); 1920 goto error; 1921 } 1922 P9_DPRINTK(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " 1923 "proc_id %d client_id %s\n", glock->type, glock->start, 1924 glock->length, glock->proc_id, glock->client_id); 1925 error: 1926 p9_free_req(clnt, req); 1927 return err; 1928 } 1929 EXPORT_SYMBOL(p9_client_getlock_dotl); 1930 1931 int p9_client_readlink(struct p9_fid *fid, char **target) 1932 { 1933 int err; 1934 struct p9_client *clnt; 1935 struct p9_req_t *req; 1936 1937 err = 0; 1938 clnt = fid->clnt; 1939 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 1940 1941 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 1942 if (IS_ERR(req)) 1943 return PTR_ERR(req); 1944 1945 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target); 1946 if (err) { 1947 p9pdu_dump(1, req->rc); 1948 goto error; 1949 } 1950 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 1951 error: 1952 p9_free_req(clnt, req); 1953 return err; 1954 } 1955 EXPORT_SYMBOL(p9_client_readlink); 1956