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(char *s) 76 { 77 int version = -EINVAL; 78 79 if (!strcmp(s, "9p2000")) { 80 version = p9_proto_legacy; 81 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: Legacy\n"); 82 } else if (!strcmp(s, "9p2000.u")) { 83 version = p9_proto_2000u; 84 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); 85 } else if (!strcmp(s, "9p2000.L")) { 86 version = p9_proto_2000L; 87 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); 88 } else 89 printk(KERN_INFO "9p: Unknown protocol version %s.\n", s); 90 91 return version; 92 } 93 94 /** 95 * parse_options - parse mount options into client structure 96 * @opts: options string passed from mount 97 * @clnt: existing v9fs client information 98 * 99 * Return 0 upon success, -ERRNO upon failure 100 */ 101 102 static int parse_opts(char *opts, struct p9_client *clnt) 103 { 104 char *options, *tmp_options; 105 char *p; 106 substring_t args[MAX_OPT_ARGS]; 107 int option; 108 char *s; 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 s = match_strdup(&args[0]); 145 if (!s) { 146 ret = -ENOMEM; 147 P9_DPRINTK(P9_DEBUG_ERROR, 148 "problem allocating copy of trans arg\n"); 149 goto free_and_return; 150 } 151 clnt->trans_mod = v9fs_get_trans_by_name(s); 152 if (clnt->trans_mod == NULL) { 153 printk(KERN_INFO 154 "9p: Could not find " 155 "request transport: %s\n", s); 156 ret = -EINVAL; 157 kfree(s); 158 goto free_and_return; 159 } 160 kfree(s); 161 break; 162 case Opt_legacy: 163 clnt->proto_version = p9_proto_legacy; 164 break; 165 case Opt_version: 166 s = match_strdup(&args[0]); 167 if (!s) { 168 ret = -ENOMEM; 169 P9_DPRINTK(P9_DEBUG_ERROR, 170 "problem allocating copy of version arg\n"); 171 goto free_and_return; 172 } 173 ret = get_protocol_version(s); 174 if (ret == -EINVAL) { 175 kfree(s); 176 goto free_and_return; 177 } 178 kfree(s); 179 clnt->proto_version = ret; 180 break; 181 default: 182 continue; 183 } 184 } 185 186 free_and_return: 187 kfree(tmp_options); 188 return ret; 189 } 190 191 /** 192 * p9_tag_alloc - lookup/allocate a request by tag 193 * @c: client session to lookup tag within 194 * @tag: numeric id for transaction 195 * 196 * this is a simple array lookup, but will grow the 197 * request_slots as necessary to accommodate transaction 198 * ids which did not previously have a slot. 199 * 200 * this code relies on the client spinlock to manage locks, its 201 * possible we should switch to something else, but I'd rather 202 * stick with something low-overhead for the common case. 203 * 204 */ 205 206 static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag) 207 { 208 unsigned long flags; 209 int row, col; 210 struct p9_req_t *req; 211 212 /* This looks up the original request by tag so we know which 213 * buffer to read the data into */ 214 tag++; 215 216 if (tag >= c->max_tag) { 217 spin_lock_irqsave(&c->lock, flags); 218 /* check again since original check was outside of lock */ 219 while (tag >= c->max_tag) { 220 row = (tag / P9_ROW_MAXTAG); 221 c->reqs[row] = kcalloc(P9_ROW_MAXTAG, 222 sizeof(struct p9_req_t), GFP_ATOMIC); 223 224 if (!c->reqs[row]) { 225 printk(KERN_ERR "Couldn't grow tag array\n"); 226 spin_unlock_irqrestore(&c->lock, flags); 227 return ERR_PTR(-ENOMEM); 228 } 229 for (col = 0; col < P9_ROW_MAXTAG; col++) { 230 c->reqs[row][col].status = REQ_STATUS_IDLE; 231 c->reqs[row][col].tc = NULL; 232 } 233 c->max_tag += P9_ROW_MAXTAG; 234 } 235 spin_unlock_irqrestore(&c->lock, flags); 236 } 237 row = tag / P9_ROW_MAXTAG; 238 col = tag % P9_ROW_MAXTAG; 239 240 req = &c->reqs[row][col]; 241 if (!req->tc) { 242 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS); 243 if (!req->wq) { 244 printk(KERN_ERR "Couldn't grow tag array\n"); 245 return ERR_PTR(-ENOMEM); 246 } 247 init_waitqueue_head(req->wq); 248 if ((c->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) == 249 P9_TRANS_PREF_PAYLOAD_SEP) { 250 int alloc_msize = min(c->msize, 4096); 251 req->tc = kmalloc(sizeof(struct p9_fcall)+alloc_msize, 252 GFP_NOFS); 253 req->tc->capacity = alloc_msize; 254 req->rc = kmalloc(sizeof(struct p9_fcall)+alloc_msize, 255 GFP_NOFS); 256 req->rc->capacity = alloc_msize; 257 } else { 258 req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize, 259 GFP_NOFS); 260 req->tc->capacity = c->msize; 261 req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize, 262 GFP_NOFS); 263 req->rc->capacity = c->msize; 264 } 265 if ((!req->tc) || (!req->rc)) { 266 printk(KERN_ERR "Couldn't grow tag array\n"); 267 kfree(req->tc); 268 kfree(req->rc); 269 kfree(req->wq); 270 req->tc = req->rc = NULL; 271 req->wq = NULL; 272 return ERR_PTR(-ENOMEM); 273 } 274 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall); 275 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall); 276 } 277 278 p9pdu_reset(req->tc); 279 p9pdu_reset(req->rc); 280 281 req->tc->tag = tag-1; 282 req->status = REQ_STATUS_ALLOC; 283 284 return &c->reqs[row][col]; 285 } 286 287 /** 288 * p9_tag_lookup - lookup a request by tag 289 * @c: client session to lookup tag within 290 * @tag: numeric id for transaction 291 * 292 */ 293 294 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 295 { 296 int row, col; 297 298 /* This looks up the original request by tag so we know which 299 * buffer to read the data into */ 300 tag++; 301 302 if(tag >= c->max_tag) 303 return NULL; 304 305 row = tag / P9_ROW_MAXTAG; 306 col = tag % P9_ROW_MAXTAG; 307 308 return &c->reqs[row][col]; 309 } 310 EXPORT_SYMBOL(p9_tag_lookup); 311 312 /** 313 * p9_tag_init - setup tags structure and contents 314 * @c: v9fs client struct 315 * 316 * This initializes the tags structure for each client instance. 317 * 318 */ 319 320 static int p9_tag_init(struct p9_client *c) 321 { 322 int err = 0; 323 324 c->tagpool = p9_idpool_create(); 325 if (IS_ERR(c->tagpool)) { 326 err = PTR_ERR(c->tagpool); 327 goto error; 328 } 329 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */ 330 if (err < 0) { 331 p9_idpool_destroy(c->tagpool); 332 goto error; 333 } 334 c->max_tag = 0; 335 error: 336 return err; 337 } 338 339 /** 340 * p9_tag_cleanup - cleans up tags structure and reclaims resources 341 * @c: v9fs client struct 342 * 343 * This frees resources associated with the tags structure 344 * 345 */ 346 static void p9_tag_cleanup(struct p9_client *c) 347 { 348 int row, col; 349 350 /* check to insure all requests are idle */ 351 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 352 for (col = 0; col < P9_ROW_MAXTAG; col++) { 353 if (c->reqs[row][col].status != REQ_STATUS_IDLE) { 354 P9_DPRINTK(P9_DEBUG_MUX, 355 "Attempting to cleanup non-free tag %d,%d\n", 356 row, col); 357 /* TODO: delay execution of cleanup */ 358 return; 359 } 360 } 361 } 362 363 if (c->tagpool) { 364 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */ 365 p9_idpool_destroy(c->tagpool); 366 } 367 368 /* free requests associated with tags */ 369 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 370 for (col = 0; col < P9_ROW_MAXTAG; col++) { 371 kfree(c->reqs[row][col].wq); 372 kfree(c->reqs[row][col].tc); 373 kfree(c->reqs[row][col].rc); 374 } 375 kfree(c->reqs[row]); 376 } 377 c->max_tag = 0; 378 } 379 380 /** 381 * p9_free_req - free a request and clean-up as necessary 382 * c: client state 383 * r: request to release 384 * 385 */ 386 387 static void p9_free_req(struct p9_client *c, struct p9_req_t *r) 388 { 389 int tag = r->tc->tag; 390 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); 391 392 r->status = REQ_STATUS_IDLE; 393 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool)) 394 p9_idpool_put(tag, c->tagpool); 395 } 396 397 /** 398 * p9_client_cb - call back from transport to client 399 * c: client state 400 * req: request received 401 * 402 */ 403 void p9_client_cb(struct p9_client *c, struct p9_req_t *req) 404 { 405 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag); 406 wake_up(req->wq); 407 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag); 408 } 409 EXPORT_SYMBOL(p9_client_cb); 410 411 /** 412 * p9_parse_header - parse header arguments out of a packet 413 * @pdu: packet to parse 414 * @size: size of packet 415 * @type: type of request 416 * @tag: tag of packet 417 * @rewind: set if we need to rewind offset afterwards 418 */ 419 420 int 421 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, 422 int rewind) 423 { 424 int8_t r_type; 425 int16_t r_tag; 426 int32_t r_size; 427 int offset = pdu->offset; 428 int err; 429 430 pdu->offset = 0; 431 if (pdu->size == 0) 432 pdu->size = 7; 433 434 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 435 if (err) 436 goto rewind_and_exit; 437 438 pdu->size = r_size; 439 pdu->id = r_type; 440 pdu->tag = r_tag; 441 442 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size, 443 pdu->id, pdu->tag); 444 445 if (type) 446 *type = r_type; 447 if (tag) 448 *tag = r_tag; 449 if (size) 450 *size = r_size; 451 452 453 rewind_and_exit: 454 if (rewind) 455 pdu->offset = offset; 456 return err; 457 } 458 EXPORT_SYMBOL(p9_parse_header); 459 460 /** 461 * p9_check_errors - check 9p packet for error return and process it 462 * @c: current client instance 463 * @req: request to parse and check for error conditions 464 * 465 * returns error code if one is discovered, otherwise returns 0 466 * 467 * this will have to be more complicated if we have multiple 468 * error packet types 469 */ 470 471 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 472 { 473 int8_t type; 474 int err; 475 int ecode; 476 477 err = p9_parse_header(req->rc, NULL, &type, NULL, 0); 478 if (err) { 479 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 480 return err; 481 } 482 483 if (type != P9_RERROR && type != P9_RLERROR) 484 return 0; 485 486 if (!p9_is_proto_dotl(c)) { 487 char *ename; 488 489 if (req->tc->pbuf_size) { 490 /* Handle user buffers */ 491 size_t len = req->rc->size - req->rc->offset; 492 if (req->tc->pubuf) { 493 /* User Buffer */ 494 err = copy_from_user( 495 &req->rc->sdata[req->rc->offset], 496 req->tc->pubuf, len); 497 if (err) { 498 err = -EFAULT; 499 goto out_err; 500 } 501 } else { 502 /* Kernel Buffer */ 503 memmove(&req->rc->sdata[req->rc->offset], 504 req->tc->pkbuf, len); 505 } 506 } 507 err = p9pdu_readf(req->rc, c->proto_version, "s?d", 508 &ename, &ecode); 509 if (err) 510 goto out_err; 511 512 if (p9_is_proto_dotu(c)) 513 err = -ecode; 514 515 if (!err || !IS_ERR_VALUE(err)) { 516 err = p9_errstr2errno(ename, strlen(ename)); 517 518 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, 519 ename); 520 521 kfree(ename); 522 } 523 } else { 524 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); 525 err = -ecode; 526 527 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 528 } 529 530 531 return err; 532 533 out_err: 534 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 535 536 return err; 537 } 538 539 static struct p9_req_t * 540 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 541 542 /** 543 * p9_client_flush - flush (cancel) a request 544 * @c: client state 545 * @oldreq: request to cancel 546 * 547 * This sents a flush for a particular request and links 548 * the flush request to the original request. The current 549 * code only supports a single flush request although the protocol 550 * allows for multiple flush requests to be sent for a single request. 551 * 552 */ 553 554 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 555 { 556 struct p9_req_t *req; 557 int16_t oldtag; 558 int err; 559 560 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); 561 if (err) 562 return err; 563 564 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 565 566 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 567 if (IS_ERR(req)) 568 return PTR_ERR(req); 569 570 571 /* if we haven't received a response for oldreq, 572 remove it from the list. */ 573 spin_lock(&c->lock); 574 if (oldreq->status == REQ_STATUS_FLSH) 575 list_del(&oldreq->req_list); 576 spin_unlock(&c->lock); 577 578 p9_free_req(c, req); 579 return 0; 580 } 581 582 /** 583 * p9_client_rpc - issue a request and wait for a response 584 * @c: client session 585 * @type: type of request 586 * @fmt: protocol format string (see protocol.c) 587 * 588 * Returns request structure (which client must free using p9_free_req) 589 */ 590 591 static struct p9_req_t * 592 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 593 { 594 va_list ap; 595 int tag, err; 596 struct p9_req_t *req; 597 unsigned long flags; 598 int sigpending; 599 600 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type); 601 602 /* we allow for any status other than disconnected */ 603 if (c->status == Disconnected) 604 return ERR_PTR(-EIO); 605 606 /* if status is begin_disconnected we allow only clunk request */ 607 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) 608 return ERR_PTR(-EIO); 609 610 if (signal_pending(current)) { 611 sigpending = 1; 612 clear_thread_flag(TIF_SIGPENDING); 613 } else 614 sigpending = 0; 615 616 tag = P9_NOTAG; 617 if (type != P9_TVERSION) { 618 tag = p9_idpool_get(c->tagpool); 619 if (tag < 0) 620 return ERR_PTR(-ENOMEM); 621 } 622 623 req = p9_tag_alloc(c, tag); 624 if (IS_ERR(req)) 625 return req; 626 627 /* marshall the data */ 628 p9pdu_prepare(req->tc, tag, type); 629 va_start(ap, fmt); 630 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap); 631 va_end(ap); 632 if (err) 633 goto reterr; 634 p9pdu_finalize(req->tc); 635 636 err = c->trans_mod->request(c, req); 637 if (err < 0) { 638 if (err != -ERESTARTSYS && err != -EFAULT) 639 c->status = Disconnected; 640 goto reterr; 641 } 642 643 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag); 644 err = wait_event_interruptible(*req->wq, 645 req->status >= REQ_STATUS_RCVD); 646 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n", 647 req->wq, tag, err); 648 649 if (req->status == REQ_STATUS_ERROR) { 650 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 651 err = req->t_err; 652 } 653 654 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 655 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n"); 656 sigpending = 1; 657 clear_thread_flag(TIF_SIGPENDING); 658 659 if (c->trans_mod->cancel(c, req)) 660 p9_client_flush(c, req); 661 662 /* if we received the response anyway, don't signal error */ 663 if (req->status == REQ_STATUS_RCVD) 664 err = 0; 665 } 666 667 if (sigpending) { 668 spin_lock_irqsave(¤t->sighand->siglock, flags); 669 recalc_sigpending(); 670 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 671 } 672 673 if (err < 0) 674 goto reterr; 675 676 err = p9_check_errors(c, req); 677 if (!err) { 678 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type); 679 return req; 680 } 681 682 reterr: 683 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type, 684 err); 685 p9_free_req(c, req); 686 return ERR_PTR(err); 687 } 688 689 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 690 { 691 int ret; 692 struct p9_fid *fid; 693 unsigned long flags; 694 695 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt); 696 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 697 if (!fid) 698 return ERR_PTR(-ENOMEM); 699 700 ret = p9_idpool_get(clnt->fidpool); 701 if (ret < 0) { 702 ret = -ENOSPC; 703 goto error; 704 } 705 fid->fid = ret; 706 707 memset(&fid->qid, 0, sizeof(struct p9_qid)); 708 fid->mode = -1; 709 fid->uid = current_fsuid(); 710 fid->clnt = clnt; 711 fid->rdir = NULL; 712 spin_lock_irqsave(&clnt->lock, flags); 713 list_add(&fid->flist, &clnt->fidlist); 714 spin_unlock_irqrestore(&clnt->lock, flags); 715 716 return fid; 717 718 error: 719 kfree(fid); 720 return ERR_PTR(ret); 721 } 722 723 static void p9_fid_destroy(struct p9_fid *fid) 724 { 725 struct p9_client *clnt; 726 unsigned long flags; 727 728 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid); 729 clnt = fid->clnt; 730 p9_idpool_put(fid->fid, clnt->fidpool); 731 spin_lock_irqsave(&clnt->lock, flags); 732 list_del(&fid->flist); 733 spin_unlock_irqrestore(&clnt->lock, flags); 734 kfree(fid->rdir); 735 kfree(fid); 736 } 737 738 static int p9_client_version(struct p9_client *c) 739 { 740 int err = 0; 741 struct p9_req_t *req; 742 char *version; 743 int msize; 744 745 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 746 c->msize, c->proto_version); 747 748 switch (c->proto_version) { 749 case p9_proto_2000L: 750 req = p9_client_rpc(c, P9_TVERSION, "ds", 751 c->msize, "9P2000.L"); 752 break; 753 case p9_proto_2000u: 754 req = p9_client_rpc(c, P9_TVERSION, "ds", 755 c->msize, "9P2000.u"); 756 break; 757 case p9_proto_legacy: 758 req = p9_client_rpc(c, P9_TVERSION, "ds", 759 c->msize, "9P2000"); 760 break; 761 default: 762 return -EINVAL; 763 break; 764 } 765 766 if (IS_ERR(req)) 767 return PTR_ERR(req); 768 769 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version); 770 if (err) { 771 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err); 772 P9_DUMP_PKT(1, req->rc); 773 goto error; 774 } 775 776 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 777 if (!strncmp(version, "9P2000.L", 8)) 778 c->proto_version = p9_proto_2000L; 779 else if (!strncmp(version, "9P2000.u", 8)) 780 c->proto_version = p9_proto_2000u; 781 else if (!strncmp(version, "9P2000", 6)) 782 c->proto_version = p9_proto_legacy; 783 else { 784 err = -EREMOTEIO; 785 goto error; 786 } 787 788 if (msize < c->msize) 789 c->msize = msize; 790 791 error: 792 kfree(version); 793 p9_free_req(c, req); 794 795 return err; 796 } 797 798 struct p9_client *p9_client_create(const char *dev_name, char *options) 799 { 800 int err; 801 struct p9_client *clnt; 802 803 err = 0; 804 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 805 if (!clnt) 806 return ERR_PTR(-ENOMEM); 807 808 clnt->trans_mod = NULL; 809 clnt->trans = NULL; 810 spin_lock_init(&clnt->lock); 811 INIT_LIST_HEAD(&clnt->fidlist); 812 813 err = p9_tag_init(clnt); 814 if (err < 0) 815 goto free_client; 816 817 err = parse_opts(options, clnt); 818 if (err < 0) 819 goto destroy_tagpool; 820 821 if (!clnt->trans_mod) 822 clnt->trans_mod = v9fs_get_default_trans(); 823 824 if (clnt->trans_mod == NULL) { 825 err = -EPROTONOSUPPORT; 826 P9_DPRINTK(P9_DEBUG_ERROR, 827 "No transport defined or default transport\n"); 828 goto destroy_tagpool; 829 } 830 831 clnt->fidpool = p9_idpool_create(); 832 if (IS_ERR(clnt->fidpool)) { 833 err = PTR_ERR(clnt->fidpool); 834 goto put_trans; 835 } 836 837 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 838 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 839 840 err = clnt->trans_mod->create(clnt, dev_name, options); 841 if (err) 842 goto destroy_fidpool; 843 844 if (clnt->msize > clnt->trans_mod->maxsize) 845 clnt->msize = clnt->trans_mod->maxsize; 846 847 err = p9_client_version(clnt); 848 if (err) 849 goto close_trans; 850 851 return clnt; 852 853 close_trans: 854 clnt->trans_mod->close(clnt); 855 destroy_fidpool: 856 p9_idpool_destroy(clnt->fidpool); 857 put_trans: 858 v9fs_put_trans(clnt->trans_mod); 859 destroy_tagpool: 860 p9_idpool_destroy(clnt->tagpool); 861 free_client: 862 kfree(clnt); 863 return ERR_PTR(err); 864 } 865 EXPORT_SYMBOL(p9_client_create); 866 867 void p9_client_destroy(struct p9_client *clnt) 868 { 869 struct p9_fid *fid, *fidptr; 870 871 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt); 872 873 if (clnt->trans_mod) 874 clnt->trans_mod->close(clnt); 875 876 v9fs_put_trans(clnt->trans_mod); 877 878 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) { 879 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid); 880 p9_fid_destroy(fid); 881 } 882 883 if (clnt->fidpool) 884 p9_idpool_destroy(clnt->fidpool); 885 886 p9_tag_cleanup(clnt); 887 888 kfree(clnt); 889 } 890 EXPORT_SYMBOL(p9_client_destroy); 891 892 void p9_client_disconnect(struct p9_client *clnt) 893 { 894 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); 895 clnt->status = Disconnected; 896 } 897 EXPORT_SYMBOL(p9_client_disconnect); 898 899 void p9_client_begin_disconnect(struct p9_client *clnt) 900 { 901 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); 902 clnt->status = BeginDisconnect; 903 } 904 EXPORT_SYMBOL(p9_client_begin_disconnect); 905 906 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 907 char *uname, u32 n_uname, char *aname) 908 { 909 int err; 910 struct p9_req_t *req; 911 struct p9_fid *fid; 912 struct p9_qid qid; 913 914 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 915 afid ? afid->fid : -1, uname, aname); 916 err = 0; 917 918 fid = p9_fid_create(clnt); 919 if (IS_ERR(fid)) { 920 err = PTR_ERR(fid); 921 fid = NULL; 922 goto error; 923 } 924 925 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid, 926 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 927 if (IS_ERR(req)) { 928 err = PTR_ERR(req); 929 goto error; 930 } 931 932 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid); 933 if (err) { 934 P9_DUMP_PKT(1, req->rc); 935 p9_free_req(clnt, req); 936 goto error; 937 } 938 939 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 940 qid.type, 941 (unsigned long long)qid.path, 942 qid.version); 943 944 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 945 946 p9_free_req(clnt, req); 947 return fid; 948 949 error: 950 if (fid) 951 p9_fid_destroy(fid); 952 return ERR_PTR(err); 953 } 954 EXPORT_SYMBOL(p9_client_attach); 955 956 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 957 char **wnames, int clone) 958 { 959 int err; 960 struct p9_client *clnt; 961 struct p9_fid *fid; 962 struct p9_qid *wqids; 963 struct p9_req_t *req; 964 uint16_t nwqids, count; 965 966 err = 0; 967 wqids = NULL; 968 clnt = oldfid->clnt; 969 if (clone) { 970 fid = p9_fid_create(clnt); 971 if (IS_ERR(fid)) { 972 err = PTR_ERR(fid); 973 fid = NULL; 974 goto error; 975 } 976 977 fid->uid = oldfid->uid; 978 } else 979 fid = oldfid; 980 981 982 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 983 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 984 985 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 986 nwname, wnames); 987 if (IS_ERR(req)) { 988 err = PTR_ERR(req); 989 goto error; 990 } 991 992 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids); 993 if (err) { 994 P9_DUMP_PKT(1, req->rc); 995 p9_free_req(clnt, req); 996 goto clunk_fid; 997 } 998 p9_free_req(clnt, req); 999 1000 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1001 1002 if (nwqids != nwname) { 1003 err = -ENOENT; 1004 goto clunk_fid; 1005 } 1006 1007 for (count = 0; count < nwqids; count++) 1008 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1009 count, wqids[count].type, 1010 (unsigned long long)wqids[count].path, 1011 wqids[count].version); 1012 1013 if (nwname) 1014 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1015 else 1016 fid->qid = oldfid->qid; 1017 1018 kfree(wqids); 1019 return fid; 1020 1021 clunk_fid: 1022 kfree(wqids); 1023 p9_client_clunk(fid); 1024 fid = NULL; 1025 1026 error: 1027 if (fid && (fid != oldfid)) 1028 p9_fid_destroy(fid); 1029 1030 return ERR_PTR(err); 1031 } 1032 EXPORT_SYMBOL(p9_client_walk); 1033 1034 int p9_client_open(struct p9_fid *fid, int mode) 1035 { 1036 int err; 1037 struct p9_client *clnt; 1038 struct p9_req_t *req; 1039 struct p9_qid qid; 1040 int iounit; 1041 1042 clnt = fid->clnt; 1043 P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1044 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1045 err = 0; 1046 1047 if (fid->mode != -1) 1048 return -EINVAL; 1049 1050 if (p9_is_proto_dotl(clnt)) 1051 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1052 else 1053 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1054 if (IS_ERR(req)) { 1055 err = PTR_ERR(req); 1056 goto error; 1057 } 1058 1059 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1060 if (err) { 1061 P9_DUMP_PKT(1, req->rc); 1062 goto free_and_error; 1063 } 1064 1065 P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1066 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1067 (unsigned long long)qid.path, qid.version, iounit); 1068 1069 fid->mode = mode; 1070 fid->iounit = iounit; 1071 1072 free_and_error: 1073 p9_free_req(clnt, req); 1074 error: 1075 return err; 1076 } 1077 EXPORT_SYMBOL(p9_client_open); 1078 1079 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode, 1080 gid_t gid, struct p9_qid *qid) 1081 { 1082 int err = 0; 1083 struct p9_client *clnt; 1084 struct p9_req_t *req; 1085 int iounit; 1086 1087 P9_DPRINTK(P9_DEBUG_9P, 1088 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1089 ofid->fid, name, flags, mode, gid); 1090 clnt = ofid->clnt; 1091 1092 if (ofid->mode != -1) 1093 return -EINVAL; 1094 1095 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags, 1096 mode, gid); 1097 if (IS_ERR(req)) { 1098 err = PTR_ERR(req); 1099 goto error; 1100 } 1101 1102 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit); 1103 if (err) { 1104 P9_DUMP_PKT(1, req->rc); 1105 goto free_and_error; 1106 } 1107 1108 P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1109 qid->type, 1110 (unsigned long long)qid->path, 1111 qid->version, iounit); 1112 1113 ofid->mode = mode; 1114 ofid->iounit = iounit; 1115 1116 free_and_error: 1117 p9_free_req(clnt, req); 1118 error: 1119 return err; 1120 } 1121 EXPORT_SYMBOL(p9_client_create_dotl); 1122 1123 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, 1124 char *extension) 1125 { 1126 int err; 1127 struct p9_client *clnt; 1128 struct p9_req_t *req; 1129 struct p9_qid qid; 1130 int iounit; 1131 1132 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1133 fid->fid, name, perm, mode); 1134 err = 0; 1135 clnt = fid->clnt; 1136 1137 if (fid->mode != -1) 1138 return -EINVAL; 1139 1140 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1141 mode, extension); 1142 if (IS_ERR(req)) { 1143 err = PTR_ERR(req); 1144 goto error; 1145 } 1146 1147 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1148 if (err) { 1149 P9_DUMP_PKT(1, req->rc); 1150 goto free_and_error; 1151 } 1152 1153 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1154 qid.type, 1155 (unsigned long long)qid.path, 1156 qid.version, iounit); 1157 1158 fid->mode = mode; 1159 fid->iounit = iounit; 1160 1161 free_and_error: 1162 p9_free_req(clnt, req); 1163 error: 1164 return err; 1165 } 1166 EXPORT_SYMBOL(p9_client_fcreate); 1167 1168 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid, 1169 struct p9_qid *qid) 1170 { 1171 int err = 0; 1172 struct p9_client *clnt; 1173 struct p9_req_t *req; 1174 1175 P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1176 dfid->fid, name, symtgt); 1177 clnt = dfid->clnt; 1178 1179 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt, 1180 gid); 1181 if (IS_ERR(req)) { 1182 err = PTR_ERR(req); 1183 goto error; 1184 } 1185 1186 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1187 if (err) { 1188 P9_DUMP_PKT(1, req->rc); 1189 goto free_and_error; 1190 } 1191 1192 P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1193 qid->type, (unsigned long long)qid->path, qid->version); 1194 1195 free_and_error: 1196 p9_free_req(clnt, req); 1197 error: 1198 return err; 1199 } 1200 EXPORT_SYMBOL(p9_client_symlink); 1201 1202 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname) 1203 { 1204 struct p9_client *clnt; 1205 struct p9_req_t *req; 1206 1207 P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1208 dfid->fid, oldfid->fid, newname); 1209 clnt = dfid->clnt; 1210 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1211 newname); 1212 if (IS_ERR(req)) 1213 return PTR_ERR(req); 1214 1215 P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n"); 1216 p9_free_req(clnt, req); 1217 return 0; 1218 } 1219 EXPORT_SYMBOL(p9_client_link); 1220 1221 int p9_client_fsync(struct p9_fid *fid, int datasync) 1222 { 1223 int err; 1224 struct p9_client *clnt; 1225 struct p9_req_t *req; 1226 1227 P9_DPRINTK(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1228 fid->fid, datasync); 1229 err = 0; 1230 clnt = fid->clnt; 1231 1232 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1233 if (IS_ERR(req)) { 1234 err = PTR_ERR(req); 1235 goto error; 1236 } 1237 1238 P9_DPRINTK(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1239 1240 p9_free_req(clnt, req); 1241 1242 error: 1243 return err; 1244 } 1245 EXPORT_SYMBOL(p9_client_fsync); 1246 1247 int p9_client_clunk(struct p9_fid *fid) 1248 { 1249 int err; 1250 struct p9_client *clnt; 1251 struct p9_req_t *req; 1252 1253 if (!fid) { 1254 P9_EPRINTK(KERN_WARNING, "Trying to clunk with NULL fid\n"); 1255 dump_stack(); 1256 return 0; 1257 } 1258 1259 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid); 1260 err = 0; 1261 clnt = fid->clnt; 1262 1263 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1264 if (IS_ERR(req)) { 1265 err = PTR_ERR(req); 1266 goto error; 1267 } 1268 1269 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1270 1271 p9_free_req(clnt, req); 1272 error: 1273 /* 1274 * Fid is not valid even after a failed clunk 1275 */ 1276 p9_fid_destroy(fid); 1277 return err; 1278 } 1279 EXPORT_SYMBOL(p9_client_clunk); 1280 1281 int p9_client_remove(struct p9_fid *fid) 1282 { 1283 int err; 1284 struct p9_client *clnt; 1285 struct p9_req_t *req; 1286 1287 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1288 err = 0; 1289 clnt = fid->clnt; 1290 1291 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1292 if (IS_ERR(req)) { 1293 err = PTR_ERR(req); 1294 goto error; 1295 } 1296 1297 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1298 1299 p9_free_req(clnt, req); 1300 error: 1301 p9_fid_destroy(fid); 1302 return err; 1303 } 1304 EXPORT_SYMBOL(p9_client_remove); 1305 1306 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1307 { 1308 int err = 0; 1309 struct p9_req_t *req; 1310 struct p9_client *clnt; 1311 1312 P9_DPRINTK(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1313 dfid->fid, name, flags); 1314 1315 clnt = dfid->clnt; 1316 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1317 if (IS_ERR(req)) { 1318 err = PTR_ERR(req); 1319 goto error; 1320 } 1321 P9_DPRINTK(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1322 1323 p9_free_req(clnt, req); 1324 error: 1325 return err; 1326 } 1327 EXPORT_SYMBOL(p9_client_unlinkat); 1328 1329 int 1330 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, 1331 u32 count) 1332 { 1333 int err, rsize; 1334 struct p9_client *clnt; 1335 struct p9_req_t *req; 1336 char *dataptr; 1337 1338 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid, 1339 (long long unsigned) offset, count); 1340 err = 0; 1341 clnt = fid->clnt; 1342 1343 rsize = fid->iounit; 1344 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1345 rsize = clnt->msize - P9_IOHDRSZ; 1346 1347 if (count < rsize) 1348 rsize = count; 1349 1350 /* Don't bother zerocopy for small IO (< 1024) */ 1351 if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) == 1352 P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) { 1353 req = p9_client_rpc(clnt, P9_TREAD, "dqE", fid->fid, offset, 1354 rsize, data, udata); 1355 } else { 1356 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1357 rsize); 1358 } 1359 if (IS_ERR(req)) { 1360 err = PTR_ERR(req); 1361 goto error; 1362 } 1363 1364 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 1365 if (err) { 1366 P9_DUMP_PKT(1, req->rc); 1367 goto free_and_error; 1368 } 1369 1370 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1371 P9_DUMP_PKT(1, req->rc); 1372 1373 if (!req->tc->pbuf_size) { 1374 if (data) { 1375 memmove(data, dataptr, count); 1376 } else { 1377 err = copy_to_user(udata, dataptr, count); 1378 if (err) { 1379 err = -EFAULT; 1380 goto free_and_error; 1381 } 1382 } 1383 } 1384 p9_free_req(clnt, req); 1385 return count; 1386 1387 free_and_error: 1388 p9_free_req(clnt, req); 1389 error: 1390 return err; 1391 } 1392 EXPORT_SYMBOL(p9_client_read); 1393 1394 int 1395 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata, 1396 u64 offset, u32 count) 1397 { 1398 int err, rsize; 1399 struct p9_client *clnt; 1400 struct p9_req_t *req; 1401 1402 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n", 1403 fid->fid, (long long unsigned) offset, count); 1404 err = 0; 1405 clnt = fid->clnt; 1406 1407 rsize = fid->iounit; 1408 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1409 rsize = clnt->msize - P9_IOHDRSZ; 1410 1411 if (count < rsize) 1412 rsize = count; 1413 1414 /* Don't bother zerocopy form small IO (< 1024) */ 1415 if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) == 1416 P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) { 1417 req = p9_client_rpc(clnt, P9_TWRITE, "dqE", fid->fid, offset, 1418 rsize, data, udata); 1419 } else { 1420 1421 if (data) 1422 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, 1423 offset, rsize, data); 1424 else 1425 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, 1426 offset, rsize, udata); 1427 } 1428 if (IS_ERR(req)) { 1429 err = PTR_ERR(req); 1430 goto error; 1431 } 1432 1433 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count); 1434 if (err) { 1435 P9_DUMP_PKT(1, req->rc); 1436 goto free_and_error; 1437 } 1438 1439 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1440 1441 p9_free_req(clnt, req); 1442 return count; 1443 1444 free_and_error: 1445 p9_free_req(clnt, req); 1446 error: 1447 return err; 1448 } 1449 EXPORT_SYMBOL(p9_client_write); 1450 1451 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1452 { 1453 int err; 1454 struct p9_client *clnt; 1455 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1456 struct p9_req_t *req; 1457 u16 ignored; 1458 1459 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1460 1461 if (!ret) 1462 return ERR_PTR(-ENOMEM); 1463 1464 err = 0; 1465 clnt = fid->clnt; 1466 1467 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1468 if (IS_ERR(req)) { 1469 err = PTR_ERR(req); 1470 goto error; 1471 } 1472 1473 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret); 1474 if (err) { 1475 P9_DUMP_PKT(1, req->rc); 1476 p9_free_req(clnt, req); 1477 goto error; 1478 } 1479 1480 P9_DPRINTK(P9_DEBUG_9P, 1481 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1482 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1483 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1484 "<<< uid=%d gid=%d n_muid=%d\n", 1485 ret->size, ret->type, ret->dev, ret->qid.type, 1486 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1487 ret->atime, ret->mtime, (unsigned long long)ret->length, 1488 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1489 ret->n_uid, ret->n_gid, ret->n_muid); 1490 1491 p9_free_req(clnt, req); 1492 return ret; 1493 1494 error: 1495 kfree(ret); 1496 return ERR_PTR(err); 1497 } 1498 EXPORT_SYMBOL(p9_client_stat); 1499 1500 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1501 u64 request_mask) 1502 { 1503 int err; 1504 struct p9_client *clnt; 1505 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1506 GFP_KERNEL); 1507 struct p9_req_t *req; 1508 1509 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1510 fid->fid, request_mask); 1511 1512 if (!ret) 1513 return ERR_PTR(-ENOMEM); 1514 1515 err = 0; 1516 clnt = fid->clnt; 1517 1518 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1519 if (IS_ERR(req)) { 1520 err = PTR_ERR(req); 1521 goto error; 1522 } 1523 1524 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret); 1525 if (err) { 1526 P9_DUMP_PKT(1, req->rc); 1527 p9_free_req(clnt, req); 1528 goto error; 1529 } 1530 1531 P9_DPRINTK(P9_DEBUG_9P, 1532 "<<< RGETATTR st_result_mask=%lld\n" 1533 "<<< qid=%x.%llx.%x\n" 1534 "<<< st_mode=%8.8x st_nlink=%llu\n" 1535 "<<< st_uid=%d st_gid=%d\n" 1536 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1537 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1538 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1539 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1540 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1541 "<<< st_gen=%lld st_data_version=%lld", 1542 ret->st_result_mask, ret->qid.type, ret->qid.path, 1543 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid, 1544 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize, 1545 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1546 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1547 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1548 ret->st_gen, ret->st_data_version); 1549 1550 p9_free_req(clnt, req); 1551 return ret; 1552 1553 error: 1554 kfree(ret); 1555 return ERR_PTR(err); 1556 } 1557 EXPORT_SYMBOL(p9_client_getattr_dotl); 1558 1559 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1560 { 1561 int ret; 1562 1563 /* NOTE: size shouldn't include its own length */ 1564 /* size[2] type[2] dev[4] qid[13] */ 1565 /* mode[4] atime[4] mtime[4] length[8]*/ 1566 /* name[s] uid[s] gid[s] muid[s] */ 1567 ret = 2+4+13+4+4+4+8+2+2+2+2; 1568 1569 if (wst->name) 1570 ret += strlen(wst->name); 1571 if (wst->uid) 1572 ret += strlen(wst->uid); 1573 if (wst->gid) 1574 ret += strlen(wst->gid); 1575 if (wst->muid) 1576 ret += strlen(wst->muid); 1577 1578 if ((proto_version == p9_proto_2000u) || 1579 (proto_version == p9_proto_2000L)) { 1580 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1581 if (wst->extension) 1582 ret += strlen(wst->extension); 1583 } 1584 1585 return ret; 1586 } 1587 1588 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1589 { 1590 int err; 1591 struct p9_req_t *req; 1592 struct p9_client *clnt; 1593 1594 err = 0; 1595 clnt = fid->clnt; 1596 wst->size = p9_client_statsize(wst, clnt->proto_version); 1597 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1598 P9_DPRINTK(P9_DEBUG_9P, 1599 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1600 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1601 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1602 " uid=%d gid=%d n_muid=%d\n", 1603 wst->size, wst->type, wst->dev, wst->qid.type, 1604 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1605 wst->atime, wst->mtime, (unsigned long long)wst->length, 1606 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1607 wst->n_uid, wst->n_gid, wst->n_muid); 1608 1609 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1610 if (IS_ERR(req)) { 1611 err = PTR_ERR(req); 1612 goto error; 1613 } 1614 1615 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1616 1617 p9_free_req(clnt, req); 1618 error: 1619 return err; 1620 } 1621 EXPORT_SYMBOL(p9_client_wstat); 1622 1623 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1624 { 1625 int err; 1626 struct p9_req_t *req; 1627 struct p9_client *clnt; 1628 1629 err = 0; 1630 clnt = fid->clnt; 1631 P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1632 P9_DPRINTK(P9_DEBUG_9P, 1633 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1634 " atime_sec=%lld atime_nsec=%lld\n" 1635 " mtime_sec=%lld mtime_nsec=%lld\n", 1636 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid, 1637 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1638 p9attr->mtime_sec, p9attr->mtime_nsec); 1639 1640 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1641 1642 if (IS_ERR(req)) { 1643 err = PTR_ERR(req); 1644 goto error; 1645 } 1646 P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1647 p9_free_req(clnt, req); 1648 error: 1649 return err; 1650 } 1651 EXPORT_SYMBOL(p9_client_setattr); 1652 1653 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1654 { 1655 int err; 1656 struct p9_req_t *req; 1657 struct p9_client *clnt; 1658 1659 err = 0; 1660 clnt = fid->clnt; 1661 1662 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1663 1664 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1665 if (IS_ERR(req)) { 1666 err = PTR_ERR(req); 1667 goto error; 1668 } 1669 1670 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1671 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1672 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1673 if (err) { 1674 P9_DUMP_PKT(1, req->rc); 1675 p9_free_req(clnt, req); 1676 goto error; 1677 } 1678 1679 P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1680 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1681 "fsid %llu namelen %ld\n", 1682 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1683 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1684 sb->fsid, (long int)sb->namelen); 1685 1686 p9_free_req(clnt, req); 1687 error: 1688 return err; 1689 } 1690 EXPORT_SYMBOL(p9_client_statfs); 1691 1692 int p9_client_rename(struct p9_fid *fid, 1693 struct p9_fid *newdirfid, const char *name) 1694 { 1695 int err; 1696 struct p9_req_t *req; 1697 struct p9_client *clnt; 1698 1699 err = 0; 1700 clnt = fid->clnt; 1701 1702 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1703 fid->fid, newdirfid->fid, name); 1704 1705 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1706 newdirfid->fid, name); 1707 if (IS_ERR(req)) { 1708 err = PTR_ERR(req); 1709 goto error; 1710 } 1711 1712 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1713 1714 p9_free_req(clnt, req); 1715 error: 1716 return err; 1717 } 1718 EXPORT_SYMBOL(p9_client_rename); 1719 1720 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1721 struct p9_fid *newdirfid, const char *new_name) 1722 { 1723 int err; 1724 struct p9_req_t *req; 1725 struct p9_client *clnt; 1726 1727 err = 0; 1728 clnt = olddirfid->clnt; 1729 1730 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" 1731 " newdirfid %d new name %s\n", olddirfid->fid, old_name, 1732 newdirfid->fid, new_name); 1733 1734 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1735 old_name, newdirfid->fid, new_name); 1736 if (IS_ERR(req)) { 1737 err = PTR_ERR(req); 1738 goto error; 1739 } 1740 1741 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1742 newdirfid->fid, new_name); 1743 1744 p9_free_req(clnt, req); 1745 error: 1746 return err; 1747 } 1748 EXPORT_SYMBOL(p9_client_renameat); 1749 1750 /* 1751 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1752 */ 1753 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1754 const char *attr_name, u64 *attr_size) 1755 { 1756 int err; 1757 struct p9_req_t *req; 1758 struct p9_client *clnt; 1759 struct p9_fid *attr_fid; 1760 1761 err = 0; 1762 clnt = file_fid->clnt; 1763 attr_fid = p9_fid_create(clnt); 1764 if (IS_ERR(attr_fid)) { 1765 err = PTR_ERR(attr_fid); 1766 attr_fid = NULL; 1767 goto error; 1768 } 1769 P9_DPRINTK(P9_DEBUG_9P, 1770 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 1771 file_fid->fid, attr_fid->fid, attr_name); 1772 1773 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 1774 file_fid->fid, attr_fid->fid, attr_name); 1775 if (IS_ERR(req)) { 1776 err = PTR_ERR(req); 1777 goto error; 1778 } 1779 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size); 1780 if (err) { 1781 P9_DUMP_PKT(1, req->rc); 1782 p9_free_req(clnt, req); 1783 goto clunk_fid; 1784 } 1785 p9_free_req(clnt, req); 1786 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 1787 attr_fid->fid, *attr_size); 1788 return attr_fid; 1789 clunk_fid: 1790 p9_client_clunk(attr_fid); 1791 attr_fid = NULL; 1792 error: 1793 if (attr_fid && (attr_fid != file_fid)) 1794 p9_fid_destroy(attr_fid); 1795 1796 return ERR_PTR(err); 1797 } 1798 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 1799 1800 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 1801 u64 attr_size, int flags) 1802 { 1803 int err; 1804 struct p9_req_t *req; 1805 struct p9_client *clnt; 1806 1807 P9_DPRINTK(P9_DEBUG_9P, 1808 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 1809 fid->fid, name, (long long)attr_size, flags); 1810 err = 0; 1811 clnt = fid->clnt; 1812 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 1813 fid->fid, name, attr_size, flags); 1814 if (IS_ERR(req)) { 1815 err = PTR_ERR(req); 1816 goto error; 1817 } 1818 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 1819 p9_free_req(clnt, req); 1820 error: 1821 return err; 1822 } 1823 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 1824 1825 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 1826 { 1827 int err, rsize; 1828 struct p9_client *clnt; 1829 struct p9_req_t *req; 1830 char *dataptr; 1831 1832 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 1833 fid->fid, (long long unsigned) offset, count); 1834 1835 err = 0; 1836 clnt = fid->clnt; 1837 1838 rsize = fid->iounit; 1839 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 1840 rsize = clnt->msize - P9_READDIRHDRSZ; 1841 1842 if (count < rsize) 1843 rsize = count; 1844 1845 if ((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) == 1846 P9_TRANS_PREF_PAYLOAD_SEP) { 1847 req = p9_client_rpc(clnt, P9_TREADDIR, "dqF", fid->fid, 1848 offset, rsize, data); 1849 } else { 1850 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 1851 offset, rsize); 1852 } 1853 if (IS_ERR(req)) { 1854 err = PTR_ERR(req); 1855 goto error; 1856 } 1857 1858 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 1859 if (err) { 1860 P9_DUMP_PKT(1, req->rc); 1861 goto free_and_error; 1862 } 1863 1864 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 1865 1866 if (!req->tc->pbuf_size && data) 1867 memmove(data, dataptr, count); 1868 1869 p9_free_req(clnt, req); 1870 return count; 1871 1872 free_and_error: 1873 p9_free_req(clnt, req); 1874 error: 1875 return err; 1876 } 1877 EXPORT_SYMBOL(p9_client_readdir); 1878 1879 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode, 1880 dev_t rdev, gid_t gid, struct p9_qid *qid) 1881 { 1882 int err; 1883 struct p9_client *clnt; 1884 struct p9_req_t *req; 1885 1886 err = 0; 1887 clnt = fid->clnt; 1888 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 1889 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 1890 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode, 1891 MAJOR(rdev), MINOR(rdev), gid); 1892 if (IS_ERR(req)) 1893 return PTR_ERR(req); 1894 1895 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1896 if (err) { 1897 P9_DUMP_PKT(1, req->rc); 1898 goto error; 1899 } 1900 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 1901 (unsigned long long)qid->path, qid->version); 1902 1903 error: 1904 p9_free_req(clnt, req); 1905 return err; 1906 1907 } 1908 EXPORT_SYMBOL(p9_client_mknod_dotl); 1909 1910 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode, 1911 gid_t gid, struct p9_qid *qid) 1912 { 1913 int err; 1914 struct p9_client *clnt; 1915 struct p9_req_t *req; 1916 1917 err = 0; 1918 clnt = fid->clnt; 1919 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 1920 fid->fid, name, mode, gid); 1921 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode, 1922 gid); 1923 if (IS_ERR(req)) 1924 return PTR_ERR(req); 1925 1926 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1927 if (err) { 1928 P9_DUMP_PKT(1, req->rc); 1929 goto error; 1930 } 1931 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 1932 (unsigned long long)qid->path, qid->version); 1933 1934 error: 1935 p9_free_req(clnt, req); 1936 return err; 1937 1938 } 1939 EXPORT_SYMBOL(p9_client_mkdir_dotl); 1940 1941 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 1942 { 1943 int err; 1944 struct p9_client *clnt; 1945 struct p9_req_t *req; 1946 1947 err = 0; 1948 clnt = fid->clnt; 1949 P9_DPRINTK(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " 1950 "start %lld length %lld proc_id %d client_id %s\n", 1951 fid->fid, flock->type, flock->flags, flock->start, 1952 flock->length, flock->proc_id, flock->client_id); 1953 1954 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 1955 flock->flags, flock->start, flock->length, 1956 flock->proc_id, flock->client_id); 1957 1958 if (IS_ERR(req)) 1959 return PTR_ERR(req); 1960 1961 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status); 1962 if (err) { 1963 P9_DUMP_PKT(1, req->rc); 1964 goto error; 1965 } 1966 P9_DPRINTK(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 1967 error: 1968 p9_free_req(clnt, req); 1969 return err; 1970 1971 } 1972 EXPORT_SYMBOL(p9_client_lock_dotl); 1973 1974 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 1975 { 1976 int err; 1977 struct p9_client *clnt; 1978 struct p9_req_t *req; 1979 1980 err = 0; 1981 clnt = fid->clnt; 1982 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " 1983 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, 1984 glock->start, glock->length, glock->proc_id, glock->client_id); 1985 1986 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, 1987 glock->start, glock->length, glock->proc_id, glock->client_id); 1988 1989 if (IS_ERR(req)) 1990 return PTR_ERR(req); 1991 1992 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type, 1993 &glock->start, &glock->length, &glock->proc_id, 1994 &glock->client_id); 1995 if (err) { 1996 P9_DUMP_PKT(1, req->rc); 1997 goto error; 1998 } 1999 P9_DPRINTK(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " 2000 "proc_id %d client_id %s\n", glock->type, glock->start, 2001 glock->length, glock->proc_id, glock->client_id); 2002 error: 2003 p9_free_req(clnt, req); 2004 return err; 2005 } 2006 EXPORT_SYMBOL(p9_client_getlock_dotl); 2007 2008 int p9_client_readlink(struct p9_fid *fid, char **target) 2009 { 2010 int err; 2011 struct p9_client *clnt; 2012 struct p9_req_t *req; 2013 2014 err = 0; 2015 clnt = fid->clnt; 2016 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2017 2018 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2019 if (IS_ERR(req)) 2020 return PTR_ERR(req); 2021 2022 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target); 2023 if (err) { 2024 P9_DUMP_PKT(1, req->rc); 2025 goto error; 2026 } 2027 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2028 error: 2029 p9_free_req(clnt, req); 2030 return err; 2031 } 2032 EXPORT_SYMBOL(p9_client_readlink); 2033