client.c revision 9f3e9bbe62b0bdbbaa7c689a68a22a7d3c1670f0
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/sched.h> 33#include <linux/uaccess.h> 34#include <net/9p/9p.h> 35#include <linux/parser.h> 36#include <net/9p/client.h> 37#include <net/9p/transport.h> 38#include "protocol.h" 39 40/* 41 * Client Option Parsing (code inspired by NFS code) 42 * - a little lazy - parse all client options 43 */ 44 45enum { 46 Opt_msize, 47 Opt_trans, 48 Opt_legacy, 49 Opt_err, 50}; 51 52static const match_table_t tokens = { 53 {Opt_msize, "msize=%u"}, 54 {Opt_legacy, "noextend"}, 55 {Opt_trans, "trans=%s"}, 56 {Opt_err, NULL}, 57}; 58 59static struct p9_req_t * 60p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 61 62/** 63 * v9fs_parse_options - parse mount options into session structure 64 * @options: options string passed from mount 65 * @v9ses: existing v9fs session information 66 * 67 * Return 0 upon success, -ERRNO upon failure 68 */ 69 70static int parse_opts(char *opts, struct p9_client *clnt) 71{ 72 char *options; 73 char *p; 74 substring_t args[MAX_OPT_ARGS]; 75 int option; 76 int ret = 0; 77 78 clnt->dotu = 1; 79 clnt->msize = 8192; 80 81 if (!opts) 82 return 0; 83 84 options = kstrdup(opts, GFP_KERNEL); 85 if (!options) { 86 P9_DPRINTK(P9_DEBUG_ERROR, 87 "failed to allocate copy of option string\n"); 88 return -ENOMEM; 89 } 90 91 while ((p = strsep(&options, ",")) != NULL) { 92 int token; 93 if (!*p) 94 continue; 95 token = match_token(p, tokens, args); 96 if (token < Opt_trans) { 97 int r = match_int(&args[0], &option); 98 if (r < 0) { 99 P9_DPRINTK(P9_DEBUG_ERROR, 100 "integer field, but no integer?\n"); 101 ret = r; 102 continue; 103 } 104 } 105 switch (token) { 106 case Opt_msize: 107 clnt->msize = option; 108 break; 109 case Opt_trans: 110 clnt->trans_mod = v9fs_get_trans_by_name(&args[0]); 111 break; 112 case Opt_legacy: 113 clnt->dotu = 0; 114 break; 115 default: 116 continue; 117 } 118 } 119 120 if (!clnt->trans_mod) 121 clnt->trans_mod = v9fs_get_default_trans(); 122 123 kfree(options); 124 return ret; 125} 126 127/** 128 * p9_tag_alloc - lookup/allocate a request by tag 129 * @c: client session to lookup tag within 130 * @tag: numeric id for transaction 131 * 132 * this is a simple array lookup, but will grow the 133 * request_slots as necessary to accomodate transaction 134 * ids which did not previously have a slot. 135 * 136 * this code relies on the client spinlock to manage locks, its 137 * possible we should switch to something else, but I'd rather 138 * stick with something low-overhead for the common case. 139 * 140 */ 141 142static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag) 143{ 144 unsigned long flags; 145 int row, col; 146 struct p9_req_t *req; 147 148 /* This looks up the original request by tag so we know which 149 * buffer to read the data into */ 150 tag++; 151 152 if (tag >= c->max_tag) { 153 spin_lock_irqsave(&c->lock, flags); 154 /* check again since original check was outside of lock */ 155 while (tag >= c->max_tag) { 156 row = (tag / P9_ROW_MAXTAG); 157 c->reqs[row] = kcalloc(P9_ROW_MAXTAG, 158 sizeof(struct p9_req_t), GFP_ATOMIC); 159 160 if (!c->reqs[row]) { 161 printk(KERN_ERR "Couldn't grow tag array\n"); 162 spin_unlock_irqrestore(&c->lock, flags); 163 return ERR_PTR(-ENOMEM); 164 } 165 for (col = 0; col < P9_ROW_MAXTAG; col++) { 166 c->reqs[row][col].status = REQ_STATUS_IDLE; 167 c->reqs[row][col].tc = NULL; 168 } 169 c->max_tag += P9_ROW_MAXTAG; 170 } 171 spin_unlock_irqrestore(&c->lock, flags); 172 } 173 row = tag / P9_ROW_MAXTAG; 174 col = tag % P9_ROW_MAXTAG; 175 176 req = &c->reqs[row][col]; 177 if (!req->tc) { 178 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL); 179 if (!req->wq) { 180 printk(KERN_ERR "Couldn't grow tag array\n"); 181 return ERR_PTR(-ENOMEM); 182 } 183 init_waitqueue_head(req->wq); 184 req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize, 185 GFP_KERNEL); 186 req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize, 187 GFP_KERNEL); 188 if ((!req->tc) || (!req->rc)) { 189 printk(KERN_ERR "Couldn't grow tag array\n"); 190 kfree(req->tc); 191 kfree(req->rc); 192 kfree(req->wq); 193 req->tc = req->rc = NULL; 194 req->wq = NULL; 195 return ERR_PTR(-ENOMEM); 196 } 197 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall); 198 req->tc->capacity = c->msize; 199 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall); 200 req->rc->capacity = c->msize; 201 } 202 203 p9pdu_reset(req->tc); 204 p9pdu_reset(req->rc); 205 206 req->flush_tag = 0; 207 req->tc->tag = tag-1; 208 req->status = REQ_STATUS_ALLOC; 209 210 return &c->reqs[row][col]; 211} 212 213/** 214 * p9_tag_lookup - lookup a request by tag 215 * @c: client session to lookup tag within 216 * @tag: numeric id for transaction 217 * 218 */ 219 220struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 221{ 222 int row, col; 223 224 /* This looks up the original request by tag so we know which 225 * buffer to read the data into */ 226 tag++; 227 228 BUG_ON(tag >= c->max_tag); 229 230 row = tag / P9_ROW_MAXTAG; 231 col = tag % P9_ROW_MAXTAG; 232 233 return &c->reqs[row][col]; 234} 235EXPORT_SYMBOL(p9_tag_lookup); 236 237/** 238 * p9_tag_init - setup tags structure and contents 239 * @tags: tags structure from the client struct 240 * 241 * This initializes the tags structure for each client instance. 242 * 243 */ 244 245static int p9_tag_init(struct p9_client *c) 246{ 247 int err = 0; 248 249 c->tagpool = p9_idpool_create(); 250 if (IS_ERR(c->tagpool)) { 251 err = PTR_ERR(c->tagpool); 252 c->tagpool = NULL; 253 goto error; 254 } 255 256 p9_idpool_get(c->tagpool); /* reserve tag 0 */ 257 258 c->max_tag = 0; 259error: 260 return err; 261} 262 263/** 264 * p9_tag_cleanup - cleans up tags structure and reclaims resources 265 * @tags: tags structure from the client struct 266 * 267 * This frees resources associated with the tags structure 268 * 269 */ 270static void p9_tag_cleanup(struct p9_client *c) 271{ 272 int row, col; 273 274 /* check to insure all requests are idle */ 275 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 276 for (col = 0; col < P9_ROW_MAXTAG; col++) { 277 if (c->reqs[row][col].status != REQ_STATUS_IDLE) { 278 P9_DPRINTK(P9_DEBUG_MUX, 279 "Attempting to cleanup non-free tag %d,%d\n", 280 row, col); 281 /* TODO: delay execution of cleanup */ 282 return; 283 } 284 } 285 } 286 287 if (c->tagpool) 288 p9_idpool_destroy(c->tagpool); 289 290 /* free requests associated with tags */ 291 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 292 for (col = 0; col < P9_ROW_MAXTAG; col++) { 293 kfree(c->reqs[row][col].wq); 294 kfree(c->reqs[row][col].tc); 295 kfree(c->reqs[row][col].rc); 296 } 297 kfree(c->reqs[row]); 298 } 299 c->max_tag = 0; 300} 301 302/** 303 * p9_free_req - free a request and clean-up as necessary 304 * c: client state 305 * r: request to release 306 * 307 */ 308 309static void p9_free_req(struct p9_client *c, struct p9_req_t *r) 310{ 311 int tag = r->tc->tag; 312 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); 313 314 r->status = REQ_STATUS_IDLE; 315 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool)) 316 p9_idpool_put(tag, c->tagpool); 317} 318 319/** 320 * p9_client_cb - call back from transport to client 321 * c: client state 322 * req: request received 323 * 324 */ 325void p9_client_cb(struct p9_client *c, struct p9_req_t *req) 326{ 327 struct p9_req_t *other_req; 328 unsigned long flags; 329 330 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag); 331 332 if (req->status == REQ_STATUS_ERROR) 333 wake_up(req->wq); 334 335 if (req->flush_tag) { /* flush receive path */ 336 P9_DPRINTK(P9_DEBUG_9P, "<<< RFLUSH %d\n", req->tc->tag); 337 spin_lock_irqsave(&c->lock, flags); 338 other_req = p9_tag_lookup(c, req->flush_tag); 339 if (other_req->status != REQ_STATUS_FLSH) /* stale flush */ 340 spin_unlock_irqrestore(&c->lock, flags); 341 else { 342 other_req->status = REQ_STATUS_FLSHD; 343 spin_unlock_irqrestore(&c->lock, flags); 344 wake_up(other_req->wq); 345 } 346 p9_free_req(c, req); 347 } else { /* normal receive path */ 348 P9_DPRINTK(P9_DEBUG_MUX, "normal: tag %d\n", req->tc->tag); 349 spin_lock_irqsave(&c->lock, flags); 350 if (req->status != REQ_STATUS_FLSHD) 351 req->status = REQ_STATUS_RCVD; 352 spin_unlock_irqrestore(&c->lock, flags); 353 wake_up(req->wq); 354 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag); 355 } 356} 357EXPORT_SYMBOL(p9_client_cb); 358 359/** 360 * p9_parse_header - parse header arguments out of a packet 361 * @pdu: packet to parse 362 * @size: size of packet 363 * @type: type of request 364 * @tag: tag of packet 365 * @rewind: set if we need to rewind offset afterwards 366 */ 367 368int 369p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, 370 int rewind) 371{ 372 int8_t r_type; 373 int16_t r_tag; 374 int32_t r_size; 375 int offset = pdu->offset; 376 int err; 377 378 pdu->offset = 0; 379 if (pdu->size == 0) 380 pdu->size = 7; 381 382 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 383 if (err) 384 goto rewind_and_exit; 385 386 pdu->size = r_size; 387 pdu->id = r_type; 388 pdu->tag = r_tag; 389 390 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size, 391 pdu->id, pdu->tag); 392 393 if (type) 394 *type = r_type; 395 if (tag) 396 *tag = r_tag; 397 if (size) 398 *size = r_size; 399 400 401rewind_and_exit: 402 if (rewind) 403 pdu->offset = offset; 404 return err; 405} 406EXPORT_SYMBOL(p9_parse_header); 407 408/** 409 * p9_check_errors - check 9p packet for error return and process it 410 * @c: current client instance 411 * @req: request to parse and check for error conditions 412 * 413 * returns error code if one is discovered, otherwise returns 0 414 * 415 * this will have to be more complicated if we have multiple 416 * error packet types 417 */ 418 419static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 420{ 421 int8_t type; 422 int err; 423 424 err = p9_parse_header(req->rc, NULL, &type, NULL, 0); 425 if (err) { 426 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 427 return err; 428 } 429 430 if (type == P9_RERROR) { 431 int ecode; 432 char *ename; 433 434 err = p9pdu_readf(req->rc, c->dotu, "s?d", &ename, &ecode); 435 if (err) { 436 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", 437 err); 438 return err; 439 } 440 441 if (c->dotu) 442 err = -ecode; 443 444 if (!err) { 445 err = p9_errstr2errno(ename, strlen(ename)); 446 447 /* string match failed */ 448 if (!err) 449 err = -ESERVERFAULT; 450 } 451 452 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename); 453 454 kfree(ename); 455 } else 456 err = 0; 457 458 return err; 459} 460 461/** 462 * p9_client_flush - flush (cancel) a request 463 * c: client state 464 * req: request to cancel 465 * 466 * This sents a flush for a particular requests and links 467 * the flush request to the original request. The current 468 * code only supports a single flush request although the protocol 469 * allows for multiple flush requests to be sent for a single request. 470 * 471 */ 472 473static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 474{ 475 struct p9_req_t *req; 476 int16_t oldtag; 477 int err; 478 479 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); 480 if (err) 481 return err; 482 483 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 484 485 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 486 if (IS_ERR(req)) 487 return PTR_ERR(req); 488 489 req->flush_tag = oldtag; 490 491 /* we don't free anything here because RPC isn't complete */ 492 return 0; 493} 494 495/** 496 * p9_client_rpc - issue a request and wait for a response 497 * @c: client session 498 * @type: type of request 499 * @fmt: protocol format string (see protocol.c) 500 * 501 * Returns request structure (which client must free using p9_free_req) 502 */ 503 504static struct p9_req_t * 505p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 506{ 507 va_list ap; 508 int tag, err; 509 struct p9_req_t *req; 510 unsigned long flags; 511 int sigpending; 512 int flushed = 0; 513 514 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type); 515 516 if (c->status != Connected) 517 return ERR_PTR(-EIO); 518 519 if (signal_pending(current)) { 520 sigpending = 1; 521 clear_thread_flag(TIF_SIGPENDING); 522 } else 523 sigpending = 0; 524 525 tag = P9_NOTAG; 526 if (type != P9_TVERSION) { 527 tag = p9_idpool_get(c->tagpool); 528 if (tag < 0) 529 return ERR_PTR(-ENOMEM); 530 } 531 532 req = p9_tag_alloc(c, tag); 533 if (IS_ERR(req)) 534 return req; 535 536 /* marshall the data */ 537 p9pdu_prepare(req->tc, tag, type); 538 va_start(ap, fmt); 539 err = p9pdu_vwritef(req->tc, c->dotu, fmt, ap); 540 va_end(ap); 541 p9pdu_finalize(req->tc); 542 543 err = c->trans_mod->request(c, req); 544 if (err < 0) { 545 c->status = Disconnected; 546 goto reterr; 547 } 548 549 /* if it was a flush we just transmitted, return our tag */ 550 if (type == P9_TFLUSH) 551 return req; 552again: 553 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag); 554 err = wait_event_interruptible(*req->wq, 555 req->status >= REQ_STATUS_RCVD); 556 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d (flushed=%d)\n", 557 req->wq, tag, err, flushed); 558 559 if (req->status == REQ_STATUS_ERROR) { 560 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 561 err = req->t_err; 562 } else if (err == -ERESTARTSYS && flushed) { 563 P9_DPRINTK(P9_DEBUG_MUX, "flushed - going again\n"); 564 goto again; 565 } else if (req->status == REQ_STATUS_FLSHD) { 566 P9_DPRINTK(P9_DEBUG_MUX, "flushed - erestartsys\n"); 567 err = -ERESTARTSYS; 568 } 569 570 if ((err == -ERESTARTSYS) && (c->status == Connected) && (!flushed)) { 571 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n"); 572 spin_lock_irqsave(&c->lock, flags); 573 if (req->status == REQ_STATUS_SENT) 574 req->status = REQ_STATUS_FLSH; 575 spin_unlock_irqrestore(&c->lock, flags); 576 sigpending = 1; 577 flushed = 1; 578 clear_thread_flag(TIF_SIGPENDING); 579 580 if (c->trans_mod->cancel(c, req)) { 581 err = p9_client_flush(c, req); 582 if (err == 0) 583 goto again; 584 } 585 } 586 587 if (sigpending) { 588 spin_lock_irqsave(¤t->sighand->siglock, flags); 589 recalc_sigpending(); 590 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 591 } 592 593 if (err < 0) 594 goto reterr; 595 596 err = p9_check_errors(c, req); 597 if (!err) { 598 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type); 599 return req; 600 } 601 602reterr: 603 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type, 604 err); 605 p9_free_req(c, req); 606 return ERR_PTR(err); 607} 608 609static struct p9_fid *p9_fid_create(struct p9_client *clnt) 610{ 611 int ret; 612 struct p9_fid *fid; 613 unsigned long flags; 614 615 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt); 616 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 617 if (!fid) 618 return ERR_PTR(-ENOMEM); 619 620 ret = p9_idpool_get(clnt->fidpool); 621 if (fid->fid < 0) { 622 ret = -ENOSPC; 623 goto error; 624 } 625 fid->fid = ret; 626 627 memset(&fid->qid, 0, sizeof(struct p9_qid)); 628 fid->mode = -1; 629 fid->rdir_fpos = 0; 630 fid->uid = current->fsuid; 631 fid->clnt = clnt; 632 fid->aux = NULL; 633 634 spin_lock_irqsave(&clnt->lock, flags); 635 list_add(&fid->flist, &clnt->fidlist); 636 spin_unlock_irqrestore(&clnt->lock, flags); 637 638 return fid; 639 640error: 641 kfree(fid); 642 return ERR_PTR(ret); 643} 644 645static void p9_fid_destroy(struct p9_fid *fid) 646{ 647 struct p9_client *clnt; 648 unsigned long flags; 649 650 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid); 651 clnt = fid->clnt; 652 p9_idpool_put(fid->fid, clnt->fidpool); 653 spin_lock_irqsave(&clnt->lock, flags); 654 list_del(&fid->flist); 655 spin_unlock_irqrestore(&clnt->lock, flags); 656 kfree(fid); 657} 658 659int p9_client_version(struct p9_client *c) 660{ 661 int err = 0; 662 struct p9_req_t *req; 663 char *version; 664 int msize; 665 666 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d extended %d\n", 667 c->msize, c->dotu); 668 req = p9_client_rpc(c, P9_TVERSION, "ds", c->msize, 669 c->dotu ? "9P2000.u" : "9P2000"); 670 if (IS_ERR(req)) 671 return PTR_ERR(req); 672 673 err = p9pdu_readf(req->rc, c->dotu, "ds", &msize, &version); 674 if (err) { 675 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err); 676 p9pdu_dump(1, req->rc); 677 goto error; 678 } 679 680 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 681 if (!memcmp(version, "9P2000.u", 8)) 682 c->dotu = 1; 683 else if (!memcmp(version, "9P2000", 6)) 684 c->dotu = 0; 685 else { 686 err = -EREMOTEIO; 687 goto error; 688 } 689 690 if (msize < c->msize) 691 c->msize = msize; 692 693error: 694 kfree(version); 695 p9_free_req(c, req); 696 697 return err; 698} 699EXPORT_SYMBOL(p9_client_version); 700 701struct p9_client *p9_client_create(const char *dev_name, char *options) 702{ 703 int err; 704 struct p9_client *clnt; 705 706 err = 0; 707 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 708 if (!clnt) 709 return ERR_PTR(-ENOMEM); 710 711 clnt->trans_mod = NULL; 712 clnt->trans = NULL; 713 spin_lock_init(&clnt->lock); 714 INIT_LIST_HEAD(&clnt->fidlist); 715 clnt->fidpool = p9_idpool_create(); 716 if (IS_ERR(clnt->fidpool)) { 717 err = PTR_ERR(clnt->fidpool); 718 clnt->fidpool = NULL; 719 goto error; 720 } 721 722 p9_tag_init(clnt); 723 724 err = parse_opts(options, clnt); 725 if (err < 0) 726 goto error; 727 728 if (clnt->trans_mod == NULL) { 729 err = -EPROTONOSUPPORT; 730 P9_DPRINTK(P9_DEBUG_ERROR, 731 "No transport defined or default transport\n"); 732 goto error; 733 } 734 735 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d dotu %d\n", 736 clnt, clnt->trans_mod, clnt->msize, clnt->dotu); 737 738 err = clnt->trans_mod->create(clnt, dev_name, options); 739 if (err) 740 goto error; 741 742 if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize) 743 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ; 744 745 err = p9_client_version(clnt); 746 if (err) 747 goto error; 748 749 return clnt; 750 751error: 752 p9_client_destroy(clnt); 753 return ERR_PTR(err); 754} 755EXPORT_SYMBOL(p9_client_create); 756 757void p9_client_destroy(struct p9_client *clnt) 758{ 759 struct p9_fid *fid, *fidptr; 760 761 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt); 762 763 if (clnt->trans_mod) 764 clnt->trans_mod->close(clnt); 765 766 v9fs_put_trans(clnt->trans_mod); 767 768 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) 769 p9_fid_destroy(fid); 770 771 if (clnt->fidpool) 772 p9_idpool_destroy(clnt->fidpool); 773 774 p9_tag_cleanup(clnt); 775 776 kfree(clnt); 777} 778EXPORT_SYMBOL(p9_client_destroy); 779 780void p9_client_disconnect(struct p9_client *clnt) 781{ 782 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); 783 clnt->status = Disconnected; 784} 785EXPORT_SYMBOL(p9_client_disconnect); 786 787struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 788 char *uname, u32 n_uname, char *aname) 789{ 790 int err; 791 struct p9_req_t *req; 792 struct p9_fid *fid; 793 struct p9_qid qid; 794 795 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 796 afid ? afid->fid : -1, uname, aname); 797 err = 0; 798 799 fid = p9_fid_create(clnt); 800 if (IS_ERR(fid)) { 801 err = PTR_ERR(fid); 802 fid = NULL; 803 goto error; 804 } 805 806 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid, 807 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 808 if (IS_ERR(req)) { 809 err = PTR_ERR(req); 810 goto error; 811 } 812 813 err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid); 814 if (err) { 815 p9pdu_dump(1, req->rc); 816 p9_free_req(clnt, req); 817 goto error; 818 } 819 820 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 821 qid.type, qid.path, qid.version); 822 823 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 824 825 p9_free_req(clnt, req); 826 return fid; 827 828error: 829 if (fid) 830 p9_fid_destroy(fid); 831 return ERR_PTR(err); 832} 833EXPORT_SYMBOL(p9_client_attach); 834 835struct p9_fid * 836p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname) 837{ 838 int err; 839 struct p9_req_t *req; 840 struct p9_qid qid; 841 struct p9_fid *afid; 842 843 P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname); 844 err = 0; 845 846 afid = p9_fid_create(clnt); 847 if (IS_ERR(afid)) { 848 err = PTR_ERR(afid); 849 afid = NULL; 850 goto error; 851 } 852 853 req = p9_client_rpc(clnt, P9_TAUTH, "dss?d", 854 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 855 if (IS_ERR(req)) { 856 err = PTR_ERR(req); 857 goto error; 858 } 859 860 err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid); 861 if (err) { 862 p9pdu_dump(1, req->rc); 863 p9_free_req(clnt, req); 864 goto error; 865 } 866 867 P9_DPRINTK(P9_DEBUG_9P, "<<< RAUTH qid %x.%llx.%x\n", 868 qid.type, qid.path, qid.version); 869 870 memmove(&afid->qid, &qid, sizeof(struct p9_qid)); 871 p9_free_req(clnt, req); 872 return afid; 873 874error: 875 if (afid) 876 p9_fid_destroy(afid); 877 return ERR_PTR(err); 878} 879EXPORT_SYMBOL(p9_client_auth); 880 881struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames, 882 int clone) 883{ 884 int err; 885 struct p9_client *clnt; 886 struct p9_fid *fid; 887 struct p9_qid *wqids; 888 struct p9_req_t *req; 889 int16_t nwqids, count; 890 891 err = 0; 892 clnt = oldfid->clnt; 893 if (clone) { 894 fid = p9_fid_create(clnt); 895 if (IS_ERR(fid)) { 896 err = PTR_ERR(fid); 897 fid = NULL; 898 goto error; 899 } 900 901 fid->uid = oldfid->uid; 902 } else 903 fid = oldfid; 904 905 906 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n", 907 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 908 909 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 910 nwname, wnames); 911 if (IS_ERR(req)) { 912 err = PTR_ERR(req); 913 goto error; 914 } 915 916 err = p9pdu_readf(req->rc, clnt->dotu, "R", &nwqids, &wqids); 917 if (err) { 918 p9pdu_dump(1, req->rc); 919 p9_free_req(clnt, req); 920 goto clunk_fid; 921 } 922 p9_free_req(clnt, req); 923 924 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 925 926 if (nwqids != nwname) { 927 err = -ENOENT; 928 goto clunk_fid; 929 } 930 931 for (count = 0; count < nwqids; count++) 932 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 933 count, wqids[count].type, wqids[count].path, 934 wqids[count].version); 935 936 if (nwname) 937 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 938 else 939 fid->qid = oldfid->qid; 940 941 return fid; 942 943clunk_fid: 944 p9_client_clunk(fid); 945 fid = NULL; 946 947error: 948 if (fid && (fid != oldfid)) 949 p9_fid_destroy(fid); 950 951 return ERR_PTR(err); 952} 953EXPORT_SYMBOL(p9_client_walk); 954 955int p9_client_open(struct p9_fid *fid, int mode) 956{ 957 int err; 958 struct p9_client *clnt; 959 struct p9_req_t *req; 960 struct p9_qid qid; 961 int iounit; 962 963 P9_DPRINTK(P9_DEBUG_9P, ">>> TOPEN fid %d mode %d\n", fid->fid, mode); 964 err = 0; 965 clnt = fid->clnt; 966 967 if (fid->mode != -1) 968 return -EINVAL; 969 970 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 971 if (IS_ERR(req)) { 972 err = PTR_ERR(req); 973 goto error; 974 } 975 976 err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit); 977 if (err) { 978 p9pdu_dump(1, req->rc); 979 goto free_and_error; 980 } 981 982 P9_DPRINTK(P9_DEBUG_9P, "<<< ROPEN qid %x.%llx.%x iounit %x\n", 983 qid.type, qid.path, qid.version, iounit); 984 985 fid->mode = mode; 986 fid->iounit = iounit; 987 988free_and_error: 989 p9_free_req(clnt, req); 990error: 991 return err; 992} 993EXPORT_SYMBOL(p9_client_open); 994 995int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, 996 char *extension) 997{ 998 int err; 999 struct p9_client *clnt; 1000 struct p9_req_t *req; 1001 struct p9_qid qid; 1002 int iounit; 1003 1004 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1005 fid->fid, name, perm, mode); 1006 err = 0; 1007 clnt = fid->clnt; 1008 1009 if (fid->mode != -1) 1010 return -EINVAL; 1011 1012 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1013 mode, extension); 1014 if (IS_ERR(req)) { 1015 err = PTR_ERR(req); 1016 goto error; 1017 } 1018 1019 err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit); 1020 if (err) { 1021 p9pdu_dump(1, req->rc); 1022 goto free_and_error; 1023 } 1024 1025 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1026 qid.type, qid.path, qid.version, iounit); 1027 1028 fid->mode = mode; 1029 fid->iounit = iounit; 1030 1031free_and_error: 1032 p9_free_req(clnt, req); 1033error: 1034 return err; 1035} 1036EXPORT_SYMBOL(p9_client_fcreate); 1037 1038int p9_client_clunk(struct p9_fid *fid) 1039{ 1040 int err; 1041 struct p9_client *clnt; 1042 struct p9_req_t *req; 1043 1044 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid); 1045 err = 0; 1046 clnt = fid->clnt; 1047 1048 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1049 if (IS_ERR(req)) { 1050 err = PTR_ERR(req); 1051 goto error; 1052 } 1053 1054 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1055 1056 p9_free_req(clnt, req); 1057 p9_fid_destroy(fid); 1058 1059error: 1060 return err; 1061} 1062EXPORT_SYMBOL(p9_client_clunk); 1063 1064int p9_client_remove(struct p9_fid *fid) 1065{ 1066 int err; 1067 struct p9_client *clnt; 1068 struct p9_req_t *req; 1069 1070 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1071 err = 0; 1072 clnt = fid->clnt; 1073 1074 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1075 if (IS_ERR(req)) { 1076 err = PTR_ERR(req); 1077 goto error; 1078 } 1079 1080 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1081 1082 p9_free_req(clnt, req); 1083 p9_fid_destroy(fid); 1084 1085error: 1086 return err; 1087} 1088EXPORT_SYMBOL(p9_client_remove); 1089 1090int 1091p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, 1092 u32 count) 1093{ 1094 int err, rsize, total; 1095 struct p9_client *clnt; 1096 struct p9_req_t *req; 1097 char *dataptr; 1098 1099 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid, 1100 (long long unsigned) offset, count); 1101 err = 0; 1102 clnt = fid->clnt; 1103 total = 0; 1104 1105 rsize = fid->iounit; 1106 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1107 rsize = clnt->msize - P9_IOHDRSZ; 1108 1109 if (count < rsize) 1110 rsize = count; 1111 1112 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize); 1113 if (IS_ERR(req)) { 1114 err = PTR_ERR(req); 1115 goto error; 1116 } 1117 1118 err = p9pdu_readf(req->rc, clnt->dotu, "D", &count, &dataptr); 1119 if (err) { 1120 p9pdu_dump(1, req->rc); 1121 goto free_and_error; 1122 } 1123 1124 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1125 1126 if (data) { 1127 memmove(data, dataptr, count); 1128 data += count; 1129 } 1130 1131 if (udata) { 1132 err = copy_to_user(udata, dataptr, count); 1133 if (err) { 1134 err = -EFAULT; 1135 goto free_and_error; 1136 } 1137 } 1138 1139 p9_free_req(clnt, req); 1140 return count; 1141 1142free_and_error: 1143 p9_free_req(clnt, req); 1144error: 1145 return err; 1146} 1147EXPORT_SYMBOL(p9_client_read); 1148 1149int 1150p9_client_write(struct p9_fid *fid, char *data, const char __user *udata, 1151 u64 offset, u32 count) 1152{ 1153 int err, rsize, total; 1154 struct p9_client *clnt; 1155 struct p9_req_t *req; 1156 1157 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n", 1158 fid->fid, (long long unsigned) offset, count); 1159 err = 0; 1160 clnt = fid->clnt; 1161 total = 0; 1162 1163 rsize = fid->iounit; 1164 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1165 rsize = clnt->msize - P9_IOHDRSZ; 1166 1167 if (count < rsize) 1168 rsize = count; 1169 if (data) 1170 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset, 1171 rsize, data); 1172 else 1173 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset, 1174 rsize, udata); 1175 if (IS_ERR(req)) { 1176 err = PTR_ERR(req); 1177 goto error; 1178 } 1179 1180 err = p9pdu_readf(req->rc, clnt->dotu, "d", &count); 1181 if (err) { 1182 p9pdu_dump(1, req->rc); 1183 goto free_and_error; 1184 } 1185 1186 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1187 1188 p9_free_req(clnt, req); 1189 return count; 1190 1191free_and_error: 1192 p9_free_req(clnt, req); 1193error: 1194 return err; 1195} 1196EXPORT_SYMBOL(p9_client_write); 1197 1198struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1199{ 1200 int err; 1201 struct p9_client *clnt; 1202 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1203 struct p9_req_t *req; 1204 u16 ignored; 1205 1206 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1207 1208 if (!ret) 1209 return ERR_PTR(-ENOMEM); 1210 1211 err = 0; 1212 clnt = fid->clnt; 1213 1214 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1215 if (IS_ERR(req)) { 1216 err = PTR_ERR(req); 1217 goto error; 1218 } 1219 1220 err = p9pdu_readf(req->rc, clnt->dotu, "wS", &ignored, ret); 1221 if (err) { 1222 ret = ERR_PTR(err); 1223 p9pdu_dump(1, req->rc); 1224 goto free_and_error; 1225 } 1226 1227 P9_DPRINTK(P9_DEBUG_9P, 1228 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1229 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1230 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1231 "<<< uid=%d gid=%d n_muid=%d\n", 1232 ret->size, ret->type, ret->dev, ret->qid.type, 1233 ret->qid.path, ret->qid.version, ret->mode, 1234 ret->atime, ret->mtime, ret->length, ret->name, 1235 ret->uid, ret->gid, ret->muid, ret->extension, 1236 ret->n_uid, ret->n_gid, ret->n_muid); 1237 1238free_and_error: 1239 p9_free_req(clnt, req); 1240error: 1241 return ret; 1242} 1243EXPORT_SYMBOL(p9_client_stat); 1244 1245int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1246{ 1247 int err; 1248 struct p9_req_t *req; 1249 struct p9_client *clnt; 1250 1251 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1252 P9_DPRINTK(P9_DEBUG_9P, 1253 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1254 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1255 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1256 " uid=%d gid=%d n_muid=%d\n", 1257 wst->size, wst->type, wst->dev, wst->qid.type, 1258 wst->qid.path, wst->qid.version, wst->mode, 1259 wst->atime, wst->mtime, wst->length, wst->name, 1260 wst->uid, wst->gid, wst->muid, wst->extension, 1261 wst->n_uid, wst->n_gid, wst->n_muid); 1262 err = 0; 1263 clnt = fid->clnt; 1264 1265 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, 0, wst); 1266 if (IS_ERR(req)) { 1267 err = PTR_ERR(req); 1268 goto error; 1269 } 1270 1271 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1272 1273 p9_free_req(clnt, req); 1274error: 1275 return err; 1276} 1277EXPORT_SYMBOL(p9_client_wstat); 1278