1 /* 2 * linux/fs/9p/trans_fd.c 3 * 4 * Fd transport layer. Includes deprecated socket layer. 5 * 6 * Copyright (C) 2006 by Russ Cox <rsc@swtch.com> 7 * Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net> 8 * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com> 9 * Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com> 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License version 2 13 * as published by the Free Software Foundation. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to: 22 * Free Software Foundation 23 * 51 Franklin Street, Fifth Floor 24 * Boston, MA 02111-1301 USA 25 * 26 */ 27 28 #include <linux/in.h> 29 #include <linux/module.h> 30 #include <linux/net.h> 31 #include <linux/ipv6.h> 32 #include <linux/kthread.h> 33 #include <linux/errno.h> 34 #include <linux/kernel.h> 35 #include <linux/un.h> 36 #include <linux/uaccess.h> 37 #include <linux/inet.h> 38 #include <linux/idr.h> 39 #include <linux/file.h> 40 #include <linux/parser.h> 41 #include <net/9p/9p.h> 42 #include <net/9p/transport.h> 43 44 #define P9_PORT 564 45 #define MAX_SOCK_BUF (64*1024) 46 #define ERREQFLUSH 1 47 #define SCHED_TIMEOUT 10 48 #define MAXPOLLWADDR 2 49 50 /** 51 * struct p9_fd_opts - per-transport options 52 * @rfd: file descriptor for reading (trans=fd) 53 * @wfd: file descriptor for writing (trans=fd) 54 * @port: port to connect to (trans=tcp) 55 * 56 */ 57 58 struct p9_fd_opts { 59 int rfd; 60 int wfd; 61 u16 port; 62 }; 63 64 65 /** 66 * struct p9_trans_fd - transport state 67 * @rd: reference to file to read from 68 * @wr: reference of file to write to 69 * @conn: connection state reference 70 * 71 */ 72 73 struct p9_trans_fd { 74 struct file *rd; 75 struct file *wr; 76 struct p9_conn *conn; 77 }; 78 79 /* 80 * Option Parsing (code inspired by NFS code) 81 * - a little lazy - parse all fd-transport options 82 */ 83 84 enum { 85 /* Options that take integer arguments */ 86 Opt_port, Opt_rfdno, Opt_wfdno, Opt_err, 87 }; 88 89 static match_table_t tokens = { 90 {Opt_port, "port=%u"}, 91 {Opt_rfdno, "rfdno=%u"}, 92 {Opt_wfdno, "wfdno=%u"}, 93 {Opt_err, NULL}, 94 }; 95 96 enum { 97 Rworksched = 1, /* read work scheduled or running */ 98 Rpending = 2, /* can read */ 99 Wworksched = 4, /* write work scheduled or running */ 100 Wpending = 8, /* can write */ 101 }; 102 103 enum { 104 None, 105 Flushing, 106 Flushed, 107 }; 108 109 struct p9_req; 110 typedef void (*p9_conn_req_callback)(struct p9_req *req, void *a); 111 112 /** 113 * struct p9_req - fd mux encoding of an rpc transaction 114 * @lock: protects req_list 115 * @tag: numeric tag for rpc transaction 116 * @tcall: request &p9_fcall structure 117 * @rcall: response &p9_fcall structure 118 * @err: error state 119 * @cb: callback for when response is received 120 * @cba: argument to pass to callback 121 * @flush: flag to indicate RPC has been flushed 122 * @req_list: list link for higher level objects to chain requests 123 * 124 */ 125 126 struct p9_req { 127 spinlock_t lock; 128 int tag; 129 struct p9_fcall *tcall; 130 struct p9_fcall *rcall; 131 int err; 132 p9_conn_req_callback cb; 133 void *cba; 134 int flush; 135 struct list_head req_list; 136 }; 137 138 struct p9_mux_poll_task { 139 struct task_struct *task; 140 struct list_head mux_list; 141 int muxnum; 142 }; 143 144 /** 145 * struct p9_conn - fd mux connection state information 146 * @lock: protects mux_list (?) 147 * @mux_list: list link for mux to manage multiple connections (?) 148 * @poll_task: task polling on this connection 149 * @msize: maximum size for connection (dup) 150 * @extended: 9p2000.u flag (dup) 151 * @trans: reference to transport instance for this connection 152 * @tagpool: id accounting for transactions 153 * @err: error state 154 * @equeue: event wait_q (?) 155 * @req_list: accounting for requests which have been sent 156 * @unsent_req_list: accounting for requests that haven't been sent 157 * @rcall: current response &p9_fcall structure 158 * @rpos: read position in current frame 159 * @rbuf: current read buffer 160 * @wpos: write position for current frame 161 * @wsize: amount of data to write for current frame 162 * @wbuf: current write buffer 163 * @poll_wait: array of wait_q's for various worker threads 164 * @poll_waddr: ???? 165 * @pt: poll state 166 * @rq: current read work 167 * @wq: current write work 168 * @wsched: ???? 169 * 170 */ 171 172 struct p9_conn { 173 spinlock_t lock; /* protect lock structure */ 174 struct list_head mux_list; 175 struct p9_mux_poll_task *poll_task; 176 int msize; 177 unsigned char extended; 178 struct p9_trans *trans; 179 struct p9_idpool *tagpool; 180 int err; 181 wait_queue_head_t equeue; 182 struct list_head req_list; 183 struct list_head unsent_req_list; 184 struct p9_fcall *rcall; 185 int rpos; 186 char *rbuf; 187 int wpos; 188 int wsize; 189 char *wbuf; 190 wait_queue_t poll_wait[MAXPOLLWADDR]; 191 wait_queue_head_t *poll_waddr[MAXPOLLWADDR]; 192 poll_table pt; 193 struct work_struct rq; 194 struct work_struct wq; 195 unsigned long wsched; 196 }; 197 198 /** 199 * struct p9_mux_rpc - fd mux rpc accounting structure 200 * @m: connection this request was issued on 201 * @err: error state 202 * @tcall: request &p9_fcall 203 * @rcall: response &p9_fcall 204 * @wqueue: wait queue that client is blocked on for this rpc 205 * 206 * Bug: isn't this information duplicated elsewhere like &p9_req 207 */ 208 209 struct p9_mux_rpc { 210 struct p9_conn *m; 211 int err; 212 struct p9_fcall *tcall; 213 struct p9_fcall *rcall; 214 wait_queue_head_t wqueue; 215 }; 216 217 static int p9_poll_proc(void *); 218 static void p9_read_work(struct work_struct *work); 219 static void p9_write_work(struct work_struct *work); 220 static void p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, 221 poll_table *p); 222 static int p9_fd_write(struct p9_trans *trans, void *v, int len); 223 static int p9_fd_read(struct p9_trans *trans, void *v, int len); 224 225 static DEFINE_MUTEX(p9_mux_task_lock); 226 static struct workqueue_struct *p9_mux_wq; 227 228 static int p9_mux_num; 229 static int p9_mux_poll_task_num; 230 static struct p9_mux_poll_task p9_mux_poll_tasks[100]; 231 232 static void p9_conn_destroy(struct p9_conn *); 233 static unsigned int p9_fd_poll(struct p9_trans *trans, 234 struct poll_table_struct *pt); 235 236 #ifdef P9_NONBLOCK 237 static int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc, 238 p9_conn_req_callback cb, void *a); 239 #endif /* P9_NONBLOCK */ 240 241 static void p9_conn_cancel(struct p9_conn *m, int err); 242 243 static int p9_mux_global_init(void) 244 { 245 int i; 246 247 for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++) 248 p9_mux_poll_tasks[i].task = NULL; 249 250 p9_mux_wq = create_workqueue("v9fs"); 251 if (!p9_mux_wq) { 252 printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n"); 253 return -ENOMEM; 254 } 255 256 return 0; 257 } 258 259 static u16 p9_mux_get_tag(struct p9_conn *m) 260 { 261 int tag; 262 263 tag = p9_idpool_get(m->tagpool); 264 if (tag < 0) 265 return P9_NOTAG; 266 else 267 return (u16) tag; 268 } 269 270 static void p9_mux_put_tag(struct p9_conn *m, u16 tag) 271 { 272 if (tag != P9_NOTAG && p9_idpool_check(tag, m->tagpool)) 273 p9_idpool_put(tag, m->tagpool); 274 } 275 276 /** 277 * p9_mux_calc_poll_procs - calculates the number of polling procs 278 * @muxnum: number of mounts 279 * 280 * Calculation is based on the number of mounted v9fs filesystems. 281 * The current implementation returns sqrt of the number of mounts. 282 */ 283 284 static int p9_mux_calc_poll_procs(int muxnum) 285 { 286 int n; 287 288 if (p9_mux_poll_task_num) 289 n = muxnum / p9_mux_poll_task_num + 290 (muxnum % p9_mux_poll_task_num ? 1 : 0); 291 else 292 n = 1; 293 294 if (n > ARRAY_SIZE(p9_mux_poll_tasks)) 295 n = ARRAY_SIZE(p9_mux_poll_tasks); 296 297 return n; 298 } 299 300 static int p9_mux_poll_start(struct p9_conn *m) 301 { 302 int i, n; 303 struct p9_mux_poll_task *vpt, *vptlast; 304 struct task_struct *pproc; 305 306 P9_DPRINTK(P9_DEBUG_MUX, "mux %p muxnum %d procnum %d\n", m, p9_mux_num, 307 p9_mux_poll_task_num); 308 mutex_lock(&p9_mux_task_lock); 309 310 n = p9_mux_calc_poll_procs(p9_mux_num + 1); 311 if (n > p9_mux_poll_task_num) { 312 for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++) { 313 if (p9_mux_poll_tasks[i].task == NULL) { 314 vpt = &p9_mux_poll_tasks[i]; 315 P9_DPRINTK(P9_DEBUG_MUX, "create proc %p\n", 316 vpt); 317 pproc = kthread_create(p9_poll_proc, vpt, 318 "v9fs-poll"); 319 320 if (!IS_ERR(pproc)) { 321 vpt->task = pproc; 322 INIT_LIST_HEAD(&vpt->mux_list); 323 vpt->muxnum = 0; 324 p9_mux_poll_task_num++; 325 wake_up_process(vpt->task); 326 } 327 break; 328 } 329 } 330 331 if (i >= ARRAY_SIZE(p9_mux_poll_tasks)) 332 P9_DPRINTK(P9_DEBUG_ERROR, 333 "warning: no free poll slots\n"); 334 } 335 336 n = (p9_mux_num + 1) / p9_mux_poll_task_num + 337 ((p9_mux_num + 1) % p9_mux_poll_task_num ? 1 : 0); 338 339 vptlast = NULL; 340 for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++) { 341 vpt = &p9_mux_poll_tasks[i]; 342 if (vpt->task != NULL) { 343 vptlast = vpt; 344 if (vpt->muxnum < n) { 345 P9_DPRINTK(P9_DEBUG_MUX, "put in proc %d\n", i); 346 list_add(&m->mux_list, &vpt->mux_list); 347 vpt->muxnum++; 348 m->poll_task = vpt; 349 memset(&m->poll_waddr, 0, 350 sizeof(m->poll_waddr)); 351 init_poll_funcptr(&m->pt, p9_pollwait); 352 break; 353 } 354 } 355 } 356 357 if (i >= ARRAY_SIZE(p9_mux_poll_tasks)) { 358 if (vptlast == NULL) { 359 mutex_unlock(&p9_mux_task_lock); 360 return -ENOMEM; 361 } 362 363 P9_DPRINTK(P9_DEBUG_MUX, "put in proc %d\n", i); 364 list_add(&m->mux_list, &vptlast->mux_list); 365 vptlast->muxnum++; 366 m->poll_task = vptlast; 367 memset(&m->poll_waddr, 0, sizeof(m->poll_waddr)); 368 init_poll_funcptr(&m->pt, p9_pollwait); 369 } 370 371 p9_mux_num++; 372 mutex_unlock(&p9_mux_task_lock); 373 374 return 0; 375 } 376 377 static void p9_mux_poll_stop(struct p9_conn *m) 378 { 379 int i; 380 struct p9_mux_poll_task *vpt; 381 382 mutex_lock(&p9_mux_task_lock); 383 vpt = m->poll_task; 384 list_del(&m->mux_list); 385 for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) { 386 if (m->poll_waddr[i] != NULL) { 387 remove_wait_queue(m->poll_waddr[i], &m->poll_wait[i]); 388 m->poll_waddr[i] = NULL; 389 } 390 } 391 vpt->muxnum--; 392 if (!vpt->muxnum) { 393 P9_DPRINTK(P9_DEBUG_MUX, "destroy proc %p\n", vpt); 394 kthread_stop(vpt->task); 395 vpt->task = NULL; 396 p9_mux_poll_task_num--; 397 } 398 p9_mux_num--; 399 mutex_unlock(&p9_mux_task_lock); 400 } 401 402 /** 403 * p9_conn_create - allocate and initialize the per-session mux data 404 * @trans: transport structure 405 * 406 * Note: Creates the polling task if this is the first session. 407 */ 408 409 static struct p9_conn *p9_conn_create(struct p9_trans *trans) 410 { 411 int i, n; 412 struct p9_conn *m, *mtmp; 413 414 P9_DPRINTK(P9_DEBUG_MUX, "transport %p msize %d\n", trans, 415 trans->msize); 416 m = kmalloc(sizeof(struct p9_conn), GFP_KERNEL); 417 if (!m) 418 return ERR_PTR(-ENOMEM); 419 420 spin_lock_init(&m->lock); 421 INIT_LIST_HEAD(&m->mux_list); 422 m->msize = trans->msize; 423 m->extended = trans->extended; 424 m->trans = trans; 425 m->tagpool = p9_idpool_create(); 426 if (IS_ERR(m->tagpool)) { 427 mtmp = ERR_PTR(-ENOMEM); 428 kfree(m); 429 return mtmp; 430 } 431 432 m->err = 0; 433 init_waitqueue_head(&m->equeue); 434 INIT_LIST_HEAD(&m->req_list); 435 INIT_LIST_HEAD(&m->unsent_req_list); 436 m->rcall = NULL; 437 m->rpos = 0; 438 m->rbuf = NULL; 439 m->wpos = m->wsize = 0; 440 m->wbuf = NULL; 441 INIT_WORK(&m->rq, p9_read_work); 442 INIT_WORK(&m->wq, p9_write_work); 443 m->wsched = 0; 444 memset(&m->poll_waddr, 0, sizeof(m->poll_waddr)); 445 m->poll_task = NULL; 446 n = p9_mux_poll_start(m); 447 if (n) { 448 kfree(m); 449 return ERR_PTR(n); 450 } 451 452 n = p9_fd_poll(trans, &m->pt); 453 if (n & POLLIN) { 454 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m); 455 set_bit(Rpending, &m->wsched); 456 } 457 458 if (n & POLLOUT) { 459 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m); 460 set_bit(Wpending, &m->wsched); 461 } 462 463 for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) { 464 if (IS_ERR(m->poll_waddr[i])) { 465 p9_mux_poll_stop(m); 466 mtmp = (void *)m->poll_waddr; /* the error code */ 467 kfree(m); 468 m = mtmp; 469 break; 470 } 471 } 472 473 return m; 474 } 475 476 /** 477 * p9_mux_destroy - cancels all pending requests and frees mux resources 478 * @m: mux to destroy 479 * 480 */ 481 482 static void p9_conn_destroy(struct p9_conn *m) 483 { 484 P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m, 485 m->mux_list.prev, m->mux_list.next); 486 p9_conn_cancel(m, -ECONNRESET); 487 488 if (!list_empty(&m->req_list)) { 489 /* wait until all processes waiting on this session exit */ 490 P9_DPRINTK(P9_DEBUG_MUX, 491 "mux %p waiting for empty request queue\n", m); 492 wait_event_timeout(m->equeue, (list_empty(&m->req_list)), 5000); 493 P9_DPRINTK(P9_DEBUG_MUX, "mux %p request queue empty: %d\n", m, 494 list_empty(&m->req_list)); 495 } 496 497 p9_mux_poll_stop(m); 498 m->trans = NULL; 499 p9_idpool_destroy(m->tagpool); 500 kfree(m); 501 } 502 503 /** 504 * p9_pollwait - add poll task to the wait queue 505 * @filp: file pointer being polled 506 * @wait_address: wait_q to block on 507 * @p: poll state 508 * 509 * called by files poll operation to add v9fs-poll task to files wait queue 510 */ 511 512 static void 513 p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p) 514 { 515 int i; 516 struct p9_conn *m; 517 518 m = container_of(p, struct p9_conn, pt); 519 for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) 520 if (m->poll_waddr[i] == NULL) 521 break; 522 523 if (i >= ARRAY_SIZE(m->poll_waddr)) { 524 P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n"); 525 return; 526 } 527 528 m->poll_waddr[i] = wait_address; 529 530 if (!wait_address) { 531 P9_DPRINTK(P9_DEBUG_ERROR, "no wait_address\n"); 532 m->poll_waddr[i] = ERR_PTR(-EIO); 533 return; 534 } 535 536 init_waitqueue_entry(&m->poll_wait[i], m->poll_task->task); 537 add_wait_queue(wait_address, &m->poll_wait[i]); 538 } 539 540 /** 541 * p9_poll_mux - polls a mux and schedules read or write works if necessary 542 * @m: connection to poll 543 * 544 */ 545 546 static void p9_poll_mux(struct p9_conn *m) 547 { 548 int n; 549 550 if (m->err < 0) 551 return; 552 553 n = p9_fd_poll(m->trans, NULL); 554 if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) { 555 P9_DPRINTK(P9_DEBUG_MUX, "error mux %p err %d\n", m, n); 556 if (n >= 0) 557 n = -ECONNRESET; 558 p9_conn_cancel(m, n); 559 } 560 561 if (n & POLLIN) { 562 set_bit(Rpending, &m->wsched); 563 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m); 564 if (!test_and_set_bit(Rworksched, &m->wsched)) { 565 P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m); 566 queue_work(p9_mux_wq, &m->rq); 567 } 568 } 569 570 if (n & POLLOUT) { 571 set_bit(Wpending, &m->wsched); 572 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m); 573 if ((m->wsize || !list_empty(&m->unsent_req_list)) 574 && !test_and_set_bit(Wworksched, &m->wsched)) { 575 P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m); 576 queue_work(p9_mux_wq, &m->wq); 577 } 578 } 579 } 580 581 /** 582 * p9_poll_proc - poll worker thread 583 * @a: thread state and arguments 584 * 585 * polls all v9fs transports for new events and queues the appropriate 586 * work to the work queue 587 * 588 */ 589 590 static int p9_poll_proc(void *a) 591 { 592 struct p9_conn *m, *mtmp; 593 struct p9_mux_poll_task *vpt; 594 595 vpt = a; 596 P9_DPRINTK(P9_DEBUG_MUX, "start %p %p\n", current, vpt); 597 while (!kthread_should_stop()) { 598 set_current_state(TASK_INTERRUPTIBLE); 599 600 list_for_each_entry_safe(m, mtmp, &vpt->mux_list, mux_list) { 601 p9_poll_mux(m); 602 } 603 604 P9_DPRINTK(P9_DEBUG_MUX, "sleeping...\n"); 605 schedule_timeout(SCHED_TIMEOUT * HZ); 606 } 607 608 __set_current_state(TASK_RUNNING); 609 P9_DPRINTK(P9_DEBUG_MUX, "finish\n"); 610 return 0; 611 } 612 613 /** 614 * p9_write_work - called when a transport can send some data 615 * @work: container for work to be done 616 * 617 */ 618 619 static void p9_write_work(struct work_struct *work) 620 { 621 int n, err; 622 struct p9_conn *m; 623 struct p9_req *req; 624 625 m = container_of(work, struct p9_conn, wq); 626 627 if (m->err < 0) { 628 clear_bit(Wworksched, &m->wsched); 629 return; 630 } 631 632 if (!m->wsize) { 633 if (list_empty(&m->unsent_req_list)) { 634 clear_bit(Wworksched, &m->wsched); 635 return; 636 } 637 638 spin_lock(&m->lock); 639 again: 640 req = list_entry(m->unsent_req_list.next, struct p9_req, 641 req_list); 642 list_move_tail(&req->req_list, &m->req_list); 643 if (req->err == ERREQFLUSH) 644 goto again; 645 646 m->wbuf = req->tcall->sdata; 647 m->wsize = req->tcall->size; 648 m->wpos = 0; 649 spin_unlock(&m->lock); 650 } 651 652 P9_DPRINTK(P9_DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos, 653 m->wsize); 654 clear_bit(Wpending, &m->wsched); 655 err = p9_fd_write(m->trans, m->wbuf + m->wpos, m->wsize - m->wpos); 656 P9_DPRINTK(P9_DEBUG_MUX, "mux %p sent %d bytes\n", m, err); 657 if (err == -EAGAIN) { 658 clear_bit(Wworksched, &m->wsched); 659 return; 660 } 661 662 if (err < 0) 663 goto error; 664 else if (err == 0) { 665 err = -EREMOTEIO; 666 goto error; 667 } 668 669 m->wpos += err; 670 if (m->wpos == m->wsize) 671 m->wpos = m->wsize = 0; 672 673 if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) { 674 if (test_and_clear_bit(Wpending, &m->wsched)) 675 n = POLLOUT; 676 else 677 n = p9_fd_poll(m->trans, NULL); 678 679 if (n & POLLOUT) { 680 P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m); 681 queue_work(p9_mux_wq, &m->wq); 682 } else 683 clear_bit(Wworksched, &m->wsched); 684 } else 685 clear_bit(Wworksched, &m->wsched); 686 687 return; 688 689 error: 690 p9_conn_cancel(m, err); 691 clear_bit(Wworksched, &m->wsched); 692 } 693 694 static void process_request(struct p9_conn *m, struct p9_req *req) 695 { 696 int ecode; 697 struct p9_str *ename; 698 699 if (!req->err && req->rcall->id == P9_RERROR) { 700 ecode = req->rcall->params.rerror.errno; 701 ename = &req->rcall->params.rerror.error; 702 703 P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len, 704 ename->str); 705 706 if (m->extended) 707 req->err = -ecode; 708 709 if (!req->err) { 710 req->err = p9_errstr2errno(ename->str, ename->len); 711 712 /* string match failed */ 713 if (!req->err) { 714 PRINT_FCALL_ERROR("unknown error", req->rcall); 715 req->err = -ESERVERFAULT; 716 } 717 } 718 } else if (req->tcall && req->rcall->id != req->tcall->id + 1) { 719 P9_DPRINTK(P9_DEBUG_ERROR, 720 "fcall mismatch: expected %d, got %d\n", 721 req->tcall->id + 1, req->rcall->id); 722 if (!req->err) 723 req->err = -EIO; 724 } 725 } 726 727 /** 728 * p9_read_work - called when there is some data to be read from a transport 729 * @work: container of work to be done 730 * 731 */ 732 733 static void p9_read_work(struct work_struct *work) 734 { 735 int n, err; 736 struct p9_conn *m; 737 struct p9_req *req, *rptr, *rreq; 738 struct p9_fcall *rcall; 739 char *rbuf; 740 741 m = container_of(work, struct p9_conn, rq); 742 743 if (m->err < 0) 744 return; 745 746 rcall = NULL; 747 P9_DPRINTK(P9_DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos); 748 749 if (!m->rcall) { 750 m->rcall = 751 kmalloc(sizeof(struct p9_fcall) + m->msize, GFP_KERNEL); 752 if (!m->rcall) { 753 err = -ENOMEM; 754 goto error; 755 } 756 757 m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall); 758 m->rpos = 0; 759 } 760 761 clear_bit(Rpending, &m->wsched); 762 err = p9_fd_read(m->trans, m->rbuf + m->rpos, m->msize - m->rpos); 763 P9_DPRINTK(P9_DEBUG_MUX, "mux %p got %d bytes\n", m, err); 764 if (err == -EAGAIN) { 765 clear_bit(Rworksched, &m->wsched); 766 return; 767 } 768 769 if (err <= 0) 770 goto error; 771 772 m->rpos += err; 773 while (m->rpos > 4) { 774 n = le32_to_cpu(*(__le32 *) m->rbuf); 775 if (n >= m->msize) { 776 P9_DPRINTK(P9_DEBUG_ERROR, 777 "requested packet size too big: %d\n", n); 778 err = -EIO; 779 goto error; 780 } 781 782 if (m->rpos < n) 783 break; 784 785 err = 786 p9_deserialize_fcall(m->rbuf, n, m->rcall, m->extended); 787 if (err < 0) 788 goto error; 789 790 #ifdef CONFIG_NET_9P_DEBUG 791 if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) { 792 char buf[150]; 793 794 p9_printfcall(buf, sizeof(buf), m->rcall, 795 m->extended); 796 printk(KERN_NOTICE ">>> %p %s\n", m, buf); 797 } 798 #endif 799 800 rcall = m->rcall; 801 rbuf = m->rbuf; 802 if (m->rpos > n) { 803 m->rcall = kmalloc(sizeof(struct p9_fcall) + m->msize, 804 GFP_KERNEL); 805 if (!m->rcall) { 806 err = -ENOMEM; 807 goto error; 808 } 809 810 m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall); 811 memmove(m->rbuf, rbuf + n, m->rpos - n); 812 m->rpos -= n; 813 } else { 814 m->rcall = NULL; 815 m->rbuf = NULL; 816 m->rpos = 0; 817 } 818 819 P9_DPRINTK(P9_DEBUG_MUX, "mux %p fcall id %d tag %d\n", m, 820 rcall->id, rcall->tag); 821 822 req = NULL; 823 spin_lock(&m->lock); 824 list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) { 825 if (rreq->tag == rcall->tag) { 826 req = rreq; 827 if (req->flush != Flushing) 828 list_del(&req->req_list); 829 break; 830 } 831 } 832 spin_unlock(&m->lock); 833 834 if (req) { 835 req->rcall = rcall; 836 process_request(m, req); 837 838 if (req->flush != Flushing) { 839 if (req->cb) 840 (*req->cb) (req, req->cba); 841 else 842 kfree(req->rcall); 843 844 wake_up(&m->equeue); 845 } 846 } else { 847 if (err >= 0 && rcall->id != P9_RFLUSH) 848 P9_DPRINTK(P9_DEBUG_ERROR, 849 "unexpected response mux %p id %d tag %d\n", 850 m, rcall->id, rcall->tag); 851 kfree(rcall); 852 } 853 } 854 855 if (!list_empty(&m->req_list)) { 856 if (test_and_clear_bit(Rpending, &m->wsched)) 857 n = POLLIN; 858 else 859 n = p9_fd_poll(m->trans, NULL); 860 861 if (n & POLLIN) { 862 P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m); 863 queue_work(p9_mux_wq, &m->rq); 864 } else 865 clear_bit(Rworksched, &m->wsched); 866 } else 867 clear_bit(Rworksched, &m->wsched); 868 869 return; 870 871 error: 872 p9_conn_cancel(m, err); 873 clear_bit(Rworksched, &m->wsched); 874 } 875 876 /** 877 * p9_send_request - send 9P request 878 * The function can sleep until the request is scheduled for sending. 879 * The function can be interrupted. Return from the function is not 880 * a guarantee that the request is sent successfully. Can return errors 881 * that can be retrieved by PTR_ERR macros. 882 * 883 * @m: mux data 884 * @tc: request to be sent 885 * @cb: callback function to call when response is received 886 * @cba: parameter to pass to the callback function 887 * 888 */ 889 890 static struct p9_req *p9_send_request(struct p9_conn *m, 891 struct p9_fcall *tc, 892 p9_conn_req_callback cb, void *cba) 893 { 894 int n; 895 struct p9_req *req; 896 897 P9_DPRINTK(P9_DEBUG_MUX, "mux %p task %p tcall %p id %d\n", m, current, 898 tc, tc->id); 899 if (m->err < 0) 900 return ERR_PTR(m->err); 901 902 req = kmalloc(sizeof(struct p9_req), GFP_KERNEL); 903 if (!req) 904 return ERR_PTR(-ENOMEM); 905 906 if (tc->id == P9_TVERSION) 907 n = P9_NOTAG; 908 else 909 n = p9_mux_get_tag(m); 910 911 if (n < 0) 912 return ERR_PTR(-ENOMEM); 913 914 p9_set_tag(tc, n); 915 916 #ifdef CONFIG_NET_9P_DEBUG 917 if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) { 918 char buf[150]; 919 920 p9_printfcall(buf, sizeof(buf), tc, m->extended); 921 printk(KERN_NOTICE "<<< %p %s\n", m, buf); 922 } 923 #endif 924 925 spin_lock_init(&req->lock); 926 req->tag = n; 927 req->tcall = tc; 928 req->rcall = NULL; 929 req->err = 0; 930 req->cb = cb; 931 req->cba = cba; 932 req->flush = None; 933 934 spin_lock(&m->lock); 935 list_add_tail(&req->req_list, &m->unsent_req_list); 936 spin_unlock(&m->lock); 937 938 if (test_and_clear_bit(Wpending, &m->wsched)) 939 n = POLLOUT; 940 else 941 n = p9_fd_poll(m->trans, NULL); 942 943 if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched)) 944 queue_work(p9_mux_wq, &m->wq); 945 946 return req; 947 } 948 949 static void p9_mux_free_request(struct p9_conn *m, struct p9_req *req) 950 { 951 p9_mux_put_tag(m, req->tag); 952 kfree(req); 953 } 954 955 static void p9_mux_flush_cb(struct p9_req *freq, void *a) 956 { 957 int tag; 958 struct p9_conn *m; 959 struct p9_req *req, *rreq, *rptr; 960 961 m = a; 962 P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p rc %p err %d oldtag %d\n", m, 963 freq->tcall, freq->rcall, freq->err, 964 freq->tcall->params.tflush.oldtag); 965 966 spin_lock(&m->lock); 967 tag = freq->tcall->params.tflush.oldtag; 968 req = NULL; 969 list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) { 970 if (rreq->tag == tag) { 971 req = rreq; 972 list_del(&req->req_list); 973 break; 974 } 975 } 976 spin_unlock(&m->lock); 977 978 if (req) { 979 spin_lock(&req->lock); 980 req->flush = Flushed; 981 spin_unlock(&req->lock); 982 983 if (req->cb) 984 (*req->cb) (req, req->cba); 985 else 986 kfree(req->rcall); 987 988 wake_up(&m->equeue); 989 } 990 991 kfree(freq->tcall); 992 kfree(freq->rcall); 993 p9_mux_free_request(m, freq); 994 } 995 996 static int 997 p9_mux_flush_request(struct p9_conn *m, struct p9_req *req) 998 { 999 struct p9_fcall *fc; 1000 struct p9_req *rreq, *rptr; 1001 1002 P9_DPRINTK(P9_DEBUG_MUX, "mux %p req %p tag %d\n", m, req, req->tag); 1003 1004 /* if a response was received for a request, do nothing */ 1005 spin_lock(&req->lock); 1006 if (req->rcall || req->err) { 1007 spin_unlock(&req->lock); 1008 P9_DPRINTK(P9_DEBUG_MUX, 1009 "mux %p req %p response already received\n", m, req); 1010 return 0; 1011 } 1012 1013 req->flush = Flushing; 1014 spin_unlock(&req->lock); 1015 1016 spin_lock(&m->lock); 1017 /* if the request is not sent yet, just remove it from the list */ 1018 list_for_each_entry_safe(rreq, rptr, &m->unsent_req_list, req_list) { 1019 if (rreq->tag == req->tag) { 1020 P9_DPRINTK(P9_DEBUG_MUX, 1021 "mux %p req %p request is not sent yet\n", m, req); 1022 list_del(&rreq->req_list); 1023 req->flush = Flushed; 1024 spin_unlock(&m->lock); 1025 if (req->cb) 1026 (*req->cb) (req, req->cba); 1027 return 0; 1028 } 1029 } 1030 spin_unlock(&m->lock); 1031 1032 clear_thread_flag(TIF_SIGPENDING); 1033 fc = p9_create_tflush(req->tag); 1034 p9_send_request(m, fc, p9_mux_flush_cb, m); 1035 return 1; 1036 } 1037 1038 static void 1039 p9_conn_rpc_cb(struct p9_req *req, void *a) 1040 { 1041 struct p9_mux_rpc *r; 1042 1043 P9_DPRINTK(P9_DEBUG_MUX, "req %p r %p\n", req, a); 1044 r = a; 1045 r->rcall = req->rcall; 1046 r->err = req->err; 1047 1048 if (req->flush != None && !req->err) 1049 r->err = -ERESTARTSYS; 1050 1051 wake_up(&r->wqueue); 1052 } 1053 1054 /** 1055 * p9_fd_rpc- sends 9P request and waits until a response is available. 1056 * The function can be interrupted. 1057 * @t: transport data 1058 * @tc: request to be sent 1059 * @rc: pointer where a pointer to the response is stored 1060 * 1061 */ 1062 1063 int 1064 p9_fd_rpc(struct p9_trans *t, struct p9_fcall *tc, struct p9_fcall **rc) 1065 { 1066 struct p9_trans_fd *p = t->priv; 1067 struct p9_conn *m = p->conn; 1068 int err, sigpending; 1069 unsigned long flags; 1070 struct p9_req *req; 1071 struct p9_mux_rpc r; 1072 1073 r.err = 0; 1074 r.tcall = tc; 1075 r.rcall = NULL; 1076 r.m = m; 1077 init_waitqueue_head(&r.wqueue); 1078 1079 if (rc) 1080 *rc = NULL; 1081 1082 sigpending = 0; 1083 if (signal_pending(current)) { 1084 sigpending = 1; 1085 clear_thread_flag(TIF_SIGPENDING); 1086 } 1087 1088 req = p9_send_request(m, tc, p9_conn_rpc_cb, &r); 1089 if (IS_ERR(req)) { 1090 err = PTR_ERR(req); 1091 P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err); 1092 return err; 1093 } 1094 1095 err = wait_event_interruptible(r.wqueue, r.rcall != NULL || r.err < 0); 1096 if (r.err < 0) 1097 err = r.err; 1098 1099 if (err == -ERESTARTSYS && m->trans->status == Connected 1100 && m->err == 0) { 1101 if (p9_mux_flush_request(m, req)) { 1102 /* wait until we get response of the flush message */ 1103 do { 1104 clear_thread_flag(TIF_SIGPENDING); 1105 err = wait_event_interruptible(r.wqueue, 1106 r.rcall || r.err); 1107 } while (!r.rcall && !r.err && err == -ERESTARTSYS && 1108 m->trans->status == Connected && !m->err); 1109 1110 err = -ERESTARTSYS; 1111 } 1112 sigpending = 1; 1113 } 1114 1115 if (sigpending) { 1116 spin_lock_irqsave(¤t->sighand->siglock, flags); 1117 recalc_sigpending(); 1118 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 1119 } 1120 1121 if (rc) 1122 *rc = r.rcall; 1123 else 1124 kfree(r.rcall); 1125 1126 p9_mux_free_request(m, req); 1127 if (err > 0) 1128 err = -EIO; 1129 1130 return err; 1131 } 1132 1133 #ifdef P9_NONBLOCK 1134 /** 1135 * p9_conn_rpcnb - sends 9P request without waiting for response. 1136 * @m: mux data 1137 * @tc: request to be sent 1138 * @cb: callback function to be called when response arrives 1139 * @a: value to pass to the callback function 1140 * 1141 */ 1142 1143 int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc, 1144 p9_conn_req_callback cb, void *a) 1145 { 1146 int err; 1147 struct p9_req *req; 1148 1149 req = p9_send_request(m, tc, cb, a); 1150 if (IS_ERR(req)) { 1151 err = PTR_ERR(req); 1152 P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err); 1153 return PTR_ERR(req); 1154 } 1155 1156 P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p tag %d\n", m, tc, req->tag); 1157 return 0; 1158 } 1159 #endif /* P9_NONBLOCK */ 1160 1161 /** 1162 * p9_conn_cancel - cancel all pending requests with error 1163 * @m: mux data 1164 * @err: error code 1165 * 1166 */ 1167 1168 void p9_conn_cancel(struct p9_conn *m, int err) 1169 { 1170 struct p9_req *req, *rtmp; 1171 LIST_HEAD(cancel_list); 1172 1173 P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); 1174 m->err = err; 1175 spin_lock(&m->lock); 1176 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { 1177 list_move(&req->req_list, &cancel_list); 1178 } 1179 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { 1180 list_move(&req->req_list, &cancel_list); 1181 } 1182 spin_unlock(&m->lock); 1183 1184 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { 1185 list_del(&req->req_list); 1186 if (!req->err) 1187 req->err = err; 1188 1189 if (req->cb) 1190 (*req->cb) (req, req->cba); 1191 else 1192 kfree(req->rcall); 1193 } 1194 1195 wake_up(&m->equeue); 1196 } 1197 1198 /** 1199 * parse_options - parse mount options into session structure 1200 * @options: options string passed from mount 1201 * @opts: transport-specific structure to parse options into 1202 * 1203 * Returns 0 upon success, -ERRNO upon failure 1204 */ 1205 1206 static int parse_opts(char *params, struct p9_fd_opts *opts) 1207 { 1208 char *p; 1209 substring_t args[MAX_OPT_ARGS]; 1210 int option; 1211 char *options; 1212 int ret; 1213 1214 opts->port = P9_PORT; 1215 opts->rfd = ~0; 1216 opts->wfd = ~0; 1217 1218 if (!params) 1219 return 0; 1220 1221 options = kstrdup(params, GFP_KERNEL); 1222 if (!options) { 1223 P9_DPRINTK(P9_DEBUG_ERROR, 1224 "failed to allocate copy of option string\n"); 1225 return -ENOMEM; 1226 } 1227 1228 while ((p = strsep(&options, ",")) != NULL) { 1229 int token; 1230 int r; 1231 if (!*p) 1232 continue; 1233 token = match_token(p, tokens, args); 1234 r = match_int(&args[0], &option); 1235 if (r < 0) { 1236 P9_DPRINTK(P9_DEBUG_ERROR, 1237 "integer field, but no integer?\n"); 1238 ret = r; 1239 continue; 1240 } 1241 switch (token) { 1242 case Opt_port: 1243 opts->port = option; 1244 break; 1245 case Opt_rfdno: 1246 opts->rfd = option; 1247 break; 1248 case Opt_wfdno: 1249 opts->wfd = option; 1250 break; 1251 default: 1252 continue; 1253 } 1254 } 1255 kfree(options); 1256 return 0; 1257 } 1258 1259 static int p9_fd_open(struct p9_trans *trans, int rfd, int wfd) 1260 { 1261 struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd), 1262 GFP_KERNEL); 1263 if (!ts) 1264 return -ENOMEM; 1265 1266 ts->rd = fget(rfd); 1267 ts->wr = fget(wfd); 1268 if (!ts->rd || !ts->wr) { 1269 if (ts->rd) 1270 fput(ts->rd); 1271 if (ts->wr) 1272 fput(ts->wr); 1273 kfree(ts); 1274 return -EIO; 1275 } 1276 1277 trans->priv = ts; 1278 trans->status = Connected; 1279 1280 return 0; 1281 } 1282 1283 static int p9_socket_open(struct p9_trans *trans, struct socket *csocket) 1284 { 1285 int fd, ret; 1286 1287 csocket->sk->sk_allocation = GFP_NOIO; 1288 fd = sock_map_fd(csocket, 0); 1289 if (fd < 0) { 1290 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n"); 1291 return fd; 1292 } 1293 1294 ret = p9_fd_open(trans, fd, fd); 1295 if (ret < 0) { 1296 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n"); 1297 sockfd_put(csocket); 1298 return ret; 1299 } 1300 1301 ((struct p9_trans_fd *)trans->priv)->rd->f_flags |= O_NONBLOCK; 1302 1303 return 0; 1304 } 1305 1306 /** 1307 * p9_fd_read- read from a fd 1308 * @trans: transport instance state 1309 * @v: buffer to receive data into 1310 * @len: size of receive buffer 1311 * 1312 */ 1313 1314 static int p9_fd_read(struct p9_trans *trans, void *v, int len) 1315 { 1316 int ret; 1317 struct p9_trans_fd *ts = NULL; 1318 1319 if (trans && trans->status != Disconnected) 1320 ts = trans->priv; 1321 1322 if (!ts) 1323 return -EREMOTEIO; 1324 1325 if (!(ts->rd->f_flags & O_NONBLOCK)) 1326 P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n"); 1327 1328 ret = kernel_read(ts->rd, ts->rd->f_pos, v, len); 1329 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) 1330 trans->status = Disconnected; 1331 return ret; 1332 } 1333 1334 /** 1335 * p9_fd_write - write to a socket 1336 * @trans: transport instance state 1337 * @v: buffer to send data from 1338 * @len: size of send buffer 1339 * 1340 */ 1341 1342 static int p9_fd_write(struct p9_trans *trans, void *v, int len) 1343 { 1344 int ret; 1345 mm_segment_t oldfs; 1346 struct p9_trans_fd *ts = NULL; 1347 1348 if (trans && trans->status != Disconnected) 1349 ts = trans->priv; 1350 1351 if (!ts) 1352 return -EREMOTEIO; 1353 1354 if (!(ts->wr->f_flags & O_NONBLOCK)) 1355 P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n"); 1356 1357 oldfs = get_fs(); 1358 set_fs(get_ds()); 1359 /* The cast to a user pointer is valid due to the set_fs() */ 1360 ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos); 1361 set_fs(oldfs); 1362 1363 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) 1364 trans->status = Disconnected; 1365 return ret; 1366 } 1367 1368 static unsigned int 1369 p9_fd_poll(struct p9_trans *trans, struct poll_table_struct *pt) 1370 { 1371 int ret, n; 1372 struct p9_trans_fd *ts = NULL; 1373 mm_segment_t oldfs; 1374 1375 if (trans && trans->status == Connected) 1376 ts = trans->priv; 1377 1378 if (!ts) 1379 return -EREMOTEIO; 1380 1381 if (!ts->rd->f_op || !ts->rd->f_op->poll) 1382 return -EIO; 1383 1384 if (!ts->wr->f_op || !ts->wr->f_op->poll) 1385 return -EIO; 1386 1387 oldfs = get_fs(); 1388 set_fs(get_ds()); 1389 1390 ret = ts->rd->f_op->poll(ts->rd, pt); 1391 if (ret < 0) 1392 goto end; 1393 1394 if (ts->rd != ts->wr) { 1395 n = ts->wr->f_op->poll(ts->wr, pt); 1396 if (n < 0) { 1397 ret = n; 1398 goto end; 1399 } 1400 ret = (ret & ~POLLOUT) | (n & ~POLLIN); 1401 } 1402 1403 end: 1404 set_fs(oldfs); 1405 return ret; 1406 } 1407 1408 /** 1409 * p9_fd_close - shutdown socket 1410 * @trans: private socket structure 1411 * 1412 */ 1413 1414 static void p9_fd_close(struct p9_trans *trans) 1415 { 1416 struct p9_trans_fd *ts; 1417 1418 if (!trans) 1419 return; 1420 1421 ts = xchg(&trans->priv, NULL); 1422 1423 if (!ts) 1424 return; 1425 1426 p9_conn_destroy(ts->conn); 1427 1428 trans->status = Disconnected; 1429 if (ts->rd) 1430 fput(ts->rd); 1431 if (ts->wr) 1432 fput(ts->wr); 1433 kfree(ts); 1434 } 1435 1436 /* 1437 * stolen from NFS - maybe should be made a generic function? 1438 */ 1439 static inline int valid_ipaddr4(const char *buf) 1440 { 1441 int rc, count, in[4]; 1442 1443 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]); 1444 if (rc != 4) 1445 return -EINVAL; 1446 for (count = 0; count < 4; count++) { 1447 if (in[count] > 255) 1448 return -EINVAL; 1449 } 1450 return 0; 1451 } 1452 1453 static struct p9_trans * 1454 p9_trans_create_tcp(const char *addr, char *args, int msize, unsigned char dotu) 1455 { 1456 int err; 1457 struct p9_trans *trans; 1458 struct socket *csocket; 1459 struct sockaddr_in sin_server; 1460 struct p9_fd_opts opts; 1461 struct p9_trans_fd *p; 1462 1463 err = parse_opts(args, &opts); 1464 if (err < 0) 1465 return ERR_PTR(err); 1466 1467 if (valid_ipaddr4(addr) < 0) 1468 return ERR_PTR(-EINVAL); 1469 1470 csocket = NULL; 1471 trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); 1472 if (!trans) 1473 return ERR_PTR(-ENOMEM); 1474 trans->msize = msize; 1475 trans->extended = dotu; 1476 trans->rpc = p9_fd_rpc; 1477 trans->close = p9_fd_close; 1478 1479 sin_server.sin_family = AF_INET; 1480 sin_server.sin_addr.s_addr = in_aton(addr); 1481 sin_server.sin_port = htons(opts.port); 1482 sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket); 1483 1484 if (!csocket) { 1485 P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n"); 1486 err = -EIO; 1487 goto error; 1488 } 1489 1490 err = csocket->ops->connect(csocket, 1491 (struct sockaddr *)&sin_server, 1492 sizeof(struct sockaddr_in), 0); 1493 if (err < 0) { 1494 P9_EPRINTK(KERN_ERR, 1495 "p9_trans_tcp: problem connecting socket to %s\n", 1496 addr); 1497 goto error; 1498 } 1499 1500 err = p9_socket_open(trans, csocket); 1501 if (err < 0) 1502 goto error; 1503 1504 p = (struct p9_trans_fd *) trans->priv; 1505 p->conn = p9_conn_create(trans); 1506 if (IS_ERR(p->conn)) { 1507 err = PTR_ERR(p->conn); 1508 p->conn = NULL; 1509 goto error; 1510 } 1511 1512 return trans; 1513 1514 error: 1515 if (csocket) 1516 sock_release(csocket); 1517 1518 kfree(trans); 1519 return ERR_PTR(err); 1520 } 1521 1522 static struct p9_trans * 1523 p9_trans_create_unix(const char *addr, char *args, int msize, 1524 unsigned char dotu) 1525 { 1526 int err; 1527 struct socket *csocket; 1528 struct sockaddr_un sun_server; 1529 struct p9_trans *trans; 1530 struct p9_trans_fd *p; 1531 1532 csocket = NULL; 1533 trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); 1534 if (!trans) 1535 return ERR_PTR(-ENOMEM); 1536 1537 trans->rpc = p9_fd_rpc; 1538 trans->close = p9_fd_close; 1539 1540 if (strlen(addr) > UNIX_PATH_MAX) { 1541 P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n", 1542 addr); 1543 err = -ENAMETOOLONG; 1544 goto error; 1545 } 1546 1547 sun_server.sun_family = PF_UNIX; 1548 strcpy(sun_server.sun_path, addr); 1549 sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket); 1550 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, 1551 sizeof(struct sockaddr_un) - 1, 0); 1552 if (err < 0) { 1553 P9_EPRINTK(KERN_ERR, 1554 "p9_trans_unix: problem connecting socket: %s: %d\n", 1555 addr, err); 1556 goto error; 1557 } 1558 1559 err = p9_socket_open(trans, csocket); 1560 if (err < 0) 1561 goto error; 1562 1563 trans->msize = msize; 1564 trans->extended = dotu; 1565 p = (struct p9_trans_fd *) trans->priv; 1566 p->conn = p9_conn_create(trans); 1567 if (IS_ERR(p->conn)) { 1568 err = PTR_ERR(p->conn); 1569 p->conn = NULL; 1570 goto error; 1571 } 1572 1573 return trans; 1574 1575 error: 1576 if (csocket) 1577 sock_release(csocket); 1578 1579 kfree(trans); 1580 return ERR_PTR(err); 1581 } 1582 1583 static struct p9_trans * 1584 p9_trans_create_fd(const char *name, char *args, int msize, 1585 unsigned char extended) 1586 { 1587 int err; 1588 struct p9_trans *trans; 1589 struct p9_fd_opts opts; 1590 struct p9_trans_fd *p; 1591 1592 parse_opts(args, &opts); 1593 1594 if (opts.rfd == ~0 || opts.wfd == ~0) { 1595 printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n"); 1596 return ERR_PTR(-ENOPROTOOPT); 1597 } 1598 1599 trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); 1600 if (!trans) 1601 return ERR_PTR(-ENOMEM); 1602 1603 trans->rpc = p9_fd_rpc; 1604 trans->close = p9_fd_close; 1605 1606 err = p9_fd_open(trans, opts.rfd, opts.wfd); 1607 if (err < 0) 1608 goto error; 1609 1610 trans->msize = msize; 1611 trans->extended = extended; 1612 p = (struct p9_trans_fd *) trans->priv; 1613 p->conn = p9_conn_create(trans); 1614 if (IS_ERR(p->conn)) { 1615 err = PTR_ERR(p->conn); 1616 p->conn = NULL; 1617 goto error; 1618 } 1619 1620 return trans; 1621 1622 error: 1623 kfree(trans); 1624 return ERR_PTR(err); 1625 } 1626 1627 static struct p9_trans_module p9_tcp_trans = { 1628 .name = "tcp", 1629 .maxsize = MAX_SOCK_BUF, 1630 .def = 1, 1631 .create = p9_trans_create_tcp, 1632 }; 1633 1634 static struct p9_trans_module p9_unix_trans = { 1635 .name = "unix", 1636 .maxsize = MAX_SOCK_BUF, 1637 .def = 0, 1638 .create = p9_trans_create_unix, 1639 }; 1640 1641 static struct p9_trans_module p9_fd_trans = { 1642 .name = "fd", 1643 .maxsize = MAX_SOCK_BUF, 1644 .def = 0, 1645 .create = p9_trans_create_fd, 1646 }; 1647 1648 int p9_trans_fd_init(void) 1649 { 1650 int ret = p9_mux_global_init(); 1651 if (ret) { 1652 printk(KERN_WARNING "9p: starting mux failed\n"); 1653 return ret; 1654 } 1655 1656 v9fs_register_trans(&p9_tcp_trans); 1657 v9fs_register_trans(&p9_unix_trans); 1658 v9fs_register_trans(&p9_fd_trans); 1659 1660 return 0; 1661 } 1662 EXPORT_SYMBOL(p9_trans_fd_init); 1663