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 <linux/slab.h> 42 #include <net/9p/9p.h> 43 #include <net/9p/client.h> 44 #include <net/9p/transport.h> 45 46 #include <linux/syscalls.h> /* killme */ 47 48 #define P9_PORT 564 49 #define MAX_SOCK_BUF (64*1024) 50 #define MAXPOLLWADDR 2 51 52 /** 53 * struct p9_fd_opts - per-transport options 54 * @rfd: file descriptor for reading (trans=fd) 55 * @wfd: file descriptor for writing (trans=fd) 56 * @port: port to connect to (trans=tcp) 57 * 58 */ 59 60 struct p9_fd_opts { 61 int rfd; 62 int wfd; 63 u16 port; 64 }; 65 66 /** 67 * struct p9_trans_fd - transport state 68 * @rd: reference to file to read from 69 * @wr: reference of file to write to 70 * @conn: connection state reference 71 * 72 */ 73 74 struct p9_trans_fd { 75 struct file *rd; 76 struct file *wr; 77 struct p9_conn *conn; 78 }; 79 80 /* 81 * Option Parsing (code inspired by NFS code) 82 * - a little lazy - parse all fd-transport options 83 */ 84 85 enum { 86 /* Options that take integer arguments */ 87 Opt_port, Opt_rfdno, Opt_wfdno, Opt_err, 88 }; 89 90 static const match_table_t tokens = { 91 {Opt_port, "port=%u"}, 92 {Opt_rfdno, "rfdno=%u"}, 93 {Opt_wfdno, "wfdno=%u"}, 94 {Opt_err, NULL}, 95 }; 96 97 enum { 98 Rworksched = 1, /* read work scheduled or running */ 99 Rpending = 2, /* can read */ 100 Wworksched = 4, /* write work scheduled or running */ 101 Wpending = 8, /* can write */ 102 }; 103 104 struct p9_poll_wait { 105 struct p9_conn *conn; 106 wait_queue_t wait; 107 wait_queue_head_t *wait_addr; 108 }; 109 110 /** 111 * struct p9_conn - fd mux connection state information 112 * @mux_list: list link for mux to manage multiple connections (?) 113 * @client: reference to client instance for this connection 114 * @err: error state 115 * @req_list: accounting for requests which have been sent 116 * @unsent_req_list: accounting for requests that haven't been sent 117 * @req: current request being processed (if any) 118 * @tmp_buf: temporary buffer to read in header 119 * @rsize: amount to read for current frame 120 * @rpos: read position in current frame 121 * @rbuf: current read buffer 122 * @wpos: write position for current frame 123 * @wsize: amount of data to write for current frame 124 * @wbuf: current write buffer 125 * @poll_pending_link: pending links to be polled per conn 126 * @poll_wait: array of wait_q's for various worker threads 127 * @pt: poll state 128 * @rq: current read work 129 * @wq: current write work 130 * @wsched: ???? 131 * 132 */ 133 134 struct p9_conn { 135 struct list_head mux_list; 136 struct p9_client *client; 137 int err; 138 struct list_head req_list; 139 struct list_head unsent_req_list; 140 struct p9_req_t *req; 141 char tmp_buf[7]; 142 int rsize; 143 int rpos; 144 char *rbuf; 145 int wpos; 146 int wsize; 147 char *wbuf; 148 struct list_head poll_pending_link; 149 struct p9_poll_wait poll_wait[MAXPOLLWADDR]; 150 poll_table pt; 151 struct work_struct rq; 152 struct work_struct wq; 153 unsigned long wsched; 154 }; 155 156 static void p9_poll_workfn(struct work_struct *work); 157 158 static DEFINE_SPINLOCK(p9_poll_lock); 159 static LIST_HEAD(p9_poll_pending_list); 160 static DECLARE_WORK(p9_poll_work, p9_poll_workfn); 161 162 static void p9_mux_poll_stop(struct p9_conn *m) 163 { 164 unsigned long flags; 165 int i; 166 167 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { 168 struct p9_poll_wait *pwait = &m->poll_wait[i]; 169 170 if (pwait->wait_addr) { 171 remove_wait_queue(pwait->wait_addr, &pwait->wait); 172 pwait->wait_addr = NULL; 173 } 174 } 175 176 spin_lock_irqsave(&p9_poll_lock, flags); 177 list_del_init(&m->poll_pending_link); 178 spin_unlock_irqrestore(&p9_poll_lock, flags); 179 } 180 181 /** 182 * p9_conn_cancel - cancel all pending requests with error 183 * @m: mux data 184 * @err: error code 185 * 186 */ 187 188 static void p9_conn_cancel(struct p9_conn *m, int err) 189 { 190 struct p9_req_t *req, *rtmp; 191 unsigned long flags; 192 LIST_HEAD(cancel_list); 193 194 P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); 195 196 spin_lock_irqsave(&m->client->lock, flags); 197 198 if (m->err) { 199 spin_unlock_irqrestore(&m->client->lock, flags); 200 return; 201 } 202 203 m->err = err; 204 205 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { 206 req->status = REQ_STATUS_ERROR; 207 if (!req->t_err) 208 req->t_err = err; 209 list_move(&req->req_list, &cancel_list); 210 } 211 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { 212 req->status = REQ_STATUS_ERROR; 213 if (!req->t_err) 214 req->t_err = err; 215 list_move(&req->req_list, &cancel_list); 216 } 217 spin_unlock_irqrestore(&m->client->lock, flags); 218 219 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { 220 P9_DPRINTK(P9_DEBUG_ERROR, "call back req %p\n", req); 221 list_del(&req->req_list); 222 p9_client_cb(m->client, req); 223 } 224 } 225 226 static int 227 p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt) 228 { 229 int ret, n; 230 struct p9_trans_fd *ts = NULL; 231 232 if (client && client->status == Connected) 233 ts = client->trans; 234 235 if (!ts) 236 return -EREMOTEIO; 237 238 if (!ts->rd->f_op || !ts->rd->f_op->poll) 239 return -EIO; 240 241 if (!ts->wr->f_op || !ts->wr->f_op->poll) 242 return -EIO; 243 244 ret = ts->rd->f_op->poll(ts->rd, pt); 245 if (ret < 0) 246 return ret; 247 248 if (ts->rd != ts->wr) { 249 n = ts->wr->f_op->poll(ts->wr, pt); 250 if (n < 0) 251 return n; 252 ret = (ret & ~POLLOUT) | (n & ~POLLIN); 253 } 254 255 return ret; 256 } 257 258 /** 259 * p9_fd_read- read from a fd 260 * @client: client instance 261 * @v: buffer to receive data into 262 * @len: size of receive buffer 263 * 264 */ 265 266 static int p9_fd_read(struct p9_client *client, void *v, int len) 267 { 268 int ret; 269 struct p9_trans_fd *ts = NULL; 270 271 if (client && client->status != Disconnected) 272 ts = client->trans; 273 274 if (!ts) 275 return -EREMOTEIO; 276 277 if (!(ts->rd->f_flags & O_NONBLOCK)) 278 P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n"); 279 280 ret = kernel_read(ts->rd, ts->rd->f_pos, v, len); 281 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) 282 client->status = Disconnected; 283 return ret; 284 } 285 286 /** 287 * p9_read_work - called when there is some data to be read from a transport 288 * @work: container of work to be done 289 * 290 */ 291 292 static void p9_read_work(struct work_struct *work) 293 { 294 int n, err; 295 struct p9_conn *m; 296 297 m = container_of(work, struct p9_conn, rq); 298 299 if (m->err < 0) 300 return; 301 302 P9_DPRINTK(P9_DEBUG_TRANS, "start mux %p pos %d\n", m, m->rpos); 303 304 if (!m->rbuf) { 305 m->rbuf = m->tmp_buf; 306 m->rpos = 0; 307 m->rsize = 7; /* start by reading header */ 308 } 309 310 clear_bit(Rpending, &m->wsched); 311 P9_DPRINTK(P9_DEBUG_TRANS, "read mux %p pos %d size: %d = %d\n", m, 312 m->rpos, m->rsize, m->rsize-m->rpos); 313 err = p9_fd_read(m->client, m->rbuf + m->rpos, 314 m->rsize - m->rpos); 315 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err); 316 if (err == -EAGAIN) { 317 clear_bit(Rworksched, &m->wsched); 318 return; 319 } 320 321 if (err <= 0) 322 goto error; 323 324 m->rpos += err; 325 326 if ((!m->req) && (m->rpos == m->rsize)) { /* header read in */ 327 u16 tag; 328 P9_DPRINTK(P9_DEBUG_TRANS, "got new header\n"); 329 330 n = le32_to_cpu(*(__le32 *) m->rbuf); /* read packet size */ 331 if (n >= m->client->msize) { 332 P9_DPRINTK(P9_DEBUG_ERROR, 333 "requested packet size too big: %d\n", n); 334 err = -EIO; 335 goto error; 336 } 337 338 tag = le16_to_cpu(*(__le16 *) (m->rbuf+5)); /* read tag */ 339 P9_DPRINTK(P9_DEBUG_TRANS, 340 "mux %p pkt: size: %d bytes tag: %d\n", m, n, tag); 341 342 m->req = p9_tag_lookup(m->client, tag); 343 if (!m->req || (m->req->status != REQ_STATUS_SENT && 344 m->req->status != REQ_STATUS_FLSH)) { 345 P9_DPRINTK(P9_DEBUG_ERROR, "Unexpected packet tag %d\n", 346 tag); 347 err = -EIO; 348 goto error; 349 } 350 351 if (m->req->rc == NULL) { 352 m->req->rc = kmalloc(sizeof(struct p9_fcall) + 353 m->client->msize, GFP_NOFS); 354 if (!m->req->rc) { 355 m->req = NULL; 356 err = -ENOMEM; 357 goto error; 358 } 359 } 360 m->rbuf = (char *)m->req->rc + sizeof(struct p9_fcall); 361 memcpy(m->rbuf, m->tmp_buf, m->rsize); 362 m->rsize = n; 363 } 364 365 /* not an else because some packets (like clunk) have no payload */ 366 if ((m->req) && (m->rpos == m->rsize)) { /* packet is read in */ 367 P9_DPRINTK(P9_DEBUG_TRANS, "got new packet\n"); 368 spin_lock(&m->client->lock); 369 if (m->req->status != REQ_STATUS_ERROR) 370 m->req->status = REQ_STATUS_RCVD; 371 list_del(&m->req->req_list); 372 spin_unlock(&m->client->lock); 373 p9_client_cb(m->client, m->req); 374 m->rbuf = NULL; 375 m->rpos = 0; 376 m->rsize = 0; 377 m->req = NULL; 378 } 379 380 if (!list_empty(&m->req_list)) { 381 if (test_and_clear_bit(Rpending, &m->wsched)) 382 n = POLLIN; 383 else 384 n = p9_fd_poll(m->client, NULL); 385 386 if (n & POLLIN) { 387 P9_DPRINTK(P9_DEBUG_TRANS, "sched read work %p\n", m); 388 schedule_work(&m->rq); 389 } else 390 clear_bit(Rworksched, &m->wsched); 391 } else 392 clear_bit(Rworksched, &m->wsched); 393 394 return; 395 error: 396 p9_conn_cancel(m, err); 397 clear_bit(Rworksched, &m->wsched); 398 } 399 400 /** 401 * p9_fd_write - write to a socket 402 * @client: client instance 403 * @v: buffer to send data from 404 * @len: size of send buffer 405 * 406 */ 407 408 static int p9_fd_write(struct p9_client *client, void *v, int len) 409 { 410 int ret; 411 mm_segment_t oldfs; 412 struct p9_trans_fd *ts = NULL; 413 414 if (client && client->status != Disconnected) 415 ts = client->trans; 416 417 if (!ts) 418 return -EREMOTEIO; 419 420 if (!(ts->wr->f_flags & O_NONBLOCK)) 421 P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n"); 422 423 oldfs = get_fs(); 424 set_fs(get_ds()); 425 /* The cast to a user pointer is valid due to the set_fs() */ 426 ret = vfs_write(ts->wr, (__force void __user *)v, len, &ts->wr->f_pos); 427 set_fs(oldfs); 428 429 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) 430 client->status = Disconnected; 431 return ret; 432 } 433 434 /** 435 * p9_write_work - called when a transport can send some data 436 * @work: container for work to be done 437 * 438 */ 439 440 static void p9_write_work(struct work_struct *work) 441 { 442 int n, err; 443 struct p9_conn *m; 444 struct p9_req_t *req; 445 446 m = container_of(work, struct p9_conn, wq); 447 448 if (m->err < 0) { 449 clear_bit(Wworksched, &m->wsched); 450 return; 451 } 452 453 if (!m->wsize) { 454 if (list_empty(&m->unsent_req_list)) { 455 clear_bit(Wworksched, &m->wsched); 456 return; 457 } 458 459 spin_lock(&m->client->lock); 460 req = list_entry(m->unsent_req_list.next, struct p9_req_t, 461 req_list); 462 req->status = REQ_STATUS_SENT; 463 P9_DPRINTK(P9_DEBUG_TRANS, "move req %p\n", req); 464 list_move_tail(&req->req_list, &m->req_list); 465 466 m->wbuf = req->tc->sdata; 467 m->wsize = req->tc->size; 468 m->wpos = 0; 469 spin_unlock(&m->client->lock); 470 } 471 472 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p pos %d size %d\n", m, m->wpos, 473 m->wsize); 474 clear_bit(Wpending, &m->wsched); 475 err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos); 476 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err); 477 if (err == -EAGAIN) { 478 clear_bit(Wworksched, &m->wsched); 479 return; 480 } 481 482 if (err < 0) 483 goto error; 484 else if (err == 0) { 485 err = -EREMOTEIO; 486 goto error; 487 } 488 489 m->wpos += err; 490 if (m->wpos == m->wsize) 491 m->wpos = m->wsize = 0; 492 493 if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) { 494 if (test_and_clear_bit(Wpending, &m->wsched)) 495 n = POLLOUT; 496 else 497 n = p9_fd_poll(m->client, NULL); 498 499 if (n & POLLOUT) { 500 P9_DPRINTK(P9_DEBUG_TRANS, "sched write work %p\n", m); 501 schedule_work(&m->wq); 502 } else 503 clear_bit(Wworksched, &m->wsched); 504 } else 505 clear_bit(Wworksched, &m->wsched); 506 507 return; 508 509 error: 510 p9_conn_cancel(m, err); 511 clear_bit(Wworksched, &m->wsched); 512 } 513 514 static int p9_pollwake(wait_queue_t *wait, unsigned mode, int sync, void *key) 515 { 516 struct p9_poll_wait *pwait = 517 container_of(wait, struct p9_poll_wait, wait); 518 struct p9_conn *m = pwait->conn; 519 unsigned long flags; 520 521 spin_lock_irqsave(&p9_poll_lock, flags); 522 if (list_empty(&m->poll_pending_link)) 523 list_add_tail(&m->poll_pending_link, &p9_poll_pending_list); 524 spin_unlock_irqrestore(&p9_poll_lock, flags); 525 526 schedule_work(&p9_poll_work); 527 return 1; 528 } 529 530 /** 531 * p9_pollwait - add poll task to the wait queue 532 * @filp: file pointer being polled 533 * @wait_address: wait_q to block on 534 * @p: poll state 535 * 536 * called by files poll operation to add v9fs-poll task to files wait queue 537 */ 538 539 static void 540 p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p) 541 { 542 struct p9_conn *m = container_of(p, struct p9_conn, pt); 543 struct p9_poll_wait *pwait = NULL; 544 int i; 545 546 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { 547 if (m->poll_wait[i].wait_addr == NULL) { 548 pwait = &m->poll_wait[i]; 549 break; 550 } 551 } 552 553 if (!pwait) { 554 P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n"); 555 return; 556 } 557 558 pwait->conn = m; 559 pwait->wait_addr = wait_address; 560 init_waitqueue_func_entry(&pwait->wait, p9_pollwake); 561 add_wait_queue(wait_address, &pwait->wait); 562 } 563 564 /** 565 * p9_conn_create - allocate and initialize the per-session mux data 566 * @client: client instance 567 * 568 * Note: Creates the polling task if this is the first session. 569 */ 570 571 static struct p9_conn *p9_conn_create(struct p9_client *client) 572 { 573 int n; 574 struct p9_conn *m; 575 576 P9_DPRINTK(P9_DEBUG_TRANS, "client %p msize %d\n", client, 577 client->msize); 578 m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL); 579 if (!m) 580 return ERR_PTR(-ENOMEM); 581 582 INIT_LIST_HEAD(&m->mux_list); 583 m->client = client; 584 585 INIT_LIST_HEAD(&m->req_list); 586 INIT_LIST_HEAD(&m->unsent_req_list); 587 INIT_WORK(&m->rq, p9_read_work); 588 INIT_WORK(&m->wq, p9_write_work); 589 INIT_LIST_HEAD(&m->poll_pending_link); 590 init_poll_funcptr(&m->pt, p9_pollwait); 591 592 n = p9_fd_poll(client, &m->pt); 593 if (n & POLLIN) { 594 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can read\n", m); 595 set_bit(Rpending, &m->wsched); 596 } 597 598 if (n & POLLOUT) { 599 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can write\n", m); 600 set_bit(Wpending, &m->wsched); 601 } 602 603 return m; 604 } 605 606 /** 607 * p9_poll_mux - polls a mux and schedules read or write works if necessary 608 * @m: connection to poll 609 * 610 */ 611 612 static void p9_poll_mux(struct p9_conn *m) 613 { 614 int n; 615 616 if (m->err < 0) 617 return; 618 619 n = p9_fd_poll(m->client, NULL); 620 if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) { 621 P9_DPRINTK(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n); 622 if (n >= 0) 623 n = -ECONNRESET; 624 p9_conn_cancel(m, n); 625 } 626 627 if (n & POLLIN) { 628 set_bit(Rpending, &m->wsched); 629 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can read\n", m); 630 if (!test_and_set_bit(Rworksched, &m->wsched)) { 631 P9_DPRINTK(P9_DEBUG_TRANS, "sched read work %p\n", m); 632 schedule_work(&m->rq); 633 } 634 } 635 636 if (n & POLLOUT) { 637 set_bit(Wpending, &m->wsched); 638 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can write\n", m); 639 if ((m->wsize || !list_empty(&m->unsent_req_list)) && 640 !test_and_set_bit(Wworksched, &m->wsched)) { 641 P9_DPRINTK(P9_DEBUG_TRANS, "sched write work %p\n", m); 642 schedule_work(&m->wq); 643 } 644 } 645 } 646 647 /** 648 * p9_fd_request - send 9P request 649 * The function can sleep until the request is scheduled for sending. 650 * The function can be interrupted. Return from the function is not 651 * a guarantee that the request is sent successfully. 652 * 653 * @client: client instance 654 * @req: request to be sent 655 * 656 */ 657 658 static int p9_fd_request(struct p9_client *client, struct p9_req_t *req) 659 { 660 int n; 661 struct p9_trans_fd *ts = client->trans; 662 struct p9_conn *m = ts->conn; 663 664 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n", m, 665 current, req->tc, req->tc->id); 666 if (m->err < 0) 667 return m->err; 668 669 spin_lock(&client->lock); 670 req->status = REQ_STATUS_UNSENT; 671 list_add_tail(&req->req_list, &m->unsent_req_list); 672 spin_unlock(&client->lock); 673 674 if (test_and_clear_bit(Wpending, &m->wsched)) 675 n = POLLOUT; 676 else 677 n = p9_fd_poll(m->client, NULL); 678 679 if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched)) 680 schedule_work(&m->wq); 681 682 return 0; 683 } 684 685 static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req) 686 { 687 int ret = 1; 688 689 P9_DPRINTK(P9_DEBUG_TRANS, "client %p req %p\n", client, req); 690 691 spin_lock(&client->lock); 692 693 if (req->status == REQ_STATUS_UNSENT) { 694 list_del(&req->req_list); 695 req->status = REQ_STATUS_FLSHD; 696 ret = 0; 697 } else if (req->status == REQ_STATUS_SENT) 698 req->status = REQ_STATUS_FLSH; 699 700 spin_unlock(&client->lock); 701 702 return ret; 703 } 704 705 /** 706 * parse_opts - parse mount options into p9_fd_opts structure 707 * @params: options string passed from mount 708 * @opts: fd transport-specific structure to parse options into 709 * 710 * Returns 0 upon success, -ERRNO upon failure 711 */ 712 713 static int parse_opts(char *params, struct p9_fd_opts *opts) 714 { 715 char *p; 716 substring_t args[MAX_OPT_ARGS]; 717 int option; 718 char *options, *tmp_options; 719 720 opts->port = P9_PORT; 721 opts->rfd = ~0; 722 opts->wfd = ~0; 723 724 if (!params) 725 return 0; 726 727 tmp_options = kstrdup(params, GFP_KERNEL); 728 if (!tmp_options) { 729 P9_DPRINTK(P9_DEBUG_ERROR, 730 "failed to allocate copy of option string\n"); 731 return -ENOMEM; 732 } 733 options = tmp_options; 734 735 while ((p = strsep(&options, ",")) != NULL) { 736 int token; 737 int r; 738 if (!*p) 739 continue; 740 token = match_token(p, tokens, args); 741 if (token != Opt_err) { 742 r = match_int(&args[0], &option); 743 if (r < 0) { 744 P9_DPRINTK(P9_DEBUG_ERROR, 745 "integer field, but no integer?\n"); 746 continue; 747 } 748 } 749 switch (token) { 750 case Opt_port: 751 opts->port = option; 752 break; 753 case Opt_rfdno: 754 opts->rfd = option; 755 break; 756 case Opt_wfdno: 757 opts->wfd = option; 758 break; 759 default: 760 continue; 761 } 762 } 763 764 kfree(tmp_options); 765 return 0; 766 } 767 768 static int p9_fd_open(struct p9_client *client, int rfd, int wfd) 769 { 770 struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd), 771 GFP_KERNEL); 772 if (!ts) 773 return -ENOMEM; 774 775 ts->rd = fget(rfd); 776 ts->wr = fget(wfd); 777 if (!ts->rd || !ts->wr) { 778 if (ts->rd) 779 fput(ts->rd); 780 if (ts->wr) 781 fput(ts->wr); 782 kfree(ts); 783 return -EIO; 784 } 785 786 client->trans = ts; 787 client->status = Connected; 788 789 return 0; 790 } 791 792 static int p9_socket_open(struct p9_client *client, struct socket *csocket) 793 { 794 struct p9_trans_fd *p; 795 int ret, fd; 796 797 p = kmalloc(sizeof(struct p9_trans_fd), GFP_KERNEL); 798 if (!p) 799 return -ENOMEM; 800 801 csocket->sk->sk_allocation = GFP_NOIO; 802 fd = sock_map_fd(csocket, 0); 803 if (fd < 0) { 804 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n"); 805 sock_release(csocket); 806 kfree(p); 807 return fd; 808 } 809 810 get_file(csocket->file); 811 get_file(csocket->file); 812 p->wr = p->rd = csocket->file; 813 client->trans = p; 814 client->status = Connected; 815 816 sys_close(fd); /* still racy */ 817 818 p->rd->f_flags |= O_NONBLOCK; 819 820 p->conn = p9_conn_create(client); 821 if (IS_ERR(p->conn)) { 822 ret = PTR_ERR(p->conn); 823 p->conn = NULL; 824 kfree(p); 825 sockfd_put(csocket); 826 sockfd_put(csocket); 827 return ret; 828 } 829 return 0; 830 } 831 832 /** 833 * p9_mux_destroy - cancels all pending requests and frees mux resources 834 * @m: mux to destroy 835 * 836 */ 837 838 static void p9_conn_destroy(struct p9_conn *m) 839 { 840 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p prev %p next %p\n", m, 841 m->mux_list.prev, m->mux_list.next); 842 843 p9_mux_poll_stop(m); 844 cancel_work_sync(&m->rq); 845 cancel_work_sync(&m->wq); 846 847 p9_conn_cancel(m, -ECONNRESET); 848 849 m->client = NULL; 850 kfree(m); 851 } 852 853 /** 854 * p9_fd_close - shutdown file descriptor transport 855 * @client: client instance 856 * 857 */ 858 859 static void p9_fd_close(struct p9_client *client) 860 { 861 struct p9_trans_fd *ts; 862 863 if (!client) 864 return; 865 866 ts = client->trans; 867 if (!ts) 868 return; 869 870 client->status = Disconnected; 871 872 p9_conn_destroy(ts->conn); 873 874 if (ts->rd) 875 fput(ts->rd); 876 if (ts->wr) 877 fput(ts->wr); 878 879 kfree(ts); 880 } 881 882 /* 883 * stolen from NFS - maybe should be made a generic function? 884 */ 885 static inline int valid_ipaddr4(const char *buf) 886 { 887 int rc, count, in[4]; 888 889 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]); 890 if (rc != 4) 891 return -EINVAL; 892 for (count = 0; count < 4; count++) { 893 if (in[count] > 255) 894 return -EINVAL; 895 } 896 return 0; 897 } 898 899 static int 900 p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args) 901 { 902 int err; 903 struct socket *csocket; 904 struct sockaddr_in sin_server; 905 struct p9_fd_opts opts; 906 907 err = parse_opts(args, &opts); 908 if (err < 0) 909 return err; 910 911 if (valid_ipaddr4(addr) < 0) 912 return -EINVAL; 913 914 csocket = NULL; 915 916 sin_server.sin_family = AF_INET; 917 sin_server.sin_addr.s_addr = in_aton(addr); 918 sin_server.sin_port = htons(opts.port); 919 err = __sock_create(read_pnet(¤t->nsproxy->net_ns), PF_INET, 920 SOCK_STREAM, IPPROTO_TCP, &csocket, 1); 921 if (err) { 922 P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n"); 923 return err; 924 } 925 926 err = csocket->ops->connect(csocket, 927 (struct sockaddr *)&sin_server, 928 sizeof(struct sockaddr_in), 0); 929 if (err < 0) { 930 P9_EPRINTK(KERN_ERR, 931 "p9_trans_tcp: problem connecting socket to %s\n", 932 addr); 933 sock_release(csocket); 934 return err; 935 } 936 937 return p9_socket_open(client, csocket); 938 } 939 940 static int 941 p9_fd_create_unix(struct p9_client *client, const char *addr, char *args) 942 { 943 int err; 944 struct socket *csocket; 945 struct sockaddr_un sun_server; 946 947 csocket = NULL; 948 949 if (strlen(addr) >= UNIX_PATH_MAX) { 950 P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n", 951 addr); 952 return -ENAMETOOLONG; 953 } 954 955 sun_server.sun_family = PF_UNIX; 956 strcpy(sun_server.sun_path, addr); 957 err = __sock_create(read_pnet(¤t->nsproxy->net_ns), PF_UNIX, 958 SOCK_STREAM, 0, &csocket, 1); 959 if (err < 0) { 960 P9_EPRINTK(KERN_ERR, "p9_trans_unix: problem creating socket\n"); 961 return err; 962 } 963 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, 964 sizeof(struct sockaddr_un) - 1, 0); 965 if (err < 0) { 966 P9_EPRINTK(KERN_ERR, 967 "p9_trans_unix: problem connecting socket: %s: %d\n", 968 addr, err); 969 sock_release(csocket); 970 return err; 971 } 972 973 return p9_socket_open(client, csocket); 974 } 975 976 static int 977 p9_fd_create(struct p9_client *client, const char *addr, char *args) 978 { 979 int err; 980 struct p9_fd_opts opts; 981 struct p9_trans_fd *p; 982 983 parse_opts(args, &opts); 984 985 if (opts.rfd == ~0 || opts.wfd == ~0) { 986 printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n"); 987 return -ENOPROTOOPT; 988 } 989 990 err = p9_fd_open(client, opts.rfd, opts.wfd); 991 if (err < 0) 992 return err; 993 994 p = (struct p9_trans_fd *) client->trans; 995 p->conn = p9_conn_create(client); 996 if (IS_ERR(p->conn)) { 997 err = PTR_ERR(p->conn); 998 p->conn = NULL; 999 fput(p->rd); 1000 fput(p->wr); 1001 return err; 1002 } 1003 1004 return 0; 1005 } 1006 1007 static struct p9_trans_module p9_tcp_trans = { 1008 .name = "tcp", 1009 .maxsize = MAX_SOCK_BUF, 1010 .def = 1, 1011 .create = p9_fd_create_tcp, 1012 .close = p9_fd_close, 1013 .request = p9_fd_request, 1014 .cancel = p9_fd_cancel, 1015 .owner = THIS_MODULE, 1016 }; 1017 1018 static struct p9_trans_module p9_unix_trans = { 1019 .name = "unix", 1020 .maxsize = MAX_SOCK_BUF, 1021 .def = 0, 1022 .create = p9_fd_create_unix, 1023 .close = p9_fd_close, 1024 .request = p9_fd_request, 1025 .cancel = p9_fd_cancel, 1026 .owner = THIS_MODULE, 1027 }; 1028 1029 static struct p9_trans_module p9_fd_trans = { 1030 .name = "fd", 1031 .maxsize = MAX_SOCK_BUF, 1032 .def = 0, 1033 .create = p9_fd_create, 1034 .close = p9_fd_close, 1035 .request = p9_fd_request, 1036 .cancel = p9_fd_cancel, 1037 .owner = THIS_MODULE, 1038 }; 1039 1040 /** 1041 * p9_poll_proc - poll worker thread 1042 * @a: thread state and arguments 1043 * 1044 * polls all v9fs transports for new events and queues the appropriate 1045 * work to the work queue 1046 * 1047 */ 1048 1049 static void p9_poll_workfn(struct work_struct *work) 1050 { 1051 unsigned long flags; 1052 1053 P9_DPRINTK(P9_DEBUG_TRANS, "start %p\n", current); 1054 1055 spin_lock_irqsave(&p9_poll_lock, flags); 1056 while (!list_empty(&p9_poll_pending_list)) { 1057 struct p9_conn *conn = list_first_entry(&p9_poll_pending_list, 1058 struct p9_conn, 1059 poll_pending_link); 1060 list_del_init(&conn->poll_pending_link); 1061 spin_unlock_irqrestore(&p9_poll_lock, flags); 1062 1063 p9_poll_mux(conn); 1064 1065 spin_lock_irqsave(&p9_poll_lock, flags); 1066 } 1067 spin_unlock_irqrestore(&p9_poll_lock, flags); 1068 1069 P9_DPRINTK(P9_DEBUG_TRANS, "finish\n"); 1070 } 1071 1072 int p9_trans_fd_init(void) 1073 { 1074 v9fs_register_trans(&p9_tcp_trans); 1075 v9fs_register_trans(&p9_unix_trans); 1076 v9fs_register_trans(&p9_fd_trans); 1077 1078 return 0; 1079 } 1080 1081 void p9_trans_fd_exit(void) 1082 { 1083 flush_work_sync(&p9_poll_work); 1084 v9fs_unregister_trans(&p9_tcp_trans); 1085 v9fs_unregister_trans(&p9_unix_trans); 1086 v9fs_unregister_trans(&p9_fd_trans); 1087 } 1088