vnd.c revision 1.249
1 /* $NetBSD: vnd.c,v 1.249 2015/11/09 16:52:09 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1996, 1997, 1998, 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1988 University of Utah. 34 * Copyright (c) 1990, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * This code is derived from software contributed to Berkeley by 38 * the Systems Programming Group of the University of Utah Computer 39 * Science Department. 40 * 41 * Redistribution and use in source and binary forms, with or without 42 * modification, are permitted provided that the following conditions 43 * are met: 44 * 1. Redistributions of source code must retain the above copyright 45 * notice, this list of conditions and the following disclaimer. 46 * 2. Redistributions in binary form must reproduce the above copyright 47 * notice, this list of conditions and the following disclaimer in the 48 * documentation and/or other materials provided with the distribution. 49 * 3. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * from: Utah $Hdr: vn.c 1.13 94/04/02$ 66 * 67 * @(#)vn.c 8.9 (Berkeley) 5/14/95 68 */ 69 70 /* 71 * Vnode disk driver. 72 * 73 * Block/character interface to a vnode. Allows one to treat a file 74 * as a disk (e.g. build a filesystem in it, mount it, etc.). 75 * 76 * NOTE 1: If the vnode supports the VOP_BMAP and VOP_STRATEGY operations, 77 * this uses them to avoid distorting the local buffer cache. If those 78 * block-level operations are not available, this falls back to the regular 79 * read and write calls. Using these may distort the cache in some cases 80 * but better have the driver working than preventing it to work on file 81 * systems where the block-level operations are not implemented for 82 * whatever reason. 83 * 84 * NOTE 2: There is a security issue involved with this driver. 85 * Once mounted all access to the contents of the "mapped" file via 86 * the special file is controlled by the permissions on the special 87 * file, the protection of the mapped file is ignored (effectively, 88 * by using root credentials in all transactions). 89 * 90 * NOTE 3: Doesn't interact with leases, should it? 91 */ 92 93 #include <sys/cdefs.h> 94 __KERNEL_RCSID(0, "$NetBSD: vnd.c,v 1.249 2015/11/09 16:52:09 christos Exp $"); 95 96 #if defined(_KERNEL_OPT) 97 #include "opt_vnd.h" 98 #include "opt_compat_netbsd.h" 99 #endif 100 101 #define DEBUG 102 #include <sys/param.h> 103 #include <sys/systm.h> 104 #include <sys/namei.h> 105 #include <sys/proc.h> 106 #include <sys/kthread.h> 107 #include <sys/errno.h> 108 #include <sys/buf.h> 109 #include <sys/bufq.h> 110 #include <sys/malloc.h> 111 #include <sys/ioctl.h> 112 #include <sys/disklabel.h> 113 #include <sys/device.h> 114 #include <sys/disk.h> 115 #include <sys/stat.h> 116 #include <sys/mount.h> 117 #include <sys/vnode.h> 118 #include <sys/file.h> 119 #include <sys/uio.h> 120 #include <sys/conf.h> 121 #include <sys/kauth.h> 122 123 #include <net/zlib.h> 124 125 #include <miscfs/genfs/genfs.h> 126 #include <miscfs/specfs/specdev.h> 127 128 #include <dev/dkvar.h> 129 #include <dev/vndvar.h> 130 131 #include "ioconf.h" 132 133 #if defined(VNDDEBUG) && !defined(DEBUG) 134 #define DEBUG 135 #endif 136 137 #ifdef DEBUG 138 int dovndcluster = 1; 139 #define VDB_FOLLOW 0x01 140 #define VDB_INIT 0x02 141 #define VDB_IO 0x04 142 #define VDB_LABEL 0x08 143 int vnddebug = 0xff; 144 #endif 145 146 #define vndunit(x) DISKUNIT(x) 147 148 struct vndxfer { 149 struct buf vx_buf; 150 struct vnd_softc *vx_vnd; 151 }; 152 #define VND_BUFTOXFER(bp) ((struct vndxfer *)(void *)bp) 153 154 #define VND_GETXFER(vnd) pool_get(&(vnd)->sc_vxpool, PR_WAITOK) 155 #define VND_PUTXFER(vnd, vx) pool_put(&(vnd)->sc_vxpool, (vx)) 156 157 #define VNDLABELDEV(dev) \ 158 (MAKEDISKDEV(major((dev)), vndunit((dev)), RAW_PART)) 159 160 #define VND_MAXPENDING(vnd) ((vnd)->sc_maxactive * 4) 161 162 163 static void vndclear(struct vnd_softc *, int); 164 static int vnddoclear(struct vnd_softc *, int, int, bool); 165 static int vndsetcred(struct vnd_softc *, kauth_cred_t); 166 static void vndthrottle(struct vnd_softc *, struct vnode *); 167 static void vndiodone(struct buf *); 168 #if 0 169 static void vndshutdown(void); 170 #endif 171 172 static void vndgetdefaultlabel(struct vnd_softc *, struct disklabel *); 173 static void vndgetdisklabel(dev_t, struct vnd_softc *); 174 175 static int vndlock(struct vnd_softc *); 176 static void vndunlock(struct vnd_softc *); 177 #ifdef VND_COMPRESSION 178 static void compstrategy(struct buf *, off_t); 179 static void *vnd_alloc(void *, u_int, u_int); 180 static void vnd_free(void *, void *); 181 #endif /* VND_COMPRESSION */ 182 183 static void vndthread(void *); 184 static bool vnode_has_op(const struct vnode *, int); 185 static void handle_with_rdwr(struct vnd_softc *, const struct buf *, 186 struct buf *); 187 static void handle_with_strategy(struct vnd_softc *, const struct buf *, 188 struct buf *); 189 static void vnd_set_geometry(struct vnd_softc *); 190 191 static dev_type_open(vndopen); 192 static dev_type_close(vndclose); 193 static dev_type_read(vndread); 194 static dev_type_write(vndwrite); 195 static dev_type_ioctl(vndioctl); 196 static dev_type_strategy(vndstrategy); 197 static dev_type_dump(vnddump); 198 static dev_type_size(vndsize); 199 200 const struct bdevsw vnd_bdevsw = { 201 .d_open = vndopen, 202 .d_close = vndclose, 203 .d_strategy = vndstrategy, 204 .d_ioctl = vndioctl, 205 .d_dump = vnddump, 206 .d_psize = vndsize, 207 .d_discard = nodiscard, 208 .d_flag = D_DISK 209 }; 210 211 const struct cdevsw vnd_cdevsw = { 212 .d_open = vndopen, 213 .d_close = vndclose, 214 .d_read = vndread, 215 .d_write = vndwrite, 216 .d_ioctl = vndioctl, 217 .d_stop = nostop, 218 .d_tty = notty, 219 .d_poll = nopoll, 220 .d_mmap = nommap, 221 .d_kqfilter = nokqfilter, 222 .d_discard = nodiscard, 223 .d_flag = D_DISK 224 }; 225 226 static int vnd_match(device_t, cfdata_t, void *); 227 static void vnd_attach(device_t, device_t, void *); 228 static int vnd_detach(device_t, int); 229 230 CFATTACH_DECL3_NEW(vnd, sizeof(struct vnd_softc), 231 vnd_match, vnd_attach, vnd_detach, NULL, NULL, NULL, DVF_DETACH_SHUTDOWN); 232 extern struct cfdriver vnd_cd; 233 234 static struct vnd_softc *vnd_spawn(int); 235 int vnd_destroy(device_t); 236 237 static struct dkdriver vnddkdriver = { 238 .d_strategy = vndstrategy, 239 .d_minphys = minphys 240 }; 241 242 void 243 vndattach(int num) 244 { 245 int error; 246 247 error = config_cfattach_attach(vnd_cd.cd_name, &vnd_ca); 248 if (error) 249 aprint_error("%s: unable to register cfattach, error = %d\n", 250 vnd_cd.cd_name, error); 251 } 252 253 static int 254 vnd_match(device_t self, cfdata_t cfdata, void *aux) 255 { 256 257 return 1; 258 } 259 260 static void 261 vnd_attach(device_t parent, device_t self, void *aux) 262 { 263 struct vnd_softc *sc = device_private(self); 264 265 sc->sc_dev = self; 266 sc->sc_comp_offsets = NULL; 267 sc->sc_comp_buff = NULL; 268 sc->sc_comp_decombuf = NULL; 269 bufq_alloc(&sc->sc_tab, "disksort", BUFQ_SORT_RAWBLOCK); 270 disk_init(&sc->sc_dkdev, device_xname(self), &vnddkdriver); 271 if (!pmf_device_register(self, NULL, NULL)) 272 aprint_error_dev(self, "couldn't establish power handler\n"); 273 } 274 275 static int 276 vnd_detach(device_t self, int flags) 277 { 278 int error; 279 struct vnd_softc *sc = device_private(self); 280 281 if (sc->sc_flags & VNF_INITED) { 282 error = vnddoclear(sc, 0, -1, (flags & DETACH_FORCE) != 0); 283 if (error != 0) 284 return error; 285 } 286 287 pmf_device_deregister(self); 288 bufq_free(sc->sc_tab); 289 disk_destroy(&sc->sc_dkdev); 290 291 return 0; 292 } 293 294 static struct vnd_softc * 295 vnd_spawn(int unit) 296 { 297 cfdata_t cf; 298 299 cf = malloc(sizeof(*cf), M_DEVBUF, M_WAITOK); 300 cf->cf_name = vnd_cd.cd_name; 301 cf->cf_atname = vnd_cd.cd_name; 302 cf->cf_unit = unit; 303 cf->cf_fstate = FSTATE_STAR; 304 305 return device_private(config_attach_pseudo(cf)); 306 } 307 308 int 309 vnd_destroy(device_t dev) 310 { 311 int error; 312 cfdata_t cf; 313 314 cf = device_cfdata(dev); 315 error = config_detach(dev, DETACH_QUIET); 316 if (error) 317 return error; 318 free(cf, M_DEVBUF); 319 return 0; 320 } 321 322 static int 323 vndopen(dev_t dev, int flags, int mode, struct lwp *l) 324 { 325 int unit = vndunit(dev); 326 struct vnd_softc *sc; 327 int error = 0, part, pmask; 328 struct disklabel *lp; 329 330 #ifdef DEBUG 331 if (vnddebug & VDB_FOLLOW) 332 printf("vndopen(0x%"PRIx64", 0x%x, 0x%x, %p)\n", dev, flags, mode, l); 333 #endif 334 sc = device_lookup_private(&vnd_cd, unit); 335 if (sc == NULL) { 336 sc = vnd_spawn(unit); 337 if (sc == NULL) 338 return ENOMEM; 339 340 /* compatibility, keep disklabel after close */ 341 sc->sc_flags = VNF_KLABEL; 342 } 343 344 if ((error = vndlock(sc)) != 0) 345 return error; 346 347 mutex_enter(&sc->sc_dkdev.dk_openlock); 348 349 if ((sc->sc_flags & VNF_CLEARING) != 0) { 350 error = ENXIO; 351 goto done; 352 } 353 354 lp = sc->sc_dkdev.dk_label; 355 356 part = DISKPART(dev); 357 pmask = (1 << part); 358 359 if (sc->sc_dkdev.dk_nwedges != 0 && part != RAW_PART) { 360 error = EBUSY; 361 goto done; 362 } 363 364 if (sc->sc_flags & VNF_INITED) { 365 if ((sc->sc_dkdev.dk_openmask & ~(1<<RAW_PART)) != 0) { 366 /* 367 * If any non-raw partition is open, but the disk 368 * has been invalidated, disallow further opens. 369 */ 370 if ((sc->sc_flags & VNF_VLABEL) == 0) { 371 error = EIO; 372 goto done; 373 } 374 } else { 375 /* 376 * Load the partition info if not already loaded. 377 */ 378 if ((sc->sc_flags & VNF_VLABEL) == 0) { 379 sc->sc_flags |= VNF_VLABEL; 380 vndgetdisklabel(dev, sc); 381 } 382 } 383 } 384 385 /* Check that the partitions exists. */ 386 if (part != RAW_PART) { 387 if (((sc->sc_flags & VNF_INITED) == 0) || 388 ((part >= lp->d_npartitions) || 389 (lp->d_partitions[part].p_fstype == FS_UNUSED))) { 390 error = ENXIO; 391 goto done; 392 } 393 } 394 395 /* Prevent our unit from being unconfigured while open. */ 396 switch (mode) { 397 case S_IFCHR: 398 sc->sc_dkdev.dk_copenmask |= pmask; 399 break; 400 401 case S_IFBLK: 402 sc->sc_dkdev.dk_bopenmask |= pmask; 403 break; 404 } 405 sc->sc_dkdev.dk_openmask = 406 sc->sc_dkdev.dk_copenmask | sc->sc_dkdev.dk_bopenmask; 407 408 done: 409 mutex_exit(&sc->sc_dkdev.dk_openlock); 410 vndunlock(sc); 411 return error; 412 } 413 414 static int 415 vndclose(dev_t dev, int flags, int mode, struct lwp *l) 416 { 417 int unit = vndunit(dev); 418 struct vnd_softc *sc; 419 int error = 0, part; 420 421 #ifdef DEBUG 422 if (vnddebug & VDB_FOLLOW) 423 printf("vndclose(0x%"PRIx64", 0x%x, 0x%x, %p)\n", dev, flags, mode, l); 424 #endif 425 sc = device_lookup_private(&vnd_cd, unit); 426 if (sc == NULL) 427 return ENXIO; 428 429 if ((error = vndlock(sc)) != 0) 430 return error; 431 432 mutex_enter(&sc->sc_dkdev.dk_openlock); 433 434 part = DISKPART(dev); 435 436 /* ...that much closer to allowing unconfiguration... */ 437 switch (mode) { 438 case S_IFCHR: 439 sc->sc_dkdev.dk_copenmask &= ~(1 << part); 440 break; 441 442 case S_IFBLK: 443 sc->sc_dkdev.dk_bopenmask &= ~(1 << part); 444 break; 445 } 446 sc->sc_dkdev.dk_openmask = 447 sc->sc_dkdev.dk_copenmask | sc->sc_dkdev.dk_bopenmask; 448 449 /* are we last opener ? */ 450 if (sc->sc_dkdev.dk_openmask == 0) { 451 if ((sc->sc_flags & VNF_KLABEL) == 0) 452 sc->sc_flags &= ~VNF_VLABEL; 453 } 454 455 mutex_exit(&sc->sc_dkdev.dk_openlock); 456 457 vndunlock(sc); 458 459 if ((sc->sc_flags & VNF_INITED) == 0) { 460 if ((error = vnd_destroy(sc->sc_dev)) != 0) { 461 aprint_error_dev(sc->sc_dev, 462 "unable to detach instance\n"); 463 return error; 464 } 465 } 466 467 return 0; 468 } 469 470 /* 471 * Queue the request, and wakeup the kernel thread to handle it. 472 */ 473 static void 474 vndstrategy(struct buf *bp) 475 { 476 int unit = vndunit(bp->b_dev); 477 struct vnd_softc *vnd = 478 device_lookup_private(&vnd_cd, unit); 479 struct disklabel *lp; 480 daddr_t blkno; 481 int s = splbio(); 482 483 if (vnd == NULL) { 484 bp->b_error = ENXIO; 485 goto done; 486 } 487 lp = vnd->sc_dkdev.dk_label; 488 489 if ((vnd->sc_flags & VNF_INITED) == 0) { 490 bp->b_error = ENXIO; 491 goto done; 492 } 493 494 /* 495 * The transfer must be a whole number of blocks. 496 */ 497 if ((bp->b_bcount % lp->d_secsize) != 0) { 498 bp->b_error = EINVAL; 499 goto done; 500 } 501 502 /* 503 * check if we're read-only. 504 */ 505 if ((vnd->sc_flags & VNF_READONLY) && !(bp->b_flags & B_READ)) { 506 bp->b_error = EACCES; 507 goto done; 508 } 509 510 /* If it's a nil transfer, wake up the top half now. */ 511 if (bp->b_bcount == 0) { 512 goto done; 513 } 514 515 /* 516 * Do bounds checking and adjust transfer. If there's an error, 517 * the bounds check will flag that for us. 518 */ 519 if (DISKPART(bp->b_dev) == RAW_PART) { 520 if (bounds_check_with_mediasize(bp, DEV_BSIZE, 521 vnd->sc_size) <= 0) 522 goto done; 523 } else { 524 if (bounds_check_with_label(&vnd->sc_dkdev, 525 bp, vnd->sc_flags & (VNF_WLABEL|VNF_LABELLING)) <= 0) 526 goto done; 527 } 528 529 /* 530 * Put the block number in terms of the logical blocksize 531 * of the "device". 532 */ 533 534 blkno = bp->b_blkno / (lp->d_secsize / DEV_BSIZE); 535 536 /* 537 * Translate the partition-relative block number to an absolute. 538 */ 539 if (DISKPART(bp->b_dev) != RAW_PART) { 540 struct partition *pp; 541 542 pp = &vnd->sc_dkdev.dk_label->d_partitions[ 543 DISKPART(bp->b_dev)]; 544 blkno += pp->p_offset; 545 } 546 bp->b_rawblkno = blkno; 547 548 #ifdef DEBUG 549 if (vnddebug & VDB_FOLLOW) 550 printf("vndstrategy(%p): unit %d\n", bp, unit); 551 #endif 552 if ((vnd->sc_flags & VNF_USE_VN_RDWR)) { 553 KASSERT(vnd->sc_pending >= 0 && 554 vnd->sc_pending <= VND_MAXPENDING(vnd)); 555 while (vnd->sc_pending == VND_MAXPENDING(vnd)) 556 tsleep(&vnd->sc_pending, PRIBIO, "vndpc", 0); 557 vnd->sc_pending++; 558 } 559 bufq_put(vnd->sc_tab, bp); 560 wakeup(&vnd->sc_tab); 561 splx(s); 562 return; 563 564 done: 565 bp->b_resid = bp->b_bcount; 566 biodone(bp); 567 splx(s); 568 } 569 570 static bool 571 vnode_has_strategy(struct vnd_softc *vnd) 572 { 573 return vnode_has_op(vnd->sc_vp, VOFFSET(vop_bmap)) && 574 vnode_has_op(vnd->sc_vp, VOFFSET(vop_strategy)); 575 } 576 577 /* XXX this function needs a reliable check to detect 578 * sparse files. Otherwise, bmap/strategy may be used 579 * and fail on non-allocated blocks. VOP_READ/VOP_WRITE 580 * works on sparse files. 581 */ 582 #if notyet 583 static bool 584 vnode_strategy_probe(struct vnd_softc *vnd) 585 { 586 int error; 587 daddr_t nbn; 588 589 if (!vnode_has_strategy(vnd)) 590 return false; 591 592 /* Convert the first logical block number to its 593 * physical block number. 594 */ 595 error = 0; 596 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 597 error = VOP_BMAP(vnd->sc_vp, 0, NULL, &nbn, NULL); 598 VOP_UNLOCK(vnd->sc_vp); 599 600 /* Test if that worked. */ 601 if (error == 0 && (long)nbn == -1) 602 return false; 603 604 return true; 605 } 606 #endif 607 608 static void 609 vndthread(void *arg) 610 { 611 struct vnd_softc *vnd = arg; 612 int s; 613 614 /* Determine whether we can *use* VOP_BMAP and VOP_STRATEGY to 615 * directly access the backing vnode. If we can, use these two 616 * operations to avoid messing with the local buffer cache. 617 * Otherwise fall back to regular VOP_READ/VOP_WRITE operations 618 * which are guaranteed to work with any file system. */ 619 if ((vnd->sc_flags & VNF_USE_VN_RDWR) == 0 && 620 ! vnode_has_strategy(vnd)) 621 vnd->sc_flags |= VNF_USE_VN_RDWR; 622 623 #ifdef DEBUG 624 if (vnddebug & VDB_INIT) 625 printf("vndthread: vp %p, %s\n", vnd->sc_vp, 626 (vnd->sc_flags & VNF_USE_VN_RDWR) == 0 ? 627 "using bmap/strategy operations" : 628 "using read/write operations"); 629 #endif 630 631 s = splbio(); 632 vnd->sc_flags |= VNF_KTHREAD; 633 wakeup(&vnd->sc_kthread); 634 635 /* 636 * Dequeue requests and serve them depending on the available 637 * vnode operations. 638 */ 639 while ((vnd->sc_flags & VNF_VUNCONF) == 0) { 640 struct vndxfer *vnx; 641 struct buf *obp; 642 struct buf *bp; 643 644 obp = bufq_get(vnd->sc_tab); 645 if (obp == NULL) { 646 tsleep(&vnd->sc_tab, PRIBIO, "vndbp", 0); 647 continue; 648 }; 649 if ((vnd->sc_flags & VNF_USE_VN_RDWR)) { 650 KASSERT(vnd->sc_pending > 0 && 651 vnd->sc_pending <= VND_MAXPENDING(vnd)); 652 if (vnd->sc_pending-- == VND_MAXPENDING(vnd)) 653 wakeup(&vnd->sc_pending); 654 } 655 splx(s); 656 #ifdef DEBUG 657 if (vnddebug & VDB_FOLLOW) 658 printf("vndthread(%p)\n", obp); 659 #endif 660 661 if (vnd->sc_vp->v_mount == NULL) { 662 obp->b_error = ENXIO; 663 goto done; 664 } 665 #ifdef VND_COMPRESSION 666 /* handle a compressed read */ 667 if ((obp->b_flags & B_READ) != 0 && (vnd->sc_flags & VNF_COMP)) { 668 off_t bn; 669 670 /* Convert to a byte offset within the file. */ 671 bn = obp->b_rawblkno * 672 vnd->sc_dkdev.dk_label->d_secsize; 673 674 compstrategy(obp, bn); 675 goto done; 676 } 677 #endif /* VND_COMPRESSION */ 678 679 /* 680 * Allocate a header for this transfer and link it to the 681 * buffer 682 */ 683 s = splbio(); 684 vnx = VND_GETXFER(vnd); 685 splx(s); 686 vnx->vx_vnd = vnd; 687 688 s = splbio(); 689 while (vnd->sc_active >= vnd->sc_maxactive) { 690 tsleep(&vnd->sc_tab, PRIBIO, "vndac", 0); 691 } 692 vnd->sc_active++; 693 splx(s); 694 695 /* Instrumentation. */ 696 disk_busy(&vnd->sc_dkdev); 697 698 bp = &vnx->vx_buf; 699 buf_init(bp); 700 bp->b_flags = (obp->b_flags & B_READ); 701 bp->b_oflags = obp->b_oflags; 702 bp->b_cflags = obp->b_cflags; 703 bp->b_iodone = vndiodone; 704 bp->b_private = obp; 705 bp->b_vp = vnd->sc_vp; 706 bp->b_objlock = bp->b_vp->v_interlock; 707 bp->b_data = obp->b_data; 708 bp->b_bcount = obp->b_bcount; 709 BIO_COPYPRIO(bp, obp); 710 711 /* Handle the request using the appropriate operations. */ 712 if ((vnd->sc_flags & VNF_USE_VN_RDWR) == 0) 713 handle_with_strategy(vnd, obp, bp); 714 else 715 handle_with_rdwr(vnd, obp, bp); 716 717 s = splbio(); 718 continue; 719 720 done: 721 biodone(obp); 722 s = splbio(); 723 } 724 725 vnd->sc_flags &= (~VNF_KTHREAD | VNF_VUNCONF); 726 wakeup(&vnd->sc_kthread); 727 splx(s); 728 kthread_exit(0); 729 } 730 731 /* 732 * Checks if the given vnode supports the requested operation. 733 * The operation is specified the offset returned by VOFFSET. 734 * 735 * XXX The test below used to determine this is quite fragile 736 * because it relies on the file system to use genfs to specify 737 * unimplemented operations. There might be another way to do 738 * it more cleanly. 739 */ 740 static bool 741 vnode_has_op(const struct vnode *vp, int opoffset) 742 { 743 int (*defaultp)(void *); 744 int (*opp)(void *); 745 746 defaultp = vp->v_op[VOFFSET(vop_default)]; 747 opp = vp->v_op[opoffset]; 748 749 return opp != defaultp && opp != genfs_eopnotsupp && 750 opp != genfs_badop && opp != genfs_nullop; 751 } 752 753 /* 754 * Handles the read/write request given in 'bp' using the vnode's VOP_READ 755 * and VOP_WRITE operations. 756 * 757 * 'obp' is a pointer to the original request fed to the vnd device. 758 */ 759 static void 760 handle_with_rdwr(struct vnd_softc *vnd, const struct buf *obp, struct buf *bp) 761 { 762 bool doread; 763 off_t offset; 764 size_t len, resid; 765 struct vnode *vp; 766 767 doread = bp->b_flags & B_READ; 768 offset = obp->b_rawblkno * vnd->sc_dkdev.dk_label->d_secsize; 769 len = bp->b_bcount; 770 vp = vnd->sc_vp; 771 772 #if defined(DEBUG) 773 if (vnddebug & VDB_IO) 774 printf("vnd (rdwr): vp %p, %s, rawblkno 0x%" PRIx64 775 ", secsize %d, offset %" PRIu64 776 ", bcount %d\n", 777 vp, doread ? "read" : "write", obp->b_rawblkno, 778 vnd->sc_dkdev.dk_label->d_secsize, offset, 779 bp->b_bcount); 780 #endif 781 782 /* Issue the read or write operation. */ 783 bp->b_error = 784 vn_rdwr(doread ? UIO_READ : UIO_WRITE, 785 vp, bp->b_data, len, offset, UIO_SYSSPACE, 786 IO_ADV_ENCODE(POSIX_FADV_NOREUSE), vnd->sc_cred, &resid, NULL); 787 bp->b_resid = resid; 788 789 mutex_enter(vp->v_interlock); 790 (void) VOP_PUTPAGES(vp, 0, 0, 791 PGO_ALLPAGES | PGO_CLEANIT | PGO_FREE | PGO_SYNCIO); 792 793 /* We need to increase the number of outputs on the vnode if 794 * there was any write to it. */ 795 if (!doread) { 796 mutex_enter(vp->v_interlock); 797 vp->v_numoutput++; 798 mutex_exit(vp->v_interlock); 799 } 800 801 biodone(bp); 802 } 803 804 /* 805 * Handes the read/write request given in 'bp' using the vnode's VOP_BMAP 806 * and VOP_STRATEGY operations. 807 * 808 * 'obp' is a pointer to the original request fed to the vnd device. 809 */ 810 static void 811 handle_with_strategy(struct vnd_softc *vnd, const struct buf *obp, 812 struct buf *bp) 813 { 814 int bsize, error, flags, skipped; 815 size_t resid, sz; 816 off_t bn, offset; 817 struct vnode *vp; 818 struct buf *nbp = NULL; 819 820 flags = obp->b_flags; 821 822 823 /* convert to a byte offset within the file. */ 824 bn = obp->b_rawblkno * vnd->sc_dkdev.dk_label->d_secsize; 825 826 bsize = vnd->sc_vp->v_mount->mnt_stat.f_iosize; 827 skipped = 0; 828 829 /* 830 * Break the request into bsize pieces and feed them 831 * sequentially using VOP_BMAP/VOP_STRATEGY. 832 * We do it this way to keep from flooding NFS servers if we 833 * are connected to an NFS file. This places the burden on 834 * the client rather than the server. 835 */ 836 error = 0; 837 bp->b_resid = bp->b_bcount; 838 for (offset = 0, resid = bp->b_resid; /* true */; 839 resid -= sz, offset += sz) { 840 daddr_t nbn; 841 int off, nra; 842 843 nra = 0; 844 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 845 error = VOP_BMAP(vnd->sc_vp, bn / bsize, &vp, &nbn, &nra); 846 VOP_UNLOCK(vnd->sc_vp); 847 848 if (error == 0 && (long)nbn == -1) 849 error = EIO; 850 851 /* 852 * If there was an error or a hole in the file...punt. 853 * Note that we may have to wait for any operations 854 * that we have already fired off before releasing 855 * the buffer. 856 * 857 * XXX we could deal with holes here but it would be 858 * a hassle (in the write case). 859 */ 860 if (error) { 861 skipped += resid; 862 break; 863 } 864 865 #ifdef DEBUG 866 if (!dovndcluster) 867 nra = 0; 868 #endif 869 870 off = bn % bsize; 871 sz = MIN(((off_t)1 + nra) * bsize - off, resid); 872 #ifdef DEBUG 873 if (vnddebug & VDB_IO) 874 printf("vndstrategy: vp %p/%p bn 0x%qx/0x%" PRIx64 875 " sz 0x%zx\n", vnd->sc_vp, vp, (long long)bn, 876 nbn, sz); 877 #endif 878 879 nbp = getiobuf(vp, true); 880 nestiobuf_setup(bp, nbp, offset, sz); 881 nbp->b_blkno = nbn + btodb(off); 882 883 #if 0 /* XXX #ifdef DEBUG */ 884 if (vnddebug & VDB_IO) 885 printf("vndstart(%ld): bp %p vp %p blkno " 886 "0x%" PRIx64 " flags %x addr %p cnt 0x%x\n", 887 (long) (vnd-vnd_softc), &nbp->vb_buf, 888 nbp->vb_buf.b_vp, nbp->vb_buf.b_blkno, 889 nbp->vb_buf.b_flags, nbp->vb_buf.b_data, 890 nbp->vb_buf.b_bcount); 891 #endif 892 if (resid == sz) { 893 break; 894 } 895 VOP_STRATEGY(vp, nbp); 896 bn += sz; 897 } 898 if (!(flags & B_READ)) { 899 struct vnode *w_vp; 900 /* 901 * this is the last nested buf, account for 902 * the parent buf write too. 903 * This has to be done last, so that 904 * fsync won't wait for this write which 905 * has no chance to complete before all nested bufs 906 * have been queued. But it has to be done 907 * before the last VOP_STRATEGY() 908 * or the call to nestiobuf_done(). 909 */ 910 w_vp = bp->b_vp; 911 mutex_enter(w_vp->v_interlock); 912 w_vp->v_numoutput++; 913 mutex_exit(w_vp->v_interlock); 914 } 915 KASSERT(skipped != 0 || nbp != NULL); 916 if (skipped) 917 nestiobuf_done(bp, skipped, error); 918 else 919 VOP_STRATEGY(vp, nbp); 920 } 921 922 static void 923 vndiodone(struct buf *bp) 924 { 925 struct vndxfer *vnx = VND_BUFTOXFER(bp); 926 struct vnd_softc *vnd = vnx->vx_vnd; 927 struct buf *obp = bp->b_private; 928 int s = splbio(); 929 930 KASSERT(&vnx->vx_buf == bp); 931 KASSERT(vnd->sc_active > 0); 932 #ifdef DEBUG 933 if (vnddebug & VDB_IO) { 934 printf("vndiodone1: bp %p iodone: error %d\n", 935 bp, bp->b_error); 936 } 937 #endif 938 disk_unbusy(&vnd->sc_dkdev, bp->b_bcount - bp->b_resid, 939 (bp->b_flags & B_READ)); 940 vnd->sc_active--; 941 if (vnd->sc_active == 0) { 942 wakeup(&vnd->sc_tab); 943 } 944 splx(s); 945 obp->b_error = bp->b_error; 946 obp->b_resid = bp->b_resid; 947 buf_destroy(bp); 948 VND_PUTXFER(vnd, vnx); 949 biodone(obp); 950 } 951 952 /* ARGSUSED */ 953 static int 954 vndread(dev_t dev, struct uio *uio, int flags) 955 { 956 int unit = vndunit(dev); 957 struct vnd_softc *sc; 958 959 #ifdef DEBUG 960 if (vnddebug & VDB_FOLLOW) 961 printf("vndread(0x%"PRIx64", %p)\n", dev, uio); 962 #endif 963 964 sc = device_lookup_private(&vnd_cd, unit); 965 if (sc == NULL) 966 return ENXIO; 967 968 if ((sc->sc_flags & VNF_INITED) == 0) 969 return ENXIO; 970 971 return physio(vndstrategy, NULL, dev, B_READ, minphys, uio); 972 } 973 974 /* ARGSUSED */ 975 static int 976 vndwrite(dev_t dev, struct uio *uio, int flags) 977 { 978 int unit = vndunit(dev); 979 struct vnd_softc *sc; 980 981 #ifdef DEBUG 982 if (vnddebug & VDB_FOLLOW) 983 printf("vndwrite(0x%"PRIx64", %p)\n", dev, uio); 984 #endif 985 986 sc = device_lookup_private(&vnd_cd, unit); 987 if (sc == NULL) 988 return ENXIO; 989 990 if ((sc->sc_flags & VNF_INITED) == 0) 991 return ENXIO; 992 993 return physio(vndstrategy, NULL, dev, B_WRITE, minphys, uio); 994 } 995 996 static int 997 vnd_cget(struct lwp *l, int unit, int *un, struct vattr *va) 998 { 999 int error; 1000 struct vnd_softc *vnd; 1001 1002 if (*un == -1) 1003 *un = unit; 1004 if (*un < 0) 1005 return EINVAL; 1006 1007 vnd = device_lookup_private(&vnd_cd, *un); 1008 if (vnd == NULL) 1009 return -1; 1010 1011 if ((vnd->sc_flags & VNF_INITED) == 0) 1012 return -1; 1013 1014 vn_lock(vnd->sc_vp, LK_SHARED | LK_RETRY); 1015 error = VOP_GETATTR(vnd->sc_vp, va, l->l_cred); 1016 VOP_UNLOCK(vnd->sc_vp); 1017 return error; 1018 } 1019 1020 static int 1021 vnddoclear(struct vnd_softc *vnd, int pmask, int minor, bool force) 1022 { 1023 int error; 1024 1025 if ((error = vndlock(vnd)) != 0) 1026 return error; 1027 1028 /* 1029 * Don't unconfigure if any other partitions are open 1030 * or if both the character and block flavors of this 1031 * partition are open. 1032 */ 1033 if (DK_BUSY(vnd, pmask) && !force) { 1034 vndunlock(vnd); 1035 return EBUSY; 1036 } 1037 1038 /* Delete all of our wedges */ 1039 dkwedge_delall(&vnd->sc_dkdev); 1040 1041 /* 1042 * XXX vndclear() might call vndclose() implicitly; 1043 * release lock to avoid recursion 1044 * 1045 * Set VNF_CLEARING to prevent vndopen() from 1046 * sneaking in after we vndunlock(). 1047 */ 1048 vnd->sc_flags |= VNF_CLEARING; 1049 vndunlock(vnd); 1050 vndclear(vnd, minor); 1051 #ifdef DEBUG 1052 if (vnddebug & VDB_INIT) 1053 printf("%s: CLRed\n", __func__); 1054 #endif 1055 1056 /* Destroy the xfer and buffer pools. */ 1057 pool_destroy(&vnd->sc_vxpool); 1058 1059 /* Detach the disk. */ 1060 disk_detach(&vnd->sc_dkdev); 1061 1062 return 0; 1063 } 1064 1065 static int 1066 vndioctl_get(struct lwp *l, void *data, int unit, struct vattr *va) 1067 { 1068 int error; 1069 1070 KASSERT(l); 1071 #ifdef notyet 1072 /* Current userland code does not handle this */ 1073 if (*(int *)data >= vnd_cd.cd_ndevs) 1074 return ENXIO; 1075 #endif 1076 1077 switch (error = vnd_cget(l, unit, (int *)data, va)) { 1078 case -1: 1079 /* unused is not an error */ 1080 memset(&va, 0, sizeof(va)); 1081 /*FALLTHROUGH*/ 1082 case 0: 1083 return 0; 1084 default: 1085 return error; 1086 } 1087 } 1088 1089 /* ARGSUSED */ 1090 static int 1091 vndioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 1092 { 1093 bool force; 1094 int unit = vndunit(dev); 1095 struct vnd_softc *vnd; 1096 struct vnd_ioctl *vio; 1097 struct vattr vattr; 1098 struct pathbuf *pb; 1099 struct nameidata nd; 1100 int error, part, pmask; 1101 uint64_t geomsize; 1102 int fflags; 1103 #ifdef __HAVE_OLD_DISKLABEL 1104 struct disklabel newlabel; 1105 #endif 1106 1107 #ifdef DEBUG 1108 if (vnddebug & VDB_FOLLOW) 1109 printf("vndioctl(0x%"PRIx64", 0x%lx, %p, 0x%x, %p): unit %d\n", 1110 dev, cmd, data, flag, l->l_proc, unit); 1111 #endif 1112 /* Do the get's first; they don't need initialization or verification */ 1113 switch (cmd) { 1114 #ifdef COMPAT_30 1115 case VNDIOCGET30: { 1116 if ((error = vndioctl_get(l, data, unit, &vattr)) != 0) 1117 return error; 1118 1119 struct vnd_user30 *vnu = data; 1120 vnu->vnu_dev = vattr.va_fsid; 1121 vnu->vnu_ino = vattr.va_fileid; 1122 return 0; 1123 } 1124 #endif 1125 #ifdef COMPAT_50 1126 case VNDIOCGET50: { 1127 if ((error = vndioctl_get(l, data, unit, &vattr)) != 0) 1128 return error; 1129 1130 struct vnd_user50 *vnu = data; 1131 vnu->vnu_dev = vattr.va_fsid; 1132 vnu->vnu_ino = vattr.va_fileid; 1133 return 0; 1134 } 1135 #endif 1136 1137 case VNDIOCGET: { 1138 if ((error = vndioctl_get(l, data, unit, &vattr)) != 0) 1139 return error; 1140 1141 struct vnd_user *vnu = data; 1142 vnu->vnu_dev = vattr.va_fsid; 1143 vnu->vnu_ino = vattr.va_fileid; 1144 return 0; 1145 } 1146 default: 1147 break; 1148 } 1149 1150 vnd = device_lookup_private(&vnd_cd, unit); 1151 if (vnd == NULL) 1152 return ENXIO; 1153 vio = (struct vnd_ioctl *)data; 1154 1155 /* Must be open for writes for these commands... */ 1156 switch (cmd) { 1157 case VNDIOCSET: 1158 case VNDIOCCLR: 1159 #ifdef COMPAT_50 1160 case VNDIOCSET50: 1161 case VNDIOCCLR50: 1162 #endif 1163 case DIOCSDINFO: 1164 case DIOCWDINFO: 1165 #ifdef __HAVE_OLD_DISKLABEL 1166 case ODIOCSDINFO: 1167 case ODIOCWDINFO: 1168 #endif 1169 case DIOCKLABEL: 1170 case DIOCWLABEL: 1171 if ((flag & FWRITE) == 0) 1172 return EBADF; 1173 } 1174 1175 /* Must be initialized for these... */ 1176 switch (cmd) { 1177 case VNDIOCCLR: 1178 #ifdef VNDIOCCLR50 1179 case VNDIOCCLR50: 1180 #endif 1181 case DIOCGDINFO: 1182 case DIOCSDINFO: 1183 case DIOCWDINFO: 1184 case DIOCGPART: 1185 case DIOCKLABEL: 1186 case DIOCWLABEL: 1187 case DIOCGDEFLABEL: 1188 case DIOCCACHESYNC: 1189 #ifdef __HAVE_OLD_DISKLABEL 1190 case ODIOCGDINFO: 1191 case ODIOCSDINFO: 1192 case ODIOCWDINFO: 1193 case ODIOCGDEFLABEL: 1194 #endif 1195 if ((vnd->sc_flags & VNF_INITED) == 0) 1196 return ENXIO; 1197 } 1198 1199 error = disk_ioctl(&vnd->sc_dkdev, dev, cmd, data, flag, l); 1200 if (error != EPASSTHROUGH) 1201 return error; 1202 1203 1204 switch (cmd) { 1205 #ifdef VNDIOCSET50 1206 case VNDIOCSET50: 1207 #endif 1208 case VNDIOCSET: 1209 if (vnd->sc_flags & VNF_INITED) 1210 return EBUSY; 1211 1212 if ((error = vndlock(vnd)) != 0) 1213 return error; 1214 1215 fflags = FREAD; 1216 if ((vio->vnd_flags & VNDIOF_READONLY) == 0) 1217 fflags |= FWRITE; 1218 error = pathbuf_copyin(vio->vnd_file, &pb); 1219 if (error) { 1220 goto unlock_and_exit; 1221 } 1222 NDINIT(&nd, LOOKUP, FOLLOW, pb); 1223 if ((error = vn_open(&nd, fflags, 0)) != 0) { 1224 pathbuf_destroy(pb); 1225 goto unlock_and_exit; 1226 } 1227 KASSERT(l); 1228 error = VOP_GETATTR(nd.ni_vp, &vattr, l->l_cred); 1229 if (!error && nd.ni_vp->v_type != VREG) 1230 error = EOPNOTSUPP; 1231 if (!error && vattr.va_bytes < vattr.va_size) 1232 /* File is definitely sparse, use vn_rdwr() */ 1233 vnd->sc_flags |= VNF_USE_VN_RDWR; 1234 if (error) { 1235 VOP_UNLOCK(nd.ni_vp); 1236 goto close_and_exit; 1237 } 1238 1239 /* If using a compressed file, initialize its info */ 1240 /* (or abort with an error if kernel has no compression) */ 1241 if (vio->vnd_flags & VNF_COMP) { 1242 #ifdef VND_COMPRESSION 1243 struct vnd_comp_header *ch; 1244 int i; 1245 u_int32_t comp_size; 1246 u_int32_t comp_maxsize; 1247 1248 /* allocate space for compresed file header */ 1249 ch = malloc(sizeof(struct vnd_comp_header), 1250 M_TEMP, M_WAITOK); 1251 1252 /* read compressed file header */ 1253 error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)ch, 1254 sizeof(struct vnd_comp_header), 0, UIO_SYSSPACE, 1255 IO_UNIT|IO_NODELOCKED, l->l_cred, NULL, NULL); 1256 if (error) { 1257 free(ch, M_TEMP); 1258 VOP_UNLOCK(nd.ni_vp); 1259 goto close_and_exit; 1260 } 1261 1262 /* save some header info */ 1263 vnd->sc_comp_blksz = ntohl(ch->block_size); 1264 /* note last offset is the file byte size */ 1265 vnd->sc_comp_numoffs = ntohl(ch->num_blocks)+1; 1266 free(ch, M_TEMP); 1267 if (vnd->sc_comp_blksz == 0 || 1268 vnd->sc_comp_blksz % DEV_BSIZE !=0) { 1269 VOP_UNLOCK(nd.ni_vp); 1270 error = EINVAL; 1271 goto close_and_exit; 1272 } 1273 if (sizeof(struct vnd_comp_header) + 1274 sizeof(u_int64_t) * vnd->sc_comp_numoffs > 1275 vattr.va_size) { 1276 VOP_UNLOCK(nd.ni_vp); 1277 error = EINVAL; 1278 goto close_and_exit; 1279 } 1280 1281 /* set decompressed file size */ 1282 vattr.va_size = 1283 ((u_quad_t)vnd->sc_comp_numoffs - 1) * 1284 (u_quad_t)vnd->sc_comp_blksz; 1285 1286 /* allocate space for all the compressed offsets */ 1287 vnd->sc_comp_offsets = 1288 malloc(sizeof(u_int64_t) * vnd->sc_comp_numoffs, 1289 M_DEVBUF, M_WAITOK); 1290 1291 /* read in the offsets */ 1292 error = vn_rdwr(UIO_READ, nd.ni_vp, 1293 (void *)vnd->sc_comp_offsets, 1294 sizeof(u_int64_t) * vnd->sc_comp_numoffs, 1295 sizeof(struct vnd_comp_header), UIO_SYSSPACE, 1296 IO_UNIT|IO_NODELOCKED, l->l_cred, NULL, NULL); 1297 if (error) { 1298 VOP_UNLOCK(nd.ni_vp); 1299 goto close_and_exit; 1300 } 1301 /* 1302 * find largest block size (used for allocation limit). 1303 * Also convert offset to native byte order. 1304 */ 1305 comp_maxsize = 0; 1306 for (i = 0; i < vnd->sc_comp_numoffs - 1; i++) { 1307 vnd->sc_comp_offsets[i] = 1308 be64toh(vnd->sc_comp_offsets[i]); 1309 comp_size = be64toh(vnd->sc_comp_offsets[i + 1]) 1310 - vnd->sc_comp_offsets[i]; 1311 if (comp_size > comp_maxsize) 1312 comp_maxsize = comp_size; 1313 } 1314 vnd->sc_comp_offsets[vnd->sc_comp_numoffs - 1] = 1315 be64toh(vnd->sc_comp_offsets[vnd->sc_comp_numoffs - 1]); 1316 1317 /* create compressed data buffer */ 1318 vnd->sc_comp_buff = malloc(comp_maxsize, 1319 M_DEVBUF, M_WAITOK); 1320 1321 /* create decompressed buffer */ 1322 vnd->sc_comp_decombuf = malloc(vnd->sc_comp_blksz, 1323 M_DEVBUF, M_WAITOK); 1324 vnd->sc_comp_buffblk = -1; 1325 1326 /* Initialize decompress stream */ 1327 memset(&vnd->sc_comp_stream, 0, sizeof(z_stream)); 1328 vnd->sc_comp_stream.zalloc = vnd_alloc; 1329 vnd->sc_comp_stream.zfree = vnd_free; 1330 error = inflateInit2(&vnd->sc_comp_stream, MAX_WBITS); 1331 if (error) { 1332 if (vnd->sc_comp_stream.msg) 1333 printf("vnd%d: compressed file, %s\n", 1334 unit, vnd->sc_comp_stream.msg); 1335 VOP_UNLOCK(nd.ni_vp); 1336 error = EINVAL; 1337 goto close_and_exit; 1338 } 1339 1340 vnd->sc_flags |= VNF_COMP | VNF_READONLY; 1341 #else /* !VND_COMPRESSION */ 1342 VOP_UNLOCK(nd.ni_vp); 1343 error = EOPNOTSUPP; 1344 goto close_and_exit; 1345 #endif /* VND_COMPRESSION */ 1346 } 1347 1348 VOP_UNLOCK(nd.ni_vp); 1349 vnd->sc_vp = nd.ni_vp; 1350 vnd->sc_size = btodb(vattr.va_size); /* note truncation */ 1351 1352 /* 1353 * Use pseudo-geometry specified. If none was provided, 1354 * use "standard" Adaptec fictitious geometry. 1355 */ 1356 if (vio->vnd_flags & VNDIOF_HASGEOM) { 1357 1358 memcpy(&vnd->sc_geom, &vio->vnd_geom, 1359 sizeof(vio->vnd_geom)); 1360 1361 /* 1362 * Sanity-check the sector size. 1363 * XXX Don't allow secsize < DEV_BSIZE. Should 1364 * XXX we? 1365 */ 1366 if (vnd->sc_geom.vng_secsize < DEV_BSIZE || 1367 (vnd->sc_geom.vng_secsize % DEV_BSIZE) != 0 || 1368 vnd->sc_geom.vng_ncylinders == 0 || 1369 (vnd->sc_geom.vng_ntracks * 1370 vnd->sc_geom.vng_nsectors) == 0) { 1371 error = EINVAL; 1372 goto close_and_exit; 1373 } 1374 1375 /* 1376 * Compute the size (in DEV_BSIZE blocks) specified 1377 * by the geometry. 1378 */ 1379 geomsize = (int64_t)vnd->sc_geom.vng_nsectors * 1380 vnd->sc_geom.vng_ntracks * 1381 vnd->sc_geom.vng_ncylinders * 1382 (vnd->sc_geom.vng_secsize / DEV_BSIZE); 1383 1384 /* 1385 * Sanity-check the size against the specified 1386 * geometry. 1387 */ 1388 if (vnd->sc_size < geomsize) { 1389 error = EINVAL; 1390 goto close_and_exit; 1391 } 1392 } else if (vnd->sc_size >= (32 * 64)) { 1393 /* 1394 * Size must be at least 2048 DEV_BSIZE blocks 1395 * (1M) in order to use this geometry. 1396 */ 1397 vnd->sc_geom.vng_secsize = DEV_BSIZE; 1398 vnd->sc_geom.vng_nsectors = 32; 1399 vnd->sc_geom.vng_ntracks = 64; 1400 vnd->sc_geom.vng_ncylinders = vnd->sc_size / (64 * 32); 1401 } else { 1402 vnd->sc_geom.vng_secsize = DEV_BSIZE; 1403 vnd->sc_geom.vng_nsectors = 1; 1404 vnd->sc_geom.vng_ntracks = 1; 1405 vnd->sc_geom.vng_ncylinders = vnd->sc_size; 1406 } 1407 1408 vnd_set_geometry(vnd); 1409 1410 if (vio->vnd_flags & VNDIOF_READONLY) { 1411 vnd->sc_flags |= VNF_READONLY; 1412 } 1413 1414 if ((error = vndsetcred(vnd, l->l_cred)) != 0) 1415 goto close_and_exit; 1416 1417 vndthrottle(vnd, vnd->sc_vp); 1418 vio->vnd_osize = dbtob(vnd->sc_size); 1419 #ifdef VNDIOCSET50 1420 if (cmd != VNDIOCSET50) 1421 #endif 1422 vio->vnd_size = dbtob(vnd->sc_size); 1423 vnd->sc_flags |= VNF_INITED; 1424 1425 /* create the kernel thread, wait for it to be up */ 1426 error = kthread_create(PRI_NONE, 0, NULL, vndthread, vnd, 1427 &vnd->sc_kthread, "%s", device_xname(vnd->sc_dev)); 1428 if (error) 1429 goto close_and_exit; 1430 while ((vnd->sc_flags & VNF_KTHREAD) == 0) { 1431 tsleep(&vnd->sc_kthread, PRIBIO, "vndthr", 0); 1432 } 1433 #ifdef DEBUG 1434 if (vnddebug & VDB_INIT) 1435 printf("vndioctl: SET vp %p size 0x%lx %d/%d/%d/%d\n", 1436 vnd->sc_vp, (unsigned long) vnd->sc_size, 1437 vnd->sc_geom.vng_secsize, 1438 vnd->sc_geom.vng_nsectors, 1439 vnd->sc_geom.vng_ntracks, 1440 vnd->sc_geom.vng_ncylinders); 1441 #endif 1442 1443 /* Attach the disk. */ 1444 disk_attach(&vnd->sc_dkdev); 1445 1446 /* Initialize the xfer and buffer pools. */ 1447 pool_init(&vnd->sc_vxpool, sizeof(struct vndxfer), 0, 1448 0, 0, "vndxpl", NULL, IPL_BIO); 1449 1450 vndunlock(vnd); 1451 1452 pathbuf_destroy(pb); 1453 1454 /* Discover wedges on this disk */ 1455 dkwedge_discover(&vnd->sc_dkdev); 1456 1457 break; 1458 1459 close_and_exit: 1460 (void) vn_close(nd.ni_vp, fflags, l->l_cred); 1461 pathbuf_destroy(pb); 1462 unlock_and_exit: 1463 #ifdef VND_COMPRESSION 1464 /* free any allocated memory (for compressed file) */ 1465 if (vnd->sc_comp_offsets) { 1466 free(vnd->sc_comp_offsets, M_DEVBUF); 1467 vnd->sc_comp_offsets = NULL; 1468 } 1469 if (vnd->sc_comp_buff) { 1470 free(vnd->sc_comp_buff, M_DEVBUF); 1471 vnd->sc_comp_buff = NULL; 1472 } 1473 if (vnd->sc_comp_decombuf) { 1474 free(vnd->sc_comp_decombuf, M_DEVBUF); 1475 vnd->sc_comp_decombuf = NULL; 1476 } 1477 #endif /* VND_COMPRESSION */ 1478 vndunlock(vnd); 1479 return error; 1480 1481 #ifdef VNDIOCCLR50 1482 case VNDIOCCLR50: 1483 #endif 1484 case VNDIOCCLR: 1485 part = DISKPART(dev); 1486 pmask = (1 << part); 1487 force = (vio->vnd_flags & VNDIOF_FORCE) != 0; 1488 1489 if ((error = vnddoclear(vnd, pmask, minor(dev), force)) != 0) 1490 return error; 1491 1492 break; 1493 1494 1495 case DIOCWDINFO: 1496 case DIOCSDINFO: 1497 #ifdef __HAVE_OLD_DISKLABEL 1498 case ODIOCWDINFO: 1499 case ODIOCSDINFO: 1500 #endif 1501 { 1502 struct disklabel *lp; 1503 1504 if ((error = vndlock(vnd)) != 0) 1505 return error; 1506 1507 vnd->sc_flags |= VNF_LABELLING; 1508 1509 #ifdef __HAVE_OLD_DISKLABEL 1510 if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) { 1511 memset(&newlabel, 0, sizeof newlabel); 1512 memcpy(&newlabel, data, sizeof (struct olddisklabel)); 1513 lp = &newlabel; 1514 } else 1515 #endif 1516 lp = (struct disklabel *)data; 1517 1518 error = setdisklabel(vnd->sc_dkdev.dk_label, 1519 lp, 0, vnd->sc_dkdev.dk_cpulabel); 1520 if (error == 0) { 1521 if (cmd == DIOCWDINFO 1522 #ifdef __HAVE_OLD_DISKLABEL 1523 || cmd == ODIOCWDINFO 1524 #endif 1525 ) 1526 error = writedisklabel(VNDLABELDEV(dev), 1527 vndstrategy, vnd->sc_dkdev.dk_label, 1528 vnd->sc_dkdev.dk_cpulabel); 1529 } 1530 1531 vnd->sc_flags &= ~VNF_LABELLING; 1532 1533 vndunlock(vnd); 1534 1535 if (error) 1536 return error; 1537 break; 1538 } 1539 1540 case DIOCKLABEL: 1541 if (*(int *)data != 0) 1542 vnd->sc_flags |= VNF_KLABEL; 1543 else 1544 vnd->sc_flags &= ~VNF_KLABEL; 1545 break; 1546 1547 case DIOCWLABEL: 1548 if (*(int *)data != 0) 1549 vnd->sc_flags |= VNF_WLABEL; 1550 else 1551 vnd->sc_flags &= ~VNF_WLABEL; 1552 break; 1553 1554 case DIOCGDEFLABEL: 1555 vndgetdefaultlabel(vnd, (struct disklabel *)data); 1556 break; 1557 1558 #ifdef __HAVE_OLD_DISKLABEL 1559 case ODIOCGDEFLABEL: 1560 vndgetdefaultlabel(vnd, &newlabel); 1561 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 1562 return ENOTTY; 1563 memcpy(data, &newlabel, sizeof (struct olddisklabel)); 1564 break; 1565 #endif 1566 1567 case DIOCCACHESYNC: 1568 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 1569 error = VOP_FSYNC(vnd->sc_vp, vnd->sc_cred, 1570 FSYNC_WAIT | FSYNC_DATAONLY | FSYNC_CACHE, 0, 0); 1571 VOP_UNLOCK(vnd->sc_vp); 1572 return error; 1573 1574 default: 1575 return ENOTTY; 1576 } 1577 1578 return 0; 1579 } 1580 1581 /* 1582 * Duplicate the current processes' credentials. Since we are called only 1583 * as the result of a SET ioctl and only root can do that, any future access 1584 * to this "disk" is essentially as root. Note that credentials may change 1585 * if some other uid can write directly to the mapped file (NFS). 1586 */ 1587 static int 1588 vndsetcred(struct vnd_softc *vnd, kauth_cred_t cred) 1589 { 1590 struct uio auio; 1591 struct iovec aiov; 1592 char *tmpbuf; 1593 int error; 1594 1595 vnd->sc_cred = kauth_cred_dup(cred); 1596 tmpbuf = malloc(DEV_BSIZE, M_TEMP, M_WAITOK); 1597 1598 /* XXX: Horrible kludge to establish credentials for NFS */ 1599 aiov.iov_base = tmpbuf; 1600 aiov.iov_len = min(DEV_BSIZE, dbtob(vnd->sc_size)); 1601 auio.uio_iov = &aiov; 1602 auio.uio_iovcnt = 1; 1603 auio.uio_offset = 0; 1604 auio.uio_rw = UIO_READ; 1605 auio.uio_resid = aiov.iov_len; 1606 UIO_SETUP_SYSSPACE(&auio); 1607 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 1608 error = VOP_READ(vnd->sc_vp, &auio, 0, vnd->sc_cred); 1609 if (error == 0) { 1610 /* 1611 * Because vnd does all IO directly through the vnode 1612 * we need to flush (at least) the buffer from the above 1613 * VOP_READ from the buffer cache to prevent cache 1614 * incoherencies. Also, be careful to write dirty 1615 * buffers back to stable storage. 1616 */ 1617 error = vinvalbuf(vnd->sc_vp, V_SAVE, vnd->sc_cred, 1618 curlwp, 0, 0); 1619 } 1620 VOP_UNLOCK(vnd->sc_vp); 1621 1622 free(tmpbuf, M_TEMP); 1623 return error; 1624 } 1625 1626 /* 1627 * Set maxactive based on FS type 1628 */ 1629 static void 1630 vndthrottle(struct vnd_softc *vnd, struct vnode *vp) 1631 { 1632 1633 if (vp->v_tag == VT_NFS) 1634 vnd->sc_maxactive = 2; 1635 else 1636 vnd->sc_maxactive = 8; 1637 1638 if (vnd->sc_maxactive < 1) 1639 vnd->sc_maxactive = 1; 1640 } 1641 1642 #if 0 1643 static void 1644 vndshutdown(void) 1645 { 1646 struct vnd_softc *vnd; 1647 1648 for (vnd = &vnd_softc[0]; vnd < &vnd_softc[numvnd]; vnd++) 1649 if (vnd->sc_flags & VNF_INITED) 1650 vndclear(vnd); 1651 } 1652 #endif 1653 1654 static void 1655 vndclear(struct vnd_softc *vnd, int myminor) 1656 { 1657 struct vnode *vp = vnd->sc_vp; 1658 int fflags = FREAD; 1659 int bmaj, cmaj, i, mn; 1660 int s; 1661 1662 #ifdef DEBUG 1663 if (vnddebug & VDB_FOLLOW) 1664 printf("vndclear(%p): vp %p\n", vnd, vp); 1665 #endif 1666 /* locate the major number */ 1667 bmaj = bdevsw_lookup_major(&vnd_bdevsw); 1668 cmaj = cdevsw_lookup_major(&vnd_cdevsw); 1669 1670 /* Nuke the vnodes for any open instances */ 1671 for (i = 0; i < MAXPARTITIONS; i++) { 1672 mn = DISKMINOR(device_unit(vnd->sc_dev), i); 1673 vdevgone(bmaj, mn, mn, VBLK); 1674 if (mn != myminor) /* XXX avoid to kill own vnode */ 1675 vdevgone(cmaj, mn, mn, VCHR); 1676 } 1677 1678 if ((vnd->sc_flags & VNF_READONLY) == 0) 1679 fflags |= FWRITE; 1680 1681 s = splbio(); 1682 bufq_drain(vnd->sc_tab); 1683 splx(s); 1684 1685 vnd->sc_flags |= VNF_VUNCONF; 1686 wakeup(&vnd->sc_tab); 1687 while (vnd->sc_flags & VNF_KTHREAD) 1688 tsleep(&vnd->sc_kthread, PRIBIO, "vnthr", 0); 1689 1690 #ifdef VND_COMPRESSION 1691 /* free the compressed file buffers */ 1692 if (vnd->sc_flags & VNF_COMP) { 1693 if (vnd->sc_comp_offsets) { 1694 free(vnd->sc_comp_offsets, M_DEVBUF); 1695 vnd->sc_comp_offsets = NULL; 1696 } 1697 if (vnd->sc_comp_buff) { 1698 free(vnd->sc_comp_buff, M_DEVBUF); 1699 vnd->sc_comp_buff = NULL; 1700 } 1701 if (vnd->sc_comp_decombuf) { 1702 free(vnd->sc_comp_decombuf, M_DEVBUF); 1703 vnd->sc_comp_decombuf = NULL; 1704 } 1705 } 1706 #endif /* VND_COMPRESSION */ 1707 vnd->sc_flags &= 1708 ~(VNF_INITED | VNF_READONLY | VNF_KLABEL | VNF_VLABEL 1709 | VNF_VUNCONF | VNF_COMP | VNF_CLEARING); 1710 if (vp == NULL) 1711 panic("vndclear: null vp"); 1712 (void) vn_close(vp, fflags, vnd->sc_cred); 1713 kauth_cred_free(vnd->sc_cred); 1714 vnd->sc_vp = NULL; 1715 vnd->sc_cred = NULL; 1716 vnd->sc_size = 0; 1717 } 1718 1719 static int 1720 vndsize(dev_t dev) 1721 { 1722 struct vnd_softc *sc; 1723 struct disklabel *lp; 1724 int part, unit, omask; 1725 int size; 1726 1727 unit = vndunit(dev); 1728 sc = device_lookup_private(&vnd_cd, unit); 1729 if (sc == NULL) 1730 return -1; 1731 1732 if ((sc->sc_flags & VNF_INITED) == 0) 1733 return -1; 1734 1735 part = DISKPART(dev); 1736 omask = sc->sc_dkdev.dk_openmask & (1 << part); 1737 lp = sc->sc_dkdev.dk_label; 1738 1739 if (omask == 0 && vndopen(dev, 0, S_IFBLK, curlwp)) /* XXX */ 1740 return -1; 1741 1742 if (lp->d_partitions[part].p_fstype != FS_SWAP) 1743 size = -1; 1744 else 1745 size = lp->d_partitions[part].p_size * 1746 (lp->d_secsize / DEV_BSIZE); 1747 1748 if (omask == 0 && vndclose(dev, 0, S_IFBLK, curlwp)) /* XXX */ 1749 return -1; 1750 1751 return size; 1752 } 1753 1754 static int 1755 vnddump(dev_t dev, daddr_t blkno, void *va, 1756 size_t size) 1757 { 1758 1759 /* Not implemented. */ 1760 return ENXIO; 1761 } 1762 1763 static void 1764 vndgetdefaultlabel(struct vnd_softc *sc, struct disklabel *lp) 1765 { 1766 struct vndgeom *vng = &sc->sc_geom; 1767 struct partition *pp; 1768 unsigned spb; 1769 1770 memset(lp, 0, sizeof(*lp)); 1771 1772 spb = vng->vng_secsize / DEV_BSIZE; 1773 if (sc->sc_size / spb > UINT32_MAX) 1774 lp->d_secperunit = UINT32_MAX; 1775 else 1776 lp->d_secperunit = sc->sc_size / spb; 1777 lp->d_secsize = vng->vng_secsize; 1778 lp->d_nsectors = vng->vng_nsectors; 1779 lp->d_ntracks = vng->vng_ntracks; 1780 lp->d_ncylinders = vng->vng_ncylinders; 1781 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 1782 1783 strncpy(lp->d_typename, "vnd", sizeof(lp->d_typename)); 1784 lp->d_type = DKTYPE_VND; 1785 strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname)); 1786 lp->d_rpm = 3600; 1787 lp->d_interleave = 1; 1788 lp->d_flags = 0; 1789 1790 pp = &lp->d_partitions[RAW_PART]; 1791 pp->p_offset = 0; 1792 pp->p_size = lp->d_secperunit; 1793 pp->p_fstype = FS_UNUSED; 1794 lp->d_npartitions = RAW_PART + 1; 1795 1796 lp->d_magic = DISKMAGIC; 1797 lp->d_magic2 = DISKMAGIC; 1798 lp->d_checksum = dkcksum(lp); 1799 } 1800 1801 /* 1802 * Read the disklabel from a vnd. If one is not present, create a fake one. 1803 */ 1804 static void 1805 vndgetdisklabel(dev_t dev, struct vnd_softc *sc) 1806 { 1807 const char *errstring; 1808 struct disklabel *lp = sc->sc_dkdev.dk_label; 1809 struct cpu_disklabel *clp = sc->sc_dkdev.dk_cpulabel; 1810 int i; 1811 1812 memset(clp, 0, sizeof(*clp)); 1813 1814 vndgetdefaultlabel(sc, lp); 1815 1816 /* 1817 * Call the generic disklabel extraction routine. 1818 */ 1819 errstring = readdisklabel(VNDLABELDEV(dev), vndstrategy, lp, clp); 1820 if (errstring) { 1821 /* 1822 * Lack of disklabel is common, but we print the warning 1823 * anyway, since it might contain other useful information. 1824 */ 1825 aprint_normal_dev(sc->sc_dev, "%s\n", errstring); 1826 1827 /* 1828 * For historical reasons, if there's no disklabel 1829 * present, all partitions must be FS_BSDFFS and 1830 * occupy the entire disk. 1831 */ 1832 for (i = 0; i < MAXPARTITIONS; i++) { 1833 /* 1834 * Don't wipe out port specific hack (such as 1835 * dos partition hack of i386 port). 1836 */ 1837 if (lp->d_partitions[i].p_size != 0) 1838 continue; 1839 1840 lp->d_partitions[i].p_size = lp->d_secperunit; 1841 lp->d_partitions[i].p_offset = 0; 1842 lp->d_partitions[i].p_fstype = FS_BSDFFS; 1843 } 1844 1845 strncpy(lp->d_packname, "default label", 1846 sizeof(lp->d_packname)); 1847 1848 lp->d_npartitions = MAXPARTITIONS; 1849 lp->d_checksum = dkcksum(lp); 1850 } 1851 } 1852 1853 /* 1854 * Wait interruptibly for an exclusive lock. 1855 * 1856 * XXX 1857 * Several drivers do this; it should be abstracted and made MP-safe. 1858 */ 1859 static int 1860 vndlock(struct vnd_softc *sc) 1861 { 1862 int error; 1863 1864 while ((sc->sc_flags & VNF_LOCKED) != 0) { 1865 sc->sc_flags |= VNF_WANTED; 1866 if ((error = tsleep(sc, PRIBIO | PCATCH, "vndlck", 0)) != 0) 1867 return error; 1868 } 1869 sc->sc_flags |= VNF_LOCKED; 1870 return 0; 1871 } 1872 1873 /* 1874 * Unlock and wake up any waiters. 1875 */ 1876 static void 1877 vndunlock(struct vnd_softc *sc) 1878 { 1879 1880 sc->sc_flags &= ~VNF_LOCKED; 1881 if ((sc->sc_flags & VNF_WANTED) != 0) { 1882 sc->sc_flags &= ~VNF_WANTED; 1883 wakeup(sc); 1884 } 1885 } 1886 1887 #ifdef VND_COMPRESSION 1888 /* compressed file read */ 1889 static void 1890 compstrategy(struct buf *bp, off_t bn) 1891 { 1892 int error; 1893 int unit = vndunit(bp->b_dev); 1894 struct vnd_softc *vnd = 1895 device_lookup_private(&vnd_cd, unit); 1896 u_int32_t comp_block; 1897 struct uio auio; 1898 char *addr; 1899 int s; 1900 1901 /* set up constants for data move */ 1902 auio.uio_rw = UIO_READ; 1903 UIO_SETUP_SYSSPACE(&auio); 1904 1905 /* read, and transfer the data */ 1906 addr = bp->b_data; 1907 bp->b_resid = bp->b_bcount; 1908 s = splbio(); 1909 while (bp->b_resid > 0) { 1910 unsigned length; 1911 size_t length_in_buffer; 1912 u_int32_t offset_in_buffer; 1913 struct iovec aiov; 1914 1915 /* calculate the compressed block number */ 1916 comp_block = bn / (off_t)vnd->sc_comp_blksz; 1917 1918 /* check for good block number */ 1919 if (comp_block >= vnd->sc_comp_numoffs) { 1920 bp->b_error = EINVAL; 1921 splx(s); 1922 return; 1923 } 1924 1925 /* read in the compressed block, if not in buffer */ 1926 if (comp_block != vnd->sc_comp_buffblk) { 1927 length = vnd->sc_comp_offsets[comp_block + 1] - 1928 vnd->sc_comp_offsets[comp_block]; 1929 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 1930 error = vn_rdwr(UIO_READ, vnd->sc_vp, vnd->sc_comp_buff, 1931 length, vnd->sc_comp_offsets[comp_block], 1932 UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, vnd->sc_cred, 1933 NULL, NULL); 1934 if (error) { 1935 bp->b_error = error; 1936 VOP_UNLOCK(vnd->sc_vp); 1937 splx(s); 1938 return; 1939 } 1940 /* uncompress the buffer */ 1941 vnd->sc_comp_stream.next_in = vnd->sc_comp_buff; 1942 vnd->sc_comp_stream.avail_in = length; 1943 vnd->sc_comp_stream.next_out = vnd->sc_comp_decombuf; 1944 vnd->sc_comp_stream.avail_out = vnd->sc_comp_blksz; 1945 inflateReset(&vnd->sc_comp_stream); 1946 error = inflate(&vnd->sc_comp_stream, Z_FINISH); 1947 if (error != Z_STREAM_END) { 1948 if (vnd->sc_comp_stream.msg) 1949 aprint_normal_dev(vnd->sc_dev, 1950 "compressed file, %s\n", 1951 vnd->sc_comp_stream.msg); 1952 bp->b_error = EBADMSG; 1953 VOP_UNLOCK(vnd->sc_vp); 1954 splx(s); 1955 return; 1956 } 1957 vnd->sc_comp_buffblk = comp_block; 1958 VOP_UNLOCK(vnd->sc_vp); 1959 } 1960 1961 /* transfer the usable uncompressed data */ 1962 offset_in_buffer = bn % (off_t)vnd->sc_comp_blksz; 1963 length_in_buffer = vnd->sc_comp_blksz - offset_in_buffer; 1964 if (length_in_buffer > bp->b_resid) 1965 length_in_buffer = bp->b_resid; 1966 auio.uio_iov = &aiov; 1967 auio.uio_iovcnt = 1; 1968 aiov.iov_base = addr; 1969 aiov.iov_len = length_in_buffer; 1970 auio.uio_resid = aiov.iov_len; 1971 auio.uio_offset = 0; 1972 error = uiomove(vnd->sc_comp_decombuf + offset_in_buffer, 1973 length_in_buffer, &auio); 1974 if (error) { 1975 bp->b_error = error; 1976 splx(s); 1977 return; 1978 } 1979 1980 bn += length_in_buffer; 1981 addr += length_in_buffer; 1982 bp->b_resid -= length_in_buffer; 1983 } 1984 splx(s); 1985 } 1986 1987 /* compression memory allocation routines */ 1988 static void * 1989 vnd_alloc(void *aux, u_int items, u_int siz) 1990 { 1991 return malloc(items * siz, M_TEMP, M_NOWAIT); 1992 } 1993 1994 static void 1995 vnd_free(void *aux, void *ptr) 1996 { 1997 free(ptr, M_TEMP); 1998 } 1999 #endif /* VND_COMPRESSION */ 2000 2001 static void 2002 vnd_set_geometry(struct vnd_softc *vnd) 2003 { 2004 struct disk_geom *dg = &vnd->sc_dkdev.dk_geom; 2005 2006 memset(dg, 0, sizeof(*dg)); 2007 2008 dg->dg_secperunit = (int64_t)vnd->sc_geom.vng_nsectors * 2009 vnd->sc_geom.vng_ntracks * vnd->sc_geom.vng_ncylinders; 2010 dg->dg_secsize = vnd->sc_geom.vng_secsize; 2011 dg->dg_nsectors = vnd->sc_geom.vng_nsectors; 2012 dg->dg_ntracks = vnd->sc_geom.vng_ntracks; 2013 dg->dg_ncylinders = vnd->sc_geom.vng_ncylinders; 2014 2015 #ifdef DEBUG 2016 if (vnddebug & VDB_LABEL) { 2017 printf("dg->dg_secperunit: %" PRId64 "\n", dg->dg_secperunit); 2018 printf("dg->dg_ncylinders: %u\n", dg->dg_ncylinders); 2019 } 2020 #endif 2021 disk_set_info(vnd->sc_dev, &vnd->sc_dkdev, NULL); 2022 } 2023 2024 #ifdef _MODULE 2025 2026 #include <sys/module.h> 2027 2028 #ifdef VND_COMPRESSION 2029 #define VND_DEPENDS "zlib" 2030 #else 2031 #define VND_DEPENDS NULL 2032 #endif 2033 2034 MODULE(MODULE_CLASS_DRIVER, vnd, VND_DEPENDS); 2035 CFDRIVER_DECL(vnd, DV_DISK, NULL); 2036 2037 static int 2038 vnd_modcmd(modcmd_t cmd, void *arg) 2039 { 2040 int bmajor = -1, cmajor = -1, error = 0; 2041 2042 switch (cmd) { 2043 case MODULE_CMD_INIT: 2044 error = config_cfdriver_attach(&vnd_cd); 2045 if (error) 2046 break; 2047 2048 error = config_cfattach_attach(vnd_cd.cd_name, &vnd_ca); 2049 if (error) { 2050 config_cfdriver_detach(&vnd_cd); 2051 aprint_error("%s: unable to register cfattach\n", 2052 vnd_cd.cd_name); 2053 break; 2054 } 2055 2056 error = devsw_attach("vnd", &vnd_bdevsw, &bmajor, 2057 &vnd_cdevsw, &cmajor); 2058 if (error) { 2059 config_cfattach_detach(vnd_cd.cd_name, &vnd_ca); 2060 config_cfdriver_detach(&vnd_cd); 2061 break; 2062 } 2063 2064 break; 2065 2066 case MODULE_CMD_FINI: 2067 error = config_cfattach_detach(vnd_cd.cd_name, &vnd_ca); 2068 if (error) 2069 break; 2070 config_cfdriver_detach(&vnd_cd); 2071 devsw_detach(&vnd_bdevsw, &vnd_cdevsw); 2072 break; 2073 2074 case MODULE_CMD_STAT: 2075 return ENOTTY; 2076 2077 default: 2078 return ENOTTY; 2079 } 2080 2081 return error; 2082 } 2083 2084 #endif 2085
Indexes created Mon Sep 29 21:09:56 GMT 2025