vnd.c revision 1.248
1 /* $NetBSD: vnd.c,v 1.248 2015/08/20 14:40:17 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 1.248 2015/08/20 14:40:17 christos Exp $"); 95 96 #if defined(_KERNEL_OPT) 97 #include "opt_vnd.h" 98 #include "opt_compat_netbsd.h" 99 #endif 100 101 #include <sys/param.h> 102 #include <sys/systm.h> 103 #include <sys/namei.h> 104 #include <sys/proc.h> 105 #include <sys/kthread.h> 106 #include <sys/errno.h> 107 #include <sys/buf.h> 108 #include <sys/bufq.h> 109 #include <sys/malloc.h> 110 #include <sys/ioctl.h> 111 #include <sys/disklabel.h> 112 #include <sys/device.h> 113 #include <sys/disk.h> 114 #include <sys/stat.h> 115 #include <sys/mount.h> 116 #include <sys/vnode.h> 117 #include <sys/file.h> 118 #include <sys/uio.h> 119 #include <sys/conf.h> 120 #include <sys/kauth.h> 121 122 #include <net/zlib.h> 123 124 #include <miscfs/genfs/genfs.h> 125 #include <miscfs/specfs/specdev.h> 126 127 #include <dev/dkvar.h> 128 #include <dev/vndvar.h> 129 130 #include "ioconf.h" 131 132 #if defined(VNDDEBUG) && !defined(DEBUG) 133 #define DEBUG 134 #endif 135 136 #ifdef DEBUG 137 int dovndcluster = 1; 138 #define VDB_FOLLOW 0x01 139 #define VDB_INIT 0x02 140 #define VDB_IO 0x04 141 #define VDB_LABEL 0x08 142 int vnddebug = 0x00; 143 #endif 144 145 #define vndunit(x) DISKUNIT(x) 146 147 struct vndxfer { 148 struct buf vx_buf; 149 struct vnd_softc *vx_vnd; 150 }; 151 #define VND_BUFTOXFER(bp) ((struct vndxfer *)(void *)bp) 152 153 #define VND_GETXFER(vnd) pool_get(&(vnd)->sc_vxpool, PR_WAITOK) 154 #define VND_PUTXFER(vnd, vx) pool_put(&(vnd)->sc_vxpool, (vx)) 155 156 #define VNDLABELDEV(dev) \ 157 (MAKEDISKDEV(major((dev)), vndunit((dev)), RAW_PART)) 158 159 #define VND_MAXPENDING(vnd) ((vnd)->sc_maxactive * 4) 160 161 162 static void vndclear(struct vnd_softc *, int); 163 static int vnddoclear(struct vnd_softc *, int, int, bool); 164 static int vndsetcred(struct vnd_softc *, kauth_cred_t); 165 static void vndthrottle(struct vnd_softc *, struct vnode *); 166 static void vndiodone(struct buf *); 167 #if 0 168 static void vndshutdown(void); 169 #endif 170 171 static void vndgetdefaultlabel(struct vnd_softc *, struct disklabel *); 172 static void vndgetdisklabel(dev_t, struct vnd_softc *); 173 174 static int vndlock(struct vnd_softc *); 175 static void vndunlock(struct vnd_softc *); 176 #ifdef VND_COMPRESSION 177 static void compstrategy(struct buf *, off_t); 178 static void *vnd_alloc(void *, u_int, u_int); 179 static void vnd_free(void *, void *); 180 #endif /* VND_COMPRESSION */ 181 182 static void vndthread(void *); 183 static bool vnode_has_op(const struct vnode *, int); 184 static void handle_with_rdwr(struct vnd_softc *, const struct buf *, 185 struct buf *); 186 static void handle_with_strategy(struct vnd_softc *, const struct buf *, 187 struct buf *); 188 static void vnd_set_geometry(struct vnd_softc *); 189 190 static dev_type_open(vndopen); 191 static dev_type_close(vndclose); 192 static dev_type_read(vndread); 193 static dev_type_write(vndwrite); 194 static dev_type_ioctl(vndioctl); 195 static dev_type_strategy(vndstrategy); 196 static dev_type_dump(vnddump); 197 static dev_type_size(vndsize); 198 199 const struct bdevsw vnd_bdevsw = { 200 .d_open = vndopen, 201 .d_close = vndclose, 202 .d_strategy = vndstrategy, 203 .d_ioctl = vndioctl, 204 .d_dump = vnddump, 205 .d_psize = vndsize, 206 .d_discard = nodiscard, 207 .d_flag = D_DISK 208 }; 209 210 const struct cdevsw vnd_cdevsw = { 211 .d_open = vndopen, 212 .d_close = vndclose, 213 .d_read = vndread, 214 .d_write = vndwrite, 215 .d_ioctl = vndioctl, 216 .d_stop = nostop, 217 .d_tty = notty, 218 .d_poll = nopoll, 219 .d_mmap = nommap, 220 .d_kqfilter = nokqfilter, 221 .d_discard = nodiscard, 222 .d_flag = D_DISK 223 }; 224 225 static int vnd_match(device_t, cfdata_t, void *); 226 static void vnd_attach(device_t, device_t, void *); 227 static int vnd_detach(device_t, int); 228 229 CFATTACH_DECL3_NEW(vnd, sizeof(struct vnd_softc), 230 vnd_match, vnd_attach, vnd_detach, NULL, NULL, NULL, DVF_DETACH_SHUTDOWN); 231 extern struct cfdriver vnd_cd; 232 233 static struct vnd_softc *vnd_spawn(int); 234 int vnd_destroy(device_t); 235 236 static struct dkdriver vnddkdriver = { 237 .d_strategy = vndstrategy, 238 .d_minphys = minphys 239 }; 240 241 void 242 vndattach(int num) 243 { 244 int error; 245 246 error = config_cfattach_attach(vnd_cd.cd_name, &vnd_ca); 247 if (error) 248 aprint_error("%s: unable to register cfattach, error = %d\n", 249 vnd_cd.cd_name, error); 250 } 251 252 static int 253 vnd_match(device_t self, cfdata_t cfdata, void *aux) 254 { 255 256 return 1; 257 } 258 259 static void 260 vnd_attach(device_t parent, device_t self, void *aux) 261 { 262 struct vnd_softc *sc = device_private(self); 263 264 sc->sc_dev = self; 265 sc->sc_comp_offsets = NULL; 266 sc->sc_comp_buff = NULL; 267 sc->sc_comp_decombuf = NULL; 268 bufq_alloc(&sc->sc_tab, "disksort", BUFQ_SORT_RAWBLOCK); 269 disk_init(&sc->sc_dkdev, device_xname(self), &vnddkdriver); 270 if (!pmf_device_register(self, NULL, NULL)) 271 aprint_error_dev(self, "couldn't establish power handler\n"); 272 } 273 274 static int 275 vnd_detach(device_t self, int flags) 276 { 277 int error; 278 struct vnd_softc *sc = device_private(self); 279 280 if (sc->sc_flags & VNF_INITED) { 281 error = vnddoclear(sc, 0, -1, (flags & DETACH_FORCE) != 0); 282 if (error != 0) 283 return error; 284 } 285 286 pmf_device_deregister(self); 287 bufq_free(sc->sc_tab); 288 disk_destroy(&sc->sc_dkdev); 289 290 return 0; 291 } 292 293 static struct vnd_softc * 294 vnd_spawn(int unit) 295 { 296 cfdata_t cf; 297 298 cf = malloc(sizeof(*cf), M_DEVBUF, M_WAITOK); 299 cf->cf_name = vnd_cd.cd_name; 300 cf->cf_atname = vnd_cd.cd_name; 301 cf->cf_unit = unit; 302 cf->cf_fstate = FSTATE_STAR; 303 304 return device_private(config_attach_pseudo(cf)); 305 } 306 307 int 308 vnd_destroy(device_t dev) 309 { 310 int error; 311 cfdata_t cf; 312 313 cf = device_cfdata(dev); 314 error = config_detach(dev, DETACH_QUIET); 315 if (error) 316 return error; 317 free(cf, M_DEVBUF); 318 return 0; 319 } 320 321 static int 322 vndopen(dev_t dev, int flags, int mode, struct lwp *l) 323 { 324 int unit = vndunit(dev); 325 struct vnd_softc *sc; 326 int error = 0, part, pmask; 327 struct disklabel *lp; 328 329 #ifdef DEBUG 330 if (vnddebug & VDB_FOLLOW) 331 printf("vndopen(0x%"PRIx64", 0x%x, 0x%x, %p)\n", dev, flags, mode, l); 332 #endif 333 sc = device_lookup_private(&vnd_cd, unit); 334 if (sc == NULL) { 335 sc = vnd_spawn(unit); 336 if (sc == NULL) 337 return ENOMEM; 338 339 /* compatibility, keep disklabel after close */ 340 sc->sc_flags = VNF_KLABEL; 341 } 342 343 if ((error = vndlock(sc)) != 0) 344 return error; 345 346 mutex_enter(&sc->sc_dkdev.dk_openlock); 347 348 if ((sc->sc_flags & VNF_CLEARING) != 0) { 349 error = ENXIO; 350 goto done; 351 } 352 353 lp = sc->sc_dkdev.dk_label; 354 355 part = DISKPART(dev); 356 pmask = (1 << part); 357 358 if (sc->sc_dkdev.dk_nwedges != 0 && part != RAW_PART) { 359 error = EBUSY; 360 goto done; 361 } 362 363 if (sc->sc_flags & VNF_INITED) { 364 if ((sc->sc_dkdev.dk_openmask & ~(1<<RAW_PART)) != 0) { 365 /* 366 * If any non-raw partition is open, but the disk 367 * has been invalidated, disallow further opens. 368 */ 369 if ((sc->sc_flags & VNF_VLABEL) == 0) { 370 error = EIO; 371 goto done; 372 } 373 } else { 374 /* 375 * Load the partition info if not already loaded. 376 */ 377 if ((sc->sc_flags & VNF_VLABEL) == 0) { 378 sc->sc_flags |= VNF_VLABEL; 379 vndgetdisklabel(dev, sc); 380 } 381 } 382 } 383 384 /* Check that the partitions exists. */ 385 if (part != RAW_PART) { 386 if (((sc->sc_flags & VNF_INITED) == 0) || 387 ((part >= lp->d_npartitions) || 388 (lp->d_partitions[part].p_fstype == FS_UNUSED))) { 389 error = ENXIO; 390 goto done; 391 } 392 } 393 394 /* Prevent our unit from being unconfigured while open. */ 395 switch (mode) { 396 case S_IFCHR: 397 sc->sc_dkdev.dk_copenmask |= pmask; 398 break; 399 400 case S_IFBLK: 401 sc->sc_dkdev.dk_bopenmask |= pmask; 402 break; 403 } 404 sc->sc_dkdev.dk_openmask = 405 sc->sc_dkdev.dk_copenmask | sc->sc_dkdev.dk_bopenmask; 406 407 done: 408 mutex_exit(&sc->sc_dkdev.dk_openlock); 409 vndunlock(sc); 410 return error; 411 } 412 413 static int 414 vndclose(dev_t dev, int flags, int mode, struct lwp *l) 415 { 416 int unit = vndunit(dev); 417 struct vnd_softc *sc; 418 int error = 0, part; 419 420 #ifdef DEBUG 421 if (vnddebug & VDB_FOLLOW) 422 printf("vndclose(0x%"PRIx64", 0x%x, 0x%x, %p)\n", dev, flags, mode, l); 423 #endif 424 sc = device_lookup_private(&vnd_cd, unit); 425 if (sc == NULL) 426 return ENXIO; 427 428 if ((error = vndlock(sc)) != 0) 429 return error; 430 431 mutex_enter(&sc->sc_dkdev.dk_openlock); 432 433 part = DISKPART(dev); 434 435 /* ...that much closer to allowing unconfiguration... */ 436 switch (mode) { 437 case S_IFCHR: 438 sc->sc_dkdev.dk_copenmask &= ~(1 << part); 439 break; 440 441 case S_IFBLK: 442 sc->sc_dkdev.dk_bopenmask &= ~(1 << part); 443 break; 444 } 445 sc->sc_dkdev.dk_openmask = 446 sc->sc_dkdev.dk_copenmask | sc->sc_dkdev.dk_bopenmask; 447 448 /* are we last opener ? */ 449 if (sc->sc_dkdev.dk_openmask == 0) { 450 if ((sc->sc_flags & VNF_KLABEL) == 0) 451 sc->sc_flags &= ~VNF_VLABEL; 452 } 453 454 mutex_exit(&sc->sc_dkdev.dk_openlock); 455 456 vndunlock(sc); 457 458 if ((sc->sc_flags & VNF_INITED) == 0) { 459 if ((error = vnd_destroy(sc->sc_dev)) != 0) { 460 aprint_error_dev(sc->sc_dev, 461 "unable to detach instance\n"); 462 return error; 463 } 464 } 465 466 return 0; 467 } 468 469 /* 470 * Queue the request, and wakeup the kernel thread to handle it. 471 */ 472 static void 473 vndstrategy(struct buf *bp) 474 { 475 int unit = vndunit(bp->b_dev); 476 struct vnd_softc *vnd = 477 device_lookup_private(&vnd_cd, unit); 478 struct disklabel *lp; 479 daddr_t blkno; 480 int s = splbio(); 481 482 if (vnd == NULL) { 483 bp->b_error = ENXIO; 484 goto done; 485 } 486 lp = vnd->sc_dkdev.dk_label; 487 488 if ((vnd->sc_flags & VNF_INITED) == 0) { 489 bp->b_error = ENXIO; 490 goto done; 491 } 492 493 /* 494 * The transfer must be a whole number of blocks. 495 */ 496 if ((bp->b_bcount % lp->d_secsize) != 0) { 497 bp->b_error = EINVAL; 498 goto done; 499 } 500 501 /* 502 * check if we're read-only. 503 */ 504 if ((vnd->sc_flags & VNF_READONLY) && !(bp->b_flags & B_READ)) { 505 bp->b_error = EACCES; 506 goto done; 507 } 508 509 /* If it's a nil transfer, wake up the top half now. */ 510 if (bp->b_bcount == 0) { 511 goto done; 512 } 513 514 /* 515 * Do bounds checking and adjust transfer. If there's an error, 516 * the bounds check will flag that for us. 517 */ 518 if (DISKPART(bp->b_dev) == RAW_PART) { 519 if (bounds_check_with_mediasize(bp, DEV_BSIZE, 520 vnd->sc_size) <= 0) 521 goto done; 522 } else { 523 if (bounds_check_with_label(&vnd->sc_dkdev, 524 bp, vnd->sc_flags & (VNF_WLABEL|VNF_LABELLING)) <= 0) 525 goto done; 526 } 527 528 /* 529 * Put the block number in terms of the logical blocksize 530 * of the "device". 531 */ 532 533 blkno = bp->b_blkno / (lp->d_secsize / DEV_BSIZE); 534 535 /* 536 * Translate the partition-relative block number to an absolute. 537 */ 538 if (DISKPART(bp->b_dev) != RAW_PART) { 539 struct partition *pp; 540 541 pp = &vnd->sc_dkdev.dk_label->d_partitions[ 542 DISKPART(bp->b_dev)]; 543 blkno += pp->p_offset; 544 } 545 bp->b_rawblkno = blkno; 546 547 #ifdef DEBUG 548 if (vnddebug & VDB_FOLLOW) 549 printf("vndstrategy(%p): unit %d\n", bp, unit); 550 #endif 551 if ((vnd->sc_flags & VNF_USE_VN_RDWR)) { 552 KASSERT(vnd->sc_pending >= 0 && 553 vnd->sc_pending <= VND_MAXPENDING(vnd)); 554 while (vnd->sc_pending == VND_MAXPENDING(vnd)) 555 tsleep(&vnd->sc_pending, PRIBIO, "vndpc", 0); 556 vnd->sc_pending++; 557 } 558 bufq_put(vnd->sc_tab, bp); 559 wakeup(&vnd->sc_tab); 560 splx(s); 561 return; 562 563 done: 564 bp->b_resid = bp->b_bcount; 565 biodone(bp); 566 splx(s); 567 } 568 569 static bool 570 vnode_has_strategy(struct vnd_softc *vnd) 571 { 572 return vnode_has_op(vnd->sc_vp, VOFFSET(vop_bmap)) && 573 vnode_has_op(vnd->sc_vp, VOFFSET(vop_strategy)); 574 } 575 576 /* XXX this function needs a reliable check to detect 577 * sparse files. Otherwise, bmap/strategy may be used 578 * and fail on non-allocated blocks. VOP_READ/VOP_WRITE 579 * works on sparse files. 580 */ 581 #if notyet 582 static bool 583 vnode_strategy_probe(struct vnd_softc *vnd) 584 { 585 int error; 586 daddr_t nbn; 587 588 if (!vnode_has_strategy(vnd)) 589 return false; 590 591 /* Convert the first logical block number to its 592 * physical block number. 593 */ 594 error = 0; 595 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 596 error = VOP_BMAP(vnd->sc_vp, 0, NULL, &nbn, NULL); 597 VOP_UNLOCK(vnd->sc_vp); 598 599 /* Test if that worked. */ 600 if (error == 0 && (long)nbn == -1) 601 return false; 602 603 return true; 604 } 605 #endif 606 607 static void 608 vndthread(void *arg) 609 { 610 struct vnd_softc *vnd = arg; 611 int s; 612 613 /* Determine whether we can *use* VOP_BMAP and VOP_STRATEGY to 614 * directly access the backing vnode. If we can, use these two 615 * operations to avoid messing with the local buffer cache. 616 * Otherwise fall back to regular VOP_READ/VOP_WRITE operations 617 * which are guaranteed to work with any file system. */ 618 if ((vnd->sc_flags & VNF_USE_VN_RDWR) == 0 && 619 ! vnode_has_strategy(vnd)) 620 vnd->sc_flags |= VNF_USE_VN_RDWR; 621 622 #ifdef DEBUG 623 if (vnddebug & VDB_INIT) 624 printf("vndthread: vp %p, %s\n", vnd->sc_vp, 625 (vnd->sc_flags & VNF_USE_VN_RDWR) == 0 ? 626 "using bmap/strategy operations" : 627 "using read/write operations"); 628 #endif 629 630 s = splbio(); 631 vnd->sc_flags |= VNF_KTHREAD; 632 wakeup(&vnd->sc_kthread); 633 634 /* 635 * Dequeue requests and serve them depending on the available 636 * vnode operations. 637 */ 638 while ((vnd->sc_flags & VNF_VUNCONF) == 0) { 639 struct vndxfer *vnx; 640 struct buf *obp; 641 struct buf *bp; 642 643 obp = bufq_get(vnd->sc_tab); 644 if (obp == NULL) { 645 tsleep(&vnd->sc_tab, PRIBIO, "vndbp", 0); 646 continue; 647 }; 648 if ((vnd->sc_flags & VNF_USE_VN_RDWR)) { 649 KASSERT(vnd->sc_pending > 0 && 650 vnd->sc_pending <= VND_MAXPENDING(vnd)); 651 if (vnd->sc_pending-- == VND_MAXPENDING(vnd)) 652 wakeup(&vnd->sc_pending); 653 } 654 splx(s); 655 #ifdef DEBUG 656 if (vnddebug & VDB_FOLLOW) 657 printf("vndthread(%p)\n", obp); 658 #endif 659 660 if (vnd->sc_vp->v_mount == NULL) { 661 obp->b_error = ENXIO; 662 goto done; 663 } 664 #ifdef VND_COMPRESSION 665 /* handle a compressed read */ 666 if ((obp->b_flags & B_READ) != 0 && (vnd->sc_flags & VNF_COMP)) { 667 off_t bn; 668 669 /* Convert to a byte offset within the file. */ 670 bn = obp->b_rawblkno * 671 vnd->sc_dkdev.dk_label->d_secsize; 672 673 compstrategy(obp, bn); 674 goto done; 675 } 676 #endif /* VND_COMPRESSION */ 677 678 /* 679 * Allocate a header for this transfer and link it to the 680 * buffer 681 */ 682 s = splbio(); 683 vnx = VND_GETXFER(vnd); 684 splx(s); 685 vnx->vx_vnd = vnd; 686 687 s = splbio(); 688 while (vnd->sc_active >= vnd->sc_maxactive) { 689 tsleep(&vnd->sc_tab, PRIBIO, "vndac", 0); 690 } 691 vnd->sc_active++; 692 splx(s); 693 694 /* Instrumentation. */ 695 disk_busy(&vnd->sc_dkdev); 696 697 bp = &vnx->vx_buf; 698 buf_init(bp); 699 bp->b_flags = (obp->b_flags & B_READ); 700 bp->b_oflags = obp->b_oflags; 701 bp->b_cflags = obp->b_cflags; 702 bp->b_iodone = vndiodone; 703 bp->b_private = obp; 704 bp->b_vp = vnd->sc_vp; 705 bp->b_objlock = bp->b_vp->v_interlock; 706 bp->b_data = obp->b_data; 707 bp->b_bcount = obp->b_bcount; 708 BIO_COPYPRIO(bp, obp); 709 710 /* Handle the request using the appropriate operations. */ 711 if ((vnd->sc_flags & VNF_USE_VN_RDWR) == 0) 712 handle_with_strategy(vnd, obp, bp); 713 else 714 handle_with_rdwr(vnd, obp, bp); 715 716 s = splbio(); 717 continue; 718 719 done: 720 biodone(obp); 721 s = splbio(); 722 } 723 724 vnd->sc_flags &= (~VNF_KTHREAD | VNF_VUNCONF); 725 wakeup(&vnd->sc_kthread); 726 splx(s); 727 kthread_exit(0); 728 } 729 730 /* 731 * Checks if the given vnode supports the requested operation. 732 * The operation is specified the offset returned by VOFFSET. 733 * 734 * XXX The test below used to determine this is quite fragile 735 * because it relies on the file system to use genfs to specify 736 * unimplemented operations. There might be another way to do 737 * it more cleanly. 738 */ 739 static bool 740 vnode_has_op(const struct vnode *vp, int opoffset) 741 { 742 int (*defaultp)(void *); 743 int (*opp)(void *); 744 745 defaultp = vp->v_op[VOFFSET(vop_default)]; 746 opp = vp->v_op[opoffset]; 747 748 return opp != defaultp && opp != genfs_eopnotsupp && 749 opp != genfs_badop && opp != genfs_nullop; 750 } 751 752 /* 753 * Handles the read/write request given in 'bp' using the vnode's VOP_READ 754 * and VOP_WRITE operations. 755 * 756 * 'obp' is a pointer to the original request fed to the vnd device. 757 */ 758 static void 759 handle_with_rdwr(struct vnd_softc *vnd, const struct buf *obp, struct buf *bp) 760 { 761 bool doread; 762 off_t offset; 763 size_t len, resid; 764 struct vnode *vp; 765 766 doread = bp->b_flags & B_READ; 767 offset = obp->b_rawblkno * vnd->sc_dkdev.dk_label->d_secsize; 768 len = bp->b_bcount; 769 vp = vnd->sc_vp; 770 771 #if defined(DEBUG) 772 if (vnddebug & VDB_IO) 773 printf("vnd (rdwr): vp %p, %s, rawblkno 0x%" PRIx64 774 ", secsize %d, offset %" PRIu64 775 ", bcount %d\n", 776 vp, doread ? "read" : "write", obp->b_rawblkno, 777 vnd->sc_dkdev.dk_label->d_secsize, offset, 778 bp->b_bcount); 779 #endif 780 781 /* Issue the read or write operation. */ 782 bp->b_error = 783 vn_rdwr(doread ? UIO_READ : UIO_WRITE, 784 vp, bp->b_data, len, offset, UIO_SYSSPACE, 785 IO_ADV_ENCODE(POSIX_FADV_NOREUSE), vnd->sc_cred, &resid, NULL); 786 bp->b_resid = resid; 787 788 mutex_enter(vp->v_interlock); 789 (void) VOP_PUTPAGES(vp, 0, 0, 790 PGO_ALLPAGES | PGO_CLEANIT | PGO_FREE | PGO_SYNCIO); 791 792 /* We need to increase the number of outputs on the vnode if 793 * there was any write to it. */ 794 if (!doread) { 795 mutex_enter(vp->v_interlock); 796 vp->v_numoutput++; 797 mutex_exit(vp->v_interlock); 798 } 799 800 biodone(bp); 801 } 802 803 /* 804 * Handes the read/write request given in 'bp' using the vnode's VOP_BMAP 805 * and VOP_STRATEGY operations. 806 * 807 * 'obp' is a pointer to the original request fed to the vnd device. 808 */ 809 static void 810 handle_with_strategy(struct vnd_softc *vnd, const struct buf *obp, 811 struct buf *bp) 812 { 813 int bsize, error, flags, skipped; 814 size_t resid, sz; 815 off_t bn, offset; 816 struct vnode *vp; 817 struct buf *nbp = NULL; 818 819 flags = obp->b_flags; 820 821 822 /* convert to a byte offset within the file. */ 823 bn = obp->b_rawblkno * vnd->sc_dkdev.dk_label->d_secsize; 824 825 bsize = vnd->sc_vp->v_mount->mnt_stat.f_iosize; 826 skipped = 0; 827 828 /* 829 * Break the request into bsize pieces and feed them 830 * sequentially using VOP_BMAP/VOP_STRATEGY. 831 * We do it this way to keep from flooding NFS servers if we 832 * are connected to an NFS file. This places the burden on 833 * the client rather than the server. 834 */ 835 error = 0; 836 bp->b_resid = bp->b_bcount; 837 for (offset = 0, resid = bp->b_resid; /* true */; 838 resid -= sz, offset += sz) { 839 daddr_t nbn; 840 int off, nra; 841 842 nra = 0; 843 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 844 error = VOP_BMAP(vnd->sc_vp, bn / bsize, &vp, &nbn, &nra); 845 VOP_UNLOCK(vnd->sc_vp); 846 847 if (error == 0 && (long)nbn == -1) 848 error = EIO; 849 850 /* 851 * If there was an error or a hole in the file...punt. 852 * Note that we may have to wait for any operations 853 * that we have already fired off before releasing 854 * the buffer. 855 * 856 * XXX we could deal with holes here but it would be 857 * a hassle (in the write case). 858 */ 859 if (error) { 860 skipped += resid; 861 break; 862 } 863 864 #ifdef DEBUG 865 if (!dovndcluster) 866 nra = 0; 867 #endif 868 869 off = bn % bsize; 870 sz = MIN(((off_t)1 + nra) * bsize - off, resid); 871 #ifdef DEBUG 872 if (vnddebug & VDB_IO) 873 printf("vndstrategy: vp %p/%p bn 0x%qx/0x%" PRIx64 874 " sz 0x%zx\n", vnd->sc_vp, vp, (long long)bn, 875 nbn, sz); 876 #endif 877 878 nbp = getiobuf(vp, true); 879 nestiobuf_setup(bp, nbp, offset, sz); 880 nbp->b_blkno = nbn + btodb(off); 881 882 #if 0 /* XXX #ifdef DEBUG */ 883 if (vnddebug & VDB_IO) 884 printf("vndstart(%ld): bp %p vp %p blkno " 885 "0x%" PRIx64 " flags %x addr %p cnt 0x%x\n", 886 (long) (vnd-vnd_softc), &nbp->vb_buf, 887 nbp->vb_buf.b_vp, nbp->vb_buf.b_blkno, 888 nbp->vb_buf.b_flags, nbp->vb_buf.b_data, 889 nbp->vb_buf.b_bcount); 890 #endif 891 if (resid == sz) { 892 break; 893 } 894 VOP_STRATEGY(vp, nbp); 895 bn += sz; 896 } 897 if (!(flags & B_READ)) { 898 struct vnode *w_vp; 899 /* 900 * this is the last nested buf, account for 901 * the parent buf write too. 902 * This has to be done last, so that 903 * fsync won't wait for this write which 904 * has no chance to complete before all nested bufs 905 * have been queued. But it has to be done 906 * before the last VOP_STRATEGY() 907 * or the call to nestiobuf_done(). 908 */ 909 w_vp = bp->b_vp; 910 mutex_enter(w_vp->v_interlock); 911 w_vp->v_numoutput++; 912 mutex_exit(w_vp->v_interlock); 913 } 914 KASSERT(skipped != 0 || nbp != NULL); 915 if (skipped) 916 nestiobuf_done(bp, skipped, error); 917 else 918 VOP_STRATEGY(vp, nbp); 919 } 920 921 static void 922 vndiodone(struct buf *bp) 923 { 924 struct vndxfer *vnx = VND_BUFTOXFER(bp); 925 struct vnd_softc *vnd = vnx->vx_vnd; 926 struct buf *obp = bp->b_private; 927 int s = splbio(); 928 929 KASSERT(&vnx->vx_buf == bp); 930 KASSERT(vnd->sc_active > 0); 931 #ifdef DEBUG 932 if (vnddebug & VDB_IO) { 933 printf("vndiodone1: bp %p iodone: error %d\n", 934 bp, bp->b_error); 935 } 936 #endif 937 disk_unbusy(&vnd->sc_dkdev, bp->b_bcount - bp->b_resid, 938 (bp->b_flags & B_READ)); 939 vnd->sc_active--; 940 if (vnd->sc_active == 0) { 941 wakeup(&vnd->sc_tab); 942 } 943 splx(s); 944 obp->b_error = bp->b_error; 945 obp->b_resid = bp->b_resid; 946 buf_destroy(bp); 947 VND_PUTXFER(vnd, vnx); 948 biodone(obp); 949 } 950 951 /* ARGSUSED */ 952 static int 953 vndread(dev_t dev, struct uio *uio, int flags) 954 { 955 int unit = vndunit(dev); 956 struct vnd_softc *sc; 957 958 #ifdef DEBUG 959 if (vnddebug & VDB_FOLLOW) 960 printf("vndread(0x%"PRIx64", %p)\n", dev, uio); 961 #endif 962 963 sc = device_lookup_private(&vnd_cd, unit); 964 if (sc == NULL) 965 return ENXIO; 966 967 if ((sc->sc_flags & VNF_INITED) == 0) 968 return ENXIO; 969 970 return physio(vndstrategy, NULL, dev, B_READ, minphys, uio); 971 } 972 973 /* ARGSUSED */ 974 static int 975 vndwrite(dev_t dev, struct uio *uio, int flags) 976 { 977 int unit = vndunit(dev); 978 struct vnd_softc *sc; 979 980 #ifdef DEBUG 981 if (vnddebug & VDB_FOLLOW) 982 printf("vndwrite(0x%"PRIx64", %p)\n", dev, uio); 983 #endif 984 985 sc = device_lookup_private(&vnd_cd, unit); 986 if (sc == NULL) 987 return ENXIO; 988 989 if ((sc->sc_flags & VNF_INITED) == 0) 990 return ENXIO; 991 992 return physio(vndstrategy, NULL, dev, B_WRITE, minphys, uio); 993 } 994 995 static int 996 vnd_cget(struct lwp *l, int unit, int *un, struct vattr *va) 997 { 998 int error; 999 struct vnd_softc *vnd; 1000 1001 if (*un == -1) 1002 *un = unit; 1003 if (*un < 0) 1004 return EINVAL; 1005 1006 vnd = device_lookup_private(&vnd_cd, *un); 1007 if (vnd == NULL) 1008 return -1; 1009 1010 if ((vnd->sc_flags & VNF_INITED) == 0) 1011 return -1; 1012 1013 vn_lock(vnd->sc_vp, LK_SHARED | LK_RETRY); 1014 error = VOP_GETATTR(vnd->sc_vp, va, l->l_cred); 1015 VOP_UNLOCK(vnd->sc_vp); 1016 return error; 1017 } 1018 1019 static int 1020 vnddoclear(struct vnd_softc *vnd, int pmask, int minor, bool force) 1021 { 1022 int error; 1023 1024 if ((error = vndlock(vnd)) != 0) 1025 return error; 1026 1027 /* 1028 * Don't unconfigure if any other partitions are open 1029 * or if both the character and block flavors of this 1030 * partition are open. 1031 */ 1032 if (DK_BUSY(vnd, pmask) && !force) { 1033 vndunlock(vnd); 1034 return EBUSY; 1035 } 1036 1037 /* Delete all of our wedges */ 1038 dkwedge_delall(&vnd->sc_dkdev); 1039 1040 /* 1041 * XXX vndclear() might call vndclose() implicitly; 1042 * release lock to avoid recursion 1043 * 1044 * Set VNF_CLEARING to prevent vndopen() from 1045 * sneaking in after we vndunlock(). 1046 */ 1047 vnd->sc_flags |= VNF_CLEARING; 1048 vndunlock(vnd); 1049 vndclear(vnd, minor); 1050 #ifdef DEBUG 1051 if (vnddebug & VDB_INIT) 1052 printf("vndioctl: CLRed\n"); 1053 #endif 1054 1055 /* Destroy the xfer and buffer pools. */ 1056 pool_destroy(&vnd->sc_vxpool); 1057 1058 /* Detach the disk. */ 1059 disk_detach(&vnd->sc_dkdev); 1060 1061 return 0; 1062 } 1063 1064 /* ARGSUSED */ 1065 static int 1066 vndioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 1067 { 1068 bool force; 1069 int unit = vndunit(dev); 1070 struct vnd_softc *vnd; 1071 struct vnd_ioctl *vio; 1072 struct vattr vattr; 1073 struct pathbuf *pb; 1074 struct nameidata nd; 1075 int error, part, pmask; 1076 uint64_t geomsize; 1077 int fflags; 1078 #ifdef __HAVE_OLD_DISKLABEL 1079 struct disklabel newlabel; 1080 #endif 1081 1082 #ifdef DEBUG 1083 if (vnddebug & VDB_FOLLOW) 1084 printf("vndioctl(0x%"PRIx64", 0x%lx, %p, 0x%x, %p): unit %d\n", 1085 dev, cmd, data, flag, l->l_proc, unit); 1086 #endif 1087 vnd = device_lookup_private(&vnd_cd, unit); 1088 if (vnd == NULL && 1089 #ifdef COMPAT_30 1090 cmd != VNDIOCGET30 && 1091 #endif 1092 #ifdef COMPAT_50 1093 cmd != VNDIOCGET50 && 1094 #endif 1095 cmd != VNDIOCGET) 1096 return ENXIO; 1097 vio = (struct vnd_ioctl *)data; 1098 1099 /* Must be open for writes for these commands... */ 1100 switch (cmd) { 1101 case VNDIOCSET: 1102 case VNDIOCCLR: 1103 #ifdef COMPAT_50 1104 case VNDIOCSET50: 1105 case VNDIOCCLR50: 1106 #endif 1107 case DIOCSDINFO: 1108 case DIOCWDINFO: 1109 #ifdef __HAVE_OLD_DISKLABEL 1110 case ODIOCSDINFO: 1111 case ODIOCWDINFO: 1112 #endif 1113 case DIOCKLABEL: 1114 case DIOCWLABEL: 1115 if ((flag & FWRITE) == 0) 1116 return EBADF; 1117 } 1118 1119 /* Must be initialized for these... */ 1120 switch (cmd) { 1121 case VNDIOCCLR: 1122 #ifdef VNDIOCCLR50 1123 case VNDIOCCLR50: 1124 #endif 1125 case DIOCGDINFO: 1126 case DIOCSDINFO: 1127 case DIOCWDINFO: 1128 case DIOCGPART: 1129 case DIOCKLABEL: 1130 case DIOCWLABEL: 1131 case DIOCGDEFLABEL: 1132 case DIOCCACHESYNC: 1133 #ifdef __HAVE_OLD_DISKLABEL 1134 case ODIOCGDINFO: 1135 case ODIOCSDINFO: 1136 case ODIOCWDINFO: 1137 case ODIOCGDEFLABEL: 1138 #endif 1139 if ((vnd->sc_flags & VNF_INITED) == 0) 1140 return ENXIO; 1141 } 1142 1143 error = disk_ioctl(&vnd->sc_dkdev, dev, cmd, data, flag, l); 1144 if (error != EPASSTHROUGH) 1145 return error; 1146 1147 1148 switch (cmd) { 1149 #ifdef VNDIOCSET50 1150 case VNDIOCSET50: 1151 #endif 1152 case VNDIOCSET: 1153 if (vnd->sc_flags & VNF_INITED) 1154 return EBUSY; 1155 1156 if ((error = vndlock(vnd)) != 0) 1157 return error; 1158 1159 fflags = FREAD; 1160 if ((vio->vnd_flags & VNDIOF_READONLY) == 0) 1161 fflags |= FWRITE; 1162 error = pathbuf_copyin(vio->vnd_file, &pb); 1163 if (error) { 1164 goto unlock_and_exit; 1165 } 1166 NDINIT(&nd, LOOKUP, FOLLOW, pb); 1167 if ((error = vn_open(&nd, fflags, 0)) != 0) { 1168 pathbuf_destroy(pb); 1169 goto unlock_and_exit; 1170 } 1171 KASSERT(l); 1172 error = VOP_GETATTR(nd.ni_vp, &vattr, l->l_cred); 1173 if (!error && nd.ni_vp->v_type != VREG) 1174 error = EOPNOTSUPP; 1175 if (!error && vattr.va_bytes < vattr.va_size) 1176 /* File is definitely sparse, use vn_rdwr() */ 1177 vnd->sc_flags |= VNF_USE_VN_RDWR; 1178 if (error) { 1179 VOP_UNLOCK(nd.ni_vp); 1180 goto close_and_exit; 1181 } 1182 1183 /* If using a compressed file, initialize its info */ 1184 /* (or abort with an error if kernel has no compression) */ 1185 if (vio->vnd_flags & VNF_COMP) { 1186 #ifdef VND_COMPRESSION 1187 struct vnd_comp_header *ch; 1188 int i; 1189 u_int32_t comp_size; 1190 u_int32_t comp_maxsize; 1191 1192 /* allocate space for compresed file header */ 1193 ch = malloc(sizeof(struct vnd_comp_header), 1194 M_TEMP, M_WAITOK); 1195 1196 /* read compressed file header */ 1197 error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)ch, 1198 sizeof(struct vnd_comp_header), 0, UIO_SYSSPACE, 1199 IO_UNIT|IO_NODELOCKED, l->l_cred, NULL, NULL); 1200 if (error) { 1201 free(ch, M_TEMP); 1202 VOP_UNLOCK(nd.ni_vp); 1203 goto close_and_exit; 1204 } 1205 1206 /* save some header info */ 1207 vnd->sc_comp_blksz = ntohl(ch->block_size); 1208 /* note last offset is the file byte size */ 1209 vnd->sc_comp_numoffs = ntohl(ch->num_blocks)+1; 1210 free(ch, M_TEMP); 1211 if (vnd->sc_comp_blksz == 0 || 1212 vnd->sc_comp_blksz % DEV_BSIZE !=0) { 1213 VOP_UNLOCK(nd.ni_vp); 1214 error = EINVAL; 1215 goto close_and_exit; 1216 } 1217 if (sizeof(struct vnd_comp_header) + 1218 sizeof(u_int64_t) * vnd->sc_comp_numoffs > 1219 vattr.va_size) { 1220 VOP_UNLOCK(nd.ni_vp); 1221 error = EINVAL; 1222 goto close_and_exit; 1223 } 1224 1225 /* set decompressed file size */ 1226 vattr.va_size = 1227 ((u_quad_t)vnd->sc_comp_numoffs - 1) * 1228 (u_quad_t)vnd->sc_comp_blksz; 1229 1230 /* allocate space for all the compressed offsets */ 1231 vnd->sc_comp_offsets = 1232 malloc(sizeof(u_int64_t) * vnd->sc_comp_numoffs, 1233 M_DEVBUF, M_WAITOK); 1234 1235 /* read in the offsets */ 1236 error = vn_rdwr(UIO_READ, nd.ni_vp, 1237 (void *)vnd->sc_comp_offsets, 1238 sizeof(u_int64_t) * vnd->sc_comp_numoffs, 1239 sizeof(struct vnd_comp_header), UIO_SYSSPACE, 1240 IO_UNIT|IO_NODELOCKED, l->l_cred, NULL, NULL); 1241 if (error) { 1242 VOP_UNLOCK(nd.ni_vp); 1243 goto close_and_exit; 1244 } 1245 /* 1246 * find largest block size (used for allocation limit). 1247 * Also convert offset to native byte order. 1248 */ 1249 comp_maxsize = 0; 1250 for (i = 0; i < vnd->sc_comp_numoffs - 1; i++) { 1251 vnd->sc_comp_offsets[i] = 1252 be64toh(vnd->sc_comp_offsets[i]); 1253 comp_size = be64toh(vnd->sc_comp_offsets[i + 1]) 1254 - vnd->sc_comp_offsets[i]; 1255 if (comp_size > comp_maxsize) 1256 comp_maxsize = comp_size; 1257 } 1258 vnd->sc_comp_offsets[vnd->sc_comp_numoffs - 1] = 1259 be64toh(vnd->sc_comp_offsets[vnd->sc_comp_numoffs - 1]); 1260 1261 /* create compressed data buffer */ 1262 vnd->sc_comp_buff = malloc(comp_maxsize, 1263 M_DEVBUF, M_WAITOK); 1264 1265 /* create decompressed buffer */ 1266 vnd->sc_comp_decombuf = malloc(vnd->sc_comp_blksz, 1267 M_DEVBUF, M_WAITOK); 1268 vnd->sc_comp_buffblk = -1; 1269 1270 /* Initialize decompress stream */ 1271 memset(&vnd->sc_comp_stream, 0, sizeof(z_stream)); 1272 vnd->sc_comp_stream.zalloc = vnd_alloc; 1273 vnd->sc_comp_stream.zfree = vnd_free; 1274 error = inflateInit2(&vnd->sc_comp_stream, MAX_WBITS); 1275 if (error) { 1276 if (vnd->sc_comp_stream.msg) 1277 printf("vnd%d: compressed file, %s\n", 1278 unit, vnd->sc_comp_stream.msg); 1279 VOP_UNLOCK(nd.ni_vp); 1280 error = EINVAL; 1281 goto close_and_exit; 1282 } 1283 1284 vnd->sc_flags |= VNF_COMP | VNF_READONLY; 1285 #else /* !VND_COMPRESSION */ 1286 VOP_UNLOCK(nd.ni_vp); 1287 error = EOPNOTSUPP; 1288 goto close_and_exit; 1289 #endif /* VND_COMPRESSION */ 1290 } 1291 1292 VOP_UNLOCK(nd.ni_vp); 1293 vnd->sc_vp = nd.ni_vp; 1294 vnd->sc_size = btodb(vattr.va_size); /* note truncation */ 1295 1296 /* 1297 * Use pseudo-geometry specified. If none was provided, 1298 * use "standard" Adaptec fictitious geometry. 1299 */ 1300 if (vio->vnd_flags & VNDIOF_HASGEOM) { 1301 1302 memcpy(&vnd->sc_geom, &vio->vnd_geom, 1303 sizeof(vio->vnd_geom)); 1304 1305 /* 1306 * Sanity-check the sector size. 1307 * XXX Don't allow secsize < DEV_BSIZE. Should 1308 * XXX we? 1309 */ 1310 if (vnd->sc_geom.vng_secsize < DEV_BSIZE || 1311 (vnd->sc_geom.vng_secsize % DEV_BSIZE) != 0 || 1312 vnd->sc_geom.vng_ncylinders == 0 || 1313 (vnd->sc_geom.vng_ntracks * 1314 vnd->sc_geom.vng_nsectors) == 0) { 1315 error = EINVAL; 1316 goto close_and_exit; 1317 } 1318 1319 /* 1320 * Compute the size (in DEV_BSIZE blocks) specified 1321 * by the geometry. 1322 */ 1323 geomsize = (int64_t)vnd->sc_geom.vng_nsectors * 1324 vnd->sc_geom.vng_ntracks * 1325 vnd->sc_geom.vng_ncylinders * 1326 (vnd->sc_geom.vng_secsize / DEV_BSIZE); 1327 1328 /* 1329 * Sanity-check the size against the specified 1330 * geometry. 1331 */ 1332 if (vnd->sc_size < geomsize) { 1333 error = EINVAL; 1334 goto close_and_exit; 1335 } 1336 } else if (vnd->sc_size >= (32 * 64)) { 1337 /* 1338 * Size must be at least 2048 DEV_BSIZE blocks 1339 * (1M) in order to use this geometry. 1340 */ 1341 vnd->sc_geom.vng_secsize = DEV_BSIZE; 1342 vnd->sc_geom.vng_nsectors = 32; 1343 vnd->sc_geom.vng_ntracks = 64; 1344 vnd->sc_geom.vng_ncylinders = vnd->sc_size / (64 * 32); 1345 } else { 1346 vnd->sc_geom.vng_secsize = DEV_BSIZE; 1347 vnd->sc_geom.vng_nsectors = 1; 1348 vnd->sc_geom.vng_ntracks = 1; 1349 vnd->sc_geom.vng_ncylinders = vnd->sc_size; 1350 } 1351 1352 vnd_set_geometry(vnd); 1353 1354 if (vio->vnd_flags & VNDIOF_READONLY) { 1355 vnd->sc_flags |= VNF_READONLY; 1356 } 1357 1358 if ((error = vndsetcred(vnd, l->l_cred)) != 0) 1359 goto close_and_exit; 1360 1361 vndthrottle(vnd, vnd->sc_vp); 1362 vio->vnd_osize = dbtob(vnd->sc_size); 1363 #ifdef VNDIOCSET50 1364 if (cmd != VNDIOCSET50) 1365 #endif 1366 vio->vnd_size = dbtob(vnd->sc_size); 1367 vnd->sc_flags |= VNF_INITED; 1368 1369 /* create the kernel thread, wait for it to be up */ 1370 error = kthread_create(PRI_NONE, 0, NULL, vndthread, vnd, 1371 &vnd->sc_kthread, "%s", device_xname(vnd->sc_dev)); 1372 if (error) 1373 goto close_and_exit; 1374 while ((vnd->sc_flags & VNF_KTHREAD) == 0) { 1375 tsleep(&vnd->sc_kthread, PRIBIO, "vndthr", 0); 1376 } 1377 #ifdef DEBUG 1378 if (vnddebug & VDB_INIT) 1379 printf("vndioctl: SET vp %p size 0x%lx %d/%d/%d/%d\n", 1380 vnd->sc_vp, (unsigned long) vnd->sc_size, 1381 vnd->sc_geom.vng_secsize, 1382 vnd->sc_geom.vng_nsectors, 1383 vnd->sc_geom.vng_ntracks, 1384 vnd->sc_geom.vng_ncylinders); 1385 #endif 1386 1387 /* Attach the disk. */ 1388 disk_attach(&vnd->sc_dkdev); 1389 1390 /* Initialize the xfer and buffer pools. */ 1391 pool_init(&vnd->sc_vxpool, sizeof(struct vndxfer), 0, 1392 0, 0, "vndxpl", NULL, IPL_BIO); 1393 1394 vndunlock(vnd); 1395 1396 pathbuf_destroy(pb); 1397 1398 /* Discover wedges on this disk */ 1399 dkwedge_discover(&vnd->sc_dkdev); 1400 1401 break; 1402 1403 close_and_exit: 1404 (void) vn_close(nd.ni_vp, fflags, l->l_cred); 1405 pathbuf_destroy(pb); 1406 unlock_and_exit: 1407 #ifdef VND_COMPRESSION 1408 /* free any allocated memory (for compressed file) */ 1409 if (vnd->sc_comp_offsets) { 1410 free(vnd->sc_comp_offsets, M_DEVBUF); 1411 vnd->sc_comp_offsets = NULL; 1412 } 1413 if (vnd->sc_comp_buff) { 1414 free(vnd->sc_comp_buff, M_DEVBUF); 1415 vnd->sc_comp_buff = NULL; 1416 } 1417 if (vnd->sc_comp_decombuf) { 1418 free(vnd->sc_comp_decombuf, M_DEVBUF); 1419 vnd->sc_comp_decombuf = NULL; 1420 } 1421 #endif /* VND_COMPRESSION */ 1422 vndunlock(vnd); 1423 return error; 1424 1425 #ifdef VNDIOCCLR50 1426 case VNDIOCCLR50: 1427 #endif 1428 case VNDIOCCLR: 1429 part = DISKPART(dev); 1430 pmask = (1 << part); 1431 force = (vio->vnd_flags & VNDIOF_FORCE) != 0; 1432 1433 if ((error = vnddoclear(vnd, pmask, minor(dev), force)) != 0) 1434 return error; 1435 1436 break; 1437 1438 #ifdef COMPAT_30 1439 case VNDIOCGET30: { 1440 struct vnd_user30 *vnu; 1441 struct vattr va; 1442 vnu = (struct vnd_user30 *)data; 1443 KASSERT(l); 1444 switch (error = vnd_cget(l, unit, &vnu->vnu_unit, &va)) { 1445 case 0: 1446 vnu->vnu_dev = va.va_fsid; 1447 vnu->vnu_ino = va.va_fileid; 1448 break; 1449 case -1: 1450 /* unused is not an error */ 1451 vnu->vnu_dev = 0; 1452 vnu->vnu_ino = 0; 1453 break; 1454 default: 1455 return error; 1456 } 1457 break; 1458 } 1459 #endif 1460 1461 #ifdef COMPAT_50 1462 case VNDIOCGET50: { 1463 struct vnd_user50 *vnu; 1464 struct vattr va; 1465 vnu = (struct vnd_user50 *)data; 1466 KASSERT(l); 1467 switch (error = vnd_cget(l, unit, &vnu->vnu_unit, &va)) { 1468 case 0: 1469 vnu->vnu_dev = va.va_fsid; 1470 vnu->vnu_ino = va.va_fileid; 1471 break; 1472 case -1: 1473 /* unused is not an error */ 1474 vnu->vnu_dev = 0; 1475 vnu->vnu_ino = 0; 1476 break; 1477 default: 1478 return error; 1479 } 1480 break; 1481 } 1482 #endif 1483 1484 case VNDIOCGET: { 1485 struct vnd_user *vnu; 1486 struct vattr va; 1487 vnu = (struct vnd_user *)data; 1488 KASSERT(l); 1489 switch (error = vnd_cget(l, unit, &vnu->vnu_unit, &va)) { 1490 case 0: 1491 vnu->vnu_dev = va.va_fsid; 1492 vnu->vnu_ino = va.va_fileid; 1493 break; 1494 case -1: 1495 /* unused is not an error */ 1496 vnu->vnu_dev = 0; 1497 vnu->vnu_ino = 0; 1498 break; 1499 default: 1500 return error; 1501 } 1502 break; 1503 } 1504 1505 case DIOCWDINFO: 1506 case DIOCSDINFO: 1507 #ifdef __HAVE_OLD_DISKLABEL 1508 case ODIOCWDINFO: 1509 case ODIOCSDINFO: 1510 #endif 1511 { 1512 struct disklabel *lp; 1513 1514 if ((error = vndlock(vnd)) != 0) 1515 return error; 1516 1517 vnd->sc_flags |= VNF_LABELLING; 1518 1519 #ifdef __HAVE_OLD_DISKLABEL 1520 if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) { 1521 memset(&newlabel, 0, sizeof newlabel); 1522 memcpy(&newlabel, data, sizeof (struct olddisklabel)); 1523 lp = &newlabel; 1524 } else 1525 #endif 1526 lp = (struct disklabel *)data; 1527 1528 error = setdisklabel(vnd->sc_dkdev.dk_label, 1529 lp, 0, vnd->sc_dkdev.dk_cpulabel); 1530 if (error == 0) { 1531 if (cmd == DIOCWDINFO 1532 #ifdef __HAVE_OLD_DISKLABEL 1533 || cmd == ODIOCWDINFO 1534 #endif 1535 ) 1536 error = writedisklabel(VNDLABELDEV(dev), 1537 vndstrategy, vnd->sc_dkdev.dk_label, 1538 vnd->sc_dkdev.dk_cpulabel); 1539 } 1540 1541 vnd->sc_flags &= ~VNF_LABELLING; 1542 1543 vndunlock(vnd); 1544 1545 if (error) 1546 return error; 1547 break; 1548 } 1549 1550 case DIOCKLABEL: 1551 if (*(int *)data != 0) 1552 vnd->sc_flags |= VNF_KLABEL; 1553 else 1554 vnd->sc_flags &= ~VNF_KLABEL; 1555 break; 1556 1557 case DIOCWLABEL: 1558 if (*(int *)data != 0) 1559 vnd->sc_flags |= VNF_WLABEL; 1560 else 1561 vnd->sc_flags &= ~VNF_WLABEL; 1562 break; 1563 1564 case DIOCGDEFLABEL: 1565 vndgetdefaultlabel(vnd, (struct disklabel *)data); 1566 break; 1567 1568 #ifdef __HAVE_OLD_DISKLABEL 1569 case ODIOCGDEFLABEL: 1570 vndgetdefaultlabel(vnd, &newlabel); 1571 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 1572 return ENOTTY; 1573 memcpy(data, &newlabel, sizeof (struct olddisklabel)); 1574 break; 1575 #endif 1576 1577 case DIOCCACHESYNC: 1578 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 1579 error = VOP_FSYNC(vnd->sc_vp, vnd->sc_cred, 1580 FSYNC_WAIT | FSYNC_DATAONLY | FSYNC_CACHE, 0, 0); 1581 VOP_UNLOCK(vnd->sc_vp); 1582 return error; 1583 1584 default: 1585 return ENOTTY; 1586 } 1587 1588 return 0; 1589 } 1590 1591 /* 1592 * Duplicate the current processes' credentials. Since we are called only 1593 * as the result of a SET ioctl and only root can do that, any future access 1594 * to this "disk" is essentially as root. Note that credentials may change 1595 * if some other uid can write directly to the mapped file (NFS). 1596 */ 1597 static int 1598 vndsetcred(struct vnd_softc *vnd, kauth_cred_t cred) 1599 { 1600 struct uio auio; 1601 struct iovec aiov; 1602 char *tmpbuf; 1603 int error; 1604 1605 vnd->sc_cred = kauth_cred_dup(cred); 1606 tmpbuf = malloc(DEV_BSIZE, M_TEMP, M_WAITOK); 1607 1608 /* XXX: Horrible kludge to establish credentials for NFS */ 1609 aiov.iov_base = tmpbuf; 1610 aiov.iov_len = min(DEV_BSIZE, dbtob(vnd->sc_size)); 1611 auio.uio_iov = &aiov; 1612 auio.uio_iovcnt = 1; 1613 auio.uio_offset = 0; 1614 auio.uio_rw = UIO_READ; 1615 auio.uio_resid = aiov.iov_len; 1616 UIO_SETUP_SYSSPACE(&auio); 1617 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 1618 error = VOP_READ(vnd->sc_vp, &auio, 0, vnd->sc_cred); 1619 if (error == 0) { 1620 /* 1621 * Because vnd does all IO directly through the vnode 1622 * we need to flush (at least) the buffer from the above 1623 * VOP_READ from the buffer cache to prevent cache 1624 * incoherencies. Also, be careful to write dirty 1625 * buffers back to stable storage. 1626 */ 1627 error = vinvalbuf(vnd->sc_vp, V_SAVE, vnd->sc_cred, 1628 curlwp, 0, 0); 1629 } 1630 VOP_UNLOCK(vnd->sc_vp); 1631 1632 free(tmpbuf, M_TEMP); 1633 return error; 1634 } 1635 1636 /* 1637 * Set maxactive based on FS type 1638 */ 1639 static void 1640 vndthrottle(struct vnd_softc *vnd, struct vnode *vp) 1641 { 1642 1643 if (vp->v_tag == VT_NFS) 1644 vnd->sc_maxactive = 2; 1645 else 1646 vnd->sc_maxactive = 8; 1647 1648 if (vnd->sc_maxactive < 1) 1649 vnd->sc_maxactive = 1; 1650 } 1651 1652 #if 0 1653 static void 1654 vndshutdown(void) 1655 { 1656 struct vnd_softc *vnd; 1657 1658 for (vnd = &vnd_softc[0]; vnd < &vnd_softc[numvnd]; vnd++) 1659 if (vnd->sc_flags & VNF_INITED) 1660 vndclear(vnd); 1661 } 1662 #endif 1663 1664 static void 1665 vndclear(struct vnd_softc *vnd, int myminor) 1666 { 1667 struct vnode *vp = vnd->sc_vp; 1668 int fflags = FREAD; 1669 int bmaj, cmaj, i, mn; 1670 int s; 1671 1672 #ifdef DEBUG 1673 if (vnddebug & VDB_FOLLOW) 1674 printf("vndclear(%p): vp %p\n", vnd, vp); 1675 #endif 1676 /* locate the major number */ 1677 bmaj = bdevsw_lookup_major(&vnd_bdevsw); 1678 cmaj = cdevsw_lookup_major(&vnd_cdevsw); 1679 1680 /* Nuke the vnodes for any open instances */ 1681 for (i = 0; i < MAXPARTITIONS; i++) { 1682 mn = DISKMINOR(device_unit(vnd->sc_dev), i); 1683 vdevgone(bmaj, mn, mn, VBLK); 1684 if (mn != myminor) /* XXX avoid to kill own vnode */ 1685 vdevgone(cmaj, mn, mn, VCHR); 1686 } 1687 1688 if ((vnd->sc_flags & VNF_READONLY) == 0) 1689 fflags |= FWRITE; 1690 1691 s = splbio(); 1692 bufq_drain(vnd->sc_tab); 1693 splx(s); 1694 1695 vnd->sc_flags |= VNF_VUNCONF; 1696 wakeup(&vnd->sc_tab); 1697 while (vnd->sc_flags & VNF_KTHREAD) 1698 tsleep(&vnd->sc_kthread, PRIBIO, "vnthr", 0); 1699 1700 #ifdef VND_COMPRESSION 1701 /* free the compressed file buffers */ 1702 if (vnd->sc_flags & VNF_COMP) { 1703 if (vnd->sc_comp_offsets) { 1704 free(vnd->sc_comp_offsets, M_DEVBUF); 1705 vnd->sc_comp_offsets = NULL; 1706 } 1707 if (vnd->sc_comp_buff) { 1708 free(vnd->sc_comp_buff, M_DEVBUF); 1709 vnd->sc_comp_buff = NULL; 1710 } 1711 if (vnd->sc_comp_decombuf) { 1712 free(vnd->sc_comp_decombuf, M_DEVBUF); 1713 vnd->sc_comp_decombuf = NULL; 1714 } 1715 } 1716 #endif /* VND_COMPRESSION */ 1717 vnd->sc_flags &= 1718 ~(VNF_INITED | VNF_READONLY | VNF_KLABEL | VNF_VLABEL 1719 | VNF_VUNCONF | VNF_COMP | VNF_CLEARING); 1720 if (vp == NULL) 1721 panic("vndclear: null vp"); 1722 (void) vn_close(vp, fflags, vnd->sc_cred); 1723 kauth_cred_free(vnd->sc_cred); 1724 vnd->sc_vp = NULL; 1725 vnd->sc_cred = NULL; 1726 vnd->sc_size = 0; 1727 } 1728 1729 static int 1730 vndsize(dev_t dev) 1731 { 1732 struct vnd_softc *sc; 1733 struct disklabel *lp; 1734 int part, unit, omask; 1735 int size; 1736 1737 unit = vndunit(dev); 1738 sc = device_lookup_private(&vnd_cd, unit); 1739 if (sc == NULL) 1740 return -1; 1741 1742 if ((sc->sc_flags & VNF_INITED) == 0) 1743 return -1; 1744 1745 part = DISKPART(dev); 1746 omask = sc->sc_dkdev.dk_openmask & (1 << part); 1747 lp = sc->sc_dkdev.dk_label; 1748 1749 if (omask == 0 && vndopen(dev, 0, S_IFBLK, curlwp)) /* XXX */ 1750 return -1; 1751 1752 if (lp->d_partitions[part].p_fstype != FS_SWAP) 1753 size = -1; 1754 else 1755 size = lp->d_partitions[part].p_size * 1756 (lp->d_secsize / DEV_BSIZE); 1757 1758 if (omask == 0 && vndclose(dev, 0, S_IFBLK, curlwp)) /* XXX */ 1759 return -1; 1760 1761 return size; 1762 } 1763 1764 static int 1765 vnddump(dev_t dev, daddr_t blkno, void *va, 1766 size_t size) 1767 { 1768 1769 /* Not implemented. */ 1770 return ENXIO; 1771 } 1772 1773 static void 1774 vndgetdefaultlabel(struct vnd_softc *sc, struct disklabel *lp) 1775 { 1776 struct vndgeom *vng = &sc->sc_geom; 1777 struct partition *pp; 1778 unsigned spb; 1779 1780 memset(lp, 0, sizeof(*lp)); 1781 1782 spb = vng->vng_secsize / DEV_BSIZE; 1783 if (sc->sc_size / spb > UINT32_MAX) 1784 lp->d_secperunit = UINT32_MAX; 1785 else 1786 lp->d_secperunit = sc->sc_size / spb; 1787 lp->d_secsize = vng->vng_secsize; 1788 lp->d_nsectors = vng->vng_nsectors; 1789 lp->d_ntracks = vng->vng_ntracks; 1790 lp->d_ncylinders = vng->vng_ncylinders; 1791 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 1792 1793 strncpy(lp->d_typename, "vnd", sizeof(lp->d_typename)); 1794 lp->d_type = DKTYPE_VND; 1795 strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname)); 1796 lp->d_rpm = 3600; 1797 lp->d_interleave = 1; 1798 lp->d_flags = 0; 1799 1800 pp = &lp->d_partitions[RAW_PART]; 1801 pp->p_offset = 0; 1802 pp->p_size = lp->d_secperunit; 1803 pp->p_fstype = FS_UNUSED; 1804 lp->d_npartitions = RAW_PART + 1; 1805 1806 lp->d_magic = DISKMAGIC; 1807 lp->d_magic2 = DISKMAGIC; 1808 lp->d_checksum = dkcksum(lp); 1809 } 1810 1811 /* 1812 * Read the disklabel from a vnd. If one is not present, create a fake one. 1813 */ 1814 static void 1815 vndgetdisklabel(dev_t dev, struct vnd_softc *sc) 1816 { 1817 const char *errstring; 1818 struct disklabel *lp = sc->sc_dkdev.dk_label; 1819 struct cpu_disklabel *clp = sc->sc_dkdev.dk_cpulabel; 1820 int i; 1821 1822 memset(clp, 0, sizeof(*clp)); 1823 1824 vndgetdefaultlabel(sc, lp); 1825 1826 /* 1827 * Call the generic disklabel extraction routine. 1828 */ 1829 errstring = readdisklabel(VNDLABELDEV(dev), vndstrategy, lp, clp); 1830 if (errstring) { 1831 /* 1832 * Lack of disklabel is common, but we print the warning 1833 * anyway, since it might contain other useful information. 1834 */ 1835 aprint_normal_dev(sc->sc_dev, "%s\n", errstring); 1836 1837 /* 1838 * For historical reasons, if there's no disklabel 1839 * present, all partitions must be FS_BSDFFS and 1840 * occupy the entire disk. 1841 */ 1842 for (i = 0; i < MAXPARTITIONS; i++) { 1843 /* 1844 * Don't wipe out port specific hack (such as 1845 * dos partition hack of i386 port). 1846 */ 1847 if (lp->d_partitions[i].p_size != 0) 1848 continue; 1849 1850 lp->d_partitions[i].p_size = lp->d_secperunit; 1851 lp->d_partitions[i].p_offset = 0; 1852 lp->d_partitions[i].p_fstype = FS_BSDFFS; 1853 } 1854 1855 strncpy(lp->d_packname, "default label", 1856 sizeof(lp->d_packname)); 1857 1858 lp->d_npartitions = MAXPARTITIONS; 1859 lp->d_checksum = dkcksum(lp); 1860 } 1861 } 1862 1863 /* 1864 * Wait interruptibly for an exclusive lock. 1865 * 1866 * XXX 1867 * Several drivers do this; it should be abstracted and made MP-safe. 1868 */ 1869 static int 1870 vndlock(struct vnd_softc *sc) 1871 { 1872 int error; 1873 1874 while ((sc->sc_flags & VNF_LOCKED) != 0) { 1875 sc->sc_flags |= VNF_WANTED; 1876 if ((error = tsleep(sc, PRIBIO | PCATCH, "vndlck", 0)) != 0) 1877 return error; 1878 } 1879 sc->sc_flags |= VNF_LOCKED; 1880 return 0; 1881 } 1882 1883 /* 1884 * Unlock and wake up any waiters. 1885 */ 1886 static void 1887 vndunlock(struct vnd_softc *sc) 1888 { 1889 1890 sc->sc_flags &= ~VNF_LOCKED; 1891 if ((sc->sc_flags & VNF_WANTED) != 0) { 1892 sc->sc_flags &= ~VNF_WANTED; 1893 wakeup(sc); 1894 } 1895 } 1896 1897 #ifdef VND_COMPRESSION 1898 /* compressed file read */ 1899 static void 1900 compstrategy(struct buf *bp, off_t bn) 1901 { 1902 int error; 1903 int unit = vndunit(bp->b_dev); 1904 struct vnd_softc *vnd = 1905 device_lookup_private(&vnd_cd, unit); 1906 u_int32_t comp_block; 1907 struct uio auio; 1908 char *addr; 1909 int s; 1910 1911 /* set up constants for data move */ 1912 auio.uio_rw = UIO_READ; 1913 UIO_SETUP_SYSSPACE(&auio); 1914 1915 /* read, and transfer the data */ 1916 addr = bp->b_data; 1917 bp->b_resid = bp->b_bcount; 1918 s = splbio(); 1919 while (bp->b_resid > 0) { 1920 unsigned length; 1921 size_t length_in_buffer; 1922 u_int32_t offset_in_buffer; 1923 struct iovec aiov; 1924 1925 /* calculate the compressed block number */ 1926 comp_block = bn / (off_t)vnd->sc_comp_blksz; 1927 1928 /* check for good block number */ 1929 if (comp_block >= vnd->sc_comp_numoffs) { 1930 bp->b_error = EINVAL; 1931 splx(s); 1932 return; 1933 } 1934 1935 /* read in the compressed block, if not in buffer */ 1936 if (comp_block != vnd->sc_comp_buffblk) { 1937 length = vnd->sc_comp_offsets[comp_block + 1] - 1938 vnd->sc_comp_offsets[comp_block]; 1939 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 1940 error = vn_rdwr(UIO_READ, vnd->sc_vp, vnd->sc_comp_buff, 1941 length, vnd->sc_comp_offsets[comp_block], 1942 UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, vnd->sc_cred, 1943 NULL, NULL); 1944 if (error) { 1945 bp->b_error = error; 1946 VOP_UNLOCK(vnd->sc_vp); 1947 splx(s); 1948 return; 1949 } 1950 /* uncompress the buffer */ 1951 vnd->sc_comp_stream.next_in = vnd->sc_comp_buff; 1952 vnd->sc_comp_stream.avail_in = length; 1953 vnd->sc_comp_stream.next_out = vnd->sc_comp_decombuf; 1954 vnd->sc_comp_stream.avail_out = vnd->sc_comp_blksz; 1955 inflateReset(&vnd->sc_comp_stream); 1956 error = inflate(&vnd->sc_comp_stream, Z_FINISH); 1957 if (error != Z_STREAM_END) { 1958 if (vnd->sc_comp_stream.msg) 1959 aprint_normal_dev(vnd->sc_dev, 1960 "compressed file, %s\n", 1961 vnd->sc_comp_stream.msg); 1962 bp->b_error = EBADMSG; 1963 VOP_UNLOCK(vnd->sc_vp); 1964 splx(s); 1965 return; 1966 } 1967 vnd->sc_comp_buffblk = comp_block; 1968 VOP_UNLOCK(vnd->sc_vp); 1969 } 1970 1971 /* transfer the usable uncompressed data */ 1972 offset_in_buffer = bn % (off_t)vnd->sc_comp_blksz; 1973 length_in_buffer = vnd->sc_comp_blksz - offset_in_buffer; 1974 if (length_in_buffer > bp->b_resid) 1975 length_in_buffer = bp->b_resid; 1976 auio.uio_iov = &aiov; 1977 auio.uio_iovcnt = 1; 1978 aiov.iov_base = addr; 1979 aiov.iov_len = length_in_buffer; 1980 auio.uio_resid = aiov.iov_len; 1981 auio.uio_offset = 0; 1982 error = uiomove(vnd->sc_comp_decombuf + offset_in_buffer, 1983 length_in_buffer, &auio); 1984 if (error) { 1985 bp->b_error = error; 1986 splx(s); 1987 return; 1988 } 1989 1990 bn += length_in_buffer; 1991 addr += length_in_buffer; 1992 bp->b_resid -= length_in_buffer; 1993 } 1994 splx(s); 1995 } 1996 1997 /* compression memory allocation routines */ 1998 static void * 1999 vnd_alloc(void *aux, u_int items, u_int siz) 2000 { 2001 return malloc(items * siz, M_TEMP, M_NOWAIT); 2002 } 2003 2004 static void 2005 vnd_free(void *aux, void *ptr) 2006 { 2007 free(ptr, M_TEMP); 2008 } 2009 #endif /* VND_COMPRESSION */ 2010 2011 static void 2012 vnd_set_geometry(struct vnd_softc *vnd) 2013 { 2014 struct disk_geom *dg = &vnd->sc_dkdev.dk_geom; 2015 2016 memset(dg, 0, sizeof(*dg)); 2017 2018 dg->dg_secperunit = (int64_t)vnd->sc_geom.vng_nsectors * 2019 vnd->sc_geom.vng_ntracks * vnd->sc_geom.vng_ncylinders; 2020 dg->dg_secsize = vnd->sc_geom.vng_secsize; 2021 dg->dg_nsectors = vnd->sc_geom.vng_nsectors; 2022 dg->dg_ntracks = vnd->sc_geom.vng_ntracks; 2023 dg->dg_ncylinders = vnd->sc_geom.vng_ncylinders; 2024 2025 #ifdef DEBUG 2026 if (vnddebug & VDB_LABEL) { 2027 printf("dg->dg_secperunit: %" PRId64 "\n", dg->dg_secperunit); 2028 printf("dg->dg_ncylinders: %u\n", dg->dg_ncylinders); 2029 } 2030 #endif 2031 disk_set_info(vnd->sc_dev, &vnd->sc_dkdev, NULL); 2032 } 2033 2034 #ifdef _MODULE 2035 2036 #include <sys/module.h> 2037 2038 #ifdef VND_COMPRESSION 2039 #define VND_DEPENDS "zlib" 2040 #else 2041 #define VND_DEPENDS NULL 2042 #endif 2043 2044 MODULE(MODULE_CLASS_DRIVER, vnd, VND_DEPENDS); 2045 CFDRIVER_DECL(vnd, DV_DISK, NULL); 2046 2047 static int 2048 vnd_modcmd(modcmd_t cmd, void *arg) 2049 { 2050 int bmajor = -1, cmajor = -1, error = 0; 2051 2052 switch (cmd) { 2053 case MODULE_CMD_INIT: 2054 error = config_cfdriver_attach(&vnd_cd); 2055 if (error) 2056 break; 2057 2058 error = config_cfattach_attach(vnd_cd.cd_name, &vnd_ca); 2059 if (error) { 2060 config_cfdriver_detach(&vnd_cd); 2061 aprint_error("%s: unable to register cfattach\n", 2062 vnd_cd.cd_name); 2063 break; 2064 } 2065 2066 error = devsw_attach("vnd", &vnd_bdevsw, &bmajor, 2067 &vnd_cdevsw, &cmajor); 2068 if (error) { 2069 config_cfattach_detach(vnd_cd.cd_name, &vnd_ca); 2070 config_cfdriver_detach(&vnd_cd); 2071 break; 2072 } 2073 2074 break; 2075 2076 case MODULE_CMD_FINI: 2077 error = config_cfattach_detach(vnd_cd.cd_name, &vnd_ca); 2078 if (error) 2079 break; 2080 config_cfdriver_detach(&vnd_cd); 2081 devsw_detach(&vnd_bdevsw, &vnd_cdevsw); 2082 break; 2083 2084 case MODULE_CMD_STAT: 2085 return ENOTTY; 2086 2087 default: 2088 return ENOTTY; 2089 } 2090 2091 return error; 2092 } 2093 2094 #endif 2095
Indexes created Mon Sep 29 21:09:56 GMT 2025