vnd.c revision 1.228
1 /* $NetBSD: vnd.c,v 1.228 2014/03/16 05:20:26 dholland 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 1.228 2014/03/16 05:20:26 dholland 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 #if defined(VNDDEBUG) && !defined(DEBUG) 131 #define DEBUG 132 #endif 133 134 #ifdef DEBUG 135 int dovndcluster = 1; 136 #define VDB_FOLLOW 0x01 137 #define VDB_INIT 0x02 138 #define VDB_IO 0x04 139 #define VDB_LABEL 0x08 140 int vnddebug = 0x00; 141 #endif 142 143 #define vndunit(x) DISKUNIT(x) 144 145 struct vndxfer { 146 struct buf vx_buf; 147 struct vnd_softc *vx_vnd; 148 }; 149 #define VND_BUFTOXFER(bp) ((struct vndxfer *)(void *)bp) 150 151 #define VND_GETXFER(vnd) pool_get(&(vnd)->sc_vxpool, PR_WAITOK) 152 #define VND_PUTXFER(vnd, vx) pool_put(&(vnd)->sc_vxpool, (vx)) 153 154 #define VNDLABELDEV(dev) \ 155 (MAKEDISKDEV(major((dev)), vndunit((dev)), RAW_PART)) 156 157 #define VND_MAXPENDING(vnd) ((vnd)->sc_maxactive * 4) 158 159 /* called by main() at boot time */ 160 void vndattach(int); 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_flag = D_DISK 207 }; 208 209 const struct cdevsw vnd_cdevsw = { 210 .d_open = vndopen, 211 .d_close = vndclose, 212 .d_read = vndread, 213 .d_write = vndwrite, 214 .d_ioctl = vndioctl, 215 .d_stop = nostop, 216 .d_tty = notty, 217 .d_poll = nopoll, 218 .d_mmap = nommap, 219 .d_kqfilter = nokqfilter, 220 .d_flag = D_DISK 221 }; 222 223 static int vnd_match(device_t, cfdata_t, void *); 224 static void vnd_attach(device_t, device_t, void *); 225 static int vnd_detach(device_t, int); 226 227 CFATTACH_DECL3_NEW(vnd, sizeof(struct vnd_softc), 228 vnd_match, vnd_attach, vnd_detach, NULL, NULL, NULL, DVF_DETACH_SHUTDOWN); 229 extern struct cfdriver vnd_cd; 230 231 static struct vnd_softc *vnd_spawn(int); 232 int vnd_destroy(device_t); 233 234 static struct dkdriver vnddkdriver = { vndstrategy, minphys }; 235 236 void 237 vndattach(int num) 238 { 239 int error; 240 241 error = config_cfattach_attach(vnd_cd.cd_name, &vnd_ca); 242 if (error) 243 aprint_error("%s: unable to register cfattach\n", 244 vnd_cd.cd_name); 245 } 246 247 static int 248 vnd_match(device_t self, cfdata_t cfdata, void *aux) 249 { 250 251 return 1; 252 } 253 254 static void 255 vnd_attach(device_t parent, device_t self, void *aux) 256 { 257 struct vnd_softc *sc = device_private(self); 258 259 sc->sc_dev = self; 260 sc->sc_comp_offsets = NULL; 261 sc->sc_comp_buff = NULL; 262 sc->sc_comp_decombuf = NULL; 263 bufq_alloc(&sc->sc_tab, "disksort", BUFQ_SORT_RAWBLOCK); 264 disk_init(&sc->sc_dkdev, device_xname(self), &vnddkdriver); 265 if (!pmf_device_register(self, NULL, NULL)) 266 aprint_error_dev(self, "couldn't establish power handler\n"); 267 } 268 269 static int 270 vnd_detach(device_t self, int flags) 271 { 272 int error; 273 struct vnd_softc *sc = device_private(self); 274 275 if (sc->sc_flags & VNF_INITED) { 276 error = vnddoclear(sc, 0, -1, (flags & DETACH_FORCE) != 0); 277 if (error != 0) 278 return error; 279 } 280 281 pmf_device_deregister(self); 282 bufq_free(sc->sc_tab); 283 disk_destroy(&sc->sc_dkdev); 284 285 return 0; 286 } 287 288 static struct vnd_softc * 289 vnd_spawn(int unit) 290 { 291 cfdata_t cf; 292 293 cf = malloc(sizeof(*cf), M_DEVBUF, M_WAITOK); 294 cf->cf_name = vnd_cd.cd_name; 295 cf->cf_atname = vnd_cd.cd_name; 296 cf->cf_unit = unit; 297 cf->cf_fstate = FSTATE_STAR; 298 299 return device_private(config_attach_pseudo(cf)); 300 } 301 302 int 303 vnd_destroy(device_t dev) 304 { 305 int error; 306 cfdata_t cf; 307 308 cf = device_cfdata(dev); 309 error = config_detach(dev, DETACH_QUIET); 310 if (error) 311 return error; 312 free(cf, M_DEVBUF); 313 return 0; 314 } 315 316 static int 317 vndopen(dev_t dev, int flags, int mode, struct lwp *l) 318 { 319 int unit = vndunit(dev); 320 struct vnd_softc *sc; 321 int error = 0, part, pmask; 322 struct disklabel *lp; 323 324 #ifdef DEBUG 325 if (vnddebug & VDB_FOLLOW) 326 printf("vndopen(0x%"PRIx64", 0x%x, 0x%x, %p)\n", dev, flags, mode, l); 327 #endif 328 sc = device_lookup_private(&vnd_cd, unit); 329 if (sc == NULL) { 330 sc = vnd_spawn(unit); 331 if (sc == NULL) 332 return ENOMEM; 333 } 334 335 if ((error = vndlock(sc)) != 0) 336 return error; 337 338 if ((sc->sc_flags & VNF_CLEARING) != 0) { 339 error = ENXIO; 340 goto done; 341 } 342 343 lp = sc->sc_dkdev.dk_label; 344 345 part = DISKPART(dev); 346 pmask = (1 << part); 347 348 if (sc->sc_dkdev.dk_nwedges != 0 && part != RAW_PART) { 349 error = EBUSY; 350 goto done; 351 } 352 353 if (sc->sc_flags & VNF_INITED) { 354 if ((sc->sc_dkdev.dk_openmask & ~(1<<RAW_PART)) != 0) { 355 /* 356 * If any non-raw partition is open, but the disk 357 * has been invalidated, disallow further opens. 358 */ 359 if ((sc->sc_flags & VNF_VLABEL) == 0) { 360 error = EIO; 361 goto done; 362 } 363 } else { 364 /* 365 * Load the partition info if not already loaded. 366 */ 367 if ((sc->sc_flags & VNF_VLABEL) == 0) { 368 sc->sc_flags |= VNF_VLABEL; 369 vndgetdisklabel(dev, sc); 370 } 371 } 372 } 373 374 /* Check that the partitions exists. */ 375 if (part != RAW_PART) { 376 if (((sc->sc_flags & VNF_INITED) == 0) || 377 ((part >= lp->d_npartitions) || 378 (lp->d_partitions[part].p_fstype == FS_UNUSED))) { 379 error = ENXIO; 380 goto done; 381 } 382 } 383 384 /* Prevent our unit from being unconfigured while open. */ 385 switch (mode) { 386 case S_IFCHR: 387 sc->sc_dkdev.dk_copenmask |= pmask; 388 break; 389 390 case S_IFBLK: 391 sc->sc_dkdev.dk_bopenmask |= pmask; 392 break; 393 } 394 sc->sc_dkdev.dk_openmask = 395 sc->sc_dkdev.dk_copenmask | sc->sc_dkdev.dk_bopenmask; 396 397 done: 398 vndunlock(sc); 399 return error; 400 } 401 402 static int 403 vndclose(dev_t dev, int flags, int mode, struct lwp *l) 404 { 405 int unit = vndunit(dev); 406 struct vnd_softc *sc; 407 int error = 0, part; 408 409 #ifdef DEBUG 410 if (vnddebug & VDB_FOLLOW) 411 printf("vndclose(0x%"PRIx64", 0x%x, 0x%x, %p)\n", dev, flags, mode, l); 412 #endif 413 sc = device_lookup_private(&vnd_cd, unit); 414 if (sc == NULL) 415 return ENXIO; 416 417 if ((error = vndlock(sc)) != 0) 418 return error; 419 420 part = DISKPART(dev); 421 422 /* ...that much closer to allowing unconfiguration... */ 423 switch (mode) { 424 case S_IFCHR: 425 sc->sc_dkdev.dk_copenmask &= ~(1 << part); 426 break; 427 428 case S_IFBLK: 429 sc->sc_dkdev.dk_bopenmask &= ~(1 << part); 430 break; 431 } 432 sc->sc_dkdev.dk_openmask = 433 sc->sc_dkdev.dk_copenmask | sc->sc_dkdev.dk_bopenmask; 434 435 vndunlock(sc); 436 437 if ((sc->sc_flags & VNF_INITED) == 0) { 438 if ((error = vnd_destroy(sc->sc_dev)) != 0) { 439 aprint_error_dev(sc->sc_dev, 440 "unable to detach instance\n"); 441 return error; 442 } 443 } 444 445 return 0; 446 } 447 448 /* 449 * Queue the request, and wakeup the kernel thread to handle it. 450 */ 451 static void 452 vndstrategy(struct buf *bp) 453 { 454 int unit = vndunit(bp->b_dev); 455 struct vnd_softc *vnd = 456 device_lookup_private(&vnd_cd, unit); 457 struct disklabel *lp; 458 daddr_t blkno; 459 int s = splbio(); 460 461 if (vnd == NULL) { 462 bp->b_error = ENXIO; 463 goto done; 464 } 465 lp = vnd->sc_dkdev.dk_label; 466 467 if ((vnd->sc_flags & VNF_INITED) == 0) { 468 bp->b_error = ENXIO; 469 goto done; 470 } 471 472 /* 473 * The transfer must be a whole number of blocks. 474 */ 475 if ((bp->b_bcount % lp->d_secsize) != 0) { 476 bp->b_error = EINVAL; 477 goto done; 478 } 479 480 /* 481 * check if we're read-only. 482 */ 483 if ((vnd->sc_flags & VNF_READONLY) && !(bp->b_flags & B_READ)) { 484 bp->b_error = EACCES; 485 goto done; 486 } 487 488 /* If it's a nil transfer, wake up the top half now. */ 489 if (bp->b_bcount == 0) { 490 goto done; 491 } 492 493 /* 494 * Do bounds checking and adjust transfer. If there's an error, 495 * the bounds check will flag that for us. 496 */ 497 if (DISKPART(bp->b_dev) == RAW_PART) { 498 if (bounds_check_with_mediasize(bp, DEV_BSIZE, 499 vnd->sc_size) <= 0) 500 goto done; 501 } else { 502 if (bounds_check_with_label(&vnd->sc_dkdev, 503 bp, vnd->sc_flags & (VNF_WLABEL|VNF_LABELLING)) <= 0) 504 goto done; 505 } 506 507 /* 508 * Put the block number in terms of the logical blocksize 509 * of the "device". 510 */ 511 512 blkno = bp->b_blkno / (lp->d_secsize / DEV_BSIZE); 513 514 /* 515 * Translate the partition-relative block number to an absolute. 516 */ 517 if (DISKPART(bp->b_dev) != RAW_PART) { 518 struct partition *pp; 519 520 pp = &vnd->sc_dkdev.dk_label->d_partitions[ 521 DISKPART(bp->b_dev)]; 522 blkno += pp->p_offset; 523 } 524 bp->b_rawblkno = blkno; 525 526 #ifdef DEBUG 527 if (vnddebug & VDB_FOLLOW) 528 printf("vndstrategy(%p): unit %d\n", bp, unit); 529 #endif 530 if ((vnd->sc_flags & VNF_USE_VN_RDWR)) { 531 KASSERT(vnd->sc_pending >= 0 && 532 vnd->sc_pending <= VND_MAXPENDING(vnd)); 533 while (vnd->sc_pending == VND_MAXPENDING(vnd)) 534 tsleep(&vnd->sc_pending, PRIBIO, "vndpc", 0); 535 vnd->sc_pending++; 536 } 537 bufq_put(vnd->sc_tab, bp); 538 wakeup(&vnd->sc_tab); 539 splx(s); 540 return; 541 542 done: 543 bp->b_resid = bp->b_bcount; 544 biodone(bp); 545 splx(s); 546 } 547 548 static bool 549 vnode_has_strategy(struct vnd_softc *vnd) 550 { 551 return vnode_has_op(vnd->sc_vp, VOFFSET(vop_bmap)) && 552 vnode_has_op(vnd->sc_vp, VOFFSET(vop_strategy)); 553 } 554 555 /* XXX this function needs a reliable check to detect 556 * sparse files. Otherwise, bmap/strategy may be used 557 * and fail on non-allocated blocks. VOP_READ/VOP_WRITE 558 * works on sparse files. 559 */ 560 #if notyet 561 static bool 562 vnode_strategy_probe(struct vnd_softc *vnd) 563 { 564 int error; 565 daddr_t nbn; 566 567 if (!vnode_has_strategy(vnd)) 568 return false; 569 570 /* Convert the first logical block number to its 571 * physical block number. 572 */ 573 error = 0; 574 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 575 error = VOP_BMAP(vnd->sc_vp, 0, NULL, &nbn, NULL); 576 VOP_UNLOCK(vnd->sc_vp); 577 578 /* Test if that worked. */ 579 if (error == 0 && (long)nbn == -1) 580 return false; 581 582 return true; 583 } 584 #endif 585 586 static void 587 vndthread(void *arg) 588 { 589 struct vnd_softc *vnd = arg; 590 int s; 591 592 /* Determine whether we can *use* VOP_BMAP and VOP_STRATEGY to 593 * directly access the backing vnode. If we can, use these two 594 * operations to avoid messing with the local buffer cache. 595 * Otherwise fall back to regular VOP_READ/VOP_WRITE operations 596 * which are guaranteed to work with any file system. */ 597 if ((vnd->sc_flags & VNF_USE_VN_RDWR) == 0 && 598 ! vnode_has_strategy(vnd)) 599 vnd->sc_flags |= VNF_USE_VN_RDWR; 600 601 #ifdef DEBUG 602 if (vnddebug & VDB_INIT) 603 printf("vndthread: vp %p, %s\n", vnd->sc_vp, 604 (vnd->sc_flags & VNF_USE_VN_RDWR) == 0 ? 605 "using bmap/strategy operations" : 606 "using read/write operations"); 607 #endif 608 609 s = splbio(); 610 vnd->sc_flags |= VNF_KTHREAD; 611 wakeup(&vnd->sc_kthread); 612 613 /* 614 * Dequeue requests and serve them depending on the available 615 * vnode operations. 616 */ 617 while ((vnd->sc_flags & VNF_VUNCONF) == 0) { 618 struct vndxfer *vnx; 619 struct buf *obp; 620 struct buf *bp; 621 622 obp = bufq_get(vnd->sc_tab); 623 if (obp == NULL) { 624 tsleep(&vnd->sc_tab, PRIBIO, "vndbp", 0); 625 continue; 626 }; 627 if ((vnd->sc_flags & VNF_USE_VN_RDWR)) { 628 KASSERT(vnd->sc_pending > 0 && 629 vnd->sc_pending <= VND_MAXPENDING(vnd)); 630 if (vnd->sc_pending-- == VND_MAXPENDING(vnd)) 631 wakeup(&vnd->sc_pending); 632 } 633 splx(s); 634 #ifdef DEBUG 635 if (vnddebug & VDB_FOLLOW) 636 printf("vndthread(%p)\n", obp); 637 #endif 638 639 if (vnd->sc_vp->v_mount == NULL) { 640 obp->b_error = ENXIO; 641 goto done; 642 } 643 #ifdef VND_COMPRESSION 644 /* handle a compressed read */ 645 if ((obp->b_flags & B_READ) != 0 && (vnd->sc_flags & VNF_COMP)) { 646 off_t bn; 647 648 /* Convert to a byte offset within the file. */ 649 bn = obp->b_rawblkno * 650 vnd->sc_dkdev.dk_label->d_secsize; 651 652 compstrategy(obp, bn); 653 goto done; 654 } 655 #endif /* VND_COMPRESSION */ 656 657 /* 658 * Allocate a header for this transfer and link it to the 659 * buffer 660 */ 661 s = splbio(); 662 vnx = VND_GETXFER(vnd); 663 splx(s); 664 vnx->vx_vnd = vnd; 665 666 s = splbio(); 667 while (vnd->sc_active >= vnd->sc_maxactive) { 668 tsleep(&vnd->sc_tab, PRIBIO, "vndac", 0); 669 } 670 vnd->sc_active++; 671 splx(s); 672 673 /* Instrumentation. */ 674 disk_busy(&vnd->sc_dkdev); 675 676 bp = &vnx->vx_buf; 677 buf_init(bp); 678 bp->b_flags = (obp->b_flags & B_READ); 679 bp->b_oflags = obp->b_oflags; 680 bp->b_cflags = obp->b_cflags; 681 bp->b_iodone = vndiodone; 682 bp->b_private = obp; 683 bp->b_vp = vnd->sc_vp; 684 bp->b_objlock = bp->b_vp->v_interlock; 685 bp->b_data = obp->b_data; 686 bp->b_bcount = obp->b_bcount; 687 BIO_COPYPRIO(bp, obp); 688 689 /* Handle the request using the appropriate operations. */ 690 if ((vnd->sc_flags & VNF_USE_VN_RDWR) == 0) 691 handle_with_strategy(vnd, obp, bp); 692 else 693 handle_with_rdwr(vnd, obp, bp); 694 695 s = splbio(); 696 continue; 697 698 done: 699 biodone(obp); 700 s = splbio(); 701 } 702 703 vnd->sc_flags &= (~VNF_KTHREAD | VNF_VUNCONF); 704 wakeup(&vnd->sc_kthread); 705 splx(s); 706 kthread_exit(0); 707 } 708 709 /* 710 * Checks if the given vnode supports the requested operation. 711 * The operation is specified the offset returned by VOFFSET. 712 * 713 * XXX The test below used to determine this is quite fragile 714 * because it relies on the file system to use genfs to specify 715 * unimplemented operations. There might be another way to do 716 * it more cleanly. 717 */ 718 static bool 719 vnode_has_op(const struct vnode *vp, int opoffset) 720 { 721 int (*defaultp)(void *); 722 int (*opp)(void *); 723 724 defaultp = vp->v_op[VOFFSET(vop_default)]; 725 opp = vp->v_op[opoffset]; 726 727 return opp != defaultp && opp != genfs_eopnotsupp && 728 opp != genfs_badop && opp != genfs_nullop; 729 } 730 731 /* 732 * Handes the read/write request given in 'bp' using the vnode's VOP_READ 733 * and VOP_WRITE operations. 734 * 735 * 'obp' is a pointer to the original request fed to the vnd device. 736 */ 737 static void 738 handle_with_rdwr(struct vnd_softc *vnd, const struct buf *obp, struct buf *bp) 739 { 740 bool doread; 741 off_t offset; 742 size_t len, resid; 743 struct vnode *vp; 744 745 doread = bp->b_flags & B_READ; 746 offset = obp->b_rawblkno * vnd->sc_dkdev.dk_label->d_secsize; 747 len = bp->b_bcount; 748 vp = vnd->sc_vp; 749 750 #if defined(DEBUG) 751 if (vnddebug & VDB_IO) 752 printf("vnd (rdwr): vp %p, %s, rawblkno 0x%" PRIx64 753 ", secsize %d, offset %" PRIu64 754 ", bcount %d\n", 755 vp, doread ? "read" : "write", obp->b_rawblkno, 756 vnd->sc_dkdev.dk_label->d_secsize, offset, 757 bp->b_bcount); 758 #endif 759 760 /* Issue the read or write operation. */ 761 bp->b_error = 762 vn_rdwr(doread ? UIO_READ : UIO_WRITE, 763 vp, bp->b_data, len, offset, UIO_SYSSPACE, 764 IO_ADV_ENCODE(POSIX_FADV_NOREUSE), vnd->sc_cred, &resid, NULL); 765 bp->b_resid = resid; 766 767 mutex_enter(vp->v_interlock); 768 (void) VOP_PUTPAGES(vp, 0, 0, 769 PGO_ALLPAGES | PGO_CLEANIT | PGO_FREE | PGO_SYNCIO); 770 771 /* We need to increase the number of outputs on the vnode if 772 * there was any write to it. */ 773 if (!doread) { 774 mutex_enter(vp->v_interlock); 775 vp->v_numoutput++; 776 mutex_exit(vp->v_interlock); 777 } 778 779 biodone(bp); 780 } 781 782 /* 783 * Handes the read/write request given in 'bp' using the vnode's VOP_BMAP 784 * and VOP_STRATEGY operations. 785 * 786 * 'obp' is a pointer to the original request fed to the vnd device. 787 */ 788 static void 789 handle_with_strategy(struct vnd_softc *vnd, const struct buf *obp, 790 struct buf *bp) 791 { 792 int bsize, error, flags, skipped; 793 size_t resid, sz; 794 off_t bn, offset; 795 struct vnode *vp; 796 797 flags = obp->b_flags; 798 799 if (!(flags & B_READ)) { 800 vp = bp->b_vp; 801 mutex_enter(vp->v_interlock); 802 vp->v_numoutput++; 803 mutex_exit(vp->v_interlock); 804 } 805 806 /* convert to a byte offset within the file. */ 807 bn = obp->b_rawblkno * vnd->sc_dkdev.dk_label->d_secsize; 808 809 bsize = vnd->sc_vp->v_mount->mnt_stat.f_iosize; 810 skipped = 0; 811 812 /* 813 * Break the request into bsize pieces and feed them 814 * sequentially using VOP_BMAP/VOP_STRATEGY. 815 * We do it this way to keep from flooding NFS servers if we 816 * are connected to an NFS file. This places the burden on 817 * the client rather than the server. 818 */ 819 error = 0; 820 bp->b_resid = bp->b_bcount; 821 for (offset = 0, resid = bp->b_resid; resid; 822 resid -= sz, offset += sz) { 823 struct buf *nbp; 824 daddr_t nbn; 825 int off, nra; 826 827 nra = 0; 828 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 829 error = VOP_BMAP(vnd->sc_vp, bn / bsize, &vp, &nbn, &nra); 830 VOP_UNLOCK(vnd->sc_vp); 831 832 if (error == 0 && (long)nbn == -1) 833 error = EIO; 834 835 /* 836 * If there was an error or a hole in the file...punt. 837 * Note that we may have to wait for any operations 838 * that we have already fired off before releasing 839 * the buffer. 840 * 841 * XXX we could deal with holes here but it would be 842 * a hassle (in the write case). 843 */ 844 if (error) { 845 skipped += resid; 846 break; 847 } 848 849 #ifdef DEBUG 850 if (!dovndcluster) 851 nra = 0; 852 #endif 853 854 off = bn % bsize; 855 sz = MIN(((off_t)1 + nra) * bsize - off, resid); 856 #ifdef DEBUG 857 if (vnddebug & VDB_IO) 858 printf("vndstrategy: vp %p/%p bn 0x%qx/0x%" PRIx64 859 " sz 0x%zx\n", vnd->sc_vp, vp, (long long)bn, 860 nbn, sz); 861 #endif 862 863 nbp = getiobuf(vp, true); 864 nestiobuf_setup(bp, nbp, offset, sz); 865 nbp->b_blkno = nbn + btodb(off); 866 867 #if 0 /* XXX #ifdef DEBUG */ 868 if (vnddebug & VDB_IO) 869 printf("vndstart(%ld): bp %p vp %p blkno " 870 "0x%" PRIx64 " flags %x addr %p cnt 0x%x\n", 871 (long) (vnd-vnd_softc), &nbp->vb_buf, 872 nbp->vb_buf.b_vp, nbp->vb_buf.b_blkno, 873 nbp->vb_buf.b_flags, nbp->vb_buf.b_data, 874 nbp->vb_buf.b_bcount); 875 #endif 876 VOP_STRATEGY(vp, nbp); 877 bn += sz; 878 } 879 nestiobuf_done(bp, skipped, error); 880 } 881 882 static void 883 vndiodone(struct buf *bp) 884 { 885 struct vndxfer *vnx = VND_BUFTOXFER(bp); 886 struct vnd_softc *vnd = vnx->vx_vnd; 887 struct buf *obp = bp->b_private; 888 int s = splbio(); 889 890 KASSERT(&vnx->vx_buf == bp); 891 KASSERT(vnd->sc_active > 0); 892 #ifdef DEBUG 893 if (vnddebug & VDB_IO) { 894 printf("vndiodone1: bp %p iodone: error %d\n", 895 bp, bp->b_error); 896 } 897 #endif 898 disk_unbusy(&vnd->sc_dkdev, bp->b_bcount - bp->b_resid, 899 (bp->b_flags & B_READ)); 900 vnd->sc_active--; 901 if (vnd->sc_active == 0) { 902 wakeup(&vnd->sc_tab); 903 } 904 splx(s); 905 obp->b_error = bp->b_error; 906 obp->b_resid = bp->b_resid; 907 buf_destroy(bp); 908 VND_PUTXFER(vnd, vnx); 909 biodone(obp); 910 } 911 912 /* ARGSUSED */ 913 static int 914 vndread(dev_t dev, struct uio *uio, int flags) 915 { 916 int unit = vndunit(dev); 917 struct vnd_softc *sc; 918 919 #ifdef DEBUG 920 if (vnddebug & VDB_FOLLOW) 921 printf("vndread(0x%"PRIx64", %p)\n", dev, uio); 922 #endif 923 924 sc = device_lookup_private(&vnd_cd, unit); 925 if (sc == NULL) 926 return ENXIO; 927 928 if ((sc->sc_flags & VNF_INITED) == 0) 929 return ENXIO; 930 931 return physio(vndstrategy, NULL, dev, B_READ, minphys, uio); 932 } 933 934 /* ARGSUSED */ 935 static int 936 vndwrite(dev_t dev, struct uio *uio, int flags) 937 { 938 int unit = vndunit(dev); 939 struct vnd_softc *sc; 940 941 #ifdef DEBUG 942 if (vnddebug & VDB_FOLLOW) 943 printf("vndwrite(0x%"PRIx64", %p)\n", dev, uio); 944 #endif 945 946 sc = device_lookup_private(&vnd_cd, unit); 947 if (sc == NULL) 948 return ENXIO; 949 950 if ((sc->sc_flags & VNF_INITED) == 0) 951 return ENXIO; 952 953 return physio(vndstrategy, NULL, dev, B_WRITE, minphys, uio); 954 } 955 956 static int 957 vnd_cget(struct lwp *l, int unit, int *un, struct vattr *va) 958 { 959 int error; 960 struct vnd_softc *vnd; 961 962 if (*un == -1) 963 *un = unit; 964 if (*un < 0) 965 return EINVAL; 966 967 vnd = device_lookup_private(&vnd_cd, *un); 968 if (vnd == NULL) 969 return -1; 970 971 if ((vnd->sc_flags & VNF_INITED) == 0) 972 return -1; 973 974 vn_lock(vnd->sc_vp, LK_SHARED | LK_RETRY); 975 error = VOP_GETATTR(vnd->sc_vp, va, l->l_cred); 976 VOP_UNLOCK(vnd->sc_vp); 977 return error; 978 } 979 980 static int 981 vnddoclear(struct vnd_softc *vnd, int pmask, int minor, bool force) 982 { 983 int error; 984 985 if ((error = vndlock(vnd)) != 0) 986 return error; 987 988 /* 989 * Don't unconfigure if any other partitions are open 990 * or if both the character and block flavors of this 991 * partition are open. 992 */ 993 if (DK_BUSY(vnd, pmask) && !force) { 994 vndunlock(vnd); 995 return EBUSY; 996 } 997 998 /* Delete all of our wedges */ 999 dkwedge_delall(&vnd->sc_dkdev); 1000 1001 /* 1002 * XXX vndclear() might call vndclose() implicitly; 1003 * release lock to avoid recursion 1004 * 1005 * Set VNF_CLEARING to prevent vndopen() from 1006 * sneaking in after we vndunlock(). 1007 */ 1008 vnd->sc_flags |= VNF_CLEARING; 1009 vndunlock(vnd); 1010 vndclear(vnd, minor); 1011 #ifdef DEBUG 1012 if (vnddebug & VDB_INIT) 1013 printf("vndioctl: CLRed\n"); 1014 #endif 1015 1016 /* Destroy the xfer and buffer pools. */ 1017 pool_destroy(&vnd->sc_vxpool); 1018 1019 /* Detach the disk. */ 1020 disk_detach(&vnd->sc_dkdev); 1021 1022 return 0; 1023 } 1024 1025 /* ARGSUSED */ 1026 static int 1027 vndioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 1028 { 1029 bool force; 1030 int unit = vndunit(dev); 1031 struct vnd_softc *vnd; 1032 struct vnd_ioctl *vio; 1033 struct vattr vattr; 1034 struct pathbuf *pb; 1035 struct nameidata nd; 1036 int error, part, pmask; 1037 uint64_t geomsize; 1038 int fflags; 1039 #ifdef __HAVE_OLD_DISKLABEL 1040 struct disklabel newlabel; 1041 #endif 1042 struct dkwedge_info *dkw; 1043 struct dkwedge_list *dkwl; 1044 1045 #ifdef DEBUG 1046 if (vnddebug & VDB_FOLLOW) 1047 printf("vndioctl(0x%"PRIx64", 0x%lx, %p, 0x%x, %p): unit %d\n", 1048 dev, cmd, data, flag, l->l_proc, unit); 1049 #endif 1050 vnd = device_lookup_private(&vnd_cd, unit); 1051 if (vnd == NULL && 1052 #ifdef COMPAT_30 1053 cmd != VNDIOCGET30 && 1054 #endif 1055 #ifdef COMPAT_50 1056 cmd != VNDIOCGET50 && 1057 #endif 1058 cmd != VNDIOCGET) 1059 return ENXIO; 1060 vio = (struct vnd_ioctl *)data; 1061 1062 /* Must be open for writes for these commands... */ 1063 switch (cmd) { 1064 case VNDIOCSET: 1065 case VNDIOCCLR: 1066 #ifdef COMPAT_50 1067 case VNDIOCSET50: 1068 case VNDIOCCLR50: 1069 #endif 1070 case DIOCSDINFO: 1071 case DIOCWDINFO: 1072 #ifdef __HAVE_OLD_DISKLABEL 1073 case ODIOCSDINFO: 1074 case ODIOCWDINFO: 1075 #endif 1076 case DIOCKLABEL: 1077 case DIOCWLABEL: 1078 if ((flag & FWRITE) == 0) 1079 return EBADF; 1080 } 1081 1082 /* Must be initialized for these... */ 1083 switch (cmd) { 1084 case VNDIOCCLR: 1085 #ifdef VNDIOCCLR50 1086 case VNDIOCCLR50: 1087 #endif 1088 case DIOCGDINFO: 1089 case DIOCSDINFO: 1090 case DIOCWDINFO: 1091 case DIOCGPART: 1092 case DIOCKLABEL: 1093 case DIOCWLABEL: 1094 case DIOCGDEFLABEL: 1095 case DIOCCACHESYNC: 1096 #ifdef __HAVE_OLD_DISKLABEL 1097 case ODIOCGDINFO: 1098 case ODIOCSDINFO: 1099 case ODIOCWDINFO: 1100 case ODIOCGDEFLABEL: 1101 #endif 1102 if ((vnd->sc_flags & VNF_INITED) == 0) 1103 return ENXIO; 1104 } 1105 1106 switch (cmd) { 1107 #ifdef VNDIOCSET50 1108 case VNDIOCSET50: 1109 #endif 1110 case VNDIOCSET: 1111 if (vnd->sc_flags & VNF_INITED) 1112 return EBUSY; 1113 1114 if ((error = vndlock(vnd)) != 0) 1115 return error; 1116 1117 fflags = FREAD; 1118 if ((vio->vnd_flags & VNDIOF_READONLY) == 0) 1119 fflags |= FWRITE; 1120 error = pathbuf_copyin(vio->vnd_file, &pb); 1121 if (error) { 1122 goto unlock_and_exit; 1123 } 1124 NDINIT(&nd, LOOKUP, FOLLOW, pb); 1125 if ((error = vn_open(&nd, fflags, 0)) != 0) { 1126 pathbuf_destroy(pb); 1127 goto unlock_and_exit; 1128 } 1129 KASSERT(l); 1130 error = VOP_GETATTR(nd.ni_vp, &vattr, l->l_cred); 1131 if (!error && nd.ni_vp->v_type != VREG) 1132 error = EOPNOTSUPP; 1133 if (!error && vattr.va_bytes < vattr.va_size) 1134 /* File is definitely sparse, use vn_rdwr() */ 1135 vnd->sc_flags |= VNF_USE_VN_RDWR; 1136 if (error) { 1137 VOP_UNLOCK(nd.ni_vp); 1138 goto close_and_exit; 1139 } 1140 1141 /* If using a compressed file, initialize its info */ 1142 /* (or abort with an error if kernel has no compression) */ 1143 if (vio->vnd_flags & VNF_COMP) { 1144 #ifdef VND_COMPRESSION 1145 struct vnd_comp_header *ch; 1146 int i; 1147 u_int32_t comp_size; 1148 u_int32_t comp_maxsize; 1149 1150 /* allocate space for compresed file header */ 1151 ch = malloc(sizeof(struct vnd_comp_header), 1152 M_TEMP, M_WAITOK); 1153 1154 /* read compressed file header */ 1155 error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)ch, 1156 sizeof(struct vnd_comp_header), 0, UIO_SYSSPACE, 1157 IO_UNIT|IO_NODELOCKED, l->l_cred, NULL, NULL); 1158 if (error) { 1159 free(ch, M_TEMP); 1160 VOP_UNLOCK(nd.ni_vp); 1161 goto close_and_exit; 1162 } 1163 1164 /* save some header info */ 1165 vnd->sc_comp_blksz = ntohl(ch->block_size); 1166 /* note last offset is the file byte size */ 1167 vnd->sc_comp_numoffs = ntohl(ch->num_blocks)+1; 1168 free(ch, M_TEMP); 1169 if (vnd->sc_comp_blksz == 0 || 1170 vnd->sc_comp_blksz % DEV_BSIZE !=0) { 1171 VOP_UNLOCK(nd.ni_vp); 1172 error = EINVAL; 1173 goto close_and_exit; 1174 } 1175 if (sizeof(struct vnd_comp_header) + 1176 sizeof(u_int64_t) * vnd->sc_comp_numoffs > 1177 vattr.va_size) { 1178 VOP_UNLOCK(nd.ni_vp); 1179 error = EINVAL; 1180 goto close_and_exit; 1181 } 1182 1183 /* set decompressed file size */ 1184 vattr.va_size = 1185 ((u_quad_t)vnd->sc_comp_numoffs - 1) * 1186 (u_quad_t)vnd->sc_comp_blksz; 1187 1188 /* allocate space for all the compressed offsets */ 1189 vnd->sc_comp_offsets = 1190 malloc(sizeof(u_int64_t) * vnd->sc_comp_numoffs, 1191 M_DEVBUF, M_WAITOK); 1192 1193 /* read in the offsets */ 1194 error = vn_rdwr(UIO_READ, nd.ni_vp, 1195 (void *)vnd->sc_comp_offsets, 1196 sizeof(u_int64_t) * vnd->sc_comp_numoffs, 1197 sizeof(struct vnd_comp_header), UIO_SYSSPACE, 1198 IO_UNIT|IO_NODELOCKED, l->l_cred, NULL, NULL); 1199 if (error) { 1200 VOP_UNLOCK(nd.ni_vp); 1201 goto close_and_exit; 1202 } 1203 /* 1204 * find largest block size (used for allocation limit). 1205 * Also convert offset to native byte order. 1206 */ 1207 comp_maxsize = 0; 1208 for (i = 0; i < vnd->sc_comp_numoffs - 1; i++) { 1209 vnd->sc_comp_offsets[i] = 1210 be64toh(vnd->sc_comp_offsets[i]); 1211 comp_size = be64toh(vnd->sc_comp_offsets[i + 1]) 1212 - vnd->sc_comp_offsets[i]; 1213 if (comp_size > comp_maxsize) 1214 comp_maxsize = comp_size; 1215 } 1216 vnd->sc_comp_offsets[vnd->sc_comp_numoffs - 1] = 1217 be64toh(vnd->sc_comp_offsets[vnd->sc_comp_numoffs - 1]); 1218 1219 /* create compressed data buffer */ 1220 vnd->sc_comp_buff = malloc(comp_maxsize, 1221 M_DEVBUF, M_WAITOK); 1222 1223 /* create decompressed buffer */ 1224 vnd->sc_comp_decombuf = malloc(vnd->sc_comp_blksz, 1225 M_DEVBUF, M_WAITOK); 1226 vnd->sc_comp_buffblk = -1; 1227 1228 /* Initialize decompress stream */ 1229 memset(&vnd->sc_comp_stream, 0, sizeof(z_stream)); 1230 vnd->sc_comp_stream.zalloc = vnd_alloc; 1231 vnd->sc_comp_stream.zfree = vnd_free; 1232 error = inflateInit2(&vnd->sc_comp_stream, MAX_WBITS); 1233 if (error) { 1234 if (vnd->sc_comp_stream.msg) 1235 printf("vnd%d: compressed file, %s\n", 1236 unit, vnd->sc_comp_stream.msg); 1237 VOP_UNLOCK(nd.ni_vp); 1238 error = EINVAL; 1239 goto close_and_exit; 1240 } 1241 1242 vnd->sc_flags |= VNF_COMP | VNF_READONLY; 1243 #else /* !VND_COMPRESSION */ 1244 VOP_UNLOCK(nd.ni_vp); 1245 error = EOPNOTSUPP; 1246 goto close_and_exit; 1247 #endif /* VND_COMPRESSION */ 1248 } 1249 1250 VOP_UNLOCK(nd.ni_vp); 1251 vnd->sc_vp = nd.ni_vp; 1252 vnd->sc_size = btodb(vattr.va_size); /* note truncation */ 1253 1254 /* 1255 * Use pseudo-geometry specified. If none was provided, 1256 * use "standard" Adaptec fictitious geometry. 1257 */ 1258 if (vio->vnd_flags & VNDIOF_HASGEOM) { 1259 1260 memcpy(&vnd->sc_geom, &vio->vnd_geom, 1261 sizeof(vio->vnd_geom)); 1262 1263 /* 1264 * Sanity-check the sector size. 1265 * XXX Don't allow secsize < DEV_BSIZE. Should 1266 * XXX we? 1267 */ 1268 if (vnd->sc_geom.vng_secsize < DEV_BSIZE || 1269 (vnd->sc_geom.vng_secsize % DEV_BSIZE) != 0 || 1270 vnd->sc_geom.vng_ncylinders == 0 || 1271 (vnd->sc_geom.vng_ntracks * 1272 vnd->sc_geom.vng_nsectors) == 0) { 1273 error = EINVAL; 1274 goto close_and_exit; 1275 } 1276 1277 /* 1278 * Compute the size (in DEV_BSIZE blocks) specified 1279 * by the geometry. 1280 */ 1281 geomsize = (vnd->sc_geom.vng_nsectors * 1282 vnd->sc_geom.vng_ntracks * 1283 vnd->sc_geom.vng_ncylinders) * 1284 (vnd->sc_geom.vng_secsize / DEV_BSIZE); 1285 1286 /* 1287 * Sanity-check the size against the specified 1288 * geometry. 1289 */ 1290 if (vnd->sc_size < geomsize) { 1291 error = EINVAL; 1292 goto close_and_exit; 1293 } 1294 } else if (vnd->sc_size >= (32 * 64)) { 1295 /* 1296 * Size must be at least 2048 DEV_BSIZE blocks 1297 * (1M) in order to use this geometry. 1298 */ 1299 vnd->sc_geom.vng_secsize = DEV_BSIZE; 1300 vnd->sc_geom.vng_nsectors = 32; 1301 vnd->sc_geom.vng_ntracks = 64; 1302 vnd->sc_geom.vng_ncylinders = vnd->sc_size / (64 * 32); 1303 } else { 1304 vnd->sc_geom.vng_secsize = DEV_BSIZE; 1305 vnd->sc_geom.vng_nsectors = 1; 1306 vnd->sc_geom.vng_ntracks = 1; 1307 vnd->sc_geom.vng_ncylinders = vnd->sc_size; 1308 } 1309 1310 vnd_set_geometry(vnd); 1311 1312 if (vio->vnd_flags & VNDIOF_READONLY) { 1313 vnd->sc_flags |= VNF_READONLY; 1314 } 1315 1316 if ((error = vndsetcred(vnd, l->l_cred)) != 0) 1317 goto close_and_exit; 1318 1319 vndthrottle(vnd, vnd->sc_vp); 1320 vio->vnd_osize = dbtob(vnd->sc_size); 1321 #ifdef VNDIOCSET50 1322 if (cmd != VNDIOCSET50) 1323 #endif 1324 vio->vnd_size = dbtob(vnd->sc_size); 1325 vnd->sc_flags |= VNF_INITED; 1326 1327 /* create the kernel thread, wait for it to be up */ 1328 error = kthread_create(PRI_NONE, 0, NULL, vndthread, vnd, 1329 &vnd->sc_kthread, "%s", device_xname(vnd->sc_dev)); 1330 if (error) 1331 goto close_and_exit; 1332 while ((vnd->sc_flags & VNF_KTHREAD) == 0) { 1333 tsleep(&vnd->sc_kthread, PRIBIO, "vndthr", 0); 1334 } 1335 #ifdef DEBUG 1336 if (vnddebug & VDB_INIT) 1337 printf("vndioctl: SET vp %p size 0x%lx %d/%d/%d/%d\n", 1338 vnd->sc_vp, (unsigned long) vnd->sc_size, 1339 vnd->sc_geom.vng_secsize, 1340 vnd->sc_geom.vng_nsectors, 1341 vnd->sc_geom.vng_ntracks, 1342 vnd->sc_geom.vng_ncylinders); 1343 #endif 1344 1345 /* Attach the disk. */ 1346 disk_attach(&vnd->sc_dkdev); 1347 disk_blocksize(&vnd->sc_dkdev, vnd->sc_geom.vng_secsize); 1348 1349 /* Initialize the xfer and buffer pools. */ 1350 pool_init(&vnd->sc_vxpool, sizeof(struct vndxfer), 0, 1351 0, 0, "vndxpl", NULL, IPL_BIO); 1352 1353 vndunlock(vnd); 1354 1355 pathbuf_destroy(pb); 1356 1357 /* Discover wedges on this disk */ 1358 dkwedge_discover(&vnd->sc_dkdev); 1359 1360 break; 1361 1362 close_and_exit: 1363 (void) vn_close(nd.ni_vp, fflags, l->l_cred); 1364 pathbuf_destroy(pb); 1365 unlock_and_exit: 1366 #ifdef VND_COMPRESSION 1367 /* free any allocated memory (for compressed file) */ 1368 if (vnd->sc_comp_offsets) { 1369 free(vnd->sc_comp_offsets, M_DEVBUF); 1370 vnd->sc_comp_offsets = NULL; 1371 } 1372 if (vnd->sc_comp_buff) { 1373 free(vnd->sc_comp_buff, M_DEVBUF); 1374 vnd->sc_comp_buff = NULL; 1375 } 1376 if (vnd->sc_comp_decombuf) { 1377 free(vnd->sc_comp_decombuf, M_DEVBUF); 1378 vnd->sc_comp_decombuf = NULL; 1379 } 1380 #endif /* VND_COMPRESSION */ 1381 vndunlock(vnd); 1382 return error; 1383 1384 #ifdef VNDIOCCLR50 1385 case VNDIOCCLR50: 1386 #endif 1387 case VNDIOCCLR: 1388 part = DISKPART(dev); 1389 pmask = (1 << part); 1390 force = (vio->vnd_flags & VNDIOF_FORCE) != 0; 1391 1392 if ((error = vnddoclear(vnd, pmask, minor(dev), force)) != 0) 1393 return error; 1394 1395 break; 1396 1397 #ifdef COMPAT_30 1398 case VNDIOCGET30: { 1399 struct vnd_user30 *vnu; 1400 struct vattr va; 1401 vnu = (struct vnd_user30 *)data; 1402 KASSERT(l); 1403 switch (error = vnd_cget(l, unit, &vnu->vnu_unit, &va)) { 1404 case 0: 1405 vnu->vnu_dev = va.va_fsid; 1406 vnu->vnu_ino = va.va_fileid; 1407 break; 1408 case -1: 1409 /* unused is not an error */ 1410 vnu->vnu_dev = 0; 1411 vnu->vnu_ino = 0; 1412 break; 1413 default: 1414 return error; 1415 } 1416 break; 1417 } 1418 #endif 1419 1420 #ifdef COMPAT_50 1421 case VNDIOCGET50: { 1422 struct vnd_user50 *vnu; 1423 struct vattr va; 1424 vnu = (struct vnd_user50 *)data; 1425 KASSERT(l); 1426 switch (error = vnd_cget(l, unit, &vnu->vnu_unit, &va)) { 1427 case 0: 1428 vnu->vnu_dev = va.va_fsid; 1429 vnu->vnu_ino = va.va_fileid; 1430 break; 1431 case -1: 1432 /* unused is not an error */ 1433 vnu->vnu_dev = 0; 1434 vnu->vnu_ino = 0; 1435 break; 1436 default: 1437 return error; 1438 } 1439 break; 1440 } 1441 #endif 1442 1443 case VNDIOCGET: { 1444 struct vnd_user *vnu; 1445 struct vattr va; 1446 vnu = (struct vnd_user *)data; 1447 KASSERT(l); 1448 switch (error = vnd_cget(l, unit, &vnu->vnu_unit, &va)) { 1449 case 0: 1450 vnu->vnu_dev = va.va_fsid; 1451 vnu->vnu_ino = va.va_fileid; 1452 break; 1453 case -1: 1454 /* unused is not an error */ 1455 vnu->vnu_dev = 0; 1456 vnu->vnu_ino = 0; 1457 break; 1458 default: 1459 return error; 1460 } 1461 break; 1462 } 1463 1464 case DIOCGDINFO: 1465 *(struct disklabel *)data = *(vnd->sc_dkdev.dk_label); 1466 break; 1467 1468 #ifdef __HAVE_OLD_DISKLABEL 1469 case ODIOCGDINFO: 1470 newlabel = *(vnd->sc_dkdev.dk_label); 1471 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 1472 return ENOTTY; 1473 memcpy(data, &newlabel, sizeof (struct olddisklabel)); 1474 break; 1475 #endif 1476 1477 case DIOCGPART: 1478 ((struct partinfo *)data)->disklab = vnd->sc_dkdev.dk_label; 1479 ((struct partinfo *)data)->part = 1480 &vnd->sc_dkdev.dk_label->d_partitions[DISKPART(dev)]; 1481 break; 1482 1483 case DIOCWDINFO: 1484 case DIOCSDINFO: 1485 #ifdef __HAVE_OLD_DISKLABEL 1486 case ODIOCWDINFO: 1487 case ODIOCSDINFO: 1488 #endif 1489 { 1490 struct disklabel *lp; 1491 1492 if ((error = vndlock(vnd)) != 0) 1493 return error; 1494 1495 vnd->sc_flags |= VNF_LABELLING; 1496 1497 #ifdef __HAVE_OLD_DISKLABEL 1498 if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) { 1499 memset(&newlabel, 0, sizeof newlabel); 1500 memcpy(&newlabel, data, sizeof (struct olddisklabel)); 1501 lp = &newlabel; 1502 } else 1503 #endif 1504 lp = (struct disklabel *)data; 1505 1506 error = setdisklabel(vnd->sc_dkdev.dk_label, 1507 lp, 0, vnd->sc_dkdev.dk_cpulabel); 1508 if (error == 0) { 1509 if (cmd == DIOCWDINFO 1510 #ifdef __HAVE_OLD_DISKLABEL 1511 || cmd == ODIOCWDINFO 1512 #endif 1513 ) 1514 error = writedisklabel(VNDLABELDEV(dev), 1515 vndstrategy, vnd->sc_dkdev.dk_label, 1516 vnd->sc_dkdev.dk_cpulabel); 1517 } 1518 1519 vnd->sc_flags &= ~VNF_LABELLING; 1520 1521 vndunlock(vnd); 1522 1523 if (error) 1524 return error; 1525 break; 1526 } 1527 1528 case DIOCKLABEL: 1529 if (*(int *)data != 0) 1530 vnd->sc_flags |= VNF_KLABEL; 1531 else 1532 vnd->sc_flags &= ~VNF_KLABEL; 1533 break; 1534 1535 case DIOCWLABEL: 1536 if (*(int *)data != 0) 1537 vnd->sc_flags |= VNF_WLABEL; 1538 else 1539 vnd->sc_flags &= ~VNF_WLABEL; 1540 break; 1541 1542 case DIOCGDEFLABEL: 1543 vndgetdefaultlabel(vnd, (struct disklabel *)data); 1544 break; 1545 1546 #ifdef __HAVE_OLD_DISKLABEL 1547 case ODIOCGDEFLABEL: 1548 vndgetdefaultlabel(vnd, &newlabel); 1549 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 1550 return ENOTTY; 1551 memcpy(data, &newlabel, sizeof (struct olddisklabel)); 1552 break; 1553 #endif 1554 1555 case DIOCCACHESYNC: 1556 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 1557 error = VOP_FSYNC(vnd->sc_vp, vnd->sc_cred, 1558 FSYNC_WAIT | FSYNC_DATAONLY | FSYNC_CACHE, 0, 0); 1559 VOP_UNLOCK(vnd->sc_vp); 1560 return error; 1561 1562 case DIOCAWEDGE: 1563 dkw = (void *) data; 1564 1565 if ((flag & FWRITE) == 0) 1566 return EBADF; 1567 1568 /* If the ioctl happens here, the parent is us. */ 1569 strlcpy(dkw->dkw_parent, device_xname(vnd->sc_dev), 1570 sizeof(dkw->dkw_parent)); 1571 return dkwedge_add(dkw); 1572 1573 case DIOCDWEDGE: 1574 dkw = (void *) data; 1575 1576 if ((flag & FWRITE) == 0) 1577 return EBADF; 1578 1579 /* If the ioctl happens here, the parent is us. */ 1580 strlcpy(dkw->dkw_parent, device_xname(vnd->sc_dev), 1581 sizeof(dkw->dkw_parent)); 1582 return dkwedge_del(dkw); 1583 1584 case DIOCLWEDGES: 1585 dkwl = (void *) data; 1586 1587 return dkwedge_list(&vnd->sc_dkdev, dkwl, l); 1588 1589 default: 1590 return ENOTTY; 1591 } 1592 1593 return 0; 1594 } 1595 1596 /* 1597 * Duplicate the current processes' credentials. Since we are called only 1598 * as the result of a SET ioctl and only root can do that, any future access 1599 * to this "disk" is essentially as root. Note that credentials may change 1600 * if some other uid can write directly to the mapped file (NFS). 1601 */ 1602 static int 1603 vndsetcred(struct vnd_softc *vnd, kauth_cred_t cred) 1604 { 1605 struct uio auio; 1606 struct iovec aiov; 1607 char *tmpbuf; 1608 int error; 1609 1610 vnd->sc_cred = kauth_cred_dup(cred); 1611 tmpbuf = malloc(DEV_BSIZE, M_TEMP, M_WAITOK); 1612 1613 /* XXX: Horrible kludge to establish credentials for NFS */ 1614 aiov.iov_base = tmpbuf; 1615 aiov.iov_len = min(DEV_BSIZE, dbtob(vnd->sc_size)); 1616 auio.uio_iov = &aiov; 1617 auio.uio_iovcnt = 1; 1618 auio.uio_offset = 0; 1619 auio.uio_rw = UIO_READ; 1620 auio.uio_resid = aiov.iov_len; 1621 UIO_SETUP_SYSSPACE(&auio); 1622 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 1623 error = VOP_READ(vnd->sc_vp, &auio, 0, vnd->sc_cred); 1624 if (error == 0) { 1625 /* 1626 * Because vnd does all IO directly through the vnode 1627 * we need to flush (at least) the buffer from the above 1628 * VOP_READ from the buffer cache to prevent cache 1629 * incoherencies. Also, be careful to write dirty 1630 * buffers back to stable storage. 1631 */ 1632 error = vinvalbuf(vnd->sc_vp, V_SAVE, vnd->sc_cred, 1633 curlwp, 0, 0); 1634 } 1635 VOP_UNLOCK(vnd->sc_vp); 1636 1637 free(tmpbuf, M_TEMP); 1638 return error; 1639 } 1640 1641 /* 1642 * Set maxactive based on FS type 1643 */ 1644 static void 1645 vndthrottle(struct vnd_softc *vnd, struct vnode *vp) 1646 { 1647 1648 if (vp->v_tag == VT_NFS) 1649 vnd->sc_maxactive = 2; 1650 else 1651 vnd->sc_maxactive = 8; 1652 1653 if (vnd->sc_maxactive < 1) 1654 vnd->sc_maxactive = 1; 1655 } 1656 1657 #if 0 1658 static void 1659 vndshutdown(void) 1660 { 1661 struct vnd_softc *vnd; 1662 1663 for (vnd = &vnd_softc[0]; vnd < &vnd_softc[numvnd]; vnd++) 1664 if (vnd->sc_flags & VNF_INITED) 1665 vndclear(vnd); 1666 } 1667 #endif 1668 1669 static void 1670 vndclear(struct vnd_softc *vnd, int myminor) 1671 { 1672 struct vnode *vp = vnd->sc_vp; 1673 int fflags = FREAD; 1674 int bmaj, cmaj, i, mn; 1675 int s; 1676 1677 #ifdef DEBUG 1678 if (vnddebug & VDB_FOLLOW) 1679 printf("vndclear(%p): vp %p\n", vnd, vp); 1680 #endif 1681 /* locate the major number */ 1682 bmaj = bdevsw_lookup_major(&vnd_bdevsw); 1683 cmaj = cdevsw_lookup_major(&vnd_cdevsw); 1684 1685 /* Nuke the vnodes for any open instances */ 1686 for (i = 0; i < MAXPARTITIONS; i++) { 1687 mn = DISKMINOR(device_unit(vnd->sc_dev), i); 1688 vdevgone(bmaj, mn, mn, VBLK); 1689 if (mn != myminor) /* XXX avoid to kill own vnode */ 1690 vdevgone(cmaj, mn, mn, VCHR); 1691 } 1692 1693 if ((vnd->sc_flags & VNF_READONLY) == 0) 1694 fflags |= FWRITE; 1695 1696 s = splbio(); 1697 bufq_drain(vnd->sc_tab); 1698 splx(s); 1699 1700 vnd->sc_flags |= VNF_VUNCONF; 1701 wakeup(&vnd->sc_tab); 1702 while (vnd->sc_flags & VNF_KTHREAD) 1703 tsleep(&vnd->sc_kthread, PRIBIO, "vnthr", 0); 1704 1705 #ifdef VND_COMPRESSION 1706 /* free the compressed file buffers */ 1707 if (vnd->sc_flags & VNF_COMP) { 1708 if (vnd->sc_comp_offsets) { 1709 free(vnd->sc_comp_offsets, M_DEVBUF); 1710 vnd->sc_comp_offsets = NULL; 1711 } 1712 if (vnd->sc_comp_buff) { 1713 free(vnd->sc_comp_buff, M_DEVBUF); 1714 vnd->sc_comp_buff = NULL; 1715 } 1716 if (vnd->sc_comp_decombuf) { 1717 free(vnd->sc_comp_decombuf, M_DEVBUF); 1718 vnd->sc_comp_decombuf = NULL; 1719 } 1720 } 1721 #endif /* VND_COMPRESSION */ 1722 vnd->sc_flags &= 1723 ~(VNF_INITED | VNF_READONLY | VNF_VLABEL 1724 | VNF_VUNCONF | VNF_COMP | VNF_CLEARING); 1725 if (vp == NULL) 1726 panic("vndclear: null vp"); 1727 (void) vn_close(vp, fflags, vnd->sc_cred); 1728 kauth_cred_free(vnd->sc_cred); 1729 vnd->sc_vp = NULL; 1730 vnd->sc_cred = NULL; 1731 vnd->sc_size = 0; 1732 } 1733 1734 static int 1735 vndsize(dev_t dev) 1736 { 1737 struct vnd_softc *sc; 1738 struct disklabel *lp; 1739 int part, unit, omask; 1740 int size; 1741 1742 unit = vndunit(dev); 1743 sc = device_lookup_private(&vnd_cd, unit); 1744 if (sc == NULL) 1745 return -1; 1746 1747 if ((sc->sc_flags & VNF_INITED) == 0) 1748 return -1; 1749 1750 part = DISKPART(dev); 1751 omask = sc->sc_dkdev.dk_openmask & (1 << part); 1752 lp = sc->sc_dkdev.dk_label; 1753 1754 if (omask == 0 && vndopen(dev, 0, S_IFBLK, curlwp)) /* XXX */ 1755 return -1; 1756 1757 if (lp->d_partitions[part].p_fstype != FS_SWAP) 1758 size = -1; 1759 else 1760 size = lp->d_partitions[part].p_size * 1761 (lp->d_secsize / DEV_BSIZE); 1762 1763 if (omask == 0 && vndclose(dev, 0, S_IFBLK, curlwp)) /* XXX */ 1764 return -1; 1765 1766 return size; 1767 } 1768 1769 static int 1770 vnddump(dev_t dev, daddr_t blkno, void *va, 1771 size_t size) 1772 { 1773 1774 /* Not implemented. */ 1775 return ENXIO; 1776 } 1777 1778 static void 1779 vndgetdefaultlabel(struct vnd_softc *sc, struct disklabel *lp) 1780 { 1781 struct vndgeom *vng = &sc->sc_geom; 1782 struct partition *pp; 1783 1784 memset(lp, 0, sizeof(*lp)); 1785 1786 lp->d_secperunit = sc->sc_size / (vng->vng_secsize / DEV_BSIZE); 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 = DTYPE_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 disk_set_info(vnd->sc_dev, &vnd->sc_dkdev, NULL); 2026 } 2027 2028 #ifdef _MODULE 2029 2030 #include <sys/module.h> 2031 2032 MODULE(MODULE_CLASS_DRIVER, vnd, "zlib"); 2033 CFDRIVER_DECL(vnd, DV_DISK, NULL); 2034 2035 static int 2036 vnd_modcmd(modcmd_t cmd, void *arg) 2037 { 2038 int bmajor = -1, cmajor = -1, error = 0; 2039 2040 switch (cmd) { 2041 case MODULE_CMD_INIT: 2042 error = config_cfdriver_attach(&vnd_cd); 2043 if (error) 2044 break; 2045 2046 error = config_cfattach_attach(vnd_cd.cd_name, &vnd_ca); 2047 if (error) { 2048 config_cfdriver_detach(&vnd_cd); 2049 aprint_error("%s: unable to register cfattach\n", 2050 vnd_cd.cd_name); 2051 break; 2052 } 2053 2054 error = devsw_attach("vnd", &vnd_bdevsw, &bmajor, 2055 &vnd_cdevsw, &cmajor); 2056 if (error) { 2057 config_cfattach_detach(vnd_cd.cd_name, &vnd_ca); 2058 config_cfdriver_detach(&vnd_cd); 2059 break; 2060 } 2061 2062 break; 2063 2064 case MODULE_CMD_FINI: 2065 error = config_cfattach_detach(vnd_cd.cd_name, &vnd_ca); 2066 if (error) 2067 break; 2068 config_cfdriver_detach(&vnd_cd); 2069 devsw_detach(&vnd_bdevsw, &vnd_cdevsw); 2070 break; 2071 2072 case MODULE_CMD_STAT: 2073 return ENOTTY; 2074 2075 default: 2076 return ENOTTY; 2077 } 2078 2079 return error; 2080 } 2081 2082 #endif 2083
Indexes created Mon Sep 29 21:09:56 GMT 2025