vnd.c revision 1.257
1 /* $NetBSD: vnd.c,v 1.257 2016/07/26 01:49:48 pgoyette 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 1.257 2016/07/26 01:49:48 pgoyette 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 #include <sys/module.h> 122 123 #include <net/zlib.h> 124 125 #include <miscfs/genfs/genfs.h> 126 #include <miscfs/specfs/specdev.h> 127 128 #include <dev/dkvar.h> 129 #include <dev/vndvar.h> 130 131 #include "ioconf.h" 132 133 #if defined(VNDDEBUG) && !defined(DEBUG) 134 #define DEBUG 135 #endif 136 137 #ifdef DEBUG 138 int dovndcluster = 1; 139 #define VDB_FOLLOW 0x01 140 #define VDB_INIT 0x02 141 #define VDB_IO 0x04 142 #define VDB_LABEL 0x08 143 int vnddebug = 0; 144 #endif 145 146 #define vndunit(x) DISKUNIT(x) 147 148 struct vndxfer { 149 struct buf vx_buf; 150 struct vnd_softc *vx_vnd; 151 }; 152 #define VND_BUFTOXFER(bp) ((struct vndxfer *)(void *)bp) 153 154 #define VND_GETXFER(vnd) pool_get(&(vnd)->sc_vxpool, PR_WAITOK) 155 #define VND_PUTXFER(vnd, vx) pool_put(&(vnd)->sc_vxpool, (vx)) 156 157 #define VNDLABELDEV(dev) \ 158 (MAKEDISKDEV(major((dev)), vndunit((dev)), RAW_PART)) 159 160 #define VND_MAXPENDING(vnd) ((vnd)->sc_maxactive * 4) 161 162 163 static void vndclear(struct vnd_softc *, int); 164 static int vnddoclear(struct vnd_softc *, int, int, bool); 165 static int vndsetcred(struct vnd_softc *, kauth_cred_t); 166 static void vndthrottle(struct vnd_softc *, struct vnode *); 167 static void vndiodone(struct buf *); 168 #if 0 169 static void vndshutdown(void); 170 #endif 171 172 static void vndgetdefaultlabel(struct vnd_softc *, struct disklabel *); 173 static void vndgetdisklabel(dev_t, struct vnd_softc *); 174 175 static int vndlock(struct vnd_softc *); 176 static void vndunlock(struct vnd_softc *); 177 #ifdef VND_COMPRESSION 178 static void compstrategy(struct buf *, off_t); 179 static void *vnd_alloc(void *, u_int, u_int); 180 static void vnd_free(void *, void *); 181 #endif /* VND_COMPRESSION */ 182 183 static void vndthread(void *); 184 static bool vnode_has_op(const struct vnode *, int); 185 static void handle_with_rdwr(struct vnd_softc *, const struct buf *, 186 struct buf *); 187 static void handle_with_strategy(struct vnd_softc *, const struct buf *, 188 struct buf *); 189 static void vnd_set_geometry(struct vnd_softc *); 190 191 static dev_type_open(vndopen); 192 static dev_type_close(vndclose); 193 static dev_type_read(vndread); 194 static dev_type_write(vndwrite); 195 static dev_type_ioctl(vndioctl); 196 static dev_type_strategy(vndstrategy); 197 static dev_type_dump(vnddump); 198 static dev_type_size(vndsize); 199 200 const struct bdevsw vnd_bdevsw = { 201 .d_open = vndopen, 202 .d_close = vndclose, 203 .d_strategy = vndstrategy, 204 .d_ioctl = vndioctl, 205 .d_dump = vnddump, 206 .d_psize = vndsize, 207 .d_discard = nodiscard, 208 .d_flag = D_DISK 209 }; 210 211 const struct cdevsw vnd_cdevsw = { 212 .d_open = vndopen, 213 .d_close = vndclose, 214 .d_read = vndread, 215 .d_write = vndwrite, 216 .d_ioctl = vndioctl, 217 .d_stop = nostop, 218 .d_tty = notty, 219 .d_poll = nopoll, 220 .d_mmap = nommap, 221 .d_kqfilter = nokqfilter, 222 .d_discard = nodiscard, 223 .d_flag = D_DISK 224 }; 225 226 static int vnd_match(device_t, cfdata_t, void *); 227 static void vnd_attach(device_t, device_t, void *); 228 static int vnd_detach(device_t, int); 229 230 CFATTACH_DECL3_NEW(vnd, sizeof(struct vnd_softc), 231 vnd_match, vnd_attach, vnd_detach, NULL, NULL, NULL, DVF_DETACH_SHUTDOWN); 232 extern struct cfdriver vnd_cd; 233 234 static struct vnd_softc *vnd_spawn(int); 235 int vnd_destroy(device_t); 236 237 static struct dkdriver vnddkdriver = { 238 .d_strategy = vndstrategy, 239 .d_minphys = minphys 240 }; 241 242 void 243 vndattach(int num) 244 { 245 int error; 246 247 error = config_cfattach_attach(vnd_cd.cd_name, &vnd_ca); 248 if (error) 249 aprint_error("%s: unable to register cfattach, error = %d\n", 250 vnd_cd.cd_name, error); 251 } 252 253 static int 254 vnd_match(device_t self, cfdata_t cfdata, void *aux) 255 { 256 257 return 1; 258 } 259 260 static void 261 vnd_attach(device_t parent, device_t self, void *aux) 262 { 263 struct vnd_softc *sc = device_private(self); 264 265 sc->sc_dev = self; 266 sc->sc_comp_offsets = NULL; 267 sc->sc_comp_buff = NULL; 268 sc->sc_comp_decombuf = NULL; 269 bufq_alloc(&sc->sc_tab, "disksort", BUFQ_SORT_RAWBLOCK); 270 disk_init(&sc->sc_dkdev, device_xname(self), &vnddkdriver); 271 if (!pmf_device_register(self, NULL, NULL)) 272 aprint_error_dev(self, "couldn't establish power handler\n"); 273 } 274 275 static int 276 vnd_detach(device_t self, int flags) 277 { 278 int error; 279 struct vnd_softc *sc = device_private(self); 280 281 if (sc->sc_flags & VNF_INITED) { 282 error = vnddoclear(sc, 0, -1, (flags & DETACH_FORCE) != 0); 283 if (error != 0) 284 return error; 285 } 286 287 pmf_device_deregister(self); 288 bufq_free(sc->sc_tab); 289 disk_destroy(&sc->sc_dkdev); 290 291 return 0; 292 } 293 294 static struct vnd_softc * 295 vnd_spawn(int unit) 296 { 297 cfdata_t cf; 298 299 cf = malloc(sizeof(*cf), M_DEVBUF, M_WAITOK); 300 cf->cf_name = vnd_cd.cd_name; 301 cf->cf_atname = vnd_cd.cd_name; 302 cf->cf_unit = unit; 303 cf->cf_fstate = FSTATE_STAR; 304 305 return device_private(config_attach_pseudo(cf)); 306 } 307 308 int 309 vnd_destroy(device_t dev) 310 { 311 int error; 312 cfdata_t cf; 313 314 cf = device_cfdata(dev); 315 error = config_detach(dev, DETACH_QUIET); 316 if (error) 317 return error; 318 free(cf, M_DEVBUF); 319 return 0; 320 } 321 322 static int 323 vndopen(dev_t dev, int flags, int mode, struct lwp *l) 324 { 325 int unit = vndunit(dev); 326 struct vnd_softc *sc; 327 int error = 0, part, pmask; 328 struct disklabel *lp; 329 330 #ifdef DEBUG 331 if (vnddebug & VDB_FOLLOW) 332 printf("vndopen(0x%"PRIx64", 0x%x, 0x%x, %p)\n", dev, flags, mode, l); 333 #endif 334 sc = device_lookup_private(&vnd_cd, unit); 335 if (sc == NULL) { 336 sc = vnd_spawn(unit); 337 if (sc == NULL) 338 return ENOMEM; 339 340 /* compatibility, keep disklabel after close */ 341 sc->sc_flags = VNF_KLABEL; 342 } 343 344 if ((error = vndlock(sc)) != 0) 345 return error; 346 347 mutex_enter(&sc->sc_dkdev.dk_openlock); 348 349 if ((sc->sc_flags & VNF_CLEARING) != 0) { 350 error = ENXIO; 351 goto done; 352 } 353 354 lp = sc->sc_dkdev.dk_label; 355 356 part = DISKPART(dev); 357 pmask = (1 << part); 358 359 if (sc->sc_dkdev.dk_nwedges != 0 && part != RAW_PART) { 360 error = EBUSY; 361 goto done; 362 } 363 364 if (sc->sc_flags & VNF_INITED) { 365 if ((sc->sc_dkdev.dk_openmask & ~(1<<RAW_PART)) != 0) { 366 /* 367 * If any non-raw partition is open, but the disk 368 * has been invalidated, disallow further opens. 369 */ 370 if ((sc->sc_flags & VNF_VLABEL) == 0) { 371 error = EIO; 372 goto done; 373 } 374 } else { 375 /* 376 * Load the partition info if not already loaded. 377 */ 378 if ((sc->sc_flags & VNF_VLABEL) == 0) { 379 sc->sc_flags |= VNF_VLABEL; 380 vndgetdisklabel(dev, sc); 381 } 382 } 383 } 384 385 /* Check that the partitions exists. */ 386 if (part != RAW_PART) { 387 if (((sc->sc_flags & VNF_INITED) == 0) || 388 ((part >= lp->d_npartitions) || 389 (lp->d_partitions[part].p_fstype == FS_UNUSED))) { 390 error = ENXIO; 391 goto done; 392 } 393 } 394 395 /* Prevent our unit from being unconfigured while open. */ 396 switch (mode) { 397 case S_IFCHR: 398 sc->sc_dkdev.dk_copenmask |= pmask; 399 break; 400 401 case S_IFBLK: 402 sc->sc_dkdev.dk_bopenmask |= pmask; 403 break; 404 } 405 sc->sc_dkdev.dk_openmask = 406 sc->sc_dkdev.dk_copenmask | sc->sc_dkdev.dk_bopenmask; 407 408 done: 409 mutex_exit(&sc->sc_dkdev.dk_openlock); 410 vndunlock(sc); 411 return error; 412 } 413 414 static int 415 vndclose(dev_t dev, int flags, int mode, struct lwp *l) 416 { 417 int unit = vndunit(dev); 418 struct vnd_softc *sc; 419 int error = 0, part; 420 421 #ifdef DEBUG 422 if (vnddebug & VDB_FOLLOW) 423 printf("vndclose(0x%"PRIx64", 0x%x, 0x%x, %p)\n", dev, flags, mode, l); 424 #endif 425 sc = device_lookup_private(&vnd_cd, unit); 426 if (sc == NULL) 427 return ENXIO; 428 429 if ((error = vndlock(sc)) != 0) 430 return error; 431 432 mutex_enter(&sc->sc_dkdev.dk_openlock); 433 434 part = DISKPART(dev); 435 436 /* ...that much closer to allowing unconfiguration... */ 437 switch (mode) { 438 case S_IFCHR: 439 sc->sc_dkdev.dk_copenmask &= ~(1 << part); 440 break; 441 442 case S_IFBLK: 443 sc->sc_dkdev.dk_bopenmask &= ~(1 << part); 444 break; 445 } 446 sc->sc_dkdev.dk_openmask = 447 sc->sc_dkdev.dk_copenmask | sc->sc_dkdev.dk_bopenmask; 448 449 /* are we last opener ? */ 450 if (sc->sc_dkdev.dk_openmask == 0) { 451 if ((sc->sc_flags & VNF_KLABEL) == 0) 452 sc->sc_flags &= ~VNF_VLABEL; 453 } 454 455 mutex_exit(&sc->sc_dkdev.dk_openlock); 456 457 vndunlock(sc); 458 459 if ((sc->sc_flags & VNF_INITED) == 0) { 460 if ((error = vnd_destroy(sc->sc_dev)) != 0) { 461 aprint_error_dev(sc->sc_dev, 462 "unable to detach instance\n"); 463 return error; 464 } 465 } 466 467 return 0; 468 } 469 470 /* 471 * Queue the request, and wakeup the kernel thread to handle it. 472 */ 473 static void 474 vndstrategy(struct buf *bp) 475 { 476 int unit = vndunit(bp->b_dev); 477 struct vnd_softc *vnd = 478 device_lookup_private(&vnd_cd, unit); 479 struct disklabel *lp; 480 daddr_t blkno; 481 int s = splbio(); 482 483 if (vnd == NULL) { 484 bp->b_error = ENXIO; 485 goto done; 486 } 487 lp = vnd->sc_dkdev.dk_label; 488 489 if ((vnd->sc_flags & VNF_INITED) == 0) { 490 bp->b_error = ENXIO; 491 goto done; 492 } 493 494 /* 495 * The transfer must be a whole number of blocks. 496 */ 497 if ((bp->b_bcount % lp->d_secsize) != 0) { 498 bp->b_error = EINVAL; 499 goto done; 500 } 501 502 /* 503 * check if we're read-only. 504 */ 505 if ((vnd->sc_flags & VNF_READONLY) && !(bp->b_flags & B_READ)) { 506 bp->b_error = EACCES; 507 goto done; 508 } 509 510 /* If it's a nil transfer, wake up the top half now. */ 511 if (bp->b_bcount == 0) { 512 goto done; 513 } 514 515 /* 516 * Do bounds checking and adjust transfer. If there's an error, 517 * the bounds check will flag that for us. 518 */ 519 if (DISKPART(bp->b_dev) == RAW_PART) { 520 if (bounds_check_with_mediasize(bp, DEV_BSIZE, 521 vnd->sc_size) <= 0) 522 goto done; 523 } else { 524 if (bounds_check_with_label(&vnd->sc_dkdev, 525 bp, vnd->sc_flags & (VNF_WLABEL|VNF_LABELLING)) <= 0) 526 goto done; 527 } 528 529 /* 530 * Put the block number in terms of the logical blocksize 531 * of the "device". 532 */ 533 534 blkno = bp->b_blkno / (lp->d_secsize / DEV_BSIZE); 535 536 /* 537 * Translate the partition-relative block number to an absolute. 538 */ 539 if (DISKPART(bp->b_dev) != RAW_PART) { 540 struct partition *pp; 541 542 pp = &vnd->sc_dkdev.dk_label->d_partitions[ 543 DISKPART(bp->b_dev)]; 544 blkno += pp->p_offset; 545 } 546 bp->b_rawblkno = blkno; 547 548 #ifdef DEBUG 549 if (vnddebug & VDB_FOLLOW) 550 printf("vndstrategy(%p): unit %d\n", bp, unit); 551 #endif 552 if ((vnd->sc_flags & VNF_USE_VN_RDWR)) { 553 KASSERT(vnd->sc_pending >= 0 && 554 vnd->sc_pending <= VND_MAXPENDING(vnd)); 555 while (vnd->sc_pending == VND_MAXPENDING(vnd)) 556 tsleep(&vnd->sc_pending, PRIBIO, "vndpc", 0); 557 vnd->sc_pending++; 558 } 559 bufq_put(vnd->sc_tab, bp); 560 wakeup(&vnd->sc_tab); 561 splx(s); 562 return; 563 564 done: 565 bp->b_resid = bp->b_bcount; 566 biodone(bp); 567 splx(s); 568 } 569 570 static bool 571 vnode_has_strategy(struct vnd_softc *vnd) 572 { 573 return vnode_has_op(vnd->sc_vp, VOFFSET(vop_bmap)) && 574 vnode_has_op(vnd->sc_vp, VOFFSET(vop_strategy)); 575 } 576 577 static bool 578 vnode_has_large_blocks(struct vnd_softc *vnd) 579 { 580 u_int32_t vnd_secsize, mnt_secsize; 581 uint64_t numsec; 582 unsigned secsize; 583 584 if (getdisksize(vnd->sc_vp, &numsec, &secsize)) 585 return true; 586 587 vnd_secsize = vnd->sc_geom.vng_secsize; 588 mnt_secsize = secsize; 589 590 return vnd_secsize % mnt_secsize != 0; 591 } 592 593 /* XXX this function needs a reliable check to detect 594 * sparse files. Otherwise, bmap/strategy may be used 595 * and fail on non-allocated blocks. VOP_READ/VOP_WRITE 596 * works on sparse files. 597 */ 598 #if notyet 599 static bool 600 vnode_strategy_probe(struct vnd_softc *vnd) 601 { 602 int error; 603 daddr_t nbn; 604 605 if (!vnode_has_strategy(vnd)) 606 return false; 607 608 if (vnode_has_large_blocks(vnd)) 609 return false; 610 611 /* Convert the first logical block number to its 612 * physical block number. 613 */ 614 error = 0; 615 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 616 error = VOP_BMAP(vnd->sc_vp, 0, NULL, &nbn, NULL); 617 VOP_UNLOCK(vnd->sc_vp); 618 619 /* Test if that worked. */ 620 if (error == 0 && (long)nbn == -1) 621 return false; 622 623 return true; 624 } 625 #endif 626 627 static void 628 vndthread(void *arg) 629 { 630 struct vnd_softc *vnd = arg; 631 int s; 632 633 /* Determine whether we can *use* VOP_BMAP and VOP_STRATEGY to 634 * directly access the backing vnode. If we can, use these two 635 * operations to avoid messing with the local buffer cache. 636 * Otherwise fall back to regular VOP_READ/VOP_WRITE operations 637 * which are guaranteed to work with any file system. */ 638 if ((vnd->sc_flags & VNF_USE_VN_RDWR) == 0 && 639 ! vnode_has_strategy(vnd)) 640 vnd->sc_flags |= VNF_USE_VN_RDWR; 641 642 /* VOP_STRATEGY can only be used if the backing vnode allows 643 * to access blocks as small as defined by the vnd geometry. 644 */ 645 if ((vnd->sc_flags & VNF_USE_VN_RDWR) == 0 && 646 vnode_has_large_blocks(vnd)) 647 vnd->sc_flags |= VNF_USE_VN_RDWR; 648 649 #ifdef DEBUG 650 if (vnddebug & VDB_INIT) 651 printf("vndthread: vp %p, %s\n", vnd->sc_vp, 652 (vnd->sc_flags & VNF_USE_VN_RDWR) == 0 ? 653 "using bmap/strategy operations" : 654 "using read/write operations"); 655 #endif 656 657 s = splbio(); 658 vnd->sc_flags |= VNF_KTHREAD; 659 wakeup(&vnd->sc_kthread); 660 661 /* 662 * Dequeue requests and serve them depending on the available 663 * vnode operations. 664 */ 665 while ((vnd->sc_flags & VNF_VUNCONF) == 0) { 666 struct vndxfer *vnx; 667 struct buf *obp; 668 struct buf *bp; 669 670 obp = bufq_get(vnd->sc_tab); 671 if (obp == NULL) { 672 tsleep(&vnd->sc_tab, PRIBIO, "vndbp", 0); 673 continue; 674 }; 675 if ((vnd->sc_flags & VNF_USE_VN_RDWR)) { 676 KASSERT(vnd->sc_pending > 0 && 677 vnd->sc_pending <= VND_MAXPENDING(vnd)); 678 if (vnd->sc_pending-- == VND_MAXPENDING(vnd)) 679 wakeup(&vnd->sc_pending); 680 } 681 splx(s); 682 #ifdef DEBUG 683 if (vnddebug & VDB_FOLLOW) 684 printf("vndthread(%p)\n", obp); 685 #endif 686 687 if (vnd->sc_vp->v_mount == NULL) { 688 obp->b_error = ENXIO; 689 goto done; 690 } 691 #ifdef VND_COMPRESSION 692 /* handle a compressed read */ 693 if ((obp->b_flags & B_READ) != 0 && (vnd->sc_flags & VNF_COMP)) { 694 off_t bn; 695 696 /* Convert to a byte offset within the file. */ 697 bn = obp->b_rawblkno * 698 vnd->sc_dkdev.dk_label->d_secsize; 699 700 compstrategy(obp, bn); 701 goto done; 702 } 703 #endif /* VND_COMPRESSION */ 704 705 /* 706 * Allocate a header for this transfer and link it to the 707 * buffer 708 */ 709 s = splbio(); 710 vnx = VND_GETXFER(vnd); 711 splx(s); 712 vnx->vx_vnd = vnd; 713 714 s = splbio(); 715 while (vnd->sc_active >= vnd->sc_maxactive) { 716 tsleep(&vnd->sc_tab, PRIBIO, "vndac", 0); 717 } 718 vnd->sc_active++; 719 splx(s); 720 721 /* Instrumentation. */ 722 disk_busy(&vnd->sc_dkdev); 723 724 bp = &vnx->vx_buf; 725 buf_init(bp); 726 bp->b_flags = (obp->b_flags & B_READ); 727 bp->b_oflags = obp->b_oflags; 728 bp->b_cflags = obp->b_cflags; 729 bp->b_iodone = vndiodone; 730 bp->b_private = obp; 731 bp->b_vp = vnd->sc_vp; 732 bp->b_objlock = bp->b_vp->v_interlock; 733 bp->b_data = obp->b_data; 734 bp->b_bcount = obp->b_bcount; 735 BIO_COPYPRIO(bp, obp); 736 737 /* Handle the request using the appropriate operations. */ 738 if ((vnd->sc_flags & VNF_USE_VN_RDWR) == 0) 739 handle_with_strategy(vnd, obp, bp); 740 else 741 handle_with_rdwr(vnd, obp, bp); 742 743 s = splbio(); 744 continue; 745 746 done: 747 biodone(obp); 748 s = splbio(); 749 } 750 751 vnd->sc_flags &= (~VNF_KTHREAD | VNF_VUNCONF); 752 wakeup(&vnd->sc_kthread); 753 splx(s); 754 kthread_exit(0); 755 } 756 757 /* 758 * Checks if the given vnode supports the requested operation. 759 * The operation is specified the offset returned by VOFFSET. 760 * 761 * XXX The test below used to determine this is quite fragile 762 * because it relies on the file system to use genfs to specify 763 * unimplemented operations. There might be another way to do 764 * it more cleanly. 765 */ 766 static bool 767 vnode_has_op(const struct vnode *vp, int opoffset) 768 { 769 int (*defaultp)(void *); 770 int (*opp)(void *); 771 772 defaultp = vp->v_op[VOFFSET(vop_default)]; 773 opp = vp->v_op[opoffset]; 774 775 return opp != defaultp && opp != genfs_eopnotsupp && 776 opp != genfs_badop && opp != genfs_nullop; 777 } 778 779 /* 780 * Handles the read/write request given in 'bp' using the vnode's VOP_READ 781 * and VOP_WRITE operations. 782 * 783 * 'obp' is a pointer to the original request fed to the vnd device. 784 */ 785 static void 786 handle_with_rdwr(struct vnd_softc *vnd, const struct buf *obp, struct buf *bp) 787 { 788 bool doread; 789 off_t offset; 790 size_t len, resid; 791 struct vnode *vp; 792 793 doread = bp->b_flags & B_READ; 794 offset = obp->b_rawblkno * vnd->sc_dkdev.dk_label->d_secsize; 795 len = bp->b_bcount; 796 vp = vnd->sc_vp; 797 798 #if defined(DEBUG) 799 if (vnddebug & VDB_IO) 800 printf("vnd (rdwr): vp %p, %s, rawblkno 0x%" PRIx64 801 ", secsize %d, offset %" PRIu64 802 ", bcount %d\n", 803 vp, doread ? "read" : "write", obp->b_rawblkno, 804 vnd->sc_dkdev.dk_label->d_secsize, offset, 805 bp->b_bcount); 806 #endif 807 808 /* Issue the read or write operation. */ 809 bp->b_error = 810 vn_rdwr(doread ? UIO_READ : UIO_WRITE, 811 vp, bp->b_data, len, offset, UIO_SYSSPACE, 812 IO_ADV_ENCODE(POSIX_FADV_NOREUSE), vnd->sc_cred, &resid, NULL); 813 bp->b_resid = resid; 814 815 mutex_enter(vp->v_interlock); 816 (void) VOP_PUTPAGES(vp, 0, 0, 817 PGO_ALLPAGES | PGO_CLEANIT | PGO_FREE | PGO_SYNCIO); 818 819 /* We need to increase the number of outputs on the vnode if 820 * there was any write to it. */ 821 if (!doread) { 822 mutex_enter(vp->v_interlock); 823 vp->v_numoutput++; 824 mutex_exit(vp->v_interlock); 825 } 826 827 biodone(bp); 828 } 829 830 /* 831 * Handes the read/write request given in 'bp' using the vnode's VOP_BMAP 832 * and VOP_STRATEGY operations. 833 * 834 * 'obp' is a pointer to the original request fed to the vnd device. 835 */ 836 static void 837 handle_with_strategy(struct vnd_softc *vnd, const struct buf *obp, 838 struct buf *bp) 839 { 840 int bsize, error, flags, skipped; 841 size_t resid, sz; 842 off_t bn, offset; 843 struct vnode *vp; 844 struct buf *nbp = NULL; 845 846 flags = obp->b_flags; 847 848 849 /* convert to a byte offset within the file. */ 850 bn = obp->b_rawblkno * vnd->sc_dkdev.dk_label->d_secsize; 851 852 bsize = vnd->sc_vp->v_mount->mnt_stat.f_iosize; 853 skipped = 0; 854 855 /* 856 * Break the request into bsize pieces and feed them 857 * sequentially using VOP_BMAP/VOP_STRATEGY. 858 * We do it this way to keep from flooding NFS servers if we 859 * are connected to an NFS file. This places the burden on 860 * the client rather than the server. 861 */ 862 error = 0; 863 bp->b_resid = bp->b_bcount; 864 for (offset = 0, resid = bp->b_resid; /* true */; 865 resid -= sz, offset += sz) { 866 daddr_t nbn; 867 int off, nra; 868 869 nra = 0; 870 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 871 error = VOP_BMAP(vnd->sc_vp, bn / bsize, &vp, &nbn, &nra); 872 VOP_UNLOCK(vnd->sc_vp); 873 874 if (error == 0 && (long)nbn == -1) 875 error = EIO; 876 877 /* 878 * If there was an error or a hole in the file...punt. 879 * Note that we may have to wait for any operations 880 * that we have already fired off before releasing 881 * the buffer. 882 * 883 * XXX we could deal with holes here but it would be 884 * a hassle (in the write case). 885 */ 886 if (error) { 887 skipped += resid; 888 break; 889 } 890 891 #ifdef DEBUG 892 if (!dovndcluster) 893 nra = 0; 894 #endif 895 896 off = bn % bsize; 897 sz = MIN(((off_t)1 + nra) * bsize - off, resid); 898 #ifdef DEBUG 899 if (vnddebug & VDB_IO) 900 printf("vndstrategy: vp %p/%p bn 0x%qx/0x%" PRIx64 901 " sz 0x%zx\n", vnd->sc_vp, vp, (long long)bn, 902 nbn, sz); 903 #endif 904 905 nbp = getiobuf(vp, true); 906 nestiobuf_setup(bp, nbp, offset, sz); 907 nbp->b_blkno = nbn + btodb(off); 908 909 #if 0 /* XXX #ifdef DEBUG */ 910 if (vnddebug & VDB_IO) 911 printf("vndstart(%ld): bp %p vp %p blkno " 912 "0x%" PRIx64 " flags %x addr %p cnt 0x%x\n", 913 (long) (vnd-vnd_softc), &nbp->vb_buf, 914 nbp->vb_buf.b_vp, nbp->vb_buf.b_blkno, 915 nbp->vb_buf.b_flags, nbp->vb_buf.b_data, 916 nbp->vb_buf.b_bcount); 917 #endif 918 if (resid == sz) { 919 break; 920 } 921 VOP_STRATEGY(vp, nbp); 922 bn += sz; 923 } 924 if (!(flags & B_READ)) { 925 struct vnode *w_vp; 926 /* 927 * this is the last nested buf, account for 928 * the parent buf write too. 929 * This has to be done last, so that 930 * fsync won't wait for this write which 931 * has no chance to complete before all nested bufs 932 * have been queued. But it has to be done 933 * before the last VOP_STRATEGY() 934 * or the call to nestiobuf_done(). 935 */ 936 w_vp = bp->b_vp; 937 mutex_enter(w_vp->v_interlock); 938 w_vp->v_numoutput++; 939 mutex_exit(w_vp->v_interlock); 940 } 941 KASSERT(skipped != 0 || nbp != NULL); 942 if (skipped) 943 nestiobuf_done(bp, skipped, error); 944 else 945 VOP_STRATEGY(vp, nbp); 946 } 947 948 static void 949 vndiodone(struct buf *bp) 950 { 951 struct vndxfer *vnx = VND_BUFTOXFER(bp); 952 struct vnd_softc *vnd = vnx->vx_vnd; 953 struct buf *obp = bp->b_private; 954 int s = splbio(); 955 956 KASSERT(&vnx->vx_buf == bp); 957 KASSERT(vnd->sc_active > 0); 958 #ifdef DEBUG 959 if (vnddebug & VDB_IO) { 960 printf("vndiodone1: bp %p iodone: error %d\n", 961 bp, bp->b_error); 962 } 963 #endif 964 disk_unbusy(&vnd->sc_dkdev, bp->b_bcount - bp->b_resid, 965 (bp->b_flags & B_READ)); 966 vnd->sc_active--; 967 if (vnd->sc_active == 0) { 968 wakeup(&vnd->sc_tab); 969 } 970 splx(s); 971 obp->b_error = bp->b_error; 972 obp->b_resid = bp->b_resid; 973 buf_destroy(bp); 974 VND_PUTXFER(vnd, vnx); 975 biodone(obp); 976 } 977 978 /* ARGSUSED */ 979 static int 980 vndread(dev_t dev, struct uio *uio, int flags) 981 { 982 int unit = vndunit(dev); 983 struct vnd_softc *sc; 984 985 #ifdef DEBUG 986 if (vnddebug & VDB_FOLLOW) 987 printf("vndread(0x%"PRIx64", %p)\n", dev, uio); 988 #endif 989 990 sc = device_lookup_private(&vnd_cd, unit); 991 if (sc == NULL) 992 return ENXIO; 993 994 if ((sc->sc_flags & VNF_INITED) == 0) 995 return ENXIO; 996 997 return physio(vndstrategy, NULL, dev, B_READ, minphys, uio); 998 } 999 1000 /* ARGSUSED */ 1001 static int 1002 vndwrite(dev_t dev, struct uio *uio, int flags) 1003 { 1004 int unit = vndunit(dev); 1005 struct vnd_softc *sc; 1006 1007 #ifdef DEBUG 1008 if (vnddebug & VDB_FOLLOW) 1009 printf("vndwrite(0x%"PRIx64", %p)\n", dev, uio); 1010 #endif 1011 1012 sc = device_lookup_private(&vnd_cd, unit); 1013 if (sc == NULL) 1014 return ENXIO; 1015 1016 if ((sc->sc_flags & VNF_INITED) == 0) 1017 return ENXIO; 1018 1019 return physio(vndstrategy, NULL, dev, B_WRITE, minphys, uio); 1020 } 1021 1022 static int 1023 vnd_cget(struct lwp *l, int unit, int *un, struct vattr *va) 1024 { 1025 int error; 1026 struct vnd_softc *vnd; 1027 1028 if (*un == -1) 1029 *un = unit; 1030 if (*un < 0) 1031 return EINVAL; 1032 1033 vnd = device_lookup_private(&vnd_cd, *un); 1034 if (vnd == NULL) 1035 return -1; 1036 1037 if ((vnd->sc_flags & VNF_INITED) == 0) 1038 return -1; 1039 1040 vn_lock(vnd->sc_vp, LK_SHARED | LK_RETRY); 1041 error = VOP_GETATTR(vnd->sc_vp, va, l->l_cred); 1042 VOP_UNLOCK(vnd->sc_vp); 1043 return error; 1044 } 1045 1046 static int 1047 vnddoclear(struct vnd_softc *vnd, int pmask, int minor, bool force) 1048 { 1049 int error; 1050 1051 if ((error = vndlock(vnd)) != 0) 1052 return error; 1053 1054 /* 1055 * Don't unconfigure if any other partitions are open 1056 * or if both the character and block flavors of this 1057 * partition are open. 1058 */ 1059 if (DK_BUSY(vnd, pmask) && !force) { 1060 vndunlock(vnd); 1061 return EBUSY; 1062 } 1063 1064 /* Delete all of our wedges */ 1065 dkwedge_delall(&vnd->sc_dkdev); 1066 1067 /* 1068 * XXX vndclear() might call vndclose() implicitly; 1069 * release lock to avoid recursion 1070 * 1071 * Set VNF_CLEARING to prevent vndopen() from 1072 * sneaking in after we vndunlock(). 1073 */ 1074 vnd->sc_flags |= VNF_CLEARING; 1075 vndunlock(vnd); 1076 vndclear(vnd, minor); 1077 #ifdef DEBUG 1078 if (vnddebug & VDB_INIT) 1079 printf("%s: CLRed\n", __func__); 1080 #endif 1081 1082 /* Destroy the xfer and buffer pools. */ 1083 pool_destroy(&vnd->sc_vxpool); 1084 1085 /* Detach the disk. */ 1086 disk_detach(&vnd->sc_dkdev); 1087 1088 return 0; 1089 } 1090 1091 static int 1092 vndioctl_get(struct lwp *l, void *data, int unit, struct vattr *va) 1093 { 1094 int error; 1095 1096 KASSERT(l); 1097 1098 /* the first member is always int vnd_unit in all the versions */ 1099 if (*(int *)data >= vnd_cd.cd_ndevs) 1100 return ENXIO; 1101 1102 switch (error = vnd_cget(l, unit, (int *)data, va)) { 1103 case -1: 1104 /* unused is not an error */ 1105 memset(va, 0, sizeof(*va)); 1106 /*FALLTHROUGH*/ 1107 case 0: 1108 return 0; 1109 default: 1110 return error; 1111 } 1112 } 1113 1114 /* ARGSUSED */ 1115 static int 1116 vndioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 1117 { 1118 bool force; 1119 int unit = vndunit(dev); 1120 struct vnd_softc *vnd; 1121 struct vnd_ioctl *vio; 1122 struct vattr vattr; 1123 struct pathbuf *pb; 1124 struct nameidata nd; 1125 int error, part, pmask; 1126 uint64_t geomsize; 1127 int fflags; 1128 #ifdef __HAVE_OLD_DISKLABEL 1129 struct disklabel newlabel; 1130 #endif 1131 1132 #ifdef DEBUG 1133 if (vnddebug & VDB_FOLLOW) 1134 printf("vndioctl(0x%"PRIx64", 0x%lx, %p, 0x%x, %p): unit %d\n", 1135 dev, cmd, data, flag, l->l_proc, unit); 1136 #endif 1137 /* Do the get's first; they don't need initialization or verification */ 1138 switch (cmd) { 1139 #ifdef COMPAT_30 1140 case VNDIOCGET30: { 1141 if ((error = vndioctl_get(l, data, unit, &vattr)) != 0) 1142 return error; 1143 1144 struct vnd_user30 *vnu = data; 1145 vnu->vnu_dev = vattr.va_fsid; 1146 vnu->vnu_ino = vattr.va_fileid; 1147 return 0; 1148 } 1149 #endif 1150 #ifdef COMPAT_50 1151 case VNDIOCGET50: { 1152 if ((error = vndioctl_get(l, data, unit, &vattr)) != 0) 1153 return error; 1154 1155 struct vnd_user50 *vnu = data; 1156 vnu->vnu_dev = vattr.va_fsid; 1157 vnu->vnu_ino = vattr.va_fileid; 1158 return 0; 1159 } 1160 #endif 1161 1162 case VNDIOCGET: { 1163 if ((error = vndioctl_get(l, data, unit, &vattr)) != 0) 1164 return error; 1165 1166 struct vnd_user *vnu = data; 1167 vnu->vnu_dev = vattr.va_fsid; 1168 vnu->vnu_ino = vattr.va_fileid; 1169 return 0; 1170 } 1171 default: 1172 break; 1173 } 1174 1175 vnd = device_lookup_private(&vnd_cd, unit); 1176 if (vnd == NULL) 1177 return ENXIO; 1178 vio = (struct vnd_ioctl *)data; 1179 1180 /* Must be open for writes for these commands... */ 1181 switch (cmd) { 1182 case VNDIOCSET: 1183 case VNDIOCCLR: 1184 #ifdef COMPAT_50 1185 case VNDIOCSET50: 1186 case VNDIOCCLR50: 1187 #endif 1188 case DIOCSDINFO: 1189 case DIOCWDINFO: 1190 #ifdef __HAVE_OLD_DISKLABEL 1191 case ODIOCSDINFO: 1192 case ODIOCWDINFO: 1193 #endif 1194 case DIOCKLABEL: 1195 case DIOCWLABEL: 1196 if ((flag & FWRITE) == 0) 1197 return EBADF; 1198 } 1199 1200 /* Must be initialized for these... */ 1201 switch (cmd) { 1202 case VNDIOCCLR: 1203 #ifdef VNDIOCCLR50 1204 case VNDIOCCLR50: 1205 #endif 1206 case DIOCGDINFO: 1207 case DIOCSDINFO: 1208 case DIOCWDINFO: 1209 case DIOCGPARTINFO: 1210 case DIOCKLABEL: 1211 case DIOCWLABEL: 1212 case DIOCGDEFLABEL: 1213 case DIOCCACHESYNC: 1214 #ifdef __HAVE_OLD_DISKLABEL 1215 case ODIOCGDINFO: 1216 case ODIOCSDINFO: 1217 case ODIOCWDINFO: 1218 case ODIOCGDEFLABEL: 1219 #endif 1220 if ((vnd->sc_flags & VNF_INITED) == 0) 1221 return ENXIO; 1222 } 1223 1224 error = disk_ioctl(&vnd->sc_dkdev, dev, cmd, data, flag, l); 1225 if (error != EPASSTHROUGH) 1226 return error; 1227 1228 1229 switch (cmd) { 1230 #ifdef VNDIOCSET50 1231 case VNDIOCSET50: 1232 #endif 1233 case VNDIOCSET: 1234 if (vnd->sc_flags & VNF_INITED) 1235 return EBUSY; 1236 1237 if ((error = vndlock(vnd)) != 0) 1238 return error; 1239 1240 fflags = FREAD; 1241 if ((vio->vnd_flags & VNDIOF_READONLY) == 0) 1242 fflags |= FWRITE; 1243 error = pathbuf_copyin(vio->vnd_file, &pb); 1244 if (error) { 1245 goto unlock_and_exit; 1246 } 1247 NDINIT(&nd, LOOKUP, FOLLOW, pb); 1248 if ((error = vn_open(&nd, fflags, 0)) != 0) { 1249 pathbuf_destroy(pb); 1250 goto unlock_and_exit; 1251 } 1252 KASSERT(l); 1253 error = VOP_GETATTR(nd.ni_vp, &vattr, l->l_cred); 1254 if (!error && nd.ni_vp->v_type != VREG) 1255 error = EOPNOTSUPP; 1256 if (!error && vattr.va_bytes < vattr.va_size) 1257 /* File is definitely sparse, use vn_rdwr() */ 1258 vnd->sc_flags |= VNF_USE_VN_RDWR; 1259 if (error) { 1260 VOP_UNLOCK(nd.ni_vp); 1261 goto close_and_exit; 1262 } 1263 1264 /* If using a compressed file, initialize its info */ 1265 /* (or abort with an error if kernel has no compression) */ 1266 if (vio->vnd_flags & VNF_COMP) { 1267 #ifdef VND_COMPRESSION 1268 struct vnd_comp_header *ch; 1269 int i; 1270 u_int32_t comp_size; 1271 u_int32_t comp_maxsize; 1272 1273 /* allocate space for compresed file header */ 1274 ch = malloc(sizeof(struct vnd_comp_header), 1275 M_TEMP, M_WAITOK); 1276 1277 /* read compressed file header */ 1278 error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)ch, 1279 sizeof(struct vnd_comp_header), 0, UIO_SYSSPACE, 1280 IO_UNIT|IO_NODELOCKED, l->l_cred, NULL, NULL); 1281 if (error) { 1282 free(ch, M_TEMP); 1283 VOP_UNLOCK(nd.ni_vp); 1284 goto close_and_exit; 1285 } 1286 1287 /* save some header info */ 1288 vnd->sc_comp_blksz = ntohl(ch->block_size); 1289 /* note last offset is the file byte size */ 1290 vnd->sc_comp_numoffs = ntohl(ch->num_blocks)+1; 1291 free(ch, M_TEMP); 1292 if (!DK_DEV_BSIZE_OK(vnd->sc_comp_blksz)) { 1293 VOP_UNLOCK(nd.ni_vp); 1294 error = EINVAL; 1295 goto close_and_exit; 1296 } 1297 if (sizeof(struct vnd_comp_header) + 1298 sizeof(u_int64_t) * vnd->sc_comp_numoffs > 1299 vattr.va_size) { 1300 VOP_UNLOCK(nd.ni_vp); 1301 error = EINVAL; 1302 goto close_and_exit; 1303 } 1304 1305 /* set decompressed file size */ 1306 vattr.va_size = 1307 ((u_quad_t)vnd->sc_comp_numoffs - 1) * 1308 (u_quad_t)vnd->sc_comp_blksz; 1309 1310 /* allocate space for all the compressed offsets */ 1311 vnd->sc_comp_offsets = 1312 malloc(sizeof(u_int64_t) * vnd->sc_comp_numoffs, 1313 M_DEVBUF, M_WAITOK); 1314 1315 /* read in the offsets */ 1316 error = vn_rdwr(UIO_READ, nd.ni_vp, 1317 (void *)vnd->sc_comp_offsets, 1318 sizeof(u_int64_t) * vnd->sc_comp_numoffs, 1319 sizeof(struct vnd_comp_header), UIO_SYSSPACE, 1320 IO_UNIT|IO_NODELOCKED, l->l_cred, NULL, NULL); 1321 if (error) { 1322 VOP_UNLOCK(nd.ni_vp); 1323 goto close_and_exit; 1324 } 1325 /* 1326 * find largest block size (used for allocation limit). 1327 * Also convert offset to native byte order. 1328 */ 1329 comp_maxsize = 0; 1330 for (i = 0; i < vnd->sc_comp_numoffs - 1; i++) { 1331 vnd->sc_comp_offsets[i] = 1332 be64toh(vnd->sc_comp_offsets[i]); 1333 comp_size = be64toh(vnd->sc_comp_offsets[i + 1]) 1334 - vnd->sc_comp_offsets[i]; 1335 if (comp_size > comp_maxsize) 1336 comp_maxsize = comp_size; 1337 } 1338 vnd->sc_comp_offsets[vnd->sc_comp_numoffs - 1] = 1339 be64toh(vnd->sc_comp_offsets[vnd->sc_comp_numoffs - 1]); 1340 1341 /* create compressed data buffer */ 1342 vnd->sc_comp_buff = malloc(comp_maxsize, 1343 M_DEVBUF, M_WAITOK); 1344 1345 /* create decompressed buffer */ 1346 vnd->sc_comp_decombuf = malloc(vnd->sc_comp_blksz, 1347 M_DEVBUF, M_WAITOK); 1348 vnd->sc_comp_buffblk = -1; 1349 1350 /* Initialize decompress stream */ 1351 memset(&vnd->sc_comp_stream, 0, sizeof(z_stream)); 1352 vnd->sc_comp_stream.zalloc = vnd_alloc; 1353 vnd->sc_comp_stream.zfree = vnd_free; 1354 error = inflateInit2(&vnd->sc_comp_stream, MAX_WBITS); 1355 if (error) { 1356 if (vnd->sc_comp_stream.msg) 1357 printf("vnd%d: compressed file, %s\n", 1358 unit, vnd->sc_comp_stream.msg); 1359 VOP_UNLOCK(nd.ni_vp); 1360 error = EINVAL; 1361 goto close_and_exit; 1362 } 1363 1364 vnd->sc_flags |= VNF_COMP | VNF_READONLY; 1365 #else /* !VND_COMPRESSION */ 1366 VOP_UNLOCK(nd.ni_vp); 1367 error = EOPNOTSUPP; 1368 goto close_and_exit; 1369 #endif /* VND_COMPRESSION */ 1370 } 1371 1372 VOP_UNLOCK(nd.ni_vp); 1373 vnd->sc_vp = nd.ni_vp; 1374 vnd->sc_size = btodb(vattr.va_size); /* note truncation */ 1375 1376 /* 1377 * Use pseudo-geometry specified. If none was provided, 1378 * use "standard" Adaptec fictitious geometry. 1379 */ 1380 if (vio->vnd_flags & VNDIOF_HASGEOM) { 1381 1382 memcpy(&vnd->sc_geom, &vio->vnd_geom, 1383 sizeof(vio->vnd_geom)); 1384 1385 /* 1386 * Sanity-check the sector size. 1387 */ 1388 if (!DK_DEV_BSIZE_OK(vnd->sc_geom.vng_secsize) || 1389 vnd->sc_geom.vng_ncylinders == 0 || 1390 vnd->sc_geom.vng_ntracks == 0 || 1391 vnd->sc_geom.vng_nsectors == 0) { 1392 error = EINVAL; 1393 goto close_and_exit; 1394 } 1395 1396 /* 1397 * Compute the size (in DEV_BSIZE blocks) specified 1398 * by the geometry. 1399 */ 1400 geomsize = (int64_t)vnd->sc_geom.vng_nsectors * 1401 vnd->sc_geom.vng_ntracks * 1402 vnd->sc_geom.vng_ncylinders * 1403 (vnd->sc_geom.vng_secsize / DEV_BSIZE); 1404 1405 /* 1406 * Sanity-check the size against the specified 1407 * geometry. 1408 */ 1409 if (vnd->sc_size < geomsize) { 1410 error = EINVAL; 1411 goto close_and_exit; 1412 } 1413 } else if (vnd->sc_size >= (32 * 64)) { 1414 /* 1415 * Size must be at least 2048 DEV_BSIZE blocks 1416 * (1M) in order to use this geometry. 1417 */ 1418 vnd->sc_geom.vng_secsize = DEV_BSIZE; 1419 vnd->sc_geom.vng_nsectors = 32; 1420 vnd->sc_geom.vng_ntracks = 64; 1421 vnd->sc_geom.vng_ncylinders = vnd->sc_size / (64 * 32); 1422 } else { 1423 vnd->sc_geom.vng_secsize = DEV_BSIZE; 1424 vnd->sc_geom.vng_nsectors = 1; 1425 vnd->sc_geom.vng_ntracks = 1; 1426 vnd->sc_geom.vng_ncylinders = vnd->sc_size; 1427 } 1428 1429 vnd_set_geometry(vnd); 1430 1431 if (vio->vnd_flags & VNDIOF_READONLY) { 1432 vnd->sc_flags |= VNF_READONLY; 1433 } 1434 1435 if ((error = vndsetcred(vnd, l->l_cred)) != 0) 1436 goto close_and_exit; 1437 1438 vndthrottle(vnd, vnd->sc_vp); 1439 vio->vnd_osize = dbtob(vnd->sc_size); 1440 #ifdef VNDIOCSET50 1441 if (cmd != VNDIOCSET50) 1442 #endif 1443 vio->vnd_size = dbtob(vnd->sc_size); 1444 vnd->sc_flags |= VNF_INITED; 1445 1446 /* create the kernel thread, wait for it to be up */ 1447 error = kthread_create(PRI_NONE, 0, NULL, vndthread, vnd, 1448 &vnd->sc_kthread, "%s", device_xname(vnd->sc_dev)); 1449 if (error) 1450 goto close_and_exit; 1451 while ((vnd->sc_flags & VNF_KTHREAD) == 0) { 1452 tsleep(&vnd->sc_kthread, PRIBIO, "vndthr", 0); 1453 } 1454 #ifdef DEBUG 1455 if (vnddebug & VDB_INIT) 1456 printf("vndioctl: SET vp %p size 0x%lx %d/%d/%d/%d\n", 1457 vnd->sc_vp, (unsigned long) vnd->sc_size, 1458 vnd->sc_geom.vng_secsize, 1459 vnd->sc_geom.vng_nsectors, 1460 vnd->sc_geom.vng_ntracks, 1461 vnd->sc_geom.vng_ncylinders); 1462 #endif 1463 1464 /* Attach the disk. */ 1465 disk_attach(&vnd->sc_dkdev); 1466 1467 /* Initialize the xfer and buffer pools. */ 1468 pool_init(&vnd->sc_vxpool, sizeof(struct vndxfer), 0, 1469 0, 0, "vndxpl", NULL, IPL_BIO); 1470 1471 vndunlock(vnd); 1472 1473 pathbuf_destroy(pb); 1474 1475 /* Discover wedges on this disk */ 1476 dkwedge_discover(&vnd->sc_dkdev); 1477 1478 break; 1479 1480 close_and_exit: 1481 (void) vn_close(nd.ni_vp, fflags, l->l_cred); 1482 pathbuf_destroy(pb); 1483 unlock_and_exit: 1484 #ifdef VND_COMPRESSION 1485 /* free any allocated memory (for compressed file) */ 1486 if (vnd->sc_comp_offsets) { 1487 free(vnd->sc_comp_offsets, M_DEVBUF); 1488 vnd->sc_comp_offsets = NULL; 1489 } 1490 if (vnd->sc_comp_buff) { 1491 free(vnd->sc_comp_buff, M_DEVBUF); 1492 vnd->sc_comp_buff = NULL; 1493 } 1494 if (vnd->sc_comp_decombuf) { 1495 free(vnd->sc_comp_decombuf, M_DEVBUF); 1496 vnd->sc_comp_decombuf = NULL; 1497 } 1498 #endif /* VND_COMPRESSION */ 1499 vndunlock(vnd); 1500 return error; 1501 1502 #ifdef VNDIOCCLR50 1503 case VNDIOCCLR50: 1504 #endif 1505 case VNDIOCCLR: 1506 part = DISKPART(dev); 1507 pmask = (1 << part); 1508 force = (vio->vnd_flags & VNDIOF_FORCE) != 0; 1509 1510 if ((error = vnddoclear(vnd, pmask, minor(dev), force)) != 0) 1511 return error; 1512 1513 break; 1514 1515 1516 case DIOCWDINFO: 1517 case DIOCSDINFO: 1518 #ifdef __HAVE_OLD_DISKLABEL 1519 case ODIOCWDINFO: 1520 case ODIOCSDINFO: 1521 #endif 1522 { 1523 struct disklabel *lp; 1524 1525 if ((error = vndlock(vnd)) != 0) 1526 return error; 1527 1528 vnd->sc_flags |= VNF_LABELLING; 1529 1530 #ifdef __HAVE_OLD_DISKLABEL 1531 if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) { 1532 memset(&newlabel, 0, sizeof newlabel); 1533 memcpy(&newlabel, data, sizeof (struct olddisklabel)); 1534 lp = &newlabel; 1535 } else 1536 #endif 1537 lp = (struct disklabel *)data; 1538 1539 error = setdisklabel(vnd->sc_dkdev.dk_label, 1540 lp, 0, vnd->sc_dkdev.dk_cpulabel); 1541 if (error == 0) { 1542 if (cmd == DIOCWDINFO 1543 #ifdef __HAVE_OLD_DISKLABEL 1544 || cmd == ODIOCWDINFO 1545 #endif 1546 ) 1547 error = writedisklabel(VNDLABELDEV(dev), 1548 vndstrategy, vnd->sc_dkdev.dk_label, 1549 vnd->sc_dkdev.dk_cpulabel); 1550 } 1551 1552 vnd->sc_flags &= ~VNF_LABELLING; 1553 1554 vndunlock(vnd); 1555 1556 if (error) 1557 return error; 1558 break; 1559 } 1560 1561 case DIOCKLABEL: 1562 if (*(int *)data != 0) 1563 vnd->sc_flags |= VNF_KLABEL; 1564 else 1565 vnd->sc_flags &= ~VNF_KLABEL; 1566 break; 1567 1568 case DIOCWLABEL: 1569 if (*(int *)data != 0) 1570 vnd->sc_flags |= VNF_WLABEL; 1571 else 1572 vnd->sc_flags &= ~VNF_WLABEL; 1573 break; 1574 1575 case DIOCGDEFLABEL: 1576 vndgetdefaultlabel(vnd, (struct disklabel *)data); 1577 break; 1578 1579 #ifdef __HAVE_OLD_DISKLABEL 1580 case ODIOCGDEFLABEL: 1581 vndgetdefaultlabel(vnd, &newlabel); 1582 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 1583 return ENOTTY; 1584 memcpy(data, &newlabel, sizeof (struct olddisklabel)); 1585 break; 1586 #endif 1587 1588 case DIOCCACHESYNC: 1589 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 1590 error = VOP_FSYNC(vnd->sc_vp, vnd->sc_cred, 1591 FSYNC_WAIT | FSYNC_DATAONLY | FSYNC_CACHE, 0, 0); 1592 VOP_UNLOCK(vnd->sc_vp); 1593 return error; 1594 1595 default: 1596 return ENOTTY; 1597 } 1598 1599 return 0; 1600 } 1601 1602 /* 1603 * Duplicate the current processes' credentials. Since we are called only 1604 * as the result of a SET ioctl and only root can do that, any future access 1605 * to this "disk" is essentially as root. Note that credentials may change 1606 * if some other uid can write directly to the mapped file (NFS). 1607 */ 1608 static int 1609 vndsetcred(struct vnd_softc *vnd, kauth_cred_t cred) 1610 { 1611 struct uio auio; 1612 struct iovec aiov; 1613 char *tmpbuf; 1614 int error; 1615 1616 vnd->sc_cred = kauth_cred_dup(cred); 1617 tmpbuf = malloc(DEV_BSIZE, M_TEMP, M_WAITOK); 1618 1619 /* XXX: Horrible kludge to establish credentials for NFS */ 1620 aiov.iov_base = tmpbuf; 1621 aiov.iov_len = min(DEV_BSIZE, dbtob(vnd->sc_size)); 1622 auio.uio_iov = &aiov; 1623 auio.uio_iovcnt = 1; 1624 auio.uio_offset = 0; 1625 auio.uio_rw = UIO_READ; 1626 auio.uio_resid = aiov.iov_len; 1627 UIO_SETUP_SYSSPACE(&auio); 1628 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 1629 error = VOP_READ(vnd->sc_vp, &auio, 0, vnd->sc_cred); 1630 if (error == 0) { 1631 /* 1632 * Because vnd does all IO directly through the vnode 1633 * we need to flush (at least) the buffer from the above 1634 * VOP_READ from the buffer cache to prevent cache 1635 * incoherencies. Also, be careful to write dirty 1636 * buffers back to stable storage. 1637 */ 1638 error = vinvalbuf(vnd->sc_vp, V_SAVE, vnd->sc_cred, 1639 curlwp, 0, 0); 1640 } 1641 VOP_UNLOCK(vnd->sc_vp); 1642 1643 free(tmpbuf, M_TEMP); 1644 return error; 1645 } 1646 1647 /* 1648 * Set maxactive based on FS type 1649 */ 1650 static void 1651 vndthrottle(struct vnd_softc *vnd, struct vnode *vp) 1652 { 1653 1654 if (vp->v_tag == VT_NFS) 1655 vnd->sc_maxactive = 2; 1656 else 1657 vnd->sc_maxactive = 8; 1658 1659 if (vnd->sc_maxactive < 1) 1660 vnd->sc_maxactive = 1; 1661 } 1662 1663 #if 0 1664 static void 1665 vndshutdown(void) 1666 { 1667 struct vnd_softc *vnd; 1668 1669 for (vnd = &vnd_softc[0]; vnd < &vnd_softc[numvnd]; vnd++) 1670 if (vnd->sc_flags & VNF_INITED) 1671 vndclear(vnd); 1672 } 1673 #endif 1674 1675 static void 1676 vndclear(struct vnd_softc *vnd, int myminor) 1677 { 1678 struct vnode *vp = vnd->sc_vp; 1679 int fflags = FREAD; 1680 int bmaj, cmaj, i, mn; 1681 int s; 1682 1683 #ifdef DEBUG 1684 if (vnddebug & VDB_FOLLOW) 1685 printf("vndclear(%p): vp %p\n", vnd, vp); 1686 #endif 1687 /* locate the major number */ 1688 bmaj = bdevsw_lookup_major(&vnd_bdevsw); 1689 cmaj = cdevsw_lookup_major(&vnd_cdevsw); 1690 1691 /* Nuke the vnodes for any open instances */ 1692 for (i = 0; i < MAXPARTITIONS; i++) { 1693 mn = DISKMINOR(device_unit(vnd->sc_dev), i); 1694 vdevgone(bmaj, mn, mn, VBLK); 1695 if (mn != myminor) /* XXX avoid to kill own vnode */ 1696 vdevgone(cmaj, mn, mn, VCHR); 1697 } 1698 1699 if ((vnd->sc_flags & VNF_READONLY) == 0) 1700 fflags |= FWRITE; 1701 1702 s = splbio(); 1703 bufq_drain(vnd->sc_tab); 1704 splx(s); 1705 1706 vnd->sc_flags |= VNF_VUNCONF; 1707 wakeup(&vnd->sc_tab); 1708 while (vnd->sc_flags & VNF_KTHREAD) 1709 tsleep(&vnd->sc_kthread, PRIBIO, "vnthr", 0); 1710 1711 #ifdef VND_COMPRESSION 1712 /* free the compressed file buffers */ 1713 if (vnd->sc_flags & VNF_COMP) { 1714 if (vnd->sc_comp_offsets) { 1715 free(vnd->sc_comp_offsets, M_DEVBUF); 1716 vnd->sc_comp_offsets = NULL; 1717 } 1718 if (vnd->sc_comp_buff) { 1719 free(vnd->sc_comp_buff, M_DEVBUF); 1720 vnd->sc_comp_buff = NULL; 1721 } 1722 if (vnd->sc_comp_decombuf) { 1723 free(vnd->sc_comp_decombuf, M_DEVBUF); 1724 vnd->sc_comp_decombuf = NULL; 1725 } 1726 } 1727 #endif /* VND_COMPRESSION */ 1728 vnd->sc_flags &= 1729 ~(VNF_INITED | VNF_READONLY | VNF_KLABEL | VNF_VLABEL 1730 | VNF_VUNCONF | VNF_COMP | VNF_CLEARING); 1731 if (vp == NULL) 1732 panic("vndclear: null vp"); 1733 (void) vn_close(vp, fflags, vnd->sc_cred); 1734 kauth_cred_free(vnd->sc_cred); 1735 vnd->sc_vp = NULL; 1736 vnd->sc_cred = NULL; 1737 vnd->sc_size = 0; 1738 } 1739 1740 static int 1741 vndsize(dev_t dev) 1742 { 1743 struct vnd_softc *sc; 1744 struct disklabel *lp; 1745 int part, unit, omask; 1746 int size; 1747 1748 unit = vndunit(dev); 1749 sc = device_lookup_private(&vnd_cd, unit); 1750 if (sc == NULL) 1751 return -1; 1752 1753 if ((sc->sc_flags & VNF_INITED) == 0) 1754 return -1; 1755 1756 part = DISKPART(dev); 1757 omask = sc->sc_dkdev.dk_openmask & (1 << part); 1758 lp = sc->sc_dkdev.dk_label; 1759 1760 if (omask == 0 && vndopen(dev, 0, S_IFBLK, curlwp)) /* XXX */ 1761 return -1; 1762 1763 if (lp->d_partitions[part].p_fstype != FS_SWAP) 1764 size = -1; 1765 else 1766 size = lp->d_partitions[part].p_size * 1767 (lp->d_secsize / DEV_BSIZE); 1768 1769 if (omask == 0 && vndclose(dev, 0, S_IFBLK, curlwp)) /* XXX */ 1770 return -1; 1771 1772 return size; 1773 } 1774 1775 static int 1776 vnddump(dev_t dev, daddr_t blkno, void *va, 1777 size_t size) 1778 { 1779 1780 /* Not implemented. */ 1781 return ENXIO; 1782 } 1783 1784 static void 1785 vndgetdefaultlabel(struct vnd_softc *sc, struct disklabel *lp) 1786 { 1787 struct vndgeom *vng = &sc->sc_geom; 1788 struct partition *pp; 1789 unsigned spb; 1790 1791 memset(lp, 0, sizeof(*lp)); 1792 1793 spb = vng->vng_secsize / DEV_BSIZE; 1794 if (sc->sc_size / spb > UINT32_MAX) 1795 lp->d_secperunit = UINT32_MAX; 1796 else 1797 lp->d_secperunit = sc->sc_size / spb; 1798 lp->d_secsize = vng->vng_secsize; 1799 lp->d_nsectors = vng->vng_nsectors; 1800 lp->d_ntracks = vng->vng_ntracks; 1801 lp->d_ncylinders = vng->vng_ncylinders; 1802 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 1803 1804 strncpy(lp->d_typename, "vnd", sizeof(lp->d_typename)); 1805 lp->d_type = DKTYPE_VND; 1806 strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname)); 1807 lp->d_rpm = 3600; 1808 lp->d_interleave = 1; 1809 lp->d_flags = 0; 1810 1811 pp = &lp->d_partitions[RAW_PART]; 1812 pp->p_offset = 0; 1813 pp->p_size = lp->d_secperunit; 1814 pp->p_fstype = FS_UNUSED; 1815 lp->d_npartitions = RAW_PART + 1; 1816 1817 lp->d_magic = DISKMAGIC; 1818 lp->d_magic2 = DISKMAGIC; 1819 lp->d_checksum = dkcksum(lp); 1820 } 1821 1822 /* 1823 * Read the disklabel from a vnd. If one is not present, create a fake one. 1824 */ 1825 static void 1826 vndgetdisklabel(dev_t dev, struct vnd_softc *sc) 1827 { 1828 const char *errstring; 1829 struct disklabel *lp = sc->sc_dkdev.dk_label; 1830 struct cpu_disklabel *clp = sc->sc_dkdev.dk_cpulabel; 1831 int i; 1832 1833 memset(clp, 0, sizeof(*clp)); 1834 1835 vndgetdefaultlabel(sc, lp); 1836 1837 /* 1838 * Call the generic disklabel extraction routine. 1839 */ 1840 errstring = readdisklabel(VNDLABELDEV(dev), vndstrategy, lp, clp); 1841 if (errstring) { 1842 /* 1843 * Lack of disklabel is common, but we print the warning 1844 * anyway, since it might contain other useful information. 1845 */ 1846 aprint_normal_dev(sc->sc_dev, "%s\n", errstring); 1847 1848 /* 1849 * For historical reasons, if there's no disklabel 1850 * present, all partitions must be FS_BSDFFS and 1851 * occupy the entire disk. 1852 */ 1853 for (i = 0; i < MAXPARTITIONS; i++) { 1854 /* 1855 * Don't wipe out port specific hack (such as 1856 * dos partition hack of i386 port). 1857 */ 1858 if (lp->d_partitions[i].p_size != 0) 1859 continue; 1860 1861 lp->d_partitions[i].p_size = lp->d_secperunit; 1862 lp->d_partitions[i].p_offset = 0; 1863 lp->d_partitions[i].p_fstype = FS_BSDFFS; 1864 } 1865 1866 strncpy(lp->d_packname, "default label", 1867 sizeof(lp->d_packname)); 1868 1869 lp->d_npartitions = MAXPARTITIONS; 1870 lp->d_checksum = dkcksum(lp); 1871 } 1872 } 1873 1874 /* 1875 * Wait interruptibly for an exclusive lock. 1876 * 1877 * XXX 1878 * Several drivers do this; it should be abstracted and made MP-safe. 1879 */ 1880 static int 1881 vndlock(struct vnd_softc *sc) 1882 { 1883 int error; 1884 1885 while ((sc->sc_flags & VNF_LOCKED) != 0) { 1886 sc->sc_flags |= VNF_WANTED; 1887 if ((error = tsleep(sc, PRIBIO | PCATCH, "vndlck", 0)) != 0) 1888 return error; 1889 } 1890 sc->sc_flags |= VNF_LOCKED; 1891 return 0; 1892 } 1893 1894 /* 1895 * Unlock and wake up any waiters. 1896 */ 1897 static void 1898 vndunlock(struct vnd_softc *sc) 1899 { 1900 1901 sc->sc_flags &= ~VNF_LOCKED; 1902 if ((sc->sc_flags & VNF_WANTED) != 0) { 1903 sc->sc_flags &= ~VNF_WANTED; 1904 wakeup(sc); 1905 } 1906 } 1907 1908 #ifdef VND_COMPRESSION 1909 /* compressed file read */ 1910 static void 1911 compstrategy(struct buf *bp, off_t bn) 1912 { 1913 int error; 1914 int unit = vndunit(bp->b_dev); 1915 struct vnd_softc *vnd = 1916 device_lookup_private(&vnd_cd, unit); 1917 u_int32_t comp_block; 1918 struct uio auio; 1919 char *addr; 1920 int s; 1921 1922 /* set up constants for data move */ 1923 auio.uio_rw = UIO_READ; 1924 UIO_SETUP_SYSSPACE(&auio); 1925 1926 /* read, and transfer the data */ 1927 addr = bp->b_data; 1928 bp->b_resid = bp->b_bcount; 1929 s = splbio(); 1930 while (bp->b_resid > 0) { 1931 unsigned length; 1932 size_t length_in_buffer; 1933 u_int32_t offset_in_buffer; 1934 struct iovec aiov; 1935 1936 /* calculate the compressed block number */ 1937 comp_block = bn / (off_t)vnd->sc_comp_blksz; 1938 1939 /* check for good block number */ 1940 if (comp_block >= vnd->sc_comp_numoffs) { 1941 bp->b_error = EINVAL; 1942 splx(s); 1943 return; 1944 } 1945 1946 /* read in the compressed block, if not in buffer */ 1947 if (comp_block != vnd->sc_comp_buffblk) { 1948 length = vnd->sc_comp_offsets[comp_block + 1] - 1949 vnd->sc_comp_offsets[comp_block]; 1950 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 1951 error = vn_rdwr(UIO_READ, vnd->sc_vp, vnd->sc_comp_buff, 1952 length, vnd->sc_comp_offsets[comp_block], 1953 UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, vnd->sc_cred, 1954 NULL, NULL); 1955 if (error) { 1956 bp->b_error = error; 1957 VOP_UNLOCK(vnd->sc_vp); 1958 splx(s); 1959 return; 1960 } 1961 /* uncompress the buffer */ 1962 vnd->sc_comp_stream.next_in = vnd->sc_comp_buff; 1963 vnd->sc_comp_stream.avail_in = length; 1964 vnd->sc_comp_stream.next_out = vnd->sc_comp_decombuf; 1965 vnd->sc_comp_stream.avail_out = vnd->sc_comp_blksz; 1966 inflateReset(&vnd->sc_comp_stream); 1967 error = inflate(&vnd->sc_comp_stream, Z_FINISH); 1968 if (error != Z_STREAM_END) { 1969 if (vnd->sc_comp_stream.msg) 1970 aprint_normal_dev(vnd->sc_dev, 1971 "compressed file, %s\n", 1972 vnd->sc_comp_stream.msg); 1973 bp->b_error = EBADMSG; 1974 VOP_UNLOCK(vnd->sc_vp); 1975 splx(s); 1976 return; 1977 } 1978 vnd->sc_comp_buffblk = comp_block; 1979 VOP_UNLOCK(vnd->sc_vp); 1980 } 1981 1982 /* transfer the usable uncompressed data */ 1983 offset_in_buffer = bn % (off_t)vnd->sc_comp_blksz; 1984 length_in_buffer = vnd->sc_comp_blksz - offset_in_buffer; 1985 if (length_in_buffer > bp->b_resid) 1986 length_in_buffer = bp->b_resid; 1987 auio.uio_iov = &aiov; 1988 auio.uio_iovcnt = 1; 1989 aiov.iov_base = addr; 1990 aiov.iov_len = length_in_buffer; 1991 auio.uio_resid = aiov.iov_len; 1992 auio.uio_offset = 0; 1993 error = uiomove(vnd->sc_comp_decombuf + offset_in_buffer, 1994 length_in_buffer, &auio); 1995 if (error) { 1996 bp->b_error = error; 1997 splx(s); 1998 return; 1999 } 2000 2001 bn += length_in_buffer; 2002 addr += length_in_buffer; 2003 bp->b_resid -= length_in_buffer; 2004 } 2005 splx(s); 2006 } 2007 2008 /* compression memory allocation routines */ 2009 static void * 2010 vnd_alloc(void *aux, u_int items, u_int siz) 2011 { 2012 return malloc(items * siz, M_TEMP, M_NOWAIT); 2013 } 2014 2015 static void 2016 vnd_free(void *aux, void *ptr) 2017 { 2018 free(ptr, M_TEMP); 2019 } 2020 #endif /* VND_COMPRESSION */ 2021 2022 static void 2023 vnd_set_geometry(struct vnd_softc *vnd) 2024 { 2025 struct disk_geom *dg = &vnd->sc_dkdev.dk_geom; 2026 2027 memset(dg, 0, sizeof(*dg)); 2028 2029 dg->dg_secperunit = (int64_t)vnd->sc_geom.vng_nsectors * 2030 vnd->sc_geom.vng_ntracks * vnd->sc_geom.vng_ncylinders; 2031 dg->dg_secsize = vnd->sc_geom.vng_secsize; 2032 dg->dg_nsectors = vnd->sc_geom.vng_nsectors; 2033 dg->dg_ntracks = vnd->sc_geom.vng_ntracks; 2034 dg->dg_ncylinders = vnd->sc_geom.vng_ncylinders; 2035 2036 #ifdef DEBUG 2037 if (vnddebug & VDB_LABEL) { 2038 printf("dg->dg_secperunit: %" PRId64 "\n", dg->dg_secperunit); 2039 printf("dg->dg_ncylinders: %u\n", dg->dg_ncylinders); 2040 } 2041 #endif 2042 disk_set_info(vnd->sc_dev, &vnd->sc_dkdev, NULL); 2043 } 2044 2045 #ifdef VND_COMPRESSION 2046 #define VND_DEPENDS "zlib" 2047 #else 2048 #define VND_DEPENDS NULL 2049 #endif 2050 2051 MODULE(MODULE_CLASS_DRIVER, vnd, VND_DEPENDS); 2052 2053 #ifdef _MODULE 2054 int vnd_bmajor = -1, vnd_cmajor = -1; 2055 2056 CFDRIVER_DECL(vnd, DV_DISK, NULL); 2057 #endif 2058 2059 static int 2060 vnd_modcmd(modcmd_t cmd, void *arg) 2061 { 2062 int error = 0; 2063 2064 switch (cmd) { 2065 case MODULE_CMD_INIT: 2066 #ifdef _MODULE 2067 error = config_cfdriver_attach(&vnd_cd); 2068 if (error) 2069 break; 2070 2071 error = config_cfattach_attach(vnd_cd.cd_name, &vnd_ca); 2072 if (error) { 2073 config_cfdriver_detach(&vnd_cd); 2074 aprint_error("%s: unable to register cfattach for \n" 2075 "%s, error %d", __func__, vnd_cd.cd_name, error); 2076 break; 2077 } 2078 2079 /* 2080 * Attach the {b,c}devsw's 2081 */ 2082 error = devsw_attach("vnd", &vnd_bdevsw, &vnd_bmajor, 2083 &vnd_cdevsw, &vnd_cmajor); 2084 /* 2085 * If devsw_attach fails, remove from autoconf database 2086 */ 2087 if (error) { 2088 config_cfattach_detach(vnd_cd.cd_name, &vnd_ca); 2089 config_cfdriver_detach(&vnd_cd); 2090 aprint_error("%s: unable to attach %s devsw, " 2091 "error %d", __func__, vnd_cd.cd_name, error); 2092 break; 2093 } 2094 #endif 2095 break; 2096 2097 case MODULE_CMD_FINI: 2098 #ifdef _MODULE 2099 /* 2100 * Remove {b,c}devsw's 2101 */ 2102 devsw_detach(&vnd_bdevsw, &vnd_cdevsw); 2103 2104 /* 2105 * Now remove device from autoconf database 2106 */ 2107 error = config_cfattach_detach(vnd_cd.cd_name, &vnd_ca); 2108 if (error) { 2109 error = devsw_attach("vnd", &vnd_bdevsw, &vnd_bmajor, 2110 &vnd_cdevsw, &vnd_cmajor); 2111 aprint_error("%s: failed to detach %s cfattach, " 2112 "error %d\n", __func__, vnd_cd.cd_name, error); 2113 break; 2114 } 2115 error = config_cfdriver_detach(&vnd_cd); 2116 if (error) { 2117 config_cfattach_attach(vnd_cd.cd_name, &vnd_ca); 2118 devsw_attach("vnd", &vnd_bdevsw, &vnd_bmajor, 2119 &vnd_cdevsw, &vnd_cmajor); 2120 aprint_error("%s: failed to detach %s cfdriver, " 2121 "error %d\n", __func__, vnd_cd.cd_name, error); 2122 break; 2123 } 2124 #endif 2125 break; 2126 2127 case MODULE_CMD_STAT: 2128 return ENOTTY; 2129 2130 default: 2131 return ENOTTY; 2132 } 2133 2134 return error; 2135 } 2136
Indexes created Mon Sep 29 21:09:56 GMT 2025