vnd.c revision 1.274
1 /* $NetBSD: vnd.c,v 1.274 2020/02/23 15:46:39 ad Exp $ */ 2 3 /*- 4 * Copyright (c) 1996, 1997, 1998, 2008, 2020 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 1.274 2020/02/23 15:46:39 ad 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/fstrans.h> 118 #include <sys/file.h> 119 #include <sys/uio.h> 120 #include <sys/conf.h> 121 #include <sys/kauth.h> 122 #include <sys/module.h> 123 #include <sys/compat_stub.h> 124 #include <sys/atomic.h> 125 126 #include <net/zlib.h> 127 128 #include <miscfs/genfs/genfs.h> 129 #include <miscfs/specfs/specdev.h> 130 131 #include <dev/dkvar.h> 132 #include <dev/vndvar.h> 133 134 #include "ioconf.h" 135 136 #if defined(VNDDEBUG) && !defined(DEBUG) 137 #define DEBUG 138 #endif 139 140 #ifdef DEBUG 141 int dovndcluster = 1; 142 #define VDB_FOLLOW 0x01 143 #define VDB_INIT 0x02 144 #define VDB_IO 0x04 145 #define VDB_LABEL 0x08 146 int vnddebug = 0; 147 #endif 148 149 #define vndunit(x) DISKUNIT(x) 150 151 struct vndxfer { 152 struct buf vx_buf; 153 struct vnd_softc *vx_vnd; 154 }; 155 #define VND_BUFTOXFER(bp) ((struct vndxfer *)(void *)bp) 156 157 #define VND_GETXFER(vnd) pool_get(&(vnd)->sc_vxpool, PR_WAITOK) 158 #define VND_PUTXFER(vnd, vx) pool_put(&(vnd)->sc_vxpool, (vx)) 159 160 #define VNDLABELDEV(dev) \ 161 (MAKEDISKDEV(major((dev)), vndunit((dev)), RAW_PART)) 162 163 #define VND_MAXPENDING(vnd) ((vnd)->sc_maxactive * 4) 164 #define VND_MAXPAGES(vnd) (1024 * 1024 / PAGE_SIZE) 165 166 167 static void vndclear(struct vnd_softc *, int); 168 static int vnddoclear(struct vnd_softc *, int, int, bool); 169 static int vndsetcred(struct vnd_softc *, kauth_cred_t); 170 static void vndthrottle(struct vnd_softc *, struct vnode *); 171 static void vndiodone(struct buf *); 172 #if 0 173 static void vndshutdown(void); 174 #endif 175 176 static void vndgetdefaultlabel(struct vnd_softc *, struct disklabel *); 177 static void vndgetdisklabel(dev_t, struct vnd_softc *); 178 179 static int vndlock(struct vnd_softc *); 180 static void vndunlock(struct vnd_softc *); 181 #ifdef VND_COMPRESSION 182 static void compstrategy(struct buf *, off_t); 183 static void *vnd_alloc(void *, u_int, u_int); 184 static void vnd_free(void *, void *); 185 #endif /* VND_COMPRESSION */ 186 187 static void vndthread(void *); 188 static bool vnode_has_op(const struct vnode *, int); 189 static void handle_with_rdwr(struct vnd_softc *, const struct buf *, 190 struct buf *); 191 static void handle_with_strategy(struct vnd_softc *, const struct buf *, 192 struct buf *); 193 static void vnd_set_geometry(struct vnd_softc *); 194 195 static dev_type_open(vndopen); 196 static dev_type_close(vndclose); 197 static dev_type_read(vndread); 198 static dev_type_write(vndwrite); 199 static dev_type_ioctl(vndioctl); 200 static dev_type_strategy(vndstrategy); 201 static dev_type_dump(vnddump); 202 static dev_type_size(vndsize); 203 204 const struct bdevsw vnd_bdevsw = { 205 .d_open = vndopen, 206 .d_close = vndclose, 207 .d_strategy = vndstrategy, 208 .d_ioctl = vndioctl, 209 .d_dump = vnddump, 210 .d_psize = vndsize, 211 .d_discard = nodiscard, 212 .d_flag = D_DISK 213 }; 214 215 const struct cdevsw vnd_cdevsw = { 216 .d_open = vndopen, 217 .d_close = vndclose, 218 .d_read = vndread, 219 .d_write = vndwrite, 220 .d_ioctl = vndioctl, 221 .d_stop = nostop, 222 .d_tty = notty, 223 .d_poll = nopoll, 224 .d_mmap = nommap, 225 .d_kqfilter = nokqfilter, 226 .d_discard = nodiscard, 227 .d_flag = D_DISK 228 }; 229 230 static int vnd_match(device_t, cfdata_t, void *); 231 static void vnd_attach(device_t, device_t, void *); 232 static int vnd_detach(device_t, int); 233 234 CFATTACH_DECL3_NEW(vnd, sizeof(struct vnd_softc), 235 vnd_match, vnd_attach, vnd_detach, NULL, NULL, NULL, DVF_DETACH_SHUTDOWN); 236 237 static struct vnd_softc *vnd_spawn(int); 238 int vnd_destroy(device_t); 239 240 static struct dkdriver vnddkdriver = { 241 .d_strategy = vndstrategy, 242 .d_minphys = minphys 243 }; 244 245 void 246 vndattach(int num) 247 { 248 int error; 249 250 error = config_cfattach_attach(vnd_cd.cd_name, &vnd_ca); 251 if (error) 252 aprint_error("%s: unable to register cfattach, error = %d\n", 253 vnd_cd.cd_name, error); 254 } 255 256 static int 257 vnd_match(device_t self, cfdata_t cfdata, void *aux) 258 { 259 260 return 1; 261 } 262 263 static void 264 vnd_attach(device_t parent, device_t self, void *aux) 265 { 266 struct vnd_softc *sc = device_private(self); 267 268 sc->sc_dev = self; 269 sc->sc_comp_offsets = NULL; 270 sc->sc_comp_buff = NULL; 271 sc->sc_comp_decombuf = NULL; 272 bufq_alloc(&sc->sc_tab, "disksort", BUFQ_SORT_RAWBLOCK); 273 disk_init(&sc->sc_dkdev, device_xname(self), &vnddkdriver); 274 if (!pmf_device_register(self, NULL, NULL)) 275 aprint_error_dev(self, "couldn't establish power handler\n"); 276 } 277 278 static int 279 vnd_detach(device_t self, int flags) 280 { 281 int error; 282 struct vnd_softc *sc = device_private(self); 283 284 if (sc->sc_flags & VNF_INITED) { 285 error = vnddoclear(sc, 0, -1, (flags & DETACH_FORCE) != 0); 286 if (error != 0) 287 return error; 288 } 289 290 pmf_device_deregister(self); 291 bufq_free(sc->sc_tab); 292 disk_destroy(&sc->sc_dkdev); 293 294 return 0; 295 } 296 297 static struct vnd_softc * 298 vnd_spawn(int unit) 299 { 300 cfdata_t cf; 301 302 cf = malloc(sizeof(*cf), M_DEVBUF, M_WAITOK); 303 cf->cf_name = vnd_cd.cd_name; 304 cf->cf_atname = vnd_cd.cd_name; 305 cf->cf_unit = unit; 306 cf->cf_fstate = FSTATE_STAR; 307 308 return device_private(config_attach_pseudo(cf)); 309 } 310 311 int 312 vnd_destroy(device_t dev) 313 { 314 int error; 315 cfdata_t cf; 316 317 cf = device_cfdata(dev); 318 error = config_detach(dev, DETACH_QUIET); 319 if (error) 320 return error; 321 free(cf, M_DEVBUF); 322 return 0; 323 } 324 325 static int 326 vndopen(dev_t dev, int flags, int mode, struct lwp *l) 327 { 328 int unit = vndunit(dev); 329 struct vnd_softc *sc; 330 int error = 0, part, pmask; 331 struct disklabel *lp; 332 333 #ifdef DEBUG 334 if (vnddebug & VDB_FOLLOW) 335 printf("vndopen(0x%"PRIx64", 0x%x, 0x%x, %p)\n", dev, flags, mode, l); 336 #endif 337 sc = device_lookup_private(&vnd_cd, unit); 338 if (sc == NULL) { 339 sc = vnd_spawn(unit); 340 if (sc == NULL) 341 return ENOMEM; 342 343 /* compatibility, keep disklabel after close */ 344 sc->sc_flags = VNF_KLABEL; 345 } 346 347 if ((error = vndlock(sc)) != 0) 348 return error; 349 350 mutex_enter(&sc->sc_dkdev.dk_openlock); 351 352 if ((sc->sc_flags & VNF_CLEARING) != 0) { 353 error = ENXIO; 354 goto done; 355 } 356 357 lp = sc->sc_dkdev.dk_label; 358 359 part = DISKPART(dev); 360 pmask = (1 << part); 361 362 if (sc->sc_dkdev.dk_nwedges != 0 && part != RAW_PART) { 363 error = EBUSY; 364 goto done; 365 } 366 367 if (sc->sc_flags & VNF_INITED) { 368 if ((sc->sc_dkdev.dk_openmask & ~(1<<RAW_PART)) != 0) { 369 /* 370 * If any non-raw partition is open, but the disk 371 * has been invalidated, disallow further opens. 372 */ 373 if ((sc->sc_flags & VNF_VLABEL) == 0) { 374 error = EIO; 375 goto done; 376 } 377 } else { 378 /* 379 * Load the partition info if not already loaded. 380 */ 381 if ((sc->sc_flags & VNF_VLABEL) == 0) { 382 sc->sc_flags |= VNF_VLABEL; 383 vndgetdisklabel(dev, sc); 384 } 385 } 386 } 387 388 /* Check that the partitions exists. */ 389 if (part != RAW_PART) { 390 if (((sc->sc_flags & VNF_INITED) == 0) || 391 ((part >= lp->d_npartitions) || 392 (lp->d_partitions[part].p_fstype == FS_UNUSED))) { 393 error = ENXIO; 394 goto done; 395 } 396 } 397 398 /* Prevent our unit from being unconfigured while open. */ 399 switch (mode) { 400 case S_IFCHR: 401 sc->sc_dkdev.dk_copenmask |= pmask; 402 break; 403 404 case S_IFBLK: 405 sc->sc_dkdev.dk_bopenmask |= pmask; 406 break; 407 } 408 sc->sc_dkdev.dk_openmask = 409 sc->sc_dkdev.dk_copenmask | sc->sc_dkdev.dk_bopenmask; 410 411 done: 412 mutex_exit(&sc->sc_dkdev.dk_openlock); 413 vndunlock(sc); 414 return error; 415 } 416 417 static int 418 vndclose(dev_t dev, int flags, int mode, struct lwp *l) 419 { 420 int unit = vndunit(dev); 421 struct vnd_softc *sc; 422 int error = 0, part; 423 424 #ifdef DEBUG 425 if (vnddebug & VDB_FOLLOW) 426 printf("vndclose(0x%"PRIx64", 0x%x, 0x%x, %p)\n", dev, flags, mode, l); 427 #endif 428 sc = device_lookup_private(&vnd_cd, unit); 429 if (sc == NULL) 430 return ENXIO; 431 432 if ((error = vndlock(sc)) != 0) 433 return error; 434 435 mutex_enter(&sc->sc_dkdev.dk_openlock); 436 437 part = DISKPART(dev); 438 439 /* ...that much closer to allowing unconfiguration... */ 440 switch (mode) { 441 case S_IFCHR: 442 sc->sc_dkdev.dk_copenmask &= ~(1 << part); 443 break; 444 445 case S_IFBLK: 446 sc->sc_dkdev.dk_bopenmask &= ~(1 << part); 447 break; 448 } 449 sc->sc_dkdev.dk_openmask = 450 sc->sc_dkdev.dk_copenmask | sc->sc_dkdev.dk_bopenmask; 451 452 /* are we last opener ? */ 453 if (sc->sc_dkdev.dk_openmask == 0) { 454 if ((sc->sc_flags & VNF_KLABEL) == 0) 455 sc->sc_flags &= ~VNF_VLABEL; 456 } 457 458 mutex_exit(&sc->sc_dkdev.dk_openlock); 459 460 vndunlock(sc); 461 462 if ((sc->sc_flags & VNF_INITED) == 0) { 463 if ((error = vnd_destroy(sc->sc_dev)) != 0) { 464 aprint_error_dev(sc->sc_dev, 465 "unable to detach instance\n"); 466 return error; 467 } 468 } 469 470 return 0; 471 } 472 473 /* 474 * Queue the request, and wakeup the kernel thread to handle it. 475 */ 476 static void 477 vndstrategy(struct buf *bp) 478 { 479 int unit = vndunit(bp->b_dev); 480 struct vnd_softc *vnd = 481 device_lookup_private(&vnd_cd, unit); 482 struct disklabel *lp; 483 daddr_t blkno; 484 int s = splbio(); 485 486 if (vnd == NULL) { 487 bp->b_error = ENXIO; 488 goto done; 489 } 490 lp = vnd->sc_dkdev.dk_label; 491 492 if ((vnd->sc_flags & VNF_INITED) == 0) { 493 bp->b_error = ENXIO; 494 goto done; 495 } 496 497 /* 498 * The transfer must be a whole number of blocks. 499 */ 500 if ((bp->b_bcount % lp->d_secsize) != 0) { 501 bp->b_error = EINVAL; 502 goto done; 503 } 504 505 /* 506 * check if we're read-only. 507 */ 508 if ((vnd->sc_flags & VNF_READONLY) && !(bp->b_flags & B_READ)) { 509 bp->b_error = EACCES; 510 goto done; 511 } 512 513 /* If it's a nil transfer, wake up the top half now. */ 514 if (bp->b_bcount == 0) { 515 goto done; 516 } 517 518 /* 519 * Do bounds checking and adjust transfer. If there's an error, 520 * the bounds check will flag that for us. 521 */ 522 if (DISKPART(bp->b_dev) == RAW_PART) { 523 if (bounds_check_with_mediasize(bp, DEV_BSIZE, 524 vnd->sc_size) <= 0) 525 goto done; 526 } else { 527 if (bounds_check_with_label(&vnd->sc_dkdev, 528 bp, vnd->sc_flags & (VNF_WLABEL|VNF_LABELLING)) <= 0) 529 goto done; 530 } 531 532 /* 533 * Put the block number in terms of the logical blocksize 534 * of the "device". 535 */ 536 537 blkno = bp->b_blkno / (lp->d_secsize / DEV_BSIZE); 538 539 /* 540 * Translate the partition-relative block number to an absolute. 541 */ 542 if (DISKPART(bp->b_dev) != RAW_PART) { 543 struct partition *pp; 544 545 pp = &vnd->sc_dkdev.dk_label->d_partitions[ 546 DISKPART(bp->b_dev)]; 547 blkno += pp->p_offset; 548 } 549 bp->b_rawblkno = blkno; 550 551 #ifdef DEBUG 552 if (vnddebug & VDB_FOLLOW) 553 printf("vndstrategy(%p): unit %d\n", bp, unit); 554 #endif 555 if ((vnd->sc_flags & VNF_USE_VN_RDWR)) { 556 KASSERT(vnd->sc_pending >= 0 && 557 vnd->sc_pending <= VND_MAXPENDING(vnd)); 558 while (vnd->sc_pending == VND_MAXPENDING(vnd)) 559 tsleep(&vnd->sc_pending, PRIBIO, "vndpc", 0); 560 vnd->sc_pending++; 561 } 562 bufq_put(vnd->sc_tab, bp); 563 wakeup(&vnd->sc_tab); 564 splx(s); 565 return; 566 567 done: 568 bp->b_resid = bp->b_bcount; 569 biodone(bp); 570 splx(s); 571 } 572 573 static bool 574 vnode_has_strategy(struct vnd_softc *vnd) 575 { 576 return vnode_has_op(vnd->sc_vp, VOFFSET(vop_bmap)) && 577 vnode_has_op(vnd->sc_vp, VOFFSET(vop_strategy)); 578 } 579 580 /* Verify that I/O requests cannot be smaller than the 581 * smallest I/O size supported by the backend. 582 */ 583 static bool 584 vnode_has_large_blocks(struct vnd_softc *vnd) 585 { 586 u_int32_t vnd_secsize, iosize; 587 588 iosize = vnd->sc_iosize; 589 vnd_secsize = vnd->sc_geom.vng_secsize; 590 591 return vnd_secsize % iosize != 0; 592 } 593 594 /* XXX this function needs a reliable check to detect 595 * sparse files. Otherwise, bmap/strategy may be used 596 * and fail on non-allocated blocks. VOP_READ/VOP_WRITE 597 * works on sparse files. 598 */ 599 #if notyet 600 static bool 601 vnode_strategy_probe(struct vnd_softc *vnd) 602 { 603 int error; 604 daddr_t nbn; 605 606 if (!vnode_has_strategy(vnd)) 607 return false; 608 609 if (vnode_has_large_blocks(vnd)) 610 return false; 611 612 /* Convert the first logical block number to its 613 * physical block number. 614 */ 615 error = 0; 616 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 617 error = VOP_BMAP(vnd->sc_vp, 0, NULL, &nbn, NULL); 618 VOP_UNLOCK(vnd->sc_vp); 619 620 /* Test if that worked. */ 621 if (error == 0 && (long)nbn == -1) 622 return false; 623 624 return true; 625 } 626 #endif 627 628 static void 629 vndthread(void *arg) 630 { 631 struct vnd_softc *vnd = arg; 632 int s; 633 634 /* Determine whether we can *use* VOP_BMAP and VOP_STRATEGY to 635 * directly access the backing vnode. If we can, use these two 636 * operations to avoid messing with the local buffer cache. 637 * Otherwise fall back to regular VOP_READ/VOP_WRITE operations 638 * which are guaranteed to work with any file system. */ 639 if ((vnd->sc_flags & VNF_USE_VN_RDWR) == 0 && 640 ! vnode_has_strategy(vnd)) 641 vnd->sc_flags |= VNF_USE_VN_RDWR; 642 643 /* VOP_STRATEGY can only be used if the backing vnode allows 644 * to access blocks as small as defined by the vnd geometry. 645 */ 646 if ((vnd->sc_flags & VNF_USE_VN_RDWR) == 0 && 647 vnode_has_large_blocks(vnd)) 648 vnd->sc_flags |= VNF_USE_VN_RDWR; 649 650 #ifdef DEBUG 651 if (vnddebug & VDB_INIT) 652 printf("vndthread: vp %p, %s\n", vnd->sc_vp, 653 (vnd->sc_flags & VNF_USE_VN_RDWR) == 0 ? 654 "using bmap/strategy operations" : 655 "using read/write operations"); 656 #endif 657 658 s = splbio(); 659 vnd->sc_flags |= VNF_KTHREAD; 660 wakeup(&vnd->sc_kthread); 661 662 /* 663 * Dequeue requests and serve them depending on the available 664 * vnode operations. 665 */ 666 while ((vnd->sc_flags & VNF_VUNCONF) == 0) { 667 struct vndxfer *vnx; 668 struct buf *obp; 669 struct buf *bp; 670 671 obp = bufq_get(vnd->sc_tab); 672 if (obp == NULL) { 673 tsleep(&vnd->sc_tab, PRIBIO, "vndbp", 0); 674 continue; 675 }; 676 if ((vnd->sc_flags & VNF_USE_VN_RDWR)) { 677 KASSERT(vnd->sc_pending > 0 && 678 vnd->sc_pending <= VND_MAXPENDING(vnd)); 679 if (vnd->sc_pending-- == VND_MAXPENDING(vnd)) 680 wakeup(&vnd->sc_pending); 681 } 682 splx(s); 683 #ifdef DEBUG 684 if (vnddebug & VDB_FOLLOW) 685 printf("vndthread(%p)\n", obp); 686 #endif 687 688 if (vnd->sc_vp->v_mount == NULL) { 689 obp->b_error = ENXIO; 690 goto done; 691 } 692 #ifdef VND_COMPRESSION 693 /* handle a compressed read */ 694 if ((obp->b_flags & B_READ) != 0 && (vnd->sc_flags & VNF_COMP)) { 695 off_t bn; 696 697 /* Convert to a byte offset within the file. */ 698 bn = obp->b_rawblkno * 699 vnd->sc_dkdev.dk_label->d_secsize; 700 701 compstrategy(obp, bn); 702 goto done; 703 } 704 #endif /* VND_COMPRESSION */ 705 706 /* 707 * Allocate a header for this transfer and link it to the 708 * buffer 709 */ 710 s = splbio(); 711 vnx = VND_GETXFER(vnd); 712 splx(s); 713 vnx->vx_vnd = vnd; 714 715 s = splbio(); 716 while (vnd->sc_active >= vnd->sc_maxactive) { 717 tsleep(&vnd->sc_tab, PRIBIO, "vndac", 0); 718 } 719 vnd->sc_active++; 720 splx(s); 721 722 /* Instrumentation. */ 723 disk_busy(&vnd->sc_dkdev); 724 725 bp = &vnx->vx_buf; 726 buf_init(bp); 727 bp->b_flags = (obp->b_flags & B_READ); 728 bp->b_oflags = obp->b_oflags; 729 bp->b_cflags = obp->b_cflags; 730 bp->b_iodone = vndiodone; 731 bp->b_private = obp; 732 bp->b_vp = vnd->sc_vp; 733 bp->b_objlock = bp->b_vp->v_interlock; 734 bp->b_data = obp->b_data; 735 bp->b_bcount = obp->b_bcount; 736 BIO_COPYPRIO(bp, obp); 737 738 /* Make sure the request succeeds while suspending this fs. */ 739 fstrans_start_lazy(vnd->sc_vp->v_mount); 740 741 /* Handle the request using the appropriate operations. */ 742 if ((vnd->sc_flags & VNF_USE_VN_RDWR) == 0) 743 handle_with_strategy(vnd, obp, bp); 744 else 745 handle_with_rdwr(vnd, obp, bp); 746 747 fstrans_done(vnd->sc_vp->v_mount); 748 749 s = splbio(); 750 continue; 751 752 done: 753 biodone(obp); 754 s = splbio(); 755 } 756 757 vnd->sc_flags &= (~VNF_KTHREAD | VNF_VUNCONF); 758 wakeup(&vnd->sc_kthread); 759 splx(s); 760 kthread_exit(0); 761 } 762 763 /* 764 * Checks if the given vnode supports the requested operation. 765 * The operation is specified the offset returned by VOFFSET. 766 * 767 * XXX The test below used to determine this is quite fragile 768 * because it relies on the file system to use genfs to specify 769 * unimplemented operations. There might be another way to do 770 * it more cleanly. 771 */ 772 static bool 773 vnode_has_op(const struct vnode *vp, int opoffset) 774 { 775 int (*defaultp)(void *); 776 int (*opp)(void *); 777 778 defaultp = vp->v_op[VOFFSET(vop_default)]; 779 opp = vp->v_op[opoffset]; 780 781 return opp != defaultp && opp != genfs_eopnotsupp && 782 opp != genfs_badop && opp != genfs_nullop; 783 } 784 785 /* 786 * Handles the read/write request given in 'bp' using the vnode's VOP_READ 787 * and VOP_WRITE operations. 788 * 789 * 'obp' is a pointer to the original request fed to the vnd device. 790 */ 791 static void 792 handle_with_rdwr(struct vnd_softc *vnd, const struct buf *obp, struct buf *bp) 793 { 794 bool doread; 795 off_t offset; 796 size_t len, resid; 797 struct vnode *vp; 798 int npages; 799 800 doread = bp->b_flags & B_READ; 801 offset = obp->b_rawblkno * vnd->sc_dkdev.dk_label->d_secsize; 802 len = bp->b_bcount; 803 vp = vnd->sc_vp; 804 805 #if defined(DEBUG) 806 if (vnddebug & VDB_IO) 807 printf("vnd (rdwr): vp %p, %s, rawblkno 0x%" PRIx64 808 ", secsize %d, offset %" PRIu64 809 ", bcount %d\n", 810 vp, doread ? "read" : "write", obp->b_rawblkno, 811 vnd->sc_dkdev.dk_label->d_secsize, offset, 812 bp->b_bcount); 813 #endif 814 815 /* Issue the read or write operation. */ 816 bp->b_error = 817 vn_rdwr(doread ? UIO_READ : UIO_WRITE, 818 vp, bp->b_data, len, offset, UIO_SYSSPACE, 819 IO_ADV_ENCODE(POSIX_FADV_NOREUSE) | IO_DIRECT, 820 vnd->sc_cred, &resid, NULL); 821 bp->b_resid = resid; 822 823 /* 824 * Avoid caching too many pages, the vnd user 825 * is usually a filesystem and caches itself. 826 * We need some amount of caching to not hinder 827 * read-ahead and write-behind operations. 828 */ 829 npages = atomic_load_relaxed(&vp->v_uobj.uo_npages); 830 if (npages > VND_MAXPAGES(vnd)) { 831 rw_enter(vp->v_uobj.vmobjlock, RW_WRITER); 832 (void) VOP_PUTPAGES(vp, 0, 0, 833 PGO_ALLPAGES | PGO_CLEANIT | PGO_FREE); 834 } 835 836 /* We need to increase the number of outputs on the vnode if 837 * there was any write to it. */ 838 if (!doread) { 839 mutex_enter(vp->v_interlock); 840 vp->v_numoutput++; 841 mutex_exit(vp->v_interlock); 842 } 843 844 biodone(bp); 845 } 846 847 /* 848 * Handes the read/write request given in 'bp' using the vnode's VOP_BMAP 849 * and VOP_STRATEGY operations. 850 * 851 * 'obp' is a pointer to the original request fed to the vnd device. 852 */ 853 static void 854 handle_with_strategy(struct vnd_softc *vnd, const struct buf *obp, 855 struct buf *bp) 856 { 857 int bsize, error, flags, skipped; 858 size_t resid, sz; 859 off_t bn, offset; 860 struct vnode *vp; 861 struct buf *nbp = NULL; 862 863 flags = obp->b_flags; 864 865 866 /* convert to a byte offset within the file. */ 867 bn = obp->b_rawblkno * vnd->sc_dkdev.dk_label->d_secsize; 868 869 bsize = vnd->sc_vp->v_mount->mnt_stat.f_iosize; 870 skipped = 0; 871 872 /* 873 * Break the request into bsize pieces and feed them 874 * sequentially using VOP_BMAP/VOP_STRATEGY. 875 * We do it this way to keep from flooding NFS servers if we 876 * are connected to an NFS file. This places the burden on 877 * the client rather than the server. 878 */ 879 error = 0; 880 bp->b_resid = bp->b_bcount; 881 for (offset = 0, resid = bp->b_resid; /* true */; 882 resid -= sz, offset += sz) { 883 daddr_t nbn; 884 int off, nra; 885 886 nra = 0; 887 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 888 error = VOP_BMAP(vnd->sc_vp, bn / bsize, &vp, &nbn, &nra); 889 VOP_UNLOCK(vnd->sc_vp); 890 891 if (error == 0 && (long)nbn == -1) 892 error = EIO; 893 894 /* 895 * If there was an error or a hole in the file...punt. 896 * Note that we may have to wait for any operations 897 * that we have already fired off before releasing 898 * the buffer. 899 * 900 * XXX we could deal with holes here but it would be 901 * a hassle (in the write case). 902 */ 903 if (error) { 904 skipped += resid; 905 break; 906 } 907 908 #ifdef DEBUG 909 if (!dovndcluster) 910 nra = 0; 911 #endif 912 913 off = bn % bsize; 914 sz = MIN(((off_t)1 + nra) * bsize - off, resid); 915 #ifdef DEBUG 916 if (vnddebug & VDB_IO) 917 printf("vndstrategy: vp %p/%p bn 0x%qx/0x%" PRIx64 918 " sz 0x%zx\n", vnd->sc_vp, vp, (long long)bn, 919 nbn, sz); 920 #endif 921 922 nbp = getiobuf(vp, true); 923 nestiobuf_setup(bp, nbp, offset, sz); 924 nbp->b_blkno = nbn + btodb(off); 925 926 #if 0 /* XXX #ifdef DEBUG */ 927 if (vnddebug & VDB_IO) 928 printf("vndstart(%ld): bp %p vp %p blkno " 929 "0x%" PRIx64 " flags %x addr %p cnt 0x%x\n", 930 (long) (vnd-vnd_softc), &nbp->vb_buf, 931 nbp->vb_buf.b_vp, nbp->vb_buf.b_blkno, 932 nbp->vb_buf.b_flags, nbp->vb_buf.b_data, 933 nbp->vb_buf.b_bcount); 934 #endif 935 if (resid == sz) { 936 break; 937 } 938 VOP_STRATEGY(vp, nbp); 939 bn += sz; 940 } 941 if (!(flags & B_READ)) { 942 struct vnode *w_vp; 943 /* 944 * this is the last nested buf, account for 945 * the parent buf write too. 946 * This has to be done last, so that 947 * fsync won't wait for this write which 948 * has no chance to complete before all nested bufs 949 * have been queued. But it has to be done 950 * before the last VOP_STRATEGY() 951 * or the call to nestiobuf_done(). 952 */ 953 w_vp = bp->b_vp; 954 mutex_enter(w_vp->v_interlock); 955 w_vp->v_numoutput++; 956 mutex_exit(w_vp->v_interlock); 957 } 958 KASSERT(skipped != 0 || nbp != NULL); 959 if (skipped) 960 nestiobuf_done(bp, skipped, error); 961 else 962 VOP_STRATEGY(vp, nbp); 963 } 964 965 static void 966 vndiodone(struct buf *bp) 967 { 968 struct vndxfer *vnx = VND_BUFTOXFER(bp); 969 struct vnd_softc *vnd = vnx->vx_vnd; 970 struct buf *obp = bp->b_private; 971 int s = splbio(); 972 973 KERNEL_LOCK(1, NULL); /* XXXSMP */ 974 KASSERT(&vnx->vx_buf == bp); 975 KASSERT(vnd->sc_active > 0); 976 #ifdef DEBUG 977 if (vnddebug & VDB_IO) { 978 printf("vndiodone1: bp %p iodone: error %d\n", 979 bp, bp->b_error); 980 } 981 #endif 982 disk_unbusy(&vnd->sc_dkdev, bp->b_bcount - bp->b_resid, 983 (bp->b_flags & B_READ)); 984 vnd->sc_active--; 985 if (vnd->sc_active == 0) { 986 wakeup(&vnd->sc_tab); 987 } 988 KERNEL_UNLOCK_ONE(NULL); /* XXXSMP */ 989 splx(s); 990 obp->b_error = bp->b_error; 991 obp->b_resid = bp->b_resid; 992 buf_destroy(bp); 993 VND_PUTXFER(vnd, vnx); 994 biodone(obp); 995 } 996 997 /* ARGSUSED */ 998 static int 999 vndread(dev_t dev, struct uio *uio, int flags) 1000 { 1001 int unit = vndunit(dev); 1002 struct vnd_softc *sc; 1003 1004 #ifdef DEBUG 1005 if (vnddebug & VDB_FOLLOW) 1006 printf("vndread(0x%"PRIx64", %p)\n", dev, uio); 1007 #endif 1008 1009 sc = device_lookup_private(&vnd_cd, unit); 1010 if (sc == NULL) 1011 return ENXIO; 1012 1013 if ((sc->sc_flags & VNF_INITED) == 0) 1014 return ENXIO; 1015 1016 return physio(vndstrategy, NULL, dev, B_READ, minphys, uio); 1017 } 1018 1019 /* ARGSUSED */ 1020 static int 1021 vndwrite(dev_t dev, struct uio *uio, int flags) 1022 { 1023 int unit = vndunit(dev); 1024 struct vnd_softc *sc; 1025 1026 #ifdef DEBUG 1027 if (vnddebug & VDB_FOLLOW) 1028 printf("vndwrite(0x%"PRIx64", %p)\n", dev, uio); 1029 #endif 1030 1031 sc = device_lookup_private(&vnd_cd, unit); 1032 if (sc == NULL) 1033 return ENXIO; 1034 1035 if ((sc->sc_flags & VNF_INITED) == 0) 1036 return ENXIO; 1037 1038 return physio(vndstrategy, NULL, dev, B_WRITE, minphys, uio); 1039 } 1040 1041 static int 1042 vnd_cget(struct lwp *l, int unit, int *un, struct vattr *va) 1043 { 1044 int error; 1045 struct vnd_softc *vnd; 1046 1047 if (*un == -1) 1048 *un = unit; 1049 if (*un < 0) 1050 return EINVAL; 1051 1052 vnd = device_lookup_private(&vnd_cd, *un); 1053 if (vnd == NULL) 1054 return -1; 1055 1056 if ((vnd->sc_flags & VNF_INITED) == 0) 1057 return -1; 1058 1059 vn_lock(vnd->sc_vp, LK_SHARED | LK_RETRY); 1060 error = VOP_GETATTR(vnd->sc_vp, va, l->l_cred); 1061 VOP_UNLOCK(vnd->sc_vp); 1062 return error; 1063 } 1064 1065 static int 1066 vnddoclear(struct vnd_softc *vnd, int pmask, int minor, bool force) 1067 { 1068 int error; 1069 1070 if ((error = vndlock(vnd)) != 0) 1071 return error; 1072 1073 /* 1074 * Don't unconfigure if any other partitions are open 1075 * or if both the character and block flavors of this 1076 * partition are open. 1077 */ 1078 if (DK_BUSY(vnd, pmask) && !force) { 1079 vndunlock(vnd); 1080 return EBUSY; 1081 } 1082 1083 /* Delete all of our wedges */ 1084 dkwedge_delall(&vnd->sc_dkdev); 1085 1086 /* 1087 * XXX vndclear() might call vndclose() implicitly; 1088 * release lock to avoid recursion 1089 * 1090 * Set VNF_CLEARING to prevent vndopen() from 1091 * sneaking in after we vndunlock(). 1092 */ 1093 vnd->sc_flags |= VNF_CLEARING; 1094 vndunlock(vnd); 1095 vndclear(vnd, minor); 1096 #ifdef DEBUG 1097 if (vnddebug & VDB_INIT) 1098 printf("%s: CLRed\n", __func__); 1099 #endif 1100 1101 /* Destroy the xfer and buffer pools. */ 1102 pool_destroy(&vnd->sc_vxpool); 1103 1104 /* Detach the disk. */ 1105 disk_detach(&vnd->sc_dkdev); 1106 1107 return 0; 1108 } 1109 1110 static int 1111 vndioctl_get(struct lwp *l, void *data, int unit, struct vattr *va) 1112 { 1113 int error; 1114 1115 KASSERT(l); 1116 1117 /* the first member is always int vnd_unit in all the versions */ 1118 if (*(int *)data >= vnd_cd.cd_ndevs) 1119 return ENXIO; 1120 1121 switch (error = vnd_cget(l, unit, (int *)data, va)) { 1122 case -1: 1123 /* unused is not an error */ 1124 memset(va, 0, sizeof(*va)); 1125 /*FALLTHROUGH*/ 1126 case 0: 1127 return 0; 1128 default: 1129 return error; 1130 } 1131 } 1132 1133 /* ARGSUSED */ 1134 static int 1135 vndioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 1136 { 1137 bool force; 1138 int unit = vndunit(dev); 1139 struct vnd_softc *vnd; 1140 struct vnd_ioctl *vio; 1141 struct vattr vattr; 1142 struct pathbuf *pb; 1143 struct nameidata nd; 1144 int error, part, pmask; 1145 uint64_t geomsize; 1146 int fflags; 1147 #ifdef __HAVE_OLD_DISKLABEL 1148 struct disklabel newlabel; 1149 #endif 1150 1151 #ifdef DEBUG 1152 if (vnddebug & VDB_FOLLOW) 1153 printf("vndioctl(0x%"PRIx64", 0x%lx, %p, 0x%x, %p): unit %d\n", 1154 dev, cmd, data, flag, l->l_proc, unit); 1155 #endif 1156 /* Do the get's first; they don't need initialization or verification */ 1157 switch (cmd) { 1158 case VNDIOCGET: 1159 if ((error = vndioctl_get(l, data, unit, &vattr)) != 0) 1160 return error; 1161 1162 struct vnd_user *vnu = data; 1163 vnu->vnu_dev = vattr.va_fsid; 1164 vnu->vnu_ino = vattr.va_fileid; 1165 return 0; 1166 1167 default: 1168 /* First check for COMPAT_50 hook */ 1169 MODULE_HOOK_CALL(compat_vndioctl_50_hook, 1170 (cmd, l, data, unit, &vattr, vndioctl_get), 1171 enosys(), error); 1172 1173 /* 1174 * If not present, then COMPAT_30 hook also not 1175 * present, so just continue with checks for the 1176 * "write" commands 1177 */ 1178 if (error == ENOSYS) { 1179 error = 0; 1180 break; 1181 } 1182 1183 /* If not already handled, try the COMPAT_30 hook */ 1184 if (error == EPASSTHROUGH) 1185 MODULE_HOOK_CALL(compat_vndioctl_30_hook, 1186 (cmd, l, data, unit, &vattr, vndioctl_get), 1187 enosys(), error); 1188 1189 /* If no COMPAT_30 module, or not handled, check writes */ 1190 if (error == ENOSYS || error == EPASSTHROUGH) { 1191 error = 0; 1192 break; 1193 } 1194 return error; 1195 } 1196 1197 vnd = device_lookup_private(&vnd_cd, unit); 1198 if (vnd == NULL) 1199 return ENXIO; 1200 vio = (struct vnd_ioctl *)data; 1201 1202 /* Must be open for writes for these commands... */ 1203 switch (cmd) { 1204 case VNDIOCSET50: 1205 case VNDIOCCLR50: 1206 if (!compat_vndioctl_50_hook.hooked) 1207 return EINVAL; 1208 /* FALLTHROUGH */ 1209 case VNDIOCSET: 1210 case VNDIOCCLR: 1211 case DIOCSDINFO: 1212 case DIOCWDINFO: 1213 #ifdef __HAVE_OLD_DISKLABEL 1214 case ODIOCSDINFO: 1215 case ODIOCWDINFO: 1216 #endif 1217 case DIOCKLABEL: 1218 case DIOCWLABEL: 1219 if ((flag & FWRITE) == 0) 1220 return EBADF; 1221 } 1222 1223 /* Must be initialized for these... */ 1224 switch (cmd) { 1225 case VNDIOCCLR: 1226 case VNDIOCCLR50: 1227 case DIOCGDINFO: 1228 case DIOCSDINFO: 1229 case DIOCWDINFO: 1230 case DIOCGPARTINFO: 1231 case DIOCKLABEL: 1232 case DIOCWLABEL: 1233 case DIOCGDEFLABEL: 1234 case DIOCCACHESYNC: 1235 #ifdef __HAVE_OLD_DISKLABEL 1236 case ODIOCGDINFO: 1237 case ODIOCSDINFO: 1238 case ODIOCWDINFO: 1239 case ODIOCGDEFLABEL: 1240 #endif 1241 if ((vnd->sc_flags & VNF_INITED) == 0) 1242 return ENXIO; 1243 } 1244 1245 error = disk_ioctl(&vnd->sc_dkdev, dev, cmd, data, flag, l); 1246 if (error != EPASSTHROUGH) 1247 return error; 1248 1249 1250 switch (cmd) { 1251 case VNDIOCSET50: 1252 case VNDIOCSET: 1253 if (vnd->sc_flags & VNF_INITED) 1254 return EBUSY; 1255 1256 if ((error = vndlock(vnd)) != 0) 1257 return error; 1258 1259 fflags = FREAD; 1260 if ((vio->vnd_flags & VNDIOF_READONLY) == 0) 1261 fflags |= FWRITE; 1262 if ((vio->vnd_flags & VNDIOF_FILEIO) != 0) 1263 vnd->sc_flags |= VNF_USE_VN_RDWR; 1264 error = pathbuf_copyin(vio->vnd_file, &pb); 1265 if (error) { 1266 goto unlock_and_exit; 1267 } 1268 NDINIT(&nd, LOOKUP, FOLLOW, pb); 1269 if ((error = vn_open(&nd, fflags, 0)) != 0) { 1270 pathbuf_destroy(pb); 1271 goto unlock_and_exit; 1272 } 1273 KASSERT(l); 1274 error = VOP_GETATTR(nd.ni_vp, &vattr, l->l_cred); 1275 if (!error && nd.ni_vp->v_type != VREG) 1276 error = EOPNOTSUPP; 1277 if (!error && vattr.va_bytes < vattr.va_size) 1278 /* File is definitely sparse, use vn_rdwr() */ 1279 vnd->sc_flags |= VNF_USE_VN_RDWR; 1280 if (error) { 1281 VOP_UNLOCK(nd.ni_vp); 1282 goto close_and_exit; 1283 } 1284 1285 /* If using a compressed file, initialize its info */ 1286 /* (or abort with an error if kernel has no compression) */ 1287 if (vio->vnd_flags & VNDIOF_COMP) { 1288 #ifdef VND_COMPRESSION 1289 struct vnd_comp_header *ch; 1290 int i; 1291 uint32_t comp_size; 1292 uint32_t comp_maxsize; 1293 1294 /* allocate space for compresed file header */ 1295 ch = malloc(sizeof(struct vnd_comp_header), 1296 M_TEMP, M_WAITOK); 1297 1298 /* read compressed file header */ 1299 error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)ch, 1300 sizeof(struct vnd_comp_header), 0, UIO_SYSSPACE, 1301 IO_UNIT|IO_NODELOCKED, l->l_cred, NULL, NULL); 1302 if (error) { 1303 free(ch, M_TEMP); 1304 VOP_UNLOCK(nd.ni_vp); 1305 goto close_and_exit; 1306 } 1307 1308 if (be32toh(ch->block_size) == 0 || 1309 be32toh(ch->num_blocks) > UINT32_MAX - 1) { 1310 free(ch, M_TEMP); 1311 VOP_UNLOCK(nd.ni_vp); 1312 goto close_and_exit; 1313 } 1314 1315 /* save some header info */ 1316 vnd->sc_comp_blksz = be32toh(ch->block_size); 1317 /* note last offset is the file byte size */ 1318 vnd->sc_comp_numoffs = be32toh(ch->num_blocks) + 1; 1319 free(ch, M_TEMP); 1320 if (!DK_DEV_BSIZE_OK(vnd->sc_comp_blksz)) { 1321 VOP_UNLOCK(nd.ni_vp); 1322 error = EINVAL; 1323 goto close_and_exit; 1324 } 1325 KASSERT(0 < vnd->sc_comp_blksz); 1326 KASSERT(0 < vnd->sc_comp_numoffs); 1327 /* 1328 * @#^@!$& gcc -Wtype-limits refuses to let me 1329 * write SIZE_MAX/sizeof(uint64_t) < numoffs, 1330 * because the range of the type on amd64 makes 1331 * the comparisons always false. 1332 */ 1333 #if SIZE_MAX <= UINT32_MAX*(64/CHAR_BIT) 1334 if (SIZE_MAX/sizeof(uint64_t) < vnd->sc_comp_numoffs) { 1335 VOP_UNLOCK(nd.ni_vp); 1336 error = EINVAL; 1337 goto close_and_exit; 1338 } 1339 #endif 1340 if ((vattr.va_size < sizeof(struct vnd_comp_header)) || 1341 (vattr.va_size - sizeof(struct vnd_comp_header) < 1342 sizeof(uint64_t)*vnd->sc_comp_numoffs) || 1343 (UQUAD_MAX/vnd->sc_comp_blksz < 1344 vnd->sc_comp_numoffs - 1)) { 1345 VOP_UNLOCK(nd.ni_vp); 1346 error = EINVAL; 1347 goto close_and_exit; 1348 } 1349 1350 /* set decompressed file size */ 1351 KASSERT(vnd->sc_comp_numoffs - 1 <= 1352 UQUAD_MAX/vnd->sc_comp_blksz); 1353 vattr.va_size = 1354 ((u_quad_t)vnd->sc_comp_numoffs - 1) * 1355 (u_quad_t)vnd->sc_comp_blksz; 1356 1357 /* allocate space for all the compressed offsets */ 1358 __CTASSERT(UINT32_MAX <= UQUAD_MAX/sizeof(uint64_t)); 1359 vnd->sc_comp_offsets = 1360 malloc(sizeof(uint64_t) * vnd->sc_comp_numoffs, 1361 M_DEVBUF, M_WAITOK); 1362 1363 /* read in the offsets */ 1364 error = vn_rdwr(UIO_READ, nd.ni_vp, 1365 (void *)vnd->sc_comp_offsets, 1366 sizeof(uint64_t) * vnd->sc_comp_numoffs, 1367 sizeof(struct vnd_comp_header), UIO_SYSSPACE, 1368 IO_UNIT|IO_NODELOCKED, l->l_cred, NULL, NULL); 1369 if (error) { 1370 VOP_UNLOCK(nd.ni_vp); 1371 goto close_and_exit; 1372 } 1373 /* 1374 * find largest block size (used for allocation limit). 1375 * Also convert offset to native byte order. 1376 */ 1377 comp_maxsize = 0; 1378 for (i = 0; i < vnd->sc_comp_numoffs - 1; i++) { 1379 vnd->sc_comp_offsets[i] = 1380 be64toh(vnd->sc_comp_offsets[i]); 1381 comp_size = 1382 be64toh(vnd->sc_comp_offsets[i + 1]) 1383 - vnd->sc_comp_offsets[i]; 1384 if (comp_size > comp_maxsize) 1385 comp_maxsize = comp_size; 1386 } 1387 vnd->sc_comp_offsets[vnd->sc_comp_numoffs - 1] = 1388 be64toh(vnd->sc_comp_offsets[vnd->sc_comp_numoffs 1389 - 1]); 1390 1391 /* create compressed data buffer */ 1392 vnd->sc_comp_buff = malloc(comp_maxsize, 1393 M_DEVBUF, M_WAITOK); 1394 1395 /* create decompressed buffer */ 1396 vnd->sc_comp_decombuf = malloc(vnd->sc_comp_blksz, 1397 M_DEVBUF, M_WAITOK); 1398 vnd->sc_comp_buffblk = -1; 1399 1400 /* Initialize decompress stream */ 1401 memset(&vnd->sc_comp_stream, 0, sizeof(z_stream)); 1402 vnd->sc_comp_stream.zalloc = vnd_alloc; 1403 vnd->sc_comp_stream.zfree = vnd_free; 1404 error = inflateInit2(&vnd->sc_comp_stream, MAX_WBITS); 1405 if (error) { 1406 if (vnd->sc_comp_stream.msg) 1407 printf("vnd%d: compressed file, %s\n", 1408 unit, vnd->sc_comp_stream.msg); 1409 VOP_UNLOCK(nd.ni_vp); 1410 error = EINVAL; 1411 goto close_and_exit; 1412 } 1413 1414 vnd->sc_flags |= VNF_COMP | VNF_READONLY; 1415 #else /* !VND_COMPRESSION */ 1416 VOP_UNLOCK(nd.ni_vp); 1417 error = EOPNOTSUPP; 1418 goto close_and_exit; 1419 #endif /* VND_COMPRESSION */ 1420 } 1421 1422 VOP_UNLOCK(nd.ni_vp); 1423 vnd->sc_vp = nd.ni_vp; 1424 vnd->sc_size = btodb(vattr.va_size); /* note truncation */ 1425 1426 /* get smallest I/O size for underlying device, fall back to 1427 * fundamental I/O size of underlying filesystem 1428 */ 1429 error = bdev_ioctl(vattr.va_fsid, DIOCGSECTORSIZE, &vnd->sc_iosize, FKIOCTL, l); 1430 if (error) 1431 vnd->sc_iosize = vnd->sc_vp->v_mount->mnt_stat.f_frsize; 1432 1433 /* 1434 * Use pseudo-geometry specified. If none was provided, 1435 * use "standard" Adaptec fictitious geometry. 1436 */ 1437 if (vio->vnd_flags & VNDIOF_HASGEOM) { 1438 1439 memcpy(&vnd->sc_geom, &vio->vnd_geom, 1440 sizeof(vio->vnd_geom)); 1441 1442 /* 1443 * Sanity-check the sector size. 1444 */ 1445 if (!DK_DEV_BSIZE_OK(vnd->sc_geom.vng_secsize) || 1446 vnd->sc_geom.vng_ntracks == 0 || 1447 vnd->sc_geom.vng_nsectors == 0) { 1448 error = EINVAL; 1449 goto close_and_exit; 1450 } 1451 1452 /* 1453 * Compute missing cylinder count from size 1454 */ 1455 if (vnd->sc_geom.vng_ncylinders == 0) 1456 vnd->sc_geom.vng_ncylinders = vnd->sc_size / 1457 (vnd->sc_geom.vng_ntracks * 1458 vnd->sc_geom.vng_nsectors); 1459 1460 /* 1461 * Compute the size (in DEV_BSIZE blocks) specified 1462 * by the geometry. 1463 */ 1464 geomsize = (int64_t)vnd->sc_geom.vng_nsectors * 1465 vnd->sc_geom.vng_ntracks * 1466 vnd->sc_geom.vng_ncylinders * 1467 (vnd->sc_geom.vng_secsize / DEV_BSIZE); 1468 1469 /* 1470 * Sanity-check the size against the specified 1471 * geometry. 1472 */ 1473 if (vnd->sc_size < geomsize) { 1474 error = EINVAL; 1475 goto close_and_exit; 1476 } 1477 } else if (vnd->sc_size >= (32 * 64)) { 1478 /* 1479 * Size must be at least 2048 DEV_BSIZE blocks 1480 * (1M) in order to use this geometry. 1481 */ 1482 vnd->sc_geom.vng_secsize = DEV_BSIZE; 1483 vnd->sc_geom.vng_nsectors = 32; 1484 vnd->sc_geom.vng_ntracks = 64; 1485 vnd->sc_geom.vng_ncylinders = vnd->sc_size / (64 * 32); 1486 } else { 1487 vnd->sc_geom.vng_secsize = DEV_BSIZE; 1488 vnd->sc_geom.vng_nsectors = 1; 1489 vnd->sc_geom.vng_ntracks = 1; 1490 vnd->sc_geom.vng_ncylinders = vnd->sc_size; 1491 } 1492 1493 vnd_set_geometry(vnd); 1494 1495 if (vio->vnd_flags & VNDIOF_READONLY) { 1496 vnd->sc_flags |= VNF_READONLY; 1497 } 1498 1499 if ((error = vndsetcred(vnd, l->l_cred)) != 0) 1500 goto close_and_exit; 1501 1502 vndthrottle(vnd, vnd->sc_vp); 1503 vio->vnd_osize = dbtob(vnd->sc_size); 1504 if (cmd != VNDIOCSET50) 1505 vio->vnd_size = dbtob(vnd->sc_size); 1506 vnd->sc_flags |= VNF_INITED; 1507 1508 /* create the kernel thread, wait for it to be up */ 1509 error = kthread_create(PRI_NONE, 0, NULL, vndthread, vnd, 1510 &vnd->sc_kthread, "%s", device_xname(vnd->sc_dev)); 1511 if (error) 1512 goto close_and_exit; 1513 while ((vnd->sc_flags & VNF_KTHREAD) == 0) { 1514 tsleep(&vnd->sc_kthread, PRIBIO, "vndthr", 0); 1515 } 1516 #ifdef DEBUG 1517 if (vnddebug & VDB_INIT) 1518 printf("vndioctl: SET vp %p size 0x%lx %d/%d/%d/%d\n", 1519 vnd->sc_vp, (unsigned long) vnd->sc_size, 1520 vnd->sc_geom.vng_secsize, 1521 vnd->sc_geom.vng_nsectors, 1522 vnd->sc_geom.vng_ntracks, 1523 vnd->sc_geom.vng_ncylinders); 1524 #endif 1525 1526 /* Attach the disk. */ 1527 disk_attach(&vnd->sc_dkdev); 1528 1529 /* Initialize the xfer and buffer pools. */ 1530 pool_init(&vnd->sc_vxpool, sizeof(struct vndxfer), 0, 1531 0, 0, "vndxpl", NULL, IPL_BIO); 1532 1533 vndunlock(vnd); 1534 1535 pathbuf_destroy(pb); 1536 1537 /* Discover wedges on this disk */ 1538 dkwedge_discover(&vnd->sc_dkdev); 1539 1540 break; 1541 1542 close_and_exit: 1543 (void) vn_close(nd.ni_vp, fflags, l->l_cred); 1544 pathbuf_destroy(pb); 1545 unlock_and_exit: 1546 #ifdef VND_COMPRESSION 1547 /* free any allocated memory (for compressed file) */ 1548 if (vnd->sc_comp_offsets) { 1549 free(vnd->sc_comp_offsets, M_DEVBUF); 1550 vnd->sc_comp_offsets = NULL; 1551 } 1552 if (vnd->sc_comp_buff) { 1553 free(vnd->sc_comp_buff, M_DEVBUF); 1554 vnd->sc_comp_buff = NULL; 1555 } 1556 if (vnd->sc_comp_decombuf) { 1557 free(vnd->sc_comp_decombuf, M_DEVBUF); 1558 vnd->sc_comp_decombuf = NULL; 1559 } 1560 #endif /* VND_COMPRESSION */ 1561 vndunlock(vnd); 1562 return error; 1563 1564 case VNDIOCCLR50: 1565 case VNDIOCCLR: 1566 part = DISKPART(dev); 1567 pmask = (1 << part); 1568 force = (vio->vnd_flags & VNDIOF_FORCE) != 0; 1569 1570 if ((error = vnddoclear(vnd, pmask, minor(dev), force)) != 0) 1571 return error; 1572 1573 break; 1574 1575 1576 case DIOCWDINFO: 1577 case DIOCSDINFO: 1578 #ifdef __HAVE_OLD_DISKLABEL 1579 case ODIOCWDINFO: 1580 case ODIOCSDINFO: 1581 #endif 1582 { 1583 struct disklabel *lp; 1584 1585 if ((error = vndlock(vnd)) != 0) 1586 return error; 1587 1588 vnd->sc_flags |= VNF_LABELLING; 1589 1590 #ifdef __HAVE_OLD_DISKLABEL 1591 if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) { 1592 memset(&newlabel, 0, sizeof newlabel); 1593 memcpy(&newlabel, data, sizeof (struct olddisklabel)); 1594 lp = &newlabel; 1595 } else 1596 #endif 1597 lp = (struct disklabel *)data; 1598 1599 error = setdisklabel(vnd->sc_dkdev.dk_label, 1600 lp, 0, vnd->sc_dkdev.dk_cpulabel); 1601 if (error == 0) { 1602 if (cmd == DIOCWDINFO 1603 #ifdef __HAVE_OLD_DISKLABEL 1604 || cmd == ODIOCWDINFO 1605 #endif 1606 ) 1607 error = writedisklabel(VNDLABELDEV(dev), 1608 vndstrategy, vnd->sc_dkdev.dk_label, 1609 vnd->sc_dkdev.dk_cpulabel); 1610 } 1611 1612 vnd->sc_flags &= ~VNF_LABELLING; 1613 1614 vndunlock(vnd); 1615 1616 if (error) 1617 return error; 1618 break; 1619 } 1620 1621 case DIOCKLABEL: 1622 if (*(int *)data != 0) 1623 vnd->sc_flags |= VNF_KLABEL; 1624 else 1625 vnd->sc_flags &= ~VNF_KLABEL; 1626 break; 1627 1628 case DIOCWLABEL: 1629 if (*(int *)data != 0) 1630 vnd->sc_flags |= VNF_WLABEL; 1631 else 1632 vnd->sc_flags &= ~VNF_WLABEL; 1633 break; 1634 1635 case DIOCGDEFLABEL: 1636 vndgetdefaultlabel(vnd, (struct disklabel *)data); 1637 break; 1638 1639 #ifdef __HAVE_OLD_DISKLABEL 1640 case ODIOCGDEFLABEL: 1641 vndgetdefaultlabel(vnd, &newlabel); 1642 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 1643 return ENOTTY; 1644 memcpy(data, &newlabel, sizeof (struct olddisklabel)); 1645 break; 1646 #endif 1647 1648 case DIOCCACHESYNC: 1649 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 1650 error = VOP_FSYNC(vnd->sc_vp, vnd->sc_cred, 1651 FSYNC_WAIT | FSYNC_DATAONLY | FSYNC_CACHE, 0, 0); 1652 VOP_UNLOCK(vnd->sc_vp); 1653 return error; 1654 1655 default: 1656 return ENOTTY; 1657 } 1658 1659 return 0; 1660 } 1661 1662 /* 1663 * Duplicate the current processes' credentials. Since we are called only 1664 * as the result of a SET ioctl and only root can do that, any future access 1665 * to this "disk" is essentially as root. Note that credentials may change 1666 * if some other uid can write directly to the mapped file (NFS). 1667 */ 1668 static int 1669 vndsetcred(struct vnd_softc *vnd, kauth_cred_t cred) 1670 { 1671 struct uio auio; 1672 struct iovec aiov; 1673 char *tmpbuf; 1674 int error; 1675 1676 vnd->sc_cred = kauth_cred_dup(cred); 1677 tmpbuf = malloc(DEV_BSIZE, M_TEMP, M_WAITOK); 1678 1679 /* XXX: Horrible kludge to establish credentials for NFS */ 1680 aiov.iov_base = tmpbuf; 1681 aiov.iov_len = uimin(DEV_BSIZE, dbtob(vnd->sc_size)); 1682 auio.uio_iov = &aiov; 1683 auio.uio_iovcnt = 1; 1684 auio.uio_offset = 0; 1685 auio.uio_rw = UIO_READ; 1686 auio.uio_resid = aiov.iov_len; 1687 UIO_SETUP_SYSSPACE(&auio); 1688 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 1689 error = VOP_READ(vnd->sc_vp, &auio, 0, vnd->sc_cred); 1690 if (error == 0) { 1691 /* 1692 * Because vnd does all IO directly through the vnode 1693 * we need to flush (at least) the buffer from the above 1694 * VOP_READ from the buffer cache to prevent cache 1695 * incoherencies. Also, be careful to write dirty 1696 * buffers back to stable storage. 1697 */ 1698 error = vinvalbuf(vnd->sc_vp, V_SAVE, vnd->sc_cred, 1699 curlwp, 0, 0); 1700 } 1701 VOP_UNLOCK(vnd->sc_vp); 1702 1703 free(tmpbuf, M_TEMP); 1704 return error; 1705 } 1706 1707 /* 1708 * Set maxactive based on FS type 1709 */ 1710 static void 1711 vndthrottle(struct vnd_softc *vnd, struct vnode *vp) 1712 { 1713 1714 if (vp->v_tag == VT_NFS) 1715 vnd->sc_maxactive = 2; 1716 else 1717 vnd->sc_maxactive = 8; 1718 1719 if (vnd->sc_maxactive < 1) 1720 vnd->sc_maxactive = 1; 1721 } 1722 1723 #if 0 1724 static void 1725 vndshutdown(void) 1726 { 1727 struct vnd_softc *vnd; 1728 1729 for (vnd = &vnd_softc[0]; vnd < &vnd_softc[numvnd]; vnd++) 1730 if (vnd->sc_flags & VNF_INITED) 1731 vndclear(vnd); 1732 } 1733 #endif 1734 1735 static void 1736 vndclear(struct vnd_softc *vnd, int myminor) 1737 { 1738 struct vnode *vp = vnd->sc_vp; 1739 int fflags = FREAD; 1740 int bmaj, cmaj, i, mn; 1741 int s; 1742 1743 #ifdef DEBUG 1744 if (vnddebug & VDB_FOLLOW) 1745 printf("vndclear(%p): vp %p\n", vnd, vp); 1746 #endif 1747 /* locate the major number */ 1748 bmaj = bdevsw_lookup_major(&vnd_bdevsw); 1749 cmaj = cdevsw_lookup_major(&vnd_cdevsw); 1750 1751 /* Nuke the vnodes for any open instances */ 1752 for (i = 0; i < MAXPARTITIONS; i++) { 1753 mn = DISKMINOR(device_unit(vnd->sc_dev), i); 1754 vdevgone(bmaj, mn, mn, VBLK); 1755 if (mn != myminor) /* XXX avoid to kill own vnode */ 1756 vdevgone(cmaj, mn, mn, VCHR); 1757 } 1758 1759 if ((vnd->sc_flags & VNF_READONLY) == 0) 1760 fflags |= FWRITE; 1761 1762 s = splbio(); 1763 bufq_drain(vnd->sc_tab); 1764 splx(s); 1765 1766 vnd->sc_flags |= VNF_VUNCONF; 1767 wakeup(&vnd->sc_tab); 1768 while (vnd->sc_flags & VNF_KTHREAD) 1769 tsleep(&vnd->sc_kthread, PRIBIO, "vnthr", 0); 1770 1771 #ifdef VND_COMPRESSION 1772 /* free the compressed file buffers */ 1773 if (vnd->sc_flags & VNF_COMP) { 1774 if (vnd->sc_comp_offsets) { 1775 free(vnd->sc_comp_offsets, M_DEVBUF); 1776 vnd->sc_comp_offsets = NULL; 1777 } 1778 if (vnd->sc_comp_buff) { 1779 free(vnd->sc_comp_buff, M_DEVBUF); 1780 vnd->sc_comp_buff = NULL; 1781 } 1782 if (vnd->sc_comp_decombuf) { 1783 free(vnd->sc_comp_decombuf, M_DEVBUF); 1784 vnd->sc_comp_decombuf = NULL; 1785 } 1786 } 1787 #endif /* VND_COMPRESSION */ 1788 vnd->sc_flags &= 1789 ~(VNF_INITED | VNF_READONLY | VNF_KLABEL | VNF_VLABEL 1790 | VNF_VUNCONF | VNF_COMP | VNF_CLEARING); 1791 if (vp == NULL) 1792 panic("vndclear: null vp"); 1793 (void) vn_close(vp, fflags, vnd->sc_cred); 1794 kauth_cred_free(vnd->sc_cred); 1795 vnd->sc_vp = NULL; 1796 vnd->sc_cred = NULL; 1797 vnd->sc_size = 0; 1798 } 1799 1800 static int 1801 vndsize(dev_t dev) 1802 { 1803 struct vnd_softc *sc; 1804 struct disklabel *lp; 1805 int part, unit, omask; 1806 int size; 1807 1808 unit = vndunit(dev); 1809 sc = device_lookup_private(&vnd_cd, unit); 1810 if (sc == NULL) 1811 return -1; 1812 1813 if ((sc->sc_flags & VNF_INITED) == 0) 1814 return -1; 1815 1816 part = DISKPART(dev); 1817 omask = sc->sc_dkdev.dk_openmask & (1 << part); 1818 lp = sc->sc_dkdev.dk_label; 1819 1820 if (omask == 0 && vndopen(dev, 0, S_IFBLK, curlwp)) /* XXX */ 1821 return -1; 1822 1823 if (lp->d_partitions[part].p_fstype != FS_SWAP) 1824 size = -1; 1825 else 1826 size = lp->d_partitions[part].p_size * 1827 (lp->d_secsize / DEV_BSIZE); 1828 1829 if (omask == 0 && vndclose(dev, 0, S_IFBLK, curlwp)) /* XXX */ 1830 return -1; 1831 1832 return size; 1833 } 1834 1835 static int 1836 vnddump(dev_t dev, daddr_t blkno, void *va, 1837 size_t size) 1838 { 1839 1840 /* Not implemented. */ 1841 return ENXIO; 1842 } 1843 1844 static void 1845 vndgetdefaultlabel(struct vnd_softc *sc, struct disklabel *lp) 1846 { 1847 struct vndgeom *vng = &sc->sc_geom; 1848 struct partition *pp; 1849 unsigned spb; 1850 1851 memset(lp, 0, sizeof(*lp)); 1852 1853 spb = vng->vng_secsize / DEV_BSIZE; 1854 if (sc->sc_size / spb > UINT32_MAX) 1855 lp->d_secperunit = UINT32_MAX; 1856 else 1857 lp->d_secperunit = sc->sc_size / spb; 1858 lp->d_secsize = vng->vng_secsize; 1859 lp->d_nsectors = vng->vng_nsectors; 1860 lp->d_ntracks = vng->vng_ntracks; 1861 lp->d_ncylinders = vng->vng_ncylinders; 1862 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 1863 1864 strncpy(lp->d_typename, "vnd", sizeof(lp->d_typename)); 1865 lp->d_type = DKTYPE_VND; 1866 strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname)); 1867 lp->d_rpm = 3600; 1868 lp->d_interleave = 1; 1869 lp->d_flags = 0; 1870 1871 pp = &lp->d_partitions[RAW_PART]; 1872 pp->p_offset = 0; 1873 pp->p_size = lp->d_secperunit; 1874 pp->p_fstype = FS_UNUSED; 1875 lp->d_npartitions = RAW_PART + 1; 1876 1877 lp->d_magic = DISKMAGIC; 1878 lp->d_magic2 = DISKMAGIC; 1879 lp->d_checksum = dkcksum(lp); 1880 } 1881 1882 /* 1883 * Read the disklabel from a vnd. If one is not present, create a fake one. 1884 */ 1885 static void 1886 vndgetdisklabel(dev_t dev, struct vnd_softc *sc) 1887 { 1888 const char *errstring; 1889 struct disklabel *lp = sc->sc_dkdev.dk_label; 1890 struct cpu_disklabel *clp = sc->sc_dkdev.dk_cpulabel; 1891 int i; 1892 1893 memset(clp, 0, sizeof(*clp)); 1894 1895 vndgetdefaultlabel(sc, lp); 1896 1897 /* 1898 * Call the generic disklabel extraction routine. 1899 */ 1900 errstring = readdisklabel(VNDLABELDEV(dev), vndstrategy, lp, clp); 1901 if (errstring) { 1902 /* 1903 * Lack of disklabel is common, but we print the warning 1904 * anyway, since it might contain other useful information. 1905 */ 1906 aprint_normal_dev(sc->sc_dev, "%s\n", errstring); 1907 1908 /* 1909 * For historical reasons, if there's no disklabel 1910 * present, all partitions must be FS_BSDFFS and 1911 * occupy the entire disk. 1912 */ 1913 for (i = 0; i < MAXPARTITIONS; i++) { 1914 /* 1915 * Don't wipe out port specific hack (such as 1916 * dos partition hack of i386 port). 1917 */ 1918 if (lp->d_partitions[i].p_size != 0) 1919 continue; 1920 1921 lp->d_partitions[i].p_size = lp->d_secperunit; 1922 lp->d_partitions[i].p_offset = 0; 1923 lp->d_partitions[i].p_fstype = FS_BSDFFS; 1924 } 1925 1926 strncpy(lp->d_packname, "default label", 1927 sizeof(lp->d_packname)); 1928 1929 lp->d_npartitions = MAXPARTITIONS; 1930 lp->d_checksum = dkcksum(lp); 1931 } 1932 } 1933 1934 /* 1935 * Wait interruptibly for an exclusive lock. 1936 * 1937 * XXX 1938 * Several drivers do this; it should be abstracted and made MP-safe. 1939 */ 1940 static int 1941 vndlock(struct vnd_softc *sc) 1942 { 1943 int error; 1944 1945 while ((sc->sc_flags & VNF_LOCKED) != 0) { 1946 sc->sc_flags |= VNF_WANTED; 1947 if ((error = tsleep(sc, PRIBIO | PCATCH, "vndlck", 0)) != 0) 1948 return error; 1949 } 1950 sc->sc_flags |= VNF_LOCKED; 1951 return 0; 1952 } 1953 1954 /* 1955 * Unlock and wake up any waiters. 1956 */ 1957 static void 1958 vndunlock(struct vnd_softc *sc) 1959 { 1960 1961 sc->sc_flags &= ~VNF_LOCKED; 1962 if ((sc->sc_flags & VNF_WANTED) != 0) { 1963 sc->sc_flags &= ~VNF_WANTED; 1964 wakeup(sc); 1965 } 1966 } 1967 1968 #ifdef VND_COMPRESSION 1969 /* compressed file read */ 1970 static void 1971 compstrategy(struct buf *bp, off_t bn) 1972 { 1973 int error; 1974 int unit = vndunit(bp->b_dev); 1975 struct vnd_softc *vnd = 1976 device_lookup_private(&vnd_cd, unit); 1977 u_int32_t comp_block; 1978 struct uio auio; 1979 char *addr; 1980 int s; 1981 1982 /* set up constants for data move */ 1983 auio.uio_rw = UIO_READ; 1984 UIO_SETUP_SYSSPACE(&auio); 1985 1986 /* read, and transfer the data */ 1987 addr = bp->b_data; 1988 bp->b_resid = bp->b_bcount; 1989 s = splbio(); 1990 while (bp->b_resid > 0) { 1991 unsigned length; 1992 size_t length_in_buffer; 1993 u_int32_t offset_in_buffer; 1994 struct iovec aiov; 1995 1996 /* calculate the compressed block number */ 1997 comp_block = bn / (off_t)vnd->sc_comp_blksz; 1998 1999 /* check for good block number */ 2000 if (comp_block >= vnd->sc_comp_numoffs) { 2001 bp->b_error = EINVAL; 2002 splx(s); 2003 return; 2004 } 2005 2006 /* read in the compressed block, if not in buffer */ 2007 if (comp_block != vnd->sc_comp_buffblk) { 2008 length = vnd->sc_comp_offsets[comp_block + 1] - 2009 vnd->sc_comp_offsets[comp_block]; 2010 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 2011 error = vn_rdwr(UIO_READ, vnd->sc_vp, vnd->sc_comp_buff, 2012 length, vnd->sc_comp_offsets[comp_block], 2013 UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, vnd->sc_cred, 2014 NULL, NULL); 2015 if (error) { 2016 bp->b_error = error; 2017 VOP_UNLOCK(vnd->sc_vp); 2018 splx(s); 2019 return; 2020 } 2021 /* uncompress the buffer */ 2022 vnd->sc_comp_stream.next_in = vnd->sc_comp_buff; 2023 vnd->sc_comp_stream.avail_in = length; 2024 vnd->sc_comp_stream.next_out = vnd->sc_comp_decombuf; 2025 vnd->sc_comp_stream.avail_out = vnd->sc_comp_blksz; 2026 inflateReset(&vnd->sc_comp_stream); 2027 error = inflate(&vnd->sc_comp_stream, Z_FINISH); 2028 if (error != Z_STREAM_END) { 2029 if (vnd->sc_comp_stream.msg) 2030 aprint_normal_dev(vnd->sc_dev, 2031 "compressed file, %s\n", 2032 vnd->sc_comp_stream.msg); 2033 bp->b_error = EBADMSG; 2034 VOP_UNLOCK(vnd->sc_vp); 2035 splx(s); 2036 return; 2037 } 2038 vnd->sc_comp_buffblk = comp_block; 2039 VOP_UNLOCK(vnd->sc_vp); 2040 } 2041 2042 /* transfer the usable uncompressed data */ 2043 offset_in_buffer = bn % (off_t)vnd->sc_comp_blksz; 2044 length_in_buffer = vnd->sc_comp_blksz - offset_in_buffer; 2045 if (length_in_buffer > bp->b_resid) 2046 length_in_buffer = bp->b_resid; 2047 auio.uio_iov = &aiov; 2048 auio.uio_iovcnt = 1; 2049 aiov.iov_base = addr; 2050 aiov.iov_len = length_in_buffer; 2051 auio.uio_resid = aiov.iov_len; 2052 auio.uio_offset = 0; 2053 error = uiomove(vnd->sc_comp_decombuf + offset_in_buffer, 2054 length_in_buffer, &auio); 2055 if (error) { 2056 bp->b_error = error; 2057 splx(s); 2058 return; 2059 } 2060 2061 bn += length_in_buffer; 2062 addr += length_in_buffer; 2063 bp->b_resid -= length_in_buffer; 2064 } 2065 splx(s); 2066 } 2067 2068 /* compression memory allocation routines */ 2069 static void * 2070 vnd_alloc(void *aux, u_int items, u_int siz) 2071 { 2072 return malloc(items * siz, M_TEMP, M_NOWAIT); 2073 } 2074 2075 static void 2076 vnd_free(void *aux, void *ptr) 2077 { 2078 free(ptr, M_TEMP); 2079 } 2080 #endif /* VND_COMPRESSION */ 2081 2082 static void 2083 vnd_set_geometry(struct vnd_softc *vnd) 2084 { 2085 struct disk_geom *dg = &vnd->sc_dkdev.dk_geom; 2086 2087 memset(dg, 0, sizeof(*dg)); 2088 2089 dg->dg_secperunit = (int64_t)vnd->sc_geom.vng_nsectors * 2090 vnd->sc_geom.vng_ntracks * vnd->sc_geom.vng_ncylinders; 2091 dg->dg_secsize = vnd->sc_geom.vng_secsize; 2092 dg->dg_nsectors = vnd->sc_geom.vng_nsectors; 2093 dg->dg_ntracks = vnd->sc_geom.vng_ntracks; 2094 dg->dg_ncylinders = vnd->sc_geom.vng_ncylinders; 2095 2096 #ifdef DEBUG 2097 if (vnddebug & VDB_LABEL) { 2098 printf("dg->dg_secperunit: %" PRId64 "\n", dg->dg_secperunit); 2099 printf("dg->dg_ncylinders: %u\n", dg->dg_ncylinders); 2100 } 2101 #endif 2102 disk_set_info(vnd->sc_dev, &vnd->sc_dkdev, NULL); 2103 } 2104 2105 #ifdef VND_COMPRESSION 2106 #define VND_DEPENDS "zlib" 2107 #else 2108 #define VND_DEPENDS NULL 2109 #endif 2110 2111 MODULE(MODULE_CLASS_DRIVER, vnd, VND_DEPENDS); 2112 2113 #ifdef _MODULE 2114 int vnd_bmajor = -1, vnd_cmajor = -1; 2115 2116 CFDRIVER_DECL(vnd, DV_DISK, NULL); 2117 #endif 2118 2119 static int 2120 vnd_modcmd(modcmd_t cmd, void *arg) 2121 { 2122 int error = 0; 2123 2124 switch (cmd) { 2125 case MODULE_CMD_INIT: 2126 #ifdef _MODULE 2127 error = config_cfdriver_attach(&vnd_cd); 2128 if (error) 2129 break; 2130 2131 error = config_cfattach_attach(vnd_cd.cd_name, &vnd_ca); 2132 if (error) { 2133 config_cfdriver_detach(&vnd_cd); 2134 #ifdef DIAGNOSTIC 2135 aprint_error("%s: unable to register cfattach for \n" 2136 "%s, error %d", __func__, vnd_cd.cd_name, error); 2137 #endif 2138 break; 2139 } 2140 2141 /* 2142 * Attach the {b,c}devsw's 2143 */ 2144 error = devsw_attach("vnd", &vnd_bdevsw, &vnd_bmajor, 2145 &vnd_cdevsw, &vnd_cmajor); 2146 /* 2147 * If devsw_attach fails, remove from autoconf database 2148 */ 2149 if (error) { 2150 config_cfattach_detach(vnd_cd.cd_name, &vnd_ca); 2151 config_cfdriver_detach(&vnd_cd); 2152 #ifdef DIAGNOSTIC 2153 aprint_error("%s: unable to attach %s devsw, " 2154 "error %d", __func__, vnd_cd.cd_name, error); 2155 #endif 2156 break; 2157 } 2158 #endif 2159 break; 2160 2161 case MODULE_CMD_FINI: 2162 #ifdef _MODULE 2163 /* 2164 * Remove {b,c}devsw's 2165 */ 2166 devsw_detach(&vnd_bdevsw, &vnd_cdevsw); 2167 2168 /* 2169 * Now remove device from autoconf database 2170 */ 2171 error = config_cfattach_detach(vnd_cd.cd_name, &vnd_ca); 2172 if (error) { 2173 (void)devsw_attach("vnd", &vnd_bdevsw, &vnd_bmajor, 2174 &vnd_cdevsw, &vnd_cmajor); 2175 #ifdef DIAGNOSTIC 2176 aprint_error("%s: failed to detach %s cfattach, " 2177 "error %d\n", __func__, vnd_cd.cd_name, error); 2178 #endif 2179 break; 2180 } 2181 error = config_cfdriver_detach(&vnd_cd); 2182 if (error) { 2183 (void)config_cfattach_attach(vnd_cd.cd_name, &vnd_ca); 2184 (void)devsw_attach("vnd", &vnd_bdevsw, &vnd_bmajor, 2185 &vnd_cdevsw, &vnd_cmajor); 2186 #ifdef DIAGNOSTIC 2187 aprint_error("%s: failed to detach %s cfdriver, " 2188 "error %d\n", __func__, vnd_cd.cd_name, error); 2189 break; 2190 #endif 2191 } 2192 #endif 2193 break; 2194 2195 case MODULE_CMD_STAT: 2196 return ENOTTY; 2197 2198 default: 2199 return ENOTTY; 2200 } 2201 2202 return error; 2203 } 2204
Indexes created Mon Sep 29 21:09:56 GMT 2025