1 /* $NetBSD: vnd.c,v 1.140 2006/02/04 13:40:38 yamt Exp $ */ 2 3 /*- 4 * Copyright (c) 1996, 1997, 1998 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Copyright (c) 1990, 1993 41 * The Regents of the University of California. All rights reserved. 42 * 43 * This code is derived from software contributed to Berkeley by 44 * the Systems Programming Group of the University of Utah Computer 45 * Science Department. 46 * 47 * Redistribution and use in source and binary forms, with or without 48 * modification, are permitted provided that the following conditions 49 * are met: 50 * 1. Redistributions of source code must retain the above copyright 51 * notice, this list of conditions and the following disclaimer. 52 * 2. Redistributions in binary form must reproduce the above copyright 53 * notice, this list of conditions and the following disclaimer in the 54 * documentation and/or other materials provided with the distribution. 55 * 3. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 * 71 * from: Utah $Hdr: vn.c 1.13 94/04/02$ 72 * 73 * @(#)vn.c 8.9 (Berkeley) 5/14/95 74 */ 75 76 /* 77 * Copyright (c) 1988 University of Utah. 78 * 79 * This code is derived from software contributed to Berkeley by 80 * the Systems Programming Group of the University of Utah Computer 81 * Science Department. 82 * 83 * Redistribution and use in source and binary forms, with or without 84 * modification, are permitted provided that the following conditions 85 * are met: 86 * 1. Redistributions of source code must retain the above copyright 87 * notice, this list of conditions and the following disclaimer. 88 * 2. Redistributions in binary form must reproduce the above copyright 89 * notice, this list of conditions and the following disclaimer in the 90 * documentation and/or other materials provided with the distribution. 91 * 3. All advertising materials mentioning features or use of this software 92 * must display the following acknowledgement: 93 * This product includes software developed by the University of 94 * California, Berkeley and its contributors. 95 * 4. Neither the name of the University nor the names of its contributors 96 * may be used to endorse or promote products derived from this software 97 * without specific prior written permission. 98 * 99 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 100 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 101 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 102 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 103 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 104 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 105 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 106 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 107 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 108 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 109 * SUCH DAMAGE. 110 * 111 * from: Utah $Hdr: vn.c 1.13 94/04/02$ 112 * 113 * @(#)vn.c 8.9 (Berkeley) 5/14/95 114 */ 115 116 /* 117 * Vnode disk driver. 118 * 119 * Block/character interface to a vnode. Allows one to treat a file 120 * as a disk (e.g. build a filesystem in it, mount it, etc.). 121 * 122 * NOTE 1: This uses the VOP_BMAP/VOP_STRATEGY interface to the vnode 123 * instead of a simple VOP_RDWR. We do this to avoid distorting the 124 * local buffer cache. 125 * 126 * NOTE 2: There is a security issue involved with this driver. 127 * Once mounted all access to the contents of the "mapped" file via 128 * the special file is controlled by the permissions on the special 129 * file, the protection of the mapped file is ignored (effectively, 130 * by using root credentials in all transactions). 131 * 132 * NOTE 3: Doesn't interact with leases, should it? 133 */ 134 135 #include <sys/cdefs.h> 136 __KERNEL_RCSID(0, "$NetBSD: vnd.c,v 1.140 2006/02/04 13:40:38 yamt Exp $"); 137 138 #if defined(_KERNEL_OPT) 139 #include "fs_nfs.h" 140 #include "opt_vnd.h" 141 #endif 142 143 #include <sys/param.h> 144 #include <sys/systm.h> 145 #include <sys/namei.h> 146 #include <sys/proc.h> 147 #include <sys/kthread.h> 148 #include <sys/errno.h> 149 #include <sys/buf.h> 150 #include <sys/bufq.h> 151 #include <sys/malloc.h> 152 #include <sys/ioctl.h> 153 #include <sys/disklabel.h> 154 #include <sys/device.h> 155 #include <sys/disk.h> 156 #include <sys/stat.h> 157 #include <sys/mount.h> 158 #include <sys/vnode.h> 159 #include <sys/file.h> 160 #include <sys/uio.h> 161 #include <sys/conf.h> 162 #include <net/zlib.h> 163 164 #include <miscfs/specfs/specdev.h> 165 166 #include <dev/vndvar.h> 167 168 #if defined(VNDDEBUG) && !defined(DEBUG) 169 #define DEBUG 170 #endif 171 172 #ifdef DEBUG 173 int dovndcluster = 1; 174 #define VDB_FOLLOW 0x01 175 #define VDB_INIT 0x02 176 #define VDB_IO 0x04 177 #define VDB_LABEL 0x08 178 int vnddebug = 0x00; 179 #endif 180 181 #define vndunit(x) DISKUNIT(x) 182 183 struct vndxfer { 184 struct buf vx_buf; 185 struct vnd_softc *vx_vnd; 186 }; 187 #define VND_BUFTOXFER(bp) ((struct vndxfer *)(void *)bp) 188 189 #define VND_GETXFER(vnd) pool_get(&(vnd)->sc_vxpool, PR_WAITOK) 190 #define VND_PUTXFER(vnd, vx) pool_put(&(vnd)->sc_vxpool, (vx)) 191 192 #define VNDLABELDEV(dev) \ 193 (MAKEDISKDEV(major((dev)), vndunit((dev)), RAW_PART)) 194 195 /* called by main() at boot time (XXX: and the LKM driver) */ 196 void vndattach(int); 197 198 static void vndclear(struct vnd_softc *, int); 199 static int vndsetcred(struct vnd_softc *, struct ucred *); 200 static void vndthrottle(struct vnd_softc *, struct vnode *); 201 static void vndiodone(struct buf *); 202 #if 0 203 static void vndshutdown(void); 204 #endif 205 206 static void vndgetdefaultlabel(struct vnd_softc *, struct disklabel *); 207 static void vndgetdisklabel(dev_t, struct vnd_softc *); 208 209 static int vndlock(struct vnd_softc *); 210 static void vndunlock(struct vnd_softc *); 211 #ifdef VND_COMPRESSION 212 static void compstrategy(struct buf *, off_t); 213 static void *vnd_alloc(void *, u_int, u_int); 214 static void vnd_free(void *, void *); 215 #endif /* VND_COMPRESSION */ 216 217 static void vndthread(void *); 218 219 static dev_type_open(vndopen); 220 static dev_type_close(vndclose); 221 static dev_type_read(vndread); 222 static dev_type_write(vndwrite); 223 static dev_type_ioctl(vndioctl); 224 static dev_type_strategy(vndstrategy); 225 static dev_type_dump(vnddump); 226 static dev_type_size(vndsize); 227 228 const struct bdevsw vnd_bdevsw = { 229 vndopen, vndclose, vndstrategy, vndioctl, vnddump, vndsize, D_DISK 230 }; 231 232 const struct cdevsw vnd_cdevsw = { 233 vndopen, vndclose, vndread, vndwrite, vndioctl, 234 nostop, notty, nopoll, nommap, nokqfilter, D_DISK 235 }; 236 237 static int vnd_match(struct device *, struct cfdata *, void *); 238 static void vnd_attach(struct device *, struct device *, void *); 239 static int vnd_detach(struct device *, int); 240 241 CFATTACH_DECL(vnd, sizeof(struct vnd_softc), 242 vnd_match, vnd_attach, vnd_detach, NULL); 243 extern struct cfdriver vnd_cd; 244 245 static struct vnd_softc *vnd_spawn(int); 246 int vnd_destroy(struct device *); 247 248 void 249 vndattach(int num) 250 { 251 int error; 252 253 error = config_cfattach_attach(vnd_cd.cd_name, &vnd_ca); 254 if (error) 255 aprint_error("%s: unable to register cfattach\n", 256 vnd_cd.cd_name); 257 } 258 259 static int 260 vnd_match(struct device *self, struct cfdata *cfdata, void *aux) 261 { 262 return 1; 263 } 264 265 static void 266 vnd_attach(struct device *parent, struct device *self, void *aux) 267 { 268 struct vnd_softc *sc = (struct vnd_softc *)self; 269 270 sc->sc_comp_offsets = NULL; 271 sc->sc_comp_buff = NULL; 272 sc->sc_comp_decombuf = NULL; 273 bufq_alloc(&sc->sc_tab, "disksort", BUFQ_SORT_RAWBLOCK); 274 pseudo_disk_init(&sc->sc_dkdev); 275 276 aprint_normal("%s: vnode disk driver\n", self->dv_xname); 277 } 278 279 static int 280 vnd_detach(struct device *self, int flags) 281 { 282 struct vnd_softc *sc = (struct vnd_softc *)self; 283 if (sc->sc_flags & VNF_INITED) 284 return EBUSY; 285 286 bufq_free(sc->sc_tab); 287 288 return 0; 289 } 290 291 static struct vnd_softc * 292 vnd_spawn(int unit) 293 { 294 struct cfdata *cf; 295 296 cf = malloc(sizeof(*cf), M_DEVBUF, M_WAITOK); 297 cf->cf_name = vnd_cd.cd_name; 298 cf->cf_atname = vnd_cd.cd_name; 299 cf->cf_unit = unit; 300 cf->cf_fstate = FSTATE_STAR; 301 302 return (struct vnd_softc *)config_attach_pseudo(cf); 303 } 304 305 int 306 vnd_destroy(struct device *dev) 307 { 308 int error; 309 struct cfdata *cf; 310 311 cf = dev->dv_cfdata; 312 error = config_detach(dev, 0); 313 if (error) 314 return error; 315 free(cf, M_DEVBUF); 316 return 0; 317 } 318 319 static int 320 vndopen(dev_t dev, int flags, int mode, struct lwp *l) 321 { 322 int unit = vndunit(dev); 323 struct vnd_softc *sc; 324 int error = 0, part, pmask; 325 struct disklabel *lp; 326 327 #ifdef DEBUG 328 if (vnddebug & VDB_FOLLOW) 329 printf("vndopen(0x%x, 0x%x, 0x%x, %p)\n", dev, flags, mode, l); 330 #endif 331 sc = device_lookup(&vnd_cd, unit); 332 if (sc == NULL) { 333 sc = vnd_spawn(unit); 334 if (sc == NULL) 335 return ENOMEM; 336 } 337 338 if ((error = vndlock(sc)) != 0) 339 return (error); 340 341 lp = sc->sc_dkdev.dk_label; 342 343 part = DISKPART(dev); 344 pmask = (1 << part); 345 346 /* 347 * If we're initialized, check to see if there are any other 348 * open partitions. If not, then it's safe to update the 349 * in-core disklabel. Only read the disklabel if it is 350 * not already valid. 351 */ 352 if ((sc->sc_flags & (VNF_INITED|VNF_VLABEL)) == VNF_INITED && 353 sc->sc_dkdev.dk_openmask == 0) 354 vndgetdisklabel(dev, sc); 355 356 /* Check that the partitions exists. */ 357 if (part != RAW_PART) { 358 if (((sc->sc_flags & VNF_INITED) == 0) || 359 ((part >= lp->d_npartitions) || 360 (lp->d_partitions[part].p_fstype == FS_UNUSED))) { 361 error = ENXIO; 362 goto done; 363 } 364 } 365 366 /* Prevent our unit from being unconfigured while open. */ 367 switch (mode) { 368 case S_IFCHR: 369 sc->sc_dkdev.dk_copenmask |= pmask; 370 break; 371 372 case S_IFBLK: 373 sc->sc_dkdev.dk_bopenmask |= pmask; 374 break; 375 } 376 sc->sc_dkdev.dk_openmask = 377 sc->sc_dkdev.dk_copenmask | sc->sc_dkdev.dk_bopenmask; 378 379 done: 380 vndunlock(sc); 381 return (error); 382 } 383 384 static int 385 vndclose(dev_t dev, int flags, int mode, struct lwp *l) 386 { 387 int unit = vndunit(dev); 388 struct vnd_softc *sc; 389 int error = 0, part; 390 391 #ifdef DEBUG 392 if (vnddebug & VDB_FOLLOW) 393 printf("vndclose(0x%x, 0x%x, 0x%x, %p)\n", dev, flags, mode, l); 394 #endif 395 sc = device_lookup(&vnd_cd, unit); 396 if (sc == NULL) 397 return ENXIO; 398 399 if ((error = vndlock(sc)) != 0) 400 return (error); 401 402 part = DISKPART(dev); 403 404 /* ...that much closer to allowing unconfiguration... */ 405 switch (mode) { 406 case S_IFCHR: 407 sc->sc_dkdev.dk_copenmask &= ~(1 << part); 408 break; 409 410 case S_IFBLK: 411 sc->sc_dkdev.dk_bopenmask &= ~(1 << part); 412 break; 413 } 414 sc->sc_dkdev.dk_openmask = 415 sc->sc_dkdev.dk_copenmask | sc->sc_dkdev.dk_bopenmask; 416 417 vndunlock(sc); 418 419 if ((sc->sc_flags & VNF_INITED) == 0) { 420 if ((error = vnd_destroy((struct device *)sc)) != 0) { 421 aprint_error("%s: unable to detach instance\n", 422 sc->sc_dev.dv_xname); 423 return error; 424 } 425 } 426 427 return (0); 428 } 429 430 /* 431 * Queue the request, and wakeup the kernel thread to handle it. 432 */ 433 static void 434 vndstrategy(struct buf *bp) 435 { 436 int unit = vndunit(bp->b_dev); 437 struct vnd_softc *vnd = 438 (struct vnd_softc *)device_lookup(&vnd_cd, unit); 439 struct disklabel *lp = vnd->sc_dkdev.dk_label; 440 daddr_t blkno; 441 int s = splbio(); 442 443 bp->b_resid = bp->b_bcount; 444 445 if ((vnd->sc_flags & VNF_INITED) == 0) { 446 bp->b_error = ENXIO; 447 bp->b_flags |= B_ERROR; 448 goto done; 449 } 450 451 /* 452 * The transfer must be a whole number of blocks. 453 */ 454 if ((bp->b_bcount % lp->d_secsize) != 0) { 455 bp->b_error = EINVAL; 456 bp->b_flags |= B_ERROR; 457 goto done; 458 } 459 460 /* 461 * check if we're read-only. 462 */ 463 if ((vnd->sc_flags & VNF_READONLY) && !(bp->b_flags & B_READ)) { 464 bp->b_error = EACCES; 465 bp->b_flags |= B_ERROR; 466 goto done; 467 } 468 469 /* 470 * Do bounds checking and adjust transfer. If there's an error, 471 * the bounds check will flag that for us. 472 */ 473 if (DISKPART(bp->b_dev) == RAW_PART) { 474 if (bounds_check_with_mediasize(bp, DEV_BSIZE, 475 vnd->sc_size) <= 0) 476 goto done; 477 } else { 478 if (bounds_check_with_label(&vnd->sc_dkdev, 479 bp, vnd->sc_flags & (VNF_WLABEL|VNF_LABELLING)) <= 0) 480 goto done; 481 } 482 483 /* If it's a nil transfer, wake up the top half now. */ 484 if (bp->b_bcount == 0) 485 goto done; 486 487 /* 488 * Put the block number in terms of the logical blocksize 489 * of the "device". 490 */ 491 492 blkno = bp->b_blkno / (lp->d_secsize / DEV_BSIZE); 493 494 /* 495 * Translate the partition-relative block number to an absolute. 496 */ 497 if (DISKPART(bp->b_dev) != RAW_PART) { 498 struct partition *pp; 499 500 pp = &vnd->sc_dkdev.dk_label->d_partitions[ 501 DISKPART(bp->b_dev)]; 502 blkno += pp->p_offset; 503 } 504 bp->b_rawblkno = blkno; 505 506 #ifdef DEBUG 507 if (vnddebug & VDB_FOLLOW) 508 printf("vndstrategy(%p): unit %d\n", bp, unit); 509 #endif 510 BUFQ_PUT(vnd->sc_tab, bp); 511 wakeup(&vnd->sc_tab); 512 splx(s); 513 return; 514 done: 515 biodone(bp); 516 splx(s); 517 } 518 519 static void 520 vndthread(void *arg) 521 { 522 struct vnd_softc *vnd = arg; 523 struct mount *mp; 524 int s, bsize; 525 int sz, error; 526 struct disklabel *lp; 527 528 s = splbio(); 529 vnd->sc_flags |= VNF_KTHREAD; 530 wakeup(&vnd->sc_kthread); 531 532 /* 533 * Dequeue requests, break them into bsize pieces and submit using 534 * VOP_BMAP/VOP_STRATEGY. 535 */ 536 while ((vnd->sc_flags & VNF_VUNCONF) == 0) { 537 struct vndxfer *vnx; 538 off_t offset; 539 int resid; 540 int skipped = 0; 541 off_t bn; 542 int flags; 543 struct buf *obp; 544 struct buf *bp; 545 546 obp = BUFQ_GET(vnd->sc_tab); 547 if (obp == NULL) { 548 tsleep(&vnd->sc_tab, PRIBIO, "vndbp", 0); 549 continue; 550 }; 551 splx(s); 552 flags = obp->b_flags; 553 #ifdef DEBUG 554 if (vnddebug & VDB_FOLLOW) 555 printf("vndthread(%p\n", obp); 556 #endif 557 lp = vnd->sc_dkdev.dk_label; 558 559 /* convert to a byte offset within the file. */ 560 bn = obp->b_rawblkno * lp->d_secsize; 561 562 if (vnd->sc_vp->v_mount == NULL) { 563 obp->b_error = ENXIO; 564 obp->b_flags |= B_ERROR; 565 goto done; 566 } 567 #ifdef VND_COMPRESSION 568 /* handle a compressed read */ 569 if ((flags & B_READ) != 0 && (vnd->sc_flags & VNF_COMP)) { 570 compstrategy(obp, bn); 571 goto done; 572 } 573 #endif /* VND_COMPRESSION */ 574 575 bsize = vnd->sc_vp->v_mount->mnt_stat.f_iosize; 576 577 /* 578 * Allocate a header for this transfer and link it to the 579 * buffer 580 */ 581 s = splbio(); 582 vnx = VND_GETXFER(vnd); 583 splx(s); 584 vnx->vx_vnd = vnd; 585 586 bp = &vnx->vx_buf; 587 BUF_INIT(bp); 588 bp->b_flags = (obp->b_flags & B_READ) | B_CALL; 589 bp->b_iodone = vndiodone; 590 bp->b_private = obp; 591 bp->b_vp = vnd->sc_vp; 592 bp->b_data = obp->b_data; 593 bp->b_bcount = bp->b_resid = obp->b_bcount; 594 BIO_COPYPRIO(bp, obp); 595 596 s = splbio(); 597 while (vnd->sc_active >= vnd->sc_maxactive) { 598 tsleep(&vnd->sc_tab, PRIBIO, "vndac", 0); 599 } 600 vnd->sc_active++; 601 splx(s); 602 603 if ((flags & B_READ) == 0) { 604 s = splbio(); 605 V_INCR_NUMOUTPUT(bp->b_vp); 606 splx(s); 607 608 vn_start_write(vnd->sc_vp, &mp, V_WAIT); 609 } 610 611 /* Instrumentation. */ 612 disk_busy(&vnd->sc_dkdev); 613 614 /* 615 * Feed requests sequentially. 616 * We do it this way to keep from flooding NFS servers if we 617 * are connected to an NFS file. This places the burden on 618 * the client rather than the server. 619 */ 620 error = 0; 621 for (offset = 0, resid = bp->b_resid; resid; 622 resid -= sz, offset += sz) { 623 struct buf *nbp; 624 struct vnode *vp; 625 daddr_t nbn; 626 int off, nra; 627 628 nra = 0; 629 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY | LK_CANRECURSE); 630 error = VOP_BMAP(vnd->sc_vp, bn / bsize, &vp, &nbn, &nra); 631 VOP_UNLOCK(vnd->sc_vp, 0); 632 633 if (error == 0 && (long)nbn == -1) 634 error = EIO; 635 636 /* 637 * If there was an error or a hole in the file...punt. 638 * Note that we may have to wait for any operations 639 * that we have already fired off before releasing 640 * the buffer. 641 * 642 * XXX we could deal with holes here but it would be 643 * a hassle (in the write case). 644 */ 645 if (error) { 646 skipped += resid; 647 break; 648 } 649 650 #ifdef DEBUG 651 if (!dovndcluster) 652 nra = 0; 653 #endif 654 655 off = bn % bsize; 656 sz = MIN(((off_t)1 + nra) * bsize - off, resid); 657 #ifdef DEBUG 658 if (vnddebug & VDB_IO) 659 printf("vndstrategy: vp %p/%p bn 0x%qx/0x%" PRIx64 660 " sz 0x%x\n", 661 vnd->sc_vp, vp, (long long)bn, nbn, sz); 662 #endif 663 664 nbp = getiobuf(); 665 nestiobuf_setup(bp, nbp, offset, sz); 666 nbp->b_blkno = nbn + btodb(off); 667 668 #if 0 /* XXX #ifdef DEBUG */ 669 if (vnddebug & VDB_IO) 670 printf("vndstart(%ld): bp %p vp %p blkno " 671 "0x%" PRIx64 " flags %x addr %p cnt 0x%x\n", 672 (long) (vnd-vnd_softc), &nbp->vb_buf, 673 nbp->vb_buf.b_vp, nbp->vb_buf.b_blkno, 674 nbp->vb_buf.b_flags, nbp->vb_buf.b_data, 675 nbp->vb_buf.b_bcount); 676 #endif 677 VOP_STRATEGY(vp, nbp); 678 bn += sz; 679 } 680 nestiobuf_done(bp, skipped, error); 681 682 if ((flags & B_READ) == 0) 683 vn_finished_write(mp, 0); 684 685 s = splbio(); 686 continue; 687 done: 688 biodone(obp); 689 s = splbio(); 690 } 691 692 vnd->sc_flags &= (~VNF_KTHREAD | VNF_VUNCONF); 693 wakeup(&vnd->sc_kthread); 694 splx(s); 695 kthread_exit(0); 696 } 697 698 static void 699 vndiodone(struct buf *bp) 700 { 701 struct vndxfer *vnx = VND_BUFTOXFER(bp); 702 struct vnd_softc *vnd = vnx->vx_vnd; 703 struct buf *obp = bp->b_private; 704 705 KASSERT(&vnx->vx_buf == bp); 706 KASSERT(vnd->sc_active > 0); 707 #ifdef DEBUG 708 if (vnddebug & VDB_IO) { 709 printf("vndiodone1: bp %p iodone: error %d\n", 710 bp, (bp->b_flags & B_ERROR) != 0 ? bp->b_error : 0); 711 } 712 #endif 713 disk_unbusy(&vnd->sc_dkdev, bp->b_bcount - bp->b_resid, 714 (bp->b_flags & B_READ)); 715 vnd->sc_active--; 716 if (vnd->sc_active == 0) { 717 wakeup(&vnd->sc_tab); 718 } 719 obp->b_flags |= bp->b_flags & B_ERROR; 720 obp->b_error = bp->b_error; 721 obp->b_resid = bp->b_resid; 722 VND_PUTXFER(vnd, vnx); 723 biodone(obp); 724 } 725 726 /* ARGSUSED */ 727 static int 728 vndread(dev_t dev, struct uio *uio, int flags) 729 { 730 int unit = vndunit(dev); 731 struct vnd_softc *sc; 732 733 #ifdef DEBUG 734 if (vnddebug & VDB_FOLLOW) 735 printf("vndread(0x%x, %p)\n", dev, uio); 736 #endif 737 738 sc = device_lookup(&vnd_cd, unit); 739 if (sc == NULL) 740 return ENXIO; 741 742 if ((sc->sc_flags & VNF_INITED) == 0) 743 return (ENXIO); 744 745 return (physio(vndstrategy, NULL, dev, B_READ, minphys, uio)); 746 } 747 748 /* ARGSUSED */ 749 static int 750 vndwrite(dev_t dev, struct uio *uio, int flags) 751 { 752 int unit = vndunit(dev); 753 struct vnd_softc *sc; 754 755 #ifdef DEBUG 756 if (vnddebug & VDB_FOLLOW) 757 printf("vndwrite(0x%x, %p)\n", dev, uio); 758 #endif 759 760 sc = device_lookup(&vnd_cd, unit); 761 if (sc == NULL) 762 return ENXIO; 763 764 if ((sc->sc_flags & VNF_INITED) == 0) 765 return (ENXIO); 766 767 return (physio(vndstrategy, NULL, dev, B_WRITE, minphys, uio)); 768 } 769 770 static int 771 vnd_cget(struct lwp *l, int unit, int *un, struct vattr *va) 772 { 773 struct vnd_softc *vnd; 774 775 if (*un == -1) 776 *un = unit; 777 if (*un < 0) 778 return EINVAL; 779 780 vnd = device_lookup(&vnd_cd, *un); 781 if (vnd == NULL) 782 return (*un >= vnd_cd.cd_ndevs) ? ENXIO : -1; 783 784 if ((vnd->sc_flags & VNF_INITED) == 0) 785 return -1; 786 787 return VOP_GETATTR(vnd->sc_vp, va, l->l_proc->p_ucred, l); 788 } 789 790 /* ARGSUSED */ 791 static int 792 vndioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct lwp *l) 793 { 794 int unit = vndunit(dev); 795 struct vnd_softc *vnd; 796 struct vnd_ioctl *vio; 797 struct vattr vattr; 798 struct nameidata nd; 799 int error, part, pmask; 800 size_t geomsize; 801 struct proc *p = (l != NULL) ? l->l_proc : NULL; 802 int fflags; 803 #ifdef __HAVE_OLD_DISKLABEL 804 struct disklabel newlabel; 805 #endif 806 807 #ifdef DEBUG 808 if (vnddebug & VDB_FOLLOW) 809 printf("vndioctl(0x%x, 0x%lx, %p, 0x%x, %p): unit %d\n", 810 dev, cmd, data, flag, p, unit); 811 #endif 812 vnd = device_lookup(&vnd_cd, unit); 813 if (vnd == NULL && 814 #ifdef COMPAT_30 815 cmd != VNDIOOCGET && 816 #endif 817 cmd != VNDIOCGET) 818 return ENXIO; 819 vio = (struct vnd_ioctl *)data; 820 821 /* Must be open for writes for these commands... */ 822 switch (cmd) { 823 case VNDIOCSET: 824 case VNDIOCCLR: 825 case DIOCSDINFO: 826 case DIOCWDINFO: 827 #ifdef __HAVE_OLD_DISKLABEL 828 case ODIOCSDINFO: 829 case ODIOCWDINFO: 830 #endif 831 case DIOCKLABEL: 832 case DIOCWLABEL: 833 if ((flag & FWRITE) == 0) 834 return (EBADF); 835 } 836 837 /* Must be initialized for these... */ 838 switch (cmd) { 839 case VNDIOCCLR: 840 case DIOCGDINFO: 841 case DIOCSDINFO: 842 case DIOCWDINFO: 843 case DIOCGPART: 844 case DIOCKLABEL: 845 case DIOCWLABEL: 846 case DIOCGDEFLABEL: 847 #ifdef __HAVE_OLD_DISKLABEL 848 case ODIOCGDINFO: 849 case ODIOCSDINFO: 850 case ODIOCWDINFO: 851 case ODIOCGDEFLABEL: 852 #endif 853 if ((vnd->sc_flags & VNF_INITED) == 0) 854 return (ENXIO); 855 } 856 857 switch (cmd) { 858 case VNDIOCSET: 859 if (vnd->sc_flags & VNF_INITED) 860 return (EBUSY); 861 862 if ((error = vndlock(vnd)) != 0) 863 return (error); 864 865 fflags = FREAD; 866 if ((vio->vnd_flags & VNDIOF_READONLY) == 0) 867 fflags |= FWRITE; 868 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, vio->vnd_file, l); 869 if ((error = vn_open(&nd, fflags, 0)) != 0) 870 goto unlock_and_exit; 871 error = VOP_GETATTR(nd.ni_vp, &vattr, l->l_proc->p_ucred, l); 872 if (!error && nd.ni_vp->v_type != VREG) 873 error = EOPNOTSUPP; 874 if (error) { 875 VOP_UNLOCK(nd.ni_vp, 0); 876 goto close_and_exit; 877 } 878 879 /* If using a compressed file, initialize its info */ 880 /* (or abort with an error if kernel has no compression) */ 881 if (vio->vnd_flags & VNF_COMP) { 882 #ifdef VND_COMPRESSION 883 struct vnd_comp_header *ch; 884 int i; 885 u_int32_t comp_size; 886 u_int32_t comp_maxsize; 887 888 /* allocate space for compresed file header */ 889 ch = malloc(sizeof(struct vnd_comp_header), 890 M_TEMP, M_WAITOK); 891 892 /* read compressed file header */ 893 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)ch, 894 sizeof(struct vnd_comp_header), 0, UIO_SYSSPACE, 895 IO_UNIT|IO_NODELOCKED, p->p_ucred, NULL, NULL); 896 if(error) { 897 free(ch, M_TEMP); 898 VOP_UNLOCK(nd.ni_vp, 0); 899 goto close_and_exit; 900 } 901 902 /* save some header info */ 903 vnd->sc_comp_blksz = ntohl(ch->block_size); 904 /* note last offset is the file byte size */ 905 vnd->sc_comp_numoffs = ntohl(ch->num_blocks)+1; 906 free(ch, M_TEMP); 907 if(vnd->sc_comp_blksz % DEV_BSIZE !=0) { 908 VOP_UNLOCK(nd.ni_vp, 0); 909 error = EINVAL; 910 goto close_and_exit; 911 } 912 if(sizeof(struct vnd_comp_header) + 913 sizeof(u_int64_t) * vnd->sc_comp_numoffs > 914 vattr.va_size) { 915 VOP_UNLOCK(nd.ni_vp, 0); 916 error = EINVAL; 917 goto close_and_exit; 918 } 919 920 /* set decompressed file size */ 921 vattr.va_size = 922 (vnd->sc_comp_numoffs - 1) * vnd->sc_comp_blksz; 923 924 /* allocate space for all the compressed offsets */ 925 vnd->sc_comp_offsets = 926 malloc(sizeof(u_int64_t) * vnd->sc_comp_numoffs, 927 M_DEVBUF, M_WAITOK); 928 929 /* read in the offsets */ 930 error = vn_rdwr(UIO_READ, nd.ni_vp, 931 (caddr_t)vnd->sc_comp_offsets, 932 sizeof(u_int64_t) * vnd->sc_comp_numoffs, 933 sizeof(struct vnd_comp_header), UIO_SYSSPACE, 934 IO_UNIT|IO_NODELOCKED, p->p_ucred, NULL, NULL); 935 if(error) { 936 VOP_UNLOCK(nd.ni_vp, 0); 937 goto close_and_exit; 938 } 939 /* 940 * find largest block size (used for allocation limit). 941 * Also convert offset to native byte order. 942 */ 943 comp_maxsize = 0; 944 for (i = 0; i < vnd->sc_comp_numoffs - 1; i++) { 945 vnd->sc_comp_offsets[i] = 946 be64toh(vnd->sc_comp_offsets[i]); 947 comp_size = be64toh(vnd->sc_comp_offsets[i + 1]) 948 - vnd->sc_comp_offsets[i]; 949 if (comp_size > comp_maxsize) 950 comp_maxsize = comp_size; 951 } 952 vnd->sc_comp_offsets[vnd->sc_comp_numoffs - 1] = 953 be64toh(vnd->sc_comp_offsets[vnd->sc_comp_numoffs - 1]); 954 955 /* create compressed data buffer */ 956 vnd->sc_comp_buff = malloc(comp_maxsize, 957 M_DEVBUF, M_WAITOK); 958 959 /* create decompressed buffer */ 960 vnd->sc_comp_decombuf = malloc(vnd->sc_comp_blksz, 961 M_DEVBUF, M_WAITOK); 962 vnd->sc_comp_buffblk = -1; 963 964 /* Initialize decompress stream */ 965 bzero(&vnd->sc_comp_stream, sizeof(z_stream)); 966 vnd->sc_comp_stream.zalloc = vnd_alloc; 967 vnd->sc_comp_stream.zfree = vnd_free; 968 error = inflateInit2(&vnd->sc_comp_stream, MAX_WBITS); 969 if(error) { 970 if(vnd->sc_comp_stream.msg) 971 printf("vnd%d: compressed file, %s\n", 972 unit, vnd->sc_comp_stream.msg); 973 VOP_UNLOCK(nd.ni_vp, 0); 974 error = EINVAL; 975 goto close_and_exit; 976 } 977 978 vnd->sc_flags |= VNF_COMP | VNF_READONLY; 979 #else /* !VND_COMPRESSION */ 980 VOP_UNLOCK(nd.ni_vp, 0); 981 error = EOPNOTSUPP; 982 goto close_and_exit; 983 #endif /* VND_COMPRESSION */ 984 } 985 986 VOP_UNLOCK(nd.ni_vp, 0); 987 vnd->sc_vp = nd.ni_vp; 988 vnd->sc_size = btodb(vattr.va_size); /* note truncation */ 989 990 /* 991 * Use pseudo-geometry specified. If none was provided, 992 * use "standard" Adaptec fictitious geometry. 993 */ 994 if (vio->vnd_flags & VNDIOF_HASGEOM) { 995 996 memcpy(&vnd->sc_geom, &vio->vnd_geom, 997 sizeof(vio->vnd_geom)); 998 999 /* 1000 * Sanity-check the sector size. 1001 * XXX Don't allow secsize < DEV_BSIZE. Should 1002 * XXX we? 1003 */ 1004 if (vnd->sc_geom.vng_secsize < DEV_BSIZE || 1005 (vnd->sc_geom.vng_secsize % DEV_BSIZE) != 0 || 1006 vnd->sc_geom.vng_ncylinders == 0 || 1007 (vnd->sc_geom.vng_ntracks * 1008 vnd->sc_geom.vng_nsectors) == 0) { 1009 error = EINVAL; 1010 goto close_and_exit; 1011 } 1012 1013 /* 1014 * Compute the size (in DEV_BSIZE blocks) specified 1015 * by the geometry. 1016 */ 1017 geomsize = (vnd->sc_geom.vng_nsectors * 1018 vnd->sc_geom.vng_ntracks * 1019 vnd->sc_geom.vng_ncylinders) * 1020 (vnd->sc_geom.vng_secsize / DEV_BSIZE); 1021 1022 /* 1023 * Sanity-check the size against the specified 1024 * geometry. 1025 */ 1026 if (vnd->sc_size < geomsize) { 1027 error = EINVAL; 1028 goto close_and_exit; 1029 } 1030 } else if (vnd->sc_size >= (32 * 64)) { 1031 /* 1032 * Size must be at least 2048 DEV_BSIZE blocks 1033 * (1M) in order to use this geometry. 1034 */ 1035 vnd->sc_geom.vng_secsize = DEV_BSIZE; 1036 vnd->sc_geom.vng_nsectors = 32; 1037 vnd->sc_geom.vng_ntracks = 64; 1038 vnd->sc_geom.vng_ncylinders = vnd->sc_size / (64 * 32); 1039 } else { 1040 vnd->sc_geom.vng_secsize = DEV_BSIZE; 1041 vnd->sc_geom.vng_nsectors = 1; 1042 vnd->sc_geom.vng_ntracks = 1; 1043 vnd->sc_geom.vng_ncylinders = vnd->sc_size; 1044 } 1045 1046 if (vio->vnd_flags & VNDIOF_READONLY) { 1047 vnd->sc_flags |= VNF_READONLY; 1048 } 1049 1050 if ((error = vndsetcred(vnd, p->p_ucred)) != 0) 1051 goto close_and_exit; 1052 1053 vndthrottle(vnd, vnd->sc_vp); 1054 vio->vnd_size = dbtob(vnd->sc_size); 1055 vnd->sc_flags |= VNF_INITED; 1056 1057 /* create the kernel thread, wait for it to be up */ 1058 error = kthread_create1(vndthread, vnd, &vnd->sc_kthread, 1059 vnd->sc_dev.dv_xname); 1060 if (error) 1061 goto close_and_exit; 1062 while ((vnd->sc_flags & VNF_KTHREAD) == 0) { 1063 tsleep(&vnd->sc_kthread, PRIBIO, "vndthr", 0); 1064 } 1065 #ifdef DEBUG 1066 if (vnddebug & VDB_INIT) 1067 printf("vndioctl: SET vp %p size 0x%lx %d/%d/%d/%d\n", 1068 vnd->sc_vp, (unsigned long) vnd->sc_size, 1069 vnd->sc_geom.vng_secsize, 1070 vnd->sc_geom.vng_nsectors, 1071 vnd->sc_geom.vng_ntracks, 1072 vnd->sc_geom.vng_ncylinders); 1073 #endif 1074 1075 /* Attach the disk. */ 1076 vnd->sc_dkdev.dk_name = vnd->sc_dev.dv_xname; 1077 pseudo_disk_attach(&vnd->sc_dkdev); 1078 1079 /* Initialize the xfer and buffer pools. */ 1080 pool_init(&vnd->sc_vxpool, sizeof(struct vndxfer), 0, 1081 0, 0, "vndxpl", NULL); 1082 1083 /* Try and read the disklabel. */ 1084 vndgetdisklabel(dev, vnd); 1085 1086 vndunlock(vnd); 1087 1088 break; 1089 1090 close_and_exit: 1091 (void) vn_close(nd.ni_vp, fflags, p->p_ucred, l); 1092 unlock_and_exit: 1093 #ifdef VND_COMPRESSION 1094 /* free any allocated memory (for compressed file) */ 1095 if(vnd->sc_comp_offsets) { 1096 free(vnd->sc_comp_offsets, M_DEVBUF); 1097 vnd->sc_comp_offsets = NULL; 1098 } 1099 if(vnd->sc_comp_buff) { 1100 free(vnd->sc_comp_buff, M_DEVBUF); 1101 vnd->sc_comp_buff = NULL; 1102 } 1103 if(vnd->sc_comp_decombuf) { 1104 free(vnd->sc_comp_decombuf, M_DEVBUF); 1105 vnd->sc_comp_decombuf = NULL; 1106 } 1107 #endif /* VND_COMPRESSION */ 1108 vndunlock(vnd); 1109 return (error); 1110 1111 case VNDIOCCLR: 1112 if ((error = vndlock(vnd)) != 0) 1113 return (error); 1114 1115 /* 1116 * Don't unconfigure if any other partitions are open 1117 * or if both the character and block flavors of this 1118 * partition are open. 1119 */ 1120 part = DISKPART(dev); 1121 pmask = (1 << part); 1122 if (((vnd->sc_dkdev.dk_openmask & ~pmask) || 1123 ((vnd->sc_dkdev.dk_bopenmask & pmask) && 1124 (vnd->sc_dkdev.dk_copenmask & pmask))) && 1125 !(vio->vnd_flags & VNDIOF_FORCE)) { 1126 vndunlock(vnd); 1127 return (EBUSY); 1128 } 1129 1130 /* 1131 * XXX vndclear() might call vndclose() implicitely; 1132 * release lock to avoid recursion 1133 */ 1134 vndunlock(vnd); 1135 vndclear(vnd, minor(dev)); 1136 #ifdef DEBUG 1137 if (vnddebug & VDB_INIT) 1138 printf("vndioctl: CLRed\n"); 1139 #endif 1140 1141 /* Destroy the xfer and buffer pools. */ 1142 pool_destroy(&vnd->sc_vxpool); 1143 1144 /* Detatch the disk. */ 1145 pseudo_disk_detach(&vnd->sc_dkdev); 1146 break; 1147 1148 #ifdef COMPAT_30 1149 case VNDIOOCGET: { 1150 struct vnd_ouser *vnu; 1151 struct vattr va; 1152 vnu = (struct vnd_ouser *)data; 1153 switch (error = vnd_cget(l, unit, &vnu->vnu_unit, &va)) { 1154 case 0: 1155 vnu->vnu_dev = va.va_fsid; 1156 vnu->vnu_ino = va.va_fileid; 1157 break; 1158 case -1: 1159 /* unused is not an error */ 1160 vnu->vnu_dev = 0; 1161 vnu->vnu_ino = 0; 1162 break; 1163 default: 1164 return error; 1165 } 1166 break; 1167 } 1168 #endif 1169 case VNDIOCGET: { 1170 struct vnd_user *vnu; 1171 struct vattr va; 1172 vnu = (struct vnd_user *)data; 1173 switch (error = vnd_cget(l, unit, &vnu->vnu_unit, &va)) { 1174 case 0: 1175 vnu->vnu_dev = va.va_fsid; 1176 vnu->vnu_ino = va.va_fileid; 1177 break; 1178 case -1: 1179 /* unused is not an error */ 1180 vnu->vnu_dev = 0; 1181 vnu->vnu_ino = 0; 1182 break; 1183 default: 1184 return error; 1185 } 1186 break; 1187 } 1188 1189 case DIOCGDINFO: 1190 *(struct disklabel *)data = *(vnd->sc_dkdev.dk_label); 1191 break; 1192 1193 #ifdef __HAVE_OLD_DISKLABEL 1194 case ODIOCGDINFO: 1195 newlabel = *(vnd->sc_dkdev.dk_label); 1196 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 1197 return ENOTTY; 1198 memcpy(data, &newlabel, sizeof (struct olddisklabel)); 1199 break; 1200 #endif 1201 1202 case DIOCGPART: 1203 ((struct partinfo *)data)->disklab = vnd->sc_dkdev.dk_label; 1204 ((struct partinfo *)data)->part = 1205 &vnd->sc_dkdev.dk_label->d_partitions[DISKPART(dev)]; 1206 break; 1207 1208 case DIOCWDINFO: 1209 case DIOCSDINFO: 1210 #ifdef __HAVE_OLD_DISKLABEL 1211 case ODIOCWDINFO: 1212 case ODIOCSDINFO: 1213 #endif 1214 { 1215 struct disklabel *lp; 1216 1217 if ((error = vndlock(vnd)) != 0) 1218 return (error); 1219 1220 vnd->sc_flags |= VNF_LABELLING; 1221 1222 #ifdef __HAVE_OLD_DISKLABEL 1223 if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) { 1224 memset(&newlabel, 0, sizeof newlabel); 1225 memcpy(&newlabel, data, sizeof (struct olddisklabel)); 1226 lp = &newlabel; 1227 } else 1228 #endif 1229 lp = (struct disklabel *)data; 1230 1231 error = setdisklabel(vnd->sc_dkdev.dk_label, 1232 lp, 0, vnd->sc_dkdev.dk_cpulabel); 1233 if (error == 0) { 1234 if (cmd == DIOCWDINFO 1235 #ifdef __HAVE_OLD_DISKLABEL 1236 || cmd == ODIOCWDINFO 1237 #endif 1238 ) 1239 error = writedisklabel(VNDLABELDEV(dev), 1240 vndstrategy, vnd->sc_dkdev.dk_label, 1241 vnd->sc_dkdev.dk_cpulabel); 1242 } 1243 1244 vnd->sc_flags &= ~VNF_LABELLING; 1245 1246 vndunlock(vnd); 1247 1248 if (error) 1249 return (error); 1250 break; 1251 } 1252 1253 case DIOCKLABEL: 1254 if (*(int *)data != 0) 1255 vnd->sc_flags |= VNF_KLABEL; 1256 else 1257 vnd->sc_flags &= ~VNF_KLABEL; 1258 break; 1259 1260 case DIOCWLABEL: 1261 if (*(int *)data != 0) 1262 vnd->sc_flags |= VNF_WLABEL; 1263 else 1264 vnd->sc_flags &= ~VNF_WLABEL; 1265 break; 1266 1267 case DIOCGDEFLABEL: 1268 vndgetdefaultlabel(vnd, (struct disklabel *)data); 1269 break; 1270 1271 #ifdef __HAVE_OLD_DISKLABEL 1272 case ODIOCGDEFLABEL: 1273 vndgetdefaultlabel(vnd, &newlabel); 1274 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 1275 return ENOTTY; 1276 memcpy(data, &newlabel, sizeof (struct olddisklabel)); 1277 break; 1278 #endif 1279 1280 default: 1281 return (ENOTTY); 1282 } 1283 1284 return (0); 1285 } 1286 1287 /* 1288 * Duplicate the current processes' credentials. Since we are called only 1289 * as the result of a SET ioctl and only root can do that, any future access 1290 * to this "disk" is essentially as root. Note that credentials may change 1291 * if some other uid can write directly to the mapped file (NFS). 1292 */ 1293 static int 1294 vndsetcred(struct vnd_softc *vnd, struct ucred *cred) 1295 { 1296 struct uio auio; 1297 struct iovec aiov; 1298 char *tmpbuf; 1299 int error; 1300 1301 vnd->sc_cred = crdup(cred); 1302 tmpbuf = malloc(DEV_BSIZE, M_TEMP, M_WAITOK); 1303 1304 /* XXX: Horrible kludge to establish credentials for NFS */ 1305 aiov.iov_base = tmpbuf; 1306 aiov.iov_len = min(DEV_BSIZE, dbtob(vnd->sc_size)); 1307 auio.uio_iov = &aiov; 1308 auio.uio_iovcnt = 1; 1309 auio.uio_offset = 0; 1310 auio.uio_rw = UIO_READ; 1311 auio.uio_segflg = UIO_SYSSPACE; 1312 auio.uio_resid = aiov.iov_len; 1313 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 1314 error = VOP_READ(vnd->sc_vp, &auio, 0, vnd->sc_cred); 1315 if (error == 0) { 1316 /* 1317 * Because vnd does all IO directly through the vnode 1318 * we need to flush (at least) the buffer from the above 1319 * VOP_READ from the buffer cache to prevent cache 1320 * incoherencies. Also, be careful to write dirty 1321 * buffers back to stable storage. 1322 */ 1323 error = vinvalbuf(vnd->sc_vp, V_SAVE, vnd->sc_cred, 1324 curlwp, 0, 0); 1325 } 1326 VOP_UNLOCK(vnd->sc_vp, 0); 1327 1328 free(tmpbuf, M_TEMP); 1329 return (error); 1330 } 1331 1332 /* 1333 * Set maxactive based on FS type 1334 */ 1335 static void 1336 vndthrottle(struct vnd_softc *vnd, struct vnode *vp) 1337 { 1338 #ifdef NFS 1339 extern int (**nfsv2_vnodeop_p)(void *); 1340 1341 if (vp->v_op == nfsv2_vnodeop_p) 1342 vnd->sc_maxactive = 2; 1343 else 1344 #endif 1345 vnd->sc_maxactive = 8; 1346 1347 if (vnd->sc_maxactive < 1) 1348 vnd->sc_maxactive = 1; 1349 } 1350 1351 #if 0 1352 static void 1353 vndshutdown(void) 1354 { 1355 struct vnd_softc *vnd; 1356 1357 for (vnd = &vnd_softc[0]; vnd < &vnd_softc[numvnd]; vnd++) 1358 if (vnd->sc_flags & VNF_INITED) 1359 vndclear(vnd); 1360 } 1361 #endif 1362 1363 static void 1364 vndclear(struct vnd_softc *vnd, int myminor) 1365 { 1366 struct vnode *vp = vnd->sc_vp; 1367 struct lwp *l = curlwp; 1368 int fflags = FREAD; 1369 int bmaj, cmaj, i, mn; 1370 int s; 1371 1372 #ifdef DEBUG 1373 if (vnddebug & VDB_FOLLOW) 1374 printf("vndclear(%p): vp %p\n", vnd, vp); 1375 #endif 1376 /* locate the major number */ 1377 bmaj = bdevsw_lookup_major(&vnd_bdevsw); 1378 cmaj = cdevsw_lookup_major(&vnd_cdevsw); 1379 1380 /* Nuke the vnodes for any open instances */ 1381 for (i = 0; i < MAXPARTITIONS; i++) { 1382 mn = DISKMINOR(vnd->sc_dev.dv_unit, i); 1383 vdevgone(bmaj, mn, mn, VBLK); 1384 if (mn != myminor) /* XXX avoid to kill own vnode */ 1385 vdevgone(cmaj, mn, mn, VCHR); 1386 } 1387 1388 if ((vnd->sc_flags & VNF_READONLY) == 0) 1389 fflags |= FWRITE; 1390 1391 s = splbio(); 1392 bufq_drain(vnd->sc_tab); 1393 splx(s); 1394 1395 vnd->sc_flags |= VNF_VUNCONF; 1396 wakeup(&vnd->sc_tab); 1397 while (vnd->sc_flags & VNF_KTHREAD) 1398 tsleep(&vnd->sc_kthread, PRIBIO, "vnthr", 0); 1399 1400 #ifdef VND_COMPRESSION 1401 /* free the compressed file buffers */ 1402 if(vnd->sc_flags & VNF_COMP) { 1403 if(vnd->sc_comp_offsets) { 1404 free(vnd->sc_comp_offsets, M_DEVBUF); 1405 vnd->sc_comp_offsets = NULL; 1406 } 1407 if(vnd->sc_comp_buff) { 1408 free(vnd->sc_comp_buff, M_DEVBUF); 1409 vnd->sc_comp_buff = NULL; 1410 } 1411 if(vnd->sc_comp_decombuf) { 1412 free(vnd->sc_comp_decombuf, M_DEVBUF); 1413 vnd->sc_comp_decombuf = NULL; 1414 } 1415 } 1416 #endif /* VND_COMPRESSION */ 1417 vnd->sc_flags &= 1418 ~(VNF_INITED | VNF_READONLY | VNF_VLABEL 1419 | VNF_VUNCONF | VNF_COMP); 1420 if (vp == (struct vnode *)0) 1421 panic("vndclear: null vp"); 1422 (void) vn_close(vp, fflags, vnd->sc_cred, l); 1423 crfree(vnd->sc_cred); 1424 vnd->sc_vp = (struct vnode *)0; 1425 vnd->sc_cred = (struct ucred *)0; 1426 vnd->sc_size = 0; 1427 } 1428 1429 static int 1430 vndsize(dev_t dev) 1431 { 1432 struct vnd_softc *sc; 1433 struct disklabel *lp; 1434 int part, unit, omask; 1435 int size; 1436 1437 unit = vndunit(dev); 1438 sc = (struct vnd_softc *)device_lookup(&vnd_cd, unit); 1439 if (sc == NULL) 1440 return -1; 1441 1442 if ((sc->sc_flags & VNF_INITED) == 0) 1443 return (-1); 1444 1445 part = DISKPART(dev); 1446 omask = sc->sc_dkdev.dk_openmask & (1 << part); 1447 lp = sc->sc_dkdev.dk_label; 1448 1449 if (omask == 0 && vndopen(dev, 0, S_IFBLK, curlwp)) /* XXX */ 1450 return (-1); 1451 1452 if (lp->d_partitions[part].p_fstype != FS_SWAP) 1453 size = -1; 1454 else 1455 size = lp->d_partitions[part].p_size * 1456 (lp->d_secsize / DEV_BSIZE); 1457 1458 if (omask == 0 && vndclose(dev, 0, S_IFBLK, curlwp)) /* XXX */ 1459 return (-1); 1460 1461 return (size); 1462 } 1463 1464 static int 1465 vnddump(dev_t dev, daddr_t blkno, caddr_t va, size_t size) 1466 { 1467 1468 /* Not implemented. */ 1469 return ENXIO; 1470 } 1471 1472 static void 1473 vndgetdefaultlabel(struct vnd_softc *sc, struct disklabel *lp) 1474 { 1475 struct vndgeom *vng = &sc->sc_geom; 1476 struct partition *pp; 1477 1478 memset(lp, 0, sizeof(*lp)); 1479 1480 lp->d_secperunit = sc->sc_size / (vng->vng_secsize / DEV_BSIZE); 1481 lp->d_secsize = vng->vng_secsize; 1482 lp->d_nsectors = vng->vng_nsectors; 1483 lp->d_ntracks = vng->vng_ntracks; 1484 lp->d_ncylinders = vng->vng_ncylinders; 1485 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 1486 1487 strncpy(lp->d_typename, "vnd", sizeof(lp->d_typename)); 1488 lp->d_type = DTYPE_VND; 1489 strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname)); 1490 lp->d_rpm = 3600; 1491 lp->d_interleave = 1; 1492 lp->d_flags = 0; 1493 1494 pp = &lp->d_partitions[RAW_PART]; 1495 pp->p_offset = 0; 1496 pp->p_size = lp->d_secperunit; 1497 pp->p_fstype = FS_UNUSED; 1498 lp->d_npartitions = RAW_PART + 1; 1499 1500 lp->d_magic = DISKMAGIC; 1501 lp->d_magic2 = DISKMAGIC; 1502 lp->d_checksum = dkcksum(lp); 1503 } 1504 1505 /* 1506 * Read the disklabel from a vnd. If one is not present, create a fake one. 1507 */ 1508 static void 1509 vndgetdisklabel(dev_t dev, struct vnd_softc *sc) 1510 { 1511 const char *errstring; 1512 struct disklabel *lp = sc->sc_dkdev.dk_label; 1513 struct cpu_disklabel *clp = sc->sc_dkdev.dk_cpulabel; 1514 int i; 1515 1516 memset(clp, 0, sizeof(*clp)); 1517 1518 vndgetdefaultlabel(sc, lp); 1519 1520 /* 1521 * Call the generic disklabel extraction routine. 1522 */ 1523 errstring = readdisklabel(VNDLABELDEV(dev), vndstrategy, lp, clp); 1524 if (errstring) { 1525 /* 1526 * Lack of disklabel is common, but we print the warning 1527 * anyway, since it might contain other useful information. 1528 */ 1529 printf("%s: %s\n", sc->sc_dev.dv_xname, errstring); 1530 1531 /* 1532 * For historical reasons, if there's no disklabel 1533 * present, all partitions must be FS_BSDFFS and 1534 * occupy the entire disk. 1535 */ 1536 for (i = 0; i < MAXPARTITIONS; i++) { 1537 /* 1538 * Don't wipe out port specific hack (such as 1539 * dos partition hack of i386 port). 1540 */ 1541 if (lp->d_partitions[i].p_size != 0) 1542 continue; 1543 1544 lp->d_partitions[i].p_size = lp->d_secperunit; 1545 lp->d_partitions[i].p_offset = 0; 1546 lp->d_partitions[i].p_fstype = FS_BSDFFS; 1547 } 1548 1549 strncpy(lp->d_packname, "default label", 1550 sizeof(lp->d_packname)); 1551 1552 lp->d_npartitions = MAXPARTITIONS; 1553 lp->d_checksum = dkcksum(lp); 1554 } 1555 1556 /* In-core label now valid. */ 1557 sc->sc_flags |= VNF_VLABEL; 1558 } 1559 1560 /* 1561 * Wait interruptibly for an exclusive lock. 1562 * 1563 * XXX 1564 * Several drivers do this; it should be abstracted and made MP-safe. 1565 */ 1566 static int 1567 vndlock(struct vnd_softc *sc) 1568 { 1569 int error; 1570 1571 while ((sc->sc_flags & VNF_LOCKED) != 0) { 1572 sc->sc_flags |= VNF_WANTED; 1573 if ((error = tsleep(sc, PRIBIO | PCATCH, "vndlck", 0)) != 0) 1574 return (error); 1575 } 1576 sc->sc_flags |= VNF_LOCKED; 1577 return (0); 1578 } 1579 1580 /* 1581 * Unlock and wake up any waiters. 1582 */ 1583 static void 1584 vndunlock(struct vnd_softc *sc) 1585 { 1586 1587 sc->sc_flags &= ~VNF_LOCKED; 1588 if ((sc->sc_flags & VNF_WANTED) != 0) { 1589 sc->sc_flags &= ~VNF_WANTED; 1590 wakeup(sc); 1591 } 1592 } 1593 1594 #ifdef VND_COMPRESSION 1595 /* compressed file read */ 1596 static void 1597 compstrategy(struct buf *bp, off_t bn) 1598 { 1599 int error; 1600 int unit = vndunit(bp->b_dev); 1601 struct vnd_softc *vnd = 1602 (struct vnd_softc *)device_lookup(&vnd_cd, unit); 1603 u_int32_t comp_block; 1604 struct uio auio; 1605 caddr_t addr; 1606 int s; 1607 1608 /* set up constants for data move */ 1609 auio.uio_rw = UIO_READ; 1610 auio.uio_segflg = UIO_SYSSPACE; 1611 1612 /* read, and transfer the data */ 1613 addr = bp->b_data; 1614 s = splbio(); 1615 while (bp->b_resid > 0) { 1616 unsigned length; 1617 size_t length_in_buffer; 1618 u_int32_t offset_in_buffer; 1619 struct iovec aiov; 1620 1621 /* calculate the compressed block number */ 1622 comp_block = bn / (off_t)vnd->sc_comp_blksz; 1623 1624 /* check for good block number */ 1625 if (comp_block >= vnd->sc_comp_numoffs) { 1626 bp->b_error = EINVAL; 1627 bp->b_flags |= B_ERROR; 1628 splx(s); 1629 return; 1630 } 1631 1632 /* read in the compressed block, if not in buffer */ 1633 if (comp_block != vnd->sc_comp_buffblk) { 1634 length = vnd->sc_comp_offsets[comp_block + 1] - 1635 vnd->sc_comp_offsets[comp_block]; 1636 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 1637 error = vn_rdwr(UIO_READ, vnd->sc_vp, vnd->sc_comp_buff, 1638 length, vnd->sc_comp_offsets[comp_block], 1639 UIO_SYSSPACE, IO_UNIT, vnd->sc_cred, NULL, NULL); 1640 if (error) { 1641 bp->b_error = error; 1642 bp->b_flags |= B_ERROR; 1643 VOP_UNLOCK(vnd->sc_vp, 0); 1644 splx(s); 1645 return; 1646 } 1647 /* uncompress the buffer */ 1648 vnd->sc_comp_stream.next_in = vnd->sc_comp_buff; 1649 vnd->sc_comp_stream.avail_in = length; 1650 vnd->sc_comp_stream.next_out = vnd->sc_comp_decombuf; 1651 vnd->sc_comp_stream.avail_out = vnd->sc_comp_blksz; 1652 inflateReset(&vnd->sc_comp_stream); 1653 error = inflate(&vnd->sc_comp_stream, Z_FINISH); 1654 if (error != Z_STREAM_END) { 1655 if (vnd->sc_comp_stream.msg) 1656 printf("%s: compressed file, %s\n", 1657 vnd->sc_dev.dv_xname, 1658 vnd->sc_comp_stream.msg); 1659 bp->b_error = EBADMSG; 1660 bp->b_flags |= B_ERROR; 1661 VOP_UNLOCK(vnd->sc_vp, 0); 1662 splx(s); 1663 return; 1664 } 1665 vnd->sc_comp_buffblk = comp_block; 1666 VOP_UNLOCK(vnd->sc_vp, 0); 1667 } 1668 1669 /* transfer the usable uncompressed data */ 1670 offset_in_buffer = bn % (off_t)vnd->sc_comp_blksz; 1671 length_in_buffer = vnd->sc_comp_blksz - offset_in_buffer; 1672 if (length_in_buffer > bp->b_resid) 1673 length_in_buffer = bp->b_resid; 1674 auio.uio_iov = &aiov; 1675 auio.uio_iovcnt = 1; 1676 aiov.iov_base = addr; 1677 aiov.iov_len = length_in_buffer; 1678 auio.uio_resid = aiov.iov_len; 1679 auio.uio_offset = 0; 1680 error = uiomove(vnd->sc_comp_decombuf + offset_in_buffer, 1681 length_in_buffer, &auio); 1682 if (error) { 1683 bp->b_error = error; 1684 bp->b_flags |= B_ERROR; 1685 splx(s); 1686 return; 1687 } 1688 1689 bn += length_in_buffer; 1690 addr += length_in_buffer; 1691 bp->b_resid -= length_in_buffer; 1692 } 1693 splx(s); 1694 } 1695 1696 /* compression memory allocation routines */ 1697 static void * 1698 vnd_alloc(void *aux, u_int items, u_int siz) 1699 { 1700 return malloc(items * siz, M_TEMP, M_NOWAIT); 1701 } 1702 1703 static void 1704 vnd_free(void *aux, void *ptr) 1705 { 1706 free(ptr, M_TEMP); 1707 } 1708 #endif /* VND_COMPRESSION */ 1709