vnd.c revision 1.103
1 /* $NetBSD: vnd.c,v 1.103 2003/10/15 11:28:59 hannken 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 1.103 2003/10/15 11:28:59 hannken Exp $"); 137 138 #if defined(_KERNEL_OPT) 139 #include "fs_nfs.h" 140 #endif 141 142 #include <sys/param.h> 143 #include <sys/systm.h> 144 #include <sys/namei.h> 145 #include <sys/proc.h> 146 #include <sys/errno.h> 147 #include <sys/buf.h> 148 #include <sys/malloc.h> 149 #include <sys/ioctl.h> 150 #include <sys/disklabel.h> 151 #include <sys/device.h> 152 #include <sys/disk.h> 153 #include <sys/stat.h> 154 #include <sys/mount.h> 155 #include <sys/vnode.h> 156 #include <sys/file.h> 157 #include <sys/uio.h> 158 #include <sys/conf.h> 159 160 #include <miscfs/specfs/specdev.h> 161 162 #include <dev/vndvar.h> 163 164 #if defined(VNDDEBUG) && !defined(DEBUG) 165 #define DEBUG 166 #endif 167 168 #ifdef DEBUG 169 int dovndcluster = 1; 170 #define VDB_FOLLOW 0x01 171 #define VDB_INIT 0x02 172 #define VDB_IO 0x04 173 #define VDB_LABEL 0x08 174 int vnddebug = 0x00; 175 #endif 176 177 #define vndunit(x) DISKUNIT(x) 178 179 struct vndxfer { 180 struct buf *vx_bp; /* Pointer to parent buffer */ 181 int vx_error; 182 int vx_pending; /* # of pending aux buffers */ 183 int vx_flags; 184 #define VX_BUSY 1 185 }; 186 187 struct vndbuf { 188 struct buf vb_buf; 189 struct vndxfer *vb_xfer; 190 }; 191 192 #define VND_GETXFER(vnd) pool_get(&(vnd)->sc_vxpool, PR_NOWAIT) 193 #define VND_PUTXFER(vnd, vx) pool_put(&(vnd)->sc_vxpool, (vx)) 194 195 #define VND_GETBUF(vnd) pool_get(&(vnd)->sc_vbpool, PR_NOWAIT) 196 #define VND_PUTBUF(vnd, vb) pool_put(&(vnd)->sc_vbpool, (vb)) 197 198 struct vnd_softc *vnd_softc; 199 int numvnd = 0; 200 201 #define VNDLABELDEV(dev) \ 202 (MAKEDISKDEV(major((dev)), vndunit((dev)), RAW_PART)) 203 204 /* called by main() at boot time (XXX: and the LKM driver) */ 205 void vndattach __P((int)); 206 int vnddetach __P((void)); 207 208 void vndclear __P((struct vnd_softc *, int)); 209 void vndstart __P((struct vnd_softc *)); 210 int vndsetcred __P((struct vnd_softc *, struct ucred *)); 211 void vndthrottle __P((struct vnd_softc *, struct vnode *)); 212 void vndiodone __P((struct buf *)); 213 #if 0 214 void vndshutdown __P((void)); 215 #endif 216 217 void vndgetdefaultlabel __P((struct vnd_softc *, struct disklabel *)); 218 void vndgetdisklabel __P((dev_t)); 219 220 static int vndlock __P((struct vnd_softc *)); 221 static void vndunlock __P((struct vnd_softc *)); 222 223 dev_type_open(vndopen); 224 dev_type_close(vndclose); 225 dev_type_read(vndread); 226 dev_type_write(vndwrite); 227 dev_type_ioctl(vndioctl); 228 dev_type_strategy(vndstrategy); 229 dev_type_dump(vnddump); 230 dev_type_size(vndsize); 231 232 const struct bdevsw vnd_bdevsw = { 233 vndopen, vndclose, vndstrategy, vndioctl, vnddump, vndsize, D_DISK 234 }; 235 236 const struct cdevsw vnd_cdevsw = { 237 vndopen, vndclose, vndread, vndwrite, vndioctl, 238 nostop, notty, nopoll, nommap, nokqfilter, D_DISK 239 }; 240 241 int vndattached = 0; 242 243 void 244 vndattach(num) 245 int num; 246 { 247 int i; 248 char *mem; 249 250 if (vndattached) 251 return; 252 vndattached = 1; 253 if (num <= 0) 254 return; 255 i = num * sizeof(struct vnd_softc); 256 mem = malloc(i, M_DEVBUF, M_NOWAIT|M_ZERO); 257 if (mem == NULL) { 258 printf("WARNING: no memory for vnode disks\n"); 259 return; 260 } 261 vnd_softc = (struct vnd_softc *)mem; 262 numvnd = num; 263 264 for (i = 0; i < numvnd; i++) { 265 vnd_softc[i].sc_unit = i; 266 bufq_alloc(&vnd_softc[i].sc_tab, 267 BUFQ_DISKSORT|BUFQ_SORT_RAWBLOCK); 268 } 269 } 270 271 int 272 vnddetach() 273 { 274 int i; 275 276 /* First check we aren't in use. */ 277 for (i = 0; i < numvnd; i++) 278 if (vnd_softc[i].sc_flags & VNF_INITED) 279 return (EBUSY); 280 281 for (i = 0; i < numvnd; i++) 282 bufq_free(&vnd_softc[i].sc_tab); 283 284 free(vnd_softc, M_DEVBUF); 285 vndattached = 0; 286 287 return (0); 288 } 289 290 int 291 vndopen(dev, flags, mode, p) 292 dev_t dev; 293 int flags, mode; 294 struct proc *p; 295 { 296 int unit = vndunit(dev); 297 struct vnd_softc *sc; 298 int error = 0, part, pmask; 299 struct disklabel *lp; 300 301 #ifdef DEBUG 302 if (vnddebug & VDB_FOLLOW) 303 printf("vndopen(0x%x, 0x%x, 0x%x, %p)\n", dev, flags, mode, p); 304 #endif 305 if (unit >= numvnd) 306 return (ENXIO); 307 sc = &vnd_softc[unit]; 308 309 if ((error = vndlock(sc)) != 0) 310 return (error); 311 312 lp = sc->sc_dkdev.dk_label; 313 314 part = DISKPART(dev); 315 pmask = (1 << part); 316 317 /* 318 * If we're initialized, check to see if there are any other 319 * open partitions. If not, then it's safe to update the 320 * in-core disklabel. Only read the disklabel if it is 321 * not realdy valid. 322 */ 323 if ((sc->sc_flags & (VNF_INITED|VNF_VLABEL)) == VNF_INITED && 324 sc->sc_dkdev.dk_openmask == 0) 325 vndgetdisklabel(dev); 326 327 /* Check that the partitions exists. */ 328 if (part != RAW_PART) { 329 if (((sc->sc_flags & VNF_INITED) == 0) || 330 ((part >= lp->d_npartitions) || 331 (lp->d_partitions[part].p_fstype == FS_UNUSED))) { 332 error = ENXIO; 333 goto done; 334 } 335 } 336 337 /* Prevent our unit from being unconfigured while open. */ 338 switch (mode) { 339 case S_IFCHR: 340 sc->sc_dkdev.dk_copenmask |= pmask; 341 break; 342 343 case S_IFBLK: 344 sc->sc_dkdev.dk_bopenmask |= pmask; 345 break; 346 } 347 sc->sc_dkdev.dk_openmask = 348 sc->sc_dkdev.dk_copenmask | sc->sc_dkdev.dk_bopenmask; 349 350 done: 351 vndunlock(sc); 352 return (error); 353 } 354 355 int 356 vndclose(dev, flags, mode, p) 357 dev_t dev; 358 int flags, mode; 359 struct proc *p; 360 { 361 int unit = vndunit(dev); 362 struct vnd_softc *sc; 363 int error = 0, part; 364 365 #ifdef DEBUG 366 if (vnddebug & VDB_FOLLOW) 367 printf("vndclose(0x%x, 0x%x, 0x%x, %p)\n", dev, flags, mode, p); 368 #endif 369 370 if (unit >= numvnd) 371 return (ENXIO); 372 sc = &vnd_softc[unit]; 373 374 if ((error = vndlock(sc)) != 0) 375 return (error); 376 377 part = DISKPART(dev); 378 379 /* ...that much closer to allowing unconfiguration... */ 380 switch (mode) { 381 case S_IFCHR: 382 sc->sc_dkdev.dk_copenmask &= ~(1 << part); 383 break; 384 385 case S_IFBLK: 386 sc->sc_dkdev.dk_bopenmask &= ~(1 << part); 387 break; 388 } 389 sc->sc_dkdev.dk_openmask = 390 sc->sc_dkdev.dk_copenmask | sc->sc_dkdev.dk_bopenmask; 391 392 if (sc->sc_dkdev.dk_openmask == 0) { 393 if ((sc->sc_flags & VNF_KLABEL) == 0) 394 sc->sc_flags &= ~VNF_VLABEL; 395 } 396 397 vndunlock(sc); 398 return (0); 399 } 400 401 /* 402 * Break the request into bsize pieces and submit using VOP_BMAP/VOP_STRATEGY. 403 */ 404 void 405 vndstrategy(bp) 406 struct buf *bp; 407 { 408 int unit = vndunit(bp->b_dev); 409 struct vnd_softc *vnd = &vnd_softc[unit]; 410 struct vndxfer *vnx; 411 struct mount *mp; 412 int s, bsize, resid; 413 off_t bn; 414 caddr_t addr; 415 int sz, flags, error, wlabel; 416 struct disklabel *lp; 417 struct partition *pp; 418 419 #ifdef DEBUG 420 if (vnddebug & VDB_FOLLOW) 421 printf("vndstrategy(%p): unit %d\n", bp, unit); 422 #endif 423 if ((vnd->sc_flags & VNF_INITED) == 0) { 424 bp->b_error = ENXIO; 425 bp->b_flags |= B_ERROR; 426 goto done; 427 } 428 429 /* If it's a nil transfer, wake up the top half now. */ 430 if (bp->b_bcount == 0) 431 goto done; 432 433 lp = vnd->sc_dkdev.dk_label; 434 435 /* 436 * The transfer must be a whole number of blocks. 437 */ 438 if ((bp->b_bcount % lp->d_secsize) != 0) { 439 bp->b_error = EINVAL; 440 bp->b_flags |= B_ERROR; 441 goto done; 442 } 443 444 /* 445 * Do bounds checking and adjust transfer. If there's an error, 446 * the bounds check will flag that for us. 447 */ 448 wlabel = vnd->sc_flags & (VNF_WLABEL|VNF_LABELLING); 449 if (DISKPART(bp->b_dev) != RAW_PART) 450 if (bounds_check_with_label(&vnd->sc_dkdev, bp, wlabel) <= 0) 451 goto done; 452 453 /* 454 * check if we're read-only. 455 */ 456 if ((vnd->sc_flags & VNF_READONLY) && !(bp->b_flags & B_READ)) { 457 bp->b_error = EACCES; 458 bp->b_flags |= B_ERROR; 459 goto done; 460 } 461 462 bp->b_resid = bp->b_bcount; 463 464 /* 465 * Put the block number in terms of the logical blocksize 466 * of the "device". 467 */ 468 bn = bp->b_blkno / (lp->d_secsize / DEV_BSIZE); 469 470 /* 471 * Translate the partition-relative block number to an absolute. 472 */ 473 if (DISKPART(bp->b_dev) != RAW_PART) { 474 pp = &vnd->sc_dkdev.dk_label->d_partitions[DISKPART(bp->b_dev)]; 475 bn += pp->p_offset; 476 } 477 478 /* ...and convert to a byte offset within the file. */ 479 bn *= lp->d_secsize; 480 481 if (vnd->sc_vp->v_mount == NULL) { 482 bp->b_error = ENXIO; 483 bp->b_flags |= B_ERROR; 484 goto done; 485 } 486 bsize = vnd->sc_vp->v_mount->mnt_stat.f_iosize; 487 addr = bp->b_data; 488 flags = (bp->b_flags & (B_READ|B_ASYNC)) | B_CALL; 489 490 /* Allocate a header for this transfer and link it to the buffer */ 491 s = splbio(); 492 vnx = VND_GETXFER(vnd); 493 splx(s); 494 vnx->vx_flags = VX_BUSY; 495 vnx->vx_error = 0; 496 vnx->vx_pending = 0; 497 vnx->vx_bp = bp; 498 499 if ((flags & B_READ) == 0) 500 vn_start_write(vnd->sc_vp, &mp, V_WAIT); 501 502 for (resid = bp->b_resid; resid; resid -= sz) { 503 struct vndbuf *nbp; 504 struct vnode *vp; 505 daddr_t nbn; 506 int off, nra; 507 508 nra = 0; 509 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY | LK_CANRECURSE); 510 error = VOP_BMAP(vnd->sc_vp, bn / bsize, &vp, &nbn, &nra); 511 VOP_UNLOCK(vnd->sc_vp, 0); 512 513 if (error == 0 && (long)nbn == -1) 514 error = EIO; 515 516 /* 517 * If there was an error or a hole in the file...punt. 518 * Note that we may have to wait for any operations 519 * that we have already fired off before releasing 520 * the buffer. 521 * 522 * XXX we could deal with holes here but it would be 523 * a hassle (in the write case). 524 */ 525 if (error) { 526 s = splbio(); 527 vnx->vx_error = error; 528 goto out; 529 } 530 531 #ifdef DEBUG 532 if (!dovndcluster) 533 nra = 0; 534 #endif 535 536 if ((off = bn % bsize) != 0) 537 sz = bsize - off; 538 else 539 sz = (1 + nra) * bsize; 540 if (resid < sz) 541 sz = resid; 542 #ifdef DEBUG 543 if (vnddebug & VDB_IO) 544 printf("vndstrategy: vp %p/%p bn 0x%qx/0x%" PRIx64 545 " sz 0x%x\n", 546 vnd->sc_vp, vp, (long long)bn, nbn, sz); 547 #endif 548 549 s = splbio(); 550 nbp = VND_GETBUF(vnd); 551 splx(s); 552 BUF_INIT(&nbp->vb_buf); 553 nbp->vb_buf.b_flags = flags; 554 nbp->vb_buf.b_bcount = sz; 555 nbp->vb_buf.b_bufsize = round_page((ulong)addr + sz) 556 - trunc_page((ulong) addr); 557 nbp->vb_buf.b_error = 0; 558 nbp->vb_buf.b_data = addr; 559 nbp->vb_buf.b_blkno = nbp->vb_buf.b_rawblkno = nbn + btodb(off); 560 nbp->vb_buf.b_proc = bp->b_proc; 561 nbp->vb_buf.b_iodone = vndiodone; 562 nbp->vb_buf.b_vp = NULLVP; 563 564 nbp->vb_xfer = vnx; 565 566 /* 567 * Just sort by block number 568 */ 569 s = splbio(); 570 if (vnx->vx_error != 0) { 571 VND_PUTBUF(vnd, nbp); 572 goto out; 573 } 574 vnx->vx_pending++; 575 bgetvp(vp, &nbp->vb_buf); 576 BUFQ_PUT(&vnd->sc_tab, &nbp->vb_buf); 577 vndstart(vnd); 578 splx(s); 579 bn += sz; 580 addr += sz; 581 } 582 583 s = splbio(); 584 585 out: /* Arrive here at splbio */ 586 if ((flags & B_READ) == 0) 587 vn_finished_write(mp, 0); 588 vnx->vx_flags &= ~VX_BUSY; 589 if (vnx->vx_pending == 0) { 590 if (vnx->vx_error != 0) { 591 bp->b_error = vnx->vx_error; 592 bp->b_flags |= B_ERROR; 593 } 594 VND_PUTXFER(vnd, vnx); 595 biodone(bp); 596 } 597 splx(s); 598 return; 599 600 done: 601 biodone(bp); 602 } 603 604 /* 605 * Feed requests sequentially. 606 * We do it this way to keep from flooding NFS servers if we are connected 607 * to an NFS file. This places the burden on the client rather than the 608 * server. 609 */ 610 void 611 vndstart(vnd) 612 struct vnd_softc *vnd; 613 { 614 struct buf *bp; 615 616 /* 617 * Dequeue now since lower level strategy routine might 618 * queue using same links 619 */ 620 621 if ((vnd->sc_flags & VNF_BUSY) != 0) 622 return; 623 624 vnd->sc_flags |= VNF_BUSY; 625 626 while (vnd->sc_active < vnd->sc_maxactive) { 627 bp = BUFQ_GET(&vnd->sc_tab); 628 if (bp == NULL) 629 break; 630 vnd->sc_active++; 631 #ifdef DEBUG 632 if (vnddebug & VDB_IO) 633 printf("vndstart(%ld): bp %p vp %p blkno 0x%" PRIx64 634 " flags %lx addr %p cnt 0x%lx\n", 635 (long) (vnd-vnd_softc), bp, bp->b_vp, bp->b_blkno, 636 bp->b_flags, bp->b_data, bp->b_bcount); 637 #endif 638 639 /* Instrumentation. */ 640 disk_busy(&vnd->sc_dkdev); 641 642 if ((bp->b_flags & B_READ) == 0) 643 bp->b_vp->v_numoutput++; 644 VOP_STRATEGY(bp); 645 } 646 vnd->sc_flags &= ~VNF_BUSY; 647 } 648 649 void 650 vndiodone(bp) 651 struct buf *bp; 652 { 653 struct vndbuf *vbp = (struct vndbuf *) bp; 654 struct vndxfer *vnx = (struct vndxfer *)vbp->vb_xfer; 655 struct buf *pbp = vnx->vx_bp; 656 struct vnd_softc *vnd = &vnd_softc[vndunit(pbp->b_dev)]; 657 int s, resid; 658 659 s = splbio(); 660 #ifdef DEBUG 661 if (vnddebug & VDB_IO) 662 printf("vndiodone(%ld): vbp %p vp %p blkno 0x%" PRIx64 663 " addr %p cnt 0x%lx\n", 664 (long) (vnd-vnd_softc), vbp, vbp->vb_buf.b_vp, 665 vbp->vb_buf.b_blkno, vbp->vb_buf.b_data, 666 vbp->vb_buf.b_bcount); 667 #endif 668 669 resid = vbp->vb_buf.b_bcount - vbp->vb_buf.b_resid; 670 pbp->b_resid -= resid; 671 disk_unbusy(&vnd->sc_dkdev, resid, (pbp->b_flags & B_READ)); 672 vnx->vx_pending--; 673 674 if (vbp->vb_buf.b_error) { 675 #ifdef DEBUG 676 if (vnddebug & VDB_IO) 677 printf("vndiodone: vbp %p error %d\n", vbp, 678 vbp->vb_buf.b_error); 679 #endif 680 vnx->vx_error = vbp->vb_buf.b_error; 681 } 682 683 if (vbp->vb_buf.b_vp != NULLVP) 684 brelvp(&vbp->vb_buf); 685 686 VND_PUTBUF(vnd, vbp); 687 688 /* 689 * Wrap up this transaction if it has run to completion or, in 690 * case of an error, when all auxiliary buffers have returned. 691 */ 692 if (vnx->vx_error != 0) { 693 pbp->b_flags |= B_ERROR; 694 pbp->b_error = vnx->vx_error; 695 if ((vnx->vx_flags & VX_BUSY) == 0 && vnx->vx_pending == 0) { 696 697 #ifdef DEBUG 698 if (vnddebug & VDB_IO) 699 printf("vndiodone: pbp %p iodone: error %d\n", 700 pbp, vnx->vx_error); 701 #endif 702 VND_PUTXFER(vnd, vnx); 703 biodone(pbp); 704 } 705 } else if (pbp->b_resid == 0) { 706 707 #ifdef DIAGNOSTIC 708 if (vnx->vx_pending != 0) 709 panic("vndiodone: vnx pending: %d", vnx->vx_pending); 710 #endif 711 712 if ((vnx->vx_flags & VX_BUSY) == 0) { 713 #ifdef DEBUG 714 if (vnddebug & VDB_IO) 715 printf("vndiodone: pbp %p iodone\n", pbp); 716 #endif 717 VND_PUTXFER(vnd, vnx); 718 biodone(pbp); 719 } 720 } 721 722 vnd->sc_active--; 723 vndstart(vnd); 724 splx(s); 725 } 726 727 /* ARGSUSED */ 728 int 729 vndread(dev, uio, flags) 730 dev_t dev; 731 struct uio *uio; 732 int flags; 733 { 734 int unit = vndunit(dev); 735 struct vnd_softc *sc; 736 737 #ifdef DEBUG 738 if (vnddebug & VDB_FOLLOW) 739 printf("vndread(0x%x, %p)\n", dev, uio); 740 #endif 741 742 if (unit >= numvnd) 743 return (ENXIO); 744 sc = &vnd_softc[unit]; 745 746 if ((sc->sc_flags & VNF_INITED) == 0) 747 return (ENXIO); 748 749 return (physio(vndstrategy, NULL, dev, B_READ, minphys, uio)); 750 } 751 752 /* ARGSUSED */ 753 int 754 vndwrite(dev, uio, flags) 755 dev_t dev; 756 struct uio *uio; 757 int flags; 758 { 759 int unit = vndunit(dev); 760 struct vnd_softc *sc; 761 762 #ifdef DEBUG 763 if (vnddebug & VDB_FOLLOW) 764 printf("vndwrite(0x%x, %p)\n", dev, uio); 765 #endif 766 767 if (unit >= numvnd) 768 return (ENXIO); 769 sc = &vnd_softc[unit]; 770 771 if ((sc->sc_flags & VNF_INITED) == 0) 772 return (ENXIO); 773 774 return (physio(vndstrategy, NULL, dev, B_WRITE, minphys, uio)); 775 } 776 777 /* ARGSUSED */ 778 int 779 vndioctl(dev, cmd, data, flag, p) 780 dev_t dev; 781 u_long cmd; 782 caddr_t data; 783 int flag; 784 struct proc *p; 785 { 786 int unit = vndunit(dev); 787 struct vnd_softc *vnd; 788 struct vnd_ioctl *vio; 789 struct vattr vattr; 790 struct nameidata nd; 791 int error, part, pmask; 792 size_t geomsize; 793 int fflags; 794 #ifdef __HAVE_OLD_DISKLABEL 795 struct disklabel newlabel; 796 #endif 797 798 #ifdef DEBUG 799 if (vnddebug & VDB_FOLLOW) 800 printf("vndioctl(0x%x, 0x%lx, %p, 0x%x, %p): unit %d\n", 801 dev, cmd, data, flag, p, unit); 802 #endif 803 if (unit >= numvnd) 804 return (ENXIO); 805 806 vnd = &vnd_softc[unit]; 807 vio = (struct vnd_ioctl *)data; 808 809 /* Must be open for writes for these commands... */ 810 switch (cmd) { 811 case VNDIOCSET: 812 case VNDIOCCLR: 813 case DIOCSDINFO: 814 case DIOCWDINFO: 815 #ifdef __HAVE_OLD_DISKLABEL 816 case ODIOCSDINFO: 817 case ODIOCWDINFO: 818 #endif 819 case DIOCKLABEL: 820 case DIOCWLABEL: 821 if ((flag & FWRITE) == 0) 822 return (EBADF); 823 } 824 825 /* Must be initialized for these... */ 826 switch (cmd) { 827 case VNDIOCCLR: 828 case DIOCGDINFO: 829 case DIOCSDINFO: 830 case DIOCWDINFO: 831 case DIOCGPART: 832 case DIOCKLABEL: 833 case DIOCWLABEL: 834 case DIOCGDEFLABEL: 835 #ifdef __HAVE_OLD_DISKLABEL 836 case ODIOCGDINFO: 837 case ODIOCSDINFO: 838 case ODIOCWDINFO: 839 case ODIOCGDEFLABEL: 840 #endif 841 if ((vnd->sc_flags & VNF_INITED) == 0) 842 return (ENXIO); 843 } 844 845 switch (cmd) { 846 case VNDIOCSET: 847 if (vnd->sc_flags & VNF_INITED) 848 return (EBUSY); 849 850 if ((error = vndlock(vnd)) != 0) 851 return (error); 852 853 fflags = FREAD; 854 if ((vio->vnd_flags & VNDIOF_READONLY) == 0) 855 fflags |= FWRITE; 856 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, vio->vnd_file, p); 857 if ((error = vn_open(&nd, fflags, 0)) != 0) 858 goto unlock_and_exit; 859 error = VOP_GETATTR(nd.ni_vp, &vattr, p->p_ucred, p); 860 VOP_UNLOCK(nd.ni_vp, 0); 861 if (!error && nd.ni_vp->v_type != VREG) 862 error = EOPNOTSUPP; 863 if (error) 864 goto close_and_exit; 865 vnd->sc_vp = nd.ni_vp; 866 vnd->sc_size = btodb(vattr.va_size); /* note truncation */ 867 868 /* 869 * Use pseudo-geometry specified. If none was provided, 870 * use "standard" Adaptec fictitious geometry. 871 */ 872 if (vio->vnd_flags & VNDIOF_HASGEOM) { 873 874 memcpy(&vnd->sc_geom, &vio->vnd_geom, 875 sizeof(vio->vnd_geom)); 876 877 /* 878 * Sanity-check the sector size. 879 * XXX Don't allow secsize < DEV_BSIZE. Should 880 * XXX we? 881 */ 882 if (vnd->sc_geom.vng_secsize < DEV_BSIZE || 883 (vnd->sc_geom.vng_secsize % DEV_BSIZE) != 0) { 884 error = EINVAL; 885 goto close_and_exit; 886 } 887 888 /* 889 * Compute the size (in DEV_BSIZE blocks) specified 890 * by the geometry. 891 */ 892 geomsize = (vnd->sc_geom.vng_nsectors * 893 vnd->sc_geom.vng_ntracks * 894 vnd->sc_geom.vng_ncylinders) * 895 (vnd->sc_geom.vng_secsize / DEV_BSIZE); 896 897 /* 898 * Sanity-check the size against the specified 899 * geometry. 900 */ 901 if (vnd->sc_size < geomsize) { 902 error = EINVAL; 903 goto close_and_exit; 904 } 905 } else { 906 /* 907 * Size must be at least 2048 DEV_BSIZE blocks 908 * (1M) in order to use this geometry. 909 */ 910 if (vnd->sc_size < (32 * 64)) { 911 error = EINVAL; 912 goto close_and_exit; 913 } 914 915 vnd->sc_geom.vng_secsize = DEV_BSIZE; 916 vnd->sc_geom.vng_nsectors = 32; 917 vnd->sc_geom.vng_ntracks = 64; 918 vnd->sc_geom.vng_ncylinders = vnd->sc_size / (64 * 32); 919 } 920 921 if (vio->vnd_flags & VNDIOF_READONLY) { 922 vnd->sc_flags |= VNF_READONLY; 923 } 924 925 if ((error = vndsetcred(vnd, p->p_ucred)) != 0) 926 goto close_and_exit; 927 vndthrottle(vnd, vnd->sc_vp); 928 vio->vnd_size = dbtob(vnd->sc_size); 929 vnd->sc_flags |= VNF_INITED; 930 #ifdef DEBUG 931 if (vnddebug & VDB_INIT) 932 printf("vndioctl: SET vp %p size 0x%lx %d/%d/%d/%d\n", 933 vnd->sc_vp, (unsigned long) vnd->sc_size, 934 vnd->sc_geom.vng_secsize, 935 vnd->sc_geom.vng_nsectors, 936 vnd->sc_geom.vng_ntracks, 937 vnd->sc_geom.vng_ncylinders); 938 #endif 939 940 /* Attach the disk. */ 941 memset(vnd->sc_xname, 0, sizeof(vnd->sc_xname)); /* XXX */ 942 sprintf(vnd->sc_xname, "vnd%d", unit); /* XXX */ 943 vnd->sc_dkdev.dk_name = vnd->sc_xname; 944 disk_attach(&vnd->sc_dkdev); 945 946 /* Initialize the xfer and buffer pools. */ 947 pool_init(&vnd->sc_vxpool, sizeof(struct vndxfer), 0, 948 0, 0, "vndxpl", NULL); 949 pool_init(&vnd->sc_vbpool, sizeof(struct vndbuf), 0, 950 0, 0, "vndbpl", NULL); 951 952 /* Try and read the disklabel. */ 953 vndgetdisklabel(dev); 954 955 vndunlock(vnd); 956 957 break; 958 959 close_and_exit: 960 (void) vn_close(nd.ni_vp, fflags, p->p_ucred, p); 961 unlock_and_exit: 962 vndunlock(vnd); 963 return (error); 964 965 case VNDIOCCLR: 966 if ((error = vndlock(vnd)) != 0) 967 return (error); 968 969 /* 970 * Don't unconfigure if any other partitions are open 971 * or if both the character and block flavors of this 972 * partition are open. 973 */ 974 part = DISKPART(dev); 975 pmask = (1 << part); 976 if (((vnd->sc_dkdev.dk_openmask & ~pmask) || 977 ((vnd->sc_dkdev.dk_bopenmask & pmask) && 978 (vnd->sc_dkdev.dk_copenmask & pmask))) && 979 !(vio->vnd_flags & VNDIOF_FORCE)) { 980 vndunlock(vnd); 981 return (EBUSY); 982 } 983 984 /* 985 * XXX vndclear() might call vndclose() implicitely; 986 * release lock to avoid recursion 987 */ 988 vndunlock(vnd); 989 vndclear(vnd, minor(dev)); 990 #ifdef DEBUG 991 if (vnddebug & VDB_INIT) 992 printf("vndioctl: CLRed\n"); 993 #endif 994 995 /* Destroy the xfer and buffer pools. */ 996 pool_destroy(&vnd->sc_vxpool); 997 pool_destroy(&vnd->sc_vbpool); 998 999 /* Detatch the disk. */ 1000 disk_detach(&vnd->sc_dkdev); 1001 1002 break; 1003 1004 case VNDIOCGET: { 1005 struct vnd_user *vnu; 1006 struct vattr va; 1007 1008 vnu = (struct vnd_user *)data; 1009 1010 if (vnu->vnu_unit == -1) 1011 vnu->vnu_unit = unit; 1012 if (vnu->vnu_unit >= numvnd) 1013 return (ENXIO); 1014 if (vnu->vnu_unit < 0) 1015 return (EINVAL); 1016 1017 vnd = &vnd_softc[vnu->vnu_unit]; 1018 1019 if (vnd->sc_flags & VNF_INITED) { 1020 error = VOP_GETATTR(vnd->sc_vp, &va, p->p_ucred, p); 1021 if (error) 1022 return (error); 1023 vnu->vnu_dev = va.va_fsid; 1024 vnu->vnu_ino = va.va_fileid; 1025 } 1026 else { 1027 /* unused is not an error */ 1028 vnu->vnu_dev = 0; 1029 vnu->vnu_ino = 0; 1030 } 1031 1032 break; 1033 } 1034 1035 case DIOCGDINFO: 1036 *(struct disklabel *)data = *(vnd->sc_dkdev.dk_label); 1037 break; 1038 1039 #ifdef __HAVE_OLD_DISKLABEL 1040 case ODIOCGDINFO: 1041 newlabel = *(vnd->sc_dkdev.dk_label); 1042 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 1043 return ENOTTY; 1044 memcpy(data, &newlabel, sizeof (struct olddisklabel)); 1045 break; 1046 #endif 1047 1048 case DIOCGPART: 1049 ((struct partinfo *)data)->disklab = vnd->sc_dkdev.dk_label; 1050 ((struct partinfo *)data)->part = 1051 &vnd->sc_dkdev.dk_label->d_partitions[DISKPART(dev)]; 1052 break; 1053 1054 case DIOCWDINFO: 1055 case DIOCSDINFO: 1056 #ifdef __HAVE_OLD_DISKLABEL 1057 case ODIOCWDINFO: 1058 case ODIOCSDINFO: 1059 #endif 1060 { 1061 struct disklabel *lp; 1062 1063 if ((error = vndlock(vnd)) != 0) 1064 return (error); 1065 1066 vnd->sc_flags |= VNF_LABELLING; 1067 1068 #ifdef __HAVE_OLD_DISKLABEL 1069 if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) { 1070 memset(&newlabel, 0, sizeof newlabel); 1071 memcpy(&newlabel, data, sizeof (struct olddisklabel)); 1072 lp = &newlabel; 1073 } else 1074 #endif 1075 lp = (struct disklabel *)data; 1076 1077 error = setdisklabel(vnd->sc_dkdev.dk_label, 1078 lp, 0, vnd->sc_dkdev.dk_cpulabel); 1079 if (error == 0) { 1080 if (cmd == DIOCWDINFO 1081 #ifdef __HAVE_OLD_DISKLABEL 1082 || cmd == ODIOCWDINFO 1083 #endif 1084 ) 1085 error = writedisklabel(VNDLABELDEV(dev), 1086 vndstrategy, vnd->sc_dkdev.dk_label, 1087 vnd->sc_dkdev.dk_cpulabel); 1088 } 1089 1090 vnd->sc_flags &= ~VNF_LABELLING; 1091 1092 vndunlock(vnd); 1093 1094 if (error) 1095 return (error); 1096 break; 1097 } 1098 1099 case DIOCKLABEL: 1100 if (*(int *)data != 0) 1101 vnd->sc_flags |= VNF_KLABEL; 1102 else 1103 vnd->sc_flags &= ~VNF_KLABEL; 1104 break; 1105 1106 case DIOCWLABEL: 1107 if (*(int *)data != 0) 1108 vnd->sc_flags |= VNF_WLABEL; 1109 else 1110 vnd->sc_flags &= ~VNF_WLABEL; 1111 break; 1112 1113 case DIOCGDEFLABEL: 1114 vndgetdefaultlabel(vnd, (struct disklabel *)data); 1115 break; 1116 1117 #ifdef __HAVE_OLD_DISKLABEL 1118 case ODIOCGDEFLABEL: 1119 vndgetdefaultlabel(vnd, &newlabel); 1120 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 1121 return ENOTTY; 1122 memcpy(data, &newlabel, sizeof (struct olddisklabel)); 1123 break; 1124 #endif 1125 1126 default: 1127 return (ENOTTY); 1128 } 1129 1130 return (0); 1131 } 1132 1133 /* 1134 * Duplicate the current processes' credentials. Since we are called only 1135 * as the result of a SET ioctl and only root can do that, any future access 1136 * to this "disk" is essentially as root. Note that credentials may change 1137 * if some other uid can write directly to the mapped file (NFS). 1138 */ 1139 int 1140 vndsetcred(vnd, cred) 1141 struct vnd_softc *vnd; 1142 struct ucred *cred; 1143 { 1144 struct uio auio; 1145 struct iovec aiov; 1146 char *tmpbuf; 1147 int error; 1148 1149 vnd->sc_cred = crdup(cred); 1150 tmpbuf = malloc(DEV_BSIZE, M_TEMP, M_WAITOK); 1151 1152 /* XXX: Horrible kludge to establish credentials for NFS */ 1153 aiov.iov_base = tmpbuf; 1154 aiov.iov_len = min(DEV_BSIZE, dbtob(vnd->sc_size)); 1155 auio.uio_iov = &aiov; 1156 auio.uio_iovcnt = 1; 1157 auio.uio_offset = 0; 1158 auio.uio_rw = UIO_READ; 1159 auio.uio_segflg = UIO_SYSSPACE; 1160 auio.uio_resid = aiov.iov_len; 1161 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 1162 error = VOP_READ(vnd->sc_vp, &auio, 0, vnd->sc_cred); 1163 if (error == 0) { 1164 /* 1165 * Because vnd does all IO directly through the vnode 1166 * we need to flush (at least) the buffer from the above 1167 * VOP_READ from the buffer cache to prevent cache 1168 * incoherencies. Also, be careful to write dirty 1169 * buffers back to stable storage. 1170 */ 1171 error = vinvalbuf(vnd->sc_vp, V_SAVE, vnd->sc_cred, 1172 curproc, 0, 0); 1173 } 1174 VOP_UNLOCK(vnd->sc_vp, 0); 1175 1176 free(tmpbuf, M_TEMP); 1177 return (error); 1178 } 1179 1180 /* 1181 * Set maxactive based on FS type 1182 */ 1183 void 1184 vndthrottle(vnd, vp) 1185 struct vnd_softc *vnd; 1186 struct vnode *vp; 1187 { 1188 #ifdef NFS 1189 extern int (**nfsv2_vnodeop_p) __P((void *)); 1190 1191 if (vp->v_op == nfsv2_vnodeop_p) 1192 vnd->sc_maxactive = 2; 1193 else 1194 #endif 1195 vnd->sc_maxactive = 8; 1196 1197 if (vnd->sc_maxactive < 1) 1198 vnd->sc_maxactive = 1; 1199 } 1200 1201 #if 0 1202 void 1203 vndshutdown() 1204 { 1205 struct vnd_softc *vnd; 1206 1207 for (vnd = &vnd_softc[0]; vnd < &vnd_softc[numvnd]; vnd++) 1208 if (vnd->sc_flags & VNF_INITED) 1209 vndclear(vnd); 1210 } 1211 #endif 1212 1213 void 1214 vndclear(vnd, myminor) 1215 struct vnd_softc *vnd; 1216 int myminor; 1217 { 1218 struct vnode *vp = vnd->sc_vp; 1219 struct proc *p = curproc; /* XXX */ 1220 int fflags = FREAD; 1221 int bmaj, cmaj, i, mn; 1222 1223 #ifdef DEBUG 1224 if (vnddebug & VDB_FOLLOW) 1225 printf("vndclear(%p): vp %p\n", vnd, vp); 1226 #endif 1227 /* locate the major number */ 1228 bmaj = bdevsw_lookup_major(&vnd_bdevsw); 1229 cmaj = cdevsw_lookup_major(&vnd_cdevsw); 1230 1231 /* Nuke the vnodes for any open instances */ 1232 for (i = 0; i < MAXPARTITIONS; i++) { 1233 mn = DISKMINOR(vnd->sc_unit, i); 1234 vdevgone(bmaj, mn, mn, VBLK); 1235 if (mn != myminor) /* XXX avoid to kill own vnode */ 1236 vdevgone(cmaj, mn, mn, VCHR); 1237 } 1238 1239 if ((vnd->sc_flags & VNF_READONLY) == 0) 1240 fflags |= FWRITE; 1241 vnd->sc_flags &= ~(VNF_INITED | VNF_READONLY | VNF_VLABEL); 1242 if (vp == (struct vnode *)0) 1243 panic("vndioctl: null vp"); 1244 (void) vn_close(vp, fflags, vnd->sc_cred, p); 1245 crfree(vnd->sc_cred); 1246 vnd->sc_vp = (struct vnode *)0; 1247 vnd->sc_cred = (struct ucred *)0; 1248 vnd->sc_size = 0; 1249 } 1250 1251 int 1252 vndsize(dev) 1253 dev_t dev; 1254 { 1255 struct vnd_softc *sc; 1256 struct disklabel *lp; 1257 int part, unit, omask; 1258 int size; 1259 1260 unit = vndunit(dev); 1261 if (unit >= numvnd) 1262 return (-1); 1263 sc = &vnd_softc[unit]; 1264 1265 if ((sc->sc_flags & VNF_INITED) == 0) 1266 return (-1); 1267 1268 part = DISKPART(dev); 1269 omask = sc->sc_dkdev.dk_openmask & (1 << part); 1270 lp = sc->sc_dkdev.dk_label; 1271 1272 if (omask == 0 && vndopen(dev, 0, S_IFBLK, curproc)) 1273 return (-1); 1274 1275 if (lp->d_partitions[part].p_fstype != FS_SWAP) 1276 size = -1; 1277 else 1278 size = lp->d_partitions[part].p_size * 1279 (lp->d_secsize / DEV_BSIZE); 1280 1281 if (omask == 0 && vndclose(dev, 0, S_IFBLK, curproc)) 1282 return (-1); 1283 1284 return (size); 1285 } 1286 1287 int 1288 vnddump(dev, blkno, va, size) 1289 dev_t dev; 1290 daddr_t blkno; 1291 caddr_t va; 1292 size_t size; 1293 { 1294 1295 /* Not implemented. */ 1296 return ENXIO; 1297 } 1298 1299 void 1300 vndgetdefaultlabel(sc, lp) 1301 struct vnd_softc *sc; 1302 struct disklabel *lp; 1303 { 1304 struct vndgeom *vng = &sc->sc_geom; 1305 struct partition *pp; 1306 1307 memset(lp, 0, sizeof(*lp)); 1308 1309 lp->d_secperunit = sc->sc_size / (vng->vng_secsize / DEV_BSIZE); 1310 lp->d_secsize = vng->vng_secsize; 1311 lp->d_nsectors = vng->vng_nsectors; 1312 lp->d_ntracks = vng->vng_ntracks; 1313 lp->d_ncylinders = vng->vng_ncylinders; 1314 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 1315 1316 strncpy(lp->d_typename, "vnd", sizeof(lp->d_typename)); 1317 lp->d_type = DTYPE_VND; 1318 strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname)); 1319 lp->d_rpm = 3600; 1320 lp->d_interleave = 1; 1321 lp->d_flags = 0; 1322 1323 pp = &lp->d_partitions[RAW_PART]; 1324 pp->p_offset = 0; 1325 pp->p_size = lp->d_secperunit; 1326 pp->p_fstype = FS_UNUSED; 1327 lp->d_npartitions = RAW_PART + 1; 1328 1329 lp->d_magic = DISKMAGIC; 1330 lp->d_magic2 = DISKMAGIC; 1331 lp->d_checksum = dkcksum(lp); 1332 } 1333 1334 /* 1335 * Read the disklabel from a vnd. If one is not present, create a fake one. 1336 */ 1337 void 1338 vndgetdisklabel(dev) 1339 dev_t dev; 1340 { 1341 struct vnd_softc *sc = &vnd_softc[vndunit(dev)]; 1342 const char *errstring; 1343 struct disklabel *lp = sc->sc_dkdev.dk_label; 1344 struct cpu_disklabel *clp = sc->sc_dkdev.dk_cpulabel; 1345 int i; 1346 1347 memset(clp, 0, sizeof(*clp)); 1348 1349 vndgetdefaultlabel(sc, lp); 1350 1351 /* 1352 * Call the generic disklabel extraction routine. 1353 */ 1354 errstring = readdisklabel(VNDLABELDEV(dev), vndstrategy, lp, clp); 1355 if (errstring) { 1356 /* 1357 * Lack of disklabel is common, but we print the warning 1358 * anyway, since it might contain other useful information. 1359 */ 1360 printf("%s: %s\n", sc->sc_xname, errstring); 1361 1362 /* 1363 * For historical reasons, if there's no disklabel 1364 * present, all partitions must be FS_BSDFFS and 1365 * occupy the entire disk. 1366 */ 1367 for (i = 0; i < MAXPARTITIONS; i++) { 1368 /* 1369 * Don't wipe out port specific hack (such as 1370 * dos partition hack of i386 port). 1371 */ 1372 if (lp->d_partitions[i].p_size != 0) 1373 continue; 1374 1375 lp->d_partitions[i].p_size = lp->d_secperunit; 1376 lp->d_partitions[i].p_offset = 0; 1377 lp->d_partitions[i].p_fstype = FS_BSDFFS; 1378 } 1379 1380 strncpy(lp->d_packname, "default label", 1381 sizeof(lp->d_packname)); 1382 1383 lp->d_npartitions = MAXPARTITIONS; 1384 lp->d_checksum = dkcksum(lp); 1385 } 1386 1387 /* In-core label now valid. */ 1388 sc->sc_flags |= VNF_VLABEL; 1389 } 1390 1391 /* 1392 * Wait interruptibly for an exclusive lock. 1393 * 1394 * XXX 1395 * Several drivers do this; it should be abstracted and made MP-safe. 1396 */ 1397 static int 1398 vndlock(sc) 1399 struct vnd_softc *sc; 1400 { 1401 int error; 1402 1403 while ((sc->sc_flags & VNF_LOCKED) != 0) { 1404 sc->sc_flags |= VNF_WANTED; 1405 if ((error = tsleep(sc, PRIBIO | PCATCH, "vndlck", 0)) != 0) 1406 return (error); 1407 } 1408 sc->sc_flags |= VNF_LOCKED; 1409 return (0); 1410 } 1411 1412 /* 1413 * Unlock and wake up any waiters. 1414 */ 1415 static void 1416 vndunlock(sc) 1417 struct vnd_softc *sc; 1418 { 1419 1420 sc->sc_flags &= ~VNF_LOCKED; 1421 if ((sc->sc_flags & VNF_WANTED) != 0) { 1422 sc->sc_flags &= ~VNF_WANTED; 1423 wakeup(sc); 1424 } 1425 } 1426
Indexes created Tue Sep 30 11:09:46 GMT 2025