1 /* $NetBSD: vnd.c,v 1.65 2000/03/30 12:45:27 augustss 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) 1988 University of Utah. 41 * Copyright (c) 1990, 1993 42 * The Regents of the University of California. All rights reserved. 43 * 44 * This code is derived from software contributed to Berkeley by 45 * the Systems Programming Group of the University of Utah Computer 46 * Science Department. 47 * 48 * Redistribution and use in source and binary forms, with or without 49 * modification, are permitted provided that the following conditions 50 * are met: 51 * 1. Redistributions of source code must retain the above copyright 52 * notice, this list of conditions and the following disclaimer. 53 * 2. Redistributions in binary form must reproduce the above copyright 54 * notice, this list of conditions and the following disclaimer in the 55 * documentation and/or other materials provided with the distribution. 56 * 3. All advertising materials mentioning features or use of this software 57 * must display the following acknowledgement: 58 * This product includes software developed by the University of 59 * California, Berkeley and its contributors. 60 * 4. Neither the name of the University nor the names of its contributors 61 * may be used to endorse or promote products derived from this software 62 * without specific prior written permission. 63 * 64 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 65 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 66 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 67 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 68 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 69 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 70 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 71 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 72 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 73 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 74 * SUCH DAMAGE. 75 * 76 * from: Utah $Hdr: vn.c 1.13 94/04/02$ 77 * 78 * @(#)vn.c 8.9 (Berkeley) 5/14/95 79 */ 80 81 /* 82 * Vnode disk driver. 83 * 84 * Block/character interface to a vnode. Allows one to treat a file 85 * as a disk (e.g. build a filesystem in it, mount it, etc.). 86 * 87 * NOTE 1: This uses the VOP_BMAP/VOP_STRATEGY interface to the vnode 88 * instead of a simple VOP_RDWR. We do this to avoid distorting the 89 * local buffer cache. 90 * 91 * NOTE 2: There is a security issue involved with this driver. 92 * Once mounted all access to the contents of the "mapped" file via 93 * the special file is controlled by the permissions on the special 94 * file, the protection of the mapped file is ignored (effectively, 95 * by using root credentials in all transactions). 96 * 97 * NOTE 3: Doesn't interact with leases, should it? 98 */ 99 100 #include "fs_nfs.h" 101 102 #include <sys/param.h> 103 #include <sys/systm.h> 104 #include <sys/namei.h> 105 #include <sys/proc.h> 106 #include <sys/errno.h> 107 #include <sys/buf.h> 108 #include <sys/malloc.h> 109 #include <sys/ioctl.h> 110 #include <sys/disklabel.h> 111 #include <sys/device.h> 112 #include <sys/disk.h> 113 #include <sys/stat.h> 114 #include <sys/mount.h> 115 #include <sys/vnode.h> 116 #include <sys/file.h> 117 #include <sys/uio.h> 118 #include <sys/conf.h> 119 120 #include <miscfs/specfs/specdev.h> 121 122 #include <dev/vndvar.h> 123 124 #if defined(VNDDEBUG) && !defined(DEBUG) 125 #define DEBUG 126 #endif 127 128 #ifdef DEBUG 129 int dovndcluster = 1; 130 #define VDB_FOLLOW 0x01 131 #define VDB_INIT 0x02 132 #define VDB_IO 0x04 133 #define VDB_LABEL 0x08 134 int vnddebug = 0x00; 135 #endif 136 137 #define vndunit(x) DISKUNIT(x) 138 139 struct vndxfer { 140 struct buf *vx_bp; /* Pointer to parent buffer */ 141 int vx_error; 142 int vx_pending; /* # of pending aux buffers */ 143 int vx_flags; 144 #define VX_BUSY 1 145 }; 146 147 struct vndbuf { 148 struct buf vb_buf; 149 struct vndxfer *vb_xfer; 150 }; 151 152 #define VND_GETXFER(vnd) pool_get(&(vnd)->sc_vxpool, PR_NOWAIT) 153 #define VND_PUTXFER(vnd, vx) pool_put(&(vnd)->sc_vxpool, (vx)) 154 155 #define VND_GETBUF(vnd) pool_get(&(vnd)->sc_vbpool, PR_NOWAIT) 156 #define VND_PUTBUF(vnd, vb) pool_put(&(vnd)->sc_vbpool, (vb)) 157 158 struct vnd_softc *vnd_softc; 159 int numvnd = 0; 160 161 #define VNDLABELDEV(dev) \ 162 (MAKEDISKDEV(major((dev)), vndunit((dev)), RAW_PART)) 163 164 /* called by main() at boot time */ 165 void vndattach __P((int)); 166 167 void vndclear __P((struct vnd_softc *)); 168 void vndstart __P((struct vnd_softc *)); 169 int vndsetcred __P((struct vnd_softc *, struct ucred *)); 170 void vndthrottle __P((struct vnd_softc *, struct vnode *)); 171 void vndiodone __P((struct buf *)); 172 void vndshutdown __P((void)); 173 174 void vndgetdefaultlabel __P((struct vnd_softc *, struct disklabel *)); 175 void vndgetdisklabel __P((dev_t)); 176 177 static int vndlock __P((struct vnd_softc *)); 178 static void vndunlock __P((struct vnd_softc *)); 179 180 void 181 vndattach(num) 182 int num; 183 { 184 int i; 185 char *mem; 186 187 if (num <= 0) 188 return; 189 i = num * sizeof(struct vnd_softc); 190 mem = malloc(i, M_DEVBUF, M_NOWAIT); 191 if (mem == NULL) { 192 printf("WARNING: no memory for vnode disks\n"); 193 return; 194 } 195 bzero(mem, i); 196 vnd_softc = (struct vnd_softc *)mem; 197 numvnd = num; 198 199 for (i = 0; i < numvnd; i++) 200 BUFQ_INIT(&vnd_softc[i].sc_tab); 201 } 202 203 int 204 vndopen(dev, flags, mode, p) 205 dev_t dev; 206 int flags, mode; 207 struct proc *p; 208 { 209 int unit = vndunit(dev); 210 struct vnd_softc *sc; 211 int error = 0, part, pmask; 212 struct disklabel *lp; 213 214 #ifdef DEBUG 215 if (vnddebug & VDB_FOLLOW) 216 printf("vndopen(0x%x, 0x%x, 0x%x, %p)\n", dev, flags, mode, p); 217 #endif 218 if (unit >= numvnd) 219 return (ENXIO); 220 sc = &vnd_softc[unit]; 221 222 if ((error = vndlock(sc)) != 0) 223 return (error); 224 225 lp = sc->sc_dkdev.dk_label; 226 227 part = DISKPART(dev); 228 pmask = (1 << part); 229 230 /* 231 * If we're initialized, check to see if there are any other 232 * open partitions. If not, then it's safe to update the 233 * in-core disklabel. 234 */ 235 if ((sc->sc_flags & VNF_INITED) && (sc->sc_dkdev.dk_openmask == 0)) 236 vndgetdisklabel(dev); 237 238 /* Check that the partitions exists. */ 239 if (part != RAW_PART) { 240 if (((sc->sc_flags & VNF_INITED) == 0) || 241 ((part >= lp->d_npartitions) || 242 (lp->d_partitions[part].p_fstype == FS_UNUSED))) { 243 error = ENXIO; 244 goto done; 245 } 246 } 247 248 /* Prevent our unit from being unconfigured while open. */ 249 switch (mode) { 250 case S_IFCHR: 251 sc->sc_dkdev.dk_copenmask |= pmask; 252 break; 253 254 case S_IFBLK: 255 sc->sc_dkdev.dk_bopenmask |= pmask; 256 break; 257 } 258 sc->sc_dkdev.dk_openmask = 259 sc->sc_dkdev.dk_copenmask | sc->sc_dkdev.dk_bopenmask; 260 261 done: 262 vndunlock(sc); 263 return (error); 264 } 265 266 int 267 vndclose(dev, flags, mode, p) 268 dev_t dev; 269 int flags, mode; 270 struct proc *p; 271 { 272 int unit = vndunit(dev); 273 struct vnd_softc *sc; 274 int error = 0, part; 275 276 #ifdef DEBUG 277 if (vnddebug & VDB_FOLLOW) 278 printf("vndclose(0x%x, 0x%x, 0x%x, %p)\n", dev, flags, mode, p); 279 #endif 280 281 if (unit >= numvnd) 282 return (ENXIO); 283 sc = &vnd_softc[unit]; 284 285 if ((error = vndlock(sc)) != 0) 286 return (error); 287 288 part = DISKPART(dev); 289 290 /* ...that much closer to allowing unconfiguration... */ 291 switch (mode) { 292 case S_IFCHR: 293 sc->sc_dkdev.dk_copenmask &= ~(1 << part); 294 break; 295 296 case S_IFBLK: 297 sc->sc_dkdev.dk_bopenmask &= ~(1 << part); 298 break; 299 } 300 sc->sc_dkdev.dk_openmask = 301 sc->sc_dkdev.dk_copenmask | sc->sc_dkdev.dk_bopenmask; 302 303 vndunlock(sc); 304 return (0); 305 } 306 307 /* 308 * Break the request into bsize pieces and submit using VOP_BMAP/VOP_STRATEGY. 309 */ 310 void 311 vndstrategy(bp) 312 struct buf *bp; 313 { 314 int unit = vndunit(bp->b_dev); 315 struct vnd_softc *vnd = &vnd_softc[unit]; 316 struct vndxfer *vnx; 317 int s, bn, bsize, resid; 318 caddr_t addr; 319 int sz, flags, error, wlabel; 320 struct disklabel *lp; 321 struct partition *pp; 322 323 #ifdef DEBUG 324 if (vnddebug & VDB_FOLLOW) 325 printf("vndstrategy(%p): unit %d\n", bp, unit); 326 #endif 327 if ((vnd->sc_flags & VNF_INITED) == 0) { 328 bp->b_error = ENXIO; 329 bp->b_flags |= B_ERROR; 330 goto done; 331 } 332 333 /* If it's a nil transfer, wake up the top half now. */ 334 if (bp->b_bcount == 0) 335 goto done; 336 337 lp = vnd->sc_dkdev.dk_label; 338 339 /* 340 * The transfer must be a whole number of blocks. 341 */ 342 if ((bp->b_bcount % lp->d_secsize) != 0) { 343 bp->b_error = EINVAL; 344 bp->b_flags |= B_ERROR; 345 goto done; 346 } 347 348 /* 349 * Do bounds checking and adjust transfer. If there's an error, 350 * the bounds check will flag that for us. 351 */ 352 wlabel = vnd->sc_flags & (VNF_WLABEL|VNF_LABELLING); 353 if (DISKPART(bp->b_dev) != RAW_PART) 354 if (bounds_check_with_label(bp, lp, wlabel) <= 0) 355 goto done; 356 357 bp->b_resid = bp->b_bcount; 358 359 /* 360 * Put the block number in terms of the logical blocksize 361 * of the "device". 362 */ 363 bn = bp->b_blkno / (lp->d_secsize / DEV_BSIZE); 364 365 /* 366 * Translate the partition-relative block number to an absolute. 367 */ 368 if (DISKPART(bp->b_dev) != RAW_PART) { 369 pp = &vnd->sc_dkdev.dk_label->d_partitions[DISKPART(bp->b_dev)]; 370 bn += pp->p_offset; 371 } 372 373 /* ...and convert to a byte offset within the file. */ 374 bn *= lp->d_secsize; 375 376 bsize = vnd->sc_vp->v_mount->mnt_stat.f_iosize; 377 addr = bp->b_data; 378 flags = bp->b_flags | B_CALL; 379 380 /* Allocate a header for this transfer and link it to the buffer */ 381 s = splbio(); 382 vnx = VND_GETXFER(vnd); 383 splx(s); 384 vnx->vx_flags = VX_BUSY; 385 vnx->vx_error = 0; 386 vnx->vx_pending = 0; 387 vnx->vx_bp = bp; 388 389 for (resid = bp->b_resid; resid; resid -= sz) { 390 struct vndbuf *nbp; 391 struct vnode *vp; 392 daddr_t nbn; 393 int off, nra; 394 395 nra = 0; 396 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY | LK_CANRECURSE); 397 error = VOP_BMAP(vnd->sc_vp, bn / bsize, &vp, &nbn, &nra); 398 VOP_UNLOCK(vnd->sc_vp, 0); 399 400 if (error == 0 && (long)nbn == -1) 401 error = EIO; 402 403 /* 404 * If there was an error or a hole in the file...punt. 405 * Note that we may have to wait for any operations 406 * that we have already fired off before releasing 407 * the buffer. 408 * 409 * XXX we could deal with holes here but it would be 410 * a hassle (in the write case). 411 */ 412 if (error) { 413 s = splbio(); 414 vnx->vx_error = error; 415 goto out; 416 } 417 418 #ifdef DEBUG 419 if (!dovndcluster) 420 nra = 0; 421 #endif 422 423 if ((off = bn % bsize) != 0) 424 sz = bsize - off; 425 else 426 sz = (1 + nra) * bsize; 427 if (resid < sz) 428 sz = resid; 429 #ifdef DEBUG 430 if (vnddebug & VDB_IO) 431 printf("vndstrategy: vp %p/%p bn 0x%x/0x%x sz 0x%x\n", 432 vnd->sc_vp, vp, bn, nbn, sz); 433 #endif 434 435 s = splbio(); 436 nbp = VND_GETBUF(vnd); 437 splx(s); 438 nbp->vb_buf.b_flags = flags; 439 nbp->vb_buf.b_bcount = sz; 440 nbp->vb_buf.b_bufsize = bp->b_bufsize; 441 nbp->vb_buf.b_error = 0; 442 nbp->vb_buf.b_data = addr; 443 nbp->vb_buf.b_blkno = nbp->vb_buf.b_rawblkno = nbn + btodb(off); 444 nbp->vb_buf.b_proc = bp->b_proc; 445 nbp->vb_buf.b_iodone = vndiodone; 446 nbp->vb_buf.b_vp = NULLVP; 447 nbp->vb_buf.b_rcred = vnd->sc_cred; /* XXX crdup? */ 448 nbp->vb_buf.b_wcred = vnd->sc_cred; /* XXX crdup? */ 449 LIST_INIT(&nbp->vb_buf.b_dep); 450 if (bp->b_dirtyend == 0) { 451 nbp->vb_buf.b_dirtyoff = 0; 452 nbp->vb_buf.b_dirtyend = sz; 453 } else { 454 nbp->vb_buf.b_dirtyoff = 455 max(0, bp->b_dirtyoff - (bp->b_bcount - resid)); 456 nbp->vb_buf.b_dirtyend = 457 min(sz, 458 max(0, bp->b_dirtyend - (bp->b_bcount-resid))); 459 } 460 if (bp->b_validend == 0) { 461 nbp->vb_buf.b_validoff = 0; 462 nbp->vb_buf.b_validend = sz; 463 } else { 464 nbp->vb_buf.b_validoff = 465 max(0, bp->b_validoff - (bp->b_bcount - resid)); 466 nbp->vb_buf.b_validend = 467 min(sz, 468 max(0, bp->b_validend - (bp->b_bcount-resid))); 469 } 470 471 nbp->vb_xfer = vnx; 472 473 /* 474 * Just sort by block number 475 */ 476 s = splbio(); 477 if (vnx->vx_error != 0) { 478 VND_PUTBUF(vnd, nbp); 479 goto out; 480 } 481 vnx->vx_pending++; 482 bgetvp(vp, &nbp->vb_buf); 483 disksort_blkno(&vnd->sc_tab, &nbp->vb_buf); 484 vndstart(vnd); 485 splx(s); 486 bn += sz; 487 addr += sz; 488 } 489 490 s = splbio(); 491 492 out: /* Arrive here at splbio */ 493 vnx->vx_flags &= ~VX_BUSY; 494 if (vnx->vx_pending == 0) { 495 if (vnx->vx_error != 0) { 496 bp->b_error = vnx->vx_error; 497 bp->b_flags |= B_ERROR; 498 } 499 VND_PUTXFER(vnd, vnx); 500 biodone(bp); 501 } 502 splx(s); 503 return; 504 505 done: 506 biodone(bp); 507 } 508 509 /* 510 * Feed requests sequentially. 511 * We do it this way to keep from flooding NFS servers if we are connected 512 * to an NFS file. This places the burden on the client rather than the 513 * server. 514 */ 515 void 516 vndstart(vnd) 517 struct vnd_softc *vnd; 518 { 519 struct buf *bp; 520 521 /* 522 * Dequeue now since lower level strategy routine might 523 * queue using same links 524 */ 525 526 if ((vnd->sc_flags & VNF_BUSY) != 0) 527 return; 528 529 vnd->sc_flags |= VNF_BUSY; 530 531 while (vnd->sc_active < vnd->sc_maxactive) { 532 bp = BUFQ_FIRST(&vnd->sc_tab); 533 if (bp == NULL) 534 break; 535 BUFQ_REMOVE(&vnd->sc_tab, bp); 536 vnd->sc_active++; 537 #ifdef DEBUG 538 if (vnddebug & VDB_IO) 539 printf("vndstart(%ld): bp %p vp %p blkno 0x%x addr %p cnt 0x%lx\n", 540 (long) (vnd-vnd_softc), bp, bp->b_vp, bp->b_blkno, 541 bp->b_data, bp->b_bcount); 542 #endif 543 544 /* Instrumentation. */ 545 disk_busy(&vnd->sc_dkdev); 546 547 if ((bp->b_flags & B_READ) == 0) 548 bp->b_vp->v_numoutput++; 549 VOP_STRATEGY(bp); 550 } 551 vnd->sc_flags &= ~VNF_BUSY; 552 } 553 554 void 555 vndiodone(bp) 556 struct buf *bp; 557 { 558 struct vndbuf *vbp = (struct vndbuf *) bp; 559 struct vndxfer *vnx = (struct vndxfer *)vbp->vb_xfer; 560 struct buf *pbp = vnx->vx_bp; 561 struct vnd_softc *vnd = &vnd_softc[vndunit(pbp->b_dev)]; 562 int s, resid; 563 564 s = splbio(); 565 #ifdef DEBUG 566 if (vnddebug & VDB_IO) 567 printf("vndiodone(%ld): vbp %p vp %p blkno 0x%x addr %p cnt 0x%lx\n", 568 (long) (vnd-vnd_softc), vbp, vbp->vb_buf.b_vp, 569 vbp->vb_buf.b_blkno, vbp->vb_buf.b_data, 570 vbp->vb_buf.b_bcount); 571 #endif 572 573 resid = vbp->vb_buf.b_bcount - vbp->vb_buf.b_resid; 574 pbp->b_resid -= resid; 575 disk_unbusy(&vnd->sc_dkdev, resid); 576 vnx->vx_pending--; 577 578 if (vbp->vb_buf.b_error) { 579 #ifdef DEBUG 580 if (vnddebug & VDB_IO) 581 printf("vndiodone: vbp %p error %d\n", vbp, 582 vbp->vb_buf.b_error); 583 #endif 584 vnx->vx_error = vbp->vb_buf.b_error; 585 } 586 587 if (vbp->vb_buf.b_vp != NULLVP) 588 brelvp(&vbp->vb_buf); 589 590 VND_PUTBUF(vnd, vbp); 591 592 /* 593 * Wrap up this transaction if it has run to completion or, in 594 * case of an error, when all auxiliary buffers have returned. 595 */ 596 if (vnx->vx_error != 0) { 597 pbp->b_flags |= B_ERROR; 598 pbp->b_error = vnx->vx_error; 599 if ((vnx->vx_flags & VX_BUSY) == 0 && vnx->vx_pending == 0) { 600 601 #ifdef DEBUG 602 if (vnddebug & VDB_IO) 603 printf("vndiodone: pbp %p iodone: error %d\n", 604 pbp, vnx->vx_error); 605 #endif 606 VND_PUTXFER(vnd, vnx); 607 biodone(pbp); 608 } 609 } else if (pbp->b_resid == 0) { 610 611 #ifdef DIAGNOSTIC 612 if (vnx->vx_pending != 0) 613 panic("vndiodone: vnx pending: %d", vnx->vx_pending); 614 #endif 615 616 if ((vnx->vx_flags & VX_BUSY) == 0) { 617 #ifdef DEBUG 618 if (vnddebug & VDB_IO) 619 printf("vndiodone: pbp %p iodone\n", pbp); 620 #endif 621 VND_PUTXFER(vnd, vnx); 622 biodone(pbp); 623 } 624 } 625 626 vnd->sc_active--; 627 vndstart(vnd); 628 splx(s); 629 } 630 631 /* ARGSUSED */ 632 int 633 vndread(dev, uio, flags) 634 dev_t dev; 635 struct uio *uio; 636 int flags; 637 { 638 int unit = vndunit(dev); 639 struct vnd_softc *sc; 640 641 #ifdef DEBUG 642 if (vnddebug & VDB_FOLLOW) 643 printf("vndread(0x%x, %p)\n", dev, uio); 644 #endif 645 646 if (unit >= numvnd) 647 return (ENXIO); 648 sc = &vnd_softc[unit]; 649 650 if ((sc->sc_flags & VNF_INITED) == 0) 651 return (ENXIO); 652 653 return (physio(vndstrategy, NULL, dev, B_READ, minphys, uio)); 654 } 655 656 /* ARGSUSED */ 657 int 658 vndwrite(dev, uio, flags) 659 dev_t dev; 660 struct uio *uio; 661 int flags; 662 { 663 int unit = vndunit(dev); 664 struct vnd_softc *sc; 665 666 #ifdef DEBUG 667 if (vnddebug & VDB_FOLLOW) 668 printf("vndwrite(0x%x, %p)\n", dev, uio); 669 #endif 670 671 if (unit >= numvnd) 672 return (ENXIO); 673 sc = &vnd_softc[unit]; 674 675 if ((sc->sc_flags & VNF_INITED) == 0) 676 return (ENXIO); 677 678 return (physio(vndstrategy, NULL, dev, B_WRITE, minphys, uio)); 679 } 680 681 /* ARGSUSED */ 682 int 683 vndioctl(dev, cmd, data, flag, p) 684 dev_t dev; 685 u_long cmd; 686 caddr_t data; 687 int flag; 688 struct proc *p; 689 { 690 int unit = vndunit(dev); 691 struct vnd_softc *vnd; 692 struct vnd_ioctl *vio; 693 struct vattr vattr; 694 struct nameidata nd; 695 int error, part, pmask; 696 size_t geomsize; 697 698 #ifdef DEBUG 699 if (vnddebug & VDB_FOLLOW) 700 printf("vndioctl(0x%x, 0x%lx, %p, 0x%x, %p): unit %d\n", 701 dev, cmd, data, flag, p, unit); 702 #endif 703 error = suser(p->p_ucred, &p->p_acflag); 704 if (error) 705 return (error); 706 if (unit >= numvnd) 707 return (ENXIO); 708 709 vnd = &vnd_softc[unit]; 710 vio = (struct vnd_ioctl *)data; 711 712 /* Must be open for writes for these commands... */ 713 switch (cmd) { 714 case VNDIOCSET: 715 case VNDIOCCLR: 716 case DIOCSDINFO: 717 case DIOCWDINFO: 718 case DIOCWLABEL: 719 if ((flag & FWRITE) == 0) 720 return (EBADF); 721 } 722 723 /* Must be initialized for these... */ 724 switch (cmd) { 725 case VNDIOCCLR: 726 case DIOCGDINFO: 727 case DIOCSDINFO: 728 case DIOCWDINFO: 729 case DIOCGPART: 730 case DIOCWLABEL: 731 case DIOCGDEFLABEL: 732 if ((vnd->sc_flags & VNF_INITED) == 0) 733 return (ENXIO); 734 } 735 736 switch (cmd) { 737 case VNDIOCSET: 738 if (vnd->sc_flags & VNF_INITED) 739 return (EBUSY); 740 741 if ((error = vndlock(vnd)) != 0) 742 return (error); 743 744 /* 745 * Always open for read and write. 746 * This is probably bogus, but it lets vn_open() 747 * weed out directories, sockets, etc. so we don't 748 * have to worry about them. 749 */ 750 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, vio->vnd_file, p); 751 if ((error = vn_open(&nd, FREAD|FWRITE, 0)) != 0) { 752 vndunlock(vnd); 753 return(error); 754 } 755 error = VOP_GETATTR(nd.ni_vp, &vattr, p->p_ucred, p); 756 if (error) { 757 VOP_UNLOCK(nd.ni_vp, 0); 758 (void) vn_close(nd.ni_vp, FREAD|FWRITE, p->p_ucred, p); 759 vndunlock(vnd); 760 return(error); 761 } 762 VOP_UNLOCK(nd.ni_vp, 0); 763 vnd->sc_vp = nd.ni_vp; 764 vnd->sc_size = btodb(vattr.va_size); /* note truncation */ 765 766 /* 767 * Use pseudo-geometry specified. If none was provided, 768 * use "standard" Adaptec fictitious geometry. 769 */ 770 if (vio->vnd_flags & VNDIOF_HASGEOM) { 771 772 bcopy(&vio->vnd_geom, &vnd->sc_geom, 773 sizeof(vio->vnd_geom)); 774 775 /* 776 * Sanity-check the sector size. 777 * XXX Don't allow secsize < DEV_BSIZE. Should 778 * XXX we? 779 */ 780 if (vnd->sc_geom.vng_secsize < DEV_BSIZE || 781 (vnd->sc_geom.vng_secsize % DEV_BSIZE) != 0) { 782 (void) vn_close(nd.ni_vp, FREAD|FWRITE, 783 p->p_ucred, p); 784 vndunlock(vnd); 785 return (EINVAL); 786 } 787 788 /* 789 * Compute the size (in DEV_BSIZE blocks) specified 790 * by the geometry. 791 */ 792 geomsize = (vnd->sc_geom.vng_nsectors * 793 vnd->sc_geom.vng_ntracks * 794 vnd->sc_geom.vng_ncylinders) * 795 (vnd->sc_geom.vng_secsize / DEV_BSIZE); 796 797 /* 798 * Sanity-check the size against the specified 799 * geometry. 800 */ 801 if (vnd->sc_size < geomsize) { 802 (void) vn_close(nd.ni_vp, FREAD|FWRITE, 803 p->p_ucred, p); 804 vndunlock(vnd); 805 return (EINVAL); 806 } 807 } else { 808 /* 809 * Size must be at least 2048 DEV_BSIZE blocks 810 * (1M) in order to use this geometry. 811 */ 812 if (vnd->sc_size < (32 * 64)) { 813 vndunlock(vnd); 814 return (EINVAL); 815 } 816 817 vnd->sc_geom.vng_secsize = DEV_BSIZE; 818 vnd->sc_geom.vng_nsectors = 32; 819 vnd->sc_geom.vng_ntracks = 64; 820 vnd->sc_geom.vng_ncylinders = vnd->sc_size / (64 * 32); 821 822 /* 823 * Compute the actual size allowed by this geometry. 824 */ 825 geomsize = 32 * 64 * vnd->sc_geom.vng_ncylinders; 826 } 827 828 /* 829 * Truncate the size to that specified by 830 * the geometry. 831 * XXX Should we even bother with this? 832 */ 833 vnd->sc_size = geomsize; 834 835 if ((error = vndsetcred(vnd, p->p_ucred)) != 0) { 836 (void) vn_close(nd.ni_vp, FREAD|FWRITE, p->p_ucred, p); 837 vndunlock(vnd); 838 return(error); 839 } 840 vndthrottle(vnd, vnd->sc_vp); 841 vio->vnd_size = dbtob(vnd->sc_size); 842 vnd->sc_flags |= VNF_INITED; 843 #ifdef DEBUG 844 if (vnddebug & VDB_INIT) 845 printf("vndioctl: SET vp %p size 0x%lx %d/%d/%d/%d\n", 846 vnd->sc_vp, (unsigned long) vnd->sc_size, 847 vnd->sc_geom.vng_secsize, 848 vnd->sc_geom.vng_nsectors, 849 vnd->sc_geom.vng_ntracks, 850 vnd->sc_geom.vng_ncylinders); 851 #endif 852 853 /* Attach the disk. */ 854 bzero(vnd->sc_xname, sizeof(vnd->sc_xname)); /* XXX */ 855 sprintf(vnd->sc_xname, "vnd%d", unit); /* XXX */ 856 vnd->sc_dkdev.dk_name = vnd->sc_xname; 857 disk_attach(&vnd->sc_dkdev); 858 859 /* Initialize the xfer and buffer pools. */ 860 pool_init(&vnd->sc_vxpool, sizeof(struct vndxfer), 0, 861 0, 0, "vndxpl", 0, NULL, NULL, M_DEVBUF); 862 pool_init(&vnd->sc_vbpool, sizeof(struct vndbuf), 0, 863 0, 0, "vndbpl", 0, NULL, NULL, M_DEVBUF); 864 865 /* Try and read the disklabel. */ 866 vndgetdisklabel(dev); 867 868 vndunlock(vnd); 869 870 break; 871 872 case VNDIOCCLR: 873 if ((error = vndlock(vnd)) != 0) 874 return (error); 875 876 /* 877 * Don't unconfigure if any other partitions are open 878 * or if both the character and block flavors of this 879 * partition are open. 880 */ 881 part = DISKPART(dev); 882 pmask = (1 << part); 883 if ((vnd->sc_dkdev.dk_openmask & ~pmask) || 884 ((vnd->sc_dkdev.dk_bopenmask & pmask) && 885 (vnd->sc_dkdev.dk_copenmask & pmask))) { 886 vndunlock(vnd); 887 return (EBUSY); 888 } 889 890 vndclear(vnd); 891 #ifdef DEBUG 892 if (vnddebug & VDB_INIT) 893 printf("vndioctl: CLRed\n"); 894 #endif 895 896 /* Destroy the xfer and buffer pools. */ 897 pool_destroy(&vnd->sc_vxpool); 898 pool_destroy(&vnd->sc_vbpool); 899 900 /* Detatch the disk. */ 901 disk_detach(&vnd->sc_dkdev); 902 903 vndunlock(vnd); 904 905 break; 906 907 case DIOCGDINFO: 908 *(struct disklabel *)data = *(vnd->sc_dkdev.dk_label); 909 break; 910 911 case DIOCGPART: 912 ((struct partinfo *)data)->disklab = vnd->sc_dkdev.dk_label; 913 ((struct partinfo *)data)->part = 914 &vnd->sc_dkdev.dk_label->d_partitions[DISKPART(dev)]; 915 break; 916 917 case DIOCWDINFO: 918 case DIOCSDINFO: 919 if ((error = vndlock(vnd)) != 0) 920 return (error); 921 922 vnd->sc_flags |= VNF_LABELLING; 923 924 error = setdisklabel(vnd->sc_dkdev.dk_label, 925 (struct disklabel *)data, 0, vnd->sc_dkdev.dk_cpulabel); 926 if (error == 0) { 927 if (cmd == DIOCWDINFO) 928 error = writedisklabel(VNDLABELDEV(dev), 929 vndstrategy, vnd->sc_dkdev.dk_label, 930 vnd->sc_dkdev.dk_cpulabel); 931 } 932 933 vnd->sc_flags &= ~VNF_LABELLING; 934 935 vndunlock(vnd); 936 937 if (error) 938 return (error); 939 break; 940 941 case DIOCWLABEL: 942 if (*(int *)data != 0) 943 vnd->sc_flags |= VNF_WLABEL; 944 else 945 vnd->sc_flags &= ~VNF_WLABEL; 946 break; 947 948 case DIOCGDEFLABEL: 949 vndgetdefaultlabel(vnd, (struct disklabel *)data); 950 break; 951 952 default: 953 return (ENOTTY); 954 } 955 956 return (0); 957 } 958 959 /* 960 * Duplicate the current processes' credentials. Since we are called only 961 * as the result of a SET ioctl and only root can do that, any future access 962 * to this "disk" is essentially as root. Note that credentials may change 963 * if some other uid can write directly to the mapped file (NFS). 964 */ 965 int 966 vndsetcred(vnd, cred) 967 struct vnd_softc *vnd; 968 struct ucred *cred; 969 { 970 struct uio auio; 971 struct iovec aiov; 972 char *tmpbuf; 973 int error; 974 975 vnd->sc_cred = crdup(cred); 976 tmpbuf = malloc(DEV_BSIZE, M_TEMP, M_WAITOK); 977 978 /* XXX: Horrible kludge to establish credentials for NFS */ 979 aiov.iov_base = tmpbuf; 980 aiov.iov_len = min(DEV_BSIZE, dbtob(vnd->sc_size)); 981 auio.uio_iov = &aiov; 982 auio.uio_iovcnt = 1; 983 auio.uio_offset = 0; 984 auio.uio_rw = UIO_READ; 985 auio.uio_segflg = UIO_SYSSPACE; 986 auio.uio_resid = aiov.iov_len; 987 vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); 988 error = VOP_READ(vnd->sc_vp, &auio, 0, vnd->sc_cred); 989 if (error == 0) { 990 /* 991 * Because vnd does all IO directly through the vnode 992 * we need to flush (at least) the buffer from the above 993 * VOP_READ from the buffer cache to prevent cache 994 * incoherencies. Also, be careful to write dirty 995 * buffers back to stable storage. 996 */ 997 error = vinvalbuf(vnd->sc_vp, V_SAVE, vnd->sc_cred, 998 curproc, 0, 0); 999 } 1000 VOP_UNLOCK(vnd->sc_vp, 0); 1001 1002 free(tmpbuf, M_TEMP); 1003 return (error); 1004 } 1005 1006 /* 1007 * Set maxactive based on FS type 1008 */ 1009 void 1010 vndthrottle(vnd, vp) 1011 struct vnd_softc *vnd; 1012 struct vnode *vp; 1013 { 1014 #ifdef NFS 1015 extern int (**nfsv2_vnodeop_p) __P((void *)); 1016 1017 if (vp->v_op == nfsv2_vnodeop_p) 1018 vnd->sc_maxactive = 2; 1019 else 1020 #endif 1021 vnd->sc_maxactive = 8; 1022 1023 if (vnd->sc_maxactive < 1) 1024 vnd->sc_maxactive = 1; 1025 } 1026 1027 void 1028 vndshutdown() 1029 { 1030 struct vnd_softc *vnd; 1031 1032 for (vnd = &vnd_softc[0]; vnd < &vnd_softc[numvnd]; vnd++) 1033 if (vnd->sc_flags & VNF_INITED) 1034 vndclear(vnd); 1035 } 1036 1037 void 1038 vndclear(vnd) 1039 struct vnd_softc *vnd; 1040 { 1041 struct vnode *vp = vnd->sc_vp; 1042 struct proc *p = curproc; /* XXX */ 1043 1044 #ifdef DEBUG 1045 if (vnddebug & VDB_FOLLOW) 1046 printf("vndclear(%p): vp %p\n", vnd, vp); 1047 #endif 1048 vnd->sc_flags &= ~VNF_INITED; 1049 if (vp == (struct vnode *)0) 1050 panic("vndioctl: null vp"); 1051 (void) vn_close(vp, FREAD|FWRITE, vnd->sc_cred, p); 1052 crfree(vnd->sc_cred); 1053 vnd->sc_vp = (struct vnode *)0; 1054 vnd->sc_cred = (struct ucred *)0; 1055 vnd->sc_size = 0; 1056 } 1057 1058 int 1059 vndsize(dev) 1060 dev_t dev; 1061 { 1062 struct vnd_softc *sc; 1063 struct disklabel *lp; 1064 int part, unit, omask; 1065 int size; 1066 1067 unit = vndunit(dev); 1068 if (unit >= numvnd) 1069 return (-1); 1070 sc = &vnd_softc[unit]; 1071 1072 if ((sc->sc_flags & VNF_INITED) == 0) 1073 return (-1); 1074 1075 part = DISKPART(dev); 1076 omask = sc->sc_dkdev.dk_openmask & (1 << part); 1077 lp = sc->sc_dkdev.dk_label; 1078 1079 if (omask == 0 && vndopen(dev, 0, S_IFBLK, curproc)) 1080 return (-1); 1081 1082 if (lp->d_partitions[part].p_fstype != FS_SWAP) 1083 size = -1; 1084 else 1085 size = lp->d_partitions[part].p_size * 1086 (lp->d_secsize / DEV_BSIZE); 1087 1088 if (omask == 0 && vndclose(dev, 0, S_IFBLK, curproc)) 1089 return (-1); 1090 1091 return (size); 1092 } 1093 1094 int 1095 vnddump(dev, blkno, va, size) 1096 dev_t dev; 1097 daddr_t blkno; 1098 caddr_t va; 1099 size_t size; 1100 { 1101 1102 /* Not implemented. */ 1103 return ENXIO; 1104 } 1105 1106 void 1107 vndgetdefaultlabel(sc, lp) 1108 struct vnd_softc *sc; 1109 struct disklabel *lp; 1110 { 1111 struct vndgeom *vng = &sc->sc_geom; 1112 struct partition *pp; 1113 1114 bzero(lp, sizeof(*lp)); 1115 1116 lp->d_secperunit = sc->sc_size / (vng->vng_secsize / DEV_BSIZE); 1117 lp->d_secsize = vng->vng_secsize; 1118 lp->d_nsectors = vng->vng_nsectors; 1119 lp->d_ntracks = vng->vng_ntracks; 1120 lp->d_ncylinders = vng->vng_ncylinders; 1121 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 1122 1123 strncpy(lp->d_typename, "vnd", sizeof(lp->d_typename)); 1124 lp->d_type = DTYPE_VND; 1125 strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname)); 1126 lp->d_rpm = 3600; 1127 lp->d_interleave = 1; 1128 lp->d_flags = 0; 1129 1130 pp = &lp->d_partitions[RAW_PART]; 1131 pp->p_offset = 0; 1132 pp->p_size = lp->d_secperunit; 1133 pp->p_fstype = FS_UNUSED; 1134 lp->d_npartitions = RAW_PART + 1; 1135 1136 lp->d_magic = DISKMAGIC; 1137 lp->d_magic2 = DISKMAGIC; 1138 lp->d_checksum = dkcksum(lp); 1139 } 1140 1141 /* 1142 * Read the disklabel from a vnd. If one is not present, create a fake one. 1143 */ 1144 void 1145 vndgetdisklabel(dev) 1146 dev_t dev; 1147 { 1148 struct vnd_softc *sc = &vnd_softc[vndunit(dev)]; 1149 char *errstring; 1150 struct disklabel *lp = sc->sc_dkdev.dk_label; 1151 struct cpu_disklabel *clp = sc->sc_dkdev.dk_cpulabel; 1152 int i; 1153 1154 bzero(clp, sizeof(*clp)); 1155 1156 vndgetdefaultlabel(sc, lp); 1157 1158 /* 1159 * Call the generic disklabel extraction routine. 1160 */ 1161 errstring = readdisklabel(VNDLABELDEV(dev), vndstrategy, lp, clp); 1162 if (errstring) { 1163 /* 1164 * Lack of disklabel is common, but we print the warning 1165 * anyway, since it might contain other useful information. 1166 */ 1167 printf("%s: %s\n", sc->sc_xname, errstring); 1168 1169 /* 1170 * For historical reasons, if there's no disklabel 1171 * present, all partitions must be FS_BSDFFS and 1172 * occupy the entire disk. 1173 */ 1174 for (i = 0; i < MAXPARTITIONS; i++) { 1175 /* 1176 * Don't wipe out port specific hack (such as 1177 * dos partition hack of i386 port). 1178 */ 1179 if (lp->d_partitions[i].p_fstype != FS_UNUSED) 1180 continue; 1181 1182 lp->d_partitions[i].p_size = lp->d_secperunit; 1183 lp->d_partitions[i].p_offset = 0; 1184 lp->d_partitions[i].p_fstype = FS_BSDFFS; 1185 } 1186 1187 strncpy(lp->d_packname, "default label", 1188 sizeof(lp->d_packname)); 1189 1190 lp->d_checksum = dkcksum(lp); 1191 } 1192 } 1193 1194 /* 1195 * Wait interruptibly for an exclusive lock. 1196 * 1197 * XXX 1198 * Several drivers do this; it should be abstracted and made MP-safe. 1199 */ 1200 static int 1201 vndlock(sc) 1202 struct vnd_softc *sc; 1203 { 1204 int error; 1205 1206 while ((sc->sc_flags & VNF_LOCKED) != 0) { 1207 sc->sc_flags |= VNF_WANTED; 1208 if ((error = tsleep(sc, PRIBIO | PCATCH, "vndlck", 0)) != 0) 1209 return (error); 1210 } 1211 sc->sc_flags |= VNF_LOCKED; 1212 return (0); 1213 } 1214 1215 /* 1216 * Unlock and wake up any waiters. 1217 */ 1218 static void 1219 vndunlock(sc) 1220 struct vnd_softc *sc; 1221 { 1222 1223 sc->sc_flags &= ~VNF_LOCKED; 1224 if ((sc->sc_flags & VNF_WANTED) != 0) { 1225 sc->sc_flags &= ~VNF_WANTED; 1226 wakeup(sc); 1227 } 1228 } 1229