1 /* 2 * ---------------------------------------------------------------------------- 3 * "THE BEER-WARE LICENSE" (Revision 42): 4 * <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you 5 * can do whatever you want with this stuff. If we meet some day, and you think 6 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 7 * ---------------------------------------------------------------------------- 8 * 9 * $FreeBSD$ 10 * 11 */ 12 13 /* 14 * The following functions are based in the vn(4) driver: mdstart_swap(), 15 * mdstart_vnode(), mdcreate_swap(), mdcreate_vnode() and mddestroy(), 16 * and as such under the following copyright: 17 * 18 * Copyright (c) 1988 University of Utah. 19 * Copyright (c) 1990, 1993 20 * The Regents of the University of California. All rights reserved. 21 * 22 * This code is derived from software contributed to Berkeley by 23 * the Systems Programming Group of the University of Utah Computer 24 * Science Department. 25 * 26 * Redistribution and use in source and binary forms, with or without 27 * modification, are permitted provided that the following conditions 28 * are met: 29 * 1. Redistributions of source code must retain the above copyright 30 * notice, this list of conditions and the following disclaimer. 31 * 2. Redistributions in binary form must reproduce the above copyright 32 * notice, this list of conditions and the following disclaimer in the 33 * documentation and/or other materials provided with the distribution. 34 * 3. All advertising materials mentioning features or use of this software 35 * must display the following acknowledgement: 36 * This product includes software developed by the University of 37 * California, Berkeley and its contributors. 38 * 4. Neither the name of the University nor the names of its contributors 39 * may be used to endorse or promote products derived from this software 40 * without specific prior written permission. 41 * 42 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 43 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 44 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 45 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 46 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 47 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 48 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 49 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 50 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 51 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 52 * SUCH DAMAGE. 53 * 54 * from: Utah Hdr: vn.c 1.13 94/04/02 55 * 56 * from: @(#)vn.c 8.6 (Berkeley) 4/1/94 57 * From: src/sys/dev/vn/vn.c,v 1.122 2000/12/16 16:06:03 58 */ 59 60 #include "opt_mfs.h" /* We have adopted some tasks from MFS */ 61 #include "opt_md.h" 62 63 #include <sys/param.h> 64 #include <sys/systm.h> 65 #include <sys/bio.h> 66 #include <sys/conf.h> 67 #include <sys/devicestat.h> 68 #include <sys/disk.h> 69 #include <sys/kernel.h> 70 #include <sys/malloc.h> 71 #include <sys/sysctl.h> 72 #include <sys/linker.h> 73 #include <sys/queue.h> 74 #include <sys/mdioctl.h> 75 #include <sys/vnode.h> 76 #include <sys/namei.h> 77 #include <sys/fcntl.h> 78 #include <sys/proc.h> 79 #include <machine/atomic.h> 80 81 #include <vm/vm.h> 82 #include <vm/vm_object.h> 83 #include <vm/vm_page.h> 84 #include <vm/vm_pager.h> 85 #include <vm/vm_zone.h> 86 #include <vm/swap_pager.h> 87 88 #ifndef MD_NSECT 89 #define MD_NSECT (10000 * 2) 90 #endif 91 92 MALLOC_DEFINE(M_MD, "MD disk", "Memory Disk"); 93 MALLOC_DEFINE(M_MDSECT, "MD sectors", "Memory Disk Sectors"); 94 95 static int md_debug; 96 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, ""); 97 98 #if defined(MFS_ROOT) && !defined(MD_ROOT) 99 #define MD_ROOT MFS_ROOT 100 #warning "option MFS_ROOT has been superceeded by MD_ROOT" 101 #endif 102 103 #if defined(MFS_ROOT_SIZE) && !defined(MD_ROOT_SIZE) 104 #define MD_ROOT_SIZE MFS_ROOT_SIZE 105 #warning "option MFS_ROOT_SIZE has been superceeded by MD_ROOT_SIZE" 106 #endif 107 108 #if defined(MD_ROOT) && defined(MD_ROOT_SIZE) 109 /* Image gets put here: */ 110 static u_char mfs_root[MD_ROOT_SIZE*1024] = "MFS Filesystem goes here"; 111 static u_char end_mfs_root[] __unused = "MFS Filesystem had better STOP here"; 112 #endif 113 114 static int mdrootready; 115 static int mdunits; 116 117 #define CDEV_MAJOR 95 118 119 static d_strategy_t mdstrategy; 120 static d_open_t mdopen; 121 static d_ioctl_t mdioctl, mdctlioctl; 122 123 static struct cdevsw md_cdevsw = { 124 /* open */ mdopen, 125 /* close */ nullclose, 126 /* read */ physread, 127 /* write */ physwrite, 128 /* ioctl */ mdioctl, 129 /* poll */ nopoll, 130 /* mmap */ nommap, 131 /* strategy */ mdstrategy, 132 /* name */ "md", 133 /* maj */ CDEV_MAJOR, 134 /* dump */ nodump, 135 /* psize */ nopsize, 136 /* flags */ D_DISK | D_CANFREE | D_MEMDISK, 137 }; 138 139 static struct cdevsw mdctl_cdevsw = { 140 /* open */ nullopen, 141 /* close */ nullclose, 142 /* read */ noread, 143 /* write */ nowrite, 144 /* ioctl */ mdctlioctl, 145 /* poll */ nopoll, 146 /* mmap */ nommap, 147 /* strategy */ nostrategy, 148 /* name */ "md", 149 /* maj */ CDEV_MAJOR 150 }; 151 152 static struct cdevsw mddisk_cdevsw; 153 154 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(&md_softc_list); 155 156 struct md_s { 157 int unit; 158 LIST_ENTRY(md_s) list; 159 struct devstat stats; 160 struct bio_queue_head bio_queue; 161 struct disk disk; 162 dev_t dev; 163 int busy; 164 enum md_types type; 165 unsigned nsect; 166 unsigned secsize; 167 unsigned flags; 168 169 /* MD_MALLOC related fields */ 170 u_char **secp; 171 172 /* MD_PRELOAD related fields */ 173 u_char *pl_ptr; 174 unsigned pl_len; 175 176 /* MD_VNODE related fields */ 177 struct vnode *vnode; 178 struct ucred *cred; 179 180 /* MD_OBJET related fields */ 181 vm_object_t object; 182 }; 183 184 static int 185 mdopen(dev_t dev, int flag, int fmt, struct proc *p) 186 { 187 struct md_s *sc; 188 struct disklabel *dl; 189 190 if (md_debug) 191 printf("mdopen(%s %x %x %p)\n", 192 devtoname(dev), flag, fmt, p); 193 194 sc = dev->si_drv1; 195 196 dl = &sc->disk.d_label; 197 bzero(dl, sizeof(*dl)); 198 dl->d_secsize = sc->secsize; 199 dl->d_nsectors = sc->nsect > 1024 ? 1024 : sc->nsect; 200 dl->d_ntracks = 1; 201 dl->d_secpercyl = dl->d_nsectors * dl->d_ntracks; 202 dl->d_secperunit = sc->nsect; 203 dl->d_ncylinders = dl->d_secperunit / dl->d_secpercyl; 204 return (0); 205 } 206 207 static int 208 mdioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct proc *p) 209 { 210 211 if (md_debug) 212 printf("mdioctl(%s %lx %p %x %p)\n", 213 devtoname(dev), cmd, addr, flags, p); 214 215 return (ENOIOCTL); 216 } 217 218 static void 219 mdstart_malloc(struct md_s *sc) 220 { 221 int i; 222 struct bio *bp; 223 devstat_trans_flags dop; 224 u_char *secp, **secpp, *dst; 225 unsigned secno, nsec, secval, uc; 226 227 for (;;) { 228 /* XXX: LOCK(unique unit numbers) */ 229 bp = bioq_first(&sc->bio_queue); 230 if (bp) 231 bioq_remove(&sc->bio_queue, bp); 232 /* XXX: UNLOCK(unique unit numbers) */ 233 if (!bp) 234 break; 235 236 devstat_start_transaction(&sc->stats); 237 238 if (bp->bio_cmd == BIO_DELETE) 239 dop = DEVSTAT_NO_DATA; 240 else if (bp->bio_cmd == BIO_READ) 241 dop = DEVSTAT_READ; 242 else 243 dop = DEVSTAT_WRITE; 244 245 nsec = bp->bio_bcount / sc->secsize; 246 secno = bp->bio_pblkno; 247 dst = bp->bio_data; 248 while (nsec--) { 249 secpp = &sc->secp[secno]; 250 if ((uintptr_t)*secpp > 255) { 251 secp = *secpp; 252 secval = 0; 253 } else { 254 secp = NULL; 255 secval = (uintptr_t) *secpp; 256 } 257 258 if (md_debug > 2) 259 printf("%x %p %p %d\n", 260 bp->bio_flags, secpp, secp, secval); 261 262 if (bp->bio_cmd == BIO_DELETE) { 263 if (!(sc->flags & MD_RESERVE) && secp != NULL) { 264 FREE(secp, M_MDSECT); 265 *secpp = 0; 266 } 267 } else if (bp->bio_cmd == BIO_READ) { 268 if (secp != NULL) { 269 bcopy(secp, dst, sc->secsize); 270 } else if (secval) { 271 for (i = 0; i < sc->secsize; i++) 272 dst[i] = secval; 273 } else { 274 bzero(dst, sc->secsize); 275 } 276 } else { 277 if (sc->flags & MD_COMPRESS) { 278 uc = dst[0]; 279 for (i = 1; i < sc->secsize; i++) 280 if (dst[i] != uc) 281 break; 282 } else { 283 i = 0; 284 uc = 0; 285 } 286 if (i == sc->secsize) { 287 if (secp) 288 FREE(secp, M_MDSECT); 289 *secpp = (u_char *)(uintptr_t)uc; 290 } else { 291 if (secp == NULL) 292 MALLOC(secp, u_char *, sc->secsize, M_MDSECT, M_WAITOK); 293 bcopy(dst, secp, sc->secsize); 294 *secpp = secp; 295 } 296 } 297 secno++; 298 dst += sc->secsize; 299 } 300 bp->bio_resid = 0; 301 devstat_end_transaction_bio(&sc->stats, bp); 302 biodone(bp); 303 } 304 return; 305 } 306 307 308 static void 309 mdstart_preload(struct md_s *sc) 310 { 311 struct bio *bp; 312 devstat_trans_flags dop; 313 314 for (;;) { 315 /* XXX: LOCK(unique unit numbers) */ 316 bp = bioq_first(&sc->bio_queue); 317 if (bp) 318 bioq_remove(&sc->bio_queue, bp); 319 /* XXX: UNLOCK(unique unit numbers) */ 320 if (!bp) 321 break; 322 323 devstat_start_transaction(&sc->stats); 324 325 if (bp->bio_cmd == BIO_DELETE) { 326 dop = DEVSTAT_NO_DATA; 327 } else if (bp->bio_cmd == BIO_READ) { 328 dop = DEVSTAT_READ; 329 bcopy(sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_data, bp->bio_bcount); 330 } else { 331 dop = DEVSTAT_WRITE; 332 bcopy(bp->bio_data, sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_bcount); 333 } 334 bp->bio_resid = 0; 335 devstat_end_transaction_bio(&sc->stats, bp); 336 biodone(bp); 337 } 338 return; 339 } 340 341 static void 342 mdstart_vnode(struct md_s *sc) 343 { 344 int error; 345 struct bio *bp; 346 struct uio auio; 347 struct iovec aiov; 348 struct mount *mp; 349 350 /* 351 * VNODE I/O 352 * 353 * If an error occurs, we set BIO_ERROR but we do not set 354 * B_INVAL because (for a write anyway), the buffer is 355 * still valid. 356 */ 357 358 for (;;) { 359 /* XXX: LOCK(unique unit numbers) */ 360 bp = bioq_first(&sc->bio_queue); 361 if (bp) 362 bioq_remove(&sc->bio_queue, bp); 363 /* XXX: UNLOCK(unique unit numbers) */ 364 if (!bp) 365 break; 366 367 devstat_start_transaction(&sc->stats); 368 369 bzero(&auio, sizeof(auio)); 370 371 aiov.iov_base = bp->bio_data; 372 aiov.iov_len = bp->bio_bcount; 373 auio.uio_iov = &aiov; 374 auio.uio_iovcnt = 1; 375 auio.uio_offset = (vm_ooffset_t)bp->bio_pblkno * sc->secsize; 376 auio.uio_segflg = UIO_SYSSPACE; 377 if(bp->bio_cmd == BIO_READ) 378 auio.uio_rw = UIO_READ; 379 else 380 auio.uio_rw = UIO_WRITE; 381 auio.uio_resid = bp->bio_bcount; 382 auio.uio_procp = curproc; 383 if (VOP_ISLOCKED(sc->vnode, NULL)) 384 vprint("unexpected vn driver lock", sc->vnode); 385 if (bp->bio_cmd == BIO_READ) { 386 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curproc); 387 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 388 } else { 389 (void) vn_start_write(sc->vnode, &mp, V_WAIT); 390 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curproc); 391 error = VOP_WRITE(sc->vnode, &auio, 0, sc->cred); 392 vn_finished_write(mp); 393 } 394 VOP_UNLOCK(sc->vnode, 0, curproc); 395 bp->bio_resid = auio.uio_resid; 396 397 if (error) { 398 bp->bio_error = error; 399 bp->bio_flags |= BIO_ERROR; 400 } 401 devstat_end_transaction_bio(&sc->stats, bp); 402 biodone(bp); 403 } 404 return; 405 } 406 407 static void 408 mdstart_swap(struct md_s *sc) 409 { 410 struct bio *bp; 411 412 for (;;) { 413 /* XXX: LOCK(unique unit numbers) */ 414 bp = bioq_first(&sc->bio_queue); 415 if (bp) 416 bioq_remove(&sc->bio_queue, bp); 417 /* XXX: UNLOCK(unique unit numbers) */ 418 if (!bp) 419 break; 420 421 #if 0 422 devstat_start_transaction(&sc->stats); 423 #endif 424 425 if ((bp->bio_cmd == BIO_DELETE) && (sc->flags & MD_RESERVE)) 426 biodone(bp); 427 else 428 vm_pager_strategy(sc->object, bp); 429 430 #if 0 431 devstat_end_transaction_bio(&sc->stats, bp); 432 #endif 433 } 434 return; 435 } 436 437 static void 438 mdstrategy(struct bio *bp) 439 { 440 struct md_s *sc; 441 442 if (md_debug > 1) 443 printf("mdstrategy(%p) %s %x, %d, %ld, %p)\n", 444 bp, devtoname(bp->bio_dev), bp->bio_flags, bp->bio_blkno, 445 bp->bio_bcount / DEV_BSIZE, bp->bio_data); 446 447 sc = bp->bio_dev->si_drv1; 448 449 /* XXX: LOCK(sc->lock) */ 450 bioqdisksort(&sc->bio_queue, bp); 451 /* XXX: UNLOCK(sc->lock) */ 452 453 if (atomic_cmpset_int(&sc->busy, 0, 1) == 0) 454 return; 455 456 switch (sc->type) { 457 case MD_MALLOC: 458 mdstart_malloc(sc); 459 break; 460 case MD_PRELOAD: 461 mdstart_preload(sc); 462 break; 463 case MD_VNODE: 464 mdstart_vnode(sc); 465 break; 466 case MD_SWAP: 467 mdstart_swap(sc); 468 break; 469 default: 470 panic("Impossible md(type)"); 471 break; 472 } 473 sc->busy = 0; 474 } 475 476 static struct md_s * 477 mdfind(int unit) 478 { 479 struct md_s *sc; 480 481 /* XXX: LOCK(unique unit numbers) */ 482 LIST_FOREACH(sc, &md_softc_list, list) { 483 if (sc->unit == unit) 484 break; 485 } 486 /* XXX: UNLOCK(unique unit numbers) */ 487 return (sc); 488 } 489 490 static struct md_s * 491 mdnew(int unit) 492 { 493 struct md_s *sc; 494 int max = -1; 495 496 /* XXX: LOCK(unique unit numbers) */ 497 LIST_FOREACH(sc, &md_softc_list, list) { 498 if (sc->unit == unit) { 499 /* XXX: UNLOCK(unique unit numbers) */ 500 return (NULL); 501 } 502 if (sc->unit > max) 503 max = sc->unit; 504 } 505 if (unit == -1) 506 unit = max + 1; 507 if (unit > DKMAXUNIT) 508 return (NULL); 509 MALLOC(sc, struct md_s *,sizeof(*sc), M_MD, M_WAITOK | M_ZERO); 510 sc->unit = unit; 511 LIST_INSERT_HEAD(&md_softc_list, sc, list); 512 /* XXX: UNLOCK(unique unit numbers) */ 513 return (sc); 514 } 515 516 static void 517 mddelete(struct md_s *sc) 518 { 519 520 /* XXX: LOCK(unique unit numbers) */ 521 LIST_REMOVE(sc, list); 522 /* XXX: UNLOCK(unique unit numbers) */ 523 FREE(sc, M_MD); 524 } 525 526 static void 527 mdinit(struct md_s *sc) 528 { 529 530 bioq_init(&sc->bio_queue); 531 devstat_add_entry(&sc->stats, "md", sc->unit, sc->secsize, 532 DEVSTAT_NO_ORDERED_TAGS, 533 DEVSTAT_TYPE_DIRECT | DEVSTAT_TYPE_IF_OTHER, 534 DEVSTAT_PRIORITY_OTHER); 535 sc->dev = disk_create(sc->unit, &sc->disk, 0, &md_cdevsw, &mddisk_cdevsw); 536 sc->dev->si_drv1 = sc; 537 } 538 539 /* 540 * XXX: we should check that the range they feed us is mapped. 541 * XXX: we should implement read-only. 542 */ 543 544 static int 545 mdcreate_preload(struct md_ioctl *mdio) 546 { 547 struct md_s *sc; 548 549 if (mdio->md_size == 0) 550 return(EINVAL); 551 if (mdio->md_options & ~(MD_AUTOUNIT)) 552 return(EINVAL); 553 if (mdio->md_options & MD_AUTOUNIT) { 554 sc = mdnew(-1); 555 if (sc == NULL) 556 return (ENOMEM); 557 mdio->md_unit = sc->unit; 558 } else { 559 sc = mdnew(mdio->md_unit); 560 if (sc == NULL) 561 return (EBUSY); 562 } 563 sc->type = MD_PRELOAD; 564 sc->secsize = DEV_BSIZE; 565 sc->nsect = mdio->md_size; 566 /* Cast to pointer size, then to pointer to avoid warning */ 567 sc->pl_ptr = (u_char *)(uintptr_t)mdio->md_base; 568 sc->pl_len = (mdio->md_size << DEV_BSHIFT); 569 mdinit(sc); 570 return (0); 571 } 572 573 574 static int 575 mdcreate_malloc(struct md_ioctl *mdio) 576 { 577 struct md_s *sc; 578 unsigned u; 579 580 if (mdio->md_size == 0) 581 return(EINVAL); 582 if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 583 return(EINVAL); 584 /* Compression doesn't make sense if we have reserved space */ 585 if (mdio->md_options & MD_RESERVE) 586 mdio->md_options &= ~MD_COMPRESS; 587 if (mdio->md_options & MD_AUTOUNIT) { 588 sc = mdnew(-1); 589 if (sc == NULL) 590 return (ENOMEM); 591 mdio->md_unit = sc->unit; 592 } else { 593 sc = mdnew(mdio->md_unit); 594 if (sc == NULL) 595 return (EBUSY); 596 } 597 sc->type = MD_MALLOC; 598 sc->secsize = DEV_BSIZE; 599 sc->nsect = mdio->md_size; 600 sc->flags = mdio->md_options & MD_COMPRESS; 601 MALLOC(sc->secp, u_char **, sc->nsect * sizeof(u_char *), M_MD, M_WAITOK | M_ZERO); 602 if (mdio->md_options & MD_RESERVE) { 603 for (u = 0; u < sc->nsect; u++) 604 MALLOC(sc->secp[u], u_char *, DEV_BSIZE, M_MDSECT, M_WAITOK | M_ZERO); 605 } 606 printf("md%d: Malloc disk\n", sc->unit); 607 mdinit(sc); 608 return (0); 609 } 610 611 612 static int 613 mdsetcred(struct md_s *sc, struct ucred *cred) 614 { 615 char *tmpbuf; 616 int error = 0; 617 618 /* 619 * Set credits in our softc 620 */ 621 622 if (sc->cred) 623 crfree(sc->cred); 624 sc->cred = crdup(cred); 625 626 /* 627 * Horrible kludge to establish credentials for NFS XXX. 628 */ 629 630 if (sc->vnode) { 631 struct uio auio; 632 struct iovec aiov; 633 634 tmpbuf = malloc(sc->secsize, M_TEMP, M_WAITOK); 635 bzero(&auio, sizeof(auio)); 636 637 aiov.iov_base = tmpbuf; 638 aiov.iov_len = sc->secsize; 639 auio.uio_iov = &aiov; 640 auio.uio_iovcnt = 1; 641 auio.uio_offset = 0; 642 auio.uio_rw = UIO_READ; 643 auio.uio_segflg = UIO_SYSSPACE; 644 auio.uio_resid = aiov.iov_len; 645 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curproc); 646 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 647 VOP_UNLOCK(sc->vnode, 0, curproc); 648 free(tmpbuf, M_TEMP); 649 } 650 return (error); 651 } 652 653 static int 654 mdcreate_vnode(struct md_ioctl *mdio, struct proc *p) 655 { 656 struct md_s *sc; 657 struct vattr vattr; 658 struct nameidata nd; 659 int error, flags; 660 661 if (mdio->md_options & MD_AUTOUNIT) { 662 sc = mdnew(-1); 663 mdio->md_unit = sc->unit; 664 } else { 665 sc = mdnew(mdio->md_unit); 666 } 667 if (sc == NULL) 668 return (EBUSY); 669 670 sc->type = MD_VNODE; 671 672 flags = FREAD|FWRITE; 673 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, p); 674 error = vn_open(&nd, &flags, 0); 675 if (error) { 676 if (error != EACCES && error != EPERM && error != EROFS) 677 return (error); 678 flags &= ~FWRITE; 679 sc->flags |= MD_READONLY; 680 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, p); 681 error = vn_open(&nd, &flags, 0); 682 if (error) 683 return (error); 684 } 685 NDFREE(&nd, NDF_ONLY_PNBUF); 686 if (nd.ni_vp->v_type != VREG || 687 (error = VOP_GETATTR(nd.ni_vp, &vattr, p->p_ucred, p))) { 688 VOP_UNLOCK(nd.ni_vp, 0, p); 689 (void) vn_close(nd.ni_vp, flags, p->p_ucred, p); 690 return (error ? error : EINVAL); 691 } 692 VOP_UNLOCK(nd.ni_vp, 0, p); 693 sc->secsize = DEV_BSIZE; 694 sc->vnode = nd.ni_vp; 695 696 /* 697 * If the size is specified, override the file attributes. 698 */ 699 if (mdio->md_size) 700 sc->nsect = mdio->md_size; 701 else 702 sc->nsect = vattr.va_size / sc->secsize; /* XXX: round up ? */ 703 error = mdsetcred(sc, p->p_ucred); 704 if (error) { 705 (void) vn_close(nd.ni_vp, flags, p->p_ucred, p); 706 return(error); 707 } 708 mdinit(sc); 709 return (0); 710 } 711 712 static int 713 mddestroy(struct md_s *sc, struct md_ioctl *mdio, struct proc *p) 714 { 715 unsigned u; 716 717 if (sc->dev != NULL) 718 disk_destroy(sc->dev); 719 if (sc->vnode != NULL) 720 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? FREAD : (FREAD|FWRITE), sc->cred, p); 721 if (sc->cred != NULL) 722 crfree(sc->cred); 723 if (sc->object != NULL) 724 vm_pager_deallocate(sc->object); 725 if (sc->secp != NULL) { 726 for (u = 0; u < sc->nsect; u++) 727 if ((uintptr_t)sc->secp[u] > 255) 728 FREE(sc->secp[u], M_MDSECT); 729 FREE(sc->secp, M_MD); 730 } 731 mddelete(sc); 732 return (0); 733 } 734 735 static int 736 mdcreate_swap(struct md_ioctl *mdio, struct proc *p) 737 { 738 int error; 739 struct md_s *sc; 740 741 if (mdio->md_options & MD_AUTOUNIT) { 742 sc = mdnew(-1); 743 mdio->md_unit = sc->unit; 744 } else { 745 sc = mdnew(mdio->md_unit); 746 } 747 if (sc == NULL) 748 return (EBUSY); 749 750 sc->type = MD_SWAP; 751 752 /* 753 * Range check. Disallow negative sizes or any size less then the 754 * size of a page. Then round to a page. 755 */ 756 757 if (mdio->md_size == 0) 758 return(EDOM); 759 760 /* 761 * Allocate an OBJT_SWAP object. 762 * 763 * sc_secsize is PAGE_SIZE'd 764 * 765 * mdio->size is in DEV_BSIZE'd chunks. 766 * Note the truncation. 767 */ 768 769 sc->secsize = PAGE_SIZE; 770 sc->nsect = mdio->md_size / (PAGE_SIZE / DEV_BSIZE); 771 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, sc->secsize * (vm_offset_t)sc->nsect, VM_PROT_DEFAULT, 0); 772 if (mdio->md_options & MD_RESERVE) { 773 if (swap_pager_reserve(sc->object, 0, sc->nsect) < 0) { 774 vm_pager_deallocate(sc->object); 775 sc->object = NULL; 776 return(EDOM); 777 } 778 } 779 error = mdsetcred(sc, p->p_ucred); 780 if (error) 781 mddestroy(sc, mdio, p); 782 else 783 mdinit(sc); 784 return(error); 785 } 786 787 static int 788 mdctlioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct proc *p) 789 { 790 struct md_ioctl *mdio; 791 struct md_s *sc; 792 793 if (md_debug) 794 printf("mdctlioctl(%s %lx %p %x %p)\n", 795 devtoname(dev), cmd, addr, flags, p); 796 797 mdio = (struct md_ioctl *)addr; 798 switch (cmd) { 799 case MDIOCATTACH: 800 switch (mdio->md_type) { 801 case MD_MALLOC: 802 return(mdcreate_malloc(mdio)); 803 case MD_PRELOAD: 804 return(mdcreate_preload(mdio)); 805 case MD_VNODE: 806 return(mdcreate_vnode(mdio, p)); 807 case MD_SWAP: 808 return(mdcreate_swap(mdio, p)); 809 default: 810 return (EINVAL); 811 } 812 case MDIOCDETACH: 813 if (mdio->md_file != NULL) 814 return(EINVAL); 815 if (mdio->md_size != 0) 816 return(EINVAL); 817 if (mdio->md_options != 0) 818 return(EINVAL); 819 sc = mdfind(mdio->md_unit); 820 if (sc == NULL) 821 return (ENOENT); 822 switch(sc->type) { 823 case MD_VNODE: 824 case MD_SWAP: 825 case MD_MALLOC: 826 case MD_PRELOAD: 827 return(mddestroy(sc, mdio, p)); 828 default: 829 return (EOPNOTSUPP); 830 } 831 default: 832 return (ENOIOCTL); 833 }; 834 return (ENOIOCTL); 835 } 836 837 static void 838 md_preloaded(u_char *image, unsigned length) 839 { 840 struct md_s *sc; 841 842 sc = mdnew(-1); 843 if (sc == NULL) 844 return; 845 sc->type = MD_PRELOAD; 846 sc->secsize = DEV_BSIZE; 847 sc->nsect = length / DEV_BSIZE; 848 sc->pl_ptr = image; 849 sc->pl_len = length; 850 if (sc->unit == 0) 851 mdrootready = 1; 852 mdinit(sc); 853 } 854 855 static void 856 md_drvinit(void *unused) 857 { 858 859 caddr_t mod; 860 caddr_t c; 861 u_char *ptr, *name, *type; 862 unsigned len; 863 864 #ifdef MD_ROOT_SIZE 865 md_preloaded(mfs_root, MD_ROOT_SIZE*1024); 866 #endif 867 mod = NULL; 868 while ((mod = preload_search_next_name(mod)) != NULL) { 869 name = (char *)preload_search_info(mod, MODINFO_NAME); 870 type = (char *)preload_search_info(mod, MODINFO_TYPE); 871 if (name == NULL) 872 continue; 873 if (type == NULL) 874 continue; 875 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 876 continue; 877 c = preload_search_info(mod, MODINFO_ADDR); 878 ptr = *(u_char **)c; 879 c = preload_search_info(mod, MODINFO_SIZE); 880 len = *(unsigned *)c; 881 printf("md%d: Preloaded image <%s> %d bytes at %p\n", 882 mdunits, name, len, ptr); 883 md_preloaded(ptr, len); 884 } 885 make_dev(&mdctl_cdevsw, 0xffff00ff, UID_ROOT, GID_WHEEL, 0600, "mdctl"); 886 } 887 888 SYSINIT(mddev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR, md_drvinit,NULL) 889 890 #ifdef MD_ROOT 891 static void 892 md_takeroot(void *junk) 893 { 894 if (mdrootready) 895 rootdevnames[0] = "ufs:/dev/md0c"; 896 } 897 898 SYSINIT(md_root, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, md_takeroot, NULL); 899 #endif 900 901