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_md.h" 61 62 #include <sys/param.h> 63 #include <sys/systm.h> 64 #include <sys/bio.h> 65 #include <sys/conf.h> 66 #include <sys/devicestat.h> 67 #include <sys/disk.h> 68 #include <sys/fcntl.h> 69 #include <sys/kernel.h> 70 #include <sys/kthread.h> 71 #include <sys/linker.h> 72 #include <sys/lock.h> 73 #include <sys/malloc.h> 74 #include <sys/mdioctl.h> 75 #include <sys/mutex.h> 76 #include <sys/namei.h> 77 #include <sys/proc.h> 78 #include <sys/queue.h> 79 #include <sys/sysctl.h> 80 #include <sys/vnode.h> 81 82 #include <vm/vm.h> 83 #include <vm/vm_object.h> 84 #include <vm/vm_page.h> 85 #include <vm/vm_pager.h> 86 #include <vm/swap_pager.h> 87 #include <vm/uma.h> 88 89 #define MD_MODVER 1 90 91 #define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */ 92 93 #ifndef MD_NSECT 94 #define MD_NSECT (10000 * 2) 95 #endif 96 97 static MALLOC_DEFINE(M_MD, "MD disk", "Memory Disk"); 98 static MALLOC_DEFINE(M_MDSECT, "MD sectors", "Memory Disk Sectors"); 99 100 static int md_debug; 101 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, ""); 102 103 #if defined(MD_ROOT) && defined(MD_ROOT_SIZE) 104 /* Image gets put here: */ 105 static u_char mfs_root[MD_ROOT_SIZE*1024] = "MFS Filesystem goes here"; 106 static u_char end_mfs_root[] __unused = "MFS Filesystem had better STOP here"; 107 #endif 108 109 static int mdrootready; 110 static int mdunits; 111 static dev_t status_dev = 0; 112 113 #define CDEV_MAJOR 95 114 115 static d_strategy_t mdstrategy; 116 static d_open_t mdopen; 117 static d_close_t mdclose; 118 static d_ioctl_t mdioctl, mdctlioctl; 119 120 static struct cdevsw md_cdevsw = { 121 /* open */ mdopen, 122 /* close */ mdclose, 123 /* read */ physread, 124 /* write */ physwrite, 125 /* ioctl */ mdioctl, 126 /* poll */ nopoll, 127 /* mmap */ nommap, 128 /* strategy */ mdstrategy, 129 /* name */ MD_NAME, 130 /* maj */ CDEV_MAJOR, 131 /* dump */ nodump, 132 /* psize */ nopsize, 133 /* flags */ D_DISK | D_CANFREE | D_MEMDISK, 134 }; 135 136 static struct cdevsw mdctl_cdevsw = { 137 /* open */ nullopen, 138 /* close */ nullclose, 139 /* read */ noread, 140 /* write */ nowrite, 141 /* ioctl */ mdctlioctl, 142 /* poll */ nopoll, 143 /* mmap */ nommap, 144 /* strategy */ nostrategy, 145 /* name */ MD_NAME, 146 /* maj */ CDEV_MAJOR 147 }; 148 149 static struct cdevsw mddisk_cdevsw; 150 151 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(&md_softc_list); 152 153 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 154 #define NMASK (NINDIR-1) 155 static int nshift; 156 157 struct indir { 158 uintptr_t *array; 159 uint total; 160 uint used; 161 uint shift; 162 }; 163 164 struct md_s { 165 int unit; 166 LIST_ENTRY(md_s) list; 167 struct devstat stats; 168 struct bio_queue_head bio_queue; 169 struct disk disk; 170 dev_t dev; 171 enum md_types type; 172 unsigned nsect; 173 unsigned opencount; 174 unsigned secsize; 175 unsigned flags; 176 char name[20]; 177 struct proc *procp; 178 179 /* MD_MALLOC related fields */ 180 struct indir *indir; 181 uma_zone_t uma; 182 183 /* MD_PRELOAD related fields */ 184 u_char *pl_ptr; 185 unsigned pl_len; 186 187 /* MD_VNODE related fields */ 188 struct vnode *vnode; 189 struct ucred *cred; 190 191 /* MD_SWAP related fields */ 192 vm_object_t object; 193 }; 194 195 static int mddestroy(struct md_s *sc, struct thread *td); 196 197 static struct indir * 198 new_indir(uint shift) 199 { 200 struct indir *ip; 201 202 ip = malloc(sizeof *ip, M_MD, M_NOWAIT | M_ZERO); 203 if (ip == NULL) 204 return (NULL); 205 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 206 M_MDSECT, M_NOWAIT | M_ZERO); 207 if (ip->array == NULL) { 208 free(ip, M_MD); 209 return (NULL); 210 } 211 ip->total = NINDIR; 212 ip->shift = shift; 213 return (ip); 214 } 215 216 static void 217 del_indir(struct indir *ip) 218 { 219 220 free(ip->array, M_MDSECT); 221 free(ip, M_MD); 222 } 223 224 static void 225 destroy_indir(struct md_s *sc, struct indir *ip) 226 { 227 int i; 228 229 for (i = 0; i < NINDIR; i++) { 230 if (!ip->array[i]) 231 continue; 232 if (ip->shift) 233 destroy_indir(sc, (struct indir*)(ip->array[i])); 234 else if (ip->array[i] > 255) 235 uma_zfree(sc->uma, (void *)(ip->array[i])); 236 } 237 del_indir(ip); 238 } 239 240 /* 241 * This function does the math and alloctes the top level "indir" structure 242 * for a device of "size" sectors. 243 */ 244 245 static struct indir * 246 dimension(off_t size) 247 { 248 off_t rcnt; 249 struct indir *ip; 250 int i, layer; 251 252 rcnt = size; 253 layer = 0; 254 while (rcnt > NINDIR) { 255 rcnt /= NINDIR; 256 layer++; 257 } 258 /* figure out log2(NINDIR) */ 259 for (i = NINDIR, nshift = -1; i; nshift++) 260 i >>= 1; 261 262 /* 263 * XXX: the top layer is probably not fully populated, so we allocate 264 * too much space for ip->array in new_indir() here. 265 */ 266 ip = new_indir(layer * nshift); 267 return (ip); 268 } 269 270 /* 271 * Read a given sector 272 */ 273 274 static uintptr_t 275 s_read(struct indir *ip, off_t offset) 276 { 277 struct indir *cip; 278 int idx; 279 uintptr_t up; 280 281 if (md_debug > 1) 282 printf("s_read(%lld)\n", offset); 283 up = 0; 284 for (cip = ip; cip != NULL;) { 285 if (cip->shift) { 286 idx = (offset >> cip->shift) & NMASK; 287 up = cip->array[idx]; 288 cip = (struct indir *)up; 289 continue; 290 } 291 idx = offset & NMASK; 292 return (cip->array[idx]); 293 } 294 return (0); 295 } 296 297 /* 298 * Write a given sector, prune the tree if the value is 0 299 */ 300 301 static int 302 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 303 { 304 struct indir *cip, *lip[10]; 305 int idx, li; 306 uintptr_t up; 307 308 if (md_debug > 1) 309 printf("s_write(%lld, %p)\n", offset, (void *)ptr); 310 up = 0; 311 li = 0; 312 cip = ip; 313 for (;;) { 314 lip[li++] = cip; 315 if (cip->shift) { 316 idx = (offset >> cip->shift) & NMASK; 317 up = cip->array[idx]; 318 if (up != 0) { 319 cip = (struct indir *)up; 320 continue; 321 } 322 /* Allocate branch */ 323 cip->array[idx] = 324 (uintptr_t)new_indir(cip->shift - nshift); 325 if (cip->array[idx] == 0) 326 return (ENOMEM); 327 cip->used++; 328 up = cip->array[idx]; 329 cip = (struct indir *)up; 330 continue; 331 } 332 /* leafnode */ 333 idx = offset & NMASK; 334 up = cip->array[idx]; 335 if (up != 0) 336 cip->used--; 337 cip->array[idx] = ptr; 338 if (ptr != 0) 339 cip->used++; 340 break; 341 } 342 if (cip->used != 0 || li == 1) 343 return (0); 344 li--; 345 while (cip->used == 0 && cip != ip) { 346 li--; 347 idx = (offset >> lip[li]->shift) & NMASK; 348 up = lip[li]->array[idx]; 349 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 350 del_indir(cip); 351 lip[li]->array[idx] = NULL; 352 lip[li]->used--; 353 cip = lip[li]; 354 } 355 return (0); 356 } 357 358 static int 359 mdopen(dev_t dev, int flag, int fmt, struct thread *td) 360 { 361 struct md_s *sc; 362 struct disklabel *dl; 363 364 if (md_debug) 365 printf("mdopen(%s %x %x %p)\n", 366 devtoname(dev), flag, fmt, td); 367 368 sc = dev->si_drv1; 369 370 dl = &sc->disk.d_label; 371 bzero(dl, sizeof(*dl)); 372 dl->d_secsize = sc->secsize; 373 dl->d_nsectors = sc->nsect > 63 ? 63 : sc->nsect; 374 dl->d_ntracks = 1; 375 dl->d_secpercyl = dl->d_nsectors * dl->d_ntracks; 376 dl->d_secperunit = sc->nsect; 377 dl->d_ncylinders = dl->d_secperunit / dl->d_secpercyl; 378 sc->opencount++; 379 return (0); 380 } 381 382 static int 383 mdclose(dev_t dev, int flags, int fmt, struct thread *td) 384 { 385 struct md_s *sc = dev->si_drv1; 386 387 sc->opencount--; 388 return (0); 389 } 390 391 static int 392 mdioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 393 { 394 395 if (md_debug) 396 printf("mdioctl(%s %lx %p %x %p)\n", 397 devtoname(dev), cmd, addr, flags, td); 398 399 return (ENOIOCTL); 400 } 401 402 static int 403 mdstart_malloc(struct md_s *sc, struct bio *bp) 404 { 405 int i, error; 406 u_char *dst; 407 unsigned secno, nsec, uc; 408 uintptr_t sp, osp; 409 410 nsec = bp->bio_bcount / sc->secsize; 411 secno = bp->bio_pblkno; 412 dst = bp->bio_data; 413 error = 0; 414 while (nsec--) { 415 osp = s_read(sc->indir, secno); 416 if (bp->bio_cmd == BIO_DELETE) { 417 if (osp != 0) 418 error = s_write(sc->indir, secno, 0); 419 } else if (bp->bio_cmd == BIO_READ) { 420 if (osp == 0) 421 bzero(dst, sc->secsize); 422 else if (osp <= 255) 423 for (i = 0; i < sc->secsize; i++) 424 dst[i] = osp; 425 else 426 bcopy((void *)osp, dst, sc->secsize); 427 osp = 0; 428 } else if (bp->bio_cmd == BIO_WRITE) { 429 if (sc->flags & MD_COMPRESS) { 430 uc = dst[0]; 431 for (i = 1; i < sc->secsize; i++) 432 if (dst[i] != uc) 433 break; 434 } else { 435 i = 0; 436 uc = 0; 437 } 438 if (i == sc->secsize) { 439 if (osp != uc) 440 error = s_write(sc->indir, secno, uc); 441 } else { 442 if (osp <= 255) { 443 sp = (uintptr_t) uma_zalloc( 444 sc->uma, M_NOWAIT); 445 if (sp == 0) { 446 error = ENOSPC; 447 break; 448 } 449 bcopy(dst, (void *)sp, sc->secsize); 450 error = s_write(sc->indir, secno, sp); 451 } else { 452 bcopy(dst, (void *)osp, sc->secsize); 453 osp = 0; 454 } 455 } 456 } else { 457 error = EOPNOTSUPP; 458 } 459 if (osp > 255) 460 uma_zfree(sc->uma, (void*)osp); 461 if (error) 462 break; 463 secno++; 464 dst += sc->secsize; 465 } 466 bp->bio_resid = 0; 467 return (error); 468 } 469 470 static int 471 mdstart_preload(struct md_s *sc, struct bio *bp) 472 { 473 474 if (bp->bio_cmd == BIO_DELETE) { 475 } else if (bp->bio_cmd == BIO_READ) { 476 bcopy(sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_data, bp->bio_bcount); 477 } else { 478 bcopy(bp->bio_data, sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_bcount); 479 } 480 bp->bio_resid = 0; 481 return (0); 482 } 483 484 static int 485 mdstart_vnode(struct md_s *sc, struct bio *bp) 486 { 487 int error; 488 struct uio auio; 489 struct iovec aiov; 490 struct mount *mp; 491 492 /* 493 * VNODE I/O 494 * 495 * If an error occurs, we set BIO_ERROR but we do not set 496 * B_INVAL because (for a write anyway), the buffer is 497 * still valid. 498 */ 499 500 bzero(&auio, sizeof(auio)); 501 502 aiov.iov_base = bp->bio_data; 503 aiov.iov_len = bp->bio_bcount; 504 auio.uio_iov = &aiov; 505 auio.uio_iovcnt = 1; 506 auio.uio_offset = (vm_ooffset_t)bp->bio_pblkno * sc->secsize; 507 auio.uio_segflg = UIO_SYSSPACE; 508 if(bp->bio_cmd == BIO_READ) 509 auio.uio_rw = UIO_READ; 510 else 511 auio.uio_rw = UIO_WRITE; 512 auio.uio_resid = bp->bio_bcount; 513 auio.uio_td = curthread; 514 /* 515 * When reading set IO_DIRECT to try to avoid double-caching 516 * the data. When writing IO_DIRECT is not optimal, but we 517 * must set IO_NOWDRAIN to avoid a wdrain deadlock. 518 */ 519 if (bp->bio_cmd == BIO_READ) { 520 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 521 error = VOP_READ(sc->vnode, &auio, IO_DIRECT, sc->cred); 522 } else { 523 (void) vn_start_write(sc->vnode, &mp, V_WAIT); 524 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 525 error = VOP_WRITE(sc->vnode, &auio, IO_NOWDRAIN, sc->cred); 526 vn_finished_write(mp); 527 } 528 VOP_UNLOCK(sc->vnode, 0, curthread); 529 bp->bio_resid = auio.uio_resid; 530 return (error); 531 } 532 533 static int 534 mdstart_swap(struct md_s *sc, struct bio *bp) 535 { 536 537 if ((bp->bio_cmd == BIO_DELETE) && (sc->flags & MD_RESERVE)) 538 biodone(bp); 539 else 540 vm_pager_strategy(sc->object, bp); 541 return (-1); 542 } 543 544 static void 545 mdstrategy(struct bio *bp) 546 { 547 struct md_s *sc; 548 549 if (md_debug > 1) 550 printf("mdstrategy(%p) %s %x, %lld, %ld, %p)\n", 551 (void *)bp, devtoname(bp->bio_dev), bp->bio_flags, 552 (long long)bp->bio_blkno, bp->bio_bcount / DEV_BSIZE, 553 (void *)bp->bio_data); 554 555 sc = bp->bio_dev->si_drv1; 556 557 /* XXX: LOCK(sc->lock) */ 558 bioqdisksort(&sc->bio_queue, bp); 559 /* XXX: UNLOCK(sc->lock) */ 560 561 wakeup(sc); 562 } 563 564 static void 565 md_kthread(void *arg) 566 { 567 struct md_s *sc; 568 struct bio *bp; 569 int error; 570 571 sc = arg; 572 curthread->td_base_pri = PRIBIO; 573 574 mtx_lock(&Giant); 575 for (;;) { 576 /* XXX: LOCK(unique unit numbers) */ 577 bp = bioq_first(&sc->bio_queue); 578 if (bp) 579 bioq_remove(&sc->bio_queue, bp); 580 /* XXX: UNLOCK(unique unit numbers) */ 581 if (!bp) { 582 tsleep(sc, PRIBIO, "mdwait", 0); 583 if (sc->flags & MD_SHUTDOWN) { 584 sc->procp = NULL; 585 wakeup(&sc->procp); 586 kthread_exit(0); 587 } 588 continue; 589 } 590 591 switch (sc->type) { 592 case MD_MALLOC: 593 devstat_start_transaction(&sc->stats); 594 error = mdstart_malloc(sc, bp); 595 break; 596 case MD_PRELOAD: 597 devstat_start_transaction(&sc->stats); 598 error = mdstart_preload(sc, bp); 599 break; 600 case MD_VNODE: 601 devstat_start_transaction(&sc->stats); 602 error = mdstart_vnode(sc, bp); 603 break; 604 case MD_SWAP: 605 error = mdstart_swap(sc, bp); 606 break; 607 default: 608 panic("Impossible md(type)"); 609 break; 610 } 611 612 if (error != -1) 613 biofinish(bp, &sc->stats, error); 614 } 615 } 616 617 static struct md_s * 618 mdfind(int unit) 619 { 620 struct md_s *sc; 621 622 /* XXX: LOCK(unique unit numbers) */ 623 LIST_FOREACH(sc, &md_softc_list, list) { 624 if (sc->unit == unit) 625 break; 626 } 627 /* XXX: UNLOCK(unique unit numbers) */ 628 return (sc); 629 } 630 631 static struct md_s * 632 mdnew(int unit) 633 { 634 struct md_s *sc; 635 int error, max = -1; 636 637 /* XXX: LOCK(unique unit numbers) */ 638 LIST_FOREACH(sc, &md_softc_list, list) { 639 if (sc->unit == unit) { 640 /* XXX: UNLOCK(unique unit numbers) */ 641 return (NULL); 642 } 643 if (sc->unit > max) 644 max = sc->unit; 645 } 646 if (unit == -1) 647 unit = max + 1; 648 if (unit > DKMAXUNIT) 649 return (NULL); 650 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 651 sc->unit = unit; 652 sprintf(sc->name, "md%d", unit); 653 error = kthread_create(md_kthread, sc, &sc->procp, 0, "%s", sc->name); 654 if (error) { 655 free(sc, M_MD); 656 return (NULL); 657 } 658 LIST_INSERT_HEAD(&md_softc_list, sc, list); 659 /* XXX: UNLOCK(unique unit numbers) */ 660 return (sc); 661 } 662 663 static void 664 mdinit(struct md_s *sc) 665 { 666 667 bioq_init(&sc->bio_queue); 668 devstat_add_entry(&sc->stats, MD_NAME, sc->unit, sc->secsize, 669 DEVSTAT_NO_ORDERED_TAGS, 670 DEVSTAT_TYPE_DIRECT | DEVSTAT_TYPE_IF_OTHER, 671 DEVSTAT_PRIORITY_OTHER); 672 sc->dev = disk_create(sc->unit, &sc->disk, 0, &md_cdevsw, &mddisk_cdevsw); 673 sc->dev->si_drv1 = sc; 674 } 675 676 /* 677 * XXX: we should check that the range they feed us is mapped. 678 * XXX: we should implement read-only. 679 */ 680 681 static int 682 mdcreate_preload(struct md_ioctl *mdio) 683 { 684 struct md_s *sc; 685 686 if (mdio->md_size == 0) 687 return (EINVAL); 688 if (mdio->md_options & ~(MD_AUTOUNIT)) 689 return (EINVAL); 690 if (mdio->md_options & MD_AUTOUNIT) { 691 sc = mdnew(-1); 692 if (sc == NULL) 693 return (ENOMEM); 694 mdio->md_unit = sc->unit; 695 } else { 696 sc = mdnew(mdio->md_unit); 697 if (sc == NULL) 698 return (EBUSY); 699 } 700 sc->type = MD_PRELOAD; 701 sc->secsize = DEV_BSIZE; 702 sc->nsect = mdio->md_size; 703 sc->flags = mdio->md_options & MD_FORCE; 704 /* Cast to pointer size, then to pointer to avoid warning */ 705 sc->pl_ptr = (u_char *)(uintptr_t)mdio->md_base; 706 sc->pl_len = (mdio->md_size << DEV_BSHIFT); 707 mdinit(sc); 708 return (0); 709 } 710 711 712 static int 713 mdcreate_malloc(struct md_ioctl *mdio) 714 { 715 struct md_s *sc; 716 off_t u; 717 uintptr_t sp; 718 int error; 719 720 error = 0; 721 if (mdio->md_size == 0) 722 return (EINVAL); 723 if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 724 return (EINVAL); 725 /* Compression doesn't make sense if we have reserved space */ 726 if (mdio->md_options & MD_RESERVE) 727 mdio->md_options &= ~MD_COMPRESS; 728 if (mdio->md_options & MD_AUTOUNIT) { 729 sc = mdnew(-1); 730 if (sc == NULL) 731 return (ENOMEM); 732 mdio->md_unit = sc->unit; 733 } else { 734 sc = mdnew(mdio->md_unit); 735 if (sc == NULL) 736 return (EBUSY); 737 } 738 sc->type = MD_MALLOC; 739 sc->secsize = DEV_BSIZE; 740 sc->nsect = mdio->md_size; 741 sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE); 742 sc->indir = dimension(sc->nsect); 743 sc->uma = uma_zcreate(sc->name, sc->secsize, 744 NULL, NULL, NULL, NULL, 0x1ff, 0); 745 if (mdio->md_options & MD_RESERVE) { 746 for (u = 0; u < sc->nsect; u++) { 747 sp = (uintptr_t) uma_zalloc(sc->uma, M_NOWAIT | M_ZERO); 748 if (sp != 0) 749 error = s_write(sc->indir, u, sp); 750 else 751 error = ENOMEM; 752 if (error) 753 break; 754 } 755 } 756 if (!error) { 757 printf("%s%d: Malloc disk\n", MD_NAME, sc->unit); 758 mdinit(sc); 759 } else 760 mddestroy(sc, NULL); 761 return (error); 762 } 763 764 765 static int 766 mdsetcred(struct md_s *sc, struct ucred *cred) 767 { 768 char *tmpbuf; 769 int error = 0; 770 771 /* 772 * Set credits in our softc 773 */ 774 775 if (sc->cred) 776 crfree(sc->cred); 777 sc->cred = crhold(cred); 778 779 /* 780 * Horrible kludge to establish credentials for NFS XXX. 781 */ 782 783 if (sc->vnode) { 784 struct uio auio; 785 struct iovec aiov; 786 787 tmpbuf = malloc(sc->secsize, M_TEMP, M_WAITOK); 788 bzero(&auio, sizeof(auio)); 789 790 aiov.iov_base = tmpbuf; 791 aiov.iov_len = sc->secsize; 792 auio.uio_iov = &aiov; 793 auio.uio_iovcnt = 1; 794 auio.uio_offset = 0; 795 auio.uio_rw = UIO_READ; 796 auio.uio_segflg = UIO_SYSSPACE; 797 auio.uio_resid = aiov.iov_len; 798 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 799 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 800 VOP_UNLOCK(sc->vnode, 0, curthread); 801 free(tmpbuf, M_TEMP); 802 } 803 return (error); 804 } 805 806 static int 807 mdcreate_vnode(struct md_ioctl *mdio, struct thread *td) 808 { 809 struct md_s *sc; 810 struct vattr vattr; 811 struct nameidata nd; 812 int error, flags; 813 814 flags = FREAD|FWRITE; 815 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 816 error = vn_open(&nd, &flags, 0); 817 if (error) { 818 if (error != EACCES && error != EPERM && error != EROFS) 819 return (error); 820 flags &= ~FWRITE; 821 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 822 error = vn_open(&nd, &flags, 0); 823 if (error) 824 return (error); 825 } 826 NDFREE(&nd, NDF_ONLY_PNBUF); 827 if (nd.ni_vp->v_type != VREG || 828 (error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred, td))) { 829 VOP_UNLOCK(nd.ni_vp, 0, td); 830 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 831 return (error ? error : EINVAL); 832 } 833 VOP_UNLOCK(nd.ni_vp, 0, td); 834 835 if (mdio->md_options & MD_AUTOUNIT) { 836 sc = mdnew(-1); 837 mdio->md_unit = sc->unit; 838 } else { 839 sc = mdnew(mdio->md_unit); 840 } 841 if (sc == NULL) { 842 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 843 return (EBUSY); 844 } 845 846 sc->type = MD_VNODE; 847 sc->flags = mdio->md_options & MD_FORCE; 848 if (!(flags & FWRITE)) 849 sc->flags |= MD_READONLY; 850 sc->secsize = DEV_BSIZE; 851 sc->vnode = nd.ni_vp; 852 853 /* 854 * If the size is specified, override the file attributes. 855 */ 856 if (mdio->md_size) 857 sc->nsect = mdio->md_size; 858 else 859 sc->nsect = vattr.va_size / sc->secsize; /* XXX: round up ? */ 860 if (sc->nsect == 0) { 861 mddestroy(sc, td); 862 return (EINVAL); 863 } 864 error = mdsetcred(sc, td->td_ucred); 865 if (error) { 866 mddestroy(sc, td); 867 return (error); 868 } 869 mdinit(sc); 870 return (0); 871 } 872 873 static int 874 mddestroy(struct md_s *sc, struct thread *td) 875 { 876 877 GIANT_REQUIRED; 878 879 if (sc->dev != NULL) { 880 devstat_remove_entry(&sc->stats); 881 disk_destroy(sc->dev); 882 } 883 sc->flags |= MD_SHUTDOWN; 884 wakeup(sc); 885 while (sc->procp != NULL) 886 tsleep(&sc->procp, PRIBIO, "mddestroy", hz / 10); 887 if (sc->vnode != NULL) 888 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 889 FREAD : (FREAD|FWRITE), sc->cred, td); 890 if (sc->cred != NULL) 891 crfree(sc->cred); 892 if (sc->object != NULL) { 893 vm_pager_deallocate(sc->object); 894 } 895 if (sc->indir) 896 destroy_indir(sc, sc->indir); 897 if (sc->uma) 898 uma_zdestroy(sc->uma); 899 900 /* XXX: LOCK(unique unit numbers) */ 901 LIST_REMOVE(sc, list); 902 /* XXX: UNLOCK(unique unit numbers) */ 903 free(sc, M_MD); 904 return (0); 905 } 906 907 static int 908 mdcreate_swap(struct md_ioctl *mdio, struct thread *td) 909 { 910 int error; 911 struct md_s *sc; 912 913 GIANT_REQUIRED; 914 915 if (mdio->md_options & MD_AUTOUNIT) { 916 sc = mdnew(-1); 917 mdio->md_unit = sc->unit; 918 } else { 919 sc = mdnew(mdio->md_unit); 920 } 921 if (sc == NULL) 922 return (EBUSY); 923 924 sc->type = MD_SWAP; 925 926 /* 927 * Range check. Disallow negative sizes or any size less then the 928 * size of a page. Then round to a page. 929 */ 930 931 if (mdio->md_size == 0) { 932 mddestroy(sc, td); 933 return (EDOM); 934 } 935 936 /* 937 * Allocate an OBJT_SWAP object. 938 * 939 * sc_secsize is PAGE_SIZE'd 940 * 941 * mdio->size is in DEV_BSIZE'd chunks. 942 * Note the truncation. 943 */ 944 945 sc->secsize = PAGE_SIZE; 946 sc->nsect = mdio->md_size / (PAGE_SIZE / DEV_BSIZE); 947 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, sc->secsize * (vm_offset_t)sc->nsect, VM_PROT_DEFAULT, 0); 948 sc->flags = mdio->md_options & MD_FORCE; 949 if (mdio->md_options & MD_RESERVE) { 950 if (swap_pager_reserve(sc->object, 0, sc->nsect) < 0) { 951 vm_pager_deallocate(sc->object); 952 sc->object = NULL; 953 mddestroy(sc, td); 954 return (EDOM); 955 } 956 } 957 error = mdsetcred(sc, td->td_ucred); 958 if (error) 959 mddestroy(sc, td); 960 else 961 mdinit(sc); 962 return (error); 963 } 964 965 static int 966 mddetach(int unit, struct thread *td) 967 { 968 struct md_s *sc; 969 970 sc = mdfind(unit); 971 if (sc == NULL) 972 return (ENOENT); 973 if (sc->opencount != 0 && !(sc->flags & MD_FORCE)) 974 return (EBUSY); 975 switch(sc->type) { 976 case MD_VNODE: 977 case MD_SWAP: 978 case MD_MALLOC: 979 case MD_PRELOAD: 980 return (mddestroy(sc, td)); 981 default: 982 return (EOPNOTSUPP); 983 } 984 } 985 986 static int 987 mdctlioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 988 { 989 struct md_ioctl *mdio; 990 struct md_s *sc; 991 992 if (md_debug) 993 printf("mdctlioctl(%s %lx %p %x %p)\n", 994 devtoname(dev), cmd, addr, flags, td); 995 996 /* 997 * We assert the version number in the individual ioctl 998 * handlers instead of out here because (a) it is possible we 999 * may add another ioctl in the future which doesn't read an 1000 * mdio, and (b) the correct return value for an unknown ioctl 1001 * is ENOIOCTL, not EINVAL. 1002 */ 1003 mdio = (struct md_ioctl *)addr; 1004 switch (cmd) { 1005 case MDIOCATTACH: 1006 if (mdio->md_version != MDIOVERSION) 1007 return (EINVAL); 1008 switch (mdio->md_type) { 1009 case MD_MALLOC: 1010 return (mdcreate_malloc(mdio)); 1011 case MD_PRELOAD: 1012 return (mdcreate_preload(mdio)); 1013 case MD_VNODE: 1014 return (mdcreate_vnode(mdio, td)); 1015 case MD_SWAP: 1016 return (mdcreate_swap(mdio, td)); 1017 default: 1018 return (EINVAL); 1019 } 1020 case MDIOCDETACH: 1021 if (mdio->md_version != MDIOVERSION) 1022 return (EINVAL); 1023 if (mdio->md_file != NULL || mdio->md_size != 0 || 1024 mdio->md_options != 0) 1025 return (EINVAL); 1026 return (mddetach(mdio->md_unit, td)); 1027 case MDIOCQUERY: 1028 if (mdio->md_version != MDIOVERSION) 1029 return (EINVAL); 1030 sc = mdfind(mdio->md_unit); 1031 if (sc == NULL) 1032 return (ENOENT); 1033 mdio->md_type = sc->type; 1034 mdio->md_options = sc->flags; 1035 switch (sc->type) { 1036 case MD_MALLOC: 1037 mdio->md_size = sc->nsect; 1038 break; 1039 case MD_PRELOAD: 1040 mdio->md_size = sc->nsect; 1041 (u_char *)(uintptr_t)mdio->md_base = sc->pl_ptr; 1042 break; 1043 case MD_SWAP: 1044 mdio->md_size = sc->nsect * (PAGE_SIZE / DEV_BSIZE); 1045 break; 1046 case MD_VNODE: 1047 mdio->md_size = sc->nsect; 1048 /* XXX fill this in */ 1049 mdio->md_file = NULL; 1050 break; 1051 } 1052 return (0); 1053 default: 1054 return (ENOIOCTL); 1055 }; 1056 return (ENOIOCTL); 1057 } 1058 1059 static void 1060 md_preloaded(u_char *image, unsigned length) 1061 { 1062 struct md_s *sc; 1063 1064 sc = mdnew(-1); 1065 if (sc == NULL) 1066 return; 1067 sc->type = MD_PRELOAD; 1068 sc->secsize = DEV_BSIZE; 1069 sc->nsect = length / DEV_BSIZE; 1070 sc->pl_ptr = image; 1071 sc->pl_len = length; 1072 if (sc->unit == 0) 1073 mdrootready = 1; 1074 mdinit(sc); 1075 } 1076 1077 static void 1078 md_drvinit(void *unused) 1079 { 1080 1081 caddr_t mod; 1082 caddr_t c; 1083 u_char *ptr, *name, *type; 1084 unsigned len; 1085 1086 #ifdef MD_ROOT_SIZE 1087 md_preloaded(mfs_root, MD_ROOT_SIZE*1024); 1088 #endif 1089 mod = NULL; 1090 while ((mod = preload_search_next_name(mod)) != NULL) { 1091 name = (char *)preload_search_info(mod, MODINFO_NAME); 1092 type = (char *)preload_search_info(mod, MODINFO_TYPE); 1093 if (name == NULL) 1094 continue; 1095 if (type == NULL) 1096 continue; 1097 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 1098 continue; 1099 c = preload_search_info(mod, MODINFO_ADDR); 1100 ptr = *(u_char **)c; 1101 c = preload_search_info(mod, MODINFO_SIZE); 1102 len = *(unsigned *)c; 1103 printf("%s%d: Preloaded image <%s> %d bytes at %p\n", 1104 MD_NAME, mdunits, name, len, ptr); 1105 md_preloaded(ptr, len); 1106 } 1107 status_dev = make_dev(&mdctl_cdevsw, 0xffff00ff, UID_ROOT, GID_WHEEL, 1108 0600, MDCTL_NAME); 1109 } 1110 1111 static int 1112 md_modevent(module_t mod, int type, void *data) 1113 { 1114 int error; 1115 struct md_s *sc; 1116 1117 switch (type) { 1118 case MOD_LOAD: 1119 md_drvinit(NULL); 1120 break; 1121 case MOD_UNLOAD: 1122 LIST_FOREACH(sc, &md_softc_list, list) { 1123 error = mddetach(sc->unit, curthread); 1124 if (error != 0) 1125 return (error); 1126 } 1127 if (status_dev) 1128 destroy_dev(status_dev); 1129 status_dev = 0; 1130 break; 1131 default: 1132 break; 1133 } 1134 return (0); 1135 } 1136 1137 static moduledata_t md_mod = { 1138 MD_NAME, 1139 md_modevent, 1140 NULL 1141 }; 1142 DECLARE_MODULE(md, md_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE+CDEV_MAJOR); 1143 MODULE_VERSION(md, MD_MODVER); 1144 1145 1146 #ifdef MD_ROOT 1147 static void 1148 md_takeroot(void *junk) 1149 { 1150 if (mdrootready) 1151 rootdevnames[0] = "ufs:/dev/md0c"; 1152 } 1153 1154 SYSINIT(md_root, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, md_takeroot, NULL); 1155 #endif 1156