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/stdint.h> 80 #include <sys/sysctl.h> 81 #include <sys/vnode.h> 82 83 #include <vm/vm.h> 84 #include <vm/vm_object.h> 85 #include <vm/vm_page.h> 86 #include <vm/vm_pager.h> 87 #include <vm/swap_pager.h> 88 #include <vm/uma.h> 89 90 #define MD_MODVER 1 91 92 #define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */ 93 94 #ifndef MD_NSECT 95 #define MD_NSECT (10000 * 2) 96 #endif 97 98 static MALLOC_DEFINE(M_MD, "MD disk", "Memory Disk"); 99 static MALLOC_DEFINE(M_MDSECT, "MD sectors", "Memory Disk Sectors"); 100 101 static int md_debug; 102 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, ""); 103 104 #if defined(MD_ROOT) && defined(MD_ROOT_SIZE) 105 /* Image gets put here: */ 106 static u_char mfs_root[MD_ROOT_SIZE*1024] = "MFS Filesystem goes here"; 107 static u_char end_mfs_root[] __unused = "MFS Filesystem had better STOP here"; 108 #endif 109 110 static int mdrootready; 111 static int mdunits; 112 static dev_t status_dev = 0; 113 114 #define CDEV_MAJOR 95 115 116 static d_strategy_t mdstrategy; 117 static d_open_t mdopen; 118 static d_close_t mdclose; 119 static d_ioctl_t mdioctl, mdctlioctl; 120 121 static struct cdevsw md_cdevsw = { 122 /* open */ mdopen, 123 /* close */ mdclose, 124 /* read */ physread, 125 /* write */ physwrite, 126 /* ioctl */ mdioctl, 127 /* poll */ nopoll, 128 /* mmap */ nommap, 129 /* strategy */ mdstrategy, 130 /* name */ MD_NAME, 131 /* maj */ CDEV_MAJOR, 132 /* dump */ nodump, 133 /* psize */ nopsize, 134 /* flags */ D_DISK | D_CANFREE | D_MEMDISK, 135 }; 136 137 static struct cdevsw mdctl_cdevsw = { 138 /* open */ nullopen, 139 /* close */ nullclose, 140 /* read */ noread, 141 /* write */ nowrite, 142 /* ioctl */ mdctlioctl, 143 /* poll */ nopoll, 144 /* mmap */ nommap, 145 /* strategy */ nostrategy, 146 /* name */ MD_NAME, 147 /* maj */ CDEV_MAJOR 148 }; 149 150 static struct cdevsw mddisk_cdevsw; 151 152 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(&md_softc_list); 153 154 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 155 #define NMASK (NINDIR-1) 156 static int nshift; 157 158 struct indir { 159 uintptr_t *array; 160 uint total; 161 uint used; 162 uint shift; 163 }; 164 165 struct md_s { 166 int unit; 167 LIST_ENTRY(md_s) list; 168 struct devstat stats; 169 struct bio_queue_head bio_queue; 170 struct disk disk; 171 dev_t dev; 172 enum md_types type; 173 unsigned nsect; 174 unsigned opencount; 175 unsigned secsize; 176 unsigned flags; 177 char name[20]; 178 struct proc *procp; 179 180 /* MD_MALLOC related fields */ 181 struct indir *indir; 182 uma_zone_t uma; 183 184 /* MD_PRELOAD related fields */ 185 u_char *pl_ptr; 186 unsigned pl_len; 187 188 /* MD_VNODE related fields */ 189 struct vnode *vnode; 190 struct ucred *cred; 191 192 /* MD_SWAP related fields */ 193 vm_object_t object; 194 }; 195 196 static int mddestroy(struct md_s *sc, struct thread *td); 197 198 static struct indir * 199 new_indir(uint shift) 200 { 201 struct indir *ip; 202 203 ip = malloc(sizeof *ip, M_MD, M_NOWAIT | M_ZERO); 204 if (ip == NULL) 205 return (NULL); 206 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 207 M_MDSECT, M_NOWAIT | M_ZERO); 208 if (ip->array == NULL) { 209 free(ip, M_MD); 210 return (NULL); 211 } 212 ip->total = NINDIR; 213 ip->shift = shift; 214 return (ip); 215 } 216 217 static void 218 del_indir(struct indir *ip) 219 { 220 221 free(ip->array, M_MDSECT); 222 free(ip, M_MD); 223 } 224 225 static void 226 destroy_indir(struct md_s *sc, struct indir *ip) 227 { 228 int i; 229 230 for (i = 0; i < NINDIR; i++) { 231 if (!ip->array[i]) 232 continue; 233 if (ip->shift) 234 destroy_indir(sc, (struct indir*)(ip->array[i])); 235 else if (ip->array[i] > 255) 236 uma_zfree(sc->uma, (void *)(ip->array[i])); 237 } 238 del_indir(ip); 239 } 240 241 /* 242 * This function does the math and alloctes the top level "indir" structure 243 * for a device of "size" sectors. 244 */ 245 246 static struct indir * 247 dimension(off_t size) 248 { 249 off_t rcnt; 250 struct indir *ip; 251 int i, layer; 252 253 rcnt = size; 254 layer = 0; 255 while (rcnt > NINDIR) { 256 rcnt /= NINDIR; 257 layer++; 258 } 259 /* figure out log2(NINDIR) */ 260 for (i = NINDIR, nshift = -1; i; nshift++) 261 i >>= 1; 262 263 /* 264 * XXX: the top layer is probably not fully populated, so we allocate 265 * too much space for ip->array in new_indir() here. 266 */ 267 ip = new_indir(layer * nshift); 268 return (ip); 269 } 270 271 /* 272 * Read a given sector 273 */ 274 275 static uintptr_t 276 s_read(struct indir *ip, off_t offset) 277 { 278 struct indir *cip; 279 int idx; 280 uintptr_t up; 281 282 if (md_debug > 1) 283 printf("s_read(%jd)\n", (intmax_t)offset); 284 up = 0; 285 for (cip = ip; cip != NULL;) { 286 if (cip->shift) { 287 idx = (offset >> cip->shift) & NMASK; 288 up = cip->array[idx]; 289 cip = (struct indir *)up; 290 continue; 291 } 292 idx = offset & NMASK; 293 return (cip->array[idx]); 294 } 295 return (0); 296 } 297 298 /* 299 * Write a given sector, prune the tree if the value is 0 300 */ 301 302 static int 303 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 304 { 305 struct indir *cip, *lip[10]; 306 int idx, li; 307 uintptr_t up; 308 309 if (md_debug > 1) 310 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 311 up = 0; 312 li = 0; 313 cip = ip; 314 for (;;) { 315 lip[li++] = cip; 316 if (cip->shift) { 317 idx = (offset >> cip->shift) & NMASK; 318 up = cip->array[idx]; 319 if (up != 0) { 320 cip = (struct indir *)up; 321 continue; 322 } 323 /* Allocate branch */ 324 cip->array[idx] = 325 (uintptr_t)new_indir(cip->shift - nshift); 326 if (cip->array[idx] == 0) 327 return (ENOMEM); 328 cip->used++; 329 up = cip->array[idx]; 330 cip = (struct indir *)up; 331 continue; 332 } 333 /* leafnode */ 334 idx = offset & NMASK; 335 up = cip->array[idx]; 336 if (up != 0) 337 cip->used--; 338 cip->array[idx] = ptr; 339 if (ptr != 0) 340 cip->used++; 341 break; 342 } 343 if (cip->used != 0 || li == 1) 344 return (0); 345 li--; 346 while (cip->used == 0 && cip != ip) { 347 li--; 348 idx = (offset >> lip[li]->shift) & NMASK; 349 up = lip[li]->array[idx]; 350 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 351 del_indir(cip); 352 lip[li]->array[idx] = NULL; 353 lip[li]->used--; 354 cip = lip[li]; 355 } 356 return (0); 357 } 358 359 static int 360 mdopen(dev_t dev, int flag, int fmt, struct thread *td) 361 { 362 struct md_s *sc; 363 struct disklabel *dl; 364 365 if (md_debug) 366 printf("mdopen(%s %x %x %p)\n", 367 devtoname(dev), flag, fmt, td); 368 369 sc = dev->si_drv1; 370 371 dl = &sc->disk.d_label; 372 bzero(dl, sizeof(*dl)); 373 dl->d_secsize = sc->secsize; 374 dl->d_nsectors = sc->nsect > 63 ? 63 : sc->nsect; 375 dl->d_ntracks = 1; 376 dl->d_secpercyl = dl->d_nsectors * dl->d_ntracks; 377 dl->d_secperunit = sc->nsect; 378 dl->d_ncylinders = dl->d_secperunit / dl->d_secpercyl; 379 sc->opencount++; 380 return (0); 381 } 382 383 static int 384 mdclose(dev_t dev, int flags, int fmt, struct thread *td) 385 { 386 struct md_s *sc = dev->si_drv1; 387 388 sc->opencount--; 389 return (0); 390 } 391 392 static int 393 mdioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 394 { 395 396 if (md_debug) 397 printf("mdioctl(%s %lx %p %x %p)\n", 398 devtoname(dev), cmd, addr, flags, td); 399 400 return (ENOIOCTL); 401 } 402 403 static int 404 mdstart_malloc(struct md_s *sc, struct bio *bp) 405 { 406 int i, error; 407 u_char *dst; 408 unsigned secno, nsec, uc; 409 uintptr_t sp, osp; 410 411 nsec = bp->bio_bcount / sc->secsize; 412 secno = bp->bio_pblkno; 413 dst = bp->bio_data; 414 error = 0; 415 while (nsec--) { 416 osp = s_read(sc->indir, secno); 417 if (bp->bio_cmd == BIO_DELETE) { 418 if (osp != 0) 419 error = s_write(sc->indir, secno, 0); 420 } else if (bp->bio_cmd == BIO_READ) { 421 if (osp == 0) 422 bzero(dst, sc->secsize); 423 else if (osp <= 255) 424 for (i = 0; i < sc->secsize; i++) 425 dst[i] = osp; 426 else 427 bcopy((void *)osp, dst, sc->secsize); 428 osp = 0; 429 } else if (bp->bio_cmd == BIO_WRITE) { 430 if (sc->flags & MD_COMPRESS) { 431 uc = dst[0]; 432 for (i = 1; i < sc->secsize; i++) 433 if (dst[i] != uc) 434 break; 435 } else { 436 i = 0; 437 uc = 0; 438 } 439 if (i == sc->secsize) { 440 if (osp != uc) 441 error = s_write(sc->indir, secno, uc); 442 } else { 443 if (osp <= 255) { 444 sp = (uintptr_t) uma_zalloc( 445 sc->uma, M_NOWAIT); 446 if (sp == 0) { 447 error = ENOSPC; 448 break; 449 } 450 bcopy(dst, (void *)sp, sc->secsize); 451 error = s_write(sc->indir, secno, sp); 452 } else { 453 bcopy(dst, (void *)osp, sc->secsize); 454 osp = 0; 455 } 456 } 457 } else { 458 error = EOPNOTSUPP; 459 } 460 if (osp > 255) 461 uma_zfree(sc->uma, (void*)osp); 462 if (error) 463 break; 464 secno++; 465 dst += sc->secsize; 466 } 467 bp->bio_resid = 0; 468 return (error); 469 } 470 471 static int 472 mdstart_preload(struct md_s *sc, struct bio *bp) 473 { 474 475 if (bp->bio_cmd == BIO_DELETE) { 476 } else if (bp->bio_cmd == BIO_READ) { 477 bcopy(sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_data, bp->bio_bcount); 478 } else { 479 bcopy(bp->bio_data, sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_bcount); 480 } 481 bp->bio_resid = 0; 482 return (0); 483 } 484 485 static int 486 mdstart_vnode(struct md_s *sc, struct bio *bp) 487 { 488 int error; 489 struct uio auio; 490 struct iovec aiov; 491 struct mount *mp; 492 493 /* 494 * VNODE I/O 495 * 496 * If an error occurs, we set BIO_ERROR but we do not set 497 * B_INVAL because (for a write anyway), the buffer is 498 * still valid. 499 */ 500 501 bzero(&auio, sizeof(auio)); 502 503 aiov.iov_base = bp->bio_data; 504 aiov.iov_len = bp->bio_bcount; 505 auio.uio_iov = &aiov; 506 auio.uio_iovcnt = 1; 507 auio.uio_offset = (vm_ooffset_t)bp->bio_pblkno * sc->secsize; 508 auio.uio_segflg = UIO_SYSSPACE; 509 if(bp->bio_cmd == BIO_READ) 510 auio.uio_rw = UIO_READ; 511 else 512 auio.uio_rw = UIO_WRITE; 513 auio.uio_resid = bp->bio_bcount; 514 auio.uio_td = curthread; 515 /* 516 * When reading set IO_DIRECT to try to avoid double-caching 517 * the data. When writing IO_DIRECT is not optimal, but we 518 * must set IO_NOWDRAIN to avoid a wdrain deadlock. 519 */ 520 if (bp->bio_cmd == BIO_READ) { 521 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 522 error = VOP_READ(sc->vnode, &auio, IO_DIRECT, sc->cred); 523 } else { 524 (void) vn_start_write(sc->vnode, &mp, V_WAIT); 525 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 526 error = VOP_WRITE(sc->vnode, &auio, IO_NOWDRAIN, sc->cred); 527 vn_finished_write(mp); 528 } 529 VOP_UNLOCK(sc->vnode, 0, curthread); 530 bp->bio_resid = auio.uio_resid; 531 return (error); 532 } 533 534 static int 535 mdstart_swap(struct md_s *sc, struct bio *bp) 536 { 537 538 if ((bp->bio_cmd == BIO_DELETE) && (sc->flags & MD_RESERVE)) 539 biodone(bp); 540 else 541 vm_pager_strategy(sc->object, bp); 542 return (-1); 543 } 544 545 static void 546 mdstrategy(struct bio *bp) 547 { 548 struct md_s *sc; 549 550 if (md_debug > 1) 551 printf("mdstrategy(%p) %s %x, %lld, %ld, %p)\n", 552 (void *)bp, devtoname(bp->bio_dev), bp->bio_flags, 553 (long long)bp->bio_blkno, bp->bio_bcount / DEV_BSIZE, 554 (void *)bp->bio_data); 555 556 sc = bp->bio_dev->si_drv1; 557 558 /* XXX: LOCK(sc->lock) */ 559 bioqdisksort(&sc->bio_queue, bp); 560 /* XXX: UNLOCK(sc->lock) */ 561 562 wakeup(sc); 563 } 564 565 static void 566 md_kthread(void *arg) 567 { 568 struct md_s *sc; 569 struct bio *bp; 570 int error; 571 572 sc = arg; 573 curthread->td_base_pri = PRIBIO; 574 575 mtx_lock(&Giant); 576 for (;;) { 577 /* XXX: LOCK(unique unit numbers) */ 578 bp = bioq_first(&sc->bio_queue); 579 if (bp) 580 bioq_remove(&sc->bio_queue, bp); 581 /* XXX: UNLOCK(unique unit numbers) */ 582 if (!bp) { 583 tsleep(sc, PRIBIO, "mdwait", 0); 584 if (sc->flags & MD_SHUTDOWN) { 585 sc->procp = NULL; 586 wakeup(&sc->procp); 587 kthread_exit(0); 588 } 589 continue; 590 } 591 592 switch (sc->type) { 593 case MD_MALLOC: 594 devstat_start_transaction(&sc->stats); 595 error = mdstart_malloc(sc, bp); 596 break; 597 case MD_PRELOAD: 598 devstat_start_transaction(&sc->stats); 599 error = mdstart_preload(sc, bp); 600 break; 601 case MD_VNODE: 602 devstat_start_transaction(&sc->stats); 603 error = mdstart_vnode(sc, bp); 604 break; 605 case MD_SWAP: 606 error = mdstart_swap(sc, bp); 607 break; 608 default: 609 panic("Impossible md(type)"); 610 break; 611 } 612 613 if (error != -1) 614 biofinish(bp, &sc->stats, error); 615 } 616 } 617 618 static struct md_s * 619 mdfind(int unit) 620 { 621 struct md_s *sc; 622 623 /* XXX: LOCK(unique unit numbers) */ 624 LIST_FOREACH(sc, &md_softc_list, list) { 625 if (sc->unit == unit) 626 break; 627 } 628 /* XXX: UNLOCK(unique unit numbers) */ 629 return (sc); 630 } 631 632 static struct md_s * 633 mdnew(int unit) 634 { 635 struct md_s *sc; 636 int error, max = -1; 637 638 /* XXX: LOCK(unique unit numbers) */ 639 LIST_FOREACH(sc, &md_softc_list, list) { 640 if (sc->unit == unit) { 641 /* XXX: UNLOCK(unique unit numbers) */ 642 return (NULL); 643 } 644 if (sc->unit > max) 645 max = sc->unit; 646 } 647 if (unit == -1) 648 unit = max + 1; 649 if (unit > DKMAXUNIT) 650 return (NULL); 651 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 652 sc->unit = unit; 653 sprintf(sc->name, "md%d", unit); 654 error = kthread_create(md_kthread, sc, &sc->procp, 0, "%s", sc->name); 655 if (error) { 656 free(sc, M_MD); 657 return (NULL); 658 } 659 LIST_INSERT_HEAD(&md_softc_list, sc, list); 660 /* XXX: UNLOCK(unique unit numbers) */ 661 return (sc); 662 } 663 664 static void 665 mdinit(struct md_s *sc) 666 { 667 668 bioq_init(&sc->bio_queue); 669 devstat_add_entry(&sc->stats, MD_NAME, sc->unit, sc->secsize, 670 DEVSTAT_NO_ORDERED_TAGS, 671 DEVSTAT_TYPE_DIRECT | DEVSTAT_TYPE_IF_OTHER, 672 DEVSTAT_PRIORITY_OTHER); 673 sc->dev = disk_create(sc->unit, &sc->disk, 0, &md_cdevsw, &mddisk_cdevsw); 674 sc->dev->si_drv1 = sc; 675 } 676 677 /* 678 * XXX: we should check that the range they feed us is mapped. 679 * XXX: we should implement read-only. 680 */ 681 682 static int 683 mdcreate_preload(struct md_ioctl *mdio) 684 { 685 struct md_s *sc; 686 687 if (mdio->md_size == 0) 688 return (EINVAL); 689 if (mdio->md_options & ~(MD_AUTOUNIT)) 690 return (EINVAL); 691 if (mdio->md_options & MD_AUTOUNIT) { 692 sc = mdnew(-1); 693 if (sc == NULL) 694 return (ENOMEM); 695 mdio->md_unit = sc->unit; 696 } else { 697 sc = mdnew(mdio->md_unit); 698 if (sc == NULL) 699 return (EBUSY); 700 } 701 sc->type = MD_PRELOAD; 702 sc->secsize = DEV_BSIZE; 703 sc->nsect = mdio->md_size; 704 sc->flags = mdio->md_options & MD_FORCE; 705 /* Cast to pointer size, then to pointer to avoid warning */ 706 sc->pl_ptr = (u_char *)(uintptr_t)mdio->md_base; 707 sc->pl_len = (mdio->md_size << DEV_BSHIFT); 708 mdinit(sc); 709 return (0); 710 } 711 712 713 static int 714 mdcreate_malloc(struct md_ioctl *mdio) 715 { 716 struct md_s *sc; 717 off_t u; 718 uintptr_t sp; 719 int error; 720 721 error = 0; 722 if (mdio->md_size == 0) 723 return (EINVAL); 724 if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 725 return (EINVAL); 726 /* Compression doesn't make sense if we have reserved space */ 727 if (mdio->md_options & MD_RESERVE) 728 mdio->md_options &= ~MD_COMPRESS; 729 if (mdio->md_options & MD_AUTOUNIT) { 730 sc = mdnew(-1); 731 if (sc == NULL) 732 return (ENOMEM); 733 mdio->md_unit = sc->unit; 734 } else { 735 sc = mdnew(mdio->md_unit); 736 if (sc == NULL) 737 return (EBUSY); 738 } 739 sc->type = MD_MALLOC; 740 sc->secsize = DEV_BSIZE; 741 sc->nsect = mdio->md_size; 742 sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE); 743 sc->indir = dimension(sc->nsect); 744 sc->uma = uma_zcreate(sc->name, sc->secsize, 745 NULL, NULL, NULL, NULL, 0x1ff, 0); 746 if (mdio->md_options & MD_RESERVE) { 747 for (u = 0; u < sc->nsect; u++) { 748 sp = (uintptr_t) uma_zalloc(sc->uma, M_NOWAIT | M_ZERO); 749 if (sp != 0) 750 error = s_write(sc->indir, u, sp); 751 else 752 error = ENOMEM; 753 if (error) 754 break; 755 } 756 } 757 if (!error) { 758 printf("%s%d: Malloc disk\n", MD_NAME, sc->unit); 759 mdinit(sc); 760 } else 761 mddestroy(sc, NULL); 762 return (error); 763 } 764 765 766 static int 767 mdsetcred(struct md_s *sc, struct ucred *cred) 768 { 769 char *tmpbuf; 770 int error = 0; 771 772 /* 773 * Set credits in our softc 774 */ 775 776 if (sc->cred) 777 crfree(sc->cred); 778 sc->cred = crhold(cred); 779 780 /* 781 * Horrible kludge to establish credentials for NFS XXX. 782 */ 783 784 if (sc->vnode) { 785 struct uio auio; 786 struct iovec aiov; 787 788 tmpbuf = malloc(sc->secsize, M_TEMP, M_WAITOK); 789 bzero(&auio, sizeof(auio)); 790 791 aiov.iov_base = tmpbuf; 792 aiov.iov_len = sc->secsize; 793 auio.uio_iov = &aiov; 794 auio.uio_iovcnt = 1; 795 auio.uio_offset = 0; 796 auio.uio_rw = UIO_READ; 797 auio.uio_segflg = UIO_SYSSPACE; 798 auio.uio_resid = aiov.iov_len; 799 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 800 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 801 VOP_UNLOCK(sc->vnode, 0, curthread); 802 free(tmpbuf, M_TEMP); 803 } 804 return (error); 805 } 806 807 static int 808 mdcreate_vnode(struct md_ioctl *mdio, struct thread *td) 809 { 810 struct md_s *sc; 811 struct vattr vattr; 812 struct nameidata nd; 813 int error, flags; 814 815 flags = FREAD|FWRITE; 816 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 817 error = vn_open(&nd, &flags, 0); 818 if (error) { 819 if (error != EACCES && error != EPERM && error != EROFS) 820 return (error); 821 flags &= ~FWRITE; 822 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 823 error = vn_open(&nd, &flags, 0); 824 if (error) 825 return (error); 826 } 827 NDFREE(&nd, NDF_ONLY_PNBUF); 828 if (nd.ni_vp->v_type != VREG || 829 (error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred, td))) { 830 VOP_UNLOCK(nd.ni_vp, 0, td); 831 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 832 return (error ? error : EINVAL); 833 } 834 VOP_UNLOCK(nd.ni_vp, 0, td); 835 836 if (mdio->md_options & MD_AUTOUNIT) { 837 sc = mdnew(-1); 838 mdio->md_unit = sc->unit; 839 } else { 840 sc = mdnew(mdio->md_unit); 841 } 842 if (sc == NULL) { 843 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 844 return (EBUSY); 845 } 846 847 sc->type = MD_VNODE; 848 sc->flags = mdio->md_options & MD_FORCE; 849 if (!(flags & FWRITE)) 850 sc->flags |= MD_READONLY; 851 sc->secsize = DEV_BSIZE; 852 sc->vnode = nd.ni_vp; 853 854 /* 855 * If the size is specified, override the file attributes. 856 */ 857 if (mdio->md_size) 858 sc->nsect = mdio->md_size; 859 else 860 sc->nsect = vattr.va_size / sc->secsize; /* XXX: round up ? */ 861 if (sc->nsect == 0) { 862 mddestroy(sc, td); 863 return (EINVAL); 864 } 865 error = mdsetcred(sc, td->td_ucred); 866 if (error) { 867 mddestroy(sc, td); 868 return (error); 869 } 870 mdinit(sc); 871 return (0); 872 } 873 874 static int 875 mddestroy(struct md_s *sc, struct thread *td) 876 { 877 878 GIANT_REQUIRED; 879 880 if (sc->dev != NULL) { 881 devstat_remove_entry(&sc->stats); 882 disk_destroy(sc->dev); 883 } 884 sc->flags |= MD_SHUTDOWN; 885 wakeup(sc); 886 while (sc->procp != NULL) 887 tsleep(&sc->procp, PRIBIO, "mddestroy", hz / 10); 888 if (sc->vnode != NULL) 889 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 890 FREAD : (FREAD|FWRITE), sc->cred, td); 891 if (sc->cred != NULL) 892 crfree(sc->cred); 893 if (sc->object != NULL) { 894 vm_pager_deallocate(sc->object); 895 } 896 if (sc->indir) 897 destroy_indir(sc, sc->indir); 898 if (sc->uma) 899 uma_zdestroy(sc->uma); 900 901 /* XXX: LOCK(unique unit numbers) */ 902 LIST_REMOVE(sc, list); 903 /* XXX: UNLOCK(unique unit numbers) */ 904 free(sc, M_MD); 905 return (0); 906 } 907 908 static int 909 mdcreate_swap(struct md_ioctl *mdio, struct thread *td) 910 { 911 int error; 912 struct md_s *sc; 913 914 GIANT_REQUIRED; 915 916 if (mdio->md_options & MD_AUTOUNIT) { 917 sc = mdnew(-1); 918 mdio->md_unit = sc->unit; 919 } else { 920 sc = mdnew(mdio->md_unit); 921 } 922 if (sc == NULL) 923 return (EBUSY); 924 925 sc->type = MD_SWAP; 926 927 /* 928 * Range check. Disallow negative sizes or any size less then the 929 * size of a page. Then round to a page. 930 */ 931 932 if (mdio->md_size == 0) { 933 mddestroy(sc, td); 934 return (EDOM); 935 } 936 937 /* 938 * Allocate an OBJT_SWAP object. 939 * 940 * sc_secsize is PAGE_SIZE'd 941 * 942 * mdio->size is in DEV_BSIZE'd chunks. 943 * Note the truncation. 944 */ 945 946 sc->secsize = PAGE_SIZE; 947 sc->nsect = mdio->md_size / (PAGE_SIZE / DEV_BSIZE); 948 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, sc->secsize * (vm_offset_t)sc->nsect, VM_PROT_DEFAULT, 0); 949 sc->flags = mdio->md_options & MD_FORCE; 950 if (mdio->md_options & MD_RESERVE) { 951 if (swap_pager_reserve(sc->object, 0, sc->nsect) < 0) { 952 vm_pager_deallocate(sc->object); 953 sc->object = NULL; 954 mddestroy(sc, td); 955 return (EDOM); 956 } 957 } 958 error = mdsetcred(sc, td->td_ucred); 959 if (error) 960 mddestroy(sc, td); 961 else 962 mdinit(sc); 963 return (error); 964 } 965 966 static int 967 mddetach(int unit, struct thread *td) 968 { 969 struct md_s *sc; 970 971 sc = mdfind(unit); 972 if (sc == NULL) 973 return (ENOENT); 974 if (sc->opencount != 0 && !(sc->flags & MD_FORCE)) 975 return (EBUSY); 976 switch(sc->type) { 977 case MD_VNODE: 978 case MD_SWAP: 979 case MD_MALLOC: 980 case MD_PRELOAD: 981 return (mddestroy(sc, td)); 982 default: 983 return (EOPNOTSUPP); 984 } 985 } 986 987 static int 988 mdctlioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 989 { 990 struct md_ioctl *mdio; 991 struct md_s *sc; 992 993 if (md_debug) 994 printf("mdctlioctl(%s %lx %p %x %p)\n", 995 devtoname(dev), cmd, addr, flags, td); 996 997 /* 998 * We assert the version number in the individual ioctl 999 * handlers instead of out here because (a) it is possible we 1000 * may add another ioctl in the future which doesn't read an 1001 * mdio, and (b) the correct return value for an unknown ioctl 1002 * is ENOIOCTL, not EINVAL. 1003 */ 1004 mdio = (struct md_ioctl *)addr; 1005 switch (cmd) { 1006 case MDIOCATTACH: 1007 if (mdio->md_version != MDIOVERSION) 1008 return (EINVAL); 1009 switch (mdio->md_type) { 1010 case MD_MALLOC: 1011 return (mdcreate_malloc(mdio)); 1012 case MD_PRELOAD: 1013 return (mdcreate_preload(mdio)); 1014 case MD_VNODE: 1015 return (mdcreate_vnode(mdio, td)); 1016 case MD_SWAP: 1017 return (mdcreate_swap(mdio, td)); 1018 default: 1019 return (EINVAL); 1020 } 1021 case MDIOCDETACH: 1022 if (mdio->md_version != MDIOVERSION) 1023 return (EINVAL); 1024 if (mdio->md_file != NULL || mdio->md_size != 0 || 1025 mdio->md_options != 0) 1026 return (EINVAL); 1027 return (mddetach(mdio->md_unit, td)); 1028 case MDIOCQUERY: 1029 if (mdio->md_version != MDIOVERSION) 1030 return (EINVAL); 1031 sc = mdfind(mdio->md_unit); 1032 if (sc == NULL) 1033 return (ENOENT); 1034 mdio->md_type = sc->type; 1035 mdio->md_options = sc->flags; 1036 switch (sc->type) { 1037 case MD_MALLOC: 1038 mdio->md_size = sc->nsect; 1039 break; 1040 case MD_PRELOAD: 1041 mdio->md_size = sc->nsect; 1042 (u_char *)(uintptr_t)mdio->md_base = sc->pl_ptr; 1043 break; 1044 case MD_SWAP: 1045 mdio->md_size = sc->nsect * (PAGE_SIZE / DEV_BSIZE); 1046 break; 1047 case MD_VNODE: 1048 mdio->md_size = sc->nsect; 1049 /* XXX fill this in */ 1050 mdio->md_file = NULL; 1051 break; 1052 } 1053 return (0); 1054 default: 1055 return (ENOIOCTL); 1056 }; 1057 return (ENOIOCTL); 1058 } 1059 1060 static void 1061 md_preloaded(u_char *image, unsigned length) 1062 { 1063 struct md_s *sc; 1064 1065 sc = mdnew(-1); 1066 if (sc == NULL) 1067 return; 1068 sc->type = MD_PRELOAD; 1069 sc->secsize = DEV_BSIZE; 1070 sc->nsect = length / DEV_BSIZE; 1071 sc->pl_ptr = image; 1072 sc->pl_len = length; 1073 if (sc->unit == 0) 1074 mdrootready = 1; 1075 mdinit(sc); 1076 } 1077 1078 static void 1079 md_drvinit(void *unused) 1080 { 1081 1082 caddr_t mod; 1083 caddr_t c; 1084 u_char *ptr, *name, *type; 1085 unsigned len; 1086 1087 #ifdef MD_ROOT_SIZE 1088 md_preloaded(mfs_root, MD_ROOT_SIZE*1024); 1089 #endif 1090 mod = NULL; 1091 while ((mod = preload_search_next_name(mod)) != NULL) { 1092 name = (char *)preload_search_info(mod, MODINFO_NAME); 1093 type = (char *)preload_search_info(mod, MODINFO_TYPE); 1094 if (name == NULL) 1095 continue; 1096 if (type == NULL) 1097 continue; 1098 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 1099 continue; 1100 c = preload_search_info(mod, MODINFO_ADDR); 1101 ptr = *(u_char **)c; 1102 c = preload_search_info(mod, MODINFO_SIZE); 1103 len = *(unsigned *)c; 1104 printf("%s%d: Preloaded image <%s> %d bytes at %p\n", 1105 MD_NAME, mdunits, name, len, ptr); 1106 md_preloaded(ptr, len); 1107 } 1108 status_dev = make_dev(&mdctl_cdevsw, 0xffff00ff, UID_ROOT, GID_WHEEL, 1109 0600, MDCTL_NAME); 1110 } 1111 1112 static int 1113 md_modevent(module_t mod, int type, void *data) 1114 { 1115 int error; 1116 struct md_s *sc; 1117 1118 switch (type) { 1119 case MOD_LOAD: 1120 md_drvinit(NULL); 1121 break; 1122 case MOD_UNLOAD: 1123 LIST_FOREACH(sc, &md_softc_list, list) { 1124 error = mddetach(sc->unit, curthread); 1125 if (error != 0) 1126 return (error); 1127 } 1128 if (status_dev) 1129 destroy_dev(status_dev); 1130 status_dev = 0; 1131 break; 1132 default: 1133 break; 1134 } 1135 return (0); 1136 } 1137 1138 static moduledata_t md_mod = { 1139 MD_NAME, 1140 md_modevent, 1141 NULL 1142 }; 1143 DECLARE_MODULE(md, md_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE+CDEV_MAJOR); 1144 MODULE_VERSION(md, MD_MODVER); 1145 1146 1147 #ifdef MD_ROOT 1148 static void 1149 md_takeroot(void *junk) 1150 { 1151 if (mdrootready) 1152 rootdevnames[0] = "ufs:/dev/md0c"; 1153 } 1154 1155 SYSINIT(md_root, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, md_takeroot, NULL); 1156 #endif 1157