Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/dev/md/md.c
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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: releng/5.0/sys/dev/md/md.c 107423 2002-11-30 22:03:53Z iedowse $ 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 (ENOSPC); 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] = 0; 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; 363 364 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 sc->disk.d_sectorsize = sc->secsize; 371 sc->disk.d_mediasize = (off_t)sc->nsect * sc->secsize; 372 sc->disk.d_fwsectors = sc->nsect > 63 ? 63 : sc->nsect; 373 sc->disk.d_fwheads = 1; 374 sc->opencount++; 375 return (0); 376 } 377 378 static int 379 mdclose(dev_t dev, int flags, int fmt, struct thread *td) 380 { 381 struct md_s *sc = dev->si_drv1; 382 383 sc->opencount--; 384 return (0); 385 } 386 387 static int 388 mdioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 389 { 390 391 if (md_debug) 392 printf("mdioctl(%s %lx %p %x %p)\n", 393 devtoname(dev), cmd, addr, flags, td); 394 395 return (ENOIOCTL); 396 } 397 398 static int 399 mdstart_malloc(struct md_s *sc, struct bio *bp) 400 { 401 int i, error; 402 u_char *dst; 403 unsigned secno, nsec, uc; 404 uintptr_t sp, osp; 405 406 nsec = bp->bio_bcount / sc->secsize; 407 secno = bp->bio_pblkno; 408 dst = bp->bio_data; 409 error = 0; 410 while (nsec--) { 411 osp = s_read(sc->indir, secno); 412 if (bp->bio_cmd == BIO_DELETE) { 413 if (osp != 0) 414 error = s_write(sc->indir, secno, 0); 415 } else if (bp->bio_cmd == BIO_READ) { 416 if (osp == 0) 417 bzero(dst, sc->secsize); 418 else if (osp <= 255) 419 for (i = 0; i < sc->secsize; i++) 420 dst[i] = osp; 421 else 422 bcopy((void *)osp, dst, sc->secsize); 423 osp = 0; 424 } else if (bp->bio_cmd == BIO_WRITE) { 425 if (sc->flags & MD_COMPRESS) { 426 uc = dst[0]; 427 for (i = 1; i < sc->secsize; i++) 428 if (dst[i] != uc) 429 break; 430 } else { 431 i = 0; 432 uc = 0; 433 } 434 if (i == sc->secsize) { 435 if (osp != uc) 436 error = s_write(sc->indir, secno, uc); 437 } else { 438 if (osp <= 255) { 439 sp = (uintptr_t) uma_zalloc( 440 sc->uma, M_NOWAIT); 441 if (sp == 0) { 442 error = ENOSPC; 443 break; 444 } 445 bcopy(dst, (void *)sp, sc->secsize); 446 error = s_write(sc->indir, secno, sp); 447 } else { 448 bcopy(dst, (void *)osp, sc->secsize); 449 osp = 0; 450 } 451 } 452 } else { 453 error = EOPNOTSUPP; 454 } 455 if (osp > 255) 456 uma_zfree(sc->uma, (void*)osp); 457 if (error) 458 break; 459 secno++; 460 dst += sc->secsize; 461 } 462 bp->bio_resid = 0; 463 return (error); 464 } 465 466 static int 467 mdstart_preload(struct md_s *sc, struct bio *bp) 468 { 469 470 if (bp->bio_cmd == BIO_DELETE) { 471 } else if (bp->bio_cmd == BIO_READ) { 472 bcopy(sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_data, bp->bio_bcount); 473 } else { 474 bcopy(bp->bio_data, sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_bcount); 475 } 476 bp->bio_resid = 0; 477 return (0); 478 } 479 480 static int 481 mdstart_vnode(struct md_s *sc, struct bio *bp) 482 { 483 int error; 484 struct uio auio; 485 struct iovec aiov; 486 struct mount *mp; 487 488 /* 489 * VNODE I/O 490 * 491 * If an error occurs, we set BIO_ERROR but we do not set 492 * B_INVAL because (for a write anyway), the buffer is 493 * still valid. 494 */ 495 496 bzero(&auio, sizeof(auio)); 497 498 aiov.iov_base = bp->bio_data; 499 aiov.iov_len = bp->bio_bcount; 500 auio.uio_iov = &aiov; 501 auio.uio_iovcnt = 1; 502 auio.uio_offset = (vm_ooffset_t)bp->bio_pblkno * sc->secsize; 503 auio.uio_segflg = UIO_SYSSPACE; 504 if(bp->bio_cmd == BIO_READ) 505 auio.uio_rw = UIO_READ; 506 else 507 auio.uio_rw = UIO_WRITE; 508 auio.uio_resid = bp->bio_bcount; 509 auio.uio_td = curthread; 510 /* 511 * When reading set IO_DIRECT to try to avoid double-caching 512 * the data. When writing IO_DIRECT is not optimal, but we 513 * must set IO_NOWDRAIN to avoid a wdrain deadlock. 514 */ 515 if (bp->bio_cmd == BIO_READ) { 516 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 517 error = VOP_READ(sc->vnode, &auio, IO_DIRECT, sc->cred); 518 } else { 519 (void) vn_start_write(sc->vnode, &mp, V_WAIT); 520 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 521 error = VOP_WRITE(sc->vnode, &auio, IO_NOWDRAIN, sc->cred); 522 vn_finished_write(mp); 523 } 524 VOP_UNLOCK(sc->vnode, 0, curthread); 525 bp->bio_resid = auio.uio_resid; 526 return (error); 527 } 528 529 static int 530 mdstart_swap(struct md_s *sc, struct bio *bp) 531 { 532 533 if ((bp->bio_cmd == BIO_DELETE) && (sc->flags & MD_RESERVE)) 534 biodone(bp); 535 else 536 vm_pager_strategy(sc->object, bp); 537 return (-1); 538 } 539 540 static void 541 mdstrategy(struct bio *bp) 542 { 543 struct md_s *sc; 544 545 if (md_debug > 1) 546 printf("mdstrategy(%p) %s %x, %jd, %jd %ld, %p)\n", 547 (void *)bp, devtoname(bp->bio_dev), bp->bio_flags, 548 (intmax_t)bp->bio_blkno, 549 (intmax_t)bp->bio_pblkno, 550 bp->bio_bcount / DEV_BSIZE, 551 (void *)bp->bio_data); 552 553 sc = bp->bio_dev->si_drv1; 554 555 /* XXX: LOCK(sc->lock) */ 556 bioqdisksort(&sc->bio_queue, bp); 557 /* XXX: UNLOCK(sc->lock) */ 558 559 wakeup(sc); 560 } 561 562 static void 563 md_kthread(void *arg) 564 { 565 struct md_s *sc; 566 struct bio *bp; 567 int error; 568 569 sc = arg; 570 curthread->td_base_pri = PRIBIO; 571 572 mtx_lock(&Giant); 573 for (;;) { 574 /* XXX: LOCK(unique unit numbers) */ 575 bp = bioq_first(&sc->bio_queue); 576 if (bp) 577 bioq_remove(&sc->bio_queue, bp); 578 /* XXX: UNLOCK(unique unit numbers) */ 579 if (!bp) { 580 if (sc->flags & MD_SHUTDOWN) { 581 sc->procp = NULL; 582 wakeup(&sc->procp); 583 kthread_exit(0); 584 } 585 tsleep(sc, PRIBIO, "mdwait", 0); 586 continue; 587 } 588 589 switch (sc->type) { 590 case MD_MALLOC: 591 devstat_start_transaction(&sc->stats); 592 error = mdstart_malloc(sc, bp); 593 break; 594 case MD_PRELOAD: 595 devstat_start_transaction(&sc->stats); 596 error = mdstart_preload(sc, bp); 597 break; 598 case MD_VNODE: 599 devstat_start_transaction(&sc->stats); 600 error = mdstart_vnode(sc, bp); 601 break; 602 case MD_SWAP: 603 error = mdstart_swap(sc, bp); 604 break; 605 default: 606 panic("Impossible md(type)"); 607 break; 608 } 609 610 if (error != -1) 611 biofinish(bp, &sc->stats, error); 612 } 613 } 614 615 static struct md_s * 616 mdfind(int unit) 617 { 618 struct md_s *sc; 619 620 /* XXX: LOCK(unique unit numbers) */ 621 LIST_FOREACH(sc, &md_softc_list, list) { 622 if (sc->unit == unit) 623 break; 624 } 625 /* XXX: UNLOCK(unique unit numbers) */ 626 return (sc); 627 } 628 629 static struct md_s * 630 mdnew(int unit) 631 { 632 struct md_s *sc; 633 int error, max = -1; 634 635 /* XXX: LOCK(unique unit numbers) */ 636 LIST_FOREACH(sc, &md_softc_list, list) { 637 if (sc->unit == unit) { 638 /* XXX: UNLOCK(unique unit numbers) */ 639 return (NULL); 640 } 641 if (sc->unit > max) 642 max = sc->unit; 643 } 644 if (unit == -1) 645 unit = max + 1; 646 if (unit > 255) 647 return (NULL); 648 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 649 sc->unit = unit; 650 sprintf(sc->name, "md%d", unit); 651 error = kthread_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 652 if (error) { 653 free(sc, M_MD); 654 return (NULL); 655 } 656 LIST_INSERT_HEAD(&md_softc_list, sc, list); 657 /* XXX: UNLOCK(unique unit numbers) */ 658 return (sc); 659 } 660 661 static void 662 mdinit(struct md_s *sc) 663 { 664 665 bioq_init(&sc->bio_queue); 666 devstat_add_entry(&sc->stats, MD_NAME, sc->unit, sc->secsize, 667 DEVSTAT_NO_ORDERED_TAGS, 668 DEVSTAT_TYPE_DIRECT | DEVSTAT_TYPE_IF_OTHER, 669 DEVSTAT_PRIORITY_OTHER); 670 sc->dev = disk_create(sc->unit, &sc->disk, 0, &md_cdevsw, &mddisk_cdevsw); 671 sc->dev->si_drv1 = sc; 672 } 673 674 /* 675 * XXX: we should check that the range they feed us is mapped. 676 * XXX: we should implement read-only. 677 */ 678 679 static int 680 mdcreate_preload(struct md_ioctl *mdio) 681 { 682 struct md_s *sc; 683 684 if (mdio->md_size == 0) 685 return (EINVAL); 686 if (mdio->md_options & ~(MD_AUTOUNIT)) 687 return (EINVAL); 688 if (mdio->md_options & MD_AUTOUNIT) { 689 sc = mdnew(-1); 690 if (sc == NULL) 691 return (ENOMEM); 692 mdio->md_unit = sc->unit; 693 } else { 694 sc = mdnew(mdio->md_unit); 695 if (sc == NULL) 696 return (EBUSY); 697 } 698 sc->type = MD_PRELOAD; 699 sc->secsize = DEV_BSIZE; 700 sc->nsect = mdio->md_size; 701 sc->flags = mdio->md_options & MD_FORCE; 702 /* Cast to pointer size, then to pointer to avoid warning */ 703 sc->pl_ptr = (u_char *)(uintptr_t)mdio->md_base; 704 sc->pl_len = (mdio->md_size << DEV_BSHIFT); 705 mdinit(sc); 706 return (0); 707 } 708 709 710 static int 711 mdcreate_malloc(struct md_ioctl *mdio) 712 { 713 struct md_s *sc; 714 off_t u; 715 uintptr_t sp; 716 int error; 717 718 error = 0; 719 if (mdio->md_size == 0) 720 return (EINVAL); 721 if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 722 return (EINVAL); 723 /* Compression doesn't make sense if we have reserved space */ 724 if (mdio->md_options & MD_RESERVE) 725 mdio->md_options &= ~MD_COMPRESS; 726 if (mdio->md_options & MD_AUTOUNIT) { 727 sc = mdnew(-1); 728 if (sc == NULL) 729 return (ENOMEM); 730 mdio->md_unit = sc->unit; 731 } else { 732 sc = mdnew(mdio->md_unit); 733 if (sc == NULL) 734 return (EBUSY); 735 } 736 sc->type = MD_MALLOC; 737 sc->secsize = DEV_BSIZE; 738 sc->nsect = mdio->md_size; 739 sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE); 740 sc->indir = dimension(sc->nsect); 741 sc->uma = uma_zcreate(sc->name, sc->secsize, 742 NULL, NULL, NULL, NULL, 0x1ff, 0); 743 if (mdio->md_options & MD_RESERVE) { 744 for (u = 0; u < sc->nsect; u++) { 745 sp = (uintptr_t) uma_zalloc(sc->uma, M_NOWAIT | M_ZERO); 746 if (sp != 0) 747 error = s_write(sc->indir, u, sp); 748 else 749 error = ENOMEM; 750 if (error) 751 break; 752 } 753 } 754 if (!error) { 755 printf("%s%d: Malloc disk\n", MD_NAME, sc->unit); 756 mdinit(sc); 757 } else 758 mddestroy(sc, NULL); 759 return (error); 760 } 761 762 763 static int 764 mdsetcred(struct md_s *sc, struct ucred *cred) 765 { 766 char *tmpbuf; 767 int error = 0; 768 769 /* 770 * Set credits in our softc 771 */ 772 773 if (sc->cred) 774 crfree(sc->cred); 775 sc->cred = crhold(cred); 776 777 /* 778 * Horrible kludge to establish credentials for NFS XXX. 779 */ 780 781 if (sc->vnode) { 782 struct uio auio; 783 struct iovec aiov; 784 785 tmpbuf = malloc(sc->secsize, M_TEMP, M_WAITOK); 786 bzero(&auio, sizeof(auio)); 787 788 aiov.iov_base = tmpbuf; 789 aiov.iov_len = sc->secsize; 790 auio.uio_iov = &aiov; 791 auio.uio_iovcnt = 1; 792 auio.uio_offset = 0; 793 auio.uio_rw = UIO_READ; 794 auio.uio_segflg = UIO_SYSSPACE; 795 auio.uio_resid = aiov.iov_len; 796 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 797 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 798 VOP_UNLOCK(sc->vnode, 0, curthread); 799 free(tmpbuf, M_TEMP); 800 } 801 return (error); 802 } 803 804 static int 805 mdcreate_vnode(struct md_ioctl *mdio, struct thread *td) 806 { 807 struct md_s *sc; 808 struct vattr vattr; 809 struct nameidata nd; 810 int error, flags; 811 812 flags = FREAD|FWRITE; 813 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 814 error = vn_open(&nd, &flags, 0); 815 if (error) { 816 if (error != EACCES && error != EPERM && error != EROFS) 817 return (error); 818 flags &= ~FWRITE; 819 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 820 error = vn_open(&nd, &flags, 0); 821 if (error) 822 return (error); 823 } 824 NDFREE(&nd, NDF_ONLY_PNBUF); 825 if (nd.ni_vp->v_type != VREG || 826 (error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred, td))) { 827 VOP_UNLOCK(nd.ni_vp, 0, td); 828 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 829 return (error ? error : EINVAL); 830 } 831 VOP_UNLOCK(nd.ni_vp, 0, td); 832 833 if (mdio->md_options & MD_AUTOUNIT) { 834 sc = mdnew(-1); 835 mdio->md_unit = sc->unit; 836 } else { 837 sc = mdnew(mdio->md_unit); 838 } 839 if (sc == NULL) { 840 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 841 return (EBUSY); 842 } 843 844 sc->type = MD_VNODE; 845 sc->flags = mdio->md_options & MD_FORCE; 846 if (!(flags & FWRITE)) 847 sc->flags |= MD_READONLY; 848 sc->secsize = DEV_BSIZE; 849 sc->vnode = nd.ni_vp; 850 851 /* 852 * If the size is specified, override the file attributes. 853 */ 854 if (mdio->md_size) 855 sc->nsect = mdio->md_size; 856 else 857 sc->nsect = vattr.va_size / sc->secsize; /* XXX: round up ? */ 858 if (sc->nsect == 0) { 859 mddestroy(sc, td); 860 return (EINVAL); 861 } 862 error = mdsetcred(sc, td->td_ucred); 863 if (error) { 864 mddestroy(sc, td); 865 return (error); 866 } 867 mdinit(sc); 868 return (0); 869 } 870 871 static int 872 mddestroy(struct md_s *sc, struct thread *td) 873 { 874 875 GIANT_REQUIRED; 876 877 if (sc->dev != NULL) { 878 devstat_remove_entry(&sc->stats); 879 disk_destroy(sc->dev); 880 } 881 sc->flags |= MD_SHUTDOWN; 882 wakeup(sc); 883 while (sc->procp != NULL) 884 tsleep(&sc->procp, PRIBIO, "mddestroy", hz / 10); 885 if (sc->vnode != NULL) 886 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 887 FREAD : (FREAD|FWRITE), sc->cred, td); 888 if (sc->cred != NULL) 889 crfree(sc->cred); 890 if (sc->object != NULL) { 891 vm_pager_deallocate(sc->object); 892 } 893 if (sc->indir) 894 destroy_indir(sc, sc->indir); 895 if (sc->uma) 896 uma_zdestroy(sc->uma); 897 898 /* XXX: LOCK(unique unit numbers) */ 899 LIST_REMOVE(sc, list); 900 /* XXX: UNLOCK(unique unit numbers) */ 901 free(sc, M_MD); 902 return (0); 903 } 904 905 static int 906 mdcreate_swap(struct md_ioctl *mdio, struct thread *td) 907 { 908 int error; 909 struct md_s *sc; 910 911 GIANT_REQUIRED; 912 913 if (mdio->md_options & MD_AUTOUNIT) { 914 sc = mdnew(-1); 915 mdio->md_unit = sc->unit; 916 } else { 917 sc = mdnew(mdio->md_unit); 918 } 919 if (sc == NULL) 920 return (EBUSY); 921 922 sc->type = MD_SWAP; 923 924 /* 925 * Range check. Disallow negative sizes or any size less then the 926 * size of a page. Then round to a page. 927 */ 928 929 if (mdio->md_size == 0) { 930 mddestroy(sc, td); 931 return (EDOM); 932 } 933 934 /* 935 * Allocate an OBJT_SWAP object. 936 * 937 * sc_secsize is PAGE_SIZE'd 938 * 939 * mdio->size is in DEV_BSIZE'd chunks. 940 * Note the truncation. 941 */ 942 943 sc->secsize = PAGE_SIZE; 944 sc->nsect = mdio->md_size / (PAGE_SIZE / DEV_BSIZE); 945 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, sc->secsize * (vm_offset_t)sc->nsect, VM_PROT_DEFAULT, 0); 946 sc->flags = mdio->md_options & MD_FORCE; 947 if (mdio->md_options & MD_RESERVE) { 948 if (swap_pager_reserve(sc->object, 0, sc->nsect) < 0) { 949 vm_pager_deallocate(sc->object); 950 sc->object = NULL; 951 mddestroy(sc, td); 952 return (EDOM); 953 } 954 } 955 error = mdsetcred(sc, td->td_ucred); 956 if (error) 957 mddestroy(sc, td); 958 else 959 mdinit(sc); 960 return (error); 961 } 962 963 static int 964 mddetach(int unit, struct thread *td) 965 { 966 struct md_s *sc; 967 968 sc = mdfind(unit); 969 if (sc == NULL) 970 return (ENOENT); 971 if (sc->opencount != 0 && !(sc->flags & MD_FORCE)) 972 return (EBUSY); 973 switch(sc->type) { 974 case MD_VNODE: 975 case MD_SWAP: 976 case MD_MALLOC: 977 case MD_PRELOAD: 978 return (mddestroy(sc, td)); 979 default: 980 return (EOPNOTSUPP); 981 } 982 } 983 984 static int 985 mdctlioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 986 { 987 struct md_ioctl *mdio; 988 struct md_s *sc; 989 990 if (md_debug) 991 printf("mdctlioctl(%s %lx %p %x %p)\n", 992 devtoname(dev), cmd, addr, flags, td); 993 994 /* 995 * We assert the version number in the individual ioctl 996 * handlers instead of out here because (a) it is possible we 997 * may add another ioctl in the future which doesn't read an 998 * mdio, and (b) the correct return value for an unknown ioctl 999 * is ENOIOCTL, not EINVAL. 1000 */ 1001 mdio = (struct md_ioctl *)addr; 1002 switch (cmd) { 1003 case MDIOCATTACH: 1004 if (mdio->md_version != MDIOVERSION) 1005 return (EINVAL); 1006 switch (mdio->md_type) { 1007 case MD_MALLOC: 1008 return (mdcreate_malloc(mdio)); 1009 case MD_PRELOAD: 1010 return (mdcreate_preload(mdio)); 1011 case MD_VNODE: 1012 return (mdcreate_vnode(mdio, td)); 1013 case MD_SWAP: 1014 return (mdcreate_swap(mdio, td)); 1015 default: 1016 return (EINVAL); 1017 } 1018 case MDIOCDETACH: 1019 if (mdio->md_version != MDIOVERSION) 1020 return (EINVAL); 1021 if (mdio->md_file != NULL || mdio->md_size != 0 || 1022 mdio->md_options != 0) 1023 return (EINVAL); 1024 return (mddetach(mdio->md_unit, td)); 1025 case MDIOCQUERY: 1026 if (mdio->md_version != MDIOVERSION) 1027 return (EINVAL); 1028 sc = mdfind(mdio->md_unit); 1029 if (sc == NULL) 1030 return (ENOENT); 1031 mdio->md_type = sc->type; 1032 mdio->md_options = sc->flags; 1033 switch (sc->type) { 1034 case MD_MALLOC: 1035 mdio->md_size = sc->nsect; 1036 break; 1037 case MD_PRELOAD: 1038 mdio->md_size = sc->nsect; 1039 mdio->md_base = (uint64_t)(intptr_t)sc->pl_ptr; 1040 break; 1041 case MD_SWAP: 1042 mdio->md_size = sc->nsect * (PAGE_SIZE / DEV_BSIZE); 1043 break; 1044 case MD_VNODE: 1045 mdio->md_size = sc->nsect; 1046 /* XXX fill this in */ 1047 mdio->md_file = NULL; 1048 break; 1049 } 1050 return (0); 1051 default: 1052 return (ENOIOCTL); 1053 }; 1054 return (ENOIOCTL); 1055 } 1056 1057 static void 1058 md_preloaded(u_char *image, unsigned length) 1059 { 1060 struct md_s *sc; 1061 1062 sc = mdnew(-1); 1063 if (sc == NULL) 1064 return; 1065 sc->type = MD_PRELOAD; 1066 sc->secsize = DEV_BSIZE; 1067 sc->nsect = length / DEV_BSIZE; 1068 sc->pl_ptr = image; 1069 sc->pl_len = length; 1070 if (sc->unit == 0) 1071 mdrootready = 1; 1072 mdinit(sc); 1073 } 1074 1075 static void 1076 md_drvinit(void *unused) 1077 { 1078 1079 caddr_t mod; 1080 caddr_t c; 1081 u_char *ptr, *name, *type; 1082 unsigned len; 1083 1084 #ifdef MD_ROOT_SIZE 1085 md_preloaded(mfs_root, MD_ROOT_SIZE*1024); 1086 #endif 1087 mod = NULL; 1088 while ((mod = preload_search_next_name(mod)) != NULL) { 1089 name = (char *)preload_search_info(mod, MODINFO_NAME); 1090 type = (char *)preload_search_info(mod, MODINFO_TYPE); 1091 if (name == NULL) 1092 continue; 1093 if (type == NULL) 1094 continue; 1095 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 1096 continue; 1097 c = preload_search_info(mod, MODINFO_ADDR); 1098 ptr = *(u_char **)c; 1099 c = preload_search_info(mod, MODINFO_SIZE); 1100 len = *(size_t *)c; 1101 printf("%s%d: Preloaded image <%s> %d bytes at %p\n", 1102 MD_NAME, mdunits, name, len, ptr); 1103 md_preloaded(ptr, len); 1104 } 1105 status_dev = make_dev(&mdctl_cdevsw, 0xffff00ff, UID_ROOT, GID_WHEEL, 1106 0600, MDCTL_NAME); 1107 } 1108 1109 static int 1110 md_modevent(module_t mod, int type, void *data) 1111 { 1112 int error; 1113 struct md_s *sc; 1114 1115 switch (type) { 1116 case MOD_LOAD: 1117 md_drvinit(NULL); 1118 break; 1119 case MOD_UNLOAD: 1120 LIST_FOREACH(sc, &md_softc_list, list) { 1121 error = mddetach(sc->unit, curthread); 1122 if (error != 0) 1123 return (error); 1124 } 1125 if (status_dev) 1126 destroy_dev(status_dev); 1127 status_dev = 0; 1128 break; 1129 default: 1130 break; 1131 } 1132 return (0); 1133 } 1134 1135 static moduledata_t md_mod = { 1136 MD_NAME, 1137 md_modevent, 1138 NULL 1139 }; 1140 DECLARE_MODULE(md, md_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE+CDEV_MAJOR); 1141 MODULE_VERSION(md, MD_MODVER); 1142 1143 1144 #ifdef MD_ROOT 1145 static void 1146 md_takeroot(void *junk) 1147 { 1148 if (mdrootready) 1149 rootdevnames[0] = "ufs:/dev/md0"; 1150 } 1151 1152 SYSINIT(md_root, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, md_takeroot, NULL); 1153 #endif
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