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_geom.h" 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/fcntl.h> 68 #include <sys/kernel.h> 69 #include <sys/kthread.h> 70 #include <sys/linker.h> 71 #include <sys/lock.h> 72 #include <sys/malloc.h> 73 #include <sys/mdioctl.h> 74 #include <sys/mutex.h> 75 #include <sys/namei.h> 76 #include <sys/proc.h> 77 #include <sys/queue.h> 78 #include <sys/sysctl.h> 79 #include <sys/vnode.h> 80 81 #include <geom/geom.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_ioctl_t mdctlioctl; 117 118 static struct cdevsw mdctl_cdevsw = { 119 .d_open = nullopen, 120 .d_close = nullclose, 121 .d_ioctl = mdctlioctl, 122 .d_name = MD_NAME, 123 .d_maj = CDEV_MAJOR 124 }; 125 126 127 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(&md_softc_list); 128 129 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 130 #define NMASK (NINDIR-1) 131 static int nshift; 132 133 struct indir { 134 uintptr_t *array; 135 uint total; 136 uint used; 137 uint shift; 138 }; 139 140 struct md_s { 141 int unit; 142 LIST_ENTRY(md_s) list; 143 struct bio_queue_head bio_queue; 144 struct mtx queue_mtx; 145 dev_t dev; 146 enum md_types type; 147 unsigned nsect; 148 unsigned opencount; 149 unsigned secsize; 150 unsigned fwheads; 151 unsigned fwsectors; 152 unsigned flags; 153 char name[20]; 154 struct proc *procp; 155 struct g_geom *gp; 156 struct g_provider *pp; 157 158 /* MD_MALLOC related fields */ 159 struct indir *indir; 160 uma_zone_t uma; 161 162 /* MD_PRELOAD related fields */ 163 u_char *pl_ptr; 164 unsigned pl_len; 165 166 /* MD_VNODE related fields */ 167 struct vnode *vnode; 168 struct ucred *cred; 169 170 /* MD_SWAP related fields */ 171 vm_object_t object; 172 }; 173 174 static int mddestroy(struct md_s *sc, struct thread *td); 175 176 static struct indir * 177 new_indir(uint shift) 178 { 179 struct indir *ip; 180 181 ip = malloc(sizeof *ip, M_MD, M_NOWAIT | M_ZERO); 182 if (ip == NULL) 183 return (NULL); 184 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 185 M_MDSECT, M_NOWAIT | M_ZERO); 186 if (ip->array == NULL) { 187 free(ip, M_MD); 188 return (NULL); 189 } 190 ip->total = NINDIR; 191 ip->shift = shift; 192 return (ip); 193 } 194 195 static void 196 del_indir(struct indir *ip) 197 { 198 199 free(ip->array, M_MDSECT); 200 free(ip, M_MD); 201 } 202 203 static void 204 destroy_indir(struct md_s *sc, struct indir *ip) 205 { 206 int i; 207 208 for (i = 0; i < NINDIR; i++) { 209 if (!ip->array[i]) 210 continue; 211 if (ip->shift) 212 destroy_indir(sc, (struct indir*)(ip->array[i])); 213 else if (ip->array[i] > 255) 214 uma_zfree(sc->uma, (void *)(ip->array[i])); 215 } 216 del_indir(ip); 217 } 218 219 /* 220 * This function does the math and alloctes the top level "indir" structure 221 * for a device of "size" sectors. 222 */ 223 224 static struct indir * 225 dimension(off_t size) 226 { 227 off_t rcnt; 228 struct indir *ip; 229 int i, layer; 230 231 rcnt = size; 232 layer = 0; 233 while (rcnt > NINDIR) { 234 rcnt /= NINDIR; 235 layer++; 236 } 237 /* figure out log2(NINDIR) */ 238 for (i = NINDIR, nshift = -1; i; nshift++) 239 i >>= 1; 240 241 /* 242 * XXX: the top layer is probably not fully populated, so we allocate 243 * too much space for ip->array in here. 244 */ 245 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO); 246 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 247 M_MDSECT, M_WAITOK | M_ZERO); 248 ip->total = NINDIR; 249 ip->shift = layer * nshift; 250 return (ip); 251 } 252 253 /* 254 * Read a given sector 255 */ 256 257 static uintptr_t 258 s_read(struct indir *ip, off_t offset) 259 { 260 struct indir *cip; 261 int idx; 262 uintptr_t up; 263 264 if (md_debug > 1) 265 printf("s_read(%jd)\n", (intmax_t)offset); 266 up = 0; 267 for (cip = ip; cip != NULL;) { 268 if (cip->shift) { 269 idx = (offset >> cip->shift) & NMASK; 270 up = cip->array[idx]; 271 cip = (struct indir *)up; 272 continue; 273 } 274 idx = offset & NMASK; 275 return (cip->array[idx]); 276 } 277 return (0); 278 } 279 280 /* 281 * Write a given sector, prune the tree if the value is 0 282 */ 283 284 static int 285 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 286 { 287 struct indir *cip, *lip[10]; 288 int idx, li; 289 uintptr_t up; 290 291 if (md_debug > 1) 292 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 293 up = 0; 294 li = 0; 295 cip = ip; 296 for (;;) { 297 lip[li++] = cip; 298 if (cip->shift) { 299 idx = (offset >> cip->shift) & NMASK; 300 up = cip->array[idx]; 301 if (up != 0) { 302 cip = (struct indir *)up; 303 continue; 304 } 305 /* Allocate branch */ 306 cip->array[idx] = 307 (uintptr_t)new_indir(cip->shift - nshift); 308 if (cip->array[idx] == 0) 309 return (ENOSPC); 310 cip->used++; 311 up = cip->array[idx]; 312 cip = (struct indir *)up; 313 continue; 314 } 315 /* leafnode */ 316 idx = offset & NMASK; 317 up = cip->array[idx]; 318 if (up != 0) 319 cip->used--; 320 cip->array[idx] = ptr; 321 if (ptr != 0) 322 cip->used++; 323 break; 324 } 325 if (cip->used != 0 || li == 1) 326 return (0); 327 li--; 328 while (cip->used == 0 && cip != ip) { 329 li--; 330 idx = (offset >> lip[li]->shift) & NMASK; 331 up = lip[li]->array[idx]; 332 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 333 del_indir(cip); 334 lip[li]->array[idx] = 0; 335 lip[li]->used--; 336 cip = lip[li]; 337 } 338 return (0); 339 } 340 341 342 struct g_class g_md_class = { 343 .name = "MD", 344 }; 345 346 static int 347 g_md_access(struct g_provider *pp, int r, int w, int e) 348 { 349 struct md_s *sc; 350 351 sc = pp->geom->softc; 352 if (sc == NULL) 353 return (ENXIO); 354 r += pp->acr; 355 w += pp->acw; 356 e += pp->ace; 357 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 358 sc->opencount = 1; 359 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 360 sc->opencount = 0; 361 } 362 return (0); 363 } 364 365 static void 366 g_md_start(struct bio *bp) 367 { 368 struct md_s *sc; 369 370 sc = bp->bio_to->geom->softc; 371 372 bp->bio_blkno = bp->bio_offset >> DEV_BSHIFT; 373 bp->bio_pblkno = bp->bio_offset / sc->secsize; 374 bp->bio_bcount = bp->bio_length; 375 mtx_lock(&sc->queue_mtx); 376 bioq_disksort(&sc->bio_queue, bp); 377 mtx_unlock(&sc->queue_mtx); 378 379 wakeup(sc); 380 } 381 382 DECLARE_GEOM_CLASS(g_md_class, g_md); 383 384 385 static int 386 mdstart_malloc(struct md_s *sc, struct bio *bp) 387 { 388 int i, error; 389 u_char *dst; 390 unsigned secno, nsec, uc; 391 uintptr_t sp, osp; 392 393 nsec = bp->bio_bcount / sc->secsize; 394 secno = bp->bio_pblkno; 395 dst = bp->bio_data; 396 error = 0; 397 while (nsec--) { 398 osp = s_read(sc->indir, secno); 399 if (bp->bio_cmd == BIO_DELETE) { 400 if (osp != 0) 401 error = s_write(sc->indir, secno, 0); 402 } else if (bp->bio_cmd == BIO_READ) { 403 if (osp == 0) 404 bzero(dst, sc->secsize); 405 else if (osp <= 255) 406 for (i = 0; i < sc->secsize; i++) 407 dst[i] = osp; 408 else 409 bcopy((void *)osp, dst, sc->secsize); 410 osp = 0; 411 } else if (bp->bio_cmd == BIO_WRITE) { 412 if (sc->flags & MD_COMPRESS) { 413 uc = dst[0]; 414 for (i = 1; i < sc->secsize; i++) 415 if (dst[i] != uc) 416 break; 417 } else { 418 i = 0; 419 uc = 0; 420 } 421 if (i == sc->secsize) { 422 if (osp != uc) 423 error = s_write(sc->indir, secno, uc); 424 } else { 425 if (osp <= 255) { 426 sp = (uintptr_t) uma_zalloc( 427 sc->uma, M_NOWAIT); 428 if (sp == 0) { 429 error = ENOSPC; 430 break; 431 } 432 bcopy(dst, (void *)sp, sc->secsize); 433 error = s_write(sc->indir, secno, sp); 434 } else { 435 bcopy(dst, (void *)osp, sc->secsize); 436 osp = 0; 437 } 438 } 439 } else { 440 error = EOPNOTSUPP; 441 } 442 if (osp > 255) 443 uma_zfree(sc->uma, (void*)osp); 444 if (error) 445 break; 446 secno++; 447 dst += sc->secsize; 448 } 449 bp->bio_resid = 0; 450 return (error); 451 } 452 453 static int 454 mdstart_preload(struct md_s *sc, struct bio *bp) 455 { 456 457 if (bp->bio_cmd == BIO_DELETE) { 458 } else if (bp->bio_cmd == BIO_READ) { 459 bcopy(sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_data, bp->bio_bcount); 460 } else { 461 bcopy(bp->bio_data, sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_bcount); 462 } 463 bp->bio_resid = 0; 464 return (0); 465 } 466 467 static int 468 mdstart_vnode(struct md_s *sc, struct bio *bp) 469 { 470 int error; 471 struct uio auio; 472 struct iovec aiov; 473 struct mount *mp; 474 475 /* 476 * VNODE I/O 477 * 478 * If an error occurs, we set BIO_ERROR but we do not set 479 * B_INVAL because (for a write anyway), the buffer is 480 * still valid. 481 */ 482 483 bzero(&auio, sizeof(auio)); 484 485 aiov.iov_base = bp->bio_data; 486 aiov.iov_len = bp->bio_bcount; 487 auio.uio_iov = &aiov; 488 auio.uio_iovcnt = 1; 489 auio.uio_offset = (vm_ooffset_t)bp->bio_pblkno * sc->secsize; 490 auio.uio_segflg = UIO_SYSSPACE; 491 if(bp->bio_cmd == BIO_READ) 492 auio.uio_rw = UIO_READ; 493 else 494 auio.uio_rw = UIO_WRITE; 495 auio.uio_resid = bp->bio_bcount; 496 auio.uio_td = curthread; 497 /* 498 * When reading set IO_DIRECT to try to avoid double-caching 499 * the data. When writing IO_DIRECT is not optimal. 500 */ 501 if (bp->bio_cmd == BIO_READ) { 502 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 503 error = VOP_READ(sc->vnode, &auio, IO_DIRECT, sc->cred); 504 } else { 505 (void) vn_start_write(sc->vnode, &mp, V_WAIT); 506 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 507 error = VOP_WRITE(sc->vnode, &auio, 0, sc->cred); 508 vn_finished_write(mp); 509 } 510 VOP_UNLOCK(sc->vnode, 0, curthread); 511 bp->bio_resid = auio.uio_resid; 512 return (error); 513 } 514 515 static void 516 mddone_swap(struct bio *bp) 517 { 518 519 bp->bio_completed = bp->bio_length - bp->bio_resid; 520 g_std_done(bp); 521 } 522 523 static int 524 mdstart_swap(struct md_s *sc, struct bio *bp) 525 { 526 { 527 struct bio *bp2; 528 529 bp2 = g_clone_bio(bp); 530 bp2->bio_done = mddone_swap; 531 bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; 532 bp2->bio_pblkno = bp2->bio_offset / sc->secsize; 533 bp2->bio_bcount = bp2->bio_length; 534 bp = bp2; 535 } 536 537 bp->bio_resid = 0; 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 md_kthread(void *arg) 547 { 548 struct md_s *sc; 549 struct bio *bp; 550 int error, hasgiant; 551 552 sc = arg; 553 curthread->td_base_pri = PRIBIO; 554 555 switch (sc->type) { 556 case MD_SWAP: 557 case MD_VNODE: 558 mtx_lock(&Giant); 559 hasgiant = 1; 560 break; 561 case MD_MALLOC: 562 case MD_PRELOAD: 563 default: 564 hasgiant = 0; 565 break; 566 } 567 568 for (;;) { 569 mtx_lock(&sc->queue_mtx); 570 bp = bioq_first(&sc->bio_queue); 571 if (bp) 572 bioq_remove(&sc->bio_queue, bp); 573 if (!bp) { 574 if (sc->flags & MD_SHUTDOWN) { 575 mtx_unlock(&sc->queue_mtx); 576 sc->procp = NULL; 577 wakeup(&sc->procp); 578 if (!hasgiant) 579 mtx_lock(&Giant); 580 kthread_exit(0); 581 } 582 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 583 continue; 584 } 585 mtx_unlock(&sc->queue_mtx); 586 if (bp->bio_cmd == BIO_GETATTR) { 587 if (sc->fwsectors && sc->fwheads && 588 (g_handleattr_int(bp, "GEOM::fwsectors", 589 sc->fwsectors) || 590 g_handleattr_int(bp, "GEOM::fwheads", 591 sc->fwheads))) 592 error = -1; 593 else 594 error = EOPNOTSUPP; 595 } else { 596 switch (sc->type) { 597 case MD_MALLOC: 598 error = mdstart_malloc(sc, bp); 599 break; 600 case MD_PRELOAD: 601 error = mdstart_preload(sc, bp); 602 break; 603 case MD_VNODE: 604 error = mdstart_vnode(sc, bp); 605 break; 606 case MD_SWAP: 607 error = mdstart_swap(sc, bp); 608 break; 609 default: 610 panic("Impossible md(type)"); 611 break; 612 } 613 } 614 615 if (error != -1) { 616 bp->bio_completed = bp->bio_length; 617 g_io_deliver(bp, error); 618 } 619 } 620 } 621 622 static struct md_s * 623 mdfind(int unit) 624 { 625 struct md_s *sc; 626 627 /* XXX: LOCK(unique unit numbers) */ 628 LIST_FOREACH(sc, &md_softc_list, list) { 629 if (sc->unit == unit) 630 break; 631 } 632 /* XXX: UNLOCK(unique unit numbers) */ 633 return (sc); 634 } 635 636 static struct md_s * 637 mdnew(int unit) 638 { 639 struct md_s *sc; 640 int error, max = -1; 641 642 /* XXX: LOCK(unique unit numbers) */ 643 LIST_FOREACH(sc, &md_softc_list, list) { 644 if (sc->unit == unit) { 645 /* XXX: UNLOCK(unique unit numbers) */ 646 return (NULL); 647 } 648 if (sc->unit > max) 649 max = sc->unit; 650 } 651 if (unit == -1) 652 unit = max + 1; 653 if (unit > 255) 654 return (NULL); 655 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 656 sc->unit = unit; 657 bioq_init(&sc->bio_queue); 658 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 659 sprintf(sc->name, "md%d", unit); 660 error = kthread_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 661 if (error) { 662 free(sc, M_MD); 663 return (NULL); 664 } 665 LIST_INSERT_HEAD(&md_softc_list, sc, list); 666 /* XXX: UNLOCK(unique unit numbers) */ 667 return (sc); 668 } 669 670 static void 671 mdinit(struct md_s *sc) 672 { 673 674 struct g_geom *gp; 675 struct g_provider *pp; 676 677 DROP_GIANT(); 678 g_topology_lock(); 679 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 680 gp->start = g_md_start; 681 gp->access = g_md_access; 682 gp->softc = sc; 683 pp = g_new_providerf(gp, "md%d", sc->unit); 684 pp->mediasize = (off_t)sc->nsect * sc->secsize; 685 pp->sectorsize = sc->secsize; 686 sc->gp = gp; 687 sc->pp = pp; 688 g_error_provider(pp, 0); 689 g_topology_unlock(); 690 PICKUP_GIANT(); 691 } 692 693 /* 694 * XXX: we should check that the range they feed us is mapped. 695 * XXX: we should implement read-only. 696 */ 697 698 static int 699 mdcreate_preload(struct md_ioctl *mdio) 700 { 701 struct md_s *sc; 702 703 if (mdio->md_size == 0) 704 return (EINVAL); 705 if (mdio->md_options & ~(MD_AUTOUNIT)) 706 return (EINVAL); 707 if (mdio->md_options & MD_AUTOUNIT) { 708 sc = mdnew(-1); 709 if (sc == NULL) 710 return (ENOMEM); 711 mdio->md_unit = sc->unit; 712 } else { 713 sc = mdnew(mdio->md_unit); 714 if (sc == NULL) 715 return (EBUSY); 716 } 717 sc->type = MD_PRELOAD; 718 sc->secsize = DEV_BSIZE; 719 sc->nsect = mdio->md_size; 720 sc->flags = mdio->md_options & MD_FORCE; 721 /* Cast to pointer size, then to pointer to avoid warning */ 722 sc->pl_ptr = (u_char *)(uintptr_t)mdio->md_base; 723 sc->pl_len = (mdio->md_size << DEV_BSHIFT); 724 mdinit(sc); 725 return (0); 726 } 727 728 729 static int 730 mdcreate_malloc(struct md_ioctl *mdio) 731 { 732 struct md_s *sc; 733 off_t u; 734 uintptr_t sp; 735 int error; 736 737 error = 0; 738 if (mdio->md_size == 0) 739 return (EINVAL); 740 if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 741 return (EINVAL); 742 if (mdio->md_secsize != 0 && !powerof2(mdio->md_secsize)) 743 return (EINVAL); 744 /* Compression doesn't make sense if we have reserved space */ 745 if (mdio->md_options & MD_RESERVE) 746 mdio->md_options &= ~MD_COMPRESS; 747 if (mdio->md_options & MD_AUTOUNIT) { 748 sc = mdnew(-1); 749 if (sc == NULL) 750 return (ENOMEM); 751 mdio->md_unit = sc->unit; 752 } else { 753 sc = mdnew(mdio->md_unit); 754 if (sc == NULL) 755 return (EBUSY); 756 } 757 sc->type = MD_MALLOC; 758 if (mdio->md_secsize != 0) 759 sc->secsize = mdio->md_secsize; 760 else 761 sc->secsize = DEV_BSIZE; 762 if (mdio->md_fwsectors != 0) 763 sc->fwsectors = mdio->md_fwsectors; 764 if (mdio->md_fwheads != 0) 765 sc->fwheads = mdio->md_fwheads; 766 sc->nsect = mdio->md_size; 767 sc->nsect /= (sc->secsize / DEV_BSIZE); 768 sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE); 769 sc->indir = dimension(sc->nsect); 770 sc->uma = uma_zcreate(sc->name, sc->secsize, 771 NULL, NULL, NULL, NULL, 0x1ff, 0); 772 if (mdio->md_options & MD_RESERVE) { 773 for (u = 0; u < sc->nsect; u++) { 774 sp = (uintptr_t) uma_zalloc(sc->uma, M_NOWAIT | M_ZERO); 775 if (sp != 0) 776 error = s_write(sc->indir, u, sp); 777 else 778 error = ENOMEM; 779 if (error) 780 break; 781 } 782 } 783 if (error) { 784 mddestroy(sc, NULL); 785 return (error); 786 } 787 mdinit(sc); 788 if (!(mdio->md_options & MD_RESERVE)) 789 sc->pp->flags |= G_PF_CANDELETE; 790 return (0); 791 } 792 793 794 static int 795 mdsetcred(struct md_s *sc, struct ucred *cred) 796 { 797 char *tmpbuf; 798 int error = 0; 799 800 /* 801 * Set credits in our softc 802 */ 803 804 if (sc->cred) 805 crfree(sc->cred); 806 sc->cred = crhold(cred); 807 808 /* 809 * Horrible kludge to establish credentials for NFS XXX. 810 */ 811 812 if (sc->vnode) { 813 struct uio auio; 814 struct iovec aiov; 815 816 tmpbuf = malloc(sc->secsize, M_TEMP, M_WAITOK); 817 bzero(&auio, sizeof(auio)); 818 819 aiov.iov_base = tmpbuf; 820 aiov.iov_len = sc->secsize; 821 auio.uio_iov = &aiov; 822 auio.uio_iovcnt = 1; 823 auio.uio_offset = 0; 824 auio.uio_rw = UIO_READ; 825 auio.uio_segflg = UIO_SYSSPACE; 826 auio.uio_resid = aiov.iov_len; 827 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 828 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 829 VOP_UNLOCK(sc->vnode, 0, curthread); 830 free(tmpbuf, M_TEMP); 831 } 832 return (error); 833 } 834 835 static int 836 mdcreate_vnode(struct md_ioctl *mdio, struct thread *td) 837 { 838 struct md_s *sc; 839 struct vattr vattr; 840 struct nameidata nd; 841 int error, flags; 842 843 flags = FREAD|FWRITE; 844 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 845 error = vn_open(&nd, &flags, 0); 846 if (error) { 847 if (error != EACCES && error != EPERM && error != EROFS) 848 return (error); 849 flags &= ~FWRITE; 850 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 851 error = vn_open(&nd, &flags, 0); 852 if (error) 853 return (error); 854 } 855 NDFREE(&nd, NDF_ONLY_PNBUF); 856 if (nd.ni_vp->v_type != VREG || 857 (error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred, td))) { 858 VOP_UNLOCK(nd.ni_vp, 0, td); 859 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 860 return (error ? error : EINVAL); 861 } 862 VOP_UNLOCK(nd.ni_vp, 0, td); 863 864 if (mdio->md_options & MD_AUTOUNIT) { 865 sc = mdnew(-1); 866 mdio->md_unit = sc->unit; 867 } else { 868 sc = mdnew(mdio->md_unit); 869 } 870 if (sc == NULL) { 871 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 872 return (EBUSY); 873 } 874 875 sc->type = MD_VNODE; 876 sc->flags = mdio->md_options & MD_FORCE; 877 if (!(flags & FWRITE)) 878 sc->flags |= MD_READONLY; 879 sc->secsize = DEV_BSIZE; 880 sc->vnode = nd.ni_vp; 881 882 /* 883 * If the size is specified, override the file attributes. 884 */ 885 if (mdio->md_size) 886 sc->nsect = mdio->md_size; 887 else 888 sc->nsect = vattr.va_size / sc->secsize; /* XXX: round up ? */ 889 if (sc->nsect == 0) { 890 mddestroy(sc, td); 891 return (EINVAL); 892 } 893 error = mdsetcred(sc, td->td_ucred); 894 if (error) { 895 mddestroy(sc, td); 896 return (error); 897 } 898 mdinit(sc); 899 return (0); 900 } 901 902 static void 903 md_zapit(void *p, int cancel) 904 { 905 if (cancel) 906 return; 907 g_wither_geom(p, ENXIO); 908 } 909 910 static int 911 mddestroy(struct md_s *sc, struct thread *td) 912 { 913 914 GIANT_REQUIRED; 915 916 mtx_destroy(&sc->queue_mtx); 917 if (sc->gp) { 918 sc->gp->softc = NULL; 919 g_waitfor_event(md_zapit, sc->gp, M_WAITOK, sc->gp, NULL); 920 sc->gp = NULL; 921 sc->pp = NULL; 922 } 923 sc->flags |= MD_SHUTDOWN; 924 wakeup(sc); 925 while (sc->procp != NULL) 926 tsleep(&sc->procp, PRIBIO, "mddestroy", hz / 10); 927 if (sc->vnode != NULL) 928 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 929 FREAD : (FREAD|FWRITE), sc->cred, td); 930 if (sc->cred != NULL) 931 crfree(sc->cred); 932 if (sc->object != NULL) { 933 vm_object_deallocate(sc->object); 934 } 935 if (sc->indir) 936 destroy_indir(sc, sc->indir); 937 if (sc->uma) 938 uma_zdestroy(sc->uma); 939 940 /* XXX: LOCK(unique unit numbers) */ 941 LIST_REMOVE(sc, list); 942 /* XXX: UNLOCK(unique unit numbers) */ 943 free(sc, M_MD); 944 return (0); 945 } 946 947 static int 948 mdcreate_swap(struct md_ioctl *mdio, struct thread *td) 949 { 950 int error; 951 struct md_s *sc; 952 953 GIANT_REQUIRED; 954 955 if (mdio->md_options & MD_AUTOUNIT) { 956 sc = mdnew(-1); 957 mdio->md_unit = sc->unit; 958 } else { 959 sc = mdnew(mdio->md_unit); 960 } 961 if (sc == NULL) 962 return (EBUSY); 963 964 sc->type = MD_SWAP; 965 966 /* 967 * Range check. Disallow negative sizes or any size less then the 968 * size of a page. Then round to a page. 969 */ 970 971 if (mdio->md_size == 0) { 972 mddestroy(sc, td); 973 return (EDOM); 974 } 975 976 /* 977 * Allocate an OBJT_SWAP object. 978 * 979 * sc_secsize is PAGE_SIZE'd 980 * 981 * mdio->size is in DEV_BSIZE'd chunks. 982 * Note the truncation. 983 */ 984 985 sc->secsize = PAGE_SIZE; 986 sc->nsect = mdio->md_size / (PAGE_SIZE / DEV_BSIZE); 987 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, sc->secsize * (vm_offset_t)sc->nsect, VM_PROT_DEFAULT, 0); 988 sc->flags = mdio->md_options & MD_FORCE; 989 if (mdio->md_options & MD_RESERVE) { 990 if (swap_pager_reserve(sc->object, 0, sc->nsect) < 0) { 991 vm_object_deallocate(sc->object); 992 sc->object = NULL; 993 mddestroy(sc, td); 994 return (EDOM); 995 } 996 } 997 error = mdsetcred(sc, td->td_ucred); 998 if (error) { 999 mddestroy(sc, td); 1000 return (error); 1001 } 1002 mdinit(sc); 1003 if (!(mdio->md_options & MD_RESERVE)) 1004 sc->pp->flags |= G_PF_CANDELETE; 1005 return (0); 1006 } 1007 1008 static int 1009 mddetach(int unit, struct thread *td) 1010 { 1011 struct md_s *sc; 1012 1013 sc = mdfind(unit); 1014 if (sc == NULL) 1015 return (ENOENT); 1016 if (sc->opencount != 0 && !(sc->flags & MD_FORCE)) 1017 return (EBUSY); 1018 switch(sc->type) { 1019 case MD_VNODE: 1020 case MD_SWAP: 1021 case MD_MALLOC: 1022 case MD_PRELOAD: 1023 return (mddestroy(sc, td)); 1024 default: 1025 return (EOPNOTSUPP); 1026 } 1027 } 1028 1029 static int 1030 mdctlioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 1031 { 1032 struct md_ioctl *mdio; 1033 struct md_s *sc; 1034 int i; 1035 1036 if (md_debug) 1037 printf("mdctlioctl(%s %lx %p %x %p)\n", 1038 devtoname(dev), cmd, addr, flags, td); 1039 1040 /* 1041 * We assert the version number in the individual ioctl 1042 * handlers instead of out here because (a) it is possible we 1043 * may add another ioctl in the future which doesn't read an 1044 * mdio, and (b) the correct return value for an unknown ioctl 1045 * is ENOIOCTL, not EINVAL. 1046 */ 1047 mdio = (struct md_ioctl *)addr; 1048 switch (cmd) { 1049 case MDIOCATTACH: 1050 if (mdio->md_version != MDIOVERSION) 1051 return (EINVAL); 1052 switch (mdio->md_type) { 1053 case MD_MALLOC: 1054 return (mdcreate_malloc(mdio)); 1055 case MD_PRELOAD: 1056 return (mdcreate_preload(mdio)); 1057 case MD_VNODE: 1058 return (mdcreate_vnode(mdio, td)); 1059 case MD_SWAP: 1060 return (mdcreate_swap(mdio, td)); 1061 default: 1062 return (EINVAL); 1063 } 1064 case MDIOCDETACH: 1065 if (mdio->md_version != MDIOVERSION) 1066 return (EINVAL); 1067 if (mdio->md_file != NULL || mdio->md_size != 0 || 1068 mdio->md_options != 0) 1069 return (EINVAL); 1070 return (mddetach(mdio->md_unit, td)); 1071 case MDIOCQUERY: 1072 if (mdio->md_version != MDIOVERSION) 1073 return (EINVAL); 1074 sc = mdfind(mdio->md_unit); 1075 if (sc == NULL) 1076 return (ENOENT); 1077 mdio->md_type = sc->type; 1078 mdio->md_options = sc->flags; 1079 switch (sc->type) { 1080 case MD_MALLOC: 1081 mdio->md_size = sc->nsect; 1082 break; 1083 case MD_PRELOAD: 1084 mdio->md_size = sc->nsect; 1085 mdio->md_base = (uint64_t)(intptr_t)sc->pl_ptr; 1086 break; 1087 case MD_SWAP: 1088 mdio->md_size = sc->nsect * (PAGE_SIZE / DEV_BSIZE); 1089 break; 1090 case MD_VNODE: 1091 mdio->md_size = sc->nsect; 1092 /* XXX fill this in */ 1093 mdio->md_file = NULL; 1094 break; 1095 } 1096 return (0); 1097 case MDIOCLIST: 1098 i = 1; 1099 LIST_FOREACH(sc, &md_softc_list, list) { 1100 if (i == MDNPAD - 1) 1101 mdio->md_pad[i] = -1; 1102 else 1103 mdio->md_pad[i++] = sc->unit; 1104 } 1105 mdio->md_pad[0] = i - 1; 1106 return (0); 1107 default: 1108 return (ENOIOCTL); 1109 }; 1110 return (ENOIOCTL); 1111 } 1112 1113 static void 1114 md_preloaded(u_char *image, unsigned length) 1115 { 1116 struct md_s *sc; 1117 1118 sc = mdnew(-1); 1119 if (sc == NULL) 1120 return; 1121 sc->type = MD_PRELOAD; 1122 sc->secsize = DEV_BSIZE; 1123 sc->nsect = length / DEV_BSIZE; 1124 sc->pl_ptr = image; 1125 sc->pl_len = length; 1126 if (sc->unit == 0) 1127 mdrootready = 1; 1128 mdinit(sc); 1129 } 1130 1131 static void 1132 md_drvinit(void *unused) 1133 { 1134 1135 caddr_t mod; 1136 caddr_t c; 1137 u_char *ptr, *name, *type; 1138 unsigned len; 1139 1140 #ifdef MD_ROOT_SIZE 1141 md_preloaded(mfs_root, MD_ROOT_SIZE*1024); 1142 #endif 1143 mod = NULL; 1144 while ((mod = preload_search_next_name(mod)) != NULL) { 1145 name = (char *)preload_search_info(mod, MODINFO_NAME); 1146 type = (char *)preload_search_info(mod, MODINFO_TYPE); 1147 if (name == NULL) 1148 continue; 1149 if (type == NULL) 1150 continue; 1151 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 1152 continue; 1153 c = preload_search_info(mod, MODINFO_ADDR); 1154 ptr = *(u_char **)c; 1155 c = preload_search_info(mod, MODINFO_SIZE); 1156 len = *(size_t *)c; 1157 printf("%s%d: Preloaded image <%s> %d bytes at %p\n", 1158 MD_NAME, mdunits, name, len, ptr); 1159 md_preloaded(ptr, len); 1160 } 1161 status_dev = make_dev(&mdctl_cdevsw, 0xffff00ff, UID_ROOT, GID_WHEEL, 1162 0600, MDCTL_NAME); 1163 } 1164 1165 static int 1166 md_modevent(module_t mod, int type, void *data) 1167 { 1168 int error; 1169 struct md_s *sc; 1170 1171 switch (type) { 1172 case MOD_LOAD: 1173 md_drvinit(NULL); 1174 break; 1175 case MOD_UNLOAD: 1176 LIST_FOREACH(sc, &md_softc_list, list) { 1177 error = mddetach(sc->unit, curthread); 1178 if (error != 0) 1179 return (error); 1180 } 1181 if (status_dev) 1182 destroy_dev(status_dev); 1183 status_dev = 0; 1184 break; 1185 default: 1186 break; 1187 } 1188 return (0); 1189 } 1190 1191 static moduledata_t md_mod = { 1192 MD_NAME, 1193 md_modevent, 1194 NULL 1195 }; 1196 DECLARE_MODULE(md, md_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE+CDEV_MAJOR); 1197 MODULE_VERSION(md, MD_MODVER); 1198 1199 1200 #ifdef MD_ROOT 1201 static void 1202 md_takeroot(void *junk) 1203 { 1204 if (mdrootready) 1205 rootdevnames[0] = "ufs:/dev/md0"; 1206 } 1207 1208 SYSINIT(md_root, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, md_takeroot, NULL); 1209 #endif /* MD_ROOT */ 1210