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 G_CLASS_INITIALIZER 345 }; 346 347 static int 348 g_md_access(struct g_provider *pp, int r, int w, int e) 349 { 350 struct md_s *sc; 351 352 sc = pp->geom->softc; 353 r += pp->acr; 354 w += pp->acw; 355 e += pp->ace; 356 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 357 sc->opencount = 1; 358 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 359 sc->opencount = 0; 360 } 361 return (0); 362 } 363 364 static void 365 g_md_start(struct bio *bp) 366 { 367 struct md_s *sc; 368 369 sc = bp->bio_to->geom->softc; 370 371 bp->bio_blkno = bp->bio_offset >> DEV_BSHIFT; 372 bp->bio_pblkno = bp->bio_offset / sc->secsize; 373 bp->bio_bcount = bp->bio_length; 374 mtx_lock(&sc->queue_mtx); 375 bioq_disksort(&sc->bio_queue, bp); 376 mtx_unlock(&sc->queue_mtx); 377 378 wakeup(sc); 379 } 380 381 DECLARE_GEOM_CLASS(g_md_class, g_md); 382 383 384 static int 385 mdstart_malloc(struct md_s *sc, struct bio *bp) 386 { 387 int i, error; 388 u_char *dst; 389 unsigned secno, nsec, uc; 390 uintptr_t sp, osp; 391 392 nsec = bp->bio_bcount / sc->secsize; 393 secno = bp->bio_pblkno; 394 dst = bp->bio_data; 395 error = 0; 396 while (nsec--) { 397 osp = s_read(sc->indir, secno); 398 if (bp->bio_cmd == BIO_DELETE) { 399 if (osp != 0) 400 error = s_write(sc->indir, secno, 0); 401 } else if (bp->bio_cmd == BIO_READ) { 402 if (osp == 0) 403 bzero(dst, sc->secsize); 404 else if (osp <= 255) 405 for (i = 0; i < sc->secsize; i++) 406 dst[i] = osp; 407 else 408 bcopy((void *)osp, dst, sc->secsize); 409 osp = 0; 410 } else if (bp->bio_cmd == BIO_WRITE) { 411 if (sc->flags & MD_COMPRESS) { 412 uc = dst[0]; 413 for (i = 1; i < sc->secsize; i++) 414 if (dst[i] != uc) 415 break; 416 } else { 417 i = 0; 418 uc = 0; 419 } 420 if (i == sc->secsize) { 421 if (osp != uc) 422 error = s_write(sc->indir, secno, uc); 423 } else { 424 if (osp <= 255) { 425 sp = (uintptr_t) uma_zalloc( 426 sc->uma, M_NOWAIT); 427 if (sp == 0) { 428 error = ENOSPC; 429 break; 430 } 431 bcopy(dst, (void *)sp, sc->secsize); 432 error = s_write(sc->indir, secno, sp); 433 } else { 434 bcopy(dst, (void *)osp, sc->secsize); 435 osp = 0; 436 } 437 } 438 } else { 439 error = EOPNOTSUPP; 440 } 441 if (osp > 255) 442 uma_zfree(sc->uma, (void*)osp); 443 if (error) 444 break; 445 secno++; 446 dst += sc->secsize; 447 } 448 bp->bio_resid = 0; 449 return (error); 450 } 451 452 static int 453 mdstart_preload(struct md_s *sc, struct bio *bp) 454 { 455 456 if (bp->bio_cmd == BIO_DELETE) { 457 } else if (bp->bio_cmd == BIO_READ) { 458 bcopy(sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_data, bp->bio_bcount); 459 } else { 460 bcopy(bp->bio_data, sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_bcount); 461 } 462 bp->bio_resid = 0; 463 return (0); 464 } 465 466 static int 467 mdstart_vnode(struct md_s *sc, struct bio *bp) 468 { 469 int error; 470 struct uio auio; 471 struct iovec aiov; 472 struct mount *mp; 473 474 /* 475 * VNODE I/O 476 * 477 * If an error occurs, we set BIO_ERROR but we do not set 478 * B_INVAL because (for a write anyway), the buffer is 479 * still valid. 480 */ 481 482 bzero(&auio, sizeof(auio)); 483 484 aiov.iov_base = bp->bio_data; 485 aiov.iov_len = bp->bio_bcount; 486 auio.uio_iov = &aiov; 487 auio.uio_iovcnt = 1; 488 auio.uio_offset = (vm_ooffset_t)bp->bio_pblkno * sc->secsize; 489 auio.uio_segflg = UIO_SYSSPACE; 490 if(bp->bio_cmd == BIO_READ) 491 auio.uio_rw = UIO_READ; 492 else 493 auio.uio_rw = UIO_WRITE; 494 auio.uio_resid = bp->bio_bcount; 495 auio.uio_td = curthread; 496 /* 497 * When reading set IO_DIRECT to try to avoid double-caching 498 * the data. When writing IO_DIRECT is not optimal, but we 499 * must set IO_NOWDRAIN to avoid a wdrain deadlock. 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, IO_NOWDRAIN, 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 int 903 mddestroy(struct md_s *sc, struct thread *td) 904 { 905 906 GIANT_REQUIRED; 907 908 mtx_destroy(&sc->queue_mtx); 909 if (sc->gp) { 910 sc->gp->flags |= G_GEOM_WITHER; 911 sc->gp->softc = NULL; 912 } 913 if (sc->pp) 914 g_orphan_provider(sc->pp, ENXIO); 915 sc->flags |= MD_SHUTDOWN; 916 wakeup(sc); 917 while (sc->procp != NULL) 918 tsleep(&sc->procp, PRIBIO, "mddestroy", hz / 10); 919 if (sc->vnode != NULL) 920 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 921 FREAD : (FREAD|FWRITE), sc->cred, td); 922 if (sc->cred != NULL) 923 crfree(sc->cred); 924 if (sc->object != NULL) { 925 vm_pager_deallocate(sc->object); 926 } 927 if (sc->indir) 928 destroy_indir(sc, sc->indir); 929 if (sc->uma) 930 uma_zdestroy(sc->uma); 931 932 /* XXX: LOCK(unique unit numbers) */ 933 LIST_REMOVE(sc, list); 934 /* XXX: UNLOCK(unique unit numbers) */ 935 free(sc, M_MD); 936 return (0); 937 } 938 939 static int 940 mdcreate_swap(struct md_ioctl *mdio, struct thread *td) 941 { 942 int error; 943 struct md_s *sc; 944 945 GIANT_REQUIRED; 946 947 if (mdio->md_options & MD_AUTOUNIT) { 948 sc = mdnew(-1); 949 mdio->md_unit = sc->unit; 950 } else { 951 sc = mdnew(mdio->md_unit); 952 } 953 if (sc == NULL) 954 return (EBUSY); 955 956 sc->type = MD_SWAP; 957 958 /* 959 * Range check. Disallow negative sizes or any size less then the 960 * size of a page. Then round to a page. 961 */ 962 963 if (mdio->md_size == 0) { 964 mddestroy(sc, td); 965 return (EDOM); 966 } 967 968 /* 969 * Allocate an OBJT_SWAP object. 970 * 971 * sc_secsize is PAGE_SIZE'd 972 * 973 * mdio->size is in DEV_BSIZE'd chunks. 974 * Note the truncation. 975 */ 976 977 sc->secsize = PAGE_SIZE; 978 sc->nsect = mdio->md_size / (PAGE_SIZE / DEV_BSIZE); 979 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, sc->secsize * (vm_offset_t)sc->nsect, VM_PROT_DEFAULT, 0); 980 sc->flags = mdio->md_options & MD_FORCE; 981 if (mdio->md_options & MD_RESERVE) { 982 if (swap_pager_reserve(sc->object, 0, sc->nsect) < 0) { 983 vm_pager_deallocate(sc->object); 984 sc->object = NULL; 985 mddestroy(sc, td); 986 return (EDOM); 987 } 988 } 989 error = mdsetcred(sc, td->td_ucred); 990 if (error) { 991 mddestroy(sc, td); 992 return (error); 993 } 994 mdinit(sc); 995 if (!(mdio->md_options & MD_RESERVE)) 996 sc->pp->flags |= G_PF_CANDELETE; 997 return (0); 998 } 999 1000 static int 1001 mddetach(int unit, struct thread *td) 1002 { 1003 struct md_s *sc; 1004 1005 sc = mdfind(unit); 1006 if (sc == NULL) 1007 return (ENOENT); 1008 if (sc->opencount != 0 && !(sc->flags & MD_FORCE)) 1009 return (EBUSY); 1010 switch(sc->type) { 1011 case MD_VNODE: 1012 case MD_SWAP: 1013 case MD_MALLOC: 1014 case MD_PRELOAD: 1015 return (mddestroy(sc, td)); 1016 default: 1017 return (EOPNOTSUPP); 1018 } 1019 } 1020 1021 static int 1022 mdctlioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 1023 { 1024 struct md_ioctl *mdio; 1025 struct md_s *sc; 1026 int i; 1027 1028 if (md_debug) 1029 printf("mdctlioctl(%s %lx %p %x %p)\n", 1030 devtoname(dev), cmd, addr, flags, td); 1031 1032 /* 1033 * We assert the version number in the individual ioctl 1034 * handlers instead of out here because (a) it is possible we 1035 * may add another ioctl in the future which doesn't read an 1036 * mdio, and (b) the correct return value for an unknown ioctl 1037 * is ENOIOCTL, not EINVAL. 1038 */ 1039 mdio = (struct md_ioctl *)addr; 1040 switch (cmd) { 1041 case MDIOCATTACH: 1042 if (mdio->md_version != MDIOVERSION) 1043 return (EINVAL); 1044 switch (mdio->md_type) { 1045 case MD_MALLOC: 1046 return (mdcreate_malloc(mdio)); 1047 case MD_PRELOAD: 1048 return (mdcreate_preload(mdio)); 1049 case MD_VNODE: 1050 return (mdcreate_vnode(mdio, td)); 1051 case MD_SWAP: 1052 return (mdcreate_swap(mdio, td)); 1053 default: 1054 return (EINVAL); 1055 } 1056 case MDIOCDETACH: 1057 if (mdio->md_version != MDIOVERSION) 1058 return (EINVAL); 1059 if (mdio->md_file != NULL || mdio->md_size != 0 || 1060 mdio->md_options != 0) 1061 return (EINVAL); 1062 return (mddetach(mdio->md_unit, td)); 1063 case MDIOCQUERY: 1064 if (mdio->md_version != MDIOVERSION) 1065 return (EINVAL); 1066 sc = mdfind(mdio->md_unit); 1067 if (sc == NULL) 1068 return (ENOENT); 1069 mdio->md_type = sc->type; 1070 mdio->md_options = sc->flags; 1071 switch (sc->type) { 1072 case MD_MALLOC: 1073 mdio->md_size = sc->nsect; 1074 break; 1075 case MD_PRELOAD: 1076 mdio->md_size = sc->nsect; 1077 mdio->md_base = (uint64_t)(intptr_t)sc->pl_ptr; 1078 break; 1079 case MD_SWAP: 1080 mdio->md_size = sc->nsect * (PAGE_SIZE / DEV_BSIZE); 1081 break; 1082 case MD_VNODE: 1083 mdio->md_size = sc->nsect; 1084 /* XXX fill this in */ 1085 mdio->md_file = NULL; 1086 break; 1087 } 1088 return (0); 1089 case MDIOCLIST: 1090 i = 1; 1091 LIST_FOREACH(sc, &md_softc_list, list) { 1092 if (i == MDNPAD - 1) 1093 mdio->md_pad[i] = -1; 1094 else 1095 mdio->md_pad[i++] = sc->unit; 1096 } 1097 mdio->md_pad[0] = i - 1; 1098 return (0); 1099 default: 1100 return (ENOIOCTL); 1101 }; 1102 return (ENOIOCTL); 1103 } 1104 1105 static void 1106 md_preloaded(u_char *image, unsigned length) 1107 { 1108 struct md_s *sc; 1109 1110 sc = mdnew(-1); 1111 if (sc == NULL) 1112 return; 1113 sc->type = MD_PRELOAD; 1114 sc->secsize = DEV_BSIZE; 1115 sc->nsect = length / DEV_BSIZE; 1116 sc->pl_ptr = image; 1117 sc->pl_len = length; 1118 if (sc->unit == 0) 1119 mdrootready = 1; 1120 mdinit(sc); 1121 } 1122 1123 static void 1124 md_drvinit(void *unused) 1125 { 1126 1127 caddr_t mod; 1128 caddr_t c; 1129 u_char *ptr, *name, *type; 1130 unsigned len; 1131 1132 #ifdef MD_ROOT_SIZE 1133 md_preloaded(mfs_root, MD_ROOT_SIZE*1024); 1134 #endif 1135 mod = NULL; 1136 while ((mod = preload_search_next_name(mod)) != NULL) { 1137 name = (char *)preload_search_info(mod, MODINFO_NAME); 1138 type = (char *)preload_search_info(mod, MODINFO_TYPE); 1139 if (name == NULL) 1140 continue; 1141 if (type == NULL) 1142 continue; 1143 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 1144 continue; 1145 c = preload_search_info(mod, MODINFO_ADDR); 1146 ptr = *(u_char **)c; 1147 c = preload_search_info(mod, MODINFO_SIZE); 1148 len = *(size_t *)c; 1149 printf("%s%d: Preloaded image <%s> %d bytes at %p\n", 1150 MD_NAME, mdunits, name, len, ptr); 1151 md_preloaded(ptr, len); 1152 } 1153 status_dev = make_dev(&mdctl_cdevsw, 0xffff00ff, UID_ROOT, GID_WHEEL, 1154 0600, MDCTL_NAME); 1155 } 1156 1157 static int 1158 md_modevent(module_t mod, int type, void *data) 1159 { 1160 int error; 1161 struct md_s *sc; 1162 1163 switch (type) { 1164 case MOD_LOAD: 1165 md_drvinit(NULL); 1166 break; 1167 case MOD_UNLOAD: 1168 LIST_FOREACH(sc, &md_softc_list, list) { 1169 error = mddetach(sc->unit, curthread); 1170 if (error != 0) 1171 return (error); 1172 } 1173 if (status_dev) 1174 destroy_dev(status_dev); 1175 status_dev = 0; 1176 break; 1177 default: 1178 break; 1179 } 1180 return (0); 1181 } 1182 1183 static moduledata_t md_mod = { 1184 MD_NAME, 1185 md_modevent, 1186 NULL 1187 }; 1188 DECLARE_MODULE(md, md_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE+CDEV_MAJOR); 1189 MODULE_VERSION(md, MD_MODVER); 1190 1191 1192 #ifdef MD_ROOT 1193 static void 1194 md_takeroot(void *junk) 1195 { 1196 if (mdrootready) 1197 rootdevnames[0] = "ufs:/dev/md0"; 1198 } 1199 1200 SYSINIT(md_root, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, md_takeroot, NULL); 1201 #endif /* MD_ROOT */ 1202