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 flags; 151 char name[20]; 152 struct proc *procp; 153 struct g_geom *gp; 154 struct g_provider *pp; 155 156 /* MD_MALLOC related fields */ 157 struct indir *indir; 158 uma_zone_t uma; 159 160 /* MD_PRELOAD related fields */ 161 u_char *pl_ptr; 162 unsigned pl_len; 163 164 /* MD_VNODE related fields */ 165 struct vnode *vnode; 166 struct ucred *cred; 167 168 /* MD_SWAP related fields */ 169 vm_object_t object; 170 }; 171 172 static int mddestroy(struct md_s *sc, struct thread *td); 173 174 static struct indir * 175 new_indir(uint shift) 176 { 177 struct indir *ip; 178 179 ip = malloc(sizeof *ip, M_MD, M_NOWAIT | M_ZERO); 180 if (ip == NULL) 181 return (NULL); 182 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 183 M_MDSECT, M_NOWAIT | M_ZERO); 184 if (ip->array == NULL) { 185 free(ip, M_MD); 186 return (NULL); 187 } 188 ip->total = NINDIR; 189 ip->shift = shift; 190 return (ip); 191 } 192 193 static void 194 del_indir(struct indir *ip) 195 { 196 197 free(ip->array, M_MDSECT); 198 free(ip, M_MD); 199 } 200 201 static void 202 destroy_indir(struct md_s *sc, struct indir *ip) 203 { 204 int i; 205 206 for (i = 0; i < NINDIR; i++) { 207 if (!ip->array[i]) 208 continue; 209 if (ip->shift) 210 destroy_indir(sc, (struct indir*)(ip->array[i])); 211 else if (ip->array[i] > 255) 212 uma_zfree(sc->uma, (void *)(ip->array[i])); 213 } 214 del_indir(ip); 215 } 216 217 /* 218 * This function does the math and alloctes the top level "indir" structure 219 * for a device of "size" sectors. 220 */ 221 222 static struct indir * 223 dimension(off_t size) 224 { 225 off_t rcnt; 226 struct indir *ip; 227 int i, layer; 228 229 rcnt = size; 230 layer = 0; 231 while (rcnt > NINDIR) { 232 rcnt /= NINDIR; 233 layer++; 234 } 235 /* figure out log2(NINDIR) */ 236 for (i = NINDIR, nshift = -1; i; nshift++) 237 i >>= 1; 238 239 /* 240 * XXX: the top layer is probably not fully populated, so we allocate 241 * too much space for ip->array in here. 242 */ 243 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO); 244 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 245 M_MDSECT, M_WAITOK | M_ZERO); 246 ip->total = NINDIR; 247 ip->shift = layer * nshift; 248 return (ip); 249 } 250 251 /* 252 * Read a given sector 253 */ 254 255 static uintptr_t 256 s_read(struct indir *ip, off_t offset) 257 { 258 struct indir *cip; 259 int idx; 260 uintptr_t up; 261 262 if (md_debug > 1) 263 printf("s_read(%jd)\n", (intmax_t)offset); 264 up = 0; 265 for (cip = ip; cip != NULL;) { 266 if (cip->shift) { 267 idx = (offset >> cip->shift) & NMASK; 268 up = cip->array[idx]; 269 cip = (struct indir *)up; 270 continue; 271 } 272 idx = offset & NMASK; 273 return (cip->array[idx]); 274 } 275 return (0); 276 } 277 278 /* 279 * Write a given sector, prune the tree if the value is 0 280 */ 281 282 static int 283 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 284 { 285 struct indir *cip, *lip[10]; 286 int idx, li; 287 uintptr_t up; 288 289 if (md_debug > 1) 290 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 291 up = 0; 292 li = 0; 293 cip = ip; 294 for (;;) { 295 lip[li++] = cip; 296 if (cip->shift) { 297 idx = (offset >> cip->shift) & NMASK; 298 up = cip->array[idx]; 299 if (up != 0) { 300 cip = (struct indir *)up; 301 continue; 302 } 303 /* Allocate branch */ 304 cip->array[idx] = 305 (uintptr_t)new_indir(cip->shift - nshift); 306 if (cip->array[idx] == 0) 307 return (ENOSPC); 308 cip->used++; 309 up = cip->array[idx]; 310 cip = (struct indir *)up; 311 continue; 312 } 313 /* leafnode */ 314 idx = offset & NMASK; 315 up = cip->array[idx]; 316 if (up != 0) 317 cip->used--; 318 cip->array[idx] = ptr; 319 if (ptr != 0) 320 cip->used++; 321 break; 322 } 323 if (cip->used != 0 || li == 1) 324 return (0); 325 li--; 326 while (cip->used == 0 && cip != ip) { 327 li--; 328 idx = (offset >> lip[li]->shift) & NMASK; 329 up = lip[li]->array[idx]; 330 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 331 del_indir(cip); 332 lip[li]->array[idx] = 0; 333 lip[li]->used--; 334 cip = lip[li]; 335 } 336 return (0); 337 } 338 339 340 struct g_class g_md_class = { 341 .name = "MD", 342 G_CLASS_INITIALIZER 343 }; 344 345 static int 346 g_md_access(struct g_provider *pp, int r, int w, int e) 347 { 348 struct md_s *sc; 349 350 sc = pp->geom->softc; 351 r += pp->acr; 352 w += pp->acw; 353 e += pp->ace; 354 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 355 sc->opencount = 1; 356 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 357 sc->opencount = 0; 358 } 359 return (0); 360 } 361 362 static void 363 g_md_start(struct bio *bp) 364 { 365 struct md_s *sc; 366 367 sc = bp->bio_to->geom->softc; 368 369 switch(bp->bio_cmd) { 370 case BIO_GETATTR: 371 g_io_deliver(bp, EOPNOTSUPP); 372 return; 373 } 374 bp->bio_blkno = bp->bio_offset >> DEV_BSHIFT; 375 bp->bio_pblkno = bp->bio_offset / sc->secsize; 376 bp->bio_bcount = bp->bio_length; 377 mtx_lock(&sc->queue_mtx); 378 bioq_disksort(&sc->bio_queue, bp); 379 mtx_unlock(&sc->queue_mtx); 380 381 wakeup(sc); 382 } 383 384 DECLARE_GEOM_CLASS(g_md_class, g_md); 385 386 387 static int 388 mdstart_malloc(struct md_s *sc, struct bio *bp) 389 { 390 int i, error; 391 u_char *dst; 392 unsigned secno, nsec, uc; 393 uintptr_t sp, osp; 394 395 nsec = bp->bio_bcount / sc->secsize; 396 secno = bp->bio_pblkno; 397 dst = bp->bio_data; 398 error = 0; 399 while (nsec--) { 400 osp = s_read(sc->indir, secno); 401 if (bp->bio_cmd == BIO_DELETE) { 402 if (osp != 0) 403 error = s_write(sc->indir, secno, 0); 404 } else if (bp->bio_cmd == BIO_READ) { 405 if (osp == 0) 406 bzero(dst, sc->secsize); 407 else if (osp <= 255) 408 for (i = 0; i < sc->secsize; i++) 409 dst[i] = osp; 410 else 411 bcopy((void *)osp, dst, sc->secsize); 412 osp = 0; 413 } else if (bp->bio_cmd == BIO_WRITE) { 414 if (sc->flags & MD_COMPRESS) { 415 uc = dst[0]; 416 for (i = 1; i < sc->secsize; i++) 417 if (dst[i] != uc) 418 break; 419 } else { 420 i = 0; 421 uc = 0; 422 } 423 if (i == sc->secsize) { 424 if (osp != uc) 425 error = s_write(sc->indir, secno, uc); 426 } else { 427 if (osp <= 255) { 428 sp = (uintptr_t) uma_zalloc( 429 sc->uma, M_NOWAIT); 430 if (sp == 0) { 431 error = ENOSPC; 432 break; 433 } 434 bcopy(dst, (void *)sp, sc->secsize); 435 error = s_write(sc->indir, secno, sp); 436 } else { 437 bcopy(dst, (void *)osp, sc->secsize); 438 osp = 0; 439 } 440 } 441 } else { 442 error = EOPNOTSUPP; 443 } 444 if (osp > 255) 445 uma_zfree(sc->uma, (void*)osp); 446 if (error) 447 break; 448 secno++; 449 dst += sc->secsize; 450 } 451 bp->bio_resid = 0; 452 return (error); 453 } 454 455 static int 456 mdstart_preload(struct md_s *sc, struct bio *bp) 457 { 458 459 if (bp->bio_cmd == BIO_DELETE) { 460 } else if (bp->bio_cmd == BIO_READ) { 461 bcopy(sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_data, bp->bio_bcount); 462 } else { 463 bcopy(bp->bio_data, sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_bcount); 464 } 465 bp->bio_resid = 0; 466 return (0); 467 } 468 469 static int 470 mdstart_vnode(struct md_s *sc, struct bio *bp) 471 { 472 int error; 473 struct uio auio; 474 struct iovec aiov; 475 struct mount *mp; 476 477 /* 478 * VNODE I/O 479 * 480 * If an error occurs, we set BIO_ERROR but we do not set 481 * B_INVAL because (for a write anyway), the buffer is 482 * still valid. 483 */ 484 485 bzero(&auio, sizeof(auio)); 486 487 aiov.iov_base = bp->bio_data; 488 aiov.iov_len = bp->bio_bcount; 489 auio.uio_iov = &aiov; 490 auio.uio_iovcnt = 1; 491 auio.uio_offset = (vm_ooffset_t)bp->bio_pblkno * sc->secsize; 492 auio.uio_segflg = UIO_SYSSPACE; 493 if(bp->bio_cmd == BIO_READ) 494 auio.uio_rw = UIO_READ; 495 else 496 auio.uio_rw = UIO_WRITE; 497 auio.uio_resid = bp->bio_bcount; 498 auio.uio_td = curthread; 499 /* 500 * When reading set IO_DIRECT to try to avoid double-caching 501 * the data. When writing IO_DIRECT is not optimal, but we 502 * must set IO_NOWDRAIN to avoid a wdrain deadlock. 503 */ 504 if (bp->bio_cmd == BIO_READ) { 505 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 506 error = VOP_READ(sc->vnode, &auio, IO_DIRECT, sc->cred); 507 } else { 508 (void) vn_start_write(sc->vnode, &mp, V_WAIT); 509 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 510 error = VOP_WRITE(sc->vnode, &auio, IO_NOWDRAIN, sc->cred); 511 vn_finished_write(mp); 512 } 513 VOP_UNLOCK(sc->vnode, 0, curthread); 514 bp->bio_resid = auio.uio_resid; 515 return (error); 516 } 517 518 static void 519 mddone_swap(struct bio *bp) 520 { 521 522 bp->bio_completed = bp->bio_length - bp->bio_resid; 523 g_std_done(bp); 524 } 525 526 static int 527 mdstart_swap(struct md_s *sc, struct bio *bp) 528 { 529 { 530 struct bio *bp2; 531 532 bp2 = g_clone_bio(bp); 533 bp2->bio_done = mddone_swap; 534 bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; 535 bp2->bio_pblkno = bp2->bio_offset / sc->secsize; 536 bp2->bio_bcount = bp2->bio_length; 537 bp = bp2; 538 } 539 540 bp->bio_resid = 0; 541 if ((bp->bio_cmd == BIO_DELETE) && (sc->flags & MD_RESERVE)) 542 biodone(bp); 543 else 544 vm_pager_strategy(sc->object, bp); 545 return (-1); 546 } 547 548 static void 549 md_kthread(void *arg) 550 { 551 struct md_s *sc; 552 struct bio *bp; 553 int error, hasgiant; 554 555 sc = arg; 556 curthread->td_base_pri = PRIBIO; 557 558 switch (sc->type) { 559 case MD_SWAP: 560 case MD_VNODE: 561 mtx_lock(&Giant); 562 hasgiant = 1; 563 break; 564 case MD_MALLOC: 565 case MD_PRELOAD: 566 default: 567 hasgiant = 0; 568 break; 569 } 570 571 for (;;) { 572 mtx_lock(&sc->queue_mtx); 573 bp = bioq_first(&sc->bio_queue); 574 if (bp) 575 bioq_remove(&sc->bio_queue, bp); 576 if (!bp) { 577 if (sc->flags & MD_SHUTDOWN) { 578 mtx_unlock(&sc->queue_mtx); 579 sc->procp = NULL; 580 wakeup(&sc->procp); 581 if (!hasgiant) 582 mtx_lock(&Giant); 583 kthread_exit(0); 584 } 585 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 586 continue; 587 } 588 mtx_unlock(&sc->queue_mtx); 589 590 switch (sc->type) { 591 case MD_MALLOC: 592 error = mdstart_malloc(sc, bp); 593 break; 594 case MD_PRELOAD: 595 error = mdstart_preload(sc, bp); 596 break; 597 case MD_VNODE: 598 error = mdstart_vnode(sc, bp); 599 break; 600 case MD_SWAP: 601 error = mdstart_swap(sc, bp); 602 break; 603 default: 604 panic("Impossible md(type)"); 605 break; 606 } 607 608 if (error != -1) { 609 bp->bio_completed = bp->bio_length; 610 g_io_deliver(bp, error); 611 } 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 bioq_init(&sc->bio_queue); 651 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 652 sprintf(sc->name, "md%d", unit); 653 error = kthread_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 654 if (error) { 655 free(sc, M_MD); 656 return (NULL); 657 } 658 LIST_INSERT_HEAD(&md_softc_list, sc, list); 659 /* XXX: UNLOCK(unique unit numbers) */ 660 return (sc); 661 } 662 663 static void 664 mdinit(struct md_s *sc) 665 { 666 667 struct g_geom *gp; 668 struct g_provider *pp; 669 670 DROP_GIANT(); 671 g_topology_lock(); 672 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 673 gp->start = g_md_start; 674 gp->access = g_md_access; 675 gp->softc = sc; 676 pp = g_new_providerf(gp, "md%d", sc->unit); 677 pp->mediasize = (off_t)sc->nsect * sc->secsize; 678 pp->sectorsize = sc->secsize; 679 sc->gp = gp; 680 sc->pp = pp; 681 g_error_provider(pp, 0); 682 g_topology_unlock(); 683 PICKUP_GIANT(); 684 } 685 686 /* 687 * XXX: we should check that the range they feed us is mapped. 688 * XXX: we should implement read-only. 689 */ 690 691 static int 692 mdcreate_preload(struct md_ioctl *mdio) 693 { 694 struct md_s *sc; 695 696 if (mdio->md_size == 0) 697 return (EINVAL); 698 if (mdio->md_options & ~(MD_AUTOUNIT)) 699 return (EINVAL); 700 if (mdio->md_options & MD_AUTOUNIT) { 701 sc = mdnew(-1); 702 if (sc == NULL) 703 return (ENOMEM); 704 mdio->md_unit = sc->unit; 705 } else { 706 sc = mdnew(mdio->md_unit); 707 if (sc == NULL) 708 return (EBUSY); 709 } 710 sc->type = MD_PRELOAD; 711 sc->secsize = DEV_BSIZE; 712 sc->nsect = mdio->md_size; 713 sc->flags = mdio->md_options & MD_FORCE; 714 /* Cast to pointer size, then to pointer to avoid warning */ 715 sc->pl_ptr = (u_char *)(uintptr_t)mdio->md_base; 716 sc->pl_len = (mdio->md_size << DEV_BSHIFT); 717 mdinit(sc); 718 return (0); 719 } 720 721 722 static int 723 mdcreate_malloc(struct md_ioctl *mdio) 724 { 725 struct md_s *sc; 726 off_t u; 727 uintptr_t sp; 728 int error; 729 730 error = 0; 731 if (mdio->md_size == 0) 732 return (EINVAL); 733 if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 734 return (EINVAL); 735 if (mdio->md_secsize != 0 && !powerof2(mdio->md_secsize)) 736 return (EINVAL); 737 /* Compression doesn't make sense if we have reserved space */ 738 if (mdio->md_options & MD_RESERVE) 739 mdio->md_options &= ~MD_COMPRESS; 740 if (mdio->md_options & MD_AUTOUNIT) { 741 sc = mdnew(-1); 742 if (sc == NULL) 743 return (ENOMEM); 744 mdio->md_unit = sc->unit; 745 } else { 746 sc = mdnew(mdio->md_unit); 747 if (sc == NULL) 748 return (EBUSY); 749 } 750 sc->type = MD_MALLOC; 751 if (mdio->md_secsize != 0) 752 sc->secsize = mdio->md_secsize; 753 else 754 sc->secsize = DEV_BSIZE; 755 sc->nsect = mdio->md_size; 756 sc->nsect /= (sc->secsize / DEV_BSIZE); 757 sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE); 758 sc->indir = dimension(sc->nsect); 759 sc->uma = uma_zcreate(sc->name, sc->secsize, 760 NULL, NULL, NULL, NULL, 0x1ff, 0); 761 if (mdio->md_options & MD_RESERVE) { 762 for (u = 0; u < sc->nsect; u++) { 763 sp = (uintptr_t) uma_zalloc(sc->uma, M_NOWAIT | M_ZERO); 764 if (sp != 0) 765 error = s_write(sc->indir, u, sp); 766 else 767 error = ENOMEM; 768 if (error) 769 break; 770 } 771 } 772 if (error) { 773 mddestroy(sc, NULL); 774 return (error); 775 } 776 mdinit(sc); 777 if (!(mdio->md_options & MD_RESERVE)) 778 sc->pp->flags |= G_PF_CANDELETE; 779 return (0); 780 } 781 782 783 static int 784 mdsetcred(struct md_s *sc, struct ucred *cred) 785 { 786 char *tmpbuf; 787 int error = 0; 788 789 /* 790 * Set credits in our softc 791 */ 792 793 if (sc->cred) 794 crfree(sc->cred); 795 sc->cred = crhold(cred); 796 797 /* 798 * Horrible kludge to establish credentials for NFS XXX. 799 */ 800 801 if (sc->vnode) { 802 struct uio auio; 803 struct iovec aiov; 804 805 tmpbuf = malloc(sc->secsize, M_TEMP, M_WAITOK); 806 bzero(&auio, sizeof(auio)); 807 808 aiov.iov_base = tmpbuf; 809 aiov.iov_len = sc->secsize; 810 auio.uio_iov = &aiov; 811 auio.uio_iovcnt = 1; 812 auio.uio_offset = 0; 813 auio.uio_rw = UIO_READ; 814 auio.uio_segflg = UIO_SYSSPACE; 815 auio.uio_resid = aiov.iov_len; 816 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 817 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 818 VOP_UNLOCK(sc->vnode, 0, curthread); 819 free(tmpbuf, M_TEMP); 820 } 821 return (error); 822 } 823 824 static int 825 mdcreate_vnode(struct md_ioctl *mdio, struct thread *td) 826 { 827 struct md_s *sc; 828 struct vattr vattr; 829 struct nameidata nd; 830 int error, flags; 831 832 flags = FREAD|FWRITE; 833 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 834 error = vn_open(&nd, &flags, 0); 835 if (error) { 836 if (error != EACCES && error != EPERM && error != EROFS) 837 return (error); 838 flags &= ~FWRITE; 839 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 840 error = vn_open(&nd, &flags, 0); 841 if (error) 842 return (error); 843 } 844 NDFREE(&nd, NDF_ONLY_PNBUF); 845 if (nd.ni_vp->v_type != VREG || 846 (error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred, td))) { 847 VOP_UNLOCK(nd.ni_vp, 0, td); 848 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 849 return (error ? error : EINVAL); 850 } 851 VOP_UNLOCK(nd.ni_vp, 0, td); 852 853 if (mdio->md_options & MD_AUTOUNIT) { 854 sc = mdnew(-1); 855 mdio->md_unit = sc->unit; 856 } else { 857 sc = mdnew(mdio->md_unit); 858 } 859 if (sc == NULL) { 860 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 861 return (EBUSY); 862 } 863 864 sc->type = MD_VNODE; 865 sc->flags = mdio->md_options & MD_FORCE; 866 if (!(flags & FWRITE)) 867 sc->flags |= MD_READONLY; 868 sc->secsize = DEV_BSIZE; 869 sc->vnode = nd.ni_vp; 870 871 /* 872 * If the size is specified, override the file attributes. 873 */ 874 if (mdio->md_size) 875 sc->nsect = mdio->md_size; 876 else 877 sc->nsect = vattr.va_size / sc->secsize; /* XXX: round up ? */ 878 if (sc->nsect == 0) { 879 mddestroy(sc, td); 880 return (EINVAL); 881 } 882 error = mdsetcred(sc, td->td_ucred); 883 if (error) { 884 mddestroy(sc, td); 885 return (error); 886 } 887 mdinit(sc); 888 return (0); 889 } 890 891 static int 892 mddestroy(struct md_s *sc, struct thread *td) 893 { 894 895 GIANT_REQUIRED; 896 897 mtx_destroy(&sc->queue_mtx); 898 if (sc->gp) { 899 sc->gp->flags |= G_GEOM_WITHER; 900 sc->gp->softc = NULL; 901 } 902 if (sc->pp) 903 g_orphan_provider(sc->pp, ENXIO); 904 sc->flags |= MD_SHUTDOWN; 905 wakeup(sc); 906 while (sc->procp != NULL) 907 tsleep(&sc->procp, PRIBIO, "mddestroy", hz / 10); 908 if (sc->vnode != NULL) 909 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 910 FREAD : (FREAD|FWRITE), sc->cred, td); 911 if (sc->cred != NULL) 912 crfree(sc->cred); 913 if (sc->object != NULL) { 914 vm_pager_deallocate(sc->object); 915 } 916 if (sc->indir) 917 destroy_indir(sc, sc->indir); 918 if (sc->uma) 919 uma_zdestroy(sc->uma); 920 921 /* XXX: LOCK(unique unit numbers) */ 922 LIST_REMOVE(sc, list); 923 /* XXX: UNLOCK(unique unit numbers) */ 924 free(sc, M_MD); 925 return (0); 926 } 927 928 static int 929 mdcreate_swap(struct md_ioctl *mdio, struct thread *td) 930 { 931 int error; 932 struct md_s *sc; 933 934 GIANT_REQUIRED; 935 936 if (mdio->md_options & MD_AUTOUNIT) { 937 sc = mdnew(-1); 938 mdio->md_unit = sc->unit; 939 } else { 940 sc = mdnew(mdio->md_unit); 941 } 942 if (sc == NULL) 943 return (EBUSY); 944 945 sc->type = MD_SWAP; 946 947 /* 948 * Range check. Disallow negative sizes or any size less then the 949 * size of a page. Then round to a page. 950 */ 951 952 if (mdio->md_size == 0) { 953 mddestroy(sc, td); 954 return (EDOM); 955 } 956 957 /* 958 * Allocate an OBJT_SWAP object. 959 * 960 * sc_secsize is PAGE_SIZE'd 961 * 962 * mdio->size is in DEV_BSIZE'd chunks. 963 * Note the truncation. 964 */ 965 966 sc->secsize = PAGE_SIZE; 967 sc->nsect = mdio->md_size / (PAGE_SIZE / DEV_BSIZE); 968 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, sc->secsize * (vm_offset_t)sc->nsect, VM_PROT_DEFAULT, 0); 969 sc->flags = mdio->md_options & MD_FORCE; 970 if (mdio->md_options & MD_RESERVE) { 971 if (swap_pager_reserve(sc->object, 0, sc->nsect) < 0) { 972 vm_pager_deallocate(sc->object); 973 sc->object = NULL; 974 mddestroy(sc, td); 975 return (EDOM); 976 } 977 } 978 error = mdsetcred(sc, td->td_ucred); 979 if (error) { 980 mddestroy(sc, td); 981 return (error); 982 } 983 mdinit(sc); 984 if (!(mdio->md_options & MD_RESERVE)) 985 sc->pp->flags |= G_PF_CANDELETE; 986 return (0); 987 } 988 989 static int 990 mddetach(int unit, struct thread *td) 991 { 992 struct md_s *sc; 993 994 sc = mdfind(unit); 995 if (sc == NULL) 996 return (ENOENT); 997 if (sc->opencount != 0 && !(sc->flags & MD_FORCE)) 998 return (EBUSY); 999 switch(sc->type) { 1000 case MD_VNODE: 1001 case MD_SWAP: 1002 case MD_MALLOC: 1003 case MD_PRELOAD: 1004 return (mddestroy(sc, td)); 1005 default: 1006 return (EOPNOTSUPP); 1007 } 1008 } 1009 1010 static int 1011 mdctlioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 1012 { 1013 struct md_ioctl *mdio; 1014 struct md_s *sc; 1015 int i; 1016 1017 if (md_debug) 1018 printf("mdctlioctl(%s %lx %p %x %p)\n", 1019 devtoname(dev), cmd, addr, flags, td); 1020 1021 /* 1022 * We assert the version number in the individual ioctl 1023 * handlers instead of out here because (a) it is possible we 1024 * may add another ioctl in the future which doesn't read an 1025 * mdio, and (b) the correct return value for an unknown ioctl 1026 * is ENOIOCTL, not EINVAL. 1027 */ 1028 mdio = (struct md_ioctl *)addr; 1029 switch (cmd) { 1030 case MDIOCATTACH: 1031 if (mdio->md_version != MDIOVERSION) 1032 return (EINVAL); 1033 switch (mdio->md_type) { 1034 case MD_MALLOC: 1035 return (mdcreate_malloc(mdio)); 1036 case MD_PRELOAD: 1037 return (mdcreate_preload(mdio)); 1038 case MD_VNODE: 1039 return (mdcreate_vnode(mdio, td)); 1040 case MD_SWAP: 1041 return (mdcreate_swap(mdio, td)); 1042 default: 1043 return (EINVAL); 1044 } 1045 case MDIOCDETACH: 1046 if (mdio->md_version != MDIOVERSION) 1047 return (EINVAL); 1048 if (mdio->md_file != NULL || mdio->md_size != 0 || 1049 mdio->md_options != 0) 1050 return (EINVAL); 1051 return (mddetach(mdio->md_unit, td)); 1052 case MDIOCQUERY: 1053 if (mdio->md_version != MDIOVERSION) 1054 return (EINVAL); 1055 sc = mdfind(mdio->md_unit); 1056 if (sc == NULL) 1057 return (ENOENT); 1058 mdio->md_type = sc->type; 1059 mdio->md_options = sc->flags; 1060 switch (sc->type) { 1061 case MD_MALLOC: 1062 mdio->md_size = sc->nsect; 1063 break; 1064 case MD_PRELOAD: 1065 mdio->md_size = sc->nsect; 1066 mdio->md_base = (uint64_t)(intptr_t)sc->pl_ptr; 1067 break; 1068 case MD_SWAP: 1069 mdio->md_size = sc->nsect * (PAGE_SIZE / DEV_BSIZE); 1070 break; 1071 case MD_VNODE: 1072 mdio->md_size = sc->nsect; 1073 /* XXX fill this in */ 1074 mdio->md_file = NULL; 1075 break; 1076 } 1077 return (0); 1078 case MDIOCLIST: 1079 i = 1; 1080 LIST_FOREACH(sc, &md_softc_list, list) { 1081 if (i == MDNPAD - 1) 1082 mdio->md_pad[i] = -1; 1083 else 1084 mdio->md_pad[i++] = sc->unit; 1085 } 1086 mdio->md_pad[0] = i - 1; 1087 return (0); 1088 default: 1089 return (ENOIOCTL); 1090 }; 1091 return (ENOIOCTL); 1092 } 1093 1094 static void 1095 md_preloaded(u_char *image, unsigned length) 1096 { 1097 struct md_s *sc; 1098 1099 sc = mdnew(-1); 1100 if (sc == NULL) 1101 return; 1102 sc->type = MD_PRELOAD; 1103 sc->secsize = DEV_BSIZE; 1104 sc->nsect = length / DEV_BSIZE; 1105 sc->pl_ptr = image; 1106 sc->pl_len = length; 1107 if (sc->unit == 0) 1108 mdrootready = 1; 1109 mdinit(sc); 1110 } 1111 1112 static void 1113 md_drvinit(void *unused) 1114 { 1115 1116 caddr_t mod; 1117 caddr_t c; 1118 u_char *ptr, *name, *type; 1119 unsigned len; 1120 1121 #ifdef MD_ROOT_SIZE 1122 md_preloaded(mfs_root, MD_ROOT_SIZE*1024); 1123 #endif 1124 mod = NULL; 1125 while ((mod = preload_search_next_name(mod)) != NULL) { 1126 name = (char *)preload_search_info(mod, MODINFO_NAME); 1127 type = (char *)preload_search_info(mod, MODINFO_TYPE); 1128 if (name == NULL) 1129 continue; 1130 if (type == NULL) 1131 continue; 1132 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 1133 continue; 1134 c = preload_search_info(mod, MODINFO_ADDR); 1135 ptr = *(u_char **)c; 1136 c = preload_search_info(mod, MODINFO_SIZE); 1137 len = *(size_t *)c; 1138 printf("%s%d: Preloaded image <%s> %d bytes at %p\n", 1139 MD_NAME, mdunits, name, len, ptr); 1140 md_preloaded(ptr, len); 1141 } 1142 status_dev = make_dev(&mdctl_cdevsw, 0xffff00ff, UID_ROOT, GID_WHEEL, 1143 0600, MDCTL_NAME); 1144 } 1145 1146 static int 1147 md_modevent(module_t mod, int type, void *data) 1148 { 1149 int error; 1150 struct md_s *sc; 1151 1152 switch (type) { 1153 case MOD_LOAD: 1154 md_drvinit(NULL); 1155 break; 1156 case MOD_UNLOAD: 1157 LIST_FOREACH(sc, &md_softc_list, list) { 1158 error = mddetach(sc->unit, curthread); 1159 if (error != 0) 1160 return (error); 1161 } 1162 if (status_dev) 1163 destroy_dev(status_dev); 1164 status_dev = 0; 1165 break; 1166 default: 1167 break; 1168 } 1169 return (0); 1170 } 1171 1172 static moduledata_t md_mod = { 1173 MD_NAME, 1174 md_modevent, 1175 NULL 1176 }; 1177 DECLARE_MODULE(md, md_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE+CDEV_MAJOR); 1178 MODULE_VERSION(md, MD_MODVER); 1179 1180 1181 #ifdef MD_ROOT 1182 static void 1183 md_takeroot(void *junk) 1184 { 1185 if (mdrootready) 1186 rootdevnames[0] = "ufs:/dev/md0"; 1187 } 1188 1189 SYSINIT(md_root, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, md_takeroot, NULL); 1190 #endif /* MD_ROOT */ 1191