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/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 <geom/geom.h> 84 85 #include <vm/vm.h> 86 #include <vm/vm_object.h> 87 #include <vm/vm_page.h> 88 #include <vm/vm_pager.h> 89 #include <vm/swap_pager.h> 90 #include <vm/uma.h> 91 92 #define MD_MODVER 1 93 94 #define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */ 95 96 #ifndef MD_NSECT 97 #define MD_NSECT (10000 * 2) 98 #endif 99 100 static MALLOC_DEFINE(M_MD, "MD disk", "Memory Disk"); 101 static MALLOC_DEFINE(M_MDSECT, "MD sectors", "Memory Disk Sectors"); 102 103 static int md_debug; 104 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, ""); 105 106 #if defined(MD_ROOT) && defined(MD_ROOT_SIZE) 107 /* Image gets put here: */ 108 static u_char mfs_root[MD_ROOT_SIZE*1024] = "MFS Filesystem goes here"; 109 static u_char end_mfs_root[] __unused = "MFS Filesystem had better STOP here"; 110 #endif 111 112 static int mdrootready; 113 static int mdunits; 114 static dev_t status_dev = 0; 115 116 #define CDEV_MAJOR 95 117 118 static d_ioctl_t mdctlioctl; 119 120 static struct cdevsw mdctl_cdevsw = { 121 .d_open = nullopen, 122 .d_close = nullclose, 123 .d_ioctl = mdctlioctl, 124 .d_name = MD_NAME, 125 .d_maj = CDEV_MAJOR 126 }; 127 128 129 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(&md_softc_list); 130 131 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 132 #define NMASK (NINDIR-1) 133 static int nshift; 134 135 struct indir { 136 uintptr_t *array; 137 uint total; 138 uint used; 139 uint shift; 140 }; 141 142 struct md_s { 143 int unit; 144 LIST_ENTRY(md_s) list; 145 struct bio_queue_head bio_queue; 146 struct mtx queue_mtx; 147 struct disk disk; 148 dev_t dev; 149 enum md_types type; 150 unsigned nsect; 151 unsigned opencount; 152 unsigned secsize; 153 unsigned flags; 154 char name[20]; 155 struct proc *procp; 156 struct g_geom *gp; 157 struct g_provider *pp; 158 159 /* MD_MALLOC related fields */ 160 struct indir *indir; 161 uma_zone_t uma; 162 163 /* MD_PRELOAD related fields */ 164 u_char *pl_ptr; 165 unsigned pl_len; 166 167 /* MD_VNODE related fields */ 168 struct vnode *vnode; 169 struct ucred *cred; 170 171 /* MD_SWAP related fields */ 172 vm_object_t object; 173 }; 174 175 static int mddestroy(struct md_s *sc, struct thread *td); 176 177 static struct indir * 178 new_indir(uint shift) 179 { 180 struct indir *ip; 181 182 ip = malloc(sizeof *ip, M_MD, M_NOWAIT | M_ZERO); 183 if (ip == NULL) 184 return (NULL); 185 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 186 M_MDSECT, M_NOWAIT | M_ZERO); 187 if (ip->array == NULL) { 188 free(ip, M_MD); 189 return (NULL); 190 } 191 ip->total = NINDIR; 192 ip->shift = shift; 193 return (ip); 194 } 195 196 static void 197 del_indir(struct indir *ip) 198 { 199 200 free(ip->array, M_MDSECT); 201 free(ip, M_MD); 202 } 203 204 static void 205 destroy_indir(struct md_s *sc, struct indir *ip) 206 { 207 int i; 208 209 for (i = 0; i < NINDIR; i++) { 210 if (!ip->array[i]) 211 continue; 212 if (ip->shift) 213 destroy_indir(sc, (struct indir*)(ip->array[i])); 214 else if (ip->array[i] > 255) 215 uma_zfree(sc->uma, (void *)(ip->array[i])); 216 } 217 del_indir(ip); 218 } 219 220 /* 221 * This function does the math and alloctes the top level "indir" structure 222 * for a device of "size" sectors. 223 */ 224 225 static struct indir * 226 dimension(off_t size) 227 { 228 off_t rcnt; 229 struct indir *ip; 230 int i, layer; 231 232 rcnt = size; 233 layer = 0; 234 while (rcnt > NINDIR) { 235 rcnt /= NINDIR; 236 layer++; 237 } 238 /* figure out log2(NINDIR) */ 239 for (i = NINDIR, nshift = -1; i; nshift++) 240 i >>= 1; 241 242 /* 243 * XXX: the top layer is probably not fully populated, so we allocate 244 * too much space for ip->array in new_indir() here. 245 */ 246 ip = new_indir(layer * nshift); 247 return (ip); 248 } 249 250 /* 251 * Read a given sector 252 */ 253 254 static uintptr_t 255 s_read(struct indir *ip, off_t offset) 256 { 257 struct indir *cip; 258 int idx; 259 uintptr_t up; 260 261 if (md_debug > 1) 262 printf("s_read(%jd)\n", (intmax_t)offset); 263 up = 0; 264 for (cip = ip; cip != NULL;) { 265 if (cip->shift) { 266 idx = (offset >> cip->shift) & NMASK; 267 up = cip->array[idx]; 268 cip = (struct indir *)up; 269 continue; 270 } 271 idx = offset & NMASK; 272 return (cip->array[idx]); 273 } 274 return (0); 275 } 276 277 /* 278 * Write a given sector, prune the tree if the value is 0 279 */ 280 281 static int 282 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 283 { 284 struct indir *cip, *lip[10]; 285 int idx, li; 286 uintptr_t up; 287 288 if (md_debug > 1) 289 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 290 up = 0; 291 li = 0; 292 cip = ip; 293 for (;;) { 294 lip[li++] = cip; 295 if (cip->shift) { 296 idx = (offset >> cip->shift) & NMASK; 297 up = cip->array[idx]; 298 if (up != 0) { 299 cip = (struct indir *)up; 300 continue; 301 } 302 /* Allocate branch */ 303 cip->array[idx] = 304 (uintptr_t)new_indir(cip->shift - nshift); 305 if (cip->array[idx] == 0) 306 return (ENOSPC); 307 cip->used++; 308 up = cip->array[idx]; 309 cip = (struct indir *)up; 310 continue; 311 } 312 /* leafnode */ 313 idx = offset & NMASK; 314 up = cip->array[idx]; 315 if (up != 0) 316 cip->used--; 317 cip->array[idx] = ptr; 318 if (ptr != 0) 319 cip->used++; 320 break; 321 } 322 if (cip->used != 0 || li == 1) 323 return (0); 324 li--; 325 while (cip->used == 0 && cip != ip) { 326 li--; 327 idx = (offset >> lip[li]->shift) & NMASK; 328 up = lip[li]->array[idx]; 329 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 330 del_indir(cip); 331 lip[li]->array[idx] = 0; 332 lip[li]->used--; 333 cip = lip[li]; 334 } 335 return (0); 336 } 337 338 339 struct g_class g_md_class = { 340 "MD", 341 NULL, 342 NULL, 343 G_CLASS_INITIALIZER 344 345 }; 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 switch(bp->bio_cmd) { 372 case BIO_GETATTR: 373 case BIO_SETATTR: 374 g_io_deliver(bp, EOPNOTSUPP); 375 return; 376 } 377 bp->bio_blkno = bp->bio_offset >> DEV_BSHIFT; 378 bp->bio_pblkno = bp->bio_offset / sc->secsize; 379 bp->bio_bcount = bp->bio_length; 380 mtx_lock(&sc->queue_mtx); 381 bioqdisksort(&sc->bio_queue, bp); 382 mtx_unlock(&sc->queue_mtx); 383 384 wakeup(sc); 385 } 386 387 DECLARE_GEOM_CLASS(g_md_class, g_md); 388 389 390 static int 391 mdstart_malloc(struct md_s *sc, struct bio *bp) 392 { 393 int i, error; 394 u_char *dst; 395 unsigned secno, nsec, uc; 396 uintptr_t sp, osp; 397 398 nsec = bp->bio_bcount / sc->secsize; 399 secno = bp->bio_pblkno; 400 dst = bp->bio_data; 401 error = 0; 402 while (nsec--) { 403 osp = s_read(sc->indir, secno); 404 if (bp->bio_cmd == BIO_DELETE) { 405 if (osp != 0) 406 error = s_write(sc->indir, secno, 0); 407 } else if (bp->bio_cmd == BIO_READ) { 408 if (osp == 0) 409 bzero(dst, sc->secsize); 410 else if (osp <= 255) 411 for (i = 0; i < sc->secsize; i++) 412 dst[i] = osp; 413 else 414 bcopy((void *)osp, dst, sc->secsize); 415 osp = 0; 416 } else if (bp->bio_cmd == BIO_WRITE) { 417 if (sc->flags & MD_COMPRESS) { 418 uc = dst[0]; 419 for (i = 1; i < sc->secsize; i++) 420 if (dst[i] != uc) 421 break; 422 } else { 423 i = 0; 424 uc = 0; 425 } 426 if (i == sc->secsize) { 427 if (osp != uc) 428 error = s_write(sc->indir, secno, uc); 429 } else { 430 if (osp <= 255) { 431 sp = (uintptr_t) uma_zalloc( 432 sc->uma, M_NOWAIT); 433 if (sp == 0) { 434 error = ENOSPC; 435 break; 436 } 437 bcopy(dst, (void *)sp, sc->secsize); 438 error = s_write(sc->indir, secno, sp); 439 } else { 440 bcopy(dst, (void *)osp, sc->secsize); 441 osp = 0; 442 } 443 } 444 } else { 445 error = EOPNOTSUPP; 446 } 447 if (osp > 255) 448 uma_zfree(sc->uma, (void*)osp); 449 if (error) 450 break; 451 secno++; 452 dst += sc->secsize; 453 } 454 bp->bio_resid = 0; 455 return (error); 456 } 457 458 static int 459 mdstart_preload(struct md_s *sc, struct bio *bp) 460 { 461 462 if (bp->bio_cmd == BIO_DELETE) { 463 } else if (bp->bio_cmd == BIO_READ) { 464 bcopy(sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_data, bp->bio_bcount); 465 } else { 466 bcopy(bp->bio_data, sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_bcount); 467 } 468 bp->bio_resid = 0; 469 return (0); 470 } 471 472 static int 473 mdstart_vnode(struct md_s *sc, struct bio *bp) 474 { 475 int error; 476 struct uio auio; 477 struct iovec aiov; 478 struct mount *mp; 479 480 /* 481 * VNODE I/O 482 * 483 * If an error occurs, we set BIO_ERROR but we do not set 484 * B_INVAL because (for a write anyway), the buffer is 485 * still valid. 486 */ 487 488 bzero(&auio, sizeof(auio)); 489 490 aiov.iov_base = bp->bio_data; 491 aiov.iov_len = bp->bio_bcount; 492 auio.uio_iov = &aiov; 493 auio.uio_iovcnt = 1; 494 auio.uio_offset = (vm_ooffset_t)bp->bio_pblkno * sc->secsize; 495 auio.uio_segflg = UIO_SYSSPACE; 496 if(bp->bio_cmd == BIO_READ) 497 auio.uio_rw = UIO_READ; 498 else 499 auio.uio_rw = UIO_WRITE; 500 auio.uio_resid = bp->bio_bcount; 501 auio.uio_td = curthread; 502 /* 503 * When reading set IO_DIRECT to try to avoid double-caching 504 * the data. When writing IO_DIRECT is not optimal, but we 505 * must set IO_NOWDRAIN to avoid a wdrain deadlock. 506 */ 507 if (bp->bio_cmd == BIO_READ) { 508 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 509 error = VOP_READ(sc->vnode, &auio, IO_DIRECT, sc->cred); 510 } else { 511 (void) vn_start_write(sc->vnode, &mp, V_WAIT); 512 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 513 error = VOP_WRITE(sc->vnode, &auio, IO_NOWDRAIN, sc->cred); 514 vn_finished_write(mp); 515 } 516 VOP_UNLOCK(sc->vnode, 0, curthread); 517 bp->bio_resid = auio.uio_resid; 518 return (error); 519 } 520 521 static void 522 mddone_swap(struct bio *bp) 523 { 524 525 bp->bio_completed = bp->bio_length - bp->bio_resid; 526 g_std_done(bp); 527 } 528 529 static int 530 mdstart_swap(struct md_s *sc, struct bio *bp) 531 { 532 { 533 struct bio *bp2; 534 535 bp2 = g_clone_bio(bp); 536 bp2->bio_done = mddone_swap; 537 bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; 538 bp2->bio_pblkno = bp2->bio_offset / sc->secsize; 539 bp2->bio_bcount = bp2->bio_length; 540 bp = bp2; 541 } 542 543 bp->bio_resid = 0; 544 if ((bp->bio_cmd == BIO_DELETE) && (sc->flags & MD_RESERVE)) 545 biodone(bp); 546 else 547 vm_pager_strategy(sc->object, bp); 548 return (-1); 549 } 550 551 static void 552 md_kthread(void *arg) 553 { 554 struct md_s *sc; 555 struct bio *bp; 556 int error, hasgiant; 557 558 sc = arg; 559 curthread->td_base_pri = PRIBIO; 560 561 switch (sc->type) { 562 case MD_SWAP: 563 case MD_VNODE: 564 mtx_lock(&Giant); 565 hasgiant = 1; 566 break; 567 case MD_MALLOC: 568 case MD_PRELOAD: 569 default: 570 hasgiant = 0; 571 break; 572 } 573 574 for (;;) { 575 mtx_lock(&sc->queue_mtx); 576 bp = bioq_first(&sc->bio_queue); 577 if (bp) 578 bioq_remove(&sc->bio_queue, bp); 579 if (!bp) { 580 if (sc->flags & MD_SHUTDOWN) { 581 mtx_unlock(&sc->queue_mtx); 582 sc->procp = NULL; 583 wakeup(&sc->procp); 584 if (!hasgiant) 585 mtx_lock(&Giant); 586 kthread_exit(0); 587 } 588 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 589 continue; 590 } 591 mtx_unlock(&sc->queue_mtx); 592 593 switch (sc->type) { 594 case MD_MALLOC: 595 error = mdstart_malloc(sc, bp); 596 break; 597 case MD_PRELOAD: 598 error = mdstart_preload(sc, bp); 599 break; 600 case MD_VNODE: 601 error = mdstart_vnode(sc, bp); 602 break; 603 case MD_SWAP: 604 error = mdstart_swap(sc, bp); 605 break; 606 default: 607 panic("Impossible md(type)"); 608 break; 609 } 610 611 if (error != -1) { 612 bp->bio_completed = bp->bio_length; 613 g_io_deliver(bp, error); 614 } 615 } 616 } 617 618 static struct md_s * 619 mdfind(int unit) 620 { 621 struct md_s *sc; 622 623 /* XXX: LOCK(unique unit numbers) */ 624 LIST_FOREACH(sc, &md_softc_list, list) { 625 if (sc->unit == unit) 626 break; 627 } 628 /* XXX: UNLOCK(unique unit numbers) */ 629 return (sc); 630 } 631 632 static struct md_s * 633 mdnew(int unit) 634 { 635 struct md_s *sc; 636 int error, max = -1; 637 638 /* XXX: LOCK(unique unit numbers) */ 639 LIST_FOREACH(sc, &md_softc_list, list) { 640 if (sc->unit == unit) { 641 /* XXX: UNLOCK(unique unit numbers) */ 642 return (NULL); 643 } 644 if (sc->unit > max) 645 max = sc->unit; 646 } 647 if (unit == -1) 648 unit = max + 1; 649 if (unit > 255) 650 return (NULL); 651 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 652 sc->unit = unit; 653 bioq_init(&sc->bio_queue); 654 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 655 sprintf(sc->name, "md%d", unit); 656 error = kthread_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 657 if (error) { 658 free(sc, M_MD); 659 return (NULL); 660 } 661 LIST_INSERT_HEAD(&md_softc_list, sc, list); 662 /* XXX: UNLOCK(unique unit numbers) */ 663 return (sc); 664 } 665 666 static void 667 mdinit(struct md_s *sc) 668 { 669 670 struct g_geom *gp; 671 struct g_provider *pp; 672 673 DROP_GIANT(); 674 g_topology_lock(); 675 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 676 gp->start = g_md_start; 677 gp->access = g_md_access; 678 gp->softc = sc; 679 pp = g_new_providerf(gp, "md%d", sc->unit); 680 pp->mediasize = (off_t)sc->nsect * sc->secsize; 681 pp->sectorsize = sc->secsize; 682 sc->gp = gp; 683 sc->pp = pp; 684 g_error_provider(pp, 0); 685 g_topology_unlock(); 686 PICKUP_GIANT(); 687 } 688 689 /* 690 * XXX: we should check that the range they feed us is mapped. 691 * XXX: we should implement read-only. 692 */ 693 694 static int 695 mdcreate_preload(struct md_ioctl *mdio) 696 { 697 struct md_s *sc; 698 699 if (mdio->md_size == 0) 700 return (EINVAL); 701 if (mdio->md_options & ~(MD_AUTOUNIT)) 702 return (EINVAL); 703 if (mdio->md_options & MD_AUTOUNIT) { 704 sc = mdnew(-1); 705 if (sc == NULL) 706 return (ENOMEM); 707 mdio->md_unit = sc->unit; 708 } else { 709 sc = mdnew(mdio->md_unit); 710 if (sc == NULL) 711 return (EBUSY); 712 } 713 sc->type = MD_PRELOAD; 714 sc->secsize = DEV_BSIZE; 715 sc->nsect = mdio->md_size; 716 sc->flags = mdio->md_options & MD_FORCE; 717 /* Cast to pointer size, then to pointer to avoid warning */ 718 sc->pl_ptr = (u_char *)(uintptr_t)mdio->md_base; 719 sc->pl_len = (mdio->md_size << DEV_BSHIFT); 720 mdinit(sc); 721 return (0); 722 } 723 724 725 static int 726 mdcreate_malloc(struct md_ioctl *mdio) 727 { 728 struct md_s *sc; 729 off_t u; 730 uintptr_t sp; 731 int error; 732 733 error = 0; 734 if (mdio->md_size == 0) 735 return (EINVAL); 736 if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 737 return (EINVAL); 738 if (mdio->md_secsize != 0 && !powerof2(mdio->md_secsize)) 739 return (EINVAL); 740 /* Compression doesn't make sense if we have reserved space */ 741 if (mdio->md_options & MD_RESERVE) 742 mdio->md_options &= ~MD_COMPRESS; 743 if (mdio->md_options & MD_AUTOUNIT) { 744 sc = mdnew(-1); 745 if (sc == NULL) 746 return (ENOMEM); 747 mdio->md_unit = sc->unit; 748 } else { 749 sc = mdnew(mdio->md_unit); 750 if (sc == NULL) 751 return (EBUSY); 752 } 753 sc->type = MD_MALLOC; 754 if (mdio->md_secsize != 0) 755 sc->secsize = mdio->md_secsize; 756 else 757 sc->secsize = DEV_BSIZE; 758 sc->nsect = mdio->md_size; 759 sc->nsect /= (sc->secsize / DEV_BSIZE); 760 sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE); 761 sc->indir = dimension(sc->nsect); 762 sc->uma = uma_zcreate(sc->name, sc->secsize, 763 NULL, NULL, NULL, NULL, 0x1ff, 0); 764 if (mdio->md_options & MD_RESERVE) { 765 for (u = 0; u < sc->nsect; u++) { 766 sp = (uintptr_t) uma_zalloc(sc->uma, M_NOWAIT | M_ZERO); 767 if (sp != 0) 768 error = s_write(sc->indir, u, sp); 769 else 770 error = ENOMEM; 771 if (error) 772 break; 773 } 774 } 775 if (error) { 776 mddestroy(sc, NULL); 777 return (error); 778 } 779 mdinit(sc); 780 if (!(mdio->md_options & MD_RESERVE)) 781 sc->pp->flags |= G_PF_CANDELETE; 782 return (0); 783 } 784 785 786 static int 787 mdsetcred(struct md_s *sc, struct ucred *cred) 788 { 789 char *tmpbuf; 790 int error = 0; 791 792 /* 793 * Set credits in our softc 794 */ 795 796 if (sc->cred) 797 crfree(sc->cred); 798 sc->cred = crhold(cred); 799 800 /* 801 * Horrible kludge to establish credentials for NFS XXX. 802 */ 803 804 if (sc->vnode) { 805 struct uio auio; 806 struct iovec aiov; 807 808 tmpbuf = malloc(sc->secsize, M_TEMP, M_WAITOK); 809 bzero(&auio, sizeof(auio)); 810 811 aiov.iov_base = tmpbuf; 812 aiov.iov_len = sc->secsize; 813 auio.uio_iov = &aiov; 814 auio.uio_iovcnt = 1; 815 auio.uio_offset = 0; 816 auio.uio_rw = UIO_READ; 817 auio.uio_segflg = UIO_SYSSPACE; 818 auio.uio_resid = aiov.iov_len; 819 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 820 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 821 VOP_UNLOCK(sc->vnode, 0, curthread); 822 free(tmpbuf, M_TEMP); 823 } 824 return (error); 825 } 826 827 static int 828 mdcreate_vnode(struct md_ioctl *mdio, struct thread *td) 829 { 830 struct md_s *sc; 831 struct vattr vattr; 832 struct nameidata nd; 833 int error, flags; 834 835 flags = FREAD|FWRITE; 836 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 837 error = vn_open(&nd, &flags, 0); 838 if (error) { 839 if (error != EACCES && error != EPERM && error != EROFS) 840 return (error); 841 flags &= ~FWRITE; 842 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 843 error = vn_open(&nd, &flags, 0); 844 if (error) 845 return (error); 846 } 847 NDFREE(&nd, NDF_ONLY_PNBUF); 848 if (nd.ni_vp->v_type != VREG || 849 (error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred, td))) { 850 VOP_UNLOCK(nd.ni_vp, 0, td); 851 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 852 return (error ? error : EINVAL); 853 } 854 VOP_UNLOCK(nd.ni_vp, 0, td); 855 856 if (mdio->md_options & MD_AUTOUNIT) { 857 sc = mdnew(-1); 858 mdio->md_unit = sc->unit; 859 } else { 860 sc = mdnew(mdio->md_unit); 861 } 862 if (sc == NULL) { 863 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 864 return (EBUSY); 865 } 866 867 sc->type = MD_VNODE; 868 sc->flags = mdio->md_options & MD_FORCE; 869 if (!(flags & FWRITE)) 870 sc->flags |= MD_READONLY; 871 sc->secsize = DEV_BSIZE; 872 sc->vnode = nd.ni_vp; 873 874 /* 875 * If the size is specified, override the file attributes. 876 */ 877 if (mdio->md_size) 878 sc->nsect = mdio->md_size; 879 else 880 sc->nsect = vattr.va_size / sc->secsize; /* XXX: round up ? */ 881 if (sc->nsect == 0) { 882 mddestroy(sc, td); 883 return (EINVAL); 884 } 885 error = mdsetcred(sc, td->td_ucred); 886 if (error) { 887 mddestroy(sc, td); 888 return (error); 889 } 890 mdinit(sc); 891 return (0); 892 } 893 894 static int 895 mddestroy(struct md_s *sc, struct thread *td) 896 { 897 898 GIANT_REQUIRED; 899 900 mtx_destroy(&sc->queue_mtx); 901 if (sc->gp) { 902 sc->gp->flags |= G_GEOM_WITHER; 903 sc->gp->softc = NULL; 904 } 905 if (sc->pp) 906 g_orphan_provider(sc->pp, ENXIO); 907 sc->flags |= MD_SHUTDOWN; 908 wakeup(sc); 909 while (sc->procp != NULL) 910 tsleep(&sc->procp, PRIBIO, "mddestroy", hz / 10); 911 if (sc->vnode != NULL) 912 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 913 FREAD : (FREAD|FWRITE), sc->cred, td); 914 if (sc->cred != NULL) 915 crfree(sc->cred); 916 if (sc->object != NULL) { 917 vm_pager_deallocate(sc->object); 918 } 919 if (sc->indir) 920 destroy_indir(sc, sc->indir); 921 if (sc->uma) 922 uma_zdestroy(sc->uma); 923 924 /* XXX: LOCK(unique unit numbers) */ 925 LIST_REMOVE(sc, list); 926 /* XXX: UNLOCK(unique unit numbers) */ 927 free(sc, M_MD); 928 return (0); 929 } 930 931 static int 932 mdcreate_swap(struct md_ioctl *mdio, struct thread *td) 933 { 934 int error; 935 struct md_s *sc; 936 937 GIANT_REQUIRED; 938 939 if (mdio->md_options & MD_AUTOUNIT) { 940 sc = mdnew(-1); 941 mdio->md_unit = sc->unit; 942 } else { 943 sc = mdnew(mdio->md_unit); 944 } 945 if (sc == NULL) 946 return (EBUSY); 947 948 sc->type = MD_SWAP; 949 950 /* 951 * Range check. Disallow negative sizes or any size less then the 952 * size of a page. Then round to a page. 953 */ 954 955 if (mdio->md_size == 0) { 956 mddestroy(sc, td); 957 return (EDOM); 958 } 959 960 /* 961 * Allocate an OBJT_SWAP object. 962 * 963 * sc_secsize is PAGE_SIZE'd 964 * 965 * mdio->size is in DEV_BSIZE'd chunks. 966 * Note the truncation. 967 */ 968 969 sc->secsize = PAGE_SIZE; 970 sc->nsect = mdio->md_size / (PAGE_SIZE / DEV_BSIZE); 971 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, sc->secsize * (vm_offset_t)sc->nsect, VM_PROT_DEFAULT, 0); 972 sc->flags = mdio->md_options & MD_FORCE; 973 if (mdio->md_options & MD_RESERVE) { 974 if (swap_pager_reserve(sc->object, 0, sc->nsect) < 0) { 975 vm_pager_deallocate(sc->object); 976 sc->object = NULL; 977 mddestroy(sc, td); 978 return (EDOM); 979 } 980 } 981 error = mdsetcred(sc, td->td_ucred); 982 if (error) { 983 mddestroy(sc, td); 984 return (error); 985 } 986 mdinit(sc); 987 if (!(mdio->md_options & MD_RESERVE)) 988 sc->pp->flags |= G_PF_CANDELETE; 989 return (0); 990 } 991 992 static int 993 mddetach(int unit, struct thread *td) 994 { 995 struct md_s *sc; 996 997 sc = mdfind(unit); 998 if (sc == NULL) 999 return (ENOENT); 1000 if (sc->opencount != 0 && !(sc->flags & MD_FORCE)) 1001 return (EBUSY); 1002 switch(sc->type) { 1003 case MD_VNODE: 1004 case MD_SWAP: 1005 case MD_MALLOC: 1006 case MD_PRELOAD: 1007 return (mddestroy(sc, td)); 1008 default: 1009 return (EOPNOTSUPP); 1010 } 1011 } 1012 1013 static int 1014 mdctlioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 1015 { 1016 struct md_ioctl *mdio; 1017 struct md_s *sc; 1018 int i; 1019 1020 if (md_debug) 1021 printf("mdctlioctl(%s %lx %p %x %p)\n", 1022 devtoname(dev), cmd, addr, flags, td); 1023 1024 /* 1025 * We assert the version number in the individual ioctl 1026 * handlers instead of out here because (a) it is possible we 1027 * may add another ioctl in the future which doesn't read an 1028 * mdio, and (b) the correct return value for an unknown ioctl 1029 * is ENOIOCTL, not EINVAL. 1030 */ 1031 mdio = (struct md_ioctl *)addr; 1032 switch (cmd) { 1033 case MDIOCATTACH: 1034 if (mdio->md_version != MDIOVERSION) 1035 return (EINVAL); 1036 switch (mdio->md_type) { 1037 case MD_MALLOC: 1038 return (mdcreate_malloc(mdio)); 1039 case MD_PRELOAD: 1040 return (mdcreate_preload(mdio)); 1041 case MD_VNODE: 1042 return (mdcreate_vnode(mdio, td)); 1043 case MD_SWAP: 1044 return (mdcreate_swap(mdio, td)); 1045 default: 1046 return (EINVAL); 1047 } 1048 case MDIOCDETACH: 1049 if (mdio->md_version != MDIOVERSION) 1050 return (EINVAL); 1051 if (mdio->md_file != NULL || mdio->md_size != 0 || 1052 mdio->md_options != 0) 1053 return (EINVAL); 1054 return (mddetach(mdio->md_unit, td)); 1055 case MDIOCQUERY: 1056 if (mdio->md_version != MDIOVERSION) 1057 return (EINVAL); 1058 sc = mdfind(mdio->md_unit); 1059 if (sc == NULL) 1060 return (ENOENT); 1061 mdio->md_type = sc->type; 1062 mdio->md_options = sc->flags; 1063 switch (sc->type) { 1064 case MD_MALLOC: 1065 mdio->md_size = sc->nsect; 1066 break; 1067 case MD_PRELOAD: 1068 mdio->md_size = sc->nsect; 1069 mdio->md_base = (uint64_t)(intptr_t)sc->pl_ptr; 1070 break; 1071 case MD_SWAP: 1072 mdio->md_size = sc->nsect * (PAGE_SIZE / DEV_BSIZE); 1073 break; 1074 case MD_VNODE: 1075 mdio->md_size = sc->nsect; 1076 /* XXX fill this in */ 1077 mdio->md_file = NULL; 1078 break; 1079 } 1080 return (0); 1081 case MDIOCLIST: 1082 i = 1; 1083 LIST_FOREACH(sc, &md_softc_list, list) { 1084 if (i == MDNPAD - 1) 1085 mdio->md_pad[i] = -1; 1086 else 1087 mdio->md_pad[i++] = sc->unit; 1088 } 1089 mdio->md_pad[0] = i - 1; 1090 return (0); 1091 default: 1092 return (ENOIOCTL); 1093 }; 1094 return (ENOIOCTL); 1095 } 1096 1097 static void 1098 md_preloaded(u_char *image, unsigned length) 1099 { 1100 struct md_s *sc; 1101 1102 sc = mdnew(-1); 1103 if (sc == NULL) 1104 return; 1105 sc->type = MD_PRELOAD; 1106 sc->secsize = DEV_BSIZE; 1107 sc->nsect = length / DEV_BSIZE; 1108 sc->pl_ptr = image; 1109 sc->pl_len = length; 1110 if (sc->unit == 0) 1111 mdrootready = 1; 1112 mdinit(sc); 1113 } 1114 1115 static void 1116 md_drvinit(void *unused) 1117 { 1118 1119 caddr_t mod; 1120 caddr_t c; 1121 u_char *ptr, *name, *type; 1122 unsigned len; 1123 1124 #ifdef MD_ROOT_SIZE 1125 md_preloaded(mfs_root, MD_ROOT_SIZE*1024); 1126 #endif 1127 mod = NULL; 1128 while ((mod = preload_search_next_name(mod)) != NULL) { 1129 name = (char *)preload_search_info(mod, MODINFO_NAME); 1130 type = (char *)preload_search_info(mod, MODINFO_TYPE); 1131 if (name == NULL) 1132 continue; 1133 if (type == NULL) 1134 continue; 1135 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 1136 continue; 1137 c = preload_search_info(mod, MODINFO_ADDR); 1138 ptr = *(u_char **)c; 1139 c = preload_search_info(mod, MODINFO_SIZE); 1140 len = *(size_t *)c; 1141 printf("%s%d: Preloaded image <%s> %d bytes at %p\n", 1142 MD_NAME, mdunits, name, len, ptr); 1143 md_preloaded(ptr, len); 1144 } 1145 status_dev = make_dev(&mdctl_cdevsw, 0xffff00ff, UID_ROOT, GID_WHEEL, 1146 0600, MDCTL_NAME); 1147 } 1148 1149 static int 1150 md_modevent(module_t mod, int type, void *data) 1151 { 1152 int error; 1153 struct md_s *sc; 1154 1155 switch (type) { 1156 case MOD_LOAD: 1157 md_drvinit(NULL); 1158 break; 1159 case MOD_UNLOAD: 1160 LIST_FOREACH(sc, &md_softc_list, list) { 1161 error = mddetach(sc->unit, curthread); 1162 if (error != 0) 1163 return (error); 1164 } 1165 if (status_dev) 1166 destroy_dev(status_dev); 1167 status_dev = 0; 1168 break; 1169 default: 1170 break; 1171 } 1172 return (0); 1173 } 1174 1175 static moduledata_t md_mod = { 1176 MD_NAME, 1177 md_modevent, 1178 NULL 1179 }; 1180 DECLARE_MODULE(md, md_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE+CDEV_MAJOR); 1181 MODULE_VERSION(md, MD_MODVER); 1182 1183 1184 #ifdef MD_ROOT 1185 static void 1186 md_takeroot(void *junk) 1187 { 1188 if (mdrootready) 1189 rootdevnames[0] = "ufs:/dev/md0"; 1190 } 1191 1192 SYSINIT(md_root, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, md_takeroot, NULL); 1193 #endif /* MD_ROOT */ 1194