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 g_init_t md_drvinit; 111 112 static int mdrootready; 113 static int mdunits; 114 static dev_t status_dev = 0; 115 116 static d_ioctl_t mdctlioctl; 117 118 static struct cdevsw mdctl_cdevsw = { 119 .d_version = D_VERSION, 120 .d_flags = D_NEEDGIANT, 121 .d_ioctl = mdctlioctl, 122 .d_name = MD_NAME, 123 }; 124 125 126 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(&md_softc_list); 127 128 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 129 #define NMASK (NINDIR-1) 130 static int nshift; 131 132 struct indir { 133 uintptr_t *array; 134 u_int total; 135 u_int used; 136 u_int shift; 137 }; 138 139 struct md_s { 140 int unit; 141 LIST_ENTRY(md_s) list; 142 struct bio_queue_head bio_queue; 143 struct mtx queue_mtx; 144 dev_t dev; 145 enum md_types type; 146 unsigned nsect; 147 unsigned opencount; 148 unsigned secsize; 149 unsigned fwheads; 150 unsigned fwsectors; 151 unsigned flags; 152 char name[20]; 153 struct proc *procp; 154 struct g_geom *gp; 155 struct g_provider *pp; 156 157 /* MD_MALLOC related fields */ 158 struct indir *indir; 159 uma_zone_t uma; 160 161 /* MD_PRELOAD related fields */ 162 u_char *pl_ptr; 163 unsigned pl_len; 164 165 /* MD_VNODE related fields */ 166 struct vnode *vnode; 167 struct ucred *cred; 168 169 /* MD_SWAP related fields */ 170 vm_object_t object; 171 }; 172 173 static int mddestroy(struct md_s *sc, struct thread *td); 174 175 static struct indir * 176 new_indir(u_int shift) 177 { 178 struct indir *ip; 179 180 ip = malloc(sizeof *ip, M_MD, M_NOWAIT | M_ZERO); 181 if (ip == NULL) 182 return (NULL); 183 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 184 M_MDSECT, M_NOWAIT | M_ZERO); 185 if (ip->array == NULL) { 186 free(ip, M_MD); 187 return (NULL); 188 } 189 ip->total = NINDIR; 190 ip->shift = shift; 191 return (ip); 192 } 193 194 static void 195 del_indir(struct indir *ip) 196 { 197 198 free(ip->array, M_MDSECT); 199 free(ip, M_MD); 200 } 201 202 static void 203 destroy_indir(struct md_s *sc, struct indir *ip) 204 { 205 int i; 206 207 for (i = 0; i < NINDIR; i++) { 208 if (!ip->array[i]) 209 continue; 210 if (ip->shift) 211 destroy_indir(sc, (struct indir*)(ip->array[i])); 212 else if (ip->array[i] > 255) 213 uma_zfree(sc->uma, (void *)(ip->array[i])); 214 } 215 del_indir(ip); 216 } 217 218 /* 219 * This function does the math and alloctes the top level "indir" structure 220 * for a device of "size" sectors. 221 */ 222 223 static struct indir * 224 dimension(off_t size) 225 { 226 off_t rcnt; 227 struct indir *ip; 228 int i, layer; 229 230 rcnt = size; 231 layer = 0; 232 while (rcnt > NINDIR) { 233 rcnt /= NINDIR; 234 layer++; 235 } 236 /* figure out log2(NINDIR) */ 237 for (i = NINDIR, nshift = -1; i; nshift++) 238 i >>= 1; 239 240 /* 241 * XXX: the top layer is probably not fully populated, so we allocate 242 * too much space for ip->array in here. 243 */ 244 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO); 245 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 246 M_MDSECT, M_WAITOK | M_ZERO); 247 ip->total = NINDIR; 248 ip->shift = layer * nshift; 249 return (ip); 250 } 251 252 /* 253 * Read a given sector 254 */ 255 256 static uintptr_t 257 s_read(struct indir *ip, off_t offset) 258 { 259 struct indir *cip; 260 int idx; 261 uintptr_t up; 262 263 if (md_debug > 1) 264 printf("s_read(%jd)\n", (intmax_t)offset); 265 up = 0; 266 for (cip = ip; cip != NULL;) { 267 if (cip->shift) { 268 idx = (offset >> cip->shift) & NMASK; 269 up = cip->array[idx]; 270 cip = (struct indir *)up; 271 continue; 272 } 273 idx = offset & NMASK; 274 return (cip->array[idx]); 275 } 276 return (0); 277 } 278 279 /* 280 * Write a given sector, prune the tree if the value is 0 281 */ 282 283 static int 284 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 285 { 286 struct indir *cip, *lip[10]; 287 int idx, li; 288 uintptr_t up; 289 290 if (md_debug > 1) 291 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 292 up = 0; 293 li = 0; 294 cip = ip; 295 for (;;) { 296 lip[li++] = cip; 297 if (cip->shift) { 298 idx = (offset >> cip->shift) & NMASK; 299 up = cip->array[idx]; 300 if (up != 0) { 301 cip = (struct indir *)up; 302 continue; 303 } 304 /* Allocate branch */ 305 cip->array[idx] = 306 (uintptr_t)new_indir(cip->shift - nshift); 307 if (cip->array[idx] == 0) 308 return (ENOSPC); 309 cip->used++; 310 up = cip->array[idx]; 311 cip = (struct indir *)up; 312 continue; 313 } 314 /* leafnode */ 315 idx = offset & NMASK; 316 up = cip->array[idx]; 317 if (up != 0) 318 cip->used--; 319 cip->array[idx] = ptr; 320 if (ptr != 0) 321 cip->used++; 322 break; 323 } 324 if (cip->used != 0 || li == 1) 325 return (0); 326 li--; 327 while (cip->used == 0 && cip != ip) { 328 li--; 329 idx = (offset >> lip[li]->shift) & NMASK; 330 up = lip[li]->array[idx]; 331 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 332 del_indir(cip); 333 lip[li]->array[idx] = 0; 334 lip[li]->used--; 335 cip = lip[li]; 336 } 337 return (0); 338 } 339 340 341 struct g_class g_md_class = { 342 .name = "MD", 343 .init = md_drvinit, 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_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 if(bp->bio_cmd == BIO_WRITE) 493 auio.uio_rw = UIO_WRITE; 494 else 495 panic("wrong BIO_OP in mdstart_vnode"); 496 auio.uio_resid = bp->bio_bcount; 497 auio.uio_td = curthread; 498 /* 499 * When reading set IO_DIRECT to try to avoid double-caching 500 * the data. When writing IO_DIRECT is not optimal. 501 */ 502 if (bp->bio_cmd == BIO_READ) { 503 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 504 error = VOP_READ(sc->vnode, &auio, IO_DIRECT, sc->cred); 505 } else { 506 (void) vn_start_write(sc->vnode, &mp, V_WAIT); 507 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 508 error = VOP_WRITE(sc->vnode, &auio, 0, sc->cred); 509 vn_finished_write(mp); 510 } 511 VOP_UNLOCK(sc->vnode, 0, curthread); 512 bp->bio_resid = auio.uio_resid; 513 return (error); 514 } 515 516 #include <vm/vm_extern.h> 517 #include <vm/vm_kern.h> 518 519 static int 520 mdstart_swap(struct md_s *sc, struct bio *bp) 521 { 522 { 523 int i, o, rv; 524 vm_page_t m; 525 u_char *p; 526 vm_offset_t kva; 527 528 p = bp->bio_data; 529 o = bp->bio_offset / sc->secsize; 530 mtx_lock(&Giant); 531 kva = kmem_alloc_nofault(kernel_map, sc->secsize); 532 533 VM_OBJECT_LOCK(sc->object); 534 vm_object_pip_add(sc->object, 1); 535 for (i = 0; i < bp->bio_length / sc->secsize; i++) { 536 m = vm_page_grab(sc->object, i + o, 537 VM_ALLOC_NORMAL|VM_ALLOC_RETRY); 538 pmap_qenter(kva, &m, 1); 539 if (bp->bio_cmd == BIO_READ) { 540 if (m->valid != VM_PAGE_BITS_ALL) { 541 rv = vm_pager_get_pages(sc->object, 542 &m, 1, 0); 543 } 544 bcopy((void *)kva, p, sc->secsize); 545 } else if (bp->bio_cmd == BIO_WRITE) { 546 bcopy(p, (void *)kva, sc->secsize); 547 m->valid = VM_PAGE_BITS_ALL; 548 #if 0 549 } else if (bp->bio_cmd == BIO_DELETE) { 550 bzero((void *)kva, sc->secsize); 551 vm_page_dirty(m); 552 m->valid = VM_PAGE_BITS_ALL; 553 #endif 554 } 555 pmap_qremove(kva, 1); 556 vm_page_lock_queues(); 557 vm_page_wakeup(m); 558 vm_page_activate(m); 559 if (bp->bio_cmd == BIO_WRITE) { 560 vm_page_dirty(m); 561 } 562 vm_page_unlock_queues(); 563 p += sc->secsize; 564 #if 0 565 if (bootverbose || o < 17) 566 printf("wire_count %d busy %d flags %x hold_count %d act_count %d queue %d valid %d dirty %d @ %d\n", 567 m->wire_count, m->busy, 568 m->flags, m->hold_count, m->act_count, m->queue, m->valid, m->dirty, o + i); 569 #endif 570 } 571 vm_object_pip_subtract(sc->object, 1); 572 vm_object_set_writeable_dirty(sc->object); 573 VM_OBJECT_UNLOCK(sc->object); 574 kmem_free(kernel_map, kva, sc->secsize); 575 mtx_unlock(&Giant); 576 return (0); 577 } 578 } 579 580 static void 581 md_kthread(void *arg) 582 { 583 struct md_s *sc; 584 struct bio *bp; 585 int error, hasgiant; 586 587 sc = arg; 588 curthread->td_base_pri = PRIBIO; 589 590 switch (sc->type) { 591 case MD_SWAP: 592 case MD_VNODE: 593 mtx_lock(&Giant); 594 hasgiant = 1; 595 break; 596 case MD_MALLOC: 597 case MD_PRELOAD: 598 default: 599 hasgiant = 0; 600 break; 601 } 602 603 for (;;) { 604 mtx_lock(&sc->queue_mtx); 605 bp = bioq_first(&sc->bio_queue); 606 if (bp) 607 bioq_remove(&sc->bio_queue, bp); 608 if (!bp) { 609 if (sc->flags & MD_SHUTDOWN) { 610 mtx_unlock(&sc->queue_mtx); 611 sc->procp = NULL; 612 wakeup(&sc->procp); 613 if (!hasgiant) 614 mtx_lock(&Giant); 615 kthread_exit(0); 616 } 617 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 618 continue; 619 } 620 mtx_unlock(&sc->queue_mtx); 621 if (bp->bio_cmd == BIO_GETATTR) { 622 if (sc->fwsectors && sc->fwheads && 623 (g_handleattr_int(bp, "GEOM::fwsectors", 624 sc->fwsectors) || 625 g_handleattr_int(bp, "GEOM::fwheads", 626 sc->fwheads))) 627 error = -1; 628 else 629 error = EOPNOTSUPP; 630 } else { 631 switch (sc->type) { 632 case MD_MALLOC: 633 error = mdstart_malloc(sc, bp); 634 break; 635 case MD_PRELOAD: 636 error = mdstart_preload(sc, bp); 637 break; 638 case MD_VNODE: 639 error = mdstart_vnode(sc, bp); 640 break; 641 case MD_SWAP: 642 error = mdstart_swap(sc, bp); 643 break; 644 default: 645 panic("Impossible md(type)"); 646 break; 647 } 648 } 649 650 if (error != -1) { 651 bp->bio_completed = bp->bio_length; 652 g_io_deliver(bp, error); 653 } 654 } 655 } 656 657 static struct md_s * 658 mdfind(int unit) 659 { 660 struct md_s *sc; 661 662 /* XXX: LOCK(unique unit numbers) */ 663 LIST_FOREACH(sc, &md_softc_list, list) { 664 if (sc->unit == unit) 665 break; 666 } 667 /* XXX: UNLOCK(unique unit numbers) */ 668 return (sc); 669 } 670 671 static struct md_s * 672 mdnew(int unit) 673 { 674 struct md_s *sc; 675 int error, max = -1; 676 677 /* XXX: LOCK(unique unit numbers) */ 678 LIST_FOREACH(sc, &md_softc_list, list) { 679 if (sc->unit == unit) { 680 /* XXX: UNLOCK(unique unit numbers) */ 681 return (NULL); 682 } 683 if (sc->unit > max) 684 max = sc->unit; 685 } 686 if (unit == -1) 687 unit = max + 1; 688 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 689 sc->unit = unit; 690 bioq_init(&sc->bio_queue); 691 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 692 sprintf(sc->name, "md%d", unit); 693 error = kthread_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 694 if (error) { 695 free(sc, M_MD); 696 return (NULL); 697 } 698 LIST_INSERT_HEAD(&md_softc_list, sc, list); 699 /* XXX: UNLOCK(unique unit numbers) */ 700 return (sc); 701 } 702 703 static void 704 mdinit(struct md_s *sc) 705 { 706 707 struct g_geom *gp; 708 struct g_provider *pp; 709 710 DROP_GIANT(); 711 g_topology_lock(); 712 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 713 gp->start = g_md_start; 714 gp->access = g_md_access; 715 gp->softc = sc; 716 pp = g_new_providerf(gp, "md%d", sc->unit); 717 pp->mediasize = (off_t)sc->nsect * sc->secsize; 718 pp->sectorsize = sc->secsize; 719 sc->gp = gp; 720 sc->pp = pp; 721 g_error_provider(pp, 0); 722 g_topology_unlock(); 723 PICKUP_GIANT(); 724 } 725 726 /* 727 * XXX: we should check that the range they feed us is mapped. 728 * XXX: we should implement read-only. 729 */ 730 731 static int 732 mdcreate_preload(struct md_ioctl *mdio) 733 { 734 struct md_s *sc; 735 736 if (mdio->md_size == 0) 737 return (EINVAL); 738 if (mdio->md_options & ~(MD_AUTOUNIT)) 739 return (EINVAL); 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_PRELOAD; 751 sc->secsize = DEV_BSIZE; 752 sc->nsect = mdio->md_size; 753 sc->flags = mdio->md_options & MD_FORCE; 754 /* Cast to pointer size, then to pointer to avoid warning */ 755 sc->pl_ptr = (u_char *)(uintptr_t)mdio->md_base; 756 sc->pl_len = (mdio->md_size << DEV_BSHIFT); 757 mdinit(sc); 758 return (0); 759 } 760 761 762 static int 763 mdcreate_malloc(struct md_ioctl *mdio) 764 { 765 struct md_s *sc; 766 off_t u; 767 uintptr_t sp; 768 int error; 769 770 error = 0; 771 if (mdio->md_size == 0) 772 return (EINVAL); 773 if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 774 return (EINVAL); 775 if (mdio->md_secsize != 0 && !powerof2(mdio->md_secsize)) 776 return (EINVAL); 777 /* Compression doesn't make sense if we have reserved space */ 778 if (mdio->md_options & MD_RESERVE) 779 mdio->md_options &= ~MD_COMPRESS; 780 if (mdio->md_options & MD_AUTOUNIT) { 781 sc = mdnew(-1); 782 if (sc == NULL) 783 return (ENOMEM); 784 mdio->md_unit = sc->unit; 785 } else { 786 sc = mdnew(mdio->md_unit); 787 if (sc == NULL) 788 return (EBUSY); 789 } 790 sc->type = MD_MALLOC; 791 if (mdio->md_secsize != 0) 792 sc->secsize = mdio->md_secsize; 793 else 794 sc->secsize = DEV_BSIZE; 795 if (mdio->md_fwsectors != 0) 796 sc->fwsectors = mdio->md_fwsectors; 797 if (mdio->md_fwheads != 0) 798 sc->fwheads = mdio->md_fwheads; 799 sc->nsect = mdio->md_size; 800 sc->nsect /= (sc->secsize / DEV_BSIZE); 801 sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE); 802 sc->indir = dimension(sc->nsect); 803 sc->uma = uma_zcreate(sc->name, sc->secsize, 804 NULL, NULL, NULL, NULL, 0x1ff, 0); 805 if (mdio->md_options & MD_RESERVE) { 806 for (u = 0; u < sc->nsect; u++) { 807 sp = (uintptr_t) uma_zalloc(sc->uma, M_NOWAIT | M_ZERO); 808 if (sp != 0) 809 error = s_write(sc->indir, u, sp); 810 else 811 error = ENOMEM; 812 if (error) 813 break; 814 } 815 } 816 if (error) { 817 mddestroy(sc, NULL); 818 return (error); 819 } 820 mdinit(sc); 821 if (!(mdio->md_options & MD_RESERVE)) 822 sc->pp->flags |= G_PF_CANDELETE; 823 return (0); 824 } 825 826 827 static int 828 mdsetcred(struct md_s *sc, struct ucred *cred) 829 { 830 char *tmpbuf; 831 int error = 0; 832 833 /* 834 * Set credits in our softc 835 */ 836 837 if (sc->cred) 838 crfree(sc->cred); 839 sc->cred = crhold(cred); 840 841 /* 842 * Horrible kludge to establish credentials for NFS XXX. 843 */ 844 845 if (sc->vnode) { 846 struct uio auio; 847 struct iovec aiov; 848 849 tmpbuf = malloc(sc->secsize, M_TEMP, M_WAITOK); 850 bzero(&auio, sizeof(auio)); 851 852 aiov.iov_base = tmpbuf; 853 aiov.iov_len = sc->secsize; 854 auio.uio_iov = &aiov; 855 auio.uio_iovcnt = 1; 856 auio.uio_offset = 0; 857 auio.uio_rw = UIO_READ; 858 auio.uio_segflg = UIO_SYSSPACE; 859 auio.uio_resid = aiov.iov_len; 860 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 861 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 862 VOP_UNLOCK(sc->vnode, 0, curthread); 863 free(tmpbuf, M_TEMP); 864 } 865 return (error); 866 } 867 868 static int 869 mdcreate_vnode(struct md_ioctl *mdio, struct thread *td) 870 { 871 struct md_s *sc; 872 struct vattr vattr; 873 struct nameidata nd; 874 int error, flags; 875 876 flags = FREAD|FWRITE; 877 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 878 error = vn_open(&nd, &flags, 0, -1); 879 if (error) { 880 if (error != EACCES && error != EPERM && error != EROFS) 881 return (error); 882 flags &= ~FWRITE; 883 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 884 error = vn_open(&nd, &flags, 0, -1); 885 if (error) 886 return (error); 887 } 888 NDFREE(&nd, NDF_ONLY_PNBUF); 889 if (nd.ni_vp->v_type != VREG || 890 (error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred, td))) { 891 VOP_UNLOCK(nd.ni_vp, 0, td); 892 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 893 return (error ? error : EINVAL); 894 } 895 VOP_UNLOCK(nd.ni_vp, 0, td); 896 897 if (mdio->md_options & MD_AUTOUNIT) { 898 sc = mdnew(-1); 899 mdio->md_unit = sc->unit; 900 } else { 901 sc = mdnew(mdio->md_unit); 902 } 903 if (sc == NULL) { 904 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 905 return (EBUSY); 906 } 907 908 if (mdio->md_fwsectors != 0) 909 sc->fwsectors = mdio->md_fwsectors; 910 if (mdio->md_fwheads != 0) 911 sc->fwheads = mdio->md_fwheads; 912 sc->type = MD_VNODE; 913 sc->flags = mdio->md_options & MD_FORCE; 914 if (!(flags & FWRITE)) 915 sc->flags |= MD_READONLY; 916 sc->secsize = DEV_BSIZE; 917 sc->vnode = nd.ni_vp; 918 919 /* 920 * If the size is specified, override the file attributes. 921 */ 922 if (mdio->md_size) 923 sc->nsect = mdio->md_size; 924 else 925 sc->nsect = vattr.va_size / sc->secsize; /* XXX: round up ? */ 926 if (sc->nsect == 0) { 927 mddestroy(sc, td); 928 return (EINVAL); 929 } 930 error = mdsetcred(sc, td->td_ucred); 931 if (error) { 932 mddestroy(sc, td); 933 return (error); 934 } 935 mdinit(sc); 936 return (0); 937 } 938 939 static void 940 md_zapit(void *p, int cancel) 941 { 942 if (cancel) 943 return; 944 g_wither_geom(p, ENXIO); 945 } 946 947 static int 948 mddestroy(struct md_s *sc, struct thread *td) 949 { 950 951 GIANT_REQUIRED; 952 953 mtx_destroy(&sc->queue_mtx); 954 if (sc->gp) { 955 sc->gp->softc = NULL; 956 g_waitfor_event(md_zapit, sc->gp, M_WAITOK, sc->gp, NULL); 957 sc->gp = NULL; 958 sc->pp = NULL; 959 } 960 sc->flags |= MD_SHUTDOWN; 961 wakeup(sc); 962 while (sc->procp != NULL) 963 tsleep(&sc->procp, PRIBIO, "mddestroy", hz / 10); 964 if (sc->vnode != NULL) 965 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 966 FREAD : (FREAD|FWRITE), sc->cred, td); 967 if (sc->cred != NULL) 968 crfree(sc->cred); 969 if (sc->object != NULL) { 970 vm_object_deallocate(sc->object); 971 } 972 if (sc->indir) 973 destroy_indir(sc, sc->indir); 974 if (sc->uma) 975 uma_zdestroy(sc->uma); 976 977 /* XXX: LOCK(unique unit numbers) */ 978 LIST_REMOVE(sc, list); 979 /* XXX: UNLOCK(unique unit numbers) */ 980 free(sc, M_MD); 981 return (0); 982 } 983 984 static int 985 mdcreate_swap(struct md_ioctl *mdio, struct thread *td) 986 { 987 int error; 988 struct md_s *sc; 989 990 GIANT_REQUIRED; 991 992 if (mdio->md_options & MD_AUTOUNIT) { 993 sc = mdnew(-1); 994 mdio->md_unit = sc->unit; 995 } else { 996 sc = mdnew(mdio->md_unit); 997 } 998 if (sc == NULL) 999 return (EBUSY); 1000 1001 sc->type = MD_SWAP; 1002 1003 /* 1004 * Range check. Disallow negative sizes or any size less then the 1005 * size of a page. Then round to a page. 1006 */ 1007 1008 if (mdio->md_size == 0) { 1009 mddestroy(sc, td); 1010 return (EDOM); 1011 } 1012 1013 /* 1014 * Allocate an OBJT_SWAP object. 1015 * 1016 * sc_secsize is PAGE_SIZE'd 1017 * 1018 * mdio->size is in DEV_BSIZE'd chunks. 1019 * Note the truncation. 1020 */ 1021 1022 sc->secsize = PAGE_SIZE; 1023 sc->nsect = mdio->md_size / (PAGE_SIZE / DEV_BSIZE); 1024 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, sc->secsize * (vm_offset_t)sc->nsect, VM_PROT_DEFAULT, 0); 1025 sc->flags = mdio->md_options & MD_FORCE; 1026 if (mdio->md_options & MD_RESERVE) { 1027 if (swap_pager_reserve(sc->object, 0, sc->nsect) < 0) { 1028 vm_object_deallocate(sc->object); 1029 sc->object = NULL; 1030 mddestroy(sc, td); 1031 return (EDOM); 1032 } 1033 } 1034 error = mdsetcred(sc, td->td_ucred); 1035 if (error) { 1036 mddestroy(sc, td); 1037 return (error); 1038 } 1039 mdinit(sc); 1040 if (!(mdio->md_options & MD_RESERVE)) 1041 sc->pp->flags |= G_PF_CANDELETE; 1042 return (0); 1043 } 1044 1045 static int 1046 mddetach(int unit, struct thread *td) 1047 { 1048 struct md_s *sc; 1049 1050 sc = mdfind(unit); 1051 if (sc == NULL) 1052 return (ENOENT); 1053 if (sc->opencount != 0 && !(sc->flags & MD_FORCE)) 1054 return (EBUSY); 1055 switch(sc->type) { 1056 case MD_VNODE: 1057 case MD_SWAP: 1058 case MD_MALLOC: 1059 case MD_PRELOAD: 1060 return (mddestroy(sc, td)); 1061 default: 1062 return (EOPNOTSUPP); 1063 } 1064 } 1065 1066 static int 1067 mdctlioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 1068 { 1069 struct md_ioctl *mdio; 1070 struct md_s *sc; 1071 int i; 1072 1073 if (md_debug) 1074 printf("mdctlioctl(%s %lx %p %x %p)\n", 1075 devtoname(dev), cmd, addr, flags, td); 1076 1077 /* 1078 * We assert the version number in the individual ioctl 1079 * handlers instead of out here because (a) it is possible we 1080 * may add another ioctl in the future which doesn't read an 1081 * mdio, and (b) the correct return value for an unknown ioctl 1082 * is ENOIOCTL, not EINVAL. 1083 */ 1084 mdio = (struct md_ioctl *)addr; 1085 switch (cmd) { 1086 case MDIOCATTACH: 1087 if (mdio->md_version != MDIOVERSION) 1088 return (EINVAL); 1089 switch (mdio->md_type) { 1090 case MD_MALLOC: 1091 return (mdcreate_malloc(mdio)); 1092 case MD_PRELOAD: 1093 return (mdcreate_preload(mdio)); 1094 case MD_VNODE: 1095 return (mdcreate_vnode(mdio, td)); 1096 case MD_SWAP: 1097 return (mdcreate_swap(mdio, td)); 1098 default: 1099 return (EINVAL); 1100 } 1101 case MDIOCDETACH: 1102 if (mdio->md_version != MDIOVERSION) 1103 return (EINVAL); 1104 if (mdio->md_file != NULL || mdio->md_size != 0 || 1105 mdio->md_options != 0) 1106 return (EINVAL); 1107 return (mddetach(mdio->md_unit, td)); 1108 case MDIOCQUERY: 1109 if (mdio->md_version != MDIOVERSION) 1110 return (EINVAL); 1111 sc = mdfind(mdio->md_unit); 1112 if (sc == NULL) 1113 return (ENOENT); 1114 mdio->md_type = sc->type; 1115 mdio->md_options = sc->flags; 1116 switch (sc->type) { 1117 case MD_MALLOC: 1118 mdio->md_size = sc->nsect; 1119 break; 1120 case MD_PRELOAD: 1121 mdio->md_size = sc->nsect; 1122 mdio->md_base = (uint64_t)(intptr_t)sc->pl_ptr; 1123 break; 1124 case MD_SWAP: 1125 mdio->md_size = sc->nsect * (PAGE_SIZE / DEV_BSIZE); 1126 break; 1127 case MD_VNODE: 1128 mdio->md_size = sc->nsect; 1129 /* XXX fill this in */ 1130 mdio->md_file = NULL; 1131 break; 1132 } 1133 return (0); 1134 case MDIOCLIST: 1135 i = 1; 1136 LIST_FOREACH(sc, &md_softc_list, list) { 1137 if (i == MDNPAD - 1) 1138 mdio->md_pad[i] = -1; 1139 else 1140 mdio->md_pad[i++] = sc->unit; 1141 } 1142 mdio->md_pad[0] = i - 1; 1143 return (0); 1144 default: 1145 return (ENOIOCTL); 1146 }; 1147 return (ENOIOCTL); 1148 } 1149 1150 static void 1151 md_preloaded(u_char *image, unsigned length) 1152 { 1153 struct md_s *sc; 1154 1155 sc = mdnew(-1); 1156 if (sc == NULL) 1157 return; 1158 sc->type = MD_PRELOAD; 1159 sc->secsize = DEV_BSIZE; 1160 sc->nsect = length / DEV_BSIZE; 1161 sc->pl_ptr = image; 1162 sc->pl_len = length; 1163 if (sc->unit == 0) 1164 mdrootready = 1; 1165 mdinit(sc); 1166 } 1167 1168 static void 1169 md_drvinit(struct g_class *mp __unused) 1170 { 1171 1172 caddr_t mod; 1173 caddr_t c; 1174 u_char *ptr, *name, *type; 1175 unsigned len; 1176 1177 mod = NULL; 1178 g_topology_unlock(); 1179 #ifdef MD_ROOT_SIZE 1180 md_preloaded(mfs_root, MD_ROOT_SIZE*1024); 1181 #endif 1182 while ((mod = preload_search_next_name(mod)) != NULL) { 1183 name = (char *)preload_search_info(mod, MODINFO_NAME); 1184 type = (char *)preload_search_info(mod, MODINFO_TYPE); 1185 if (name == NULL) 1186 continue; 1187 if (type == NULL) 1188 continue; 1189 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 1190 continue; 1191 c = preload_search_info(mod, MODINFO_ADDR); 1192 ptr = *(u_char **)c; 1193 c = preload_search_info(mod, MODINFO_SIZE); 1194 len = *(size_t *)c; 1195 printf("%s%d: Preloaded image <%s> %d bytes at %p\n", 1196 MD_NAME, mdunits, name, len, ptr); 1197 md_preloaded(ptr, len); 1198 } 1199 status_dev = make_dev(&mdctl_cdevsw, 0xffff00ff, UID_ROOT, GID_WHEEL, 1200 0600, MDCTL_NAME); 1201 g_topology_lock(); 1202 } 1203 1204 static int 1205 md_modevent(module_t mod, int type, void *data) 1206 { 1207 int error; 1208 struct md_s *sc; 1209 1210 switch (type) { 1211 case MOD_LOAD: 1212 break; 1213 case MOD_UNLOAD: 1214 LIST_FOREACH(sc, &md_softc_list, list) { 1215 error = mddetach(sc->unit, curthread); 1216 if (error != 0) 1217 return (error); 1218 } 1219 if (status_dev) 1220 destroy_dev(status_dev); 1221 status_dev = 0; 1222 break; 1223 default: 1224 break; 1225 } 1226 return (0); 1227 } 1228 1229 static moduledata_t md_mod = { 1230 MD_NAME, 1231 md_modevent, 1232 NULL 1233 }; 1234 DECLARE_MODULE(md, md_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE); 1235 MODULE_VERSION(md, MD_MODVER); 1236 1237 1238 #ifdef MD_ROOT 1239 static void 1240 md_takeroot(void *junk) 1241 { 1242 if (mdrootready) 1243 rootdevnames[0] = "ufs:/dev/md0"; 1244 } 1245 1246 SYSINIT(md_root, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, md_takeroot, NULL); 1247 #endif /* MD_ROOT */ 1248