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_ioctl = mdctlioctl, 120 .d_name = MD_NAME, 121 .d_maj = CDEV_MAJOR 122 }; 123 124 125 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(&md_softc_list); 126 127 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 128 #define NMASK (NINDIR-1) 129 static int nshift; 130 131 struct indir { 132 uintptr_t *array; 133 u_int total; 134 u_int used; 135 u_int shift; 136 }; 137 138 struct md_s { 139 int unit; 140 LIST_ENTRY(md_s) list; 141 struct bio_queue_head bio_queue; 142 struct mtx queue_mtx; 143 dev_t dev; 144 enum md_types type; 145 unsigned nsect; 146 unsigned opencount; 147 unsigned secsize; 148 unsigned fwheads; 149 unsigned fwsectors; 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(u_int 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 }; 343 344 static int 345 g_md_access(struct g_provider *pp, int r, int w, int e) 346 { 347 struct md_s *sc; 348 349 sc = pp->geom->softc; 350 if (sc == NULL) 351 return (ENXIO); 352 r += pp->acr; 353 w += pp->acw; 354 e += pp->ace; 355 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 356 sc->opencount = 1; 357 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 358 sc->opencount = 0; 359 } 360 return (0); 361 } 362 363 static void 364 g_md_start(struct bio *bp) 365 { 366 struct md_s *sc; 367 368 sc = bp->bio_to->geom->softc; 369 370 bp->bio_blkno = bp->bio_offset >> DEV_BSHIFT; 371 bp->bio_pblkno = bp->bio_offset / sc->secsize; 372 bp->bio_bcount = bp->bio_length; 373 mtx_lock(&sc->queue_mtx); 374 bioq_disksort(&sc->bio_queue, bp); 375 mtx_unlock(&sc->queue_mtx); 376 377 wakeup(sc); 378 } 379 380 DECLARE_GEOM_CLASS(g_md_class, g_md); 381 382 383 static int 384 mdstart_malloc(struct md_s *sc, struct bio *bp) 385 { 386 int i, error; 387 u_char *dst; 388 unsigned secno, nsec, uc; 389 uintptr_t sp, osp; 390 391 nsec = bp->bio_bcount / sc->secsize; 392 secno = bp->bio_pblkno; 393 dst = bp->bio_data; 394 error = 0; 395 while (nsec--) { 396 osp = s_read(sc->indir, secno); 397 if (bp->bio_cmd == BIO_DELETE) { 398 if (osp != 0) 399 error = s_write(sc->indir, secno, 0); 400 } else if (bp->bio_cmd == BIO_READ) { 401 if (osp == 0) 402 bzero(dst, sc->secsize); 403 else if (osp <= 255) 404 for (i = 0; i < sc->secsize; i++) 405 dst[i] = osp; 406 else 407 bcopy((void *)osp, dst, sc->secsize); 408 osp = 0; 409 } else if (bp->bio_cmd == BIO_WRITE) { 410 if (sc->flags & MD_COMPRESS) { 411 uc = dst[0]; 412 for (i = 1; i < sc->secsize; i++) 413 if (dst[i] != uc) 414 break; 415 } else { 416 i = 0; 417 uc = 0; 418 } 419 if (i == sc->secsize) { 420 if (osp != uc) 421 error = s_write(sc->indir, secno, uc); 422 } else { 423 if (osp <= 255) { 424 sp = (uintptr_t) uma_zalloc( 425 sc->uma, M_NOWAIT); 426 if (sp == 0) { 427 error = ENOSPC; 428 break; 429 } 430 bcopy(dst, (void *)sp, sc->secsize); 431 error = s_write(sc->indir, secno, sp); 432 } else { 433 bcopy(dst, (void *)osp, sc->secsize); 434 osp = 0; 435 } 436 } 437 } else { 438 error = EOPNOTSUPP; 439 } 440 if (osp > 255) 441 uma_zfree(sc->uma, (void*)osp); 442 if (error) 443 break; 444 secno++; 445 dst += sc->secsize; 446 } 447 bp->bio_resid = 0; 448 return (error); 449 } 450 451 static int 452 mdstart_preload(struct md_s *sc, struct bio *bp) 453 { 454 455 if (bp->bio_cmd == BIO_DELETE) { 456 } else if (bp->bio_cmd == BIO_READ) { 457 bcopy(sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_data, bp->bio_bcount); 458 } else { 459 bcopy(bp->bio_data, sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_bcount); 460 } 461 bp->bio_resid = 0; 462 return (0); 463 } 464 465 static int 466 mdstart_vnode(struct md_s *sc, struct bio *bp) 467 { 468 int error; 469 struct uio auio; 470 struct iovec aiov; 471 struct mount *mp; 472 473 /* 474 * VNODE I/O 475 * 476 * If an error occurs, we set BIO_ERROR but we do not set 477 * B_INVAL because (for a write anyway), the buffer is 478 * still valid. 479 */ 480 481 bzero(&auio, sizeof(auio)); 482 483 aiov.iov_base = bp->bio_data; 484 aiov.iov_len = bp->bio_bcount; 485 auio.uio_iov = &aiov; 486 auio.uio_iovcnt = 1; 487 auio.uio_offset = (vm_ooffset_t)bp->bio_pblkno * sc->secsize; 488 auio.uio_segflg = UIO_SYSSPACE; 489 if(bp->bio_cmd == BIO_READ) 490 auio.uio_rw = UIO_READ; 491 else if(bp->bio_cmd == BIO_WRITE) 492 auio.uio_rw = UIO_WRITE; 493 else 494 panic("wrong BIO_OP in mdstart_vnode"); 495 auio.uio_resid = bp->bio_bcount; 496 auio.uio_td = curthread; 497 /* 498 * When reading set IO_DIRECT to try to avoid double-caching 499 * the data. When writing IO_DIRECT is not optimal. 500 */ 501 if (bp->bio_cmd == BIO_READ) { 502 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 503 error = VOP_READ(sc->vnode, &auio, IO_DIRECT, sc->cred); 504 } else { 505 (void) vn_start_write(sc->vnode, &mp, V_WAIT); 506 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 507 error = VOP_WRITE(sc->vnode, &auio, 0, sc->cred); 508 vn_finished_write(mp); 509 } 510 VOP_UNLOCK(sc->vnode, 0, curthread); 511 bp->bio_resid = auio.uio_resid; 512 return (error); 513 } 514 515 #include <vm/vm_extern.h> 516 #include <vm/vm_kern.h> 517 518 static int 519 mdstart_swap(struct md_s *sc, struct bio *bp) 520 { 521 { 522 int i, o, rv; 523 vm_page_t m; 524 u_char *p; 525 vm_offset_t kva; 526 527 p = bp->bio_data; 528 o = bp->bio_offset / sc->secsize; 529 mtx_lock(&Giant); 530 kva = kmem_alloc_nofault(kernel_map, sc->secsize); 531 532 VM_OBJECT_LOCK(sc->object); 533 vm_object_pip_add(sc->object, 1); 534 for (i = 0; i < bp->bio_length / sc->secsize; i++) { 535 m = vm_page_grab(sc->object, i + o, 536 VM_ALLOC_NORMAL|VM_ALLOC_RETRY); 537 pmap_qenter(kva, &m, 1); 538 if (bp->bio_cmd == BIO_READ) { 539 if (m->valid != VM_PAGE_BITS_ALL) { 540 rv = vm_pager_get_pages(sc->object, 541 &m, 1, 0); 542 } 543 bcopy((void *)kva, p, sc->secsize); 544 } else if (bp->bio_cmd == BIO_WRITE) { 545 bcopy(p, (void *)kva, sc->secsize); 546 m->valid = VM_PAGE_BITS_ALL; 547 #if 0 548 } else if (bp->bio_cmd == BIO_DELETE) { 549 bzero((void *)kva, sc->secsize); 550 vm_page_dirty(m); 551 m->valid = VM_PAGE_BITS_ALL; 552 #endif 553 } 554 pmap_qremove(kva, 1); 555 vm_page_lock_queues(); 556 vm_page_wakeup(m); 557 vm_page_activate(m); 558 if (bp->bio_cmd == BIO_WRITE) { 559 vm_page_dirty(m); 560 } 561 vm_page_unlock_queues(); 562 p += sc->secsize; 563 #if 0 564 if (bootverbose || o < 17) 565 printf("wire_count %d busy %d flags %x hold_count %d act_count %d queue %d valid %d dirty %d @ %d\n", 566 m->wire_count, m->busy, 567 m->flags, m->hold_count, m->act_count, m->queue, m->valid, m->dirty, o + i); 568 #endif 569 } 570 vm_object_pip_subtract(sc->object, 1); 571 vm_object_set_writeable_dirty(sc->object); 572 VM_OBJECT_UNLOCK(sc->object); 573 kmem_free(kernel_map, kva, sc->secsize); 574 mtx_unlock(&Giant); 575 return (0); 576 } 577 } 578 579 static void 580 md_kthread(void *arg) 581 { 582 struct md_s *sc; 583 struct bio *bp; 584 int error, hasgiant; 585 586 sc = arg; 587 curthread->td_base_pri = PRIBIO; 588 589 switch (sc->type) { 590 case MD_SWAP: 591 case MD_VNODE: 592 mtx_lock(&Giant); 593 hasgiant = 1; 594 break; 595 case MD_MALLOC: 596 case MD_PRELOAD: 597 default: 598 hasgiant = 0; 599 break; 600 } 601 602 for (;;) { 603 mtx_lock(&sc->queue_mtx); 604 bp = bioq_first(&sc->bio_queue); 605 if (bp) 606 bioq_remove(&sc->bio_queue, bp); 607 if (!bp) { 608 if (sc->flags & MD_SHUTDOWN) { 609 mtx_unlock(&sc->queue_mtx); 610 sc->procp = NULL; 611 wakeup(&sc->procp); 612 if (!hasgiant) 613 mtx_lock(&Giant); 614 kthread_exit(0); 615 } 616 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 617 continue; 618 } 619 mtx_unlock(&sc->queue_mtx); 620 if (bp->bio_cmd == BIO_GETATTR) { 621 if (sc->fwsectors && sc->fwheads && 622 (g_handleattr_int(bp, "GEOM::fwsectors", 623 sc->fwsectors) || 624 g_handleattr_int(bp, "GEOM::fwheads", 625 sc->fwheads))) 626 error = -1; 627 else 628 error = EOPNOTSUPP; 629 } else { 630 switch (sc->type) { 631 case MD_MALLOC: 632 error = mdstart_malloc(sc, bp); 633 break; 634 case MD_PRELOAD: 635 error = mdstart_preload(sc, bp); 636 break; 637 case MD_VNODE: 638 error = mdstart_vnode(sc, bp); 639 break; 640 case MD_SWAP: 641 error = mdstart_swap(sc, bp); 642 break; 643 default: 644 panic("Impossible md(type)"); 645 break; 646 } 647 } 648 649 if (error != -1) { 650 bp->bio_completed = bp->bio_length; 651 g_io_deliver(bp, error); 652 } 653 } 654 } 655 656 static struct md_s * 657 mdfind(int unit) 658 { 659 struct md_s *sc; 660 661 /* XXX: LOCK(unique unit numbers) */ 662 LIST_FOREACH(sc, &md_softc_list, list) { 663 if (sc->unit == unit) 664 break; 665 } 666 /* XXX: UNLOCK(unique unit numbers) */ 667 return (sc); 668 } 669 670 static struct md_s * 671 mdnew(int unit) 672 { 673 struct md_s *sc; 674 int error, max = -1; 675 676 /* XXX: LOCK(unique unit numbers) */ 677 LIST_FOREACH(sc, &md_softc_list, list) { 678 if (sc->unit == unit) { 679 /* XXX: UNLOCK(unique unit numbers) */ 680 return (NULL); 681 } 682 if (sc->unit > max) 683 max = sc->unit; 684 } 685 if (unit == -1) 686 unit = max + 1; 687 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 688 sc->unit = unit; 689 bioq_init(&sc->bio_queue); 690 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 691 sprintf(sc->name, "md%d", unit); 692 error = kthread_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 693 if (error) { 694 free(sc, M_MD); 695 return (NULL); 696 } 697 LIST_INSERT_HEAD(&md_softc_list, sc, list); 698 /* XXX: UNLOCK(unique unit numbers) */ 699 return (sc); 700 } 701 702 static void 703 mdinit(struct md_s *sc) 704 { 705 706 struct g_geom *gp; 707 struct g_provider *pp; 708 709 DROP_GIANT(); 710 g_topology_lock(); 711 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 712 gp->start = g_md_start; 713 gp->access = g_md_access; 714 gp->softc = sc; 715 pp = g_new_providerf(gp, "md%d", sc->unit); 716 pp->mediasize = (off_t)sc->nsect * sc->secsize; 717 pp->sectorsize = sc->secsize; 718 sc->gp = gp; 719 sc->pp = pp; 720 g_error_provider(pp, 0); 721 g_topology_unlock(); 722 PICKUP_GIANT(); 723 } 724 725 /* 726 * XXX: we should check that the range they feed us is mapped. 727 * XXX: we should implement read-only. 728 */ 729 730 static int 731 mdcreate_preload(struct md_ioctl *mdio) 732 { 733 struct md_s *sc; 734 735 if (mdio->md_size == 0) 736 return (EINVAL); 737 if (mdio->md_options & ~(MD_AUTOUNIT)) 738 return (EINVAL); 739 if (mdio->md_options & MD_AUTOUNIT) { 740 sc = mdnew(-1); 741 if (sc == NULL) 742 return (ENOMEM); 743 mdio->md_unit = sc->unit; 744 } else { 745 sc = mdnew(mdio->md_unit); 746 if (sc == NULL) 747 return (EBUSY); 748 } 749 sc->type = MD_PRELOAD; 750 sc->secsize = DEV_BSIZE; 751 sc->nsect = mdio->md_size; 752 sc->flags = mdio->md_options & MD_FORCE; 753 /* Cast to pointer size, then to pointer to avoid warning */ 754 sc->pl_ptr = (u_char *)(uintptr_t)mdio->md_base; 755 sc->pl_len = (mdio->md_size << DEV_BSHIFT); 756 mdinit(sc); 757 return (0); 758 } 759 760 761 static int 762 mdcreate_malloc(struct md_ioctl *mdio) 763 { 764 struct md_s *sc; 765 off_t u; 766 uintptr_t sp; 767 int error; 768 769 error = 0; 770 if (mdio->md_size == 0) 771 return (EINVAL); 772 if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 773 return (EINVAL); 774 if (mdio->md_secsize != 0 && !powerof2(mdio->md_secsize)) 775 return (EINVAL); 776 /* Compression doesn't make sense if we have reserved space */ 777 if (mdio->md_options & MD_RESERVE) 778 mdio->md_options &= ~MD_COMPRESS; 779 if (mdio->md_options & MD_AUTOUNIT) { 780 sc = mdnew(-1); 781 if (sc == NULL) 782 return (ENOMEM); 783 mdio->md_unit = sc->unit; 784 } else { 785 sc = mdnew(mdio->md_unit); 786 if (sc == NULL) 787 return (EBUSY); 788 } 789 sc->type = MD_MALLOC; 790 if (mdio->md_secsize != 0) 791 sc->secsize = mdio->md_secsize; 792 else 793 sc->secsize = DEV_BSIZE; 794 if (mdio->md_fwsectors != 0) 795 sc->fwsectors = mdio->md_fwsectors; 796 if (mdio->md_fwheads != 0) 797 sc->fwheads = mdio->md_fwheads; 798 sc->nsect = mdio->md_size; 799 sc->nsect /= (sc->secsize / DEV_BSIZE); 800 sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE); 801 sc->indir = dimension(sc->nsect); 802 sc->uma = uma_zcreate(sc->name, sc->secsize, 803 NULL, NULL, NULL, NULL, 0x1ff, 0); 804 if (mdio->md_options & MD_RESERVE) { 805 for (u = 0; u < sc->nsect; u++) { 806 sp = (uintptr_t) uma_zalloc(sc->uma, M_NOWAIT | M_ZERO); 807 if (sp != 0) 808 error = s_write(sc->indir, u, sp); 809 else 810 error = ENOMEM; 811 if (error) 812 break; 813 } 814 } 815 if (error) { 816 mddestroy(sc, NULL); 817 return (error); 818 } 819 mdinit(sc); 820 if (!(mdio->md_options & MD_RESERVE)) 821 sc->pp->flags |= G_PF_CANDELETE; 822 return (0); 823 } 824 825 826 static int 827 mdsetcred(struct md_s *sc, struct ucred *cred) 828 { 829 char *tmpbuf; 830 int error = 0; 831 832 /* 833 * Set credits in our softc 834 */ 835 836 if (sc->cred) 837 crfree(sc->cred); 838 sc->cred = crhold(cred); 839 840 /* 841 * Horrible kludge to establish credentials for NFS XXX. 842 */ 843 844 if (sc->vnode) { 845 struct uio auio; 846 struct iovec aiov; 847 848 tmpbuf = malloc(sc->secsize, M_TEMP, M_WAITOK); 849 bzero(&auio, sizeof(auio)); 850 851 aiov.iov_base = tmpbuf; 852 aiov.iov_len = sc->secsize; 853 auio.uio_iov = &aiov; 854 auio.uio_iovcnt = 1; 855 auio.uio_offset = 0; 856 auio.uio_rw = UIO_READ; 857 auio.uio_segflg = UIO_SYSSPACE; 858 auio.uio_resid = aiov.iov_len; 859 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 860 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 861 VOP_UNLOCK(sc->vnode, 0, curthread); 862 free(tmpbuf, M_TEMP); 863 } 864 return (error); 865 } 866 867 static int 868 mdcreate_vnode(struct md_ioctl *mdio, struct thread *td) 869 { 870 struct md_s *sc; 871 struct vattr vattr; 872 struct nameidata nd; 873 int error, flags; 874 875 flags = FREAD|FWRITE; 876 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 877 error = vn_open(&nd, &flags, 0, -1); 878 if (error) { 879 if (error != EACCES && error != EPERM && error != EROFS) 880 return (error); 881 flags &= ~FWRITE; 882 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 883 error = vn_open(&nd, &flags, 0, -1); 884 if (error) 885 return (error); 886 } 887 NDFREE(&nd, NDF_ONLY_PNBUF); 888 if (nd.ni_vp->v_type != VREG || 889 (error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred, td))) { 890 VOP_UNLOCK(nd.ni_vp, 0, td); 891 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 892 return (error ? error : EINVAL); 893 } 894 VOP_UNLOCK(nd.ni_vp, 0, td); 895 896 if (mdio->md_options & MD_AUTOUNIT) { 897 sc = mdnew(-1); 898 mdio->md_unit = sc->unit; 899 } else { 900 sc = mdnew(mdio->md_unit); 901 } 902 if (sc == NULL) { 903 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 904 return (EBUSY); 905 } 906 907 sc->type = MD_VNODE; 908 sc->flags = mdio->md_options & MD_FORCE; 909 if (!(flags & FWRITE)) 910 sc->flags |= MD_READONLY; 911 sc->secsize = DEV_BSIZE; 912 sc->vnode = nd.ni_vp; 913 914 /* 915 * If the size is specified, override the file attributes. 916 */ 917 if (mdio->md_size) 918 sc->nsect = mdio->md_size; 919 else 920 sc->nsect = vattr.va_size / sc->secsize; /* XXX: round up ? */ 921 if (sc->nsect == 0) { 922 mddestroy(sc, td); 923 return (EINVAL); 924 } 925 error = mdsetcred(sc, td->td_ucred); 926 if (error) { 927 mddestroy(sc, td); 928 return (error); 929 } 930 mdinit(sc); 931 return (0); 932 } 933 934 static void 935 md_zapit(void *p, int cancel) 936 { 937 if (cancel) 938 return; 939 g_wither_geom(p, ENXIO); 940 } 941 942 static int 943 mddestroy(struct md_s *sc, struct thread *td) 944 { 945 946 GIANT_REQUIRED; 947 948 mtx_destroy(&sc->queue_mtx); 949 if (sc->gp) { 950 sc->gp->softc = NULL; 951 g_waitfor_event(md_zapit, sc->gp, M_WAITOK, sc->gp, NULL); 952 sc->gp = NULL; 953 sc->pp = NULL; 954 } 955 sc->flags |= MD_SHUTDOWN; 956 wakeup(sc); 957 while (sc->procp != NULL) 958 tsleep(&sc->procp, PRIBIO, "mddestroy", hz / 10); 959 if (sc->vnode != NULL) 960 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 961 FREAD : (FREAD|FWRITE), sc->cred, td); 962 if (sc->cred != NULL) 963 crfree(sc->cred); 964 if (sc->object != NULL) { 965 vm_object_deallocate(sc->object); 966 } 967 if (sc->indir) 968 destroy_indir(sc, sc->indir); 969 if (sc->uma) 970 uma_zdestroy(sc->uma); 971 972 /* XXX: LOCK(unique unit numbers) */ 973 LIST_REMOVE(sc, list); 974 /* XXX: UNLOCK(unique unit numbers) */ 975 free(sc, M_MD); 976 return (0); 977 } 978 979 static int 980 mdcreate_swap(struct md_ioctl *mdio, struct thread *td) 981 { 982 int error; 983 struct md_s *sc; 984 985 GIANT_REQUIRED; 986 987 if (mdio->md_options & MD_AUTOUNIT) { 988 sc = mdnew(-1); 989 mdio->md_unit = sc->unit; 990 } else { 991 sc = mdnew(mdio->md_unit); 992 } 993 if (sc == NULL) 994 return (EBUSY); 995 996 sc->type = MD_SWAP; 997 998 /* 999 * Range check. Disallow negative sizes or any size less then the 1000 * size of a page. Then round to a page. 1001 */ 1002 1003 if (mdio->md_size == 0) { 1004 mddestroy(sc, td); 1005 return (EDOM); 1006 } 1007 1008 /* 1009 * Allocate an OBJT_SWAP object. 1010 * 1011 * sc_secsize is PAGE_SIZE'd 1012 * 1013 * mdio->size is in DEV_BSIZE'd chunks. 1014 * Note the truncation. 1015 */ 1016 1017 sc->secsize = PAGE_SIZE; 1018 sc->nsect = mdio->md_size / (PAGE_SIZE / DEV_BSIZE); 1019 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, sc->secsize * (vm_offset_t)sc->nsect, VM_PROT_DEFAULT, 0); 1020 sc->flags = mdio->md_options & MD_FORCE; 1021 if (mdio->md_options & MD_RESERVE) { 1022 if (swap_pager_reserve(sc->object, 0, sc->nsect) < 0) { 1023 vm_object_deallocate(sc->object); 1024 sc->object = NULL; 1025 mddestroy(sc, td); 1026 return (EDOM); 1027 } 1028 } 1029 error = mdsetcred(sc, td->td_ucred); 1030 if (error) { 1031 mddestroy(sc, td); 1032 return (error); 1033 } 1034 mdinit(sc); 1035 if (!(mdio->md_options & MD_RESERVE)) 1036 sc->pp->flags |= G_PF_CANDELETE; 1037 return (0); 1038 } 1039 1040 static int 1041 mddetach(int unit, struct thread *td) 1042 { 1043 struct md_s *sc; 1044 1045 sc = mdfind(unit); 1046 if (sc == NULL) 1047 return (ENOENT); 1048 if (sc->opencount != 0 && !(sc->flags & MD_FORCE)) 1049 return (EBUSY); 1050 switch(sc->type) { 1051 case MD_VNODE: 1052 case MD_SWAP: 1053 case MD_MALLOC: 1054 case MD_PRELOAD: 1055 return (mddestroy(sc, td)); 1056 default: 1057 return (EOPNOTSUPP); 1058 } 1059 } 1060 1061 static int 1062 mdctlioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 1063 { 1064 struct md_ioctl *mdio; 1065 struct md_s *sc; 1066 int i; 1067 1068 if (md_debug) 1069 printf("mdctlioctl(%s %lx %p %x %p)\n", 1070 devtoname(dev), cmd, addr, flags, td); 1071 1072 /* 1073 * We assert the version number in the individual ioctl 1074 * handlers instead of out here because (a) it is possible we 1075 * may add another ioctl in the future which doesn't read an 1076 * mdio, and (b) the correct return value for an unknown ioctl 1077 * is ENOIOCTL, not EINVAL. 1078 */ 1079 mdio = (struct md_ioctl *)addr; 1080 switch (cmd) { 1081 case MDIOCATTACH: 1082 if (mdio->md_version != MDIOVERSION) 1083 return (EINVAL); 1084 switch (mdio->md_type) { 1085 case MD_MALLOC: 1086 return (mdcreate_malloc(mdio)); 1087 case MD_PRELOAD: 1088 return (mdcreate_preload(mdio)); 1089 case MD_VNODE: 1090 return (mdcreate_vnode(mdio, td)); 1091 case MD_SWAP: 1092 return (mdcreate_swap(mdio, td)); 1093 default: 1094 return (EINVAL); 1095 } 1096 case MDIOCDETACH: 1097 if (mdio->md_version != MDIOVERSION) 1098 return (EINVAL); 1099 if (mdio->md_file != NULL || mdio->md_size != 0 || 1100 mdio->md_options != 0) 1101 return (EINVAL); 1102 return (mddetach(mdio->md_unit, td)); 1103 case MDIOCQUERY: 1104 if (mdio->md_version != MDIOVERSION) 1105 return (EINVAL); 1106 sc = mdfind(mdio->md_unit); 1107 if (sc == NULL) 1108 return (ENOENT); 1109 mdio->md_type = sc->type; 1110 mdio->md_options = sc->flags; 1111 switch (sc->type) { 1112 case MD_MALLOC: 1113 mdio->md_size = sc->nsect; 1114 break; 1115 case MD_PRELOAD: 1116 mdio->md_size = sc->nsect; 1117 mdio->md_base = (uint64_t)(intptr_t)sc->pl_ptr; 1118 break; 1119 case MD_SWAP: 1120 mdio->md_size = sc->nsect * (PAGE_SIZE / DEV_BSIZE); 1121 break; 1122 case MD_VNODE: 1123 mdio->md_size = sc->nsect; 1124 /* XXX fill this in */ 1125 mdio->md_file = NULL; 1126 break; 1127 } 1128 return (0); 1129 case MDIOCLIST: 1130 i = 1; 1131 LIST_FOREACH(sc, &md_softc_list, list) { 1132 if (i == MDNPAD - 1) 1133 mdio->md_pad[i] = -1; 1134 else 1135 mdio->md_pad[i++] = sc->unit; 1136 } 1137 mdio->md_pad[0] = i - 1; 1138 return (0); 1139 default: 1140 return (ENOIOCTL); 1141 }; 1142 return (ENOIOCTL); 1143 } 1144 1145 static void 1146 md_preloaded(u_char *image, unsigned length) 1147 { 1148 struct md_s *sc; 1149 1150 sc = mdnew(-1); 1151 if (sc == NULL) 1152 return; 1153 sc->type = MD_PRELOAD; 1154 sc->secsize = DEV_BSIZE; 1155 sc->nsect = length / DEV_BSIZE; 1156 sc->pl_ptr = image; 1157 sc->pl_len = length; 1158 if (sc->unit == 0) 1159 mdrootready = 1; 1160 mdinit(sc); 1161 } 1162 1163 static void 1164 md_drvinit(void *unused) 1165 { 1166 1167 caddr_t mod; 1168 caddr_t c; 1169 u_char *ptr, *name, *type; 1170 unsigned len; 1171 1172 #ifdef MD_ROOT_SIZE 1173 md_preloaded(mfs_root, MD_ROOT_SIZE*1024); 1174 #endif 1175 mod = NULL; 1176 while ((mod = preload_search_next_name(mod)) != NULL) { 1177 name = (char *)preload_search_info(mod, MODINFO_NAME); 1178 type = (char *)preload_search_info(mod, MODINFO_TYPE); 1179 if (name == NULL) 1180 continue; 1181 if (type == NULL) 1182 continue; 1183 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 1184 continue; 1185 c = preload_search_info(mod, MODINFO_ADDR); 1186 ptr = *(u_char **)c; 1187 c = preload_search_info(mod, MODINFO_SIZE); 1188 len = *(size_t *)c; 1189 printf("%s%d: Preloaded image <%s> %d bytes at %p\n", 1190 MD_NAME, mdunits, name, len, ptr); 1191 md_preloaded(ptr, len); 1192 } 1193 status_dev = make_dev(&mdctl_cdevsw, 0xffff00ff, UID_ROOT, GID_WHEEL, 1194 0600, MDCTL_NAME); 1195 } 1196 1197 static int 1198 md_modevent(module_t mod, int type, void *data) 1199 { 1200 int error; 1201 struct md_s *sc; 1202 1203 switch (type) { 1204 case MOD_LOAD: 1205 md_drvinit(NULL); 1206 break; 1207 case MOD_UNLOAD: 1208 LIST_FOREACH(sc, &md_softc_list, list) { 1209 error = mddetach(sc->unit, curthread); 1210 if (error != 0) 1211 return (error); 1212 } 1213 if (status_dev) 1214 destroy_dev(status_dev); 1215 status_dev = 0; 1216 break; 1217 default: 1218 break; 1219 } 1220 return (0); 1221 } 1222 1223 static moduledata_t md_mod = { 1224 MD_NAME, 1225 md_modevent, 1226 NULL 1227 }; 1228 DECLARE_MODULE(md, md_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE+CDEV_MAJOR); 1229 MODULE_VERSION(md, MD_MODVER); 1230 1231 1232 #ifdef MD_ROOT 1233 static void 1234 md_takeroot(void *junk) 1235 { 1236 if (mdrootready) 1237 rootdevnames[0] = "ufs:/dev/md0"; 1238 } 1239 1240 SYSINIT(md_root, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, md_takeroot, NULL); 1241 #endif /* MD_ROOT */ 1242