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