1 /* 2 * ---------------------------------------------------------------------------- 3 * "THE BEER-WARE LICENSE" (Revision 42): 4 * <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you 5 * can do whatever you want with this stuff. If we meet some day, and you think 6 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 7 * ---------------------------------------------------------------------------- 8 * 9 * $FreeBSD$ 10 * 11 */ 12 13 /* 14 * The following functions are based in the vn(4) driver: mdstart_swap(), 15 * mdstart_vnode(), mdcreate_swap(), mdcreate_vnode() and mddestroy(), 16 * and as such under the following copyright: 17 * 18 * Copyright (c) 1988 University of Utah. 19 * Copyright (c) 1990, 1993 20 * The Regents of the University of California. All rights reserved. 21 * 22 * This code is derived from software contributed to Berkeley by 23 * the Systems Programming Group of the University of Utah Computer 24 * Science Department. 25 * 26 * Redistribution and use in source and binary forms, with or without 27 * modification, are permitted provided that the following conditions 28 * are met: 29 * 1. Redistributions of source code must retain the above copyright 30 * notice, this list of conditions and the following disclaimer. 31 * 2. Redistributions in binary form must reproduce the above copyright 32 * notice, this list of conditions and the following disclaimer in the 33 * documentation and/or other materials provided with the distribution. 34 * 3. All advertising materials mentioning features or use of this software 35 * must display the following acknowledgement: 36 * This product includes software developed by the University of 37 * California, Berkeley and its contributors. 38 * 4. Neither the name of the University nor the names of its contributors 39 * may be used to endorse or promote products derived from this software 40 * without specific prior written permission. 41 * 42 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 43 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 44 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 45 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 46 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 47 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 48 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 49 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 50 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 51 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 52 * SUCH DAMAGE. 53 * 54 * from: Utah Hdr: vn.c 1.13 94/04/02 55 * 56 * from: @(#)vn.c 8.6 (Berkeley) 4/1/94 57 * From: src/sys/dev/vn/vn.c,v 1.122 2000/12/16 16:06:03 58 */ 59 60 #include "opt_geom.h" 61 #include "opt_md.h" 62 63 #include <sys/param.h> 64 #include <sys/systm.h> 65 #include <sys/bio.h> 66 #include <sys/conf.h> 67 #include <sys/fcntl.h> 68 #include <sys/kernel.h> 69 #include <sys/kthread.h> 70 #include <sys/linker.h> 71 #include <sys/lock.h> 72 #include <sys/malloc.h> 73 #include <sys/mdioctl.h> 74 #include <sys/mutex.h> 75 #include <sys/namei.h> 76 #include <sys/proc.h> 77 #include <sys/queue.h> 78 #include <sys/sysctl.h> 79 #include <sys/vnode.h> 80 81 #include <geom/geom.h> 82 83 #include <vm/vm.h> 84 #include <vm/vm_object.h> 85 #include <vm/vm_page.h> 86 #include <vm/vm_pager.h> 87 #include <vm/swap_pager.h> 88 #include <vm/uma.h> 89 90 #define MD_MODVER 1 91 92 #define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */ 93 94 #ifndef MD_NSECT 95 #define MD_NSECT (10000 * 2) 96 #endif 97 98 static MALLOC_DEFINE(M_MD, "MD disk", "Memory Disk"); 99 static MALLOC_DEFINE(M_MDSECT, "MD sectors", "Memory Disk Sectors"); 100 101 static int md_debug; 102 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, ""); 103 104 #if defined(MD_ROOT) && defined(MD_ROOT_SIZE) 105 /* Image gets put here: */ 106 static u_char mfs_root[MD_ROOT_SIZE*1024] = "MFS Filesystem goes here"; 107 static u_char end_mfs_root[] __unused = "MFS Filesystem had better STOP here"; 108 #endif 109 110 static int mdrootready; 111 static int mdunits; 112 static dev_t status_dev = 0; 113 114 #define CDEV_MAJOR 95 115 116 static d_ioctl_t mdctlioctl; 117 118 static struct cdevsw mdctl_cdevsw = { 119 .d_open = nullopen, 120 .d_close = nullclose, 121 .d_ioctl = mdctlioctl, 122 .d_name = MD_NAME, 123 .d_maj = CDEV_MAJOR 124 }; 125 126 127 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(&md_softc_list); 128 129 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 130 #define NMASK (NINDIR-1) 131 static int nshift; 132 133 struct indir { 134 uintptr_t *array; 135 u_int total; 136 u_int used; 137 u_int shift; 138 }; 139 140 struct md_s { 141 int unit; 142 LIST_ENTRY(md_s) list; 143 struct bio_queue_head bio_queue; 144 struct mtx queue_mtx; 145 dev_t dev; 146 enum md_types type; 147 unsigned nsect; 148 unsigned opencount; 149 unsigned secsize; 150 unsigned fwheads; 151 unsigned fwsectors; 152 unsigned flags; 153 char name[20]; 154 struct proc *procp; 155 struct g_geom *gp; 156 struct g_provider *pp; 157 158 /* MD_MALLOC related fields */ 159 struct indir *indir; 160 uma_zone_t uma; 161 162 /* MD_PRELOAD related fields */ 163 u_char *pl_ptr; 164 unsigned pl_len; 165 166 /* MD_VNODE related fields */ 167 struct vnode *vnode; 168 struct ucred *cred; 169 170 /* MD_SWAP related fields */ 171 vm_object_t object; 172 }; 173 174 static int mddestroy(struct md_s *sc, struct thread *td); 175 176 static struct indir * 177 new_indir(u_int shift) 178 { 179 struct indir *ip; 180 181 ip = malloc(sizeof *ip, M_MD, M_NOWAIT | M_ZERO); 182 if (ip == NULL) 183 return (NULL); 184 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 185 M_MDSECT, M_NOWAIT | M_ZERO); 186 if (ip->array == NULL) { 187 free(ip, M_MD); 188 return (NULL); 189 } 190 ip->total = NINDIR; 191 ip->shift = shift; 192 return (ip); 193 } 194 195 static void 196 del_indir(struct indir *ip) 197 { 198 199 free(ip->array, M_MDSECT); 200 free(ip, M_MD); 201 } 202 203 static void 204 destroy_indir(struct md_s *sc, struct indir *ip) 205 { 206 int i; 207 208 for (i = 0; i < NINDIR; i++) { 209 if (!ip->array[i]) 210 continue; 211 if (ip->shift) 212 destroy_indir(sc, (struct indir*)(ip->array[i])); 213 else if (ip->array[i] > 255) 214 uma_zfree(sc->uma, (void *)(ip->array[i])); 215 } 216 del_indir(ip); 217 } 218 219 /* 220 * This function does the math and alloctes the top level "indir" structure 221 * for a device of "size" sectors. 222 */ 223 224 static struct indir * 225 dimension(off_t size) 226 { 227 off_t rcnt; 228 struct indir *ip; 229 int i, layer; 230 231 rcnt = size; 232 layer = 0; 233 while (rcnt > NINDIR) { 234 rcnt /= NINDIR; 235 layer++; 236 } 237 /* figure out log2(NINDIR) */ 238 for (i = NINDIR, nshift = -1; i; nshift++) 239 i >>= 1; 240 241 /* 242 * XXX: the top layer is probably not fully populated, so we allocate 243 * too much space for ip->array in here. 244 */ 245 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO); 246 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 247 M_MDSECT, M_WAITOK | M_ZERO); 248 ip->total = NINDIR; 249 ip->shift = layer * nshift; 250 return (ip); 251 } 252 253 /* 254 * Read a given sector 255 */ 256 257 static uintptr_t 258 s_read(struct indir *ip, off_t offset) 259 { 260 struct indir *cip; 261 int idx; 262 uintptr_t up; 263 264 if (md_debug > 1) 265 printf("s_read(%jd)\n", (intmax_t)offset); 266 up = 0; 267 for (cip = ip; cip != NULL;) { 268 if (cip->shift) { 269 idx = (offset >> cip->shift) & NMASK; 270 up = cip->array[idx]; 271 cip = (struct indir *)up; 272 continue; 273 } 274 idx = offset & NMASK; 275 return (cip->array[idx]); 276 } 277 return (0); 278 } 279 280 /* 281 * Write a given sector, prune the tree if the value is 0 282 */ 283 284 static int 285 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 286 { 287 struct indir *cip, *lip[10]; 288 int idx, li; 289 uintptr_t up; 290 291 if (md_debug > 1) 292 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 293 up = 0; 294 li = 0; 295 cip = ip; 296 for (;;) { 297 lip[li++] = cip; 298 if (cip->shift) { 299 idx = (offset >> cip->shift) & NMASK; 300 up = cip->array[idx]; 301 if (up != 0) { 302 cip = (struct indir *)up; 303 continue; 304 } 305 /* Allocate branch */ 306 cip->array[idx] = 307 (uintptr_t)new_indir(cip->shift - nshift); 308 if (cip->array[idx] == 0) 309 return (ENOSPC); 310 cip->used++; 311 up = cip->array[idx]; 312 cip = (struct indir *)up; 313 continue; 314 } 315 /* leafnode */ 316 idx = offset & NMASK; 317 up = cip->array[idx]; 318 if (up != 0) 319 cip->used--; 320 cip->array[idx] = ptr; 321 if (ptr != 0) 322 cip->used++; 323 break; 324 } 325 if (cip->used != 0 || li == 1) 326 return (0); 327 li--; 328 while (cip->used == 0 && cip != ip) { 329 li--; 330 idx = (offset >> lip[li]->shift) & NMASK; 331 up = lip[li]->array[idx]; 332 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 333 del_indir(cip); 334 lip[li]->array[idx] = 0; 335 lip[li]->used--; 336 cip = lip[li]; 337 } 338 return (0); 339 } 340 341 342 struct g_class g_md_class = { 343 .name = "MD", 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_blkno = bp->bio_offset >> DEV_BSHIFT; 373 bp->bio_pblkno = bp->bio_offset / sc->secsize; 374 bp->bio_bcount = bp->bio_length; 375 mtx_lock(&sc->queue_mtx); 376 bioq_disksort(&sc->bio_queue, bp); 377 mtx_unlock(&sc->queue_mtx); 378 379 wakeup(sc); 380 } 381 382 DECLARE_GEOM_CLASS(g_md_class, g_md); 383 384 385 static int 386 mdstart_malloc(struct md_s *sc, struct bio *bp) 387 { 388 int i, error; 389 u_char *dst; 390 unsigned secno, nsec, uc; 391 uintptr_t sp, osp; 392 393 nsec = bp->bio_bcount / sc->secsize; 394 secno = bp->bio_pblkno; 395 dst = bp->bio_data; 396 error = 0; 397 while (nsec--) { 398 osp = s_read(sc->indir, secno); 399 if (bp->bio_cmd == BIO_DELETE) { 400 if (osp != 0) 401 error = s_write(sc->indir, secno, 0); 402 } else if (bp->bio_cmd == BIO_READ) { 403 if (osp == 0) 404 bzero(dst, sc->secsize); 405 else if (osp <= 255) 406 for (i = 0; i < sc->secsize; i++) 407 dst[i] = osp; 408 else 409 bcopy((void *)osp, dst, sc->secsize); 410 osp = 0; 411 } else if (bp->bio_cmd == BIO_WRITE) { 412 if (sc->flags & MD_COMPRESS) { 413 uc = dst[0]; 414 for (i = 1; i < sc->secsize; i++) 415 if (dst[i] != uc) 416 break; 417 } else { 418 i = 0; 419 uc = 0; 420 } 421 if (i == sc->secsize) { 422 if (osp != uc) 423 error = s_write(sc->indir, secno, uc); 424 } else { 425 if (osp <= 255) { 426 sp = (uintptr_t) uma_zalloc( 427 sc->uma, M_NOWAIT); 428 if (sp == 0) { 429 error = ENOSPC; 430 break; 431 } 432 bcopy(dst, (void *)sp, sc->secsize); 433 error = s_write(sc->indir, secno, sp); 434 } else { 435 bcopy(dst, (void *)osp, sc->secsize); 436 osp = 0; 437 } 438 } 439 } else { 440 error = EOPNOTSUPP; 441 } 442 if (osp > 255) 443 uma_zfree(sc->uma, (void*)osp); 444 if (error) 445 break; 446 secno++; 447 dst += sc->secsize; 448 } 449 bp->bio_resid = 0; 450 return (error); 451 } 452 453 static int 454 mdstart_preload(struct md_s *sc, struct bio *bp) 455 { 456 457 if (bp->bio_cmd == BIO_DELETE) { 458 } else if (bp->bio_cmd == BIO_READ) { 459 bcopy(sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_data, bp->bio_bcount); 460 } else { 461 bcopy(bp->bio_data, sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_bcount); 462 } 463 bp->bio_resid = 0; 464 return (0); 465 } 466 467 static int 468 mdstart_vnode(struct md_s *sc, struct bio *bp) 469 { 470 int error; 471 struct uio auio; 472 struct iovec aiov; 473 struct mount *mp; 474 475 /* 476 * VNODE I/O 477 * 478 * If an error occurs, we set BIO_ERROR but we do not set 479 * B_INVAL because (for a write anyway), the buffer is 480 * still valid. 481 */ 482 483 bzero(&auio, sizeof(auio)); 484 485 aiov.iov_base = bp->bio_data; 486 aiov.iov_len = bp->bio_bcount; 487 auio.uio_iov = &aiov; 488 auio.uio_iovcnt = 1; 489 auio.uio_offset = (vm_ooffset_t)bp->bio_pblkno * sc->secsize; 490 auio.uio_segflg = UIO_SYSSPACE; 491 if(bp->bio_cmd == BIO_READ) 492 auio.uio_rw = UIO_READ; 493 else if(bp->bio_cmd == BIO_WRITE) 494 auio.uio_rw = UIO_WRITE; 495 else 496 panic("wrong BIO_OP in mdstart_vnode"); 497 auio.uio_resid = bp->bio_bcount; 498 auio.uio_td = curthread; 499 /* 500 * When reading set IO_DIRECT to try to avoid double-caching 501 * the data. When writing IO_DIRECT is not optimal. 502 */ 503 if (bp->bio_cmd == BIO_READ) { 504 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 505 error = VOP_READ(sc->vnode, &auio, IO_DIRECT, sc->cred); 506 } else { 507 (void) vn_start_write(sc->vnode, &mp, V_WAIT); 508 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 509 error = VOP_WRITE(sc->vnode, &auio, 0, sc->cred); 510 vn_finished_write(mp); 511 } 512 VOP_UNLOCK(sc->vnode, 0, curthread); 513 bp->bio_resid = auio.uio_resid; 514 return (error); 515 } 516 517 #include <vm/vm_extern.h> 518 #include <vm/vm_kern.h> 519 520 static int 521 mdstart_swap(struct md_s *sc, struct bio *bp) 522 { 523 { 524 int i, o, rv; 525 vm_page_t m; 526 u_char *p; 527 vm_offset_t kva; 528 529 p = bp->bio_data; 530 o = bp->bio_offset / sc->secsize; 531 mtx_lock(&Giant); 532 kva = kmem_alloc_nofault(kernel_map, sc->secsize); 533 534 VM_OBJECT_LOCK(sc->object); 535 vm_object_pip_add(sc->object, 1); 536 for (i = 0; i < bp->bio_length / sc->secsize; i++) { 537 m = vm_page_grab(sc->object, i + o, 538 VM_ALLOC_NORMAL|VM_ALLOC_RETRY); 539 pmap_qenter(kva, &m, 1); 540 if (bp->bio_cmd == BIO_READ) { 541 if (m->valid != VM_PAGE_BITS_ALL) { 542 rv = vm_pager_get_pages(sc->object, 543 &m, 1, 0); 544 } 545 bcopy((void *)kva, p, sc->secsize); 546 } else if (bp->bio_cmd == BIO_WRITE) { 547 bcopy(p, (void *)kva, sc->secsize); 548 m->valid = VM_PAGE_BITS_ALL; 549 #if 0 550 } else if (bp->bio_cmd == BIO_DELETE) { 551 bzero((void *)kva, sc->secsize); 552 vm_page_dirty(m); 553 m->valid = VM_PAGE_BITS_ALL; 554 #endif 555 } 556 pmap_qremove(kva, 1); 557 vm_page_lock_queues(); 558 vm_page_wakeup(m); 559 vm_page_activate(m); 560 if (bp->bio_cmd == BIO_WRITE) { 561 vm_page_dirty(m); 562 } 563 vm_page_unlock_queues(); 564 p += sc->secsize; 565 #if 0 566 if (bootverbose || o < 17) 567 printf("wire_count %d busy %d flags %x hold_count %d act_count %d queue %d valid %d dirty %d @ %d\n", 568 m->wire_count, m->busy, 569 m->flags, m->hold_count, m->act_count, m->queue, m->valid, m->dirty, o + i); 570 #endif 571 } 572 vm_object_pip_subtract(sc->object, 1); 573 vm_object_set_writeable_dirty(sc->object); 574 VM_OBJECT_UNLOCK(sc->object); 575 kmem_free(kernel_map, kva, sc->secsize); 576 mtx_unlock(&Giant); 577 return (0); 578 } 579 } 580 581 static void 582 md_kthread(void *arg) 583 { 584 struct md_s *sc; 585 struct bio *bp; 586 int error, hasgiant; 587 588 sc = arg; 589 curthread->td_base_pri = PRIBIO; 590 591 switch (sc->type) { 592 case MD_SWAP: 593 case MD_VNODE: 594 mtx_lock(&Giant); 595 hasgiant = 1; 596 break; 597 case MD_MALLOC: 598 case MD_PRELOAD: 599 default: 600 hasgiant = 0; 601 break; 602 } 603 604 for (;;) { 605 mtx_lock(&sc->queue_mtx); 606 bp = bioq_first(&sc->bio_queue); 607 if (bp) 608 bioq_remove(&sc->bio_queue, bp); 609 if (!bp) { 610 if (sc->flags & MD_SHUTDOWN) { 611 mtx_unlock(&sc->queue_mtx); 612 sc->procp = NULL; 613 wakeup(&sc->procp); 614 if (!hasgiant) 615 mtx_lock(&Giant); 616 kthread_exit(0); 617 } 618 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 619 continue; 620 } 621 mtx_unlock(&sc->queue_mtx); 622 if (bp->bio_cmd == BIO_GETATTR) { 623 if (sc->fwsectors && sc->fwheads && 624 (g_handleattr_int(bp, "GEOM::fwsectors", 625 sc->fwsectors) || 626 g_handleattr_int(bp, "GEOM::fwheads", 627 sc->fwheads))) 628 error = -1; 629 else 630 error = EOPNOTSUPP; 631 } else { 632 switch (sc->type) { 633 case MD_MALLOC: 634 error = mdstart_malloc(sc, bp); 635 break; 636 case MD_PRELOAD: 637 error = mdstart_preload(sc, bp); 638 break; 639 case MD_VNODE: 640 error = mdstart_vnode(sc, bp); 641 break; 642 case MD_SWAP: 643 error = mdstart_swap(sc, bp); 644 break; 645 default: 646 panic("Impossible md(type)"); 647 break; 648 } 649 } 650 651 if (error != -1) { 652 bp->bio_completed = bp->bio_length; 653 g_io_deliver(bp, error); 654 } 655 } 656 } 657 658 static struct md_s * 659 mdfind(int unit) 660 { 661 struct md_s *sc; 662 663 /* XXX: LOCK(unique unit numbers) */ 664 LIST_FOREACH(sc, &md_softc_list, list) { 665 if (sc->unit == unit) 666 break; 667 } 668 /* XXX: UNLOCK(unique unit numbers) */ 669 return (sc); 670 } 671 672 static struct md_s * 673 mdnew(int unit) 674 { 675 struct md_s *sc; 676 int error, max = -1; 677 678 /* XXX: LOCK(unique unit numbers) */ 679 LIST_FOREACH(sc, &md_softc_list, list) { 680 if (sc->unit == unit) { 681 /* XXX: UNLOCK(unique unit numbers) */ 682 return (NULL); 683 } 684 if (sc->unit > max) 685 max = sc->unit; 686 } 687 if (unit == -1) 688 unit = max + 1; 689 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 690 sc->unit = unit; 691 bioq_init(&sc->bio_queue); 692 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 693 sprintf(sc->name, "md%d", unit); 694 error = kthread_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 695 if (error) { 696 free(sc, M_MD); 697 return (NULL); 698 } 699 LIST_INSERT_HEAD(&md_softc_list, sc, list); 700 /* XXX: UNLOCK(unique unit numbers) */ 701 return (sc); 702 } 703 704 static void 705 mdinit(struct md_s *sc) 706 { 707 708 struct g_geom *gp; 709 struct g_provider *pp; 710 711 DROP_GIANT(); 712 g_topology_lock(); 713 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 714 gp->start = g_md_start; 715 gp->access = g_md_access; 716 gp->softc = sc; 717 pp = g_new_providerf(gp, "md%d", sc->unit); 718 pp->mediasize = (off_t)sc->nsect * sc->secsize; 719 pp->sectorsize = sc->secsize; 720 sc->gp = gp; 721 sc->pp = pp; 722 g_error_provider(pp, 0); 723 g_topology_unlock(); 724 PICKUP_GIANT(); 725 } 726 727 /* 728 * XXX: we should check that the range they feed us is mapped. 729 * XXX: we should implement read-only. 730 */ 731 732 static int 733 mdcreate_preload(struct md_ioctl *mdio) 734 { 735 struct md_s *sc; 736 737 if (mdio->md_size == 0) 738 return (EINVAL); 739 if (mdio->md_options & ~(MD_AUTOUNIT)) 740 return (EINVAL); 741 if (mdio->md_options & MD_AUTOUNIT) { 742 sc = mdnew(-1); 743 if (sc == NULL) 744 return (ENOMEM); 745 mdio->md_unit = sc->unit; 746 } else { 747 sc = mdnew(mdio->md_unit); 748 if (sc == NULL) 749 return (EBUSY); 750 } 751 sc->type = MD_PRELOAD; 752 sc->secsize = DEV_BSIZE; 753 sc->nsect = mdio->md_size; 754 sc->flags = mdio->md_options & MD_FORCE; 755 /* Cast to pointer size, then to pointer to avoid warning */ 756 sc->pl_ptr = (u_char *)(uintptr_t)mdio->md_base; 757 sc->pl_len = (mdio->md_size << DEV_BSHIFT); 758 mdinit(sc); 759 return (0); 760 } 761 762 763 static int 764 mdcreate_malloc(struct md_ioctl *mdio) 765 { 766 struct md_s *sc; 767 off_t u; 768 uintptr_t sp; 769 int error; 770 771 error = 0; 772 if (mdio->md_size == 0) 773 return (EINVAL); 774 if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 775 return (EINVAL); 776 if (mdio->md_secsize != 0 && !powerof2(mdio->md_secsize)) 777 return (EINVAL); 778 /* Compression doesn't make sense if we have reserved space */ 779 if (mdio->md_options & MD_RESERVE) 780 mdio->md_options &= ~MD_COMPRESS; 781 if (mdio->md_options & MD_AUTOUNIT) { 782 sc = mdnew(-1); 783 if (sc == NULL) 784 return (ENOMEM); 785 mdio->md_unit = sc->unit; 786 } else { 787 sc = mdnew(mdio->md_unit); 788 if (sc == NULL) 789 return (EBUSY); 790 } 791 sc->type = MD_MALLOC; 792 if (mdio->md_secsize != 0) 793 sc->secsize = mdio->md_secsize; 794 else 795 sc->secsize = DEV_BSIZE; 796 if (mdio->md_fwsectors != 0) 797 sc->fwsectors = mdio->md_fwsectors; 798 if (mdio->md_fwheads != 0) 799 sc->fwheads = mdio->md_fwheads; 800 sc->nsect = mdio->md_size; 801 sc->nsect /= (sc->secsize / DEV_BSIZE); 802 sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE); 803 sc->indir = dimension(sc->nsect); 804 sc->uma = uma_zcreate(sc->name, sc->secsize, 805 NULL, NULL, NULL, NULL, 0x1ff, 0); 806 if (mdio->md_options & MD_RESERVE) { 807 for (u = 0; u < sc->nsect; u++) { 808 sp = (uintptr_t) uma_zalloc(sc->uma, M_NOWAIT | M_ZERO); 809 if (sp != 0) 810 error = s_write(sc->indir, u, sp); 811 else 812 error = ENOMEM; 813 if (error) 814 break; 815 } 816 } 817 if (error) { 818 mddestroy(sc, NULL); 819 return (error); 820 } 821 mdinit(sc); 822 if (!(mdio->md_options & MD_RESERVE)) 823 sc->pp->flags |= G_PF_CANDELETE; 824 return (0); 825 } 826 827 828 static int 829 mdsetcred(struct md_s *sc, struct ucred *cred) 830 { 831 char *tmpbuf; 832 int error = 0; 833 834 /* 835 * Set credits in our softc 836 */ 837 838 if (sc->cred) 839 crfree(sc->cred); 840 sc->cred = crhold(cred); 841 842 /* 843 * Horrible kludge to establish credentials for NFS XXX. 844 */ 845 846 if (sc->vnode) { 847 struct uio auio; 848 struct iovec aiov; 849 850 tmpbuf = malloc(sc->secsize, M_TEMP, M_WAITOK); 851 bzero(&auio, sizeof(auio)); 852 853 aiov.iov_base = tmpbuf; 854 aiov.iov_len = sc->secsize; 855 auio.uio_iov = &aiov; 856 auio.uio_iovcnt = 1; 857 auio.uio_offset = 0; 858 auio.uio_rw = UIO_READ; 859 auio.uio_segflg = UIO_SYSSPACE; 860 auio.uio_resid = aiov.iov_len; 861 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 862 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 863 VOP_UNLOCK(sc->vnode, 0, curthread); 864 free(tmpbuf, M_TEMP); 865 } 866 return (error); 867 } 868 869 static int 870 mdcreate_vnode(struct md_ioctl *mdio, struct thread *td) 871 { 872 struct md_s *sc; 873 struct vattr vattr; 874 struct nameidata nd; 875 int error, flags; 876 877 flags = FREAD|FWRITE; 878 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 879 error = vn_open(&nd, &flags, 0, -1); 880 if (error) { 881 if (error != EACCES && error != EPERM && error != EROFS) 882 return (error); 883 flags &= ~FWRITE; 884 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 885 error = vn_open(&nd, &flags, 0, -1); 886 if (error) 887 return (error); 888 } 889 NDFREE(&nd, NDF_ONLY_PNBUF); 890 if (nd.ni_vp->v_type != VREG || 891 (error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred, td))) { 892 VOP_UNLOCK(nd.ni_vp, 0, td); 893 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 894 return (error ? error : EINVAL); 895 } 896 VOP_UNLOCK(nd.ni_vp, 0, td); 897 898 if (mdio->md_options & MD_AUTOUNIT) { 899 sc = mdnew(-1); 900 mdio->md_unit = sc->unit; 901 } else { 902 sc = mdnew(mdio->md_unit); 903 } 904 if (sc == NULL) { 905 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 906 return (EBUSY); 907 } 908 909 sc->type = MD_VNODE; 910 sc->flags = mdio->md_options & MD_FORCE; 911 if (!(flags & FWRITE)) 912 sc->flags |= MD_READONLY; 913 sc->secsize = DEV_BSIZE; 914 sc->vnode = nd.ni_vp; 915 916 /* 917 * If the size is specified, override the file attributes. 918 */ 919 if (mdio->md_size) 920 sc->nsect = mdio->md_size; 921 else 922 sc->nsect = vattr.va_size / sc->secsize; /* XXX: round up ? */ 923 if (sc->nsect == 0) { 924 mddestroy(sc, td); 925 return (EINVAL); 926 } 927 error = mdsetcred(sc, td->td_ucred); 928 if (error) { 929 mddestroy(sc, td); 930 return (error); 931 } 932 mdinit(sc); 933 return (0); 934 } 935 936 static void 937 md_zapit(void *p, int cancel) 938 { 939 if (cancel) 940 return; 941 g_wither_geom(p, ENXIO); 942 } 943 944 static int 945 mddestroy(struct md_s *sc, struct thread *td) 946 { 947 948 GIANT_REQUIRED; 949 950 mtx_destroy(&sc->queue_mtx); 951 if (sc->gp) { 952 sc->gp->softc = NULL; 953 g_waitfor_event(md_zapit, sc->gp, M_WAITOK, sc->gp, NULL); 954 sc->gp = NULL; 955 sc->pp = NULL; 956 } 957 sc->flags |= MD_SHUTDOWN; 958 wakeup(sc); 959 while (sc->procp != NULL) 960 tsleep(&sc->procp, PRIBIO, "mddestroy", hz / 10); 961 if (sc->vnode != NULL) 962 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 963 FREAD : (FREAD|FWRITE), sc->cred, td); 964 if (sc->cred != NULL) 965 crfree(sc->cred); 966 if (sc->object != NULL) { 967 vm_object_deallocate(sc->object); 968 } 969 if (sc->indir) 970 destroy_indir(sc, sc->indir); 971 if (sc->uma) 972 uma_zdestroy(sc->uma); 973 974 /* XXX: LOCK(unique unit numbers) */ 975 LIST_REMOVE(sc, list); 976 /* XXX: UNLOCK(unique unit numbers) */ 977 free(sc, M_MD); 978 return (0); 979 } 980 981 static int 982 mdcreate_swap(struct md_ioctl *mdio, struct thread *td) 983 { 984 int error; 985 struct md_s *sc; 986 987 GIANT_REQUIRED; 988 989 if (mdio->md_options & MD_AUTOUNIT) { 990 sc = mdnew(-1); 991 mdio->md_unit = sc->unit; 992 } else { 993 sc = mdnew(mdio->md_unit); 994 } 995 if (sc == NULL) 996 return (EBUSY); 997 998 sc->type = MD_SWAP; 999 1000 /* 1001 * Range check. Disallow negative sizes or any size less then the 1002 * size of a page. Then round to a page. 1003 */ 1004 1005 if (mdio->md_size == 0) { 1006 mddestroy(sc, td); 1007 return (EDOM); 1008 } 1009 1010 /* 1011 * Allocate an OBJT_SWAP object. 1012 * 1013 * sc_secsize is PAGE_SIZE'd 1014 * 1015 * mdio->size is in DEV_BSIZE'd chunks. 1016 * Note the truncation. 1017 */ 1018 1019 sc->secsize = PAGE_SIZE; 1020 sc->nsect = mdio->md_size / (PAGE_SIZE / DEV_BSIZE); 1021 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, sc->secsize * (vm_offset_t)sc->nsect, VM_PROT_DEFAULT, 0); 1022 sc->flags = mdio->md_options & MD_FORCE; 1023 if (mdio->md_options & MD_RESERVE) { 1024 if (swap_pager_reserve(sc->object, 0, sc->nsect) < 0) { 1025 vm_object_deallocate(sc->object); 1026 sc->object = NULL; 1027 mddestroy(sc, td); 1028 return (EDOM); 1029 } 1030 } 1031 error = mdsetcred(sc, td->td_ucred); 1032 if (error) { 1033 mddestroy(sc, td); 1034 return (error); 1035 } 1036 mdinit(sc); 1037 if (!(mdio->md_options & MD_RESERVE)) 1038 sc->pp->flags |= G_PF_CANDELETE; 1039 return (0); 1040 } 1041 1042 static int 1043 mddetach(int unit, struct thread *td) 1044 { 1045 struct md_s *sc; 1046 1047 sc = mdfind(unit); 1048 if (sc == NULL) 1049 return (ENOENT); 1050 if (sc->opencount != 0 && !(sc->flags & MD_FORCE)) 1051 return (EBUSY); 1052 switch(sc->type) { 1053 case MD_VNODE: 1054 case MD_SWAP: 1055 case MD_MALLOC: 1056 case MD_PRELOAD: 1057 return (mddestroy(sc, td)); 1058 default: 1059 return (EOPNOTSUPP); 1060 } 1061 } 1062 1063 static int 1064 mdctlioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 1065 { 1066 struct md_ioctl *mdio; 1067 struct md_s *sc; 1068 int i; 1069 1070 if (md_debug) 1071 printf("mdctlioctl(%s %lx %p %x %p)\n", 1072 devtoname(dev), cmd, addr, flags, td); 1073 1074 /* 1075 * We assert the version number in the individual ioctl 1076 * handlers instead of out here because (a) it is possible we 1077 * may add another ioctl in the future which doesn't read an 1078 * mdio, and (b) the correct return value for an unknown ioctl 1079 * is ENOIOCTL, not EINVAL. 1080 */ 1081 mdio = (struct md_ioctl *)addr; 1082 switch (cmd) { 1083 case MDIOCATTACH: 1084 if (mdio->md_version != MDIOVERSION) 1085 return (EINVAL); 1086 switch (mdio->md_type) { 1087 case MD_MALLOC: 1088 return (mdcreate_malloc(mdio)); 1089 case MD_PRELOAD: 1090 return (mdcreate_preload(mdio)); 1091 case MD_VNODE: 1092 return (mdcreate_vnode(mdio, td)); 1093 case MD_SWAP: 1094 return (mdcreate_swap(mdio, td)); 1095 default: 1096 return (EINVAL); 1097 } 1098 case MDIOCDETACH: 1099 if (mdio->md_version != MDIOVERSION) 1100 return (EINVAL); 1101 if (mdio->md_file != NULL || mdio->md_size != 0 || 1102 mdio->md_options != 0) 1103 return (EINVAL); 1104 return (mddetach(mdio->md_unit, td)); 1105 case MDIOCQUERY: 1106 if (mdio->md_version != MDIOVERSION) 1107 return (EINVAL); 1108 sc = mdfind(mdio->md_unit); 1109 if (sc == NULL) 1110 return (ENOENT); 1111 mdio->md_type = sc->type; 1112 mdio->md_options = sc->flags; 1113 switch (sc->type) { 1114 case MD_MALLOC: 1115 mdio->md_size = sc->nsect; 1116 break; 1117 case MD_PRELOAD: 1118 mdio->md_size = sc->nsect; 1119 mdio->md_base = (uint64_t)(intptr_t)sc->pl_ptr; 1120 break; 1121 case MD_SWAP: 1122 mdio->md_size = sc->nsect * (PAGE_SIZE / DEV_BSIZE); 1123 break; 1124 case MD_VNODE: 1125 mdio->md_size = sc->nsect; 1126 /* XXX fill this in */ 1127 mdio->md_file = NULL; 1128 break; 1129 } 1130 return (0); 1131 case MDIOCLIST: 1132 i = 1; 1133 LIST_FOREACH(sc, &md_softc_list, list) { 1134 if (i == MDNPAD - 1) 1135 mdio->md_pad[i] = -1; 1136 else 1137 mdio->md_pad[i++] = sc->unit; 1138 } 1139 mdio->md_pad[0] = i - 1; 1140 return (0); 1141 default: 1142 return (ENOIOCTL); 1143 }; 1144 return (ENOIOCTL); 1145 } 1146 1147 static void 1148 md_preloaded(u_char *image, unsigned length) 1149 { 1150 struct md_s *sc; 1151 1152 sc = mdnew(-1); 1153 if (sc == NULL) 1154 return; 1155 sc->type = MD_PRELOAD; 1156 sc->secsize = DEV_BSIZE; 1157 sc->nsect = length / DEV_BSIZE; 1158 sc->pl_ptr = image; 1159 sc->pl_len = length; 1160 if (sc->unit == 0) 1161 mdrootready = 1; 1162 mdinit(sc); 1163 } 1164 1165 static void 1166 md_drvinit(void *unused) 1167 { 1168 1169 caddr_t mod; 1170 caddr_t c; 1171 u_char *ptr, *name, *type; 1172 unsigned len; 1173 1174 #ifdef MD_ROOT_SIZE 1175 md_preloaded(mfs_root, MD_ROOT_SIZE*1024); 1176 #endif 1177 mod = NULL; 1178 while ((mod = preload_search_next_name(mod)) != NULL) { 1179 name = (char *)preload_search_info(mod, MODINFO_NAME); 1180 type = (char *)preload_search_info(mod, MODINFO_TYPE); 1181 if (name == NULL) 1182 continue; 1183 if (type == NULL) 1184 continue; 1185 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 1186 continue; 1187 c = preload_search_info(mod, MODINFO_ADDR); 1188 ptr = *(u_char **)c; 1189 c = preload_search_info(mod, MODINFO_SIZE); 1190 len = *(size_t *)c; 1191 printf("%s%d: Preloaded image <%s> %d bytes at %p\n", 1192 MD_NAME, mdunits, name, len, ptr); 1193 md_preloaded(ptr, len); 1194 } 1195 status_dev = make_dev(&mdctl_cdevsw, 0xffff00ff, UID_ROOT, GID_WHEEL, 1196 0600, MDCTL_NAME); 1197 } 1198 1199 static int 1200 md_modevent(module_t mod, int type, void *data) 1201 { 1202 int error; 1203 struct md_s *sc; 1204 1205 switch (type) { 1206 case MOD_LOAD: 1207 md_drvinit(NULL); 1208 break; 1209 case MOD_UNLOAD: 1210 LIST_FOREACH(sc, &md_softc_list, list) { 1211 error = mddetach(sc->unit, curthread); 1212 if (error != 0) 1213 return (error); 1214 } 1215 if (status_dev) 1216 destroy_dev(status_dev); 1217 status_dev = 0; 1218 break; 1219 default: 1220 break; 1221 } 1222 return (0); 1223 } 1224 1225 static moduledata_t md_mod = { 1226 MD_NAME, 1227 md_modevent, 1228 NULL 1229 }; 1230 DECLARE_MODULE(md, md_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE+CDEV_MAJOR); 1231 MODULE_VERSION(md, MD_MODVER); 1232 1233 1234 #ifdef MD_ROOT 1235 static void 1236 md_takeroot(void *junk) 1237 { 1238 if (mdrootready) 1239 rootdevnames[0] = "ufs:/dev/md0"; 1240 } 1241 1242 SYSINIT(md_root, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, md_takeroot, NULL); 1243 #endif /* MD_ROOT */ 1244