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/devicestat.h> 68 #include <sys/disk.h> 69 #include <sys/fcntl.h> 70 #include <sys/kernel.h> 71 #include <sys/kthread.h> 72 #include <sys/linker.h> 73 #include <sys/lock.h> 74 #include <sys/malloc.h> 75 #include <sys/mdioctl.h> 76 #include <sys/mutex.h> 77 #include <sys/namei.h> 78 #include <sys/proc.h> 79 #include <sys/queue.h> 80 #include <sys/stdint.h> 81 #include <sys/sysctl.h> 82 #include <sys/vnode.h> 83 84 #include <geom/geom.h> 85 86 #include <vm/vm.h> 87 #include <vm/vm_object.h> 88 #include <vm/vm_page.h> 89 #include <vm/vm_pager.h> 90 #include <vm/swap_pager.h> 91 #include <vm/uma.h> 92 93 #define MD_MODVER 1 94 95 #define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */ 96 97 #ifndef MD_NSECT 98 #define MD_NSECT (10000 * 2) 99 #endif 100 101 static MALLOC_DEFINE(M_MD, "MD disk", "Memory Disk"); 102 static MALLOC_DEFINE(M_MDSECT, "MD sectors", "Memory Disk Sectors"); 103 104 static int md_debug; 105 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, ""); 106 107 #if defined(MD_ROOT) && defined(MD_ROOT_SIZE) 108 /* Image gets put here: */ 109 static u_char mfs_root[MD_ROOT_SIZE*1024] = "MFS Filesystem goes here"; 110 static u_char end_mfs_root[] __unused = "MFS Filesystem had better STOP here"; 111 #endif 112 113 static int mdrootready; 114 static int mdunits; 115 static dev_t status_dev = 0; 116 117 #define CDEV_MAJOR 95 118 119 static d_ioctl_t mdctlioctl; 120 121 static struct cdevsw mdctl_cdevsw = { 122 .d_open = nullopen, 123 .d_close = nullclose, 124 .d_ioctl = mdctlioctl, 125 .d_name = MD_NAME, 126 .d_maj = CDEV_MAJOR 127 }; 128 129 130 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(&md_softc_list); 131 132 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 133 #define NMASK (NINDIR-1) 134 static int nshift; 135 136 struct indir { 137 uintptr_t *array; 138 uint total; 139 uint used; 140 uint shift; 141 }; 142 143 struct md_s { 144 int unit; 145 LIST_ENTRY(md_s) list; 146 struct devstat stats; 147 struct bio_queue_head bio_queue; 148 struct mtx queue_mtx; 149 struct disk disk; 150 dev_t dev; 151 enum md_types type; 152 unsigned nsect; 153 unsigned opencount; 154 unsigned secsize; 155 unsigned flags; 156 char name[20]; 157 struct proc *procp; 158 struct g_geom *gp; 159 struct g_provider *pp; 160 161 /* MD_MALLOC related fields */ 162 struct indir *indir; 163 uma_zone_t uma; 164 165 /* MD_PRELOAD related fields */ 166 u_char *pl_ptr; 167 unsigned pl_len; 168 169 /* MD_VNODE related fields */ 170 struct vnode *vnode; 171 struct ucred *cred; 172 173 /* MD_SWAP related fields */ 174 vm_object_t object; 175 }; 176 177 static int mddestroy(struct md_s *sc, struct thread *td); 178 179 static struct indir * 180 new_indir(uint shift) 181 { 182 struct indir *ip; 183 184 ip = malloc(sizeof *ip, M_MD, M_NOWAIT | M_ZERO); 185 if (ip == NULL) 186 return (NULL); 187 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 188 M_MDSECT, M_NOWAIT | M_ZERO); 189 if (ip->array == NULL) { 190 free(ip, M_MD); 191 return (NULL); 192 } 193 ip->total = NINDIR; 194 ip->shift = shift; 195 return (ip); 196 } 197 198 static void 199 del_indir(struct indir *ip) 200 { 201 202 free(ip->array, M_MDSECT); 203 free(ip, M_MD); 204 } 205 206 static void 207 destroy_indir(struct md_s *sc, struct indir *ip) 208 { 209 int i; 210 211 for (i = 0; i < NINDIR; i++) { 212 if (!ip->array[i]) 213 continue; 214 if (ip->shift) 215 destroy_indir(sc, (struct indir*)(ip->array[i])); 216 else if (ip->array[i] > 255) 217 uma_zfree(sc->uma, (void *)(ip->array[i])); 218 } 219 del_indir(ip); 220 } 221 222 /* 223 * This function does the math and alloctes the top level "indir" structure 224 * for a device of "size" sectors. 225 */ 226 227 static struct indir * 228 dimension(off_t size) 229 { 230 off_t rcnt; 231 struct indir *ip; 232 int i, layer; 233 234 rcnt = size; 235 layer = 0; 236 while (rcnt > NINDIR) { 237 rcnt /= NINDIR; 238 layer++; 239 } 240 /* figure out log2(NINDIR) */ 241 for (i = NINDIR, nshift = -1; i; nshift++) 242 i >>= 1; 243 244 /* 245 * XXX: the top layer is probably not fully populated, so we allocate 246 * too much space for ip->array in new_indir() here. 247 */ 248 ip = new_indir(layer * nshift); 249 return (ip); 250 } 251 252 /* 253 * Read a given sector 254 */ 255 256 static uintptr_t 257 s_read(struct indir *ip, off_t offset) 258 { 259 struct indir *cip; 260 int idx; 261 uintptr_t up; 262 263 if (md_debug > 1) 264 printf("s_read(%jd)\n", (intmax_t)offset); 265 up = 0; 266 for (cip = ip; cip != NULL;) { 267 if (cip->shift) { 268 idx = (offset >> cip->shift) & NMASK; 269 up = cip->array[idx]; 270 cip = (struct indir *)up; 271 continue; 272 } 273 idx = offset & NMASK; 274 return (cip->array[idx]); 275 } 276 return (0); 277 } 278 279 /* 280 * Write a given sector, prune the tree if the value is 0 281 */ 282 283 static int 284 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 285 { 286 struct indir *cip, *lip[10]; 287 int idx, li; 288 uintptr_t up; 289 290 if (md_debug > 1) 291 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 292 up = 0; 293 li = 0; 294 cip = ip; 295 for (;;) { 296 lip[li++] = cip; 297 if (cip->shift) { 298 idx = (offset >> cip->shift) & NMASK; 299 up = cip->array[idx]; 300 if (up != 0) { 301 cip = (struct indir *)up; 302 continue; 303 } 304 /* Allocate branch */ 305 cip->array[idx] = 306 (uintptr_t)new_indir(cip->shift - nshift); 307 if (cip->array[idx] == 0) 308 return (ENOSPC); 309 cip->used++; 310 up = cip->array[idx]; 311 cip = (struct indir *)up; 312 continue; 313 } 314 /* leafnode */ 315 idx = offset & NMASK; 316 up = cip->array[idx]; 317 if (up != 0) 318 cip->used--; 319 cip->array[idx] = ptr; 320 if (ptr != 0) 321 cip->used++; 322 break; 323 } 324 if (cip->used != 0 || li == 1) 325 return (0); 326 li--; 327 while (cip->used == 0 && cip != ip) { 328 li--; 329 idx = (offset >> lip[li]->shift) & NMASK; 330 up = lip[li]->array[idx]; 331 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 332 del_indir(cip); 333 lip[li]->array[idx] = 0; 334 lip[li]->used--; 335 cip = lip[li]; 336 } 337 return (0); 338 } 339 340 341 struct g_class g_md_class = { 342 "MD", 343 NULL, 344 NULL, 345 G_CLASS_INITIALIZER 346 347 }; 348 349 static int 350 g_md_access(struct g_provider *pp, int r, int w, int e) 351 { 352 struct md_s *sc; 353 354 sc = pp->geom->softc; 355 r += pp->acr; 356 w += pp->acw; 357 e += pp->ace; 358 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 359 sc->opencount = 1; 360 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 361 sc->opencount = 0; 362 } 363 return (0); 364 } 365 366 static void 367 g_md_start(struct bio *bp) 368 { 369 struct md_s *sc; 370 371 sc = bp->bio_to->geom->softc; 372 373 switch(bp->bio_cmd) { 374 case BIO_GETATTR: 375 case BIO_SETATTR: 376 g_io_deliver(bp, EOPNOTSUPP); 377 return; 378 } 379 bp->bio_blkno = bp->bio_offset >> DEV_BSHIFT; 380 bp->bio_pblkno = bp->bio_offset / sc->secsize; 381 bp->bio_bcount = bp->bio_length; 382 mtx_lock(&sc->queue_mtx); 383 bioqdisksort(&sc->bio_queue, bp); 384 mtx_unlock(&sc->queue_mtx); 385 386 wakeup(sc); 387 } 388 389 DECLARE_GEOM_CLASS(g_md_class, g_md); 390 391 392 static int 393 mdstart_malloc(struct md_s *sc, struct bio *bp) 394 { 395 int i, error; 396 u_char *dst; 397 unsigned secno, nsec, uc; 398 uintptr_t sp, osp; 399 400 nsec = bp->bio_bcount / sc->secsize; 401 secno = bp->bio_pblkno; 402 dst = bp->bio_data; 403 error = 0; 404 while (nsec--) { 405 osp = s_read(sc->indir, secno); 406 if (bp->bio_cmd == BIO_DELETE) { 407 if (osp != 0) 408 error = s_write(sc->indir, secno, 0); 409 } else if (bp->bio_cmd == BIO_READ) { 410 if (osp == 0) 411 bzero(dst, sc->secsize); 412 else if (osp <= 255) 413 for (i = 0; i < sc->secsize; i++) 414 dst[i] = osp; 415 else 416 bcopy((void *)osp, dst, sc->secsize); 417 osp = 0; 418 } else if (bp->bio_cmd == BIO_WRITE) { 419 if (sc->flags & MD_COMPRESS) { 420 uc = dst[0]; 421 for (i = 1; i < sc->secsize; i++) 422 if (dst[i] != uc) 423 break; 424 } else { 425 i = 0; 426 uc = 0; 427 } 428 if (i == sc->secsize) { 429 if (osp != uc) 430 error = s_write(sc->indir, secno, uc); 431 } else { 432 if (osp <= 255) { 433 sp = (uintptr_t) uma_zalloc( 434 sc->uma, M_NOWAIT); 435 if (sp == 0) { 436 error = ENOSPC; 437 break; 438 } 439 bcopy(dst, (void *)sp, sc->secsize); 440 error = s_write(sc->indir, secno, sp); 441 } else { 442 bcopy(dst, (void *)osp, sc->secsize); 443 osp = 0; 444 } 445 } 446 } else { 447 error = EOPNOTSUPP; 448 } 449 if (osp > 255) 450 uma_zfree(sc->uma, (void*)osp); 451 if (error) 452 break; 453 secno++; 454 dst += sc->secsize; 455 } 456 bp->bio_resid = 0; 457 return (error); 458 } 459 460 static int 461 mdstart_preload(struct md_s *sc, struct bio *bp) 462 { 463 464 if (bp->bio_cmd == BIO_DELETE) { 465 } else if (bp->bio_cmd == BIO_READ) { 466 bcopy(sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_data, bp->bio_bcount); 467 } else { 468 bcopy(bp->bio_data, sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_bcount); 469 } 470 bp->bio_resid = 0; 471 return (0); 472 } 473 474 static int 475 mdstart_vnode(struct md_s *sc, struct bio *bp) 476 { 477 int error; 478 struct uio auio; 479 struct iovec aiov; 480 struct mount *mp; 481 482 /* 483 * VNODE I/O 484 * 485 * If an error occurs, we set BIO_ERROR but we do not set 486 * B_INVAL because (for a write anyway), the buffer is 487 * still valid. 488 */ 489 490 bzero(&auio, sizeof(auio)); 491 492 aiov.iov_base = bp->bio_data; 493 aiov.iov_len = bp->bio_bcount; 494 auio.uio_iov = &aiov; 495 auio.uio_iovcnt = 1; 496 auio.uio_offset = (vm_ooffset_t)bp->bio_pblkno * sc->secsize; 497 auio.uio_segflg = UIO_SYSSPACE; 498 if(bp->bio_cmd == BIO_READ) 499 auio.uio_rw = UIO_READ; 500 else 501 auio.uio_rw = UIO_WRITE; 502 auio.uio_resid = bp->bio_bcount; 503 auio.uio_td = curthread; 504 /* 505 * When reading set IO_DIRECT to try to avoid double-caching 506 * the data. When writing IO_DIRECT is not optimal, but we 507 * must set IO_NOWDRAIN to avoid a wdrain deadlock. 508 */ 509 if (bp->bio_cmd == BIO_READ) { 510 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 511 error = VOP_READ(sc->vnode, &auio, IO_DIRECT, sc->cred); 512 } else { 513 (void) vn_start_write(sc->vnode, &mp, V_WAIT); 514 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 515 error = VOP_WRITE(sc->vnode, &auio, IO_NOWDRAIN, sc->cred); 516 vn_finished_write(mp); 517 } 518 VOP_UNLOCK(sc->vnode, 0, curthread); 519 bp->bio_resid = auio.uio_resid; 520 return (error); 521 } 522 523 static void 524 mddone_swap(struct bio *bp) 525 { 526 527 bp->bio_completed = bp->bio_length - bp->bio_resid; 528 g_std_done(bp); 529 } 530 531 static int 532 mdstart_swap(struct md_s *sc, struct bio *bp) 533 { 534 { 535 struct bio *bp2; 536 537 bp2 = g_clone_bio(bp); 538 bp2->bio_done = mddone_swap; 539 bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; 540 bp2->bio_pblkno = bp2->bio_offset / sc->secsize; 541 bp2->bio_bcount = bp2->bio_length; 542 bp = bp2; 543 } 544 545 bp->bio_resid = 0; 546 if ((bp->bio_cmd == BIO_DELETE) && (sc->flags & MD_RESERVE)) 547 biodone(bp); 548 else 549 vm_pager_strategy(sc->object, bp); 550 return (-1); 551 } 552 553 static void 554 md_kthread(void *arg) 555 { 556 struct md_s *sc; 557 struct bio *bp; 558 int error, hasgiant; 559 560 sc = arg; 561 curthread->td_base_pri = PRIBIO; 562 563 switch (sc->type) { 564 case MD_SWAP: 565 case MD_VNODE: 566 mtx_lock(&Giant); 567 hasgiant = 1; 568 break; 569 case MD_MALLOC: 570 case MD_PRELOAD: 571 default: 572 hasgiant = 0; 573 break; 574 } 575 576 for (;;) { 577 mtx_lock(&sc->queue_mtx); 578 bp = bioq_first(&sc->bio_queue); 579 if (bp) 580 bioq_remove(&sc->bio_queue, bp); 581 if (!bp) { 582 if (sc->flags & MD_SHUTDOWN) { 583 mtx_unlock(&sc->queue_mtx); 584 sc->procp = NULL; 585 wakeup(&sc->procp); 586 if (!hasgiant) 587 mtx_lock(&Giant); 588 kthread_exit(0); 589 } 590 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 591 continue; 592 } 593 mtx_unlock(&sc->queue_mtx); 594 595 switch (sc->type) { 596 case MD_MALLOC: 597 devstat_start_transaction(&sc->stats); 598 error = mdstart_malloc(sc, bp); 599 break; 600 case MD_PRELOAD: 601 devstat_start_transaction(&sc->stats); 602 error = mdstart_preload(sc, bp); 603 break; 604 case MD_VNODE: 605 devstat_start_transaction(&sc->stats); 606 error = mdstart_vnode(sc, bp); 607 break; 608 case MD_SWAP: 609 error = mdstart_swap(sc, bp); 610 break; 611 default: 612 panic("Impossible md(type)"); 613 break; 614 } 615 616 if (error != -1) { 617 bp->bio_completed = bp->bio_length; 618 g_io_deliver(bp, error); 619 } 620 } 621 } 622 623 static struct md_s * 624 mdfind(int unit) 625 { 626 struct md_s *sc; 627 628 /* XXX: LOCK(unique unit numbers) */ 629 LIST_FOREACH(sc, &md_softc_list, list) { 630 if (sc->unit == unit) 631 break; 632 } 633 /* XXX: UNLOCK(unique unit numbers) */ 634 return (sc); 635 } 636 637 static struct md_s * 638 mdnew(int unit) 639 { 640 struct md_s *sc; 641 int error, max = -1; 642 643 /* XXX: LOCK(unique unit numbers) */ 644 LIST_FOREACH(sc, &md_softc_list, list) { 645 if (sc->unit == unit) { 646 /* XXX: UNLOCK(unique unit numbers) */ 647 return (NULL); 648 } 649 if (sc->unit > max) 650 max = sc->unit; 651 } 652 if (unit == -1) 653 unit = max + 1; 654 if (unit > 255) 655 return (NULL); 656 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 657 sc->unit = unit; 658 bioq_init(&sc->bio_queue); 659 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 660 sprintf(sc->name, "md%d", unit); 661 error = kthread_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 662 if (error) { 663 free(sc, M_MD); 664 return (NULL); 665 } 666 LIST_INSERT_HEAD(&md_softc_list, sc, list); 667 /* XXX: UNLOCK(unique unit numbers) */ 668 return (sc); 669 } 670 671 static void 672 mdinit(struct md_s *sc) 673 { 674 675 devstat_add_entry(&sc->stats, MD_NAME, sc->unit, sc->secsize, 676 DEVSTAT_NO_ORDERED_TAGS, 677 DEVSTAT_TYPE_DIRECT | DEVSTAT_TYPE_IF_OTHER, 678 DEVSTAT_PRIORITY_OTHER); 679 { 680 struct g_geom *gp; 681 struct g_provider *pp; 682 683 DROP_GIANT(); 684 g_topology_lock(); 685 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 686 gp->start = g_md_start; 687 gp->access = g_md_access; 688 gp->softc = sc; 689 pp = g_new_providerf(gp, "md%d", sc->unit); 690 pp->mediasize = (off_t)sc->nsect * sc->secsize; 691 pp->sectorsize = sc->secsize; 692 sc->gp = gp; 693 sc->pp = pp; 694 g_error_provider(pp, 0); 695 g_topology_unlock(); 696 PICKUP_GIANT(); 697 } 698 } 699 700 /* 701 * XXX: we should check that the range they feed us is mapped. 702 * XXX: we should implement read-only. 703 */ 704 705 static int 706 mdcreate_preload(struct md_ioctl *mdio) 707 { 708 struct md_s *sc; 709 710 if (mdio->md_size == 0) 711 return (EINVAL); 712 if (mdio->md_options & ~(MD_AUTOUNIT)) 713 return (EINVAL); 714 if (mdio->md_options & MD_AUTOUNIT) { 715 sc = mdnew(-1); 716 if (sc == NULL) 717 return (ENOMEM); 718 mdio->md_unit = sc->unit; 719 } else { 720 sc = mdnew(mdio->md_unit); 721 if (sc == NULL) 722 return (EBUSY); 723 } 724 sc->type = MD_PRELOAD; 725 sc->secsize = DEV_BSIZE; 726 sc->nsect = mdio->md_size; 727 sc->flags = mdio->md_options & MD_FORCE; 728 /* Cast to pointer size, then to pointer to avoid warning */ 729 sc->pl_ptr = (u_char *)(uintptr_t)mdio->md_base; 730 sc->pl_len = (mdio->md_size << DEV_BSHIFT); 731 mdinit(sc); 732 return (0); 733 } 734 735 736 static int 737 mdcreate_malloc(struct md_ioctl *mdio) 738 { 739 struct md_s *sc; 740 off_t u; 741 uintptr_t sp; 742 int error; 743 744 error = 0; 745 if (mdio->md_size == 0) 746 return (EINVAL); 747 if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 748 return (EINVAL); 749 if (mdio->md_secsize != 0 && !powerof2(mdio->md_secsize)) 750 return (EINVAL); 751 /* Compression doesn't make sense if we have reserved space */ 752 if (mdio->md_options & MD_RESERVE) 753 mdio->md_options &= ~MD_COMPRESS; 754 if (mdio->md_options & MD_AUTOUNIT) { 755 sc = mdnew(-1); 756 if (sc == NULL) 757 return (ENOMEM); 758 mdio->md_unit = sc->unit; 759 } else { 760 sc = mdnew(mdio->md_unit); 761 if (sc == NULL) 762 return (EBUSY); 763 } 764 sc->type = MD_MALLOC; 765 if (mdio->md_secsize != 0) 766 sc->secsize = mdio->md_secsize; 767 else 768 sc->secsize = DEV_BSIZE; 769 sc->nsect = mdio->md_size; 770 sc->nsect /= (sc->secsize / DEV_BSIZE); 771 sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE); 772 sc->indir = dimension(sc->nsect); 773 sc->uma = uma_zcreate(sc->name, sc->secsize, 774 NULL, NULL, NULL, NULL, 0x1ff, 0); 775 if (mdio->md_options & MD_RESERVE) { 776 for (u = 0; u < sc->nsect; u++) { 777 sp = (uintptr_t) uma_zalloc(sc->uma, M_NOWAIT | M_ZERO); 778 if (sp != 0) 779 error = s_write(sc->indir, u, sp); 780 else 781 error = ENOMEM; 782 if (error) 783 break; 784 } 785 } 786 if (error) { 787 mddestroy(sc, NULL); 788 return (error); 789 } 790 mdinit(sc); 791 if (!(mdio->md_options & MD_RESERVE)) 792 sc->pp->flags |= G_PF_CANDELETE; 793 return (0); 794 } 795 796 797 static int 798 mdsetcred(struct md_s *sc, struct ucred *cred) 799 { 800 char *tmpbuf; 801 int error = 0; 802 803 /* 804 * Set credits in our softc 805 */ 806 807 if (sc->cred) 808 crfree(sc->cred); 809 sc->cred = crhold(cred); 810 811 /* 812 * Horrible kludge to establish credentials for NFS XXX. 813 */ 814 815 if (sc->vnode) { 816 struct uio auio; 817 struct iovec aiov; 818 819 tmpbuf = malloc(sc->secsize, M_TEMP, M_WAITOK); 820 bzero(&auio, sizeof(auio)); 821 822 aiov.iov_base = tmpbuf; 823 aiov.iov_len = sc->secsize; 824 auio.uio_iov = &aiov; 825 auio.uio_iovcnt = 1; 826 auio.uio_offset = 0; 827 auio.uio_rw = UIO_READ; 828 auio.uio_segflg = UIO_SYSSPACE; 829 auio.uio_resid = aiov.iov_len; 830 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 831 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 832 VOP_UNLOCK(sc->vnode, 0, curthread); 833 free(tmpbuf, M_TEMP); 834 } 835 return (error); 836 } 837 838 static int 839 mdcreate_vnode(struct md_ioctl *mdio, struct thread *td) 840 { 841 struct md_s *sc; 842 struct vattr vattr; 843 struct nameidata nd; 844 int error, flags; 845 846 flags = FREAD|FWRITE; 847 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 848 error = vn_open(&nd, &flags, 0); 849 if (error) { 850 if (error != EACCES && error != EPERM && error != EROFS) 851 return (error); 852 flags &= ~FWRITE; 853 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 854 error = vn_open(&nd, &flags, 0); 855 if (error) 856 return (error); 857 } 858 NDFREE(&nd, NDF_ONLY_PNBUF); 859 if (nd.ni_vp->v_type != VREG || 860 (error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred, td))) { 861 VOP_UNLOCK(nd.ni_vp, 0, td); 862 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 863 return (error ? error : EINVAL); 864 } 865 VOP_UNLOCK(nd.ni_vp, 0, td); 866 867 if (mdio->md_options & MD_AUTOUNIT) { 868 sc = mdnew(-1); 869 mdio->md_unit = sc->unit; 870 } else { 871 sc = mdnew(mdio->md_unit); 872 } 873 if (sc == NULL) { 874 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 875 return (EBUSY); 876 } 877 878 sc->type = MD_VNODE; 879 sc->flags = mdio->md_options & MD_FORCE; 880 if (!(flags & FWRITE)) 881 sc->flags |= MD_READONLY; 882 sc->secsize = DEV_BSIZE; 883 sc->vnode = nd.ni_vp; 884 885 /* 886 * If the size is specified, override the file attributes. 887 */ 888 if (mdio->md_size) 889 sc->nsect = mdio->md_size; 890 else 891 sc->nsect = vattr.va_size / sc->secsize; /* XXX: round up ? */ 892 if (sc->nsect == 0) { 893 mddestroy(sc, td); 894 return (EINVAL); 895 } 896 error = mdsetcred(sc, td->td_ucred); 897 if (error) { 898 mddestroy(sc, td); 899 return (error); 900 } 901 mdinit(sc); 902 return (0); 903 } 904 905 static int 906 mddestroy(struct md_s *sc, struct thread *td) 907 { 908 909 GIANT_REQUIRED; 910 911 mtx_destroy(&sc->queue_mtx); 912 devstat_remove_entry(&sc->stats); 913 { 914 if (sc->gp) { 915 sc->gp->flags |= G_GEOM_WITHER; 916 sc->gp->softc = NULL; 917 } 918 if (sc->pp) 919 g_orphan_provider(sc->pp, ENXIO); 920 } 921 sc->flags |= MD_SHUTDOWN; 922 wakeup(sc); 923 while (sc->procp != NULL) 924 tsleep(&sc->procp, PRIBIO, "mddestroy", hz / 10); 925 if (sc->vnode != NULL) 926 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 927 FREAD : (FREAD|FWRITE), sc->cred, td); 928 if (sc->cred != NULL) 929 crfree(sc->cred); 930 if (sc->object != NULL) { 931 vm_pager_deallocate(sc->object); 932 } 933 if (sc->indir) 934 destroy_indir(sc, sc->indir); 935 if (sc->uma) 936 uma_zdestroy(sc->uma); 937 938 /* XXX: LOCK(unique unit numbers) */ 939 LIST_REMOVE(sc, list); 940 /* XXX: UNLOCK(unique unit numbers) */ 941 free(sc, M_MD); 942 return (0); 943 } 944 945 static int 946 mdcreate_swap(struct md_ioctl *mdio, struct thread *td) 947 { 948 int error; 949 struct md_s *sc; 950 951 GIANT_REQUIRED; 952 953 if (mdio->md_options & MD_AUTOUNIT) { 954 sc = mdnew(-1); 955 mdio->md_unit = sc->unit; 956 } else { 957 sc = mdnew(mdio->md_unit); 958 } 959 if (sc == NULL) 960 return (EBUSY); 961 962 sc->type = MD_SWAP; 963 964 /* 965 * Range check. Disallow negative sizes or any size less then the 966 * size of a page. Then round to a page. 967 */ 968 969 if (mdio->md_size == 0) { 970 mddestroy(sc, td); 971 return (EDOM); 972 } 973 974 /* 975 * Allocate an OBJT_SWAP object. 976 * 977 * sc_secsize is PAGE_SIZE'd 978 * 979 * mdio->size is in DEV_BSIZE'd chunks. 980 * Note the truncation. 981 */ 982 983 sc->secsize = PAGE_SIZE; 984 sc->nsect = mdio->md_size / (PAGE_SIZE / DEV_BSIZE); 985 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, sc->secsize * (vm_offset_t)sc->nsect, VM_PROT_DEFAULT, 0); 986 sc->flags = mdio->md_options & MD_FORCE; 987 if (mdio->md_options & MD_RESERVE) { 988 if (swap_pager_reserve(sc->object, 0, sc->nsect) < 0) { 989 vm_pager_deallocate(sc->object); 990 sc->object = NULL; 991 mddestroy(sc, td); 992 return (EDOM); 993 } 994 } 995 error = mdsetcred(sc, td->td_ucred); 996 if (error) { 997 mddestroy(sc, td); 998 return (error); 999 } 1000 mdinit(sc); 1001 if (!(mdio->md_options & MD_RESERVE)) 1002 sc->pp->flags |= G_PF_CANDELETE; 1003 return (0); 1004 } 1005 1006 static int 1007 mddetach(int unit, struct thread *td) 1008 { 1009 struct md_s *sc; 1010 1011 sc = mdfind(unit); 1012 if (sc == NULL) 1013 return (ENOENT); 1014 if (sc->opencount != 0 && !(sc->flags & MD_FORCE)) 1015 return (EBUSY); 1016 switch(sc->type) { 1017 case MD_VNODE: 1018 case MD_SWAP: 1019 case MD_MALLOC: 1020 case MD_PRELOAD: 1021 return (mddestroy(sc, td)); 1022 default: 1023 return (EOPNOTSUPP); 1024 } 1025 } 1026 1027 static int 1028 mdctlioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 1029 { 1030 struct md_ioctl *mdio; 1031 struct md_s *sc; 1032 int i; 1033 1034 if (md_debug) 1035 printf("mdctlioctl(%s %lx %p %x %p)\n", 1036 devtoname(dev), cmd, addr, flags, td); 1037 1038 /* 1039 * We assert the version number in the individual ioctl 1040 * handlers instead of out here because (a) it is possible we 1041 * may add another ioctl in the future which doesn't read an 1042 * mdio, and (b) the correct return value for an unknown ioctl 1043 * is ENOIOCTL, not EINVAL. 1044 */ 1045 mdio = (struct md_ioctl *)addr; 1046 switch (cmd) { 1047 case MDIOCATTACH: 1048 if (mdio->md_version != MDIOVERSION) 1049 return (EINVAL); 1050 switch (mdio->md_type) { 1051 case MD_MALLOC: 1052 return (mdcreate_malloc(mdio)); 1053 case MD_PRELOAD: 1054 return (mdcreate_preload(mdio)); 1055 case MD_VNODE: 1056 return (mdcreate_vnode(mdio, td)); 1057 case MD_SWAP: 1058 return (mdcreate_swap(mdio, td)); 1059 default: 1060 return (EINVAL); 1061 } 1062 case MDIOCDETACH: 1063 if (mdio->md_version != MDIOVERSION) 1064 return (EINVAL); 1065 if (mdio->md_file != NULL || mdio->md_size != 0 || 1066 mdio->md_options != 0) 1067 return (EINVAL); 1068 return (mddetach(mdio->md_unit, td)); 1069 case MDIOCQUERY: 1070 if (mdio->md_version != MDIOVERSION) 1071 return (EINVAL); 1072 sc = mdfind(mdio->md_unit); 1073 if (sc == NULL) 1074 return (ENOENT); 1075 mdio->md_type = sc->type; 1076 mdio->md_options = sc->flags; 1077 switch (sc->type) { 1078 case MD_MALLOC: 1079 mdio->md_size = sc->nsect; 1080 break; 1081 case MD_PRELOAD: 1082 mdio->md_size = sc->nsect; 1083 mdio->md_base = (uint64_t)(intptr_t)sc->pl_ptr; 1084 break; 1085 case MD_SWAP: 1086 mdio->md_size = sc->nsect * (PAGE_SIZE / DEV_BSIZE); 1087 break; 1088 case MD_VNODE: 1089 mdio->md_size = sc->nsect; 1090 /* XXX fill this in */ 1091 mdio->md_file = NULL; 1092 break; 1093 } 1094 return (0); 1095 case MDIOCLIST: 1096 i = 1; 1097 LIST_FOREACH(sc, &md_softc_list, list) { 1098 if (i == MDNPAD - 1) 1099 mdio->md_pad[i] = -1; 1100 else 1101 mdio->md_pad[i++] = sc->unit; 1102 } 1103 mdio->md_pad[0] = i - 1; 1104 return (0); 1105 default: 1106 return (ENOIOCTL); 1107 }; 1108 return (ENOIOCTL); 1109 } 1110 1111 static void 1112 md_preloaded(u_char *image, unsigned length) 1113 { 1114 struct md_s *sc; 1115 1116 sc = mdnew(-1); 1117 if (sc == NULL) 1118 return; 1119 sc->type = MD_PRELOAD; 1120 sc->secsize = DEV_BSIZE; 1121 sc->nsect = length / DEV_BSIZE; 1122 sc->pl_ptr = image; 1123 sc->pl_len = length; 1124 if (sc->unit == 0) 1125 mdrootready = 1; 1126 mdinit(sc); 1127 } 1128 1129 static void 1130 md_drvinit(void *unused) 1131 { 1132 1133 caddr_t mod; 1134 caddr_t c; 1135 u_char *ptr, *name, *type; 1136 unsigned len; 1137 1138 #ifdef MD_ROOT_SIZE 1139 md_preloaded(mfs_root, MD_ROOT_SIZE*1024); 1140 #endif 1141 mod = NULL; 1142 while ((mod = preload_search_next_name(mod)) != NULL) { 1143 name = (char *)preload_search_info(mod, MODINFO_NAME); 1144 type = (char *)preload_search_info(mod, MODINFO_TYPE); 1145 if (name == NULL) 1146 continue; 1147 if (type == NULL) 1148 continue; 1149 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 1150 continue; 1151 c = preload_search_info(mod, MODINFO_ADDR); 1152 ptr = *(u_char **)c; 1153 c = preload_search_info(mod, MODINFO_SIZE); 1154 len = *(size_t *)c; 1155 printf("%s%d: Preloaded image <%s> %d bytes at %p\n", 1156 MD_NAME, mdunits, name, len, ptr); 1157 md_preloaded(ptr, len); 1158 } 1159 status_dev = make_dev(&mdctl_cdevsw, 0xffff00ff, UID_ROOT, GID_WHEEL, 1160 0600, MDCTL_NAME); 1161 } 1162 1163 static int 1164 md_modevent(module_t mod, int type, void *data) 1165 { 1166 int error; 1167 struct md_s *sc; 1168 1169 switch (type) { 1170 case MOD_LOAD: 1171 md_drvinit(NULL); 1172 break; 1173 case MOD_UNLOAD: 1174 LIST_FOREACH(sc, &md_softc_list, list) { 1175 error = mddetach(sc->unit, curthread); 1176 if (error != 0) 1177 return (error); 1178 } 1179 if (status_dev) 1180 destroy_dev(status_dev); 1181 status_dev = 0; 1182 break; 1183 default: 1184 break; 1185 } 1186 return (0); 1187 } 1188 1189 static moduledata_t md_mod = { 1190 MD_NAME, 1191 md_modevent, 1192 NULL 1193 }; 1194 DECLARE_MODULE(md, md_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE+CDEV_MAJOR); 1195 MODULE_VERSION(md, MD_MODVER); 1196 1197 1198 #ifdef MD_ROOT 1199 static void 1200 md_takeroot(void *junk) 1201 { 1202 if (mdrootready) 1203 rootdevnames[0] = "ufs:/dev/md0"; 1204 } 1205 1206 SYSINIT(md_root, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, md_takeroot, NULL); 1207 #endif /* MD_ROOT */ 1208