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 * 4. Neither the name of the University nor the names of its contributors 35 * may be used to endorse or promote products derived from this software 36 * without specific prior written permission. 37 * 38 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 39 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 41 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 42 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 43 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 44 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 45 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 46 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 47 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 48 * SUCH DAMAGE. 49 * 50 * from: Utah Hdr: vn.c 1.13 94/04/02 51 * 52 * from: @(#)vn.c 8.6 (Berkeley) 4/1/94 53 * From: src/sys/dev/vn/vn.c,v 1.122 2000/12/16 16:06:03 54 */ 55 56 #include "opt_geom.h" 57 #include "opt_md.h" 58 59 #include <sys/param.h> 60 #include <sys/systm.h> 61 #include <sys/bio.h> 62 #include <sys/conf.h> 63 #include <sys/fcntl.h> 64 #include <sys/kernel.h> 65 #include <sys/kthread.h> 66 #include <sys/linker.h> 67 #include <sys/lock.h> 68 #include <sys/malloc.h> 69 #include <sys/mdioctl.h> 70 #include <sys/mutex.h> 71 #include <sys/namei.h> 72 #include <sys/proc.h> 73 #include <sys/queue.h> 74 #include <sys/sf_buf.h> 75 #include <sys/sysctl.h> 76 #include <sys/vnode.h> 77 78 #include <geom/geom.h> 79 80 #include <vm/vm.h> 81 #include <vm/vm_object.h> 82 #include <vm/vm_page.h> 83 #include <vm/vm_pager.h> 84 #include <vm/swap_pager.h> 85 #include <vm/uma.h> 86 87 #define MD_MODVER 1 88 89 #define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */ 90 91 #ifndef MD_NSECT 92 #define MD_NSECT (10000 * 2) 93 #endif 94 95 static MALLOC_DEFINE(M_MD, "MD disk", "Memory Disk"); 96 static MALLOC_DEFINE(M_MDSECT, "MD sectors", "Memory Disk Sectors"); 97 98 static int md_debug; 99 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, ""); 100 101 #if defined(MD_ROOT) && defined(MD_ROOT_SIZE) 102 /* Image gets put here: */ 103 static u_char mfs_root[MD_ROOT_SIZE*1024] = "MFS Filesystem goes here"; 104 static u_char end_mfs_root[] __unused = "MFS Filesystem had better STOP here"; 105 #endif 106 107 static g_init_t g_md_init; 108 static g_fini_t g_md_fini; 109 static g_start_t g_md_start; 110 static g_access_t g_md_access; 111 112 static int mdunits; 113 static struct cdev *status_dev = 0; 114 115 static d_ioctl_t mdctlioctl; 116 117 static struct cdevsw mdctl_cdevsw = { 118 .d_version = D_VERSION, 119 .d_flags = D_NEEDGIANT, 120 .d_ioctl = mdctlioctl, 121 .d_name = MD_NAME, 122 }; 123 124 struct g_class g_md_class = { 125 .name = "MD", 126 .version = G_VERSION, 127 .init = g_md_init, 128 .fini = g_md_fini, 129 .start = g_md_start, 130 .access = g_md_access, 131 }; 132 133 DECLARE_GEOM_CLASS(g_md_class, g_md); 134 135 136 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(&md_softc_list); 137 138 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 139 #define NMASK (NINDIR-1) 140 static int nshift; 141 142 struct indir { 143 uintptr_t *array; 144 u_int total; 145 u_int used; 146 u_int shift; 147 }; 148 149 struct md_s { 150 int unit; 151 LIST_ENTRY(md_s) list; 152 struct bio_queue_head bio_queue; 153 struct mtx queue_mtx; 154 struct cdev *dev; 155 enum md_types type; 156 off_t mediasize; 157 unsigned sectorsize; 158 unsigned opencount; 159 unsigned fwheads; 160 unsigned fwsectors; 161 unsigned flags; 162 char name[20]; 163 struct proc *procp; 164 struct g_geom *gp; 165 struct g_provider *pp; 166 167 /* MD_MALLOC related fields */ 168 struct indir *indir; 169 uma_zone_t uma; 170 171 /* MD_PRELOAD related fields */ 172 u_char *pl_ptr; 173 size_t pl_len; 174 175 /* MD_VNODE related fields */ 176 struct vnode *vnode; 177 struct ucred *cred; 178 179 /* MD_SWAP related fields */ 180 vm_object_t object; 181 }; 182 183 static int mddestroy(struct md_s *sc, struct thread *td); 184 185 static struct indir * 186 new_indir(u_int shift) 187 { 188 struct indir *ip; 189 190 ip = malloc(sizeof *ip, M_MD, M_NOWAIT | M_ZERO); 191 if (ip == NULL) 192 return (NULL); 193 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 194 M_MDSECT, M_NOWAIT | M_ZERO); 195 if (ip->array == NULL) { 196 free(ip, M_MD); 197 return (NULL); 198 } 199 ip->total = NINDIR; 200 ip->shift = shift; 201 return (ip); 202 } 203 204 static void 205 del_indir(struct indir *ip) 206 { 207 208 free(ip->array, M_MDSECT); 209 free(ip, M_MD); 210 } 211 212 static void 213 destroy_indir(struct md_s *sc, struct indir *ip) 214 { 215 int i; 216 217 for (i = 0; i < NINDIR; i++) { 218 if (!ip->array[i]) 219 continue; 220 if (ip->shift) 221 destroy_indir(sc, (struct indir*)(ip->array[i])); 222 else if (ip->array[i] > 255) 223 uma_zfree(sc->uma, (void *)(ip->array[i])); 224 } 225 del_indir(ip); 226 } 227 228 /* 229 * This function does the math and alloctes the top level "indir" structure 230 * for a device of "size" sectors. 231 */ 232 233 static struct indir * 234 dimension(off_t size) 235 { 236 off_t rcnt; 237 struct indir *ip; 238 int i, layer; 239 240 rcnt = size; 241 layer = 0; 242 while (rcnt > NINDIR) { 243 rcnt /= NINDIR; 244 layer++; 245 } 246 /* figure out log2(NINDIR) */ 247 for (i = NINDIR, nshift = -1; i; nshift++) 248 i >>= 1; 249 250 /* 251 * XXX: the top layer is probably not fully populated, so we allocate 252 * too much space for ip->array in here. 253 */ 254 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO); 255 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 256 M_MDSECT, M_WAITOK | M_ZERO); 257 ip->total = NINDIR; 258 ip->shift = layer * nshift; 259 return (ip); 260 } 261 262 /* 263 * Read a given sector 264 */ 265 266 static uintptr_t 267 s_read(struct indir *ip, off_t offset) 268 { 269 struct indir *cip; 270 int idx; 271 uintptr_t up; 272 273 if (md_debug > 1) 274 printf("s_read(%jd)\n", (intmax_t)offset); 275 up = 0; 276 for (cip = ip; cip != NULL;) { 277 if (cip->shift) { 278 idx = (offset >> cip->shift) & NMASK; 279 up = cip->array[idx]; 280 cip = (struct indir *)up; 281 continue; 282 } 283 idx = offset & NMASK; 284 return (cip->array[idx]); 285 } 286 return (0); 287 } 288 289 /* 290 * Write a given sector, prune the tree if the value is 0 291 */ 292 293 static int 294 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 295 { 296 struct indir *cip, *lip[10]; 297 int idx, li; 298 uintptr_t up; 299 300 if (md_debug > 1) 301 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 302 up = 0; 303 li = 0; 304 cip = ip; 305 for (;;) { 306 lip[li++] = cip; 307 if (cip->shift) { 308 idx = (offset >> cip->shift) & NMASK; 309 up = cip->array[idx]; 310 if (up != 0) { 311 cip = (struct indir *)up; 312 continue; 313 } 314 /* Allocate branch */ 315 cip->array[idx] = 316 (uintptr_t)new_indir(cip->shift - nshift); 317 if (cip->array[idx] == 0) 318 return (ENOSPC); 319 cip->used++; 320 up = cip->array[idx]; 321 cip = (struct indir *)up; 322 continue; 323 } 324 /* leafnode */ 325 idx = offset & NMASK; 326 up = cip->array[idx]; 327 if (up != 0) 328 cip->used--; 329 cip->array[idx] = ptr; 330 if (ptr != 0) 331 cip->used++; 332 break; 333 } 334 if (cip->used != 0 || li == 1) 335 return (0); 336 li--; 337 while (cip->used == 0 && cip != ip) { 338 li--; 339 idx = (offset >> lip[li]->shift) & NMASK; 340 up = lip[li]->array[idx]; 341 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 342 del_indir(cip); 343 lip[li]->array[idx] = 0; 344 lip[li]->used--; 345 cip = lip[li]; 346 } 347 return (0); 348 } 349 350 351 static int 352 g_md_access(struct g_provider *pp, int r, int w, int e) 353 { 354 struct md_s *sc; 355 356 sc = pp->geom->softc; 357 if (sc == NULL) 358 return (ENXIO); 359 r += pp->acr; 360 w += pp->acw; 361 e += pp->ace; 362 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 363 sc->opencount = 1; 364 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 365 sc->opencount = 0; 366 } 367 return (0); 368 } 369 370 static void 371 g_md_start(struct bio *bp) 372 { 373 struct md_s *sc; 374 375 sc = bp->bio_to->geom->softc; 376 mtx_lock(&sc->queue_mtx); 377 bioq_disksort(&sc->bio_queue, bp); 378 mtx_unlock(&sc->queue_mtx); 379 wakeup(sc); 380 } 381 382 383 384 static int 385 mdstart_malloc(struct md_s *sc, struct bio *bp) 386 { 387 int i, error; 388 u_char *dst; 389 off_t secno, nsec, uc; 390 uintptr_t sp, osp; 391 392 nsec = bp->bio_length / sc->sectorsize; 393 secno = bp->bio_offset / sc->sectorsize; 394 dst = bp->bio_data; 395 error = 0; 396 while (nsec--) { 397 osp = s_read(sc->indir, secno); 398 if (bp->bio_cmd == BIO_DELETE) { 399 if (osp != 0) 400 error = s_write(sc->indir, secno, 0); 401 } else if (bp->bio_cmd == BIO_READ) { 402 if (osp == 0) 403 bzero(dst, sc->sectorsize); 404 else if (osp <= 255) 405 for (i = 0; i < sc->sectorsize; i++) 406 dst[i] = osp; 407 else 408 bcopy((void *)osp, dst, sc->sectorsize); 409 osp = 0; 410 } else if (bp->bio_cmd == BIO_WRITE) { 411 if (sc->flags & MD_COMPRESS) { 412 uc = dst[0]; 413 for (i = 1; i < sc->sectorsize; i++) 414 if (dst[i] != uc) 415 break; 416 } else { 417 i = 0; 418 uc = 0; 419 } 420 if (i == sc->sectorsize) { 421 if (osp != uc) 422 error = s_write(sc->indir, secno, uc); 423 } else { 424 if (osp <= 255) { 425 sp = (uintptr_t)uma_zalloc(sc->uma, 426 M_NOWAIT); 427 if (sp == 0) { 428 error = ENOSPC; 429 break; 430 } 431 bcopy(dst, (void *)sp, sc->sectorsize); 432 error = s_write(sc->indir, secno, sp); 433 } else { 434 bcopy(dst, (void *)osp, sc->sectorsize); 435 osp = 0; 436 } 437 } 438 } else { 439 error = EOPNOTSUPP; 440 } 441 if (osp > 255) 442 uma_zfree(sc->uma, (void*)osp); 443 if (error) 444 break; 445 secno++; 446 dst += sc->sectorsize; 447 } 448 bp->bio_resid = 0; 449 return (error); 450 } 451 452 static int 453 mdstart_preload(struct md_s *sc, struct bio *bp) 454 { 455 456 switch (bp->bio_cmd) { 457 case BIO_READ: 458 bcopy(sc->pl_ptr + bp->bio_offset, bp->bio_data, 459 bp->bio_length); 460 break; 461 case BIO_WRITE: 462 bcopy(bp->bio_data, sc->pl_ptr + bp->bio_offset, 463 bp->bio_length); 464 break; 465 } 466 bp->bio_resid = 0; 467 return (0); 468 } 469 470 static int 471 mdstart_vnode(struct md_s *sc, struct bio *bp) 472 { 473 int error; 474 struct uio auio; 475 struct iovec aiov; 476 struct mount *mp; 477 478 /* 479 * VNODE I/O 480 * 481 * If an error occurs, we set BIO_ERROR but we do not set 482 * B_INVAL because (for a write anyway), the buffer is 483 * still valid. 484 */ 485 486 bzero(&auio, sizeof(auio)); 487 488 aiov.iov_base = bp->bio_data; 489 aiov.iov_len = bp->bio_length; 490 auio.uio_iov = &aiov; 491 auio.uio_iovcnt = 1; 492 auio.uio_offset = (vm_ooffset_t)bp->bio_offset; 493 auio.uio_segflg = UIO_SYSSPACE; 494 if(bp->bio_cmd == BIO_READ) 495 auio.uio_rw = UIO_READ; 496 else if(bp->bio_cmd == BIO_WRITE) 497 auio.uio_rw = UIO_WRITE; 498 else 499 panic("wrong BIO_OP in mdstart_vnode"); 500 auio.uio_resid = bp->bio_length; 501 auio.uio_td = curthread; 502 /* 503 * When reading set IO_DIRECT to try to avoid double-caching 504 * the data. When writing IO_DIRECT is not optimal. 505 */ 506 if (bp->bio_cmd == BIO_READ) { 507 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 508 error = VOP_READ(sc->vnode, &auio, IO_DIRECT, sc->cred); 509 VOP_UNLOCK(sc->vnode, 0, curthread); 510 } else { 511 (void) vn_start_write(sc->vnode, &mp, V_WAIT); 512 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 513 error = VOP_WRITE(sc->vnode, &auio, 514 sc->flags & MD_ASYNC ? 0 : IO_SYNC, sc->cred); 515 VOP_UNLOCK(sc->vnode, 0, curthread); 516 vn_finished_write(mp); 517 } 518 bp->bio_resid = auio.uio_resid; 519 return (error); 520 } 521 522 static int 523 mdstart_swap(struct md_s *sc, struct bio *bp) 524 { 525 struct sf_buf *sf; 526 int rv, offs, len, lastend; 527 vm_pindex_t i, lastp; 528 vm_page_t m; 529 u_char *p; 530 531 p = bp->bio_data; 532 533 /* 534 * offs is the ofset at whih to start operating on the 535 * next (ie, first) page. lastp is the last page on 536 * which we're going to operate. lastend is the ending 537 * position within that last page (ie, PAGE_SIZE if 538 * we're operating on complete aligned pages). 539 */ 540 offs = bp->bio_offset % PAGE_SIZE; 541 lastp = (bp->bio_offset + bp->bio_length - 1) / PAGE_SIZE; 542 lastend = (bp->bio_offset + bp->bio_length - 1) % PAGE_SIZE + 1; 543 544 rv = VM_PAGER_OK; 545 VM_OBJECT_LOCK(sc->object); 546 vm_object_pip_add(sc->object, 1); 547 for (i = bp->bio_offset / PAGE_SIZE; i <= lastp; i++) { 548 len = ((i == lastp) ? lastend : PAGE_SIZE) - offs; 549 550 m = vm_page_grab(sc->object, i, 551 VM_ALLOC_NORMAL|VM_ALLOC_RETRY); 552 VM_OBJECT_UNLOCK(sc->object); 553 sf = sf_buf_alloc(m, 0); 554 VM_OBJECT_LOCK(sc->object); 555 if (bp->bio_cmd == BIO_READ) { 556 if (m->valid != VM_PAGE_BITS_ALL) 557 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 558 if (rv == VM_PAGER_ERROR) { 559 sf_buf_free(sf); 560 vm_page_wakeup(m); 561 break; 562 } 563 bcopy((void *)(sf_buf_kva(sf) + offs), p, len); 564 } else if (bp->bio_cmd == BIO_WRITE) { 565 if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL) 566 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 567 if (rv == VM_PAGER_ERROR) { 568 sf_buf_free(sf); 569 vm_page_wakeup(m); 570 break; 571 } 572 bcopy(p, (void *)(sf_buf_kva(sf) + offs), len); 573 m->valid = VM_PAGE_BITS_ALL; 574 #if 0 575 } else if (bp->bio_cmd == BIO_DELETE) { 576 if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL) 577 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 578 if (rv == VM_PAGER_ERROR) { 579 sf_buf_free(sf); 580 vm_page_wakeup(m); 581 break; 582 } 583 bzero((void *)(sf_buf_kva(sf) + offs), len); 584 vm_page_dirty(m); 585 m->valid = VM_PAGE_BITS_ALL; 586 #endif 587 } 588 sf_buf_free(sf); 589 vm_page_lock_queues(); 590 vm_page_wakeup(m); 591 vm_page_activate(m); 592 if (bp->bio_cmd == BIO_WRITE) 593 vm_page_dirty(m); 594 vm_page_unlock_queues(); 595 596 /* Actions on further pages start at offset 0 */ 597 p += PAGE_SIZE - offs; 598 offs = 0; 599 #if 0 600 if (bootverbose || bp->bio_offset / PAGE_SIZE < 17) 601 printf("wire_count %d busy %d flags %x hold_count %d act_count %d queue %d valid %d dirty %d @ %d\n", 602 m->wire_count, m->busy, 603 m->flags, m->hold_count, m->act_count, m->queue, m->valid, m->dirty, i); 604 #endif 605 } 606 vm_object_pip_subtract(sc->object, 1); 607 vm_object_set_writeable_dirty(sc->object); 608 VM_OBJECT_UNLOCK(sc->object); 609 return (rv != VM_PAGER_ERROR ? 0 : ENOSPC); 610 } 611 612 static void 613 md_kthread(void *arg) 614 { 615 struct md_s *sc; 616 struct bio *bp; 617 int error, hasgiant; 618 619 sc = arg; 620 curthread->td_base_pri = PRIBIO; 621 622 switch (sc->type) { 623 case MD_VNODE: 624 mtx_lock(&Giant); 625 hasgiant = 1; 626 break; 627 case MD_MALLOC: 628 case MD_PRELOAD: 629 case MD_SWAP: 630 default: 631 hasgiant = 0; 632 break; 633 } 634 635 for (;;) { 636 mtx_lock(&sc->queue_mtx); 637 bp = bioq_takefirst(&sc->bio_queue); 638 if (!bp) { 639 if (sc->flags & MD_SHUTDOWN) { 640 mtx_unlock(&sc->queue_mtx); 641 sc->procp = NULL; 642 wakeup(&sc->procp); 643 if (hasgiant) 644 mtx_unlock(&Giant); 645 kthread_exit(0); 646 } 647 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 648 continue; 649 } 650 mtx_unlock(&sc->queue_mtx); 651 if (bp->bio_cmd == BIO_GETATTR) { 652 if (sc->fwsectors && sc->fwheads && 653 (g_handleattr_int(bp, "GEOM::fwsectors", 654 sc->fwsectors) || 655 g_handleattr_int(bp, "GEOM::fwheads", 656 sc->fwheads))) 657 error = -1; 658 else 659 error = EOPNOTSUPP; 660 } else { 661 switch (sc->type) { 662 case MD_MALLOC: 663 error = mdstart_malloc(sc, bp); 664 break; 665 case MD_PRELOAD: 666 error = mdstart_preload(sc, bp); 667 break; 668 case MD_VNODE: 669 error = mdstart_vnode(sc, bp); 670 break; 671 case MD_SWAP: 672 error = mdstart_swap(sc, bp); 673 break; 674 default: 675 panic("Impossible md(type)"); 676 break; 677 } 678 } 679 680 if (error != -1) { 681 bp->bio_completed = bp->bio_length; 682 g_io_deliver(bp, error); 683 } 684 } 685 } 686 687 static struct md_s * 688 mdfind(int unit) 689 { 690 struct md_s *sc; 691 692 /* XXX: LOCK(unique unit numbers) */ 693 LIST_FOREACH(sc, &md_softc_list, list) { 694 if (sc->unit == unit) 695 break; 696 } 697 /* XXX: UNLOCK(unique unit numbers) */ 698 return (sc); 699 } 700 701 static struct md_s * 702 mdnew(int unit) 703 { 704 struct md_s *sc; 705 int error, max = -1; 706 707 /* XXX: LOCK(unique unit numbers) */ 708 LIST_FOREACH(sc, &md_softc_list, list) { 709 if (sc->unit == unit) { 710 /* XXX: UNLOCK(unique unit numbers) */ 711 return (NULL); 712 } 713 if (sc->unit > max) 714 max = sc->unit; 715 } 716 if (unit == -1) 717 unit = max + 1; 718 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 719 sc->unit = unit; 720 bioq_init(&sc->bio_queue); 721 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 722 sprintf(sc->name, "md%d", unit); 723 error = kthread_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 724 if (error) { 725 free(sc, M_MD); 726 return (NULL); 727 } 728 LIST_INSERT_HEAD(&md_softc_list, sc, list); 729 /* XXX: UNLOCK(unique unit numbers) */ 730 return (sc); 731 } 732 733 static void 734 mdinit(struct md_s *sc) 735 { 736 737 struct g_geom *gp; 738 struct g_provider *pp; 739 740 DROP_GIANT(); 741 g_topology_lock(); 742 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 743 gp->softc = sc; 744 pp = g_new_providerf(gp, "md%d", sc->unit); 745 pp->mediasize = sc->mediasize; 746 pp->sectorsize = sc->sectorsize; 747 sc->gp = gp; 748 sc->pp = pp; 749 g_error_provider(pp, 0); 750 g_topology_unlock(); 751 if (sc->type != MD_PRELOAD) 752 g_waitidle(); 753 PICKUP_GIANT(); 754 } 755 756 /* 757 * XXX: we should check that the range they feed us is mapped. 758 * XXX: we should implement read-only. 759 */ 760 761 static int 762 mdcreate_preload(struct md_s *sc, struct md_ioctl *mdio) 763 { 764 765 if (mdio->md_options & ~(MD_AUTOUNIT | MD_FORCE)) 766 return (EINVAL); 767 sc->flags = mdio->md_options & MD_FORCE; 768 /* Cast to pointer size, then to pointer to avoid warning */ 769 sc->pl_ptr = (u_char *)(uintptr_t)mdio->md_base; 770 sc->pl_len = (size_t)sc->mediasize; 771 return (0); 772 } 773 774 775 static int 776 mdcreate_malloc(struct md_s *sc, struct md_ioctl *mdio) 777 { 778 uintptr_t sp; 779 int error; 780 off_t u; 781 782 error = 0; 783 if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 784 return (EINVAL); 785 if (mdio->md_sectorsize != 0 && !powerof2(mdio->md_sectorsize)) 786 return (EINVAL); 787 /* Compression doesn't make sense if we have reserved space */ 788 if (mdio->md_options & MD_RESERVE) 789 mdio->md_options &= ~MD_COMPRESS; 790 if (mdio->md_fwsectors != 0) 791 sc->fwsectors = mdio->md_fwsectors; 792 if (mdio->md_fwheads != 0) 793 sc->fwheads = mdio->md_fwheads; 794 sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE); 795 sc->indir = dimension(sc->mediasize / sc->sectorsize); 796 sc->uma = uma_zcreate(sc->name, sc->sectorsize, NULL, NULL, NULL, NULL, 797 0x1ff, 0); 798 if (mdio->md_options & MD_RESERVE) { 799 off_t nsectors; 800 801 nsectors = sc->mediasize / sc->sectorsize; 802 for (u = 0; u < nsectors; u++) { 803 sp = (uintptr_t)uma_zalloc(sc->uma, M_NOWAIT | M_ZERO); 804 if (sp != 0) 805 error = s_write(sc->indir, u, sp); 806 else 807 error = ENOMEM; 808 if (error != 0) 809 break; 810 } 811 } 812 if (error != 0) 813 uma_zdestroy(sc->uma); 814 return (error); 815 } 816 817 818 static int 819 mdsetcred(struct md_s *sc, struct ucred *cred) 820 { 821 char *tmpbuf; 822 int error = 0; 823 824 /* 825 * Set credits in our softc 826 */ 827 828 if (sc->cred) 829 crfree(sc->cred); 830 sc->cred = crhold(cred); 831 832 /* 833 * Horrible kludge to establish credentials for NFS XXX. 834 */ 835 836 if (sc->vnode) { 837 struct uio auio; 838 struct iovec aiov; 839 840 tmpbuf = malloc(sc->sectorsize, M_TEMP, M_WAITOK); 841 bzero(&auio, sizeof(auio)); 842 843 aiov.iov_base = tmpbuf; 844 aiov.iov_len = sc->sectorsize; 845 auio.uio_iov = &aiov; 846 auio.uio_iovcnt = 1; 847 auio.uio_offset = 0; 848 auio.uio_rw = UIO_READ; 849 auio.uio_segflg = UIO_SYSSPACE; 850 auio.uio_resid = aiov.iov_len; 851 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 852 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 853 VOP_UNLOCK(sc->vnode, 0, curthread); 854 free(tmpbuf, M_TEMP); 855 } 856 return (error); 857 } 858 859 static int 860 mdcreate_vnode(struct md_s *sc, struct md_ioctl *mdio, struct thread *td) 861 { 862 struct vattr vattr; 863 struct nameidata nd; 864 int error, flags; 865 866 flags = FREAD|FWRITE; 867 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 868 error = vn_open(&nd, &flags, 0, -1); 869 if (error) { 870 NDFREE(&nd, NDF_ONLY_PNBUF); 871 if (error != EACCES && error != EPERM && error != EROFS) 872 return (error); 873 flags &= ~FWRITE; 874 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 875 error = vn_open(&nd, &flags, 0, -1); 876 } 877 NDFREE(&nd, NDF_ONLY_PNBUF); 878 if (error) 879 return (error); 880 if (nd.ni_vp->v_type != VREG || 881 (error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred, td))) { 882 VOP_UNLOCK(nd.ni_vp, 0, td); 883 (void)vn_close(nd.ni_vp, flags, td->td_ucred, td); 884 return (error ? error : EINVAL); 885 } 886 VOP_UNLOCK(nd.ni_vp, 0, td); 887 888 if (mdio->md_fwsectors != 0) 889 sc->fwsectors = mdio->md_fwsectors; 890 if (mdio->md_fwheads != 0) 891 sc->fwheads = mdio->md_fwheads; 892 sc->flags = mdio->md_options & (MD_FORCE | MD_ASYNC); 893 if (!(flags & FWRITE)) 894 sc->flags |= MD_READONLY; 895 sc->vnode = nd.ni_vp; 896 897 error = mdsetcred(sc, td->td_ucred); 898 if (error != 0) { 899 (void)vn_close(nd.ni_vp, flags, td->td_ucred, td); 900 return (error); 901 } 902 return (0); 903 } 904 905 static void 906 md_zapit(void *p, int cancel) 907 { 908 if (cancel) 909 return; 910 g_wither_geom(p, ENXIO); 911 } 912 913 static int 914 mddestroy(struct md_s *sc, struct thread *td) 915 { 916 917 GIANT_REQUIRED; 918 919 mtx_destroy(&sc->queue_mtx); 920 if (sc->gp) { 921 sc->gp->softc = NULL; 922 g_waitfor_event(md_zapit, sc->gp, M_WAITOK, sc->gp, NULL); 923 sc->gp = NULL; 924 sc->pp = NULL; 925 } 926 sc->flags |= MD_SHUTDOWN; 927 wakeup(sc); 928 while (sc->procp != NULL) 929 tsleep(&sc->procp, PRIBIO, "mddestroy", hz / 10); 930 if (sc->vnode != NULL) 931 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 932 FREAD : (FREAD|FWRITE), sc->cred, td); 933 if (sc->cred != NULL) 934 crfree(sc->cred); 935 if (sc->object != NULL) { 936 vm_object_deallocate(sc->object); 937 } 938 if (sc->indir) 939 destroy_indir(sc, sc->indir); 940 if (sc->uma) 941 uma_zdestroy(sc->uma); 942 943 /* XXX: LOCK(unique unit numbers) */ 944 LIST_REMOVE(sc, list); 945 /* XXX: UNLOCK(unique unit numbers) */ 946 free(sc, M_MD); 947 return (0); 948 } 949 950 static int 951 mdcreate_swap(struct md_s *sc, struct md_ioctl *mdio, struct thread *td) 952 { 953 vm_ooffset_t npage; 954 int error; 955 956 GIANT_REQUIRED; 957 958 /* 959 * Range check. Disallow negative sizes or any size less then the 960 * size of a page. Then round to a page. 961 */ 962 if (sc->mediasize == 0 || (sc->mediasize % PAGE_SIZE) != 0) 963 return (EDOM); 964 965 /* 966 * Allocate an OBJT_SWAP object. 967 * 968 * Note the truncation. 969 */ 970 971 npage = mdio->md_mediasize / PAGE_SIZE; 972 if (mdio->md_fwsectors != 0) 973 sc->fwsectors = mdio->md_fwsectors; 974 if (mdio->md_fwheads != 0) 975 sc->fwheads = mdio->md_fwheads; 976 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * npage, 977 VM_PROT_DEFAULT, 0); 978 if (sc->object == NULL) 979 return (ENOMEM); 980 sc->flags = mdio->md_options & MD_FORCE; 981 if (mdio->md_options & MD_RESERVE) { 982 if (swap_pager_reserve(sc->object, 0, npage) < 0) { 983 vm_object_deallocate(sc->object); 984 sc->object = NULL; 985 return (EDOM); 986 } 987 } 988 error = mdsetcred(sc, td->td_ucred); 989 if (error) { 990 vm_object_deallocate(sc->object); 991 sc->object = NULL; 992 } 993 return (error); 994 } 995 996 static int 997 mddetach(int unit, struct thread *td) 998 { 999 struct md_s *sc; 1000 1001 sc = mdfind(unit); 1002 if (sc == NULL) 1003 return (ENOENT); 1004 if (sc->opencount != 0 && !(sc->flags & MD_FORCE)) 1005 return (EBUSY); 1006 switch(sc->type) { 1007 case MD_VNODE: 1008 case MD_SWAP: 1009 case MD_MALLOC: 1010 case MD_PRELOAD: 1011 return (mddestroy(sc, td)); 1012 default: 1013 return (EOPNOTSUPP); 1014 } 1015 } 1016 1017 static int 1018 mdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 1019 { 1020 struct md_ioctl *mdio; 1021 struct md_s *sc; 1022 int error, i; 1023 1024 if (md_debug) 1025 printf("mdctlioctl(%s %lx %p %x %p)\n", 1026 devtoname(dev), cmd, addr, flags, td); 1027 1028 /* 1029 * We assert the version number in the individual ioctl 1030 * handlers instead of out here because (a) it is possible we 1031 * may add another ioctl in the future which doesn't read an 1032 * mdio, and (b) the correct return value for an unknown ioctl 1033 * is ENOIOCTL, not EINVAL. 1034 */ 1035 mdio = (struct md_ioctl *)addr; 1036 switch (cmd) { 1037 case MDIOCATTACH: 1038 if (mdio->md_version != MDIOVERSION) 1039 return (EINVAL); 1040 switch (mdio->md_type) { 1041 case MD_MALLOC: 1042 case MD_PRELOAD: 1043 case MD_VNODE: 1044 case MD_SWAP: 1045 break; 1046 default: 1047 return (EINVAL); 1048 } 1049 if (mdio->md_options & MD_AUTOUNIT) { 1050 sc = mdnew(-1); 1051 mdio->md_unit = sc->unit; 1052 } else { 1053 sc = mdnew(mdio->md_unit); 1054 if (sc == NULL) 1055 return (EBUSY); 1056 } 1057 sc->type = mdio->md_type; 1058 sc->mediasize = mdio->md_mediasize; 1059 if (mdio->md_sectorsize == 0) 1060 sc->sectorsize = DEV_BSIZE; 1061 else 1062 sc->sectorsize = mdio->md_sectorsize; 1063 error = EDOOFUS; 1064 switch (sc->type) { 1065 case MD_MALLOC: 1066 error = mdcreate_malloc(sc, mdio); 1067 break; 1068 case MD_PRELOAD: 1069 error = mdcreate_preload(sc, mdio); 1070 break; 1071 case MD_VNODE: 1072 error = mdcreate_vnode(sc, mdio, td); 1073 break; 1074 case MD_SWAP: 1075 error = mdcreate_swap(sc, mdio, td); 1076 break; 1077 } 1078 if (error != 0) { 1079 mddestroy(sc, td); 1080 return (error); 1081 } 1082 mdinit(sc); 1083 return (0); 1084 case MDIOCDETACH: 1085 if (mdio->md_version != MDIOVERSION) 1086 return (EINVAL); 1087 if (mdio->md_file != NULL || mdio->md_mediasize != 0 || 1088 mdio->md_options != 0) 1089 return (EINVAL); 1090 return (mddetach(mdio->md_unit, td)); 1091 case MDIOCQUERY: 1092 if (mdio->md_version != MDIOVERSION) 1093 return (EINVAL); 1094 sc = mdfind(mdio->md_unit); 1095 if (sc == NULL) 1096 return (ENOENT); 1097 mdio->md_type = sc->type; 1098 mdio->md_options = sc->flags; 1099 mdio->md_mediasize = sc->mediasize; 1100 mdio->md_sectorsize = sc->sectorsize; 1101 if (sc->type == MD_VNODE) { 1102 /* XXX fill this in */ 1103 mdio->md_file = NULL; 1104 } 1105 return (0); 1106 case MDIOCLIST: 1107 i = 1; 1108 LIST_FOREACH(sc, &md_softc_list, list) { 1109 if (i == MDNPAD - 1) 1110 mdio->md_pad[i] = -1; 1111 else 1112 mdio->md_pad[i++] = sc->unit; 1113 } 1114 mdio->md_pad[0] = i - 1; 1115 return (0); 1116 default: 1117 return (ENOIOCTL); 1118 }; 1119 return (ENOIOCTL); 1120 } 1121 1122 static void 1123 md_preloaded(u_char *image, size_t length) 1124 { 1125 struct md_s *sc; 1126 1127 sc = mdnew(-1); 1128 if (sc == NULL) 1129 return; 1130 sc->type = MD_PRELOAD; 1131 sc->mediasize = length; 1132 sc->sectorsize = DEV_BSIZE; 1133 sc->pl_ptr = image; 1134 sc->pl_len = length; 1135 #ifdef MD_ROOT 1136 if (sc->unit == 0) 1137 rootdevnames[0] = "ufs:/dev/md0"; 1138 #endif 1139 mdinit(sc); 1140 } 1141 1142 static void 1143 g_md_init(struct g_class *mp __unused) 1144 { 1145 1146 caddr_t mod; 1147 caddr_t c; 1148 u_char *ptr, *name, *type; 1149 unsigned len; 1150 1151 mod = NULL; 1152 g_topology_unlock(); 1153 #ifdef MD_ROOT_SIZE 1154 md_preloaded(mfs_root, MD_ROOT_SIZE*1024); 1155 #endif 1156 while ((mod = preload_search_next_name(mod)) != NULL) { 1157 name = (char *)preload_search_info(mod, MODINFO_NAME); 1158 type = (char *)preload_search_info(mod, MODINFO_TYPE); 1159 if (name == NULL) 1160 continue; 1161 if (type == NULL) 1162 continue; 1163 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 1164 continue; 1165 c = preload_search_info(mod, MODINFO_ADDR); 1166 ptr = *(u_char **)c; 1167 c = preload_search_info(mod, MODINFO_SIZE); 1168 len = *(size_t *)c; 1169 printf("%s%d: Preloaded image <%s> %d bytes at %p\n", 1170 MD_NAME, mdunits, name, len, ptr); 1171 md_preloaded(ptr, len); 1172 } 1173 status_dev = make_dev(&mdctl_cdevsw, 0xffff00ff, UID_ROOT, GID_WHEEL, 1174 0600, MDCTL_NAME); 1175 g_topology_lock(); 1176 } 1177 1178 static void 1179 g_md_fini(struct g_class *mp __unused) 1180 { 1181 1182 if (status_dev != NULL) 1183 destroy_dev(status_dev); 1184 } 1185