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 md_drvinit; 108 109 static int mdunits; 110 static struct cdev *status_dev = 0; 111 112 static d_ioctl_t mdctlioctl; 113 114 static struct cdevsw mdctl_cdevsw = { 115 .d_version = D_VERSION, 116 .d_flags = D_NEEDGIANT, 117 .d_ioctl = mdctlioctl, 118 .d_name = MD_NAME, 119 }; 120 121 122 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(&md_softc_list); 123 124 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 125 #define NMASK (NINDIR-1) 126 static int nshift; 127 128 struct indir { 129 uintptr_t *array; 130 u_int total; 131 u_int used; 132 u_int shift; 133 }; 134 135 struct md_s { 136 int unit; 137 LIST_ENTRY(md_s) list; 138 struct bio_queue_head bio_queue; 139 struct mtx queue_mtx; 140 struct cdev *dev; 141 enum md_types type; 142 unsigned nsect; 143 unsigned opencount; 144 unsigned secsize; 145 unsigned fwheads; 146 unsigned fwsectors; 147 unsigned flags; 148 char name[20]; 149 struct proc *procp; 150 struct g_geom *gp; 151 struct g_provider *pp; 152 153 /* MD_MALLOC related fields */ 154 struct indir *indir; 155 uma_zone_t uma; 156 157 /* MD_PRELOAD related fields */ 158 u_char *pl_ptr; 159 unsigned pl_len; 160 161 /* MD_VNODE related fields */ 162 struct vnode *vnode; 163 struct ucred *cred; 164 165 /* MD_SWAP related fields */ 166 vm_object_t object; 167 unsigned npage; 168 }; 169 170 static int mddestroy(struct md_s *sc, struct thread *td); 171 172 static struct indir * 173 new_indir(u_int shift) 174 { 175 struct indir *ip; 176 177 ip = malloc(sizeof *ip, M_MD, M_NOWAIT | M_ZERO); 178 if (ip == NULL) 179 return (NULL); 180 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 181 M_MDSECT, M_NOWAIT | M_ZERO); 182 if (ip->array == NULL) { 183 free(ip, M_MD); 184 return (NULL); 185 } 186 ip->total = NINDIR; 187 ip->shift = shift; 188 return (ip); 189 } 190 191 static void 192 del_indir(struct indir *ip) 193 { 194 195 free(ip->array, M_MDSECT); 196 free(ip, M_MD); 197 } 198 199 static void 200 destroy_indir(struct md_s *sc, struct indir *ip) 201 { 202 int i; 203 204 for (i = 0; i < NINDIR; i++) { 205 if (!ip->array[i]) 206 continue; 207 if (ip->shift) 208 destroy_indir(sc, (struct indir*)(ip->array[i])); 209 else if (ip->array[i] > 255) 210 uma_zfree(sc->uma, (void *)(ip->array[i])); 211 } 212 del_indir(ip); 213 } 214 215 /* 216 * This function does the math and alloctes the top level "indir" structure 217 * for a device of "size" sectors. 218 */ 219 220 static struct indir * 221 dimension(off_t size) 222 { 223 off_t rcnt; 224 struct indir *ip; 225 int i, layer; 226 227 rcnt = size; 228 layer = 0; 229 while (rcnt > NINDIR) { 230 rcnt /= NINDIR; 231 layer++; 232 } 233 /* figure out log2(NINDIR) */ 234 for (i = NINDIR, nshift = -1; i; nshift++) 235 i >>= 1; 236 237 /* 238 * XXX: the top layer is probably not fully populated, so we allocate 239 * too much space for ip->array in here. 240 */ 241 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO); 242 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 243 M_MDSECT, M_WAITOK | M_ZERO); 244 ip->total = NINDIR; 245 ip->shift = layer * nshift; 246 return (ip); 247 } 248 249 /* 250 * Read a given sector 251 */ 252 253 static uintptr_t 254 s_read(struct indir *ip, off_t offset) 255 { 256 struct indir *cip; 257 int idx; 258 uintptr_t up; 259 260 if (md_debug > 1) 261 printf("s_read(%jd)\n", (intmax_t)offset); 262 up = 0; 263 for (cip = ip; cip != NULL;) { 264 if (cip->shift) { 265 idx = (offset >> cip->shift) & NMASK; 266 up = cip->array[idx]; 267 cip = (struct indir *)up; 268 continue; 269 } 270 idx = offset & NMASK; 271 return (cip->array[idx]); 272 } 273 return (0); 274 } 275 276 /* 277 * Write a given sector, prune the tree if the value is 0 278 */ 279 280 static int 281 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 282 { 283 struct indir *cip, *lip[10]; 284 int idx, li; 285 uintptr_t up; 286 287 if (md_debug > 1) 288 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 289 up = 0; 290 li = 0; 291 cip = ip; 292 for (;;) { 293 lip[li++] = cip; 294 if (cip->shift) { 295 idx = (offset >> cip->shift) & NMASK; 296 up = cip->array[idx]; 297 if (up != 0) { 298 cip = (struct indir *)up; 299 continue; 300 } 301 /* Allocate branch */ 302 cip->array[idx] = 303 (uintptr_t)new_indir(cip->shift - nshift); 304 if (cip->array[idx] == 0) 305 return (ENOSPC); 306 cip->used++; 307 up = cip->array[idx]; 308 cip = (struct indir *)up; 309 continue; 310 } 311 /* leafnode */ 312 idx = offset & NMASK; 313 up = cip->array[idx]; 314 if (up != 0) 315 cip->used--; 316 cip->array[idx] = ptr; 317 if (ptr != 0) 318 cip->used++; 319 break; 320 } 321 if (cip->used != 0 || li == 1) 322 return (0); 323 li--; 324 while (cip->used == 0 && cip != ip) { 325 li--; 326 idx = (offset >> lip[li]->shift) & NMASK; 327 up = lip[li]->array[idx]; 328 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 329 del_indir(cip); 330 lip[li]->array[idx] = 0; 331 lip[li]->used--; 332 cip = lip[li]; 333 } 334 return (0); 335 } 336 337 338 struct g_class g_md_class = { 339 .name = "MD", 340 .init = md_drvinit, 341 }; 342 343 static int 344 g_md_access(struct g_provider *pp, int r, int w, int e) 345 { 346 struct md_s *sc; 347 348 sc = pp->geom->softc; 349 if (sc == NULL) 350 return (ENXIO); 351 r += pp->acr; 352 w += pp->acw; 353 e += pp->ace; 354 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 355 sc->opencount = 1; 356 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 357 sc->opencount = 0; 358 } 359 return (0); 360 } 361 362 static void 363 g_md_start(struct bio *bp) 364 { 365 struct md_s *sc; 366 367 sc = bp->bio_to->geom->softc; 368 369 bp->bio_pblkno = bp->bio_offset / sc->secsize; 370 bp->bio_bcount = bp->bio_length; 371 mtx_lock(&sc->queue_mtx); 372 bioq_disksort(&sc->bio_queue, bp); 373 mtx_unlock(&sc->queue_mtx); 374 375 wakeup(sc); 376 } 377 378 DECLARE_GEOM_CLASS(g_md_class, g_md); 379 380 381 static int 382 mdstart_malloc(struct md_s *sc, struct bio *bp) 383 { 384 int i, error; 385 u_char *dst; 386 unsigned secno, nsec, uc; 387 uintptr_t sp, osp; 388 389 nsec = bp->bio_bcount / sc->secsize; 390 secno = bp->bio_pblkno; 391 dst = bp->bio_data; 392 error = 0; 393 while (nsec--) { 394 osp = s_read(sc->indir, secno); 395 if (bp->bio_cmd == BIO_DELETE) { 396 if (osp != 0) 397 error = s_write(sc->indir, secno, 0); 398 } else if (bp->bio_cmd == BIO_READ) { 399 if (osp == 0) 400 bzero(dst, sc->secsize); 401 else if (osp <= 255) 402 for (i = 0; i < sc->secsize; i++) 403 dst[i] = osp; 404 else 405 bcopy((void *)osp, dst, sc->secsize); 406 osp = 0; 407 } else if (bp->bio_cmd == BIO_WRITE) { 408 if (sc->flags & MD_COMPRESS) { 409 uc = dst[0]; 410 for (i = 1; i < sc->secsize; i++) 411 if (dst[i] != uc) 412 break; 413 } else { 414 i = 0; 415 uc = 0; 416 } 417 if (i == sc->secsize) { 418 if (osp != uc) 419 error = s_write(sc->indir, secno, uc); 420 } else { 421 if (osp <= 255) { 422 sp = (uintptr_t) uma_zalloc( 423 sc->uma, M_NOWAIT); 424 if (sp == 0) { 425 error = ENOSPC; 426 break; 427 } 428 bcopy(dst, (void *)sp, sc->secsize); 429 error = s_write(sc->indir, secno, sp); 430 } else { 431 bcopy(dst, (void *)osp, sc->secsize); 432 osp = 0; 433 } 434 } 435 } else { 436 error = EOPNOTSUPP; 437 } 438 if (osp > 255) 439 uma_zfree(sc->uma, (void*)osp); 440 if (error) 441 break; 442 secno++; 443 dst += sc->secsize; 444 } 445 bp->bio_resid = 0; 446 return (error); 447 } 448 449 static int 450 mdstart_preload(struct md_s *sc, struct bio *bp) 451 { 452 453 if (bp->bio_cmd == BIO_DELETE) { 454 } else if (bp->bio_cmd == BIO_READ) { 455 bcopy(sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_data, bp->bio_bcount); 456 } else { 457 bcopy(bp->bio_data, sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_bcount); 458 } 459 bp->bio_resid = 0; 460 return (0); 461 } 462 463 static int 464 mdstart_vnode(struct md_s *sc, struct bio *bp) 465 { 466 int error; 467 struct uio auio; 468 struct iovec aiov; 469 struct mount *mp; 470 471 /* 472 * VNODE I/O 473 * 474 * If an error occurs, we set BIO_ERROR but we do not set 475 * B_INVAL because (for a write anyway), the buffer is 476 * still valid. 477 */ 478 479 bzero(&auio, sizeof(auio)); 480 481 aiov.iov_base = bp->bio_data; 482 aiov.iov_len = bp->bio_bcount; 483 auio.uio_iov = &aiov; 484 auio.uio_iovcnt = 1; 485 auio.uio_offset = (vm_ooffset_t)bp->bio_pblkno * sc->secsize; 486 auio.uio_segflg = UIO_SYSSPACE; 487 if(bp->bio_cmd == BIO_READ) 488 auio.uio_rw = UIO_READ; 489 else if(bp->bio_cmd == BIO_WRITE) 490 auio.uio_rw = UIO_WRITE; 491 else 492 panic("wrong BIO_OP in mdstart_vnode"); 493 auio.uio_resid = bp->bio_bcount; 494 auio.uio_td = curthread; 495 /* 496 * When reading set IO_DIRECT to try to avoid double-caching 497 * the data. When writing IO_DIRECT is not optimal. 498 */ 499 if (bp->bio_cmd == BIO_READ) { 500 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 501 error = VOP_READ(sc->vnode, &auio, IO_DIRECT, sc->cred); 502 VOP_UNLOCK(sc->vnode, 0, curthread); 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, 507 sc->flags & MD_ASYNC ? 0 : IO_SYNC, sc->cred); 508 VOP_UNLOCK(sc->vnode, 0, curthread); 509 vn_finished_write(mp); 510 } 511 bp->bio_resid = auio.uio_resid; 512 return (error); 513 } 514 515 static int 516 mdstart_swap(struct md_s *sc, struct bio *bp) 517 { 518 struct sf_buf *sf; 519 int i, rv; 520 int offs, len, lastp, lastend; 521 vm_page_t m; 522 u_char *p; 523 524 p = bp->bio_data; 525 526 /* 527 * offs is the ofset at whih to start operating on the 528 * next (ie, first) page. lastp is the last page on 529 * which we're going to operate. lastend is the ending 530 * position within that last page (ie, PAGE_SIZE if 531 * we're operating on complete aligned pages). 532 */ 533 offs = bp->bio_offset % PAGE_SIZE; 534 lastp = (bp->bio_offset + bp->bio_length - 1) / PAGE_SIZE; 535 lastend = (bp->bio_offset + bp->bio_length - 1) % PAGE_SIZE + 1; 536 537 VM_OBJECT_LOCK(sc->object); 538 vm_object_pip_add(sc->object, 1); 539 for (i = bp->bio_offset / PAGE_SIZE; i <= lastp; i++) { 540 len = ((i == lastp) ? lastend : PAGE_SIZE) - offs; 541 542 m = vm_page_grab(sc->object, i, 543 VM_ALLOC_NORMAL|VM_ALLOC_RETRY); 544 VM_OBJECT_UNLOCK(sc->object); 545 sf = sf_buf_alloc(m, 0); 546 VM_OBJECT_LOCK(sc->object); 547 if (bp->bio_cmd == BIO_READ) { 548 if (m->valid != VM_PAGE_BITS_ALL) 549 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 550 bcopy((void *)(sf_buf_kva(sf) + offs), p, len); 551 } else if (bp->bio_cmd == BIO_WRITE) { 552 if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL) 553 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 554 bcopy(p, (void *)(sf_buf_kva(sf) + offs), len); 555 m->valid = VM_PAGE_BITS_ALL; 556 #if 0 557 } else if (bp->bio_cmd == BIO_DELETE) { 558 if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL) 559 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 560 bzero((void *)(sf_buf_kva(sf) + offs), len); 561 vm_page_dirty(m); 562 m->valid = VM_PAGE_BITS_ALL; 563 #endif 564 } 565 sf_buf_free(sf); 566 vm_page_lock_queues(); 567 vm_page_wakeup(m); 568 vm_page_activate(m); 569 if (bp->bio_cmd == BIO_WRITE) 570 vm_page_dirty(m); 571 vm_page_unlock_queues(); 572 573 /* Actions on further pages start at offset 0 */ 574 p += PAGE_SIZE - offs; 575 offs = 0; 576 #if 0 577 if (bootverbose || bp->bio_offset / PAGE_SIZE < 17) 578 printf("wire_count %d busy %d flags %x hold_count %d act_count %d queue %d valid %d dirty %d @ %d\n", 579 m->wire_count, m->busy, 580 m->flags, m->hold_count, m->act_count, m->queue, m->valid, m->dirty, i); 581 #endif 582 } 583 vm_object_pip_subtract(sc->object, 1); 584 vm_object_set_writeable_dirty(sc->object); 585 VM_OBJECT_UNLOCK(sc->object); 586 return (0); 587 } 588 589 static void 590 md_kthread(void *arg) 591 { 592 struct md_s *sc; 593 struct bio *bp; 594 int error, hasgiant; 595 596 sc = arg; 597 curthread->td_base_pri = PRIBIO; 598 599 switch (sc->type) { 600 case MD_VNODE: 601 mtx_lock(&Giant); 602 hasgiant = 1; 603 break; 604 case MD_MALLOC: 605 case MD_PRELOAD: 606 case MD_SWAP: 607 default: 608 hasgiant = 0; 609 break; 610 } 611 612 for (;;) { 613 mtx_lock(&sc->queue_mtx); 614 bp = bioq_first(&sc->bio_queue); 615 if (bp) 616 bioq_remove(&sc->bio_queue, bp); 617 if (!bp) { 618 if (sc->flags & MD_SHUTDOWN) { 619 mtx_unlock(&sc->queue_mtx); 620 sc->procp = NULL; 621 wakeup(&sc->procp); 622 if (hasgiant) 623 mtx_unlock(&Giant); 624 kthread_exit(0); 625 } 626 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 627 continue; 628 } 629 mtx_unlock(&sc->queue_mtx); 630 if (bp->bio_cmd == BIO_GETATTR) { 631 if (sc->fwsectors && sc->fwheads && 632 (g_handleattr_int(bp, "GEOM::fwsectors", 633 sc->fwsectors) || 634 g_handleattr_int(bp, "GEOM::fwheads", 635 sc->fwheads))) 636 error = -1; 637 else 638 error = EOPNOTSUPP; 639 } else { 640 switch (sc->type) { 641 case MD_MALLOC: 642 error = mdstart_malloc(sc, bp); 643 break; 644 case MD_PRELOAD: 645 error = mdstart_preload(sc, bp); 646 break; 647 case MD_VNODE: 648 error = mdstart_vnode(sc, bp); 649 break; 650 case MD_SWAP: 651 error = mdstart_swap(sc, bp); 652 break; 653 default: 654 panic("Impossible md(type)"); 655 break; 656 } 657 } 658 659 if (error != -1) { 660 bp->bio_completed = bp->bio_length; 661 g_io_deliver(bp, error); 662 } 663 } 664 } 665 666 static struct md_s * 667 mdfind(int unit) 668 { 669 struct md_s *sc; 670 671 /* XXX: LOCK(unique unit numbers) */ 672 LIST_FOREACH(sc, &md_softc_list, list) { 673 if (sc->unit == unit) 674 break; 675 } 676 /* XXX: UNLOCK(unique unit numbers) */ 677 return (sc); 678 } 679 680 static struct md_s * 681 mdnew(int unit) 682 { 683 struct md_s *sc; 684 int error, max = -1; 685 686 /* XXX: LOCK(unique unit numbers) */ 687 LIST_FOREACH(sc, &md_softc_list, list) { 688 if (sc->unit == unit) { 689 /* XXX: UNLOCK(unique unit numbers) */ 690 return (NULL); 691 } 692 if (sc->unit > max) 693 max = sc->unit; 694 } 695 if (unit == -1) 696 unit = max + 1; 697 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 698 sc->unit = unit; 699 bioq_init(&sc->bio_queue); 700 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 701 sprintf(sc->name, "md%d", unit); 702 error = kthread_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 703 if (error) { 704 free(sc, M_MD); 705 return (NULL); 706 } 707 LIST_INSERT_HEAD(&md_softc_list, sc, list); 708 /* XXX: UNLOCK(unique unit numbers) */ 709 return (sc); 710 } 711 712 static void 713 mdinit(struct md_s *sc) 714 { 715 716 struct g_geom *gp; 717 struct g_provider *pp; 718 719 DROP_GIANT(); 720 g_topology_lock(); 721 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 722 gp->start = g_md_start; 723 gp->access = g_md_access; 724 gp->softc = sc; 725 pp = g_new_providerf(gp, "md%d", sc->unit); 726 pp->mediasize = (off_t)sc->nsect * sc->secsize; 727 pp->sectorsize = sc->secsize; 728 sc->gp = gp; 729 sc->pp = pp; 730 g_error_provider(pp, 0); 731 g_topology_unlock(); 732 PICKUP_GIANT(); 733 } 734 735 /* 736 * XXX: we should check that the range they feed us is mapped. 737 * XXX: we should implement read-only. 738 */ 739 740 static int 741 mdcreate_preload(struct md_ioctl *mdio) 742 { 743 struct md_s *sc; 744 745 if (mdio->md_size == 0) 746 return (EINVAL); 747 if (mdio->md_options & ~(MD_AUTOUNIT)) 748 return (EINVAL); 749 if (mdio->md_options & MD_AUTOUNIT) { 750 sc = mdnew(-1); 751 if (sc == NULL) 752 return (ENOMEM); 753 mdio->md_unit = sc->unit; 754 } else { 755 sc = mdnew(mdio->md_unit); 756 if (sc == NULL) 757 return (EBUSY); 758 } 759 sc->type = MD_PRELOAD; 760 sc->secsize = DEV_BSIZE; 761 sc->nsect = mdio->md_size; 762 sc->flags = mdio->md_options & MD_FORCE; 763 /* Cast to pointer size, then to pointer to avoid warning */ 764 sc->pl_ptr = (u_char *)(uintptr_t)mdio->md_base; 765 sc->pl_len = (mdio->md_size << DEV_BSHIFT); 766 mdinit(sc); 767 return (0); 768 } 769 770 771 static int 772 mdcreate_malloc(struct md_ioctl *mdio) 773 { 774 struct md_s *sc; 775 off_t u; 776 uintptr_t sp; 777 int error; 778 779 error = 0; 780 if (mdio->md_size == 0) 781 return (EINVAL); 782 if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 783 return (EINVAL); 784 if (mdio->md_secsize != 0 && !powerof2(mdio->md_secsize)) 785 return (EINVAL); 786 /* Compression doesn't make sense if we have reserved space */ 787 if (mdio->md_options & MD_RESERVE) 788 mdio->md_options &= ~MD_COMPRESS; 789 if (mdio->md_options & MD_AUTOUNIT) { 790 sc = mdnew(-1); 791 if (sc == NULL) 792 return (ENOMEM); 793 mdio->md_unit = sc->unit; 794 } else { 795 sc = mdnew(mdio->md_unit); 796 if (sc == NULL) 797 return (EBUSY); 798 } 799 sc->type = MD_MALLOC; 800 if (mdio->md_secsize != 0) 801 sc->secsize = mdio->md_secsize; 802 else 803 sc->secsize = DEV_BSIZE; 804 if (mdio->md_fwsectors != 0) 805 sc->fwsectors = mdio->md_fwsectors; 806 if (mdio->md_fwheads != 0) 807 sc->fwheads = mdio->md_fwheads; 808 sc->nsect = (mdio->md_size * DEV_BSIZE) / sc->secsize; 809 sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE); 810 sc->indir = dimension(sc->nsect); 811 sc->uma = uma_zcreate(sc->name, sc->secsize, 812 NULL, NULL, NULL, NULL, 0x1ff, 0); 813 if (mdio->md_options & MD_RESERVE) { 814 for (u = 0; u < sc->nsect; u++) { 815 sp = (uintptr_t) uma_zalloc(sc->uma, M_NOWAIT | M_ZERO); 816 if (sp != 0) 817 error = s_write(sc->indir, u, sp); 818 else 819 error = ENOMEM; 820 if (error) 821 break; 822 } 823 } 824 if (error) { 825 mddestroy(sc, NULL); 826 return (error); 827 } 828 mdinit(sc); 829 if (!(mdio->md_options & MD_RESERVE)) 830 sc->pp->flags |= G_PF_CANDELETE; 831 return (0); 832 } 833 834 835 static int 836 mdsetcred(struct md_s *sc, struct ucred *cred) 837 { 838 char *tmpbuf; 839 int error = 0; 840 841 /* 842 * Set credits in our softc 843 */ 844 845 if (sc->cred) 846 crfree(sc->cred); 847 sc->cred = crhold(cred); 848 849 /* 850 * Horrible kludge to establish credentials for NFS XXX. 851 */ 852 853 if (sc->vnode) { 854 struct uio auio; 855 struct iovec aiov; 856 857 tmpbuf = malloc(sc->secsize, M_TEMP, M_WAITOK); 858 bzero(&auio, sizeof(auio)); 859 860 aiov.iov_base = tmpbuf; 861 aiov.iov_len = sc->secsize; 862 auio.uio_iov = &aiov; 863 auio.uio_iovcnt = 1; 864 auio.uio_offset = 0; 865 auio.uio_rw = UIO_READ; 866 auio.uio_segflg = UIO_SYSSPACE; 867 auio.uio_resid = aiov.iov_len; 868 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 869 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 870 VOP_UNLOCK(sc->vnode, 0, curthread); 871 free(tmpbuf, M_TEMP); 872 } 873 return (error); 874 } 875 876 static int 877 mdcreate_vnode(struct md_ioctl *mdio, struct thread *td) 878 { 879 struct md_s *sc; 880 struct vattr vattr; 881 struct nameidata nd; 882 int error, flags; 883 884 flags = FREAD|FWRITE; 885 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 886 error = vn_open(&nd, &flags, 0, -1); 887 if (error) { 888 if (error != EACCES && error != EPERM && error != EROFS) 889 return (error); 890 flags &= ~FWRITE; 891 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 892 error = vn_open(&nd, &flags, 0, -1); 893 if (error) 894 return (error); 895 } 896 NDFREE(&nd, NDF_ONLY_PNBUF); 897 if (nd.ni_vp->v_type != VREG || 898 (error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred, td))) { 899 VOP_UNLOCK(nd.ni_vp, 0, td); 900 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 901 return (error ? error : EINVAL); 902 } 903 VOP_UNLOCK(nd.ni_vp, 0, td); 904 905 if (mdio->md_options & MD_AUTOUNIT) { 906 sc = mdnew(-1); 907 mdio->md_unit = sc->unit; 908 } else { 909 sc = mdnew(mdio->md_unit); 910 } 911 if (sc == NULL) { 912 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 913 return (EBUSY); 914 } 915 916 if (mdio->md_fwsectors != 0) 917 sc->fwsectors = mdio->md_fwsectors; 918 if (mdio->md_fwheads != 0) 919 sc->fwheads = mdio->md_fwheads; 920 sc->type = MD_VNODE; 921 sc->flags = mdio->md_options & (MD_FORCE | MD_ASYNC); 922 if (!(flags & FWRITE)) 923 sc->flags |= MD_READONLY; 924 sc->secsize = DEV_BSIZE; 925 sc->vnode = nd.ni_vp; 926 927 /* 928 * If the size is specified, override the file attributes. 929 */ 930 if (mdio->md_size) 931 sc->nsect = mdio->md_size; 932 else 933 sc->nsect = vattr.va_size / sc->secsize; /* XXX: round up ? */ 934 if (sc->nsect == 0) { 935 mddestroy(sc, td); 936 return (EINVAL); 937 } 938 error = mdsetcred(sc, td->td_ucred); 939 if (error) { 940 mddestroy(sc, td); 941 return (error); 942 } 943 mdinit(sc); 944 return (0); 945 } 946 947 static void 948 md_zapit(void *p, int cancel) 949 { 950 if (cancel) 951 return; 952 g_wither_geom(p, ENXIO); 953 } 954 955 static int 956 mddestroy(struct md_s *sc, struct thread *td) 957 { 958 959 GIANT_REQUIRED; 960 961 mtx_destroy(&sc->queue_mtx); 962 if (sc->gp) { 963 sc->gp->softc = NULL; 964 g_waitfor_event(md_zapit, sc->gp, M_WAITOK, sc->gp, NULL); 965 sc->gp = NULL; 966 sc->pp = NULL; 967 } 968 sc->flags |= MD_SHUTDOWN; 969 wakeup(sc); 970 while (sc->procp != NULL) 971 tsleep(&sc->procp, PRIBIO, "mddestroy", hz / 10); 972 if (sc->vnode != NULL) 973 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 974 FREAD : (FREAD|FWRITE), sc->cred, td); 975 if (sc->cred != NULL) 976 crfree(sc->cred); 977 if (sc->object != NULL) { 978 vm_object_deallocate(sc->object); 979 } 980 if (sc->indir) 981 destroy_indir(sc, sc->indir); 982 if (sc->uma) 983 uma_zdestroy(sc->uma); 984 985 /* XXX: LOCK(unique unit numbers) */ 986 LIST_REMOVE(sc, list); 987 /* XXX: UNLOCK(unique unit numbers) */ 988 free(sc, M_MD); 989 return (0); 990 } 991 992 static int 993 mdcreate_swap(struct md_ioctl *mdio, struct thread *td) 994 { 995 int error; 996 struct md_s *sc; 997 998 GIANT_REQUIRED; 999 1000 if (mdio->md_options & MD_AUTOUNIT) { 1001 sc = mdnew(-1); 1002 mdio->md_unit = sc->unit; 1003 } else { 1004 sc = mdnew(mdio->md_unit); 1005 } 1006 if (sc == NULL) 1007 return (EBUSY); 1008 1009 sc->type = MD_SWAP; 1010 1011 /* 1012 * Range check. Disallow negative sizes or any size less then the 1013 * size of a page. Then round to a page. 1014 */ 1015 1016 if (mdio->md_size == 0) { 1017 mddestroy(sc, td); 1018 return (EDOM); 1019 } 1020 1021 /* 1022 * Allocate an OBJT_SWAP object. 1023 * 1024 * sc_nsect is in units of DEV_BSIZE. 1025 * sc_npage is in units of PAGE_SIZE. 1026 * 1027 * Note the truncation. 1028 */ 1029 1030 sc->secsize = DEV_BSIZE; 1031 sc->npage = mdio->md_size / (PAGE_SIZE / DEV_BSIZE); 1032 sc->nsect = sc->npage * (PAGE_SIZE / DEV_BSIZE); 1033 if (mdio->md_fwsectors != 0) 1034 sc->fwsectors = mdio->md_fwsectors; 1035 if (mdio->md_fwheads != 0) 1036 sc->fwheads = mdio->md_fwheads; 1037 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * 1038 (vm_offset_t)sc->npage, VM_PROT_DEFAULT, 0); 1039 sc->flags = mdio->md_options & MD_FORCE; 1040 if (mdio->md_options & MD_RESERVE) { 1041 if (swap_pager_reserve(sc->object, 0, sc->npage) < 0) { 1042 vm_object_deallocate(sc->object); 1043 sc->object = NULL; 1044 mddestroy(sc, td); 1045 return (EDOM); 1046 } 1047 } 1048 error = mdsetcred(sc, td->td_ucred); 1049 if (error) { 1050 mddestroy(sc, td); 1051 return (error); 1052 } 1053 mdinit(sc); 1054 if (!(mdio->md_options & MD_RESERVE)) 1055 sc->pp->flags |= G_PF_CANDELETE; 1056 return (0); 1057 } 1058 1059 static int 1060 mddetach(int unit, struct thread *td) 1061 { 1062 struct md_s *sc; 1063 1064 sc = mdfind(unit); 1065 if (sc == NULL) 1066 return (ENOENT); 1067 if (sc->opencount != 0 && !(sc->flags & MD_FORCE)) 1068 return (EBUSY); 1069 switch(sc->type) { 1070 case MD_VNODE: 1071 case MD_SWAP: 1072 case MD_MALLOC: 1073 case MD_PRELOAD: 1074 return (mddestroy(sc, td)); 1075 default: 1076 return (EOPNOTSUPP); 1077 } 1078 } 1079 1080 static int 1081 mdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 1082 { 1083 struct md_ioctl *mdio; 1084 struct md_s *sc; 1085 int i; 1086 1087 if (md_debug) 1088 printf("mdctlioctl(%s %lx %p %x %p)\n", 1089 devtoname(dev), cmd, addr, flags, td); 1090 1091 /* 1092 * We assert the version number in the individual ioctl 1093 * handlers instead of out here because (a) it is possible we 1094 * may add another ioctl in the future which doesn't read an 1095 * mdio, and (b) the correct return value for an unknown ioctl 1096 * is ENOIOCTL, not EINVAL. 1097 */ 1098 mdio = (struct md_ioctl *)addr; 1099 switch (cmd) { 1100 case MDIOCATTACH: 1101 if (mdio->md_version != MDIOVERSION) 1102 return (EINVAL); 1103 switch (mdio->md_type) { 1104 case MD_MALLOC: 1105 return (mdcreate_malloc(mdio)); 1106 case MD_PRELOAD: 1107 return (mdcreate_preload(mdio)); 1108 case MD_VNODE: 1109 return (mdcreate_vnode(mdio, td)); 1110 case MD_SWAP: 1111 return (mdcreate_swap(mdio, td)); 1112 default: 1113 return (EINVAL); 1114 } 1115 case MDIOCDETACH: 1116 if (mdio->md_version != MDIOVERSION) 1117 return (EINVAL); 1118 if (mdio->md_file != NULL || mdio->md_size != 0 || 1119 mdio->md_options != 0) 1120 return (EINVAL); 1121 return (mddetach(mdio->md_unit, td)); 1122 case MDIOCQUERY: 1123 if (mdio->md_version != MDIOVERSION) 1124 return (EINVAL); 1125 sc = mdfind(mdio->md_unit); 1126 if (sc == NULL) 1127 return (ENOENT); 1128 mdio->md_type = sc->type; 1129 mdio->md_options = sc->flags; 1130 switch (sc->type) { 1131 case MD_MALLOC: 1132 mdio->md_size = sc->nsect; 1133 break; 1134 case MD_PRELOAD: 1135 mdio->md_size = sc->nsect; 1136 mdio->md_base = (uint64_t)(intptr_t)sc->pl_ptr; 1137 break; 1138 case MD_SWAP: 1139 mdio->md_size = sc->nsect; 1140 break; 1141 case MD_VNODE: 1142 mdio->md_size = sc->nsect; 1143 /* XXX fill this in */ 1144 mdio->md_file = NULL; 1145 break; 1146 } 1147 return (0); 1148 case MDIOCLIST: 1149 i = 1; 1150 LIST_FOREACH(sc, &md_softc_list, list) { 1151 if (i == MDNPAD - 1) 1152 mdio->md_pad[i] = -1; 1153 else 1154 mdio->md_pad[i++] = sc->unit; 1155 } 1156 mdio->md_pad[0] = i - 1; 1157 return (0); 1158 default: 1159 return (ENOIOCTL); 1160 }; 1161 return (ENOIOCTL); 1162 } 1163 1164 static void 1165 md_preloaded(u_char *image, unsigned length) 1166 { 1167 struct md_s *sc; 1168 1169 sc = mdnew(-1); 1170 if (sc == NULL) 1171 return; 1172 sc->type = MD_PRELOAD; 1173 sc->secsize = DEV_BSIZE; 1174 sc->nsect = length / DEV_BSIZE; 1175 sc->pl_ptr = image; 1176 sc->pl_len = length; 1177 #ifdef MD_ROOT 1178 if (sc->unit == 0) 1179 rootdevnames[0] = "ufs:/dev/md0"; 1180 #endif 1181 mdinit(sc); 1182 } 1183 1184 static void 1185 md_drvinit(struct g_class *mp __unused) 1186 { 1187 1188 caddr_t mod; 1189 caddr_t c; 1190 u_char *ptr, *name, *type; 1191 unsigned len; 1192 1193 mod = NULL; 1194 g_topology_unlock(); 1195 #ifdef MD_ROOT_SIZE 1196 md_preloaded(mfs_root, MD_ROOT_SIZE*1024); 1197 #endif 1198 while ((mod = preload_search_next_name(mod)) != NULL) { 1199 name = (char *)preload_search_info(mod, MODINFO_NAME); 1200 type = (char *)preload_search_info(mod, MODINFO_TYPE); 1201 if (name == NULL) 1202 continue; 1203 if (type == NULL) 1204 continue; 1205 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 1206 continue; 1207 c = preload_search_info(mod, MODINFO_ADDR); 1208 ptr = *(u_char **)c; 1209 c = preload_search_info(mod, MODINFO_SIZE); 1210 len = *(size_t *)c; 1211 printf("%s%d: Preloaded image <%s> %d bytes at %p\n", 1212 MD_NAME, mdunits, name, len, ptr); 1213 md_preloaded(ptr, len); 1214 } 1215 status_dev = make_dev(&mdctl_cdevsw, 0xffff00ff, UID_ROOT, GID_WHEEL, 1216 0600, MDCTL_NAME); 1217 g_topology_lock(); 1218 } 1219 1220 static int 1221 md_modevent(module_t mod, int type, void *data) 1222 { 1223 int error; 1224 struct md_s *sc; 1225 1226 switch (type) { 1227 case MOD_LOAD: 1228 break; 1229 case MOD_UNLOAD: 1230 LIST_FOREACH(sc, &md_softc_list, list) { 1231 error = mddetach(sc->unit, curthread); 1232 if (error != 0) 1233 return (error); 1234 } 1235 if (status_dev) 1236 destroy_dev(status_dev); 1237 status_dev = 0; 1238 break; 1239 default: 1240 return (EOPNOTSUPP); 1241 break; 1242 } 1243 return (0); 1244 } 1245 1246 static moduledata_t md_mod = { 1247 MD_NAME, 1248 md_modevent, 1249 NULL 1250 }; 1251 DECLARE_MODULE(md, md_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE); 1252 MODULE_VERSION(md, MD_MODVER); 1253