md.c revision 127691
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: head/sys/dev/md/md.c 127691 2004-03-31 21:48:02Z luigi $ 10 * 11 */ 12 13/* 14 * The following functions are based in the vn(4) driver: mdstart_swap(), 15 * mdstart_vnode(), mdcreate_swap(), mdcreate_vnode() and mddestroy(), 16 * and as such under the following copyright: 17 * 18 * Copyright (c) 1988 University of Utah. 19 * Copyright (c) 1990, 1993 20 * The Regents of the University of California. All rights reserved. 21 * 22 * This code is derived from software contributed to Berkeley by 23 * the Systems Programming Group of the University of Utah Computer 24 * Science Department. 25 * 26 * Redistribution and use in source and binary forms, with or without 27 * modification, are permitted provided that the following conditions 28 * are met: 29 * 1. Redistributions of source code must retain the above copyright 30 * notice, this list of conditions and the following disclaimer. 31 * 2. Redistributions in binary form must reproduce the above copyright 32 * notice, this list of conditions and the following disclaimer in the 33 * documentation and/or other materials provided with the distribution. 34 * 3. All advertising materials mentioning features or use of this software 35 * must display the following acknowledgement: 36 * This product includes software developed by the University of 37 * California, Berkeley and its contributors. 38 * 4. Neither the name of the University nor the names of its contributors 39 * may be used to endorse or promote products derived from this software 40 * without specific prior written permission. 41 * 42 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 43 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 44 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 45 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 46 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 47 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 48 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 49 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 50 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 51 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 52 * SUCH DAMAGE. 53 * 54 * from: Utah Hdr: vn.c 1.13 94/04/02 55 * 56 * from: @(#)vn.c 8.6 (Berkeley) 4/1/94 57 * From: src/sys/dev/vn/vn.c,v 1.122 2000/12/16 16:06:03 58 */ 59 60#include "opt_geom.h" 61#include "opt_md.h" 62 63#include <sys/param.h> 64#include <sys/systm.h> 65#include <sys/bio.h> 66#include <sys/conf.h> 67#include <sys/fcntl.h> 68#include <sys/kernel.h> 69#include <sys/kthread.h> 70#include <sys/linker.h> 71#include <sys/lock.h> 72#include <sys/malloc.h> 73#include <sys/mdioctl.h> 74#include <sys/mutex.h> 75#include <sys/namei.h> 76#include <sys/proc.h> 77#include <sys/queue.h> 78#include <sys/sf_buf.h> 79#include <sys/sysctl.h> 80#include <sys/vnode.h> 81 82#include <geom/geom.h> 83 84#include <vm/vm.h> 85#include <vm/vm_object.h> 86#include <vm/vm_page.h> 87#include <vm/vm_pager.h> 88#include <vm/swap_pager.h> 89#include <vm/uma.h> 90 91#define MD_MODVER 1 92 93#define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */ 94 95#ifndef MD_NSECT 96#define MD_NSECT (10000 * 2) 97#endif 98 99static MALLOC_DEFINE(M_MD, "MD disk", "Memory Disk"); 100static MALLOC_DEFINE(M_MDSECT, "MD sectors", "Memory Disk Sectors"); 101 102static int md_debug; 103SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, ""); 104 105#if defined(MD_ROOT) && defined(MD_ROOT_SIZE) 106/* Image gets put here: */ 107static u_char mfs_root[MD_ROOT_SIZE*1024] = "MFS Filesystem goes here"; 108static u_char end_mfs_root[] __unused = "MFS Filesystem had better STOP here"; 109#endif 110 111static g_init_t md_drvinit; 112 113static int mdunits; 114static dev_t status_dev = 0; 115 116static d_ioctl_t mdctlioctl; 117 118static struct cdevsw mdctl_cdevsw = { 119 .d_version = D_VERSION, 120 .d_flags = D_NEEDGIANT, 121 .d_ioctl = mdctlioctl, 122 .d_name = MD_NAME, 123}; 124 125 126static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(&md_softc_list); 127 128#define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 129#define NMASK (NINDIR-1) 130static int nshift; 131 132struct indir { 133 uintptr_t *array; 134 u_int total; 135 u_int used; 136 u_int shift; 137}; 138 139struct md_s { 140 int unit; 141 LIST_ENTRY(md_s) list; 142 struct bio_queue_head bio_queue; 143 struct mtx queue_mtx; 144 dev_t dev; 145 enum md_types type; 146 unsigned nsect; 147 unsigned opencount; 148 unsigned secsize; 149 unsigned fwheads; 150 unsigned fwsectors; 151 unsigned flags; 152 char name[20]; 153 struct proc *procp; 154 struct g_geom *gp; 155 struct g_provider *pp; 156 157 /* MD_MALLOC related fields */ 158 struct indir *indir; 159 uma_zone_t uma; 160 161 /* MD_PRELOAD related fields */ 162 u_char *pl_ptr; 163 unsigned pl_len; 164 165 /* MD_VNODE related fields */ 166 struct vnode *vnode; 167 struct ucred *cred; 168 169 /* MD_SWAP related fields */ 170 vm_object_t object; 171 unsigned npage; 172}; 173 174static int mddestroy(struct md_s *sc, struct thread *td); 175 176static struct indir * 177new_indir(u_int shift) 178{ 179 struct indir *ip; 180 181 ip = malloc(sizeof *ip, M_MD, M_NOWAIT | M_ZERO); 182 if (ip == NULL) 183 return (NULL); 184 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 185 M_MDSECT, M_NOWAIT | M_ZERO); 186 if (ip->array == NULL) { 187 free(ip, M_MD); 188 return (NULL); 189 } 190 ip->total = NINDIR; 191 ip->shift = shift; 192 return (ip); 193} 194 195static void 196del_indir(struct indir *ip) 197{ 198 199 free(ip->array, M_MDSECT); 200 free(ip, M_MD); 201} 202 203static void 204destroy_indir(struct md_s *sc, struct indir *ip) 205{ 206 int i; 207 208 for (i = 0; i < NINDIR; i++) { 209 if (!ip->array[i]) 210 continue; 211 if (ip->shift) 212 destroy_indir(sc, (struct indir*)(ip->array[i])); 213 else if (ip->array[i] > 255) 214 uma_zfree(sc->uma, (void *)(ip->array[i])); 215 } 216 del_indir(ip); 217} 218 219/* 220 * This function does the math and alloctes the top level "indir" structure 221 * for a device of "size" sectors. 222 */ 223 224static struct indir * 225dimension(off_t size) 226{ 227 off_t rcnt; 228 struct indir *ip; 229 int i, layer; 230 231 rcnt = size; 232 layer = 0; 233 while (rcnt > NINDIR) { 234 rcnt /= NINDIR; 235 layer++; 236 } 237 /* figure out log2(NINDIR) */ 238 for (i = NINDIR, nshift = -1; i; nshift++) 239 i >>= 1; 240 241 /* 242 * XXX: the top layer is probably not fully populated, so we allocate 243 * too much space for ip->array in here. 244 */ 245 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO); 246 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 247 M_MDSECT, M_WAITOK | M_ZERO); 248 ip->total = NINDIR; 249 ip->shift = layer * nshift; 250 return (ip); 251} 252 253/* 254 * Read a given sector 255 */ 256 257static uintptr_t 258s_read(struct indir *ip, off_t offset) 259{ 260 struct indir *cip; 261 int idx; 262 uintptr_t up; 263 264 if (md_debug > 1) 265 printf("s_read(%jd)\n", (intmax_t)offset); 266 up = 0; 267 for (cip = ip; cip != NULL;) { 268 if (cip->shift) { 269 idx = (offset >> cip->shift) & NMASK; 270 up = cip->array[idx]; 271 cip = (struct indir *)up; 272 continue; 273 } 274 idx = offset & NMASK; 275 return (cip->array[idx]); 276 } 277 return (0); 278} 279 280/* 281 * Write a given sector, prune the tree if the value is 0 282 */ 283 284static int 285s_write(struct indir *ip, off_t offset, uintptr_t ptr) 286{ 287 struct indir *cip, *lip[10]; 288 int idx, li; 289 uintptr_t up; 290 291 if (md_debug > 1) 292 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 293 up = 0; 294 li = 0; 295 cip = ip; 296 for (;;) { 297 lip[li++] = cip; 298 if (cip->shift) { 299 idx = (offset >> cip->shift) & NMASK; 300 up = cip->array[idx]; 301 if (up != 0) { 302 cip = (struct indir *)up; 303 continue; 304 } 305 /* Allocate branch */ 306 cip->array[idx] = 307 (uintptr_t)new_indir(cip->shift - nshift); 308 if (cip->array[idx] == 0) 309 return (ENOSPC); 310 cip->used++; 311 up = cip->array[idx]; 312 cip = (struct indir *)up; 313 continue; 314 } 315 /* leafnode */ 316 idx = offset & NMASK; 317 up = cip->array[idx]; 318 if (up != 0) 319 cip->used--; 320 cip->array[idx] = ptr; 321 if (ptr != 0) 322 cip->used++; 323 break; 324 } 325 if (cip->used != 0 || li == 1) 326 return (0); 327 li--; 328 while (cip->used == 0 && cip != ip) { 329 li--; 330 idx = (offset >> lip[li]->shift) & NMASK; 331 up = lip[li]->array[idx]; 332 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 333 del_indir(cip); 334 lip[li]->array[idx] = 0; 335 lip[li]->used--; 336 cip = lip[li]; 337 } 338 return (0); 339} 340 341 342struct g_class g_md_class = { 343 .name = "MD", 344 .init = md_drvinit, 345}; 346 347static int 348g_md_access(struct g_provider *pp, int r, int w, int e) 349{ 350 struct md_s *sc; 351 352 sc = pp->geom->softc; 353 if (sc == NULL) 354 return (ENXIO); 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 366static void 367g_md_start(struct bio *bp) 368{ 369 struct md_s *sc; 370 371 sc = bp->bio_to->geom->softc; 372 373 bp->bio_pblkno = bp->bio_offset / sc->secsize; 374 bp->bio_bcount = bp->bio_length; 375 mtx_lock(&sc->queue_mtx); 376 bioq_disksort(&sc->bio_queue, bp); 377 mtx_unlock(&sc->queue_mtx); 378 379 wakeup(sc); 380} 381 382DECLARE_GEOM_CLASS(g_md_class, g_md); 383 384 385static int 386mdstart_malloc(struct md_s *sc, struct bio *bp) 387{ 388 int i, error; 389 u_char *dst; 390 unsigned secno, nsec, uc; 391 uintptr_t sp, osp; 392 393 nsec = bp->bio_bcount / sc->secsize; 394 secno = bp->bio_pblkno; 395 dst = bp->bio_data; 396 error = 0; 397 while (nsec--) { 398 osp = s_read(sc->indir, secno); 399 if (bp->bio_cmd == BIO_DELETE) { 400 if (osp != 0) 401 error = s_write(sc->indir, secno, 0); 402 } else if (bp->bio_cmd == BIO_READ) { 403 if (osp == 0) 404 bzero(dst, sc->secsize); 405 else if (osp <= 255) 406 for (i = 0; i < sc->secsize; i++) 407 dst[i] = osp; 408 else 409 bcopy((void *)osp, dst, sc->secsize); 410 osp = 0; 411 } else if (bp->bio_cmd == BIO_WRITE) { 412 if (sc->flags & MD_COMPRESS) { 413 uc = dst[0]; 414 for (i = 1; i < sc->secsize; i++) 415 if (dst[i] != uc) 416 break; 417 } else { 418 i = 0; 419 uc = 0; 420 } 421 if (i == sc->secsize) { 422 if (osp != uc) 423 error = s_write(sc->indir, secno, uc); 424 } else { 425 if (osp <= 255) { 426 sp = (uintptr_t) uma_zalloc( 427 sc->uma, M_NOWAIT); 428 if (sp == 0) { 429 error = ENOSPC; 430 break; 431 } 432 bcopy(dst, (void *)sp, sc->secsize); 433 error = s_write(sc->indir, secno, sp); 434 } else { 435 bcopy(dst, (void *)osp, sc->secsize); 436 osp = 0; 437 } 438 } 439 } else { 440 error = EOPNOTSUPP; 441 } 442 if (osp > 255) 443 uma_zfree(sc->uma, (void*)osp); 444 if (error) 445 break; 446 secno++; 447 dst += sc->secsize; 448 } 449 bp->bio_resid = 0; 450 return (error); 451} 452 453static int 454mdstart_preload(struct md_s *sc, struct bio *bp) 455{ 456 457 if (bp->bio_cmd == BIO_DELETE) { 458 } else if (bp->bio_cmd == BIO_READ) { 459 bcopy(sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_data, bp->bio_bcount); 460 } else { 461 bcopy(bp->bio_data, sc->pl_ptr + (bp->bio_pblkno << DEV_BSHIFT), bp->bio_bcount); 462 } 463 bp->bio_resid = 0; 464 return (0); 465} 466 467static int 468mdstart_vnode(struct md_s *sc, struct bio *bp) 469{ 470 int error; 471 struct uio auio; 472 struct iovec aiov; 473 struct mount *mp; 474 475 /* 476 * VNODE I/O 477 * 478 * If an error occurs, we set BIO_ERROR but we do not set 479 * B_INVAL because (for a write anyway), the buffer is 480 * still valid. 481 */ 482 483 bzero(&auio, sizeof(auio)); 484 485 aiov.iov_base = bp->bio_data; 486 aiov.iov_len = bp->bio_bcount; 487 auio.uio_iov = &aiov; 488 auio.uio_iovcnt = 1; 489 auio.uio_offset = (vm_ooffset_t)bp->bio_pblkno * sc->secsize; 490 auio.uio_segflg = UIO_SYSSPACE; 491 if(bp->bio_cmd == BIO_READ) 492 auio.uio_rw = UIO_READ; 493 else if(bp->bio_cmd == BIO_WRITE) 494 auio.uio_rw = UIO_WRITE; 495 else 496 panic("wrong BIO_OP in mdstart_vnode"); 497 auio.uio_resid = bp->bio_bcount; 498 auio.uio_td = curthread; 499 /* 500 * When reading set IO_DIRECT to try to avoid double-caching 501 * the data. When writing IO_DIRECT is not optimal. 502 */ 503 if (bp->bio_cmd == BIO_READ) { 504 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 505 error = VOP_READ(sc->vnode, &auio, IO_DIRECT, sc->cred); 506 VOP_UNLOCK(sc->vnode, 0, curthread); 507 } else { 508 (void) vn_start_write(sc->vnode, &mp, V_WAIT); 509 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 510 error = VOP_WRITE(sc->vnode, &auio, 511 sc->flags & MD_ASYNC ? 0 : IO_SYNC, sc->cred); 512 VOP_UNLOCK(sc->vnode, 0, curthread); 513 vn_finished_write(mp); 514 } 515 bp->bio_resid = auio.uio_resid; 516 return (error); 517} 518 519static int 520mdstart_swap(struct md_s *sc, struct bio *bp) 521{ 522 struct sf_buf *sf; 523 int i, rv; 524 int offs, len, lastp, lastend; 525 vm_page_t m; 526 u_char *p; 527 528 p = bp->bio_data; 529 530 /* 531 * offs is the ofset at whih to start operating on the 532 * next (ie, first) page. lastp is the last page on 533 * which we're going to operate. lastend is the ending 534 * position within that last page (ie, PAGE_SIZE if 535 * we're operating on complete aligned pages). 536 */ 537 offs = bp->bio_offset % PAGE_SIZE; 538 lastp = (bp->bio_offset + bp->bio_length - 1) / PAGE_SIZE; 539 lastend = (bp->bio_offset + bp->bio_length - 1) % PAGE_SIZE + 1; 540 541 VM_OBJECT_LOCK(sc->object); 542 vm_object_pip_add(sc->object, 1); 543 for (i = bp->bio_offset / PAGE_SIZE; i <= lastp; i++) { 544 len = ((i == lastp) ? lastend : PAGE_SIZE) - offs; 545 546 m = vm_page_grab(sc->object, i, 547 VM_ALLOC_NORMAL|VM_ALLOC_RETRY); 548 VM_OBJECT_UNLOCK(sc->object); 549 sf = sf_buf_alloc(m); 550 VM_OBJECT_LOCK(sc->object); 551 if (bp->bio_cmd == BIO_READ) { 552 if (m->valid != VM_PAGE_BITS_ALL) 553 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 554 bcopy((void *)(sf_buf_kva(sf) + offs), p, len); 555 } else if (bp->bio_cmd == BIO_WRITE) { 556 if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL) 557 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 558 bcopy(p, (void *)(sf_buf_kva(sf) + offs), len); 559 m->valid = VM_PAGE_BITS_ALL; 560#if 0 561 } else if (bp->bio_cmd == BIO_DELETE) { 562 if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL) 563 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 564 bzero((void *)(sf_buf_kva(sf) + offs), len); 565 vm_page_dirty(m); 566 m->valid = VM_PAGE_BITS_ALL; 567#endif 568 } 569 sf_buf_free(sf); 570 vm_page_lock_queues(); 571 vm_page_wakeup(m); 572 vm_page_activate(m); 573 if (bp->bio_cmd == BIO_WRITE) 574 vm_page_dirty(m); 575 vm_page_unlock_queues(); 576 577 /* Actions on further pages start at offset 0 */ 578 p += PAGE_SIZE - offs; 579 offs = 0; 580#if 0 581if (bootverbose || bp->bio_offset / PAGE_SIZE < 17) 582printf("wire_count %d busy %d flags %x hold_count %d act_count %d queue %d valid %d dirty %d @ %d\n", 583 m->wire_count, m->busy, 584 m->flags, m->hold_count, m->act_count, m->queue, m->valid, m->dirty, i); 585#endif 586 } 587 vm_object_pip_subtract(sc->object, 1); 588 vm_object_set_writeable_dirty(sc->object); 589 VM_OBJECT_UNLOCK(sc->object); 590 return (0); 591} 592 593static void 594md_kthread(void *arg) 595{ 596 struct md_s *sc; 597 struct bio *bp; 598 int error, hasgiant; 599 600 sc = arg; 601 curthread->td_base_pri = PRIBIO; 602 603 switch (sc->type) { 604 case MD_VNODE: 605 mtx_lock(&Giant); 606 hasgiant = 1; 607 break; 608 case MD_MALLOC: 609 case MD_PRELOAD: 610 case MD_SWAP: 611 default: 612 hasgiant = 0; 613 break; 614 } 615 616 for (;;) { 617 mtx_lock(&sc->queue_mtx); 618 bp = bioq_first(&sc->bio_queue); 619 if (bp) 620 bioq_remove(&sc->bio_queue, bp); 621 if (!bp) { 622 if (sc->flags & MD_SHUTDOWN) { 623 mtx_unlock(&sc->queue_mtx); 624 sc->procp = NULL; 625 wakeup(&sc->procp); 626 if (hasgiant) 627 mtx_unlock(&Giant); 628 kthread_exit(0); 629 } 630 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 631 continue; 632 } 633 mtx_unlock(&sc->queue_mtx); 634 if (bp->bio_cmd == BIO_GETATTR) { 635 if (sc->fwsectors && sc->fwheads && 636 (g_handleattr_int(bp, "GEOM::fwsectors", 637 sc->fwsectors) || 638 g_handleattr_int(bp, "GEOM::fwheads", 639 sc->fwheads))) 640 error = -1; 641 else 642 error = EOPNOTSUPP; 643 } else { 644 switch (sc->type) { 645 case MD_MALLOC: 646 error = mdstart_malloc(sc, bp); 647 break; 648 case MD_PRELOAD: 649 error = mdstart_preload(sc, bp); 650 break; 651 case MD_VNODE: 652 error = mdstart_vnode(sc, bp); 653 break; 654 case MD_SWAP: 655 error = mdstart_swap(sc, bp); 656 break; 657 default: 658 panic("Impossible md(type)"); 659 break; 660 } 661 } 662 663 if (error != -1) { 664 bp->bio_completed = bp->bio_length; 665 g_io_deliver(bp, error); 666 } 667 } 668} 669 670static struct md_s * 671mdfind(int unit) 672{ 673 struct md_s *sc; 674 675 /* XXX: LOCK(unique unit numbers) */ 676 LIST_FOREACH(sc, &md_softc_list, list) { 677 if (sc->unit == unit) 678 break; 679 } 680 /* XXX: UNLOCK(unique unit numbers) */ 681 return (sc); 682} 683 684static struct md_s * 685mdnew(int unit) 686{ 687 struct md_s *sc; 688 int error, max = -1; 689 690 /* XXX: LOCK(unique unit numbers) */ 691 LIST_FOREACH(sc, &md_softc_list, list) { 692 if (sc->unit == unit) { 693 /* XXX: UNLOCK(unique unit numbers) */ 694 return (NULL); 695 } 696 if (sc->unit > max) 697 max = sc->unit; 698 } 699 if (unit == -1) 700 unit = max + 1; 701 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 702 sc->unit = unit; 703 bioq_init(&sc->bio_queue); 704 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 705 sprintf(sc->name, "md%d", unit); 706 error = kthread_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 707 if (error) { 708 free(sc, M_MD); 709 return (NULL); 710 } 711 LIST_INSERT_HEAD(&md_softc_list, sc, list); 712 /* XXX: UNLOCK(unique unit numbers) */ 713 return (sc); 714} 715 716static void 717mdinit(struct md_s *sc) 718{ 719 720 struct g_geom *gp; 721 struct g_provider *pp; 722 723 DROP_GIANT(); 724 g_topology_lock(); 725 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 726 gp->start = g_md_start; 727 gp->access = g_md_access; 728 gp->softc = sc; 729 pp = g_new_providerf(gp, "md%d", sc->unit); 730 pp->mediasize = (off_t)sc->nsect * sc->secsize; 731 pp->sectorsize = sc->secsize; 732 sc->gp = gp; 733 sc->pp = pp; 734 g_error_provider(pp, 0); 735 g_topology_unlock(); 736 PICKUP_GIANT(); 737} 738 739/* 740 * XXX: we should check that the range they feed us is mapped. 741 * XXX: we should implement read-only. 742 */ 743 744static int 745mdcreate_preload(struct md_ioctl *mdio) 746{ 747 struct md_s *sc; 748 749 if (mdio->md_size == 0) 750 return (EINVAL); 751 if (mdio->md_options & ~(MD_AUTOUNIT)) 752 return (EINVAL); 753 if (mdio->md_options & MD_AUTOUNIT) { 754 sc = mdnew(-1); 755 if (sc == NULL) 756 return (ENOMEM); 757 mdio->md_unit = sc->unit; 758 } else { 759 sc = mdnew(mdio->md_unit); 760 if (sc == NULL) 761 return (EBUSY); 762 } 763 sc->type = MD_PRELOAD; 764 sc->secsize = DEV_BSIZE; 765 sc->nsect = mdio->md_size; 766 sc->flags = mdio->md_options & MD_FORCE; 767 /* Cast to pointer size, then to pointer to avoid warning */ 768 sc->pl_ptr = (u_char *)(uintptr_t)mdio->md_base; 769 sc->pl_len = (mdio->md_size << DEV_BSHIFT); 770 mdinit(sc); 771 return (0); 772} 773 774 775static int 776mdcreate_malloc(struct md_ioctl *mdio) 777{ 778 struct md_s *sc; 779 off_t u; 780 uintptr_t sp; 781 int error; 782 783 error = 0; 784 if (mdio->md_size == 0) 785 return (EINVAL); 786 if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 787 return (EINVAL); 788 if (mdio->md_secsize != 0 && !powerof2(mdio->md_secsize)) 789 return (EINVAL); 790 /* Compression doesn't make sense if we have reserved space */ 791 if (mdio->md_options & MD_RESERVE) 792 mdio->md_options &= ~MD_COMPRESS; 793 if (mdio->md_options & MD_AUTOUNIT) { 794 sc = mdnew(-1); 795 if (sc == NULL) 796 return (ENOMEM); 797 mdio->md_unit = sc->unit; 798 } else { 799 sc = mdnew(mdio->md_unit); 800 if (sc == NULL) 801 return (EBUSY); 802 } 803 sc->type = MD_MALLOC; 804 if (mdio->md_secsize != 0) 805 sc->secsize = mdio->md_secsize; 806 else 807 sc->secsize = DEV_BSIZE; 808 if (mdio->md_fwsectors != 0) 809 sc->fwsectors = mdio->md_fwsectors; 810 if (mdio->md_fwheads != 0) 811 sc->fwheads = mdio->md_fwheads; 812 sc->nsect = mdio->md_size; 813 sc->nsect /= (sc->secsize / DEV_BSIZE); 814 sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE); 815 sc->indir = dimension(sc->nsect); 816 sc->uma = uma_zcreate(sc->name, sc->secsize, 817 NULL, NULL, NULL, NULL, 0x1ff, 0); 818 if (mdio->md_options & MD_RESERVE) { 819 for (u = 0; u < sc->nsect; u++) { 820 sp = (uintptr_t) uma_zalloc(sc->uma, M_NOWAIT | M_ZERO); 821 if (sp != 0) 822 error = s_write(sc->indir, u, sp); 823 else 824 error = ENOMEM; 825 if (error) 826 break; 827 } 828 } 829 if (error) { 830 mddestroy(sc, NULL); 831 return (error); 832 } 833 mdinit(sc); 834 if (!(mdio->md_options & MD_RESERVE)) 835 sc->pp->flags |= G_PF_CANDELETE; 836 return (0); 837} 838 839 840static int 841mdsetcred(struct md_s *sc, struct ucred *cred) 842{ 843 char *tmpbuf; 844 int error = 0; 845 846 /* 847 * Set credits in our softc 848 */ 849 850 if (sc->cred) 851 crfree(sc->cred); 852 sc->cred = crhold(cred); 853 854 /* 855 * Horrible kludge to establish credentials for NFS XXX. 856 */ 857 858 if (sc->vnode) { 859 struct uio auio; 860 struct iovec aiov; 861 862 tmpbuf = malloc(sc->secsize, M_TEMP, M_WAITOK); 863 bzero(&auio, sizeof(auio)); 864 865 aiov.iov_base = tmpbuf; 866 aiov.iov_len = sc->secsize; 867 auio.uio_iov = &aiov; 868 auio.uio_iovcnt = 1; 869 auio.uio_offset = 0; 870 auio.uio_rw = UIO_READ; 871 auio.uio_segflg = UIO_SYSSPACE; 872 auio.uio_resid = aiov.iov_len; 873 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 874 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 875 VOP_UNLOCK(sc->vnode, 0, curthread); 876 free(tmpbuf, M_TEMP); 877 } 878 return (error); 879} 880 881static int 882mdcreate_vnode(struct md_ioctl *mdio, struct thread *td) 883{ 884 struct md_s *sc; 885 struct vattr vattr; 886 struct nameidata nd; 887 int error, flags; 888 889 flags = FREAD|FWRITE; 890 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 891 error = vn_open(&nd, &flags, 0, -1); 892 if (error) { 893 if (error != EACCES && error != EPERM && error != EROFS) 894 return (error); 895 flags &= ~FWRITE; 896 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 897 error = vn_open(&nd, &flags, 0, -1); 898 if (error) 899 return (error); 900 } 901 NDFREE(&nd, NDF_ONLY_PNBUF); 902 if (nd.ni_vp->v_type != VREG || 903 (error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred, td))) { 904 VOP_UNLOCK(nd.ni_vp, 0, td); 905 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 906 return (error ? error : EINVAL); 907 } 908 VOP_UNLOCK(nd.ni_vp, 0, td); 909 910 if (mdio->md_options & MD_AUTOUNIT) { 911 sc = mdnew(-1); 912 mdio->md_unit = sc->unit; 913 } else { 914 sc = mdnew(mdio->md_unit); 915 } 916 if (sc == NULL) { 917 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 918 return (EBUSY); 919 } 920 921 if (mdio->md_fwsectors != 0) 922 sc->fwsectors = mdio->md_fwsectors; 923 if (mdio->md_fwheads != 0) 924 sc->fwheads = mdio->md_fwheads; 925 sc->type = MD_VNODE; 926 sc->flags = mdio->md_options & (MD_FORCE | MD_ASYNC); 927 if (!(flags & FWRITE)) 928 sc->flags |= MD_READONLY; 929 sc->secsize = DEV_BSIZE; 930 sc->vnode = nd.ni_vp; 931 932 /* 933 * If the size is specified, override the file attributes. 934 */ 935 if (mdio->md_size) 936 sc->nsect = mdio->md_size; 937 else 938 sc->nsect = vattr.va_size / sc->secsize; /* XXX: round up ? */ 939 if (sc->nsect == 0) { 940 mddestroy(sc, td); 941 return (EINVAL); 942 } 943 error = mdsetcred(sc, td->td_ucred); 944 if (error) { 945 mddestroy(sc, td); 946 return (error); 947 } 948 mdinit(sc); 949 return (0); 950} 951 952static void 953md_zapit(void *p, int cancel) 954{ 955 if (cancel) 956 return; 957 g_wither_geom(p, ENXIO); 958} 959 960static int 961mddestroy(struct md_s *sc, struct thread *td) 962{ 963 964 GIANT_REQUIRED; 965 966 mtx_destroy(&sc->queue_mtx); 967 if (sc->gp) { 968 sc->gp->softc = NULL; 969 g_waitfor_event(md_zapit, sc->gp, M_WAITOK, sc->gp, NULL); 970 sc->gp = NULL; 971 sc->pp = NULL; 972 } 973 sc->flags |= MD_SHUTDOWN; 974 wakeup(sc); 975 while (sc->procp != NULL) 976 tsleep(&sc->procp, PRIBIO, "mddestroy", hz / 10); 977 if (sc->vnode != NULL) 978 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 979 FREAD : (FREAD|FWRITE), sc->cred, td); 980 if (sc->cred != NULL) 981 crfree(sc->cred); 982 if (sc->object != NULL) { 983 vm_object_deallocate(sc->object); 984 } 985 if (sc->indir) 986 destroy_indir(sc, sc->indir); 987 if (sc->uma) 988 uma_zdestroy(sc->uma); 989 990 /* XXX: LOCK(unique unit numbers) */ 991 LIST_REMOVE(sc, list); 992 /* XXX: UNLOCK(unique unit numbers) */ 993 free(sc, M_MD); 994 return (0); 995} 996 997static int 998mdcreate_swap(struct md_ioctl *mdio, struct thread *td) 999{ 1000 int error; 1001 struct md_s *sc; 1002 1003 GIANT_REQUIRED; 1004 1005 if (mdio->md_options & MD_AUTOUNIT) { 1006 sc = mdnew(-1); 1007 mdio->md_unit = sc->unit; 1008 } else { 1009 sc = mdnew(mdio->md_unit); 1010 } 1011 if (sc == NULL) 1012 return (EBUSY); 1013 1014 sc->type = MD_SWAP; 1015 1016 /* 1017 * Range check. Disallow negative sizes or any size less then the 1018 * size of a page. Then round to a page. 1019 */ 1020 1021 if (mdio->md_size == 0) { 1022 mddestroy(sc, td); 1023 return (EDOM); 1024 } 1025 1026 /* 1027 * Allocate an OBJT_SWAP object. 1028 * 1029 * sc_nsect is in units of DEV_BSIZE. 1030 * sc_npage is in units of PAGE_SIZE. 1031 * 1032 * Note the truncation. 1033 */ 1034 1035 sc->secsize = DEV_BSIZE; 1036 sc->npage = mdio->md_size / (PAGE_SIZE / DEV_BSIZE); 1037 sc->nsect = sc->npage * (PAGE_SIZE / DEV_BSIZE); 1038 if (mdio->md_fwsectors != 0) 1039 sc->fwsectors = mdio->md_fwsectors; 1040 if (mdio->md_fwheads != 0) 1041 sc->fwheads = mdio->md_fwheads; 1042 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * 1043 (vm_offset_t)sc->npage, VM_PROT_DEFAULT, 0); 1044 sc->flags = mdio->md_options & MD_FORCE; 1045 if (mdio->md_options & MD_RESERVE) { 1046 if (swap_pager_reserve(sc->object, 0, sc->npage) < 0) { 1047 vm_object_deallocate(sc->object); 1048 sc->object = NULL; 1049 mddestroy(sc, td); 1050 return (EDOM); 1051 } 1052 } 1053 error = mdsetcred(sc, td->td_ucred); 1054 if (error) { 1055 mddestroy(sc, td); 1056 return (error); 1057 } 1058 mdinit(sc); 1059 if (!(mdio->md_options & MD_RESERVE)) 1060 sc->pp->flags |= G_PF_CANDELETE; 1061 return (0); 1062} 1063 1064static int 1065mddetach(int unit, struct thread *td) 1066{ 1067 struct md_s *sc; 1068 1069 sc = mdfind(unit); 1070 if (sc == NULL) 1071 return (ENOENT); 1072 if (sc->opencount != 0 && !(sc->flags & MD_FORCE)) 1073 return (EBUSY); 1074 switch(sc->type) { 1075 case MD_VNODE: 1076 case MD_SWAP: 1077 case MD_MALLOC: 1078 case MD_PRELOAD: 1079 return (mddestroy(sc, td)); 1080 default: 1081 return (EOPNOTSUPP); 1082 } 1083} 1084 1085static int 1086mdctlioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 1087{ 1088 struct md_ioctl *mdio; 1089 struct md_s *sc; 1090 int i; 1091 1092 if (md_debug) 1093 printf("mdctlioctl(%s %lx %p %x %p)\n", 1094 devtoname(dev), cmd, addr, flags, td); 1095 1096 /* 1097 * We assert the version number in the individual ioctl 1098 * handlers instead of out here because (a) it is possible we 1099 * may add another ioctl in the future which doesn't read an 1100 * mdio, and (b) the correct return value for an unknown ioctl 1101 * is ENOIOCTL, not EINVAL. 1102 */ 1103 mdio = (struct md_ioctl *)addr; 1104 switch (cmd) { 1105 case MDIOCATTACH: 1106 if (mdio->md_version != MDIOVERSION) 1107 return (EINVAL); 1108 switch (mdio->md_type) { 1109 case MD_MALLOC: 1110 return (mdcreate_malloc(mdio)); 1111 case MD_PRELOAD: 1112 return (mdcreate_preload(mdio)); 1113 case MD_VNODE: 1114 return (mdcreate_vnode(mdio, td)); 1115 case MD_SWAP: 1116 return (mdcreate_swap(mdio, td)); 1117 default: 1118 return (EINVAL); 1119 } 1120 case MDIOCDETACH: 1121 if (mdio->md_version != MDIOVERSION) 1122 return (EINVAL); 1123 if (mdio->md_file != NULL || mdio->md_size != 0 || 1124 mdio->md_options != 0) 1125 return (EINVAL); 1126 return (mddetach(mdio->md_unit, td)); 1127 case MDIOCQUERY: 1128 if (mdio->md_version != MDIOVERSION) 1129 return (EINVAL); 1130 sc = mdfind(mdio->md_unit); 1131 if (sc == NULL) 1132 return (ENOENT); 1133 mdio->md_type = sc->type; 1134 mdio->md_options = sc->flags; 1135 switch (sc->type) { 1136 case MD_MALLOC: 1137 mdio->md_size = sc->nsect; 1138 break; 1139 case MD_PRELOAD: 1140 mdio->md_size = sc->nsect; 1141 mdio->md_base = (uint64_t)(intptr_t)sc->pl_ptr; 1142 break; 1143 case MD_SWAP: 1144 mdio->md_size = sc->nsect; 1145 break; 1146 case MD_VNODE: 1147 mdio->md_size = sc->nsect; 1148 /* XXX fill this in */ 1149 mdio->md_file = NULL; 1150 break; 1151 } 1152 return (0); 1153 case MDIOCLIST: 1154 i = 1; 1155 LIST_FOREACH(sc, &md_softc_list, list) { 1156 if (i == MDNPAD - 1) 1157 mdio->md_pad[i] = -1; 1158 else 1159 mdio->md_pad[i++] = sc->unit; 1160 } 1161 mdio->md_pad[0] = i - 1; 1162 return (0); 1163 default: 1164 return (ENOIOCTL); 1165 }; 1166 return (ENOIOCTL); 1167} 1168 1169static void 1170md_preloaded(u_char *image, unsigned length) 1171{ 1172 struct md_s *sc; 1173 1174 sc = mdnew(-1); 1175 if (sc == NULL) 1176 return; 1177 sc->type = MD_PRELOAD; 1178 sc->secsize = DEV_BSIZE; 1179 sc->nsect = length / DEV_BSIZE; 1180 sc->pl_ptr = image; 1181 sc->pl_len = length; 1182#ifdef MD_ROOT 1183 if (sc->unit == 0) 1184 rootdevnames[0] = "ufs:/dev/md0"; 1185#endif 1186 mdinit(sc); 1187} 1188 1189static void 1190md_drvinit(struct g_class *mp __unused) 1191{ 1192 1193 caddr_t mod; 1194 caddr_t c; 1195 u_char *ptr, *name, *type; 1196 unsigned len; 1197 1198 mod = NULL; 1199 g_topology_unlock(); 1200#ifdef MD_ROOT_SIZE 1201 md_preloaded(mfs_root, MD_ROOT_SIZE*1024); 1202#endif 1203 while ((mod = preload_search_next_name(mod)) != NULL) { 1204 name = (char *)preload_search_info(mod, MODINFO_NAME); 1205 type = (char *)preload_search_info(mod, MODINFO_TYPE); 1206 if (name == NULL) 1207 continue; 1208 if (type == NULL) 1209 continue; 1210 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 1211 continue; 1212 c = preload_search_info(mod, MODINFO_ADDR); 1213 ptr = *(u_char **)c; 1214 c = preload_search_info(mod, MODINFO_SIZE); 1215 len = *(size_t *)c; 1216 printf("%s%d: Preloaded image <%s> %d bytes at %p\n", 1217 MD_NAME, mdunits, name, len, ptr); 1218 md_preloaded(ptr, len); 1219 } 1220 status_dev = make_dev(&mdctl_cdevsw, 0xffff00ff, UID_ROOT, GID_WHEEL, 1221 0600, MDCTL_NAME); 1222 g_topology_lock(); 1223} 1224 1225static int 1226md_modevent(module_t mod, int type, void *data) 1227{ 1228 int error; 1229 struct md_s *sc; 1230 1231 switch (type) { 1232 case MOD_LOAD: 1233 break; 1234 case MOD_UNLOAD: 1235 LIST_FOREACH(sc, &md_softc_list, list) { 1236 error = mddetach(sc->unit, curthread); 1237 if (error != 0) 1238 return (error); 1239 } 1240 if (status_dev) 1241 destroy_dev(status_dev); 1242 status_dev = 0; 1243 break; 1244 default: 1245 break; 1246 } 1247 return (0); 1248} 1249 1250static moduledata_t md_mod = { 1251 MD_NAME, 1252 md_modevent, 1253 NULL 1254}; 1255DECLARE_MODULE(md, md_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE); 1256MODULE_VERSION(md, MD_MODVER); 1257