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sys/dev/md/md.c
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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: releng/6.0/sys/dev/md/md.c 151065 2005-10-07 15:08:41Z phk $ 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/sx.h> 72 #include <sys/namei.h> 73 #include <sys/proc.h> 74 #include <sys/queue.h> 75 #include <sys/sched.h> 76 #include <sys/sf_buf.h> 77 #include <sys/sysctl.h> 78 #include <sys/vnode.h> 79 80 #include <geom/geom.h> 81 82 #include <vm/vm.h> 83 #include <vm/vm_object.h> 84 #include <vm/vm_page.h> 85 #include <vm/vm_pager.h> 86 #include <vm/swap_pager.h> 87 #include <vm/uma.h> 88 89 #define MD_MODVER 1 90 91 #define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */ 92 93 #ifndef MD_NSECT 94 #define MD_NSECT (10000 * 2) 95 #endif 96 97 static MALLOC_DEFINE(M_MD, "MD disk", "Memory Disk"); 98 static MALLOC_DEFINE(M_MDSECT, "MD sectors", "Memory Disk Sectors"); 99 100 static int md_debug; 101 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, ""); 102 103 #if defined(MD_ROOT) && defined(MD_ROOT_SIZE) 104 /* Image gets put here: */ 105 static u_char mfs_root[MD_ROOT_SIZE*1024] = "MFS Filesystem goes here"; 106 static u_char end_mfs_root[] __unused = "MFS Filesystem had better STOP here"; 107 #endif 108 109 static g_init_t g_md_init; 110 static g_fini_t g_md_fini; 111 static g_start_t g_md_start; 112 static g_access_t g_md_access; 113 114 static int mdunits; 115 static struct cdev *status_dev = 0; 116 static struct sx md_sx; 117 118 static d_ioctl_t mdctlioctl; 119 120 static struct cdevsw mdctl_cdevsw = { 121 .d_version = D_VERSION, 122 .d_ioctl = mdctlioctl, 123 .d_name = MD_NAME, 124 }; 125 126 struct g_class g_md_class = { 127 .name = "MD", 128 .version = G_VERSION, 129 .init = g_md_init, 130 .fini = g_md_fini, 131 .start = g_md_start, 132 .access = g_md_access, 133 }; 134 135 DECLARE_GEOM_CLASS(g_md_class, g_md); 136 137 138 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(&md_softc_list); 139 140 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 141 #define NMASK (NINDIR-1) 142 static int nshift; 143 144 struct indir { 145 uintptr_t *array; 146 u_int total; 147 u_int used; 148 u_int shift; 149 }; 150 151 struct md_s { 152 int unit; 153 LIST_ENTRY(md_s) list; 154 struct bio_queue_head bio_queue; 155 struct mtx queue_mtx; 156 struct cdev *dev; 157 enum md_types type; 158 off_t mediasize; 159 unsigned sectorsize; 160 unsigned opencount; 161 unsigned fwheads; 162 unsigned fwsectors; 163 unsigned flags; 164 char name[20]; 165 struct proc *procp; 166 struct g_geom *gp; 167 struct g_provider *pp; 168 int (*start)(struct md_s *sc, struct bio *bp); 169 170 /* MD_MALLOC related fields */ 171 struct indir *indir; 172 uma_zone_t uma; 173 174 /* MD_PRELOAD related fields */ 175 u_char *pl_ptr; 176 size_t pl_len; 177 178 /* MD_VNODE related fields */ 179 struct vnode *vnode; 180 char file[PATH_MAX]; 181 struct ucred *cred; 182 183 /* MD_SWAP related fields */ 184 vm_object_t object; 185 }; 186 187 static struct indir * 188 new_indir(u_int shift) 189 { 190 struct indir *ip; 191 192 ip = malloc(sizeof *ip, M_MD, M_NOWAIT | M_ZERO); 193 if (ip == NULL) 194 return (NULL); 195 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 196 M_MDSECT, M_NOWAIT | M_ZERO); 197 if (ip->array == NULL) { 198 free(ip, M_MD); 199 return (NULL); 200 } 201 ip->total = NINDIR; 202 ip->shift = shift; 203 return (ip); 204 } 205 206 static void 207 del_indir(struct indir *ip) 208 { 209 210 free(ip->array, M_MDSECT); 211 free(ip, M_MD); 212 } 213 214 static void 215 destroy_indir(struct md_s *sc, struct indir *ip) 216 { 217 int i; 218 219 for (i = 0; i < NINDIR; i++) { 220 if (!ip->array[i]) 221 continue; 222 if (ip->shift) 223 destroy_indir(sc, (struct indir*)(ip->array[i])); 224 else if (ip->array[i] > 255) 225 uma_zfree(sc->uma, (void *)(ip->array[i])); 226 } 227 del_indir(ip); 228 } 229 230 /* 231 * This function does the math and alloctes the top level "indir" structure 232 * for a device of "size" sectors. 233 */ 234 235 static struct indir * 236 dimension(off_t size) 237 { 238 off_t rcnt; 239 struct indir *ip; 240 int i, layer; 241 242 rcnt = size; 243 layer = 0; 244 while (rcnt > NINDIR) { 245 rcnt /= NINDIR; 246 layer++; 247 } 248 /* figure out log2(NINDIR) */ 249 for (i = NINDIR, nshift = -1; i; nshift++) 250 i >>= 1; 251 252 /* 253 * XXX: the top layer is probably not fully populated, so we allocate 254 * too much space for ip->array in here. 255 */ 256 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO); 257 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 258 M_MDSECT, M_WAITOK | M_ZERO); 259 ip->total = NINDIR; 260 ip->shift = layer * nshift; 261 return (ip); 262 } 263 264 /* 265 * Read a given sector 266 */ 267 268 static uintptr_t 269 s_read(struct indir *ip, off_t offset) 270 { 271 struct indir *cip; 272 int idx; 273 uintptr_t up; 274 275 if (md_debug > 1) 276 printf("s_read(%jd)\n", (intmax_t)offset); 277 up = 0; 278 for (cip = ip; cip != NULL;) { 279 if (cip->shift) { 280 idx = (offset >> cip->shift) & NMASK; 281 up = cip->array[idx]; 282 cip = (struct indir *)up; 283 continue; 284 } 285 idx = offset & NMASK; 286 return (cip->array[idx]); 287 } 288 return (0); 289 } 290 291 /* 292 * Write a given sector, prune the tree if the value is 0 293 */ 294 295 static int 296 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 297 { 298 struct indir *cip, *lip[10]; 299 int idx, li; 300 uintptr_t up; 301 302 if (md_debug > 1) 303 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 304 up = 0; 305 li = 0; 306 cip = ip; 307 for (;;) { 308 lip[li++] = cip; 309 if (cip->shift) { 310 idx = (offset >> cip->shift) & NMASK; 311 up = cip->array[idx]; 312 if (up != 0) { 313 cip = (struct indir *)up; 314 continue; 315 } 316 /* Allocate branch */ 317 cip->array[idx] = 318 (uintptr_t)new_indir(cip->shift - nshift); 319 if (cip->array[idx] == 0) 320 return (ENOSPC); 321 cip->used++; 322 up = cip->array[idx]; 323 cip = (struct indir *)up; 324 continue; 325 } 326 /* leafnode */ 327 idx = offset & NMASK; 328 up = cip->array[idx]; 329 if (up != 0) 330 cip->used--; 331 cip->array[idx] = ptr; 332 if (ptr != 0) 333 cip->used++; 334 break; 335 } 336 if (cip->used != 0 || li == 1) 337 return (0); 338 li--; 339 while (cip->used == 0 && cip != ip) { 340 li--; 341 idx = (offset >> lip[li]->shift) & NMASK; 342 up = lip[li]->array[idx]; 343 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 344 del_indir(cip); 345 lip[li]->array[idx] = 0; 346 lip[li]->used--; 347 cip = lip[li]; 348 } 349 return (0); 350 } 351 352 353 static int 354 g_md_access(struct g_provider *pp, int r, int w, int e) 355 { 356 struct md_s *sc; 357 358 sc = pp->geom->softc; 359 if (sc == NULL) 360 return (ENXIO); 361 r += pp->acr; 362 w += pp->acw; 363 e += pp->ace; 364 if ((sc->flags & MD_READONLY) != 0 && w > 0) 365 return (EROFS); 366 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 367 sc->opencount = 1; 368 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 369 sc->opencount = 0; 370 } 371 return (0); 372 } 373 374 static void 375 g_md_start(struct bio *bp) 376 { 377 struct md_s *sc; 378 379 sc = bp->bio_to->geom->softc; 380 mtx_lock(&sc->queue_mtx); 381 bioq_disksort(&sc->bio_queue, bp); 382 mtx_unlock(&sc->queue_mtx); 383 wakeup(sc); 384 } 385 386 static int 387 mdstart_malloc(struct md_s *sc, struct bio *bp) 388 { 389 int i, error; 390 u_char *dst; 391 off_t secno, nsec, uc; 392 uintptr_t sp, osp; 393 394 nsec = bp->bio_length / sc->sectorsize; 395 secno = bp->bio_offset / sc->sectorsize; 396 dst = bp->bio_data; 397 error = 0; 398 while (nsec--) { 399 osp = s_read(sc->indir, secno); 400 if (bp->bio_cmd == BIO_DELETE) { 401 if (osp != 0) 402 error = s_write(sc->indir, secno, 0); 403 } else if (bp->bio_cmd == BIO_READ) { 404 if (osp == 0) 405 bzero(dst, sc->sectorsize); 406 else if (osp <= 255) 407 for (i = 0; i < sc->sectorsize; i++) 408 dst[i] = osp; 409 else 410 bcopy((void *)osp, dst, sc->sectorsize); 411 osp = 0; 412 } else if (bp->bio_cmd == BIO_WRITE) { 413 if (sc->flags & MD_COMPRESS) { 414 uc = dst[0]; 415 for (i = 1; i < sc->sectorsize; i++) 416 if (dst[i] != uc) 417 break; 418 } else { 419 i = 0; 420 uc = 0; 421 } 422 if (i == sc->sectorsize) { 423 if (osp != uc) 424 error = s_write(sc->indir, secno, uc); 425 } else { 426 if (osp <= 255) { 427 sp = (uintptr_t)uma_zalloc(sc->uma, 428 M_NOWAIT); 429 if (sp == 0) { 430 error = ENOSPC; 431 break; 432 } 433 bcopy(dst, (void *)sp, sc->sectorsize); 434 error = s_write(sc->indir, secno, sp); 435 } else { 436 bcopy(dst, (void *)osp, sc->sectorsize); 437 osp = 0; 438 } 439 } 440 } else { 441 error = EOPNOTSUPP; 442 } 443 if (osp > 255) 444 uma_zfree(sc->uma, (void*)osp); 445 if (error != 0) 446 break; 447 secno++; 448 dst += sc->sectorsize; 449 } 450 bp->bio_resid = 0; 451 return (error); 452 } 453 454 static int 455 mdstart_preload(struct md_s *sc, struct bio *bp) 456 { 457 458 switch (bp->bio_cmd) { 459 case BIO_READ: 460 bcopy(sc->pl_ptr + bp->bio_offset, bp->bio_data, 461 bp->bio_length); 462 break; 463 case BIO_WRITE: 464 bcopy(bp->bio_data, sc->pl_ptr + bp->bio_offset, 465 bp->bio_length); 466 break; 467 } 468 bp->bio_resid = 0; 469 return (0); 470 } 471 472 static int 473 mdstart_vnode(struct md_s *sc, struct bio *bp) 474 { 475 int error; 476 struct uio auio; 477 struct iovec aiov; 478 struct mount *mp; 479 480 mtx_assert(&Giant, MA_OWNED); 481 /* 482 * VNODE I/O 483 * 484 * If an error occurs, we set BIO_ERROR but we do not set 485 * B_INVAL because (for a write anyway), the buffer is 486 * still valid. 487 */ 488 489 bzero(&auio, sizeof(auio)); 490 491 aiov.iov_base = bp->bio_data; 492 aiov.iov_len = bp->bio_length; 493 auio.uio_iov = &aiov; 494 auio.uio_iovcnt = 1; 495 auio.uio_offset = (vm_ooffset_t)bp->bio_offset; 496 auio.uio_segflg = UIO_SYSSPACE; 497 if(bp->bio_cmd == BIO_READ) 498 auio.uio_rw = UIO_READ; 499 else if(bp->bio_cmd == BIO_WRITE) 500 auio.uio_rw = UIO_WRITE; 501 else 502 panic("wrong BIO_OP in mdstart_vnode"); 503 auio.uio_resid = bp->bio_length; 504 auio.uio_td = curthread; 505 /* 506 * When reading set IO_DIRECT to try to avoid double-caching 507 * the data. When writing IO_DIRECT is not optimal. 508 */ 509 if (bp->bio_cmd == BIO_READ) { 510 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 511 error = VOP_READ(sc->vnode, &auio, IO_DIRECT, sc->cred); 512 VOP_UNLOCK(sc->vnode, 0, curthread); 513 } else { 514 (void) vn_start_write(sc->vnode, &mp, V_WAIT); 515 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 516 error = VOP_WRITE(sc->vnode, &auio, 517 sc->flags & MD_ASYNC ? 0 : IO_SYNC, sc->cred); 518 VOP_UNLOCK(sc->vnode, 0, curthread); 519 vn_finished_write(mp); 520 } 521 bp->bio_resid = auio.uio_resid; 522 return (error); 523 } 524 525 static int 526 mdstart_swap(struct md_s *sc, struct bio *bp) 527 { 528 struct sf_buf *sf; 529 int rv, offs, len, lastend; 530 vm_pindex_t i, lastp; 531 vm_page_t m; 532 u_char *p; 533 534 p = bp->bio_data; 535 536 /* 537 * offs is the ofset at whih to start operating on the 538 * next (ie, first) page. lastp is the last page on 539 * which we're going to operate. lastend is the ending 540 * position within that last page (ie, PAGE_SIZE if 541 * we're operating on complete aligned pages). 542 */ 543 offs = bp->bio_offset % PAGE_SIZE; 544 lastp = (bp->bio_offset + bp->bio_length - 1) / PAGE_SIZE; 545 lastend = (bp->bio_offset + bp->bio_length - 1) % PAGE_SIZE + 1; 546 547 rv = VM_PAGER_OK; 548 VM_OBJECT_LOCK(sc->object); 549 vm_object_pip_add(sc->object, 1); 550 for (i = bp->bio_offset / PAGE_SIZE; i <= lastp; i++) { 551 len = ((i == lastp) ? lastend : PAGE_SIZE) - offs; 552 553 m = vm_page_grab(sc->object, i, 554 VM_ALLOC_NORMAL|VM_ALLOC_RETRY); 555 VM_OBJECT_UNLOCK(sc->object); 556 sched_pin(); 557 sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 558 VM_OBJECT_LOCK(sc->object); 559 if (bp->bio_cmd == BIO_READ) { 560 if (m->valid != VM_PAGE_BITS_ALL) 561 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 562 if (rv == VM_PAGER_ERROR) { 563 sf_buf_free(sf); 564 sched_unpin(); 565 vm_page_lock_queues(); 566 vm_page_wakeup(m); 567 vm_page_unlock_queues(); 568 break; 569 } 570 bcopy((void *)(sf_buf_kva(sf) + offs), p, len); 571 } else if (bp->bio_cmd == BIO_WRITE) { 572 if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL) 573 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 574 if (rv == VM_PAGER_ERROR) { 575 sf_buf_free(sf); 576 sched_unpin(); 577 vm_page_lock_queues(); 578 vm_page_wakeup(m); 579 vm_page_unlock_queues(); 580 break; 581 } 582 bcopy(p, (void *)(sf_buf_kva(sf) + offs), len); 583 m->valid = VM_PAGE_BITS_ALL; 584 #if 0 585 } else if (bp->bio_cmd == BIO_DELETE) { 586 if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL) 587 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 588 if (rv == VM_PAGER_ERROR) { 589 sf_buf_free(sf); 590 sched_unpin(); 591 vm_page_lock_queues(); 592 vm_page_wakeup(m); 593 vm_page_unlock_queues(); 594 break; 595 } 596 bzero((void *)(sf_buf_kva(sf) + offs), len); 597 vm_page_dirty(m); 598 m->valid = VM_PAGE_BITS_ALL; 599 #endif 600 } 601 sf_buf_free(sf); 602 sched_unpin(); 603 vm_page_lock_queues(); 604 vm_page_wakeup(m); 605 vm_page_activate(m); 606 if (bp->bio_cmd == BIO_WRITE) 607 vm_page_dirty(m); 608 vm_page_unlock_queues(); 609 610 /* Actions on further pages start at offset 0 */ 611 p += PAGE_SIZE - offs; 612 offs = 0; 613 #if 0 614 if (bootverbose || bp->bio_offset / PAGE_SIZE < 17) 615 printf("wire_count %d busy %d flags %x hold_count %d act_count %d queue %d valid %d dirty %d @ %d\n", 616 m->wire_count, m->busy, 617 m->flags, m->hold_count, m->act_count, m->queue, m->valid, m->dirty, i); 618 #endif 619 } 620 vm_object_pip_subtract(sc->object, 1); 621 vm_object_set_writeable_dirty(sc->object); 622 VM_OBJECT_UNLOCK(sc->object); 623 return (rv != VM_PAGER_ERROR ? 0 : ENOSPC); 624 } 625 626 static void 627 md_kthread(void *arg) 628 { 629 struct md_s *sc; 630 struct bio *bp; 631 int error, hasgiant; 632 633 sc = arg; 634 mtx_lock_spin(&sched_lock); 635 sched_prio(curthread, PRIBIO); 636 mtx_unlock_spin(&sched_lock); 637 638 switch (sc->type) { 639 case MD_VNODE: 640 mtx_lock(&Giant); 641 hasgiant = 1; 642 break; 643 case MD_MALLOC: 644 case MD_PRELOAD: 645 case MD_SWAP: 646 default: 647 hasgiant = 0; 648 break; 649 } 650 651 for (;;) { 652 if (sc->flags & MD_SHUTDOWN) { 653 sc->procp = NULL; 654 wakeup(&sc->procp); 655 if (hasgiant) 656 mtx_unlock(&Giant); 657 kthread_exit(0); 658 } 659 mtx_lock(&sc->queue_mtx); 660 bp = bioq_takefirst(&sc->bio_queue); 661 if (!bp) { 662 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 663 continue; 664 } 665 mtx_unlock(&sc->queue_mtx); 666 if (bp->bio_cmd == BIO_GETATTR) { 667 if (sc->fwsectors && sc->fwheads && 668 (g_handleattr_int(bp, "GEOM::fwsectors", 669 sc->fwsectors) || 670 g_handleattr_int(bp, "GEOM::fwheads", 671 sc->fwheads))) 672 error = -1; 673 else 674 error = EOPNOTSUPP; 675 } else { 676 error = sc->start(sc, bp); 677 } 678 679 if (error != -1) { 680 bp->bio_completed = bp->bio_length; 681 g_io_deliver(bp, error); 682 } 683 } 684 } 685 686 static struct md_s * 687 mdfind(int unit) 688 { 689 struct md_s *sc; 690 691 LIST_FOREACH(sc, &md_softc_list, list) { 692 if (sc->unit == unit) 693 break; 694 } 695 return (sc); 696 } 697 698 static struct md_s * 699 mdnew(int unit, int *errp, enum md_types type) 700 { 701 struct md_s *sc, *sc2; 702 int error, max = -1; 703 704 *errp = 0; 705 LIST_FOREACH(sc2, &md_softc_list, list) { 706 if (unit == sc2->unit) { 707 *errp = EBUSY; 708 return (NULL); 709 } 710 if (unit == -1 && sc2->unit > max) 711 max = sc2->unit; 712 } 713 if (unit == -1) 714 unit = max + 1; 715 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 716 sc->type = type; 717 bioq_init(&sc->bio_queue); 718 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 719 sc->unit = unit; 720 sprintf(sc->name, "md%d", unit); 721 LIST_INSERT_HEAD(&md_softc_list, sc, list); 722 error = kthread_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 723 if (error == 0) 724 return (sc); 725 LIST_REMOVE(sc, list); 726 mtx_destroy(&sc->queue_mtx); 727 free(sc, M_MD); 728 *errp = error; 729 return (NULL); 730 } 731 732 static void 733 mdinit(struct md_s *sc) 734 { 735 736 struct g_geom *gp; 737 struct g_provider *pp; 738 739 g_topology_lock(); 740 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 741 gp->softc = sc; 742 pp = g_new_providerf(gp, "md%d", sc->unit); 743 pp->mediasize = sc->mediasize; 744 pp->sectorsize = sc->sectorsize; 745 sc->gp = gp; 746 sc->pp = pp; 747 g_error_provider(pp, 0); 748 g_topology_unlock(); 749 } 750 751 /* 752 * XXX: we should check that the range they feed us is mapped. 753 * XXX: we should implement read-only. 754 */ 755 756 static int 757 mdcreate_preload(struct md_s *sc, struct md_ioctl *mdio) 758 { 759 760 if (mdio->md_options & ~(MD_AUTOUNIT | MD_FORCE)) 761 return (EINVAL); 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 = (size_t)sc->mediasize; 766 return (0); 767 } 768 769 770 static int 771 mdcreate_malloc(struct md_s *sc, struct md_ioctl *mdio) 772 { 773 uintptr_t sp; 774 int error; 775 off_t u; 776 777 error = 0; 778 if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 779 return (EINVAL); 780 if (mdio->md_sectorsize != 0 && !powerof2(mdio->md_sectorsize)) 781 return (EINVAL); 782 /* Compression doesn't make sense if we have reserved space */ 783 if (mdio->md_options & MD_RESERVE) 784 mdio->md_options &= ~MD_COMPRESS; 785 if (mdio->md_fwsectors != 0) 786 sc->fwsectors = mdio->md_fwsectors; 787 if (mdio->md_fwheads != 0) 788 sc->fwheads = mdio->md_fwheads; 789 sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE); 790 sc->indir = dimension(sc->mediasize / sc->sectorsize); 791 sc->uma = uma_zcreate(sc->name, sc->sectorsize, NULL, NULL, NULL, NULL, 792 0x1ff, 0); 793 if (mdio->md_options & MD_RESERVE) { 794 off_t nsectors; 795 796 nsectors = sc->mediasize / sc->sectorsize; 797 for (u = 0; u < nsectors; u++) { 798 sp = (uintptr_t)uma_zalloc(sc->uma, M_NOWAIT | M_ZERO); 799 if (sp != 0) 800 error = s_write(sc->indir, u, sp); 801 else 802 error = ENOMEM; 803 if (error != 0) 804 break; 805 } 806 } 807 return (error); 808 } 809 810 811 static int 812 mdsetcred(struct md_s *sc, struct ucred *cred) 813 { 814 char *tmpbuf; 815 int error = 0; 816 817 /* 818 * Set credits in our softc 819 */ 820 821 if (sc->cred) 822 crfree(sc->cred); 823 sc->cred = crhold(cred); 824 825 /* 826 * Horrible kludge to establish credentials for NFS XXX. 827 */ 828 829 if (sc->vnode) { 830 struct uio auio; 831 struct iovec aiov; 832 833 tmpbuf = malloc(sc->sectorsize, M_TEMP, M_WAITOK); 834 bzero(&auio, sizeof(auio)); 835 836 aiov.iov_base = tmpbuf; 837 aiov.iov_len = sc->sectorsize; 838 auio.uio_iov = &aiov; 839 auio.uio_iovcnt = 1; 840 auio.uio_offset = 0; 841 auio.uio_rw = UIO_READ; 842 auio.uio_segflg = UIO_SYSSPACE; 843 auio.uio_resid = aiov.iov_len; 844 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 845 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 846 VOP_UNLOCK(sc->vnode, 0, curthread); 847 free(tmpbuf, M_TEMP); 848 } 849 return (error); 850 } 851 852 static int 853 mdcreate_vnode(struct md_s *sc, struct md_ioctl *mdio, struct thread *td) 854 { 855 struct vattr vattr; 856 struct nameidata nd; 857 int error, flags; 858 859 error = copyinstr(mdio->md_file, sc->file, sizeof(sc->file), NULL); 860 if (error != 0) 861 return (error); 862 flags = FREAD|FWRITE; 863 /* 864 * If the user specified that this is a read only device, unset the 865 * FWRITE mask before trying to open the backing store. 866 */ 867 if ((mdio->md_options & MD_READONLY) != 0) 868 flags &= ~FWRITE; 869 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, sc->file, td); 870 error = vn_open(&nd, &flags, 0, -1); 871 NDFREE(&nd, NDF_ONLY_PNBUF); 872 if (error != 0) 873 return (error); 874 if (nd.ni_vp->v_type != VREG || 875 (error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred, td))) { 876 VOP_UNLOCK(nd.ni_vp, 0, td); 877 (void)vn_close(nd.ni_vp, flags, td->td_ucred, td); 878 return (error ? error : EINVAL); 879 } 880 VOP_UNLOCK(nd.ni_vp, 0, td); 881 882 if (mdio->md_fwsectors != 0) 883 sc->fwsectors = mdio->md_fwsectors; 884 if (mdio->md_fwheads != 0) 885 sc->fwheads = mdio->md_fwheads; 886 sc->flags = mdio->md_options & (MD_FORCE | MD_ASYNC); 887 if (!(flags & FWRITE)) 888 sc->flags |= MD_READONLY; 889 sc->vnode = nd.ni_vp; 890 891 error = mdsetcred(sc, td->td_ucred); 892 if (error != 0) { 893 (void)vn_close(nd.ni_vp, flags, td->td_ucred, td); 894 return (error); 895 } 896 return (0); 897 } 898 899 static int 900 mddestroy(struct md_s *sc, struct thread *td) 901 { 902 903 904 if (sc->gp) { 905 sc->gp->softc = NULL; 906 g_topology_lock(); 907 g_wither_geom(sc->gp, ENXIO); 908 g_topology_unlock(); 909 sc->gp = NULL; 910 sc->pp = NULL; 911 } 912 sc->flags |= MD_SHUTDOWN; 913 wakeup(sc); 914 while (sc->procp != NULL) 915 tsleep(&sc->procp, PRIBIO, "mddestroy", hz / 10); 916 mtx_destroy(&sc->queue_mtx); 917 if (sc->vnode != NULL) { 918 mtx_lock(&Giant); 919 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 920 FREAD : (FREAD|FWRITE), sc->cred, td); 921 mtx_unlock(&Giant); 922 } 923 if (sc->cred != NULL) 924 crfree(sc->cred); 925 if (sc->object != NULL) 926 vm_object_deallocate(sc->object); 927 if (sc->indir) 928 destroy_indir(sc, sc->indir); 929 if (sc->uma) 930 uma_zdestroy(sc->uma); 931 932 LIST_REMOVE(sc, list); 933 free(sc, M_MD); 934 return (0); 935 } 936 937 static int 938 mdcreate_swap(struct md_s *sc, struct md_ioctl *mdio, struct thread *td) 939 { 940 vm_ooffset_t npage; 941 int error; 942 943 /* 944 * Range check. Disallow negative sizes or any size less then the 945 * size of a page. Then round to a page. 946 */ 947 if (sc->mediasize == 0 || (sc->mediasize % PAGE_SIZE) != 0) 948 return (EDOM); 949 950 /* 951 * Allocate an OBJT_SWAP object. 952 * 953 * Note the truncation. 954 */ 955 956 npage = mdio->md_mediasize / PAGE_SIZE; 957 if (mdio->md_fwsectors != 0) 958 sc->fwsectors = mdio->md_fwsectors; 959 if (mdio->md_fwheads != 0) 960 sc->fwheads = mdio->md_fwheads; 961 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * npage, 962 VM_PROT_DEFAULT, 0); 963 if (sc->object == NULL) 964 return (ENOMEM); 965 sc->flags = mdio->md_options & MD_FORCE; 966 if (mdio->md_options & MD_RESERVE) { 967 if (swap_pager_reserve(sc->object, 0, npage) < 0) { 968 vm_object_deallocate(sc->object); 969 sc->object = NULL; 970 return (EDOM); 971 } 972 } 973 error = mdsetcred(sc, td->td_ucred); 974 if (error != 0) { 975 vm_object_deallocate(sc->object); 976 sc->object = NULL; 977 } 978 return (error); 979 } 980 981 982 static int 983 xmdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 984 { 985 struct md_ioctl *mdio; 986 struct md_s *sc; 987 int error, i; 988 989 if (md_debug) 990 printf("mdctlioctl(%s %lx %p %x %p)\n", 991 devtoname(dev), cmd, addr, flags, td); 992 993 mdio = (struct md_ioctl *)addr; 994 if (mdio->md_version != MDIOVERSION) 995 return (EINVAL); 996 997 /* 998 * We assert the version number in the individual ioctl 999 * handlers instead of out here because (a) it is possible we 1000 * may add another ioctl in the future which doesn't read an 1001 * mdio, and (b) the correct return value for an unknown ioctl 1002 * is ENOIOCTL, not EINVAL. 1003 */ 1004 error = 0; 1005 switch (cmd) { 1006 case MDIOCATTACH: 1007 switch (mdio->md_type) { 1008 case MD_MALLOC: 1009 case MD_PRELOAD: 1010 case MD_VNODE: 1011 case MD_SWAP: 1012 break; 1013 default: 1014 return (EINVAL); 1015 } 1016 if (mdio->md_options & MD_AUTOUNIT) 1017 sc = mdnew(-1, &error, mdio->md_type); 1018 else 1019 sc = mdnew(mdio->md_unit, &error, mdio->md_type); 1020 if (sc == NULL) 1021 return (error); 1022 if (mdio->md_options & MD_AUTOUNIT) 1023 mdio->md_unit = sc->unit; 1024 sc->mediasize = mdio->md_mediasize; 1025 if (mdio->md_sectorsize == 0) 1026 sc->sectorsize = DEV_BSIZE; 1027 else 1028 sc->sectorsize = mdio->md_sectorsize; 1029 error = EDOOFUS; 1030 switch (sc->type) { 1031 case MD_MALLOC: 1032 sc->start = mdstart_malloc; 1033 error = mdcreate_malloc(sc, mdio); 1034 break; 1035 case MD_PRELOAD: 1036 sc->start = mdstart_preload; 1037 error = mdcreate_preload(sc, mdio); 1038 break; 1039 case MD_VNODE: 1040 sc->start = mdstart_vnode; 1041 error = mdcreate_vnode(sc, mdio, td); 1042 break; 1043 case MD_SWAP: 1044 sc->start = mdstart_swap; 1045 error = mdcreate_swap(sc, mdio, td); 1046 break; 1047 } 1048 if (error != 0) { 1049 mddestroy(sc, td); 1050 return (error); 1051 } 1052 1053 /* Prune off any residual fractional sector */ 1054 i = sc->mediasize % sc->sectorsize; 1055 sc->mediasize -= i; 1056 1057 mdinit(sc); 1058 return (0); 1059 case MDIOCDETACH: 1060 if (mdio->md_mediasize != 0 || mdio->md_options != 0) 1061 return (EINVAL); 1062 1063 sc = mdfind(mdio->md_unit); 1064 if (sc == NULL) 1065 return (ENOENT); 1066 if (sc->opencount != 0 && !(sc->flags & MD_FORCE)) 1067 return (EBUSY); 1068 return (mddestroy(sc, td)); 1069 case MDIOCQUERY: 1070 sc = mdfind(mdio->md_unit); 1071 if (sc == NULL) 1072 return (ENOENT); 1073 mdio->md_type = sc->type; 1074 mdio->md_options = sc->flags; 1075 mdio->md_mediasize = sc->mediasize; 1076 mdio->md_sectorsize = sc->sectorsize; 1077 if (sc->type == MD_VNODE) 1078 error = copyout(sc->file, mdio->md_file, 1079 strlen(sc->file) + 1); 1080 return (error); 1081 case MDIOCLIST: 1082 i = 1; 1083 LIST_FOREACH(sc, &md_softc_list, list) { 1084 if (i == MDNPAD - 1) 1085 mdio->md_pad[i] = -1; 1086 else 1087 mdio->md_pad[i++] = sc->unit; 1088 } 1089 mdio->md_pad[0] = i - 1; 1090 return (0); 1091 default: 1092 return (ENOIOCTL); 1093 }; 1094 } 1095 1096 static int 1097 mdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 1098 { 1099 int error; 1100 1101 sx_xlock(&md_sx); 1102 error = xmdctlioctl(dev, cmd, addr, flags, td); 1103 sx_xunlock(&md_sx); 1104 return (error); 1105 } 1106 1107 static void 1108 md_preloaded(u_char *image, size_t length) 1109 { 1110 struct md_s *sc; 1111 int error; 1112 1113 sc = mdnew(-1, &error, MD_PRELOAD); 1114 if (sc == NULL) 1115 return; 1116 sc->mediasize = length; 1117 sc->sectorsize = DEV_BSIZE; 1118 sc->pl_ptr = image; 1119 sc->pl_len = length; 1120 sc->start = mdstart_preload; 1121 #ifdef MD_ROOT 1122 if (sc->unit == 0) 1123 rootdevnames[0] = "ufs:/dev/md0"; 1124 #endif 1125 mdinit(sc); 1126 } 1127 1128 static void 1129 g_md_init(struct g_class *mp __unused) 1130 { 1131 1132 caddr_t mod; 1133 caddr_t c; 1134 u_char *ptr, *name, *type; 1135 unsigned len; 1136 1137 mod = NULL; 1138 sx_init(&md_sx, "MD config lock"); 1139 g_topology_unlock(); 1140 #ifdef MD_ROOT_SIZE 1141 sx_xlock(&md_sx); 1142 md_preloaded(mfs_root, MD_ROOT_SIZE * 1024); 1143 sx_xunlock(&md_sx); 1144 #endif 1145 /* XXX: are preload_* static or do they need Giant ? */ 1146 while ((mod = preload_search_next_name(mod)) != NULL) { 1147 name = (char *)preload_search_info(mod, MODINFO_NAME); 1148 if (name == NULL) 1149 continue; 1150 type = (char *)preload_search_info(mod, MODINFO_TYPE); 1151 if (type == NULL) 1152 continue; 1153 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 1154 continue; 1155 c = preload_search_info(mod, MODINFO_ADDR); 1156 ptr = *(u_char **)c; 1157 c = preload_search_info(mod, MODINFO_SIZE); 1158 len = *(size_t *)c; 1159 printf("%s%d: Preloaded image <%s> %d bytes at %p\n", 1160 MD_NAME, mdunits, name, len, ptr); 1161 sx_xlock(&md_sx); 1162 md_preloaded(ptr, len); 1163 sx_xunlock(&md_sx); 1164 } 1165 status_dev = make_dev(&mdctl_cdevsw, MAXMINOR, UID_ROOT, GID_WHEEL, 1166 0600, MDCTL_NAME); 1167 g_topology_lock(); 1168 } 1169 1170 static void 1171 g_md_fini(struct g_class *mp __unused) 1172 { 1173 1174 sx_destroy(&md_sx); 1175 if (status_dev != NULL) 1176 destroy_dev(status_dev); 1177 }
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