1 /* 2 * ---------------------------------------------------------------------------- 3 * "THE BEER-WARE LICENSE" (Revision 42): 4 * <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you 5 * can do whatever you want with this stuff. If we meet some day, and you think 6 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 7 * ---------------------------------------------------------------------------- 8 * 9 * $FreeBSD$ 10 * 11 */ 12 13 /* 14 * The following functions are based in the vn(4) driver: mdstart_swap(), 15 * mdstart_vnode(), mdcreate_swap(), mdcreate_vnode() and mddestroy(), 16 * and as such under the following copyright: 17 * 18 * Copyright (c) 1988 University of Utah. 19 * Copyright (c) 1990, 1993 20 * The Regents of the University of California. All rights reserved. 21 * 22 * This code is derived from software contributed to Berkeley by 23 * the Systems Programming Group of the University of Utah Computer 24 * Science Department. 25 * 26 * Redistribution and use in source and binary forms, with or without 27 * modification, are permitted provided that the following conditions 28 * are met: 29 * 1. Redistributions of source code must retain the above copyright 30 * notice, this list of conditions and the following disclaimer. 31 * 2. Redistributions in binary form must reproduce the above copyright 32 * notice, this list of conditions and the following disclaimer in the 33 * documentation and/or other materials provided with the distribution. 34 * 4. Neither the name of the University nor the names of its contributors 35 * may be used to endorse or promote products derived from this software 36 * without specific prior written permission. 37 * 38 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 39 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 41 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 42 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 43 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 44 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 45 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 46 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 47 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 48 * SUCH DAMAGE. 49 * 50 * from: Utah Hdr: vn.c 1.13 94/04/02 51 * 52 * from: @(#)vn.c 8.6 (Berkeley) 4/1/94 53 * From: src/sys/dev/vn/vn.c,v 1.122 2000/12/16 16:06:03 54 */ 55 56 #include "opt_geom.h" 57 #include "opt_md.h" 58 59 #include <sys/param.h> 60 #include <sys/systm.h> 61 #include <sys/bio.h> 62 #include <sys/conf.h> 63 #include <sys/fcntl.h> 64 #include <sys/kernel.h> 65 #include <sys/kthread.h> 66 #include <sys/linker.h> 67 #include <sys/lock.h> 68 #include <sys/malloc.h> 69 #include <sys/mdioctl.h> 70 #include <sys/mutex.h> 71 #include <sys/namei.h> 72 #include <sys/proc.h> 73 #include <sys/queue.h> 74 #include <sys/sf_buf.h> 75 #include <sys/sysctl.h> 76 #include <sys/vnode.h> 77 78 #include <geom/geom.h> 79 80 #include <vm/vm.h> 81 #include <vm/vm_object.h> 82 #include <vm/vm_page.h> 83 #include <vm/vm_pager.h> 84 #include <vm/swap_pager.h> 85 #include <vm/uma.h> 86 87 #define MD_MODVER 1 88 89 #define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */ 90 91 #ifndef MD_NSECT 92 #define MD_NSECT (10000 * 2) 93 #endif 94 95 static MALLOC_DEFINE(M_MD, "MD disk", "Memory Disk"); 96 static MALLOC_DEFINE(M_MDSECT, "MD sectors", "Memory Disk Sectors"); 97 98 static int md_debug; 99 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, ""); 100 101 #if defined(MD_ROOT) && defined(MD_ROOT_SIZE) 102 /* Image gets put here: */ 103 static u_char mfs_root[MD_ROOT_SIZE*1024] = "MFS Filesystem goes here"; 104 static u_char end_mfs_root[] __unused = "MFS Filesystem had better STOP here"; 105 #endif 106 107 static g_init_t g_md_init; 108 static g_fini_t g_md_fini; 109 static g_start_t g_md_start; 110 static g_access_t g_md_access; 111 112 static int mdunits; 113 static struct cdev *status_dev = 0; 114 115 static d_ioctl_t mdctlioctl; 116 117 static struct cdevsw mdctl_cdevsw = { 118 .d_version = D_VERSION, 119 .d_flags = D_NEEDGIANT, 120 .d_ioctl = mdctlioctl, 121 .d_name = MD_NAME, 122 }; 123 124 struct g_class g_md_class = { 125 .name = "MD", 126 .version = G_VERSION, 127 .init = g_md_init, 128 .fini = g_md_fini, 129 .start = g_md_start, 130 .access = g_md_access, 131 }; 132 133 DECLARE_GEOM_CLASS(g_md_class, g_md); 134 135 136 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(&md_softc_list); 137 138 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 139 #define NMASK (NINDIR-1) 140 static int nshift; 141 142 struct indir { 143 uintptr_t *array; 144 u_int total; 145 u_int used; 146 u_int shift; 147 }; 148 149 struct md_s { 150 int unit; 151 LIST_ENTRY(md_s) list; 152 struct bio_queue_head bio_queue; 153 struct mtx queue_mtx; 154 struct cdev *dev; 155 enum md_types type; 156 unsigned nsect; 157 unsigned opencount; 158 unsigned secsize; 159 unsigned fwheads; 160 unsigned fwsectors; 161 unsigned flags; 162 char name[20]; 163 struct proc *procp; 164 struct g_geom *gp; 165 struct g_provider *pp; 166 167 /* MD_MALLOC related fields */ 168 struct indir *indir; 169 uma_zone_t uma; 170 171 /* MD_PRELOAD related fields */ 172 u_char *pl_ptr; 173 unsigned pl_len; 174 175 /* MD_VNODE related fields */ 176 struct vnode *vnode; 177 struct ucred *cred; 178 179 /* MD_SWAP related fields */ 180 vm_object_t object; 181 unsigned npage; 182 }; 183 184 static int mddestroy(struct md_s *sc, struct thread *td); 185 186 static struct indir * 187 new_indir(u_int shift) 188 { 189 struct indir *ip; 190 191 ip = malloc(sizeof *ip, M_MD, M_NOWAIT | M_ZERO); 192 if (ip == NULL) 193 return (NULL); 194 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 195 M_MDSECT, M_NOWAIT | M_ZERO); 196 if (ip->array == NULL) { 197 free(ip, M_MD); 198 return (NULL); 199 } 200 ip->total = NINDIR; 201 ip->shift = shift; 202 return (ip); 203 } 204 205 static void 206 del_indir(struct indir *ip) 207 { 208 209 free(ip->array, M_MDSECT); 210 free(ip, M_MD); 211 } 212 213 static void 214 destroy_indir(struct md_s *sc, struct indir *ip) 215 { 216 int i; 217 218 for (i = 0; i < NINDIR; i++) { 219 if (!ip->array[i]) 220 continue; 221 if (ip->shift) 222 destroy_indir(sc, (struct indir*)(ip->array[i])); 223 else if (ip->array[i] > 255) 224 uma_zfree(sc->uma, (void *)(ip->array[i])); 225 } 226 del_indir(ip); 227 } 228 229 /* 230 * This function does the math and alloctes the top level "indir" structure 231 * for a device of "size" sectors. 232 */ 233 234 static struct indir * 235 dimension(off_t size) 236 { 237 off_t rcnt; 238 struct indir *ip; 239 int i, layer; 240 241 rcnt = size; 242 layer = 0; 243 while (rcnt > NINDIR) { 244 rcnt /= NINDIR; 245 layer++; 246 } 247 /* figure out log2(NINDIR) */ 248 for (i = NINDIR, nshift = -1; i; nshift++) 249 i >>= 1; 250 251 /* 252 * XXX: the top layer is probably not fully populated, so we allocate 253 * too much space for ip->array in here. 254 */ 255 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO); 256 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 257 M_MDSECT, M_WAITOK | M_ZERO); 258 ip->total = NINDIR; 259 ip->shift = layer * nshift; 260 return (ip); 261 } 262 263 /* 264 * Read a given sector 265 */ 266 267 static uintptr_t 268 s_read(struct indir *ip, off_t offset) 269 { 270 struct indir *cip; 271 int idx; 272 uintptr_t up; 273 274 if (md_debug > 1) 275 printf("s_read(%jd)\n", (intmax_t)offset); 276 up = 0; 277 for (cip = ip; cip != NULL;) { 278 if (cip->shift) { 279 idx = (offset >> cip->shift) & NMASK; 280 up = cip->array[idx]; 281 cip = (struct indir *)up; 282 continue; 283 } 284 idx = offset & NMASK; 285 return (cip->array[idx]); 286 } 287 return (0); 288 } 289 290 /* 291 * Write a given sector, prune the tree if the value is 0 292 */ 293 294 static int 295 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 296 { 297 struct indir *cip, *lip[10]; 298 int idx, li; 299 uintptr_t up; 300 301 if (md_debug > 1) 302 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 303 up = 0; 304 li = 0; 305 cip = ip; 306 for (;;) { 307 lip[li++] = cip; 308 if (cip->shift) { 309 idx = (offset >> cip->shift) & NMASK; 310 up = cip->array[idx]; 311 if (up != 0) { 312 cip = (struct indir *)up; 313 continue; 314 } 315 /* Allocate branch */ 316 cip->array[idx] = 317 (uintptr_t)new_indir(cip->shift - nshift); 318 if (cip->array[idx] == 0) 319 return (ENOSPC); 320 cip->used++; 321 up = cip->array[idx]; 322 cip = (struct indir *)up; 323 continue; 324 } 325 /* leafnode */ 326 idx = offset & NMASK; 327 up = cip->array[idx]; 328 if (up != 0) 329 cip->used--; 330 cip->array[idx] = ptr; 331 if (ptr != 0) 332 cip->used++; 333 break; 334 } 335 if (cip->used != 0 || li == 1) 336 return (0); 337 li--; 338 while (cip->used == 0 && cip != ip) { 339 li--; 340 idx = (offset >> lip[li]->shift) & NMASK; 341 up = lip[li]->array[idx]; 342 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 343 del_indir(cip); 344 lip[li]->array[idx] = 0; 345 lip[li]->used--; 346 cip = lip[li]; 347 } 348 return (0); 349 } 350 351 352 static int 353 g_md_access(struct g_provider *pp, int r, int w, int e) 354 { 355 struct md_s *sc; 356 357 sc = pp->geom->softc; 358 if (sc == NULL) 359 return (ENXIO); 360 r += pp->acr; 361 w += pp->acw; 362 e += pp->ace; 363 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 364 sc->opencount = 1; 365 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 366 sc->opencount = 0; 367 } 368 return (0); 369 } 370 371 static void 372 g_md_start(struct bio *bp) 373 { 374 struct md_s *sc; 375 376 sc = bp->bio_to->geom->softc; 377 mtx_lock(&sc->queue_mtx); 378 bioq_disksort(&sc->bio_queue, bp); 379 wakeup(sc); 380 mtx_unlock(&sc->queue_mtx); 381 } 382 383 384 385 static int 386 mdstart_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_length / sc->secsize; 394 secno = bp->bio_offset / sc->secsize; 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 } 452 453 static int 454 mdstart_preload(struct md_s *sc, struct bio *bp) 455 { 456 457 switch (bp->bio_cmd) { 458 case BIO_READ: 459 bcopy(sc->pl_ptr + bp->bio_offset, bp->bio_data, 460 bp->bio_length); 461 break; 462 case BIO_WRITE: 463 bcopy(bp->bio_data, sc->pl_ptr + bp->bio_offset, 464 bp->bio_length); 465 break; 466 } 467 bp->bio_resid = 0; 468 return (0); 469 } 470 471 static int 472 mdstart_vnode(struct md_s *sc, struct bio *bp) 473 { 474 int error; 475 struct uio auio; 476 struct iovec aiov; 477 struct mount *mp; 478 479 /* 480 * VNODE I/O 481 * 482 * If an error occurs, we set BIO_ERROR but we do not set 483 * B_INVAL because (for a write anyway), the buffer is 484 * still valid. 485 */ 486 487 bzero(&auio, sizeof(auio)); 488 489 aiov.iov_base = bp->bio_data; 490 aiov.iov_len = bp->bio_length; 491 auio.uio_iov = &aiov; 492 auio.uio_iovcnt = 1; 493 auio.uio_offset = (vm_ooffset_t)bp->bio_offset; 494 auio.uio_segflg = UIO_SYSSPACE; 495 if(bp->bio_cmd == BIO_READ) 496 auio.uio_rw = UIO_READ; 497 else if(bp->bio_cmd == BIO_WRITE) 498 auio.uio_rw = UIO_WRITE; 499 else 500 panic("wrong BIO_OP in mdstart_vnode"); 501 auio.uio_resid = bp->bio_length; 502 auio.uio_td = curthread; 503 /* 504 * When reading set IO_DIRECT to try to avoid double-caching 505 * the data. When writing IO_DIRECT is not optimal. 506 */ 507 if (bp->bio_cmd == BIO_READ) { 508 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 509 error = VOP_READ(sc->vnode, &auio, IO_DIRECT, sc->cred); 510 VOP_UNLOCK(sc->vnode, 0, curthread); 511 } else { 512 (void) vn_start_write(sc->vnode, &mp, V_WAIT); 513 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 514 error = VOP_WRITE(sc->vnode, &auio, 515 sc->flags & MD_ASYNC ? 0 : IO_SYNC, sc->cred); 516 VOP_UNLOCK(sc->vnode, 0, curthread); 517 vn_finished_write(mp); 518 } 519 bp->bio_resid = auio.uio_resid; 520 return (error); 521 } 522 523 static int 524 mdstart_swap(struct md_s *sc, struct bio *bp) 525 { 526 struct sf_buf *sf; 527 int rv, offs, len, lastend; 528 vm_pindex_t i, lastp; 529 vm_page_t m; 530 u_char *p; 531 532 p = bp->bio_data; 533 534 /* 535 * offs is the ofset at whih to start operating on the 536 * next (ie, first) page. lastp is the last page on 537 * which we're going to operate. lastend is the ending 538 * position within that last page (ie, PAGE_SIZE if 539 * we're operating on complete aligned pages). 540 */ 541 offs = bp->bio_offset % PAGE_SIZE; 542 lastp = (bp->bio_offset + bp->bio_length - 1) / PAGE_SIZE; 543 lastend = (bp->bio_offset + bp->bio_length - 1) % PAGE_SIZE + 1; 544 545 VM_OBJECT_LOCK(sc->object); 546 vm_object_pip_add(sc->object, 1); 547 for (i = bp->bio_offset / PAGE_SIZE; i <= lastp; i++) { 548 len = ((i == lastp) ? lastend : PAGE_SIZE) - offs; 549 550 m = vm_page_grab(sc->object, i, 551 VM_ALLOC_NORMAL|VM_ALLOC_RETRY); 552 VM_OBJECT_UNLOCK(sc->object); 553 sf = sf_buf_alloc(m, 0); 554 VM_OBJECT_LOCK(sc->object); 555 if (bp->bio_cmd == BIO_READ) { 556 if (m->valid != VM_PAGE_BITS_ALL) 557 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 558 bcopy((void *)(sf_buf_kva(sf) + offs), p, len); 559 } else if (bp->bio_cmd == BIO_WRITE) { 560 if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL) 561 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 562 bcopy(p, (void *)(sf_buf_kva(sf) + offs), len); 563 m->valid = VM_PAGE_BITS_ALL; 564 #if 0 565 } else if (bp->bio_cmd == BIO_DELETE) { 566 if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL) 567 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 568 bzero((void *)(sf_buf_kva(sf) + offs), len); 569 vm_page_dirty(m); 570 m->valid = VM_PAGE_BITS_ALL; 571 #endif 572 } 573 sf_buf_free(sf); 574 vm_page_lock_queues(); 575 vm_page_wakeup(m); 576 vm_page_activate(m); 577 if (bp->bio_cmd == BIO_WRITE) 578 vm_page_dirty(m); 579 vm_page_unlock_queues(); 580 581 /* Actions on further pages start at offset 0 */ 582 p += PAGE_SIZE - offs; 583 offs = 0; 584 #if 0 585 if (bootverbose || bp->bio_offset / PAGE_SIZE < 17) 586 printf("wire_count %d busy %d flags %x hold_count %d act_count %d queue %d valid %d dirty %d @ %d\n", 587 m->wire_count, m->busy, 588 m->flags, m->hold_count, m->act_count, m->queue, m->valid, m->dirty, i); 589 #endif 590 } 591 vm_object_pip_subtract(sc->object, 1); 592 vm_object_set_writeable_dirty(sc->object); 593 VM_OBJECT_UNLOCK(sc->object); 594 return (0); 595 } 596 597 static void 598 md_kthread(void *arg) 599 { 600 struct md_s *sc; 601 struct bio *bp; 602 int error, hasgiant; 603 604 sc = arg; 605 curthread->td_base_pri = PRIBIO; 606 607 switch (sc->type) { 608 case MD_VNODE: 609 mtx_lock(&Giant); 610 hasgiant = 1; 611 break; 612 case MD_MALLOC: 613 case MD_PRELOAD: 614 case MD_SWAP: 615 default: 616 hasgiant = 0; 617 break; 618 } 619 620 for (;;) { 621 mtx_lock(&sc->queue_mtx); 622 bp = bioq_takefirst(&sc->bio_queue); 623 if (!bp) { 624 if (sc->flags & MD_SHUTDOWN) { 625 mtx_unlock(&sc->queue_mtx); 626 sc->procp = NULL; 627 wakeup(&sc->procp); 628 if (hasgiant) 629 mtx_unlock(&Giant); 630 kthread_exit(0); 631 } 632 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 633 continue; 634 } 635 mtx_unlock(&sc->queue_mtx); 636 if (bp->bio_cmd == BIO_GETATTR) { 637 if (sc->fwsectors && sc->fwheads && 638 (g_handleattr_int(bp, "GEOM::fwsectors", 639 sc->fwsectors) || 640 g_handleattr_int(bp, "GEOM::fwheads", 641 sc->fwheads))) 642 error = -1; 643 else 644 error = EOPNOTSUPP; 645 } else { 646 switch (sc->type) { 647 case MD_MALLOC: 648 error = mdstart_malloc(sc, bp); 649 break; 650 case MD_PRELOAD: 651 error = mdstart_preload(sc, bp); 652 break; 653 case MD_VNODE: 654 error = mdstart_vnode(sc, bp); 655 break; 656 case MD_SWAP: 657 error = mdstart_swap(sc, bp); 658 break; 659 default: 660 panic("Impossible md(type)"); 661 break; 662 } 663 } 664 665 if (error != -1) { 666 bp->bio_completed = bp->bio_length; 667 g_io_deliver(bp, error); 668 } 669 } 670 } 671 672 static struct md_s * 673 mdfind(int unit) 674 { 675 struct md_s *sc; 676 677 /* XXX: LOCK(unique unit numbers) */ 678 LIST_FOREACH(sc, &md_softc_list, list) { 679 if (sc->unit == unit) 680 break; 681 } 682 /* XXX: UNLOCK(unique unit numbers) */ 683 return (sc); 684 } 685 686 static struct md_s * 687 mdnew(int unit) 688 { 689 struct md_s *sc; 690 int error, max = -1; 691 692 /* XXX: LOCK(unique unit numbers) */ 693 LIST_FOREACH(sc, &md_softc_list, list) { 694 if (sc->unit == unit) { 695 /* XXX: UNLOCK(unique unit numbers) */ 696 return (NULL); 697 } 698 if (sc->unit > max) 699 max = sc->unit; 700 } 701 if (unit == -1) 702 unit = max + 1; 703 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 704 sc->unit = unit; 705 bioq_init(&sc->bio_queue); 706 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 707 sprintf(sc->name, "md%d", unit); 708 error = kthread_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 709 if (error) { 710 free(sc, M_MD); 711 return (NULL); 712 } 713 LIST_INSERT_HEAD(&md_softc_list, sc, list); 714 /* XXX: UNLOCK(unique unit numbers) */ 715 return (sc); 716 } 717 718 static void 719 mdinit(struct md_s *sc) 720 { 721 722 struct g_geom *gp; 723 struct g_provider *pp; 724 725 DROP_GIANT(); 726 g_topology_lock(); 727 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 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 if (sc->type != MD_PRELOAD) 737 g_waitidle(); 738 PICKUP_GIANT(); 739 } 740 741 /* 742 * XXX: we should check that the range they feed us is mapped. 743 * XXX: we should implement read-only. 744 */ 745 746 static int 747 mdcreate_preload(struct md_ioctl *mdio) 748 { 749 struct md_s *sc; 750 751 if (mdio->md_size == 0) 752 return (EINVAL); 753 if (mdio->md_options & ~(MD_AUTOUNIT)) 754 return (EINVAL); 755 if (mdio->md_options & MD_AUTOUNIT) { 756 sc = mdnew(-1); 757 if (sc == NULL) 758 return (ENOMEM); 759 mdio->md_unit = sc->unit; 760 } else { 761 sc = mdnew(mdio->md_unit); 762 if (sc == NULL) 763 return (EBUSY); 764 } 765 sc->type = MD_PRELOAD; 766 sc->secsize = DEV_BSIZE; 767 sc->nsect = mdio->md_size; 768 sc->flags = mdio->md_options & MD_FORCE; 769 /* Cast to pointer size, then to pointer to avoid warning */ 770 sc->pl_ptr = (u_char *)(uintptr_t)mdio->md_base; 771 sc->pl_len = (mdio->md_size << DEV_BSHIFT); 772 mdinit(sc); 773 return (0); 774 } 775 776 777 static int 778 mdcreate_malloc(struct md_ioctl *mdio) 779 { 780 struct md_s *sc; 781 off_t u; 782 uintptr_t sp; 783 int error; 784 785 error = 0; 786 if (mdio->md_size == 0) 787 return (EINVAL); 788 if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 789 return (EINVAL); 790 if (mdio->md_secsize != 0 && !powerof2(mdio->md_secsize)) 791 return (EINVAL); 792 /* Compression doesn't make sense if we have reserved space */ 793 if (mdio->md_options & MD_RESERVE) 794 mdio->md_options &= ~MD_COMPRESS; 795 if (mdio->md_options & MD_AUTOUNIT) { 796 sc = mdnew(-1); 797 if (sc == NULL) 798 return (ENOMEM); 799 mdio->md_unit = sc->unit; 800 } else { 801 sc = mdnew(mdio->md_unit); 802 if (sc == NULL) 803 return (EBUSY); 804 } 805 sc->type = MD_MALLOC; 806 if (mdio->md_secsize != 0) 807 sc->secsize = mdio->md_secsize; 808 else 809 sc->secsize = DEV_BSIZE; 810 if (mdio->md_fwsectors != 0) 811 sc->fwsectors = mdio->md_fwsectors; 812 if (mdio->md_fwheads != 0) 813 sc->fwheads = mdio->md_fwheads; 814 sc->nsect = (mdio->md_size * DEV_BSIZE) / sc->secsize; 815 sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE); 816 sc->indir = dimension(sc->nsect); 817 sc->uma = uma_zcreate(sc->name, sc->secsize, 818 NULL, NULL, NULL, NULL, 0x1ff, 0); 819 if (mdio->md_options & MD_RESERVE) { 820 for (u = 0; u < sc->nsect; u++) { 821 sp = (uintptr_t) uma_zalloc(sc->uma, M_NOWAIT | M_ZERO); 822 if (sp != 0) 823 error = s_write(sc->indir, u, sp); 824 else 825 error = ENOMEM; 826 if (error) 827 break; 828 } 829 } 830 if (error) { 831 uma_zdestroy(sc->uma); 832 mddestroy(sc, NULL); 833 return (error); 834 } 835 mdinit(sc); 836 if (!(mdio->md_options & MD_RESERVE)) 837 sc->pp->flags |= G_PF_CANDELETE; 838 return (0); 839 } 840 841 842 static int 843 mdsetcred(struct md_s *sc, struct ucred *cred) 844 { 845 char *tmpbuf; 846 int error = 0; 847 848 /* 849 * Set credits in our softc 850 */ 851 852 if (sc->cred) 853 crfree(sc->cred); 854 sc->cred = crhold(cred); 855 856 /* 857 * Horrible kludge to establish credentials for NFS XXX. 858 */ 859 860 if (sc->vnode) { 861 struct uio auio; 862 struct iovec aiov; 863 864 tmpbuf = malloc(sc->secsize, M_TEMP, M_WAITOK); 865 bzero(&auio, sizeof(auio)); 866 867 aiov.iov_base = tmpbuf; 868 aiov.iov_len = sc->secsize; 869 auio.uio_iov = &aiov; 870 auio.uio_iovcnt = 1; 871 auio.uio_offset = 0; 872 auio.uio_rw = UIO_READ; 873 auio.uio_segflg = UIO_SYSSPACE; 874 auio.uio_resid = aiov.iov_len; 875 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 876 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 877 VOP_UNLOCK(sc->vnode, 0, curthread); 878 free(tmpbuf, M_TEMP); 879 } 880 return (error); 881 } 882 883 static int 884 mdcreate_vnode(struct md_ioctl *mdio, struct thread *td) 885 { 886 struct md_s *sc; 887 struct vattr vattr; 888 struct nameidata nd; 889 int error, flags; 890 891 flags = FREAD|FWRITE; 892 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 893 error = vn_open(&nd, &flags, 0, -1); 894 if (error) { 895 NDFREE(&nd, NDF_ONLY_PNBUF); 896 if (error != EACCES && error != EPERM && error != EROFS) 897 return (error); 898 flags &= ~FWRITE; 899 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, mdio->md_file, td); 900 error = vn_open(&nd, &flags, 0, -1); 901 } 902 NDFREE(&nd, NDF_ONLY_PNBUF); 903 if (error) 904 return (error); 905 if (nd.ni_vp->v_type != VREG || 906 (error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred, td))) { 907 VOP_UNLOCK(nd.ni_vp, 0, td); 908 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 909 return (error ? error : EINVAL); 910 } 911 VOP_UNLOCK(nd.ni_vp, 0, td); 912 913 if (mdio->md_options & MD_AUTOUNIT) { 914 sc = mdnew(-1); 915 mdio->md_unit = sc->unit; 916 } else { 917 sc = mdnew(mdio->md_unit); 918 } 919 if (sc == NULL) { 920 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 921 return (EBUSY); 922 } 923 924 if (mdio->md_fwsectors != 0) 925 sc->fwsectors = mdio->md_fwsectors; 926 if (mdio->md_fwheads != 0) 927 sc->fwheads = mdio->md_fwheads; 928 sc->type = MD_VNODE; 929 sc->flags = mdio->md_options & (MD_FORCE | MD_ASYNC); 930 if (!(flags & FWRITE)) 931 sc->flags |= MD_READONLY; 932 sc->secsize = DEV_BSIZE; 933 sc->vnode = nd.ni_vp; 934 935 /* 936 * If the size is specified, override the file attributes. 937 */ 938 if (mdio->md_size) 939 sc->nsect = mdio->md_size; 940 else 941 sc->nsect = vattr.va_size / sc->secsize; /* XXX: round up ? */ 942 if (sc->nsect == 0) { 943 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 944 mddestroy(sc, td); 945 return (EINVAL); 946 } 947 error = mdsetcred(sc, td->td_ucred); 948 if (error) { 949 (void) vn_close(nd.ni_vp, flags, td->td_ucred, td); 950 mddestroy(sc, td); 951 return (error); 952 } 953 mdinit(sc); 954 return (0); 955 } 956 957 static void 958 md_zapit(void *p, int cancel) 959 { 960 if (cancel) 961 return; 962 g_wither_geom(p, ENXIO); 963 } 964 965 static int 966 mddestroy(struct md_s *sc, struct thread *td) 967 { 968 969 GIANT_REQUIRED; 970 971 mtx_destroy(&sc->queue_mtx); 972 if (sc->gp) { 973 sc->gp->softc = NULL; 974 g_waitfor_event(md_zapit, sc->gp, M_WAITOK, sc->gp, NULL); 975 sc->gp = NULL; 976 sc->pp = NULL; 977 } 978 sc->flags |= MD_SHUTDOWN; 979 wakeup(sc); 980 while (sc->procp != NULL) 981 tsleep(&sc->procp, PRIBIO, "mddestroy", hz / 10); 982 if (sc->vnode != NULL) 983 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 984 FREAD : (FREAD|FWRITE), sc->cred, td); 985 if (sc->cred != NULL) 986 crfree(sc->cred); 987 if (sc->object != NULL) { 988 vm_object_deallocate(sc->object); 989 } 990 if (sc->indir) 991 destroy_indir(sc, sc->indir); 992 if (sc->uma) 993 uma_zdestroy(sc->uma); 994 995 /* XXX: LOCK(unique unit numbers) */ 996 LIST_REMOVE(sc, list); 997 /* XXX: UNLOCK(unique unit numbers) */ 998 free(sc, M_MD); 999 return (0); 1000 } 1001 1002 static int 1003 mdcreate_swap(struct md_ioctl *mdio, struct thread *td) 1004 { 1005 int error; 1006 struct md_s *sc; 1007 1008 GIANT_REQUIRED; 1009 1010 if (mdio->md_options & MD_AUTOUNIT) { 1011 sc = mdnew(-1); 1012 mdio->md_unit = sc->unit; 1013 } else { 1014 sc = mdnew(mdio->md_unit); 1015 } 1016 if (sc == NULL) 1017 return (EBUSY); 1018 1019 sc->type = MD_SWAP; 1020 1021 /* 1022 * Range check. Disallow negative sizes or any size less then the 1023 * size of a page. Then round to a page. 1024 */ 1025 1026 if (mdio->md_size == 0) { 1027 mddestroy(sc, td); 1028 return (EDOM); 1029 } 1030 1031 /* 1032 * Allocate an OBJT_SWAP object. 1033 * 1034 * sc_nsect is in units of DEV_BSIZE. 1035 * sc_npage is in units of PAGE_SIZE. 1036 * 1037 * Note the truncation. 1038 */ 1039 1040 sc->secsize = DEV_BSIZE; 1041 sc->npage = mdio->md_size / (PAGE_SIZE / DEV_BSIZE); 1042 sc->nsect = sc->npage * (PAGE_SIZE / DEV_BSIZE); 1043 if (mdio->md_fwsectors != 0) 1044 sc->fwsectors = mdio->md_fwsectors; 1045 if (mdio->md_fwheads != 0) 1046 sc->fwheads = mdio->md_fwheads; 1047 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * 1048 (vm_offset_t)sc->npage, VM_PROT_DEFAULT, 0); 1049 sc->flags = mdio->md_options & MD_FORCE; 1050 if (mdio->md_options & MD_RESERVE) { 1051 if (swap_pager_reserve(sc->object, 0, sc->npage) < 0) { 1052 vm_object_deallocate(sc->object); 1053 sc->object = NULL; 1054 mddestroy(sc, td); 1055 return (EDOM); 1056 } 1057 } 1058 error = mdsetcred(sc, td->td_ucred); 1059 if (error) { 1060 vm_object_deallocate(sc->object); 1061 sc->object = NULL; 1062 mddestroy(sc, td); 1063 return (error); 1064 } 1065 mdinit(sc); 1066 if (!(mdio->md_options & MD_RESERVE)) 1067 sc->pp->flags |= G_PF_CANDELETE; 1068 return (0); 1069 } 1070 1071 static int 1072 mddetach(int unit, struct thread *td) 1073 { 1074 struct md_s *sc; 1075 1076 sc = mdfind(unit); 1077 if (sc == NULL) 1078 return (ENOENT); 1079 if (sc->opencount != 0 && !(sc->flags & MD_FORCE)) 1080 return (EBUSY); 1081 switch(sc->type) { 1082 case MD_VNODE: 1083 case MD_SWAP: 1084 case MD_MALLOC: 1085 case MD_PRELOAD: 1086 return (mddestroy(sc, td)); 1087 default: 1088 return (EOPNOTSUPP); 1089 } 1090 } 1091 1092 static int 1093 mdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 1094 { 1095 struct md_ioctl *mdio; 1096 struct md_s *sc; 1097 int i; 1098 1099 if (md_debug) 1100 printf("mdctlioctl(%s %lx %p %x %p)\n", 1101 devtoname(dev), cmd, addr, flags, td); 1102 1103 /* 1104 * We assert the version number in the individual ioctl 1105 * handlers instead of out here because (a) it is possible we 1106 * may add another ioctl in the future which doesn't read an 1107 * mdio, and (b) the correct return value for an unknown ioctl 1108 * is ENOIOCTL, not EINVAL. 1109 */ 1110 mdio = (struct md_ioctl *)addr; 1111 switch (cmd) { 1112 case MDIOCATTACH: 1113 if (mdio->md_version != MDIOVERSION) 1114 return (EINVAL); 1115 switch (mdio->md_type) { 1116 case MD_MALLOC: 1117 return (mdcreate_malloc(mdio)); 1118 case MD_PRELOAD: 1119 return (mdcreate_preload(mdio)); 1120 case MD_VNODE: 1121 return (mdcreate_vnode(mdio, td)); 1122 case MD_SWAP: 1123 return (mdcreate_swap(mdio, td)); 1124 default: 1125 return (EINVAL); 1126 } 1127 case MDIOCDETACH: 1128 if (mdio->md_version != MDIOVERSION) 1129 return (EINVAL); 1130 if (mdio->md_file != NULL || mdio->md_size != 0 || 1131 mdio->md_options != 0) 1132 return (EINVAL); 1133 return (mddetach(mdio->md_unit, td)); 1134 case MDIOCQUERY: 1135 if (mdio->md_version != MDIOVERSION) 1136 return (EINVAL); 1137 sc = mdfind(mdio->md_unit); 1138 if (sc == NULL) 1139 return (ENOENT); 1140 mdio->md_type = sc->type; 1141 mdio->md_options = sc->flags; 1142 switch (sc->type) { 1143 case MD_MALLOC: 1144 mdio->md_size = sc->nsect; 1145 break; 1146 case MD_PRELOAD: 1147 mdio->md_size = sc->nsect; 1148 mdio->md_base = (uint64_t)(intptr_t)sc->pl_ptr; 1149 break; 1150 case MD_SWAP: 1151 mdio->md_size = sc->nsect; 1152 break; 1153 case MD_VNODE: 1154 mdio->md_size = sc->nsect; 1155 /* XXX fill this in */ 1156 mdio->md_file = NULL; 1157 break; 1158 } 1159 return (0); 1160 case MDIOCLIST: 1161 i = 1; 1162 LIST_FOREACH(sc, &md_softc_list, list) { 1163 if (i == MDNPAD - 1) 1164 mdio->md_pad[i] = -1; 1165 else 1166 mdio->md_pad[i++] = sc->unit; 1167 } 1168 mdio->md_pad[0] = i - 1; 1169 return (0); 1170 default: 1171 return (ENOIOCTL); 1172 }; 1173 return (ENOIOCTL); 1174 } 1175 1176 static void 1177 md_preloaded(u_char *image, unsigned length) 1178 { 1179 struct md_s *sc; 1180 1181 sc = mdnew(-1); 1182 if (sc == NULL) 1183 return; 1184 sc->type = MD_PRELOAD; 1185 sc->secsize = DEV_BSIZE; 1186 sc->nsect = length / DEV_BSIZE; 1187 sc->pl_ptr = image; 1188 sc->pl_len = length; 1189 #ifdef MD_ROOT 1190 if (sc->unit == 0) 1191 rootdevnames[0] = "ufs:/dev/md0"; 1192 #endif 1193 mdinit(sc); 1194 } 1195 1196 static void 1197 g_md_init(struct g_class *mp __unused) 1198 { 1199 1200 caddr_t mod; 1201 caddr_t c; 1202 u_char *ptr, *name, *type; 1203 unsigned len; 1204 1205 mod = NULL; 1206 g_topology_unlock(); 1207 #ifdef MD_ROOT_SIZE 1208 md_preloaded(mfs_root, MD_ROOT_SIZE*1024); 1209 #endif 1210 while ((mod = preload_search_next_name(mod)) != NULL) { 1211 name = (char *)preload_search_info(mod, MODINFO_NAME); 1212 type = (char *)preload_search_info(mod, MODINFO_TYPE); 1213 if (name == NULL) 1214 continue; 1215 if (type == NULL) 1216 continue; 1217 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 1218 continue; 1219 c = preload_search_info(mod, MODINFO_ADDR); 1220 ptr = *(u_char **)c; 1221 c = preload_search_info(mod, MODINFO_SIZE); 1222 len = *(size_t *)c; 1223 printf("%s%d: Preloaded image <%s> %d bytes at %p\n", 1224 MD_NAME, mdunits, name, len, ptr); 1225 md_preloaded(ptr, len); 1226 } 1227 status_dev = make_dev(&mdctl_cdevsw, 0xffff00ff, UID_ROOT, GID_WHEEL, 1228 0600, MDCTL_NAME); 1229 g_topology_lock(); 1230 } 1231 1232 static void 1233 g_md_fini(struct g_class *mp __unused) 1234 { 1235 1236 if (status_dev != NULL) 1237 destroy_dev(status_dev); 1238 } 1239