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 * Copyright (c) 2013 The FreeBSD Foundation 22 * All rights reserved. 23 * 24 * This code is derived from software contributed to Berkeley by 25 * the Systems Programming Group of the University of Utah Computer 26 * Science Department. 27 * 28 * Portions of this software were developed by Konstantin Belousov 29 * under sponsorship from the FreeBSD Foundation. 30 * 31 * Redistribution and use in source and binary forms, with or without 32 * modification, are permitted provided that the following conditions 33 * are met: 34 * 1. Redistributions of source code must retain the above copyright 35 * notice, this list of conditions and the following disclaimer. 36 * 2. Redistributions in binary form must reproduce the above copyright 37 * notice, this list of conditions and the following disclaimer in the 38 * documentation and/or other materials provided with the distribution. 39 * 4. Neither the name of the University nor the names of its contributors 40 * may be used to endorse or promote products derived from this software 41 * without specific prior written permission. 42 * 43 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 44 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 46 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 49 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 51 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 52 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 53 * SUCH DAMAGE. 54 * 55 * from: Utah Hdr: vn.c 1.13 94/04/02 56 * 57 * from: @(#)vn.c 8.6 (Berkeley) 4/1/94 58 * From: src/sys/dev/vn/vn.c,v 1.122 2000/12/16 16:06:03 59 */ 60 61 #include "opt_geom.h" 62 #include "opt_md.h" 63 64 #include <sys/param.h> 65 #include <sys/systm.h> 66 #include <sys/bio.h> 67 #include <sys/buf.h> 68 #include <sys/conf.h> 69 #include <sys/devicestat.h> 70 #include <sys/fcntl.h> 71 #include <sys/kernel.h> 72 #include <sys/kthread.h> 73 #include <sys/limits.h> 74 #include <sys/linker.h> 75 #include <sys/lock.h> 76 #include <sys/malloc.h> 77 #include <sys/mdioctl.h> 78 #include <sys/mount.h> 79 #include <sys/mutex.h> 80 #include <sys/sx.h> 81 #include <sys/namei.h> 82 #include <sys/proc.h> 83 #include <sys/queue.h> 84 #include <sys/rwlock.h> 85 #include <sys/sbuf.h> 86 #include <sys/sched.h> 87 #include <sys/sf_buf.h> 88 #include <sys/sysctl.h> 89 #include <sys/vnode.h> 90 91 #include <geom/geom.h> 92 93 #include <vm/vm.h> 94 #include <vm/vm_param.h> 95 #include <vm/vm_object.h> 96 #include <vm/vm_page.h> 97 #include <vm/vm_pager.h> 98 #include <vm/swap_pager.h> 99 #include <vm/uma.h> 100 101 #define MD_MODVER 1 102 103 #define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */ 104 #define MD_EXITING 0x20000 /* Worker thread is exiting. */ 105 106 #ifndef MD_NSECT 107 #define MD_NSECT (10000 * 2) 108 #endif 109 110 static MALLOC_DEFINE(M_MD, "md_disk", "Memory Disk"); 111 static MALLOC_DEFINE(M_MDSECT, "md_sectors", "Memory Disk Sectors"); 112 113 static int md_debug; 114 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, 115 "Enable md(4) debug messages"); 116 static int md_malloc_wait; 117 SYSCTL_INT(_vm, OID_AUTO, md_malloc_wait, CTLFLAG_RW, &md_malloc_wait, 0, 118 "Allow malloc to wait for memory allocations"); 119 120 #if defined(MD_ROOT) && !defined(MD_ROOT_FSTYPE) 121 #define MD_ROOT_FSTYPE "ufs" 122 #endif 123 124 #if defined(MD_ROOT) && defined(MD_ROOT_SIZE) 125 /* 126 * Preloaded image gets put here. 127 * Applications that patch the object with the image can determine 128 * the size looking at the start and end markers (strings), 129 * so we want them contiguous. 130 */ 131 static struct { 132 u_char start[MD_ROOT_SIZE*1024]; 133 u_char end[128]; 134 } mfs_root = { 135 .start = "MFS Filesystem goes here", 136 .end = "MFS Filesystem had better STOP here", 137 }; 138 #endif 139 140 static g_init_t g_md_init; 141 static g_fini_t g_md_fini; 142 static g_start_t g_md_start; 143 static g_access_t g_md_access; 144 static void g_md_dumpconf(struct sbuf *sb, const char *indent, 145 struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp); 146 147 static struct cdev *status_dev = 0; 148 static struct sx md_sx; 149 static struct unrhdr *md_uh; 150 151 static d_ioctl_t mdctlioctl; 152 153 static struct cdevsw mdctl_cdevsw = { 154 .d_version = D_VERSION, 155 .d_ioctl = mdctlioctl, 156 .d_name = MD_NAME, 157 }; 158 159 struct g_class g_md_class = { 160 .name = "MD", 161 .version = G_VERSION, 162 .init = g_md_init, 163 .fini = g_md_fini, 164 .start = g_md_start, 165 .access = g_md_access, 166 .dumpconf = g_md_dumpconf, 167 }; 168 169 DECLARE_GEOM_CLASS(g_md_class, g_md); 170 171 172 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(md_softc_list); 173 174 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 175 #define NMASK (NINDIR-1) 176 static int nshift; 177 178 static int md_vnode_pbuf_freecnt; 179 180 struct indir { 181 uintptr_t *array; 182 u_int total; 183 u_int used; 184 u_int shift; 185 }; 186 187 struct md_s { 188 int unit; 189 LIST_ENTRY(md_s) list; 190 struct bio_queue_head bio_queue; 191 struct mtx queue_mtx; 192 struct mtx stat_mtx; 193 struct cdev *dev; 194 enum md_types type; 195 off_t mediasize; 196 unsigned sectorsize; 197 unsigned opencount; 198 unsigned fwheads; 199 unsigned fwsectors; 200 unsigned flags; 201 char name[20]; 202 struct proc *procp; 203 struct g_geom *gp; 204 struct g_provider *pp; 205 int (*start)(struct md_s *sc, struct bio *bp); 206 struct devstat *devstat; 207 208 /* MD_MALLOC related fields */ 209 struct indir *indir; 210 uma_zone_t uma; 211 212 /* MD_PRELOAD related fields */ 213 u_char *pl_ptr; 214 size_t pl_len; 215 216 /* MD_VNODE related fields */ 217 struct vnode *vnode; 218 char file[PATH_MAX]; 219 struct ucred *cred; 220 221 /* MD_SWAP related fields */ 222 vm_object_t object; 223 }; 224 225 static struct indir * 226 new_indir(u_int shift) 227 { 228 struct indir *ip; 229 230 ip = malloc(sizeof *ip, M_MD, (md_malloc_wait ? M_WAITOK : M_NOWAIT) 231 | M_ZERO); 232 if (ip == NULL) 233 return (NULL); 234 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 235 M_MDSECT, (md_malloc_wait ? M_WAITOK : M_NOWAIT) | M_ZERO); 236 if (ip->array == NULL) { 237 free(ip, M_MD); 238 return (NULL); 239 } 240 ip->total = NINDIR; 241 ip->shift = shift; 242 return (ip); 243 } 244 245 static void 246 del_indir(struct indir *ip) 247 { 248 249 free(ip->array, M_MDSECT); 250 free(ip, M_MD); 251 } 252 253 static void 254 destroy_indir(struct md_s *sc, struct indir *ip) 255 { 256 int i; 257 258 for (i = 0; i < NINDIR; i++) { 259 if (!ip->array[i]) 260 continue; 261 if (ip->shift) 262 destroy_indir(sc, (struct indir*)(ip->array[i])); 263 else if (ip->array[i] > 255) 264 uma_zfree(sc->uma, (void *)(ip->array[i])); 265 } 266 del_indir(ip); 267 } 268 269 /* 270 * This function does the math and allocates the top level "indir" structure 271 * for a device of "size" sectors. 272 */ 273 274 static struct indir * 275 dimension(off_t size) 276 { 277 off_t rcnt; 278 struct indir *ip; 279 int layer; 280 281 rcnt = size; 282 layer = 0; 283 while (rcnt > NINDIR) { 284 rcnt /= NINDIR; 285 layer++; 286 } 287 288 /* 289 * XXX: the top layer is probably not fully populated, so we allocate 290 * too much space for ip->array in here. 291 */ 292 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO); 293 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 294 M_MDSECT, M_WAITOK | M_ZERO); 295 ip->total = NINDIR; 296 ip->shift = layer * nshift; 297 return (ip); 298 } 299 300 /* 301 * Read a given sector 302 */ 303 304 static uintptr_t 305 s_read(struct indir *ip, off_t offset) 306 { 307 struct indir *cip; 308 int idx; 309 uintptr_t up; 310 311 if (md_debug > 1) 312 printf("s_read(%jd)\n", (intmax_t)offset); 313 up = 0; 314 for (cip = ip; cip != NULL;) { 315 if (cip->shift) { 316 idx = (offset >> cip->shift) & NMASK; 317 up = cip->array[idx]; 318 cip = (struct indir *)up; 319 continue; 320 } 321 idx = offset & NMASK; 322 return (cip->array[idx]); 323 } 324 return (0); 325 } 326 327 /* 328 * Write a given sector, prune the tree if the value is 0 329 */ 330 331 static int 332 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 333 { 334 struct indir *cip, *lip[10]; 335 int idx, li; 336 uintptr_t up; 337 338 if (md_debug > 1) 339 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 340 up = 0; 341 li = 0; 342 cip = ip; 343 for (;;) { 344 lip[li++] = cip; 345 if (cip->shift) { 346 idx = (offset >> cip->shift) & NMASK; 347 up = cip->array[idx]; 348 if (up != 0) { 349 cip = (struct indir *)up; 350 continue; 351 } 352 /* Allocate branch */ 353 cip->array[idx] = 354 (uintptr_t)new_indir(cip->shift - nshift); 355 if (cip->array[idx] == 0) 356 return (ENOSPC); 357 cip->used++; 358 up = cip->array[idx]; 359 cip = (struct indir *)up; 360 continue; 361 } 362 /* leafnode */ 363 idx = offset & NMASK; 364 up = cip->array[idx]; 365 if (up != 0) 366 cip->used--; 367 cip->array[idx] = ptr; 368 if (ptr != 0) 369 cip->used++; 370 break; 371 } 372 if (cip->used != 0 || li == 1) 373 return (0); 374 li--; 375 while (cip->used == 0 && cip != ip) { 376 li--; 377 idx = (offset >> lip[li]->shift) & NMASK; 378 up = lip[li]->array[idx]; 379 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 380 del_indir(cip); 381 lip[li]->array[idx] = 0; 382 lip[li]->used--; 383 cip = lip[li]; 384 } 385 return (0); 386 } 387 388 389 static int 390 g_md_access(struct g_provider *pp, int r, int w, int e) 391 { 392 struct md_s *sc; 393 394 sc = pp->geom->softc; 395 if (sc == NULL) { 396 if (r <= 0 && w <= 0 && e <= 0) 397 return (0); 398 return (ENXIO); 399 } 400 r += pp->acr; 401 w += pp->acw; 402 e += pp->ace; 403 if ((sc->flags & MD_READONLY) != 0 && w > 0) 404 return (EROFS); 405 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 406 sc->opencount = 1; 407 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 408 sc->opencount = 0; 409 } 410 return (0); 411 } 412 413 static void 414 g_md_start(struct bio *bp) 415 { 416 struct md_s *sc; 417 418 sc = bp->bio_to->geom->softc; 419 if ((bp->bio_cmd == BIO_READ) || (bp->bio_cmd == BIO_WRITE)) { 420 mtx_lock(&sc->stat_mtx); 421 devstat_start_transaction_bio(sc->devstat, bp); 422 mtx_unlock(&sc->stat_mtx); 423 } 424 mtx_lock(&sc->queue_mtx); 425 bioq_disksort(&sc->bio_queue, bp); 426 mtx_unlock(&sc->queue_mtx); 427 wakeup(sc); 428 } 429 430 #define MD_MALLOC_MOVE_ZERO 1 431 #define MD_MALLOC_MOVE_FILL 2 432 #define MD_MALLOC_MOVE_READ 3 433 #define MD_MALLOC_MOVE_WRITE 4 434 #define MD_MALLOC_MOVE_CMP 5 435 436 static int 437 md_malloc_move(vm_page_t **mp, int *ma_offs, unsigned sectorsize, 438 void *ptr, u_char fill, int op) 439 { 440 struct sf_buf *sf; 441 vm_page_t m, *mp1; 442 char *p, first; 443 off_t *uc; 444 unsigned n; 445 int error, i, ma_offs1, sz, first_read; 446 447 m = NULL; 448 error = 0; 449 sf = NULL; 450 /* if (op == MD_MALLOC_MOVE_CMP) { gcc */ 451 first = 0; 452 first_read = 0; 453 uc = ptr; 454 mp1 = *mp; 455 ma_offs1 = *ma_offs; 456 /* } */ 457 sched_pin(); 458 for (n = sectorsize; n != 0; n -= sz) { 459 sz = imin(PAGE_SIZE - *ma_offs, n); 460 if (m != **mp) { 461 if (sf != NULL) 462 sf_buf_free(sf); 463 m = **mp; 464 sf = sf_buf_alloc(m, SFB_CPUPRIVATE | 465 (md_malloc_wait ? 0 : SFB_NOWAIT)); 466 if (sf == NULL) { 467 error = ENOMEM; 468 break; 469 } 470 } 471 p = (char *)sf_buf_kva(sf) + *ma_offs; 472 switch (op) { 473 case MD_MALLOC_MOVE_ZERO: 474 bzero(p, sz); 475 break; 476 case MD_MALLOC_MOVE_FILL: 477 memset(p, fill, sz); 478 break; 479 case MD_MALLOC_MOVE_READ: 480 bcopy(ptr, p, sz); 481 cpu_flush_dcache(p, sz); 482 break; 483 case MD_MALLOC_MOVE_WRITE: 484 bcopy(p, ptr, sz); 485 break; 486 case MD_MALLOC_MOVE_CMP: 487 for (i = 0; i < sz; i++, p++) { 488 if (!first_read) { 489 *uc = (u_char)*p; 490 first = *p; 491 first_read = 1; 492 } else if (*p != first) { 493 error = EDOOFUS; 494 break; 495 } 496 } 497 break; 498 default: 499 KASSERT(0, ("md_malloc_move unknown op %d\n", op)); 500 break; 501 } 502 if (error != 0) 503 break; 504 *ma_offs += sz; 505 *ma_offs %= PAGE_SIZE; 506 if (*ma_offs == 0) 507 (*mp)++; 508 ptr = (char *)ptr + sz; 509 } 510 511 if (sf != NULL) 512 sf_buf_free(sf); 513 sched_unpin(); 514 if (op == MD_MALLOC_MOVE_CMP && error != 0) { 515 *mp = mp1; 516 *ma_offs = ma_offs1; 517 } 518 return (error); 519 } 520 521 static int 522 mdstart_malloc(struct md_s *sc, struct bio *bp) 523 { 524 u_char *dst; 525 vm_page_t *m; 526 int i, error, error1, ma_offs, notmapped; 527 off_t secno, nsec, uc; 528 uintptr_t sp, osp; 529 530 switch (bp->bio_cmd) { 531 case BIO_READ: 532 case BIO_WRITE: 533 case BIO_DELETE: 534 break; 535 default: 536 return (EOPNOTSUPP); 537 } 538 539 notmapped = (bp->bio_flags & BIO_UNMAPPED) != 0; 540 if (notmapped) { 541 m = bp->bio_ma; 542 ma_offs = bp->bio_ma_offset; 543 dst = NULL; 544 } else { 545 dst = bp->bio_data; 546 } 547 548 nsec = bp->bio_length / sc->sectorsize; 549 secno = bp->bio_offset / sc->sectorsize; 550 error = 0; 551 while (nsec--) { 552 osp = s_read(sc->indir, secno); 553 if (bp->bio_cmd == BIO_DELETE) { 554 if (osp != 0) 555 error = s_write(sc->indir, secno, 0); 556 } else if (bp->bio_cmd == BIO_READ) { 557 if (osp == 0) { 558 if (notmapped) { 559 error = md_malloc_move(&m, &ma_offs, 560 sc->sectorsize, NULL, 0, 561 MD_MALLOC_MOVE_ZERO); 562 } else 563 bzero(dst, sc->sectorsize); 564 } else if (osp <= 255) { 565 if (notmapped) { 566 error = md_malloc_move(&m, &ma_offs, 567 sc->sectorsize, NULL, osp, 568 MD_MALLOC_MOVE_FILL); 569 } else 570 memset(dst, osp, sc->sectorsize); 571 } else { 572 if (notmapped) { 573 error = md_malloc_move(&m, &ma_offs, 574 sc->sectorsize, (void *)osp, 0, 575 MD_MALLOC_MOVE_READ); 576 } else { 577 bcopy((void *)osp, dst, sc->sectorsize); 578 cpu_flush_dcache(dst, sc->sectorsize); 579 } 580 } 581 osp = 0; 582 } else if (bp->bio_cmd == BIO_WRITE) { 583 if (sc->flags & MD_COMPRESS) { 584 if (notmapped) { 585 error1 = md_malloc_move(&m, &ma_offs, 586 sc->sectorsize, &uc, 0, 587 MD_MALLOC_MOVE_CMP); 588 i = error1 == 0 ? sc->sectorsize : 0; 589 } else { 590 uc = dst[0]; 591 for (i = 1; i < sc->sectorsize; i++) { 592 if (dst[i] != uc) 593 break; 594 } 595 } 596 } else { 597 i = 0; 598 uc = 0; 599 } 600 if (i == sc->sectorsize) { 601 if (osp != uc) 602 error = s_write(sc->indir, secno, uc); 603 } else { 604 if (osp <= 255) { 605 sp = (uintptr_t)uma_zalloc(sc->uma, 606 md_malloc_wait ? M_WAITOK : 607 M_NOWAIT); 608 if (sp == 0) { 609 error = ENOSPC; 610 break; 611 } 612 if (notmapped) { 613 error = md_malloc_move(&m, 614 &ma_offs, sc->sectorsize, 615 (void *)sp, 0, 616 MD_MALLOC_MOVE_WRITE); 617 } else { 618 bcopy(dst, (void *)sp, 619 sc->sectorsize); 620 } 621 error = s_write(sc->indir, secno, sp); 622 } else { 623 if (notmapped) { 624 error = md_malloc_move(&m, 625 &ma_offs, sc->sectorsize, 626 (void *)osp, 0, 627 MD_MALLOC_MOVE_WRITE); 628 } else { 629 bcopy(dst, (void *)osp, 630 sc->sectorsize); 631 } 632 osp = 0; 633 } 634 } 635 } else { 636 error = EOPNOTSUPP; 637 } 638 if (osp > 255) 639 uma_zfree(sc->uma, (void*)osp); 640 if (error != 0) 641 break; 642 secno++; 643 if (!notmapped) 644 dst += sc->sectorsize; 645 } 646 bp->bio_resid = 0; 647 return (error); 648 } 649 650 static int 651 mdstart_preload(struct md_s *sc, struct bio *bp) 652 { 653 654 switch (bp->bio_cmd) { 655 case BIO_READ: 656 bcopy(sc->pl_ptr + bp->bio_offset, bp->bio_data, 657 bp->bio_length); 658 cpu_flush_dcache(bp->bio_data, bp->bio_length); 659 break; 660 case BIO_WRITE: 661 bcopy(bp->bio_data, sc->pl_ptr + bp->bio_offset, 662 bp->bio_length); 663 break; 664 } 665 bp->bio_resid = 0; 666 return (0); 667 } 668 669 static int 670 mdstart_vnode(struct md_s *sc, struct bio *bp) 671 { 672 int error; 673 struct uio auio; 674 struct iovec aiov; 675 struct mount *mp; 676 struct vnode *vp; 677 struct buf *pb; 678 struct thread *td; 679 off_t end, zerosize; 680 681 switch (bp->bio_cmd) { 682 case BIO_READ: 683 case BIO_WRITE: 684 case BIO_DELETE: 685 case BIO_FLUSH: 686 break; 687 default: 688 return (EOPNOTSUPP); 689 } 690 691 td = curthread; 692 vp = sc->vnode; 693 694 /* 695 * VNODE I/O 696 * 697 * If an error occurs, we set BIO_ERROR but we do not set 698 * B_INVAL because (for a write anyway), the buffer is 699 * still valid. 700 */ 701 702 if (bp->bio_cmd == BIO_FLUSH) { 703 (void) vn_start_write(vp, &mp, V_WAIT); 704 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 705 error = VOP_FSYNC(vp, MNT_WAIT, td); 706 VOP_UNLOCK(vp, 0); 707 vn_finished_write(mp); 708 return (error); 709 } 710 711 bzero(&auio, sizeof(auio)); 712 713 /* 714 * Special case for BIO_DELETE. On the surface, this is very 715 * similar to BIO_WRITE, except that we write from our own 716 * fixed-length buffer, so we have to loop. The net result is 717 * that the two cases end up having very little in common. 718 */ 719 if (bp->bio_cmd == BIO_DELETE) { 720 zerosize = ZERO_REGION_SIZE - 721 (ZERO_REGION_SIZE % sc->sectorsize); 722 auio.uio_iov = &aiov; 723 auio.uio_iovcnt = 1; 724 auio.uio_offset = (vm_ooffset_t)bp->bio_offset; 725 auio.uio_segflg = UIO_SYSSPACE; 726 auio.uio_rw = UIO_WRITE; 727 auio.uio_td = td; 728 end = bp->bio_offset + bp->bio_length; 729 (void) vn_start_write(vp, &mp, V_WAIT); 730 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 731 error = 0; 732 while (auio.uio_offset < end) { 733 aiov.iov_base = __DECONST(void *, zero_region); 734 aiov.iov_len = end - auio.uio_offset; 735 if (aiov.iov_len > zerosize) 736 aiov.iov_len = zerosize; 737 auio.uio_resid = aiov.iov_len; 738 error = VOP_WRITE(vp, &auio, 739 sc->flags & MD_ASYNC ? 0 : IO_SYNC, sc->cred); 740 if (error != 0) 741 break; 742 } 743 VOP_UNLOCK(vp, 0); 744 vn_finished_write(mp); 745 bp->bio_resid = end - auio.uio_offset; 746 return (error); 747 } 748 749 if ((bp->bio_flags & BIO_UNMAPPED) == 0) { 750 pb = NULL; 751 aiov.iov_base = bp->bio_data; 752 } else { 753 KASSERT(bp->bio_length <= MAXPHYS, ("bio_length %jd", 754 (uintmax_t)bp->bio_length)); 755 pb = getpbuf(&md_vnode_pbuf_freecnt); 756 pmap_qenter((vm_offset_t)pb->b_data, bp->bio_ma, bp->bio_ma_n); 757 aiov.iov_base = (void *)((vm_offset_t)pb->b_data + 758 bp->bio_ma_offset); 759 } 760 aiov.iov_len = bp->bio_length; 761 auio.uio_iov = &aiov; 762 auio.uio_iovcnt = 1; 763 auio.uio_offset = (vm_ooffset_t)bp->bio_offset; 764 auio.uio_segflg = UIO_SYSSPACE; 765 if (bp->bio_cmd == BIO_READ) 766 auio.uio_rw = UIO_READ; 767 else if (bp->bio_cmd == BIO_WRITE) 768 auio.uio_rw = UIO_WRITE; 769 else 770 panic("wrong BIO_OP in mdstart_vnode"); 771 auio.uio_resid = bp->bio_length; 772 auio.uio_td = td; 773 /* 774 * When reading set IO_DIRECT to try to avoid double-caching 775 * the data. When writing IO_DIRECT is not optimal. 776 */ 777 if (bp->bio_cmd == BIO_READ) { 778 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 779 error = VOP_READ(vp, &auio, IO_DIRECT, sc->cred); 780 VOP_UNLOCK(vp, 0); 781 } else { 782 (void) vn_start_write(vp, &mp, V_WAIT); 783 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 784 error = VOP_WRITE(vp, &auio, sc->flags & MD_ASYNC ? 0 : IO_SYNC, 785 sc->cred); 786 VOP_UNLOCK(vp, 0); 787 vn_finished_write(mp); 788 } 789 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 790 pmap_qremove((vm_offset_t)pb->b_data, bp->bio_ma_n); 791 relpbuf(pb, &md_vnode_pbuf_freecnt); 792 } 793 bp->bio_resid = auio.uio_resid; 794 return (error); 795 } 796 797 static int 798 mdstart_swap(struct md_s *sc, struct bio *bp) 799 { 800 vm_page_t m; 801 u_char *p; 802 vm_pindex_t i, lastp; 803 int rv, ma_offs, offs, len, lastend; 804 805 switch (bp->bio_cmd) { 806 case BIO_READ: 807 case BIO_WRITE: 808 case BIO_DELETE: 809 break; 810 default: 811 return (EOPNOTSUPP); 812 } 813 814 p = bp->bio_data; 815 ma_offs = (bp->bio_flags & BIO_UNMAPPED) == 0 ? 0 : bp->bio_ma_offset; 816 817 /* 818 * offs is the offset at which to start operating on the 819 * next (ie, first) page. lastp is the last page on 820 * which we're going to operate. lastend is the ending 821 * position within that last page (ie, PAGE_SIZE if 822 * we're operating on complete aligned pages). 823 */ 824 offs = bp->bio_offset % PAGE_SIZE; 825 lastp = (bp->bio_offset + bp->bio_length - 1) / PAGE_SIZE; 826 lastend = (bp->bio_offset + bp->bio_length - 1) % PAGE_SIZE + 1; 827 828 rv = VM_PAGER_OK; 829 VM_OBJECT_WLOCK(sc->object); 830 vm_object_pip_add(sc->object, 1); 831 for (i = bp->bio_offset / PAGE_SIZE; i <= lastp; i++) { 832 len = ((i == lastp) ? lastend : PAGE_SIZE) - offs; 833 m = vm_page_grab(sc->object, i, VM_ALLOC_SYSTEM); 834 if (bp->bio_cmd == BIO_READ) { 835 if (m->valid == VM_PAGE_BITS_ALL) 836 rv = VM_PAGER_OK; 837 else 838 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 839 if (rv == VM_PAGER_ERROR) { 840 vm_page_xunbusy(m); 841 break; 842 } else if (rv == VM_PAGER_FAIL) { 843 /* 844 * Pager does not have the page. Zero 845 * the allocated page, and mark it as 846 * valid. Do not set dirty, the page 847 * can be recreated if thrown out. 848 */ 849 pmap_zero_page(m); 850 m->valid = VM_PAGE_BITS_ALL; 851 } 852 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 853 pmap_copy_pages(&m, offs, bp->bio_ma, 854 ma_offs, len); 855 } else { 856 physcopyout(VM_PAGE_TO_PHYS(m) + offs, p, len); 857 cpu_flush_dcache(p, len); 858 } 859 } else if (bp->bio_cmd == BIO_WRITE) { 860 if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL) 861 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 862 else 863 rv = VM_PAGER_OK; 864 if (rv == VM_PAGER_ERROR) { 865 vm_page_xunbusy(m); 866 break; 867 } 868 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 869 pmap_copy_pages(bp->bio_ma, ma_offs, &m, 870 offs, len); 871 } else { 872 physcopyin(p, VM_PAGE_TO_PHYS(m) + offs, len); 873 } 874 m->valid = VM_PAGE_BITS_ALL; 875 } else if (bp->bio_cmd == BIO_DELETE) { 876 if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL) 877 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 878 else 879 rv = VM_PAGER_OK; 880 if (rv == VM_PAGER_ERROR) { 881 vm_page_xunbusy(m); 882 break; 883 } 884 if (len != PAGE_SIZE) { 885 pmap_zero_page_area(m, offs, len); 886 vm_page_clear_dirty(m, offs, len); 887 m->valid = VM_PAGE_BITS_ALL; 888 } else 889 vm_pager_page_unswapped(m); 890 } 891 vm_page_xunbusy(m); 892 vm_page_lock(m); 893 if (bp->bio_cmd == BIO_DELETE && len == PAGE_SIZE) 894 vm_page_free(m); 895 else 896 vm_page_activate(m); 897 vm_page_unlock(m); 898 if (bp->bio_cmd == BIO_WRITE) { 899 vm_page_dirty(m); 900 vm_pager_page_unswapped(m); 901 } 902 903 /* Actions on further pages start at offset 0 */ 904 p += PAGE_SIZE - offs; 905 offs = 0; 906 ma_offs += len; 907 } 908 vm_object_pip_wakeup(sc->object); 909 VM_OBJECT_WUNLOCK(sc->object); 910 return (rv != VM_PAGER_ERROR ? 0 : ENOSPC); 911 } 912 913 static int 914 mdstart_null(struct md_s *sc, struct bio *bp) 915 { 916 917 switch (bp->bio_cmd) { 918 case BIO_READ: 919 bzero(bp->bio_data, bp->bio_length); 920 cpu_flush_dcache(bp->bio_data, bp->bio_length); 921 break; 922 case BIO_WRITE: 923 break; 924 } 925 bp->bio_resid = 0; 926 return (0); 927 } 928 929 static void 930 md_kthread(void *arg) 931 { 932 struct md_s *sc; 933 struct bio *bp; 934 int error; 935 936 sc = arg; 937 thread_lock(curthread); 938 sched_prio(curthread, PRIBIO); 939 thread_unlock(curthread); 940 if (sc->type == MD_VNODE) 941 curthread->td_pflags |= TDP_NORUNNINGBUF; 942 943 for (;;) { 944 mtx_lock(&sc->queue_mtx); 945 if (sc->flags & MD_SHUTDOWN) { 946 sc->flags |= MD_EXITING; 947 mtx_unlock(&sc->queue_mtx); 948 kproc_exit(0); 949 } 950 bp = bioq_takefirst(&sc->bio_queue); 951 if (!bp) { 952 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 953 continue; 954 } 955 mtx_unlock(&sc->queue_mtx); 956 if (bp->bio_cmd == BIO_GETATTR) { 957 if ((sc->fwsectors && sc->fwheads && 958 (g_handleattr_int(bp, "GEOM::fwsectors", 959 sc->fwsectors) || 960 g_handleattr_int(bp, "GEOM::fwheads", 961 sc->fwheads))) || 962 g_handleattr_int(bp, "GEOM::candelete", 1)) 963 error = -1; 964 else 965 error = EOPNOTSUPP; 966 } else { 967 error = sc->start(sc, bp); 968 } 969 970 if (error != -1) { 971 bp->bio_completed = bp->bio_length; 972 if ((bp->bio_cmd == BIO_READ) || (bp->bio_cmd == BIO_WRITE)) 973 devstat_end_transaction_bio(sc->devstat, bp); 974 g_io_deliver(bp, error); 975 } 976 } 977 } 978 979 static struct md_s * 980 mdfind(int unit) 981 { 982 struct md_s *sc; 983 984 LIST_FOREACH(sc, &md_softc_list, list) { 985 if (sc->unit == unit) 986 break; 987 } 988 return (sc); 989 } 990 991 static struct md_s * 992 mdnew(int unit, int *errp, enum md_types type) 993 { 994 struct md_s *sc; 995 int error; 996 997 *errp = 0; 998 if (unit == -1) 999 unit = alloc_unr(md_uh); 1000 else 1001 unit = alloc_unr_specific(md_uh, unit); 1002 1003 if (unit == -1) { 1004 *errp = EBUSY; 1005 return (NULL); 1006 } 1007 1008 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 1009 sc->type = type; 1010 bioq_init(&sc->bio_queue); 1011 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 1012 mtx_init(&sc->stat_mtx, "md stat", NULL, MTX_DEF); 1013 sc->unit = unit; 1014 sprintf(sc->name, "md%d", unit); 1015 LIST_INSERT_HEAD(&md_softc_list, sc, list); 1016 error = kproc_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 1017 if (error == 0) 1018 return (sc); 1019 LIST_REMOVE(sc, list); 1020 mtx_destroy(&sc->stat_mtx); 1021 mtx_destroy(&sc->queue_mtx); 1022 free_unr(md_uh, sc->unit); 1023 free(sc, M_MD); 1024 *errp = error; 1025 return (NULL); 1026 } 1027 1028 static void 1029 mdinit(struct md_s *sc) 1030 { 1031 struct g_geom *gp; 1032 struct g_provider *pp; 1033 1034 g_topology_lock(); 1035 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 1036 gp->softc = sc; 1037 pp = g_new_providerf(gp, "md%d", sc->unit); 1038 pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE; 1039 pp->mediasize = sc->mediasize; 1040 pp->sectorsize = sc->sectorsize; 1041 switch (sc->type) { 1042 case MD_MALLOC: 1043 case MD_VNODE: 1044 case MD_SWAP: 1045 pp->flags |= G_PF_ACCEPT_UNMAPPED; 1046 break; 1047 case MD_PRELOAD: 1048 case MD_NULL: 1049 break; 1050 } 1051 sc->gp = gp; 1052 sc->pp = pp; 1053 g_error_provider(pp, 0); 1054 g_topology_unlock(); 1055 sc->devstat = devstat_new_entry("md", sc->unit, sc->sectorsize, 1056 DEVSTAT_ALL_SUPPORTED, DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 1057 } 1058 1059 static int 1060 mdcreate_malloc(struct md_s *sc, struct md_ioctl *mdio) 1061 { 1062 uintptr_t sp; 1063 int error; 1064 off_t u; 1065 1066 error = 0; 1067 if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 1068 return (EINVAL); 1069 if (mdio->md_sectorsize != 0 && !powerof2(mdio->md_sectorsize)) 1070 return (EINVAL); 1071 /* Compression doesn't make sense if we have reserved space */ 1072 if (mdio->md_options & MD_RESERVE) 1073 mdio->md_options &= ~MD_COMPRESS; 1074 if (mdio->md_fwsectors != 0) 1075 sc->fwsectors = mdio->md_fwsectors; 1076 if (mdio->md_fwheads != 0) 1077 sc->fwheads = mdio->md_fwheads; 1078 sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE); 1079 sc->indir = dimension(sc->mediasize / sc->sectorsize); 1080 sc->uma = uma_zcreate(sc->name, sc->sectorsize, NULL, NULL, NULL, NULL, 1081 0x1ff, 0); 1082 if (mdio->md_options & MD_RESERVE) { 1083 off_t nsectors; 1084 1085 nsectors = sc->mediasize / sc->sectorsize; 1086 for (u = 0; u < nsectors; u++) { 1087 sp = (uintptr_t)uma_zalloc(sc->uma, (md_malloc_wait ? 1088 M_WAITOK : M_NOWAIT) | M_ZERO); 1089 if (sp != 0) 1090 error = s_write(sc->indir, u, sp); 1091 else 1092 error = ENOMEM; 1093 if (error != 0) 1094 break; 1095 } 1096 } 1097 return (error); 1098 } 1099 1100 1101 static int 1102 mdsetcred(struct md_s *sc, struct ucred *cred) 1103 { 1104 char *tmpbuf; 1105 int error = 0; 1106 1107 /* 1108 * Set credits in our softc 1109 */ 1110 1111 if (sc->cred) 1112 crfree(sc->cred); 1113 sc->cred = crhold(cred); 1114 1115 /* 1116 * Horrible kludge to establish credentials for NFS XXX. 1117 */ 1118 1119 if (sc->vnode) { 1120 struct uio auio; 1121 struct iovec aiov; 1122 1123 tmpbuf = malloc(sc->sectorsize, M_TEMP, M_WAITOK); 1124 bzero(&auio, sizeof(auio)); 1125 1126 aiov.iov_base = tmpbuf; 1127 aiov.iov_len = sc->sectorsize; 1128 auio.uio_iov = &aiov; 1129 auio.uio_iovcnt = 1; 1130 auio.uio_offset = 0; 1131 auio.uio_rw = UIO_READ; 1132 auio.uio_segflg = UIO_SYSSPACE; 1133 auio.uio_resid = aiov.iov_len; 1134 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY); 1135 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 1136 VOP_UNLOCK(sc->vnode, 0); 1137 free(tmpbuf, M_TEMP); 1138 } 1139 return (error); 1140 } 1141 1142 static int 1143 mdcreate_vnode(struct md_s *sc, struct md_ioctl *mdio, struct thread *td) 1144 { 1145 struct vattr vattr; 1146 struct nameidata nd; 1147 char *fname; 1148 int error, flags; 1149 1150 /* 1151 * Kernel-originated requests must have the filename appended 1152 * to the mdio structure to protect against malicious software. 1153 */ 1154 fname = mdio->md_file; 1155 if ((void *)fname != (void *)(mdio + 1)) { 1156 error = copyinstr(fname, sc->file, sizeof(sc->file), NULL); 1157 if (error != 0) 1158 return (error); 1159 } else 1160 strlcpy(sc->file, fname, sizeof(sc->file)); 1161 1162 /* 1163 * If the user specified that this is a read only device, don't 1164 * set the FWRITE mask before trying to open the backing store. 1165 */ 1166 flags = FREAD | ((mdio->md_options & MD_READONLY) ? 0 : FWRITE); 1167 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, sc->file, td); 1168 error = vn_open(&nd, &flags, 0, NULL); 1169 if (error != 0) 1170 return (error); 1171 NDFREE(&nd, NDF_ONLY_PNBUF); 1172 if (nd.ni_vp->v_type != VREG) { 1173 error = EINVAL; 1174 goto bad; 1175 } 1176 error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred); 1177 if (error != 0) 1178 goto bad; 1179 if (VOP_ISLOCKED(nd.ni_vp) != LK_EXCLUSIVE) { 1180 vn_lock(nd.ni_vp, LK_UPGRADE | LK_RETRY); 1181 if (nd.ni_vp->v_iflag & VI_DOOMED) { 1182 /* Forced unmount. */ 1183 error = EBADF; 1184 goto bad; 1185 } 1186 } 1187 nd.ni_vp->v_vflag |= VV_MD; 1188 VOP_UNLOCK(nd.ni_vp, 0); 1189 1190 if (mdio->md_fwsectors != 0) 1191 sc->fwsectors = mdio->md_fwsectors; 1192 if (mdio->md_fwheads != 0) 1193 sc->fwheads = mdio->md_fwheads; 1194 sc->flags = mdio->md_options & (MD_FORCE | MD_ASYNC); 1195 if (!(flags & FWRITE)) 1196 sc->flags |= MD_READONLY; 1197 sc->vnode = nd.ni_vp; 1198 1199 error = mdsetcred(sc, td->td_ucred); 1200 if (error != 0) { 1201 sc->vnode = NULL; 1202 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY); 1203 nd.ni_vp->v_vflag &= ~VV_MD; 1204 goto bad; 1205 } 1206 return (0); 1207 bad: 1208 VOP_UNLOCK(nd.ni_vp, 0); 1209 (void)vn_close(nd.ni_vp, flags, td->td_ucred, td); 1210 return (error); 1211 } 1212 1213 static int 1214 mddestroy(struct md_s *sc, struct thread *td) 1215 { 1216 1217 if (sc->gp) { 1218 sc->gp->softc = NULL; 1219 g_topology_lock(); 1220 g_wither_geom(sc->gp, ENXIO); 1221 g_topology_unlock(); 1222 sc->gp = NULL; 1223 sc->pp = NULL; 1224 } 1225 if (sc->devstat) { 1226 devstat_remove_entry(sc->devstat); 1227 sc->devstat = NULL; 1228 } 1229 mtx_lock(&sc->queue_mtx); 1230 sc->flags |= MD_SHUTDOWN; 1231 wakeup(sc); 1232 while (!(sc->flags & MD_EXITING)) 1233 msleep(sc->procp, &sc->queue_mtx, PRIBIO, "mddestroy", hz / 10); 1234 mtx_unlock(&sc->queue_mtx); 1235 mtx_destroy(&sc->stat_mtx); 1236 mtx_destroy(&sc->queue_mtx); 1237 if (sc->vnode != NULL) { 1238 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY); 1239 sc->vnode->v_vflag &= ~VV_MD; 1240 VOP_UNLOCK(sc->vnode, 0); 1241 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 1242 FREAD : (FREAD|FWRITE), sc->cred, td); 1243 } 1244 if (sc->cred != NULL) 1245 crfree(sc->cred); 1246 if (sc->object != NULL) 1247 vm_object_deallocate(sc->object); 1248 if (sc->indir) 1249 destroy_indir(sc, sc->indir); 1250 if (sc->uma) 1251 uma_zdestroy(sc->uma); 1252 1253 LIST_REMOVE(sc, list); 1254 free_unr(md_uh, sc->unit); 1255 free(sc, M_MD); 1256 return (0); 1257 } 1258 1259 static int 1260 mdresize(struct md_s *sc, struct md_ioctl *mdio) 1261 { 1262 int error, res; 1263 vm_pindex_t oldpages, newpages; 1264 1265 switch (sc->type) { 1266 case MD_VNODE: 1267 case MD_NULL: 1268 break; 1269 case MD_SWAP: 1270 if (mdio->md_mediasize <= 0 || 1271 (mdio->md_mediasize % PAGE_SIZE) != 0) 1272 return (EDOM); 1273 oldpages = OFF_TO_IDX(round_page(sc->mediasize)); 1274 newpages = OFF_TO_IDX(round_page(mdio->md_mediasize)); 1275 if (newpages < oldpages) { 1276 VM_OBJECT_WLOCK(sc->object); 1277 vm_object_page_remove(sc->object, newpages, 0, 0); 1278 swap_pager_freespace(sc->object, newpages, 1279 oldpages - newpages); 1280 swap_release_by_cred(IDX_TO_OFF(oldpages - 1281 newpages), sc->cred); 1282 sc->object->charge = IDX_TO_OFF(newpages); 1283 sc->object->size = newpages; 1284 VM_OBJECT_WUNLOCK(sc->object); 1285 } else if (newpages > oldpages) { 1286 res = swap_reserve_by_cred(IDX_TO_OFF(newpages - 1287 oldpages), sc->cred); 1288 if (!res) 1289 return (ENOMEM); 1290 if ((mdio->md_options & MD_RESERVE) || 1291 (sc->flags & MD_RESERVE)) { 1292 error = swap_pager_reserve(sc->object, 1293 oldpages, newpages - oldpages); 1294 if (error < 0) { 1295 swap_release_by_cred( 1296 IDX_TO_OFF(newpages - oldpages), 1297 sc->cred); 1298 return (EDOM); 1299 } 1300 } 1301 VM_OBJECT_WLOCK(sc->object); 1302 sc->object->charge = IDX_TO_OFF(newpages); 1303 sc->object->size = newpages; 1304 VM_OBJECT_WUNLOCK(sc->object); 1305 } 1306 break; 1307 default: 1308 return (EOPNOTSUPP); 1309 } 1310 1311 sc->mediasize = mdio->md_mediasize; 1312 g_topology_lock(); 1313 g_resize_provider(sc->pp, sc->mediasize); 1314 g_topology_unlock(); 1315 return (0); 1316 } 1317 1318 static int 1319 mdcreate_swap(struct md_s *sc, struct md_ioctl *mdio, struct thread *td) 1320 { 1321 vm_ooffset_t npage; 1322 int error; 1323 1324 /* 1325 * Range check. Disallow negative sizes and sizes not being 1326 * multiple of page size. 1327 */ 1328 if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0) 1329 return (EDOM); 1330 1331 /* 1332 * Allocate an OBJT_SWAP object. 1333 * 1334 * Note the truncation. 1335 */ 1336 1337 npage = mdio->md_mediasize / PAGE_SIZE; 1338 if (mdio->md_fwsectors != 0) 1339 sc->fwsectors = mdio->md_fwsectors; 1340 if (mdio->md_fwheads != 0) 1341 sc->fwheads = mdio->md_fwheads; 1342 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * npage, 1343 VM_PROT_DEFAULT, 0, td->td_ucred); 1344 if (sc->object == NULL) 1345 return (ENOMEM); 1346 sc->flags = mdio->md_options & (MD_FORCE | MD_RESERVE); 1347 if (mdio->md_options & MD_RESERVE) { 1348 if (swap_pager_reserve(sc->object, 0, npage) < 0) { 1349 error = EDOM; 1350 goto finish; 1351 } 1352 } 1353 error = mdsetcred(sc, td->td_ucred); 1354 finish: 1355 if (error != 0) { 1356 vm_object_deallocate(sc->object); 1357 sc->object = NULL; 1358 } 1359 return (error); 1360 } 1361 1362 static int 1363 mdcreate_null(struct md_s *sc, struct md_ioctl *mdio, struct thread *td) 1364 { 1365 1366 /* 1367 * Range check. Disallow negative sizes and sizes not being 1368 * multiple of page size. 1369 */ 1370 if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0) 1371 return (EDOM); 1372 1373 return (0); 1374 } 1375 1376 static int 1377 xmdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 1378 { 1379 struct md_ioctl *mdio; 1380 struct md_s *sc; 1381 int error, i; 1382 unsigned sectsize; 1383 1384 if (md_debug) 1385 printf("mdctlioctl(%s %lx %p %x %p)\n", 1386 devtoname(dev), cmd, addr, flags, td); 1387 1388 mdio = (struct md_ioctl *)addr; 1389 if (mdio->md_version != MDIOVERSION) 1390 return (EINVAL); 1391 1392 /* 1393 * We assert the version number in the individual ioctl 1394 * handlers instead of out here because (a) it is possible we 1395 * may add another ioctl in the future which doesn't read an 1396 * mdio, and (b) the correct return value for an unknown ioctl 1397 * is ENOIOCTL, not EINVAL. 1398 */ 1399 error = 0; 1400 switch (cmd) { 1401 case MDIOCATTACH: 1402 switch (mdio->md_type) { 1403 case MD_MALLOC: 1404 case MD_PRELOAD: 1405 case MD_VNODE: 1406 case MD_SWAP: 1407 case MD_NULL: 1408 break; 1409 default: 1410 return (EINVAL); 1411 } 1412 if (mdio->md_sectorsize == 0) 1413 sectsize = DEV_BSIZE; 1414 else 1415 sectsize = mdio->md_sectorsize; 1416 if (sectsize > MAXPHYS || mdio->md_mediasize < sectsize) 1417 return (EINVAL); 1418 if (mdio->md_options & MD_AUTOUNIT) 1419 sc = mdnew(-1, &error, mdio->md_type); 1420 else { 1421 if (mdio->md_unit > INT_MAX) 1422 return (EINVAL); 1423 sc = mdnew(mdio->md_unit, &error, mdio->md_type); 1424 } 1425 if (sc == NULL) 1426 return (error); 1427 if (mdio->md_options & MD_AUTOUNIT) 1428 mdio->md_unit = sc->unit; 1429 sc->mediasize = mdio->md_mediasize; 1430 sc->sectorsize = sectsize; 1431 error = EDOOFUS; 1432 switch (sc->type) { 1433 case MD_MALLOC: 1434 sc->start = mdstart_malloc; 1435 error = mdcreate_malloc(sc, mdio); 1436 break; 1437 case MD_PRELOAD: 1438 /* 1439 * We disallow attaching preloaded memory disks via 1440 * ioctl. Preloaded memory disks are automatically 1441 * attached in g_md_init(). 1442 */ 1443 error = EOPNOTSUPP; 1444 break; 1445 case MD_VNODE: 1446 sc->start = mdstart_vnode; 1447 error = mdcreate_vnode(sc, mdio, td); 1448 break; 1449 case MD_SWAP: 1450 sc->start = mdstart_swap; 1451 error = mdcreate_swap(sc, mdio, td); 1452 break; 1453 case MD_NULL: 1454 sc->start = mdstart_null; 1455 error = mdcreate_null(sc, mdio, td); 1456 break; 1457 } 1458 if (error != 0) { 1459 mddestroy(sc, td); 1460 return (error); 1461 } 1462 1463 /* Prune off any residual fractional sector */ 1464 i = sc->mediasize % sc->sectorsize; 1465 sc->mediasize -= i; 1466 1467 mdinit(sc); 1468 return (0); 1469 case MDIOCDETACH: 1470 if (mdio->md_mediasize != 0 || 1471 (mdio->md_options & ~MD_FORCE) != 0) 1472 return (EINVAL); 1473 1474 sc = mdfind(mdio->md_unit); 1475 if (sc == NULL) 1476 return (ENOENT); 1477 if (sc->opencount != 0 && !(sc->flags & MD_FORCE) && 1478 !(mdio->md_options & MD_FORCE)) 1479 return (EBUSY); 1480 return (mddestroy(sc, td)); 1481 case MDIOCRESIZE: 1482 if ((mdio->md_options & ~(MD_FORCE | MD_RESERVE)) != 0) 1483 return (EINVAL); 1484 1485 sc = mdfind(mdio->md_unit); 1486 if (sc == NULL) 1487 return (ENOENT); 1488 if (mdio->md_mediasize < sc->sectorsize) 1489 return (EINVAL); 1490 if (mdio->md_mediasize < sc->mediasize && 1491 !(sc->flags & MD_FORCE) && 1492 !(mdio->md_options & MD_FORCE)) 1493 return (EBUSY); 1494 return (mdresize(sc, mdio)); 1495 case MDIOCQUERY: 1496 sc = mdfind(mdio->md_unit); 1497 if (sc == NULL) 1498 return (ENOENT); 1499 mdio->md_type = sc->type; 1500 mdio->md_options = sc->flags; 1501 mdio->md_mediasize = sc->mediasize; 1502 mdio->md_sectorsize = sc->sectorsize; 1503 if (sc->type == MD_VNODE) 1504 error = copyout(sc->file, mdio->md_file, 1505 strlen(sc->file) + 1); 1506 return (error); 1507 case MDIOCLIST: 1508 i = 1; 1509 LIST_FOREACH(sc, &md_softc_list, list) { 1510 if (i == MDNPAD - 1) 1511 mdio->md_pad[i] = -1; 1512 else 1513 mdio->md_pad[i++] = sc->unit; 1514 } 1515 mdio->md_pad[0] = i - 1; 1516 return (0); 1517 default: 1518 return (ENOIOCTL); 1519 }; 1520 } 1521 1522 static int 1523 mdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 1524 { 1525 int error; 1526 1527 sx_xlock(&md_sx); 1528 error = xmdctlioctl(dev, cmd, addr, flags, td); 1529 sx_xunlock(&md_sx); 1530 return (error); 1531 } 1532 1533 static void 1534 md_preloaded(u_char *image, size_t length, const char *name) 1535 { 1536 struct md_s *sc; 1537 int error; 1538 1539 sc = mdnew(-1, &error, MD_PRELOAD); 1540 if (sc == NULL) 1541 return; 1542 sc->mediasize = length; 1543 sc->sectorsize = DEV_BSIZE; 1544 sc->pl_ptr = image; 1545 sc->pl_len = length; 1546 sc->start = mdstart_preload; 1547 #ifdef MD_ROOT 1548 if (sc->unit == 0) 1549 rootdevnames[0] = MD_ROOT_FSTYPE ":/dev/md0"; 1550 #endif 1551 mdinit(sc); 1552 if (name != NULL) { 1553 printf("%s%d: Preloaded image <%s> %zd bytes at %p\n", 1554 MD_NAME, sc->unit, name, length, image); 1555 } 1556 } 1557 1558 static void 1559 g_md_init(struct g_class *mp __unused) 1560 { 1561 caddr_t mod; 1562 u_char *ptr, *name, *type; 1563 unsigned len; 1564 int i; 1565 1566 /* figure out log2(NINDIR) */ 1567 for (i = NINDIR, nshift = -1; i; nshift++) 1568 i >>= 1; 1569 1570 mod = NULL; 1571 sx_init(&md_sx, "MD config lock"); 1572 g_topology_unlock(); 1573 md_uh = new_unrhdr(0, INT_MAX, NULL); 1574 #ifdef MD_ROOT_SIZE 1575 sx_xlock(&md_sx); 1576 md_preloaded(mfs_root.start, sizeof(mfs_root.start), NULL); 1577 sx_xunlock(&md_sx); 1578 #endif 1579 /* XXX: are preload_* static or do they need Giant ? */ 1580 while ((mod = preload_search_next_name(mod)) != NULL) { 1581 name = (char *)preload_search_info(mod, MODINFO_NAME); 1582 if (name == NULL) 1583 continue; 1584 type = (char *)preload_search_info(mod, MODINFO_TYPE); 1585 if (type == NULL) 1586 continue; 1587 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 1588 continue; 1589 ptr = preload_fetch_addr(mod); 1590 len = preload_fetch_size(mod); 1591 if (ptr != NULL && len != 0) { 1592 sx_xlock(&md_sx); 1593 md_preloaded(ptr, len, name); 1594 sx_xunlock(&md_sx); 1595 } 1596 } 1597 md_vnode_pbuf_freecnt = nswbuf / 10; 1598 status_dev = make_dev(&mdctl_cdevsw, INT_MAX, UID_ROOT, GID_WHEEL, 1599 0600, MDCTL_NAME); 1600 g_topology_lock(); 1601 } 1602 1603 static void 1604 g_md_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 1605 struct g_consumer *cp __unused, struct g_provider *pp) 1606 { 1607 struct md_s *mp; 1608 char *type; 1609 1610 mp = gp->softc; 1611 if (mp == NULL) 1612 return; 1613 1614 switch (mp->type) { 1615 case MD_MALLOC: 1616 type = "malloc"; 1617 break; 1618 case MD_PRELOAD: 1619 type = "preload"; 1620 break; 1621 case MD_VNODE: 1622 type = "vnode"; 1623 break; 1624 case MD_SWAP: 1625 type = "swap"; 1626 break; 1627 case MD_NULL: 1628 type = "null"; 1629 break; 1630 default: 1631 type = "unknown"; 1632 break; 1633 } 1634 1635 if (pp != NULL) { 1636 if (indent == NULL) { 1637 sbuf_printf(sb, " u %d", mp->unit); 1638 sbuf_printf(sb, " s %ju", (uintmax_t) mp->sectorsize); 1639 sbuf_printf(sb, " f %ju", (uintmax_t) mp->fwheads); 1640 sbuf_printf(sb, " fs %ju", (uintmax_t) mp->fwsectors); 1641 sbuf_printf(sb, " l %ju", (uintmax_t) mp->mediasize); 1642 sbuf_printf(sb, " t %s", type); 1643 if (mp->type == MD_VNODE && mp->vnode != NULL) 1644 sbuf_printf(sb, " file %s", mp->file); 1645 } else { 1646 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent, 1647 mp->unit); 1648 sbuf_printf(sb, "%s<sectorsize>%ju</sectorsize>\n", 1649 indent, (uintmax_t) mp->sectorsize); 1650 sbuf_printf(sb, "%s<fwheads>%ju</fwheads>\n", 1651 indent, (uintmax_t) mp->fwheads); 1652 sbuf_printf(sb, "%s<fwsectors>%ju</fwsectors>\n", 1653 indent, (uintmax_t) mp->fwsectors); 1654 sbuf_printf(sb, "%s<length>%ju</length>\n", 1655 indent, (uintmax_t) mp->mediasize); 1656 sbuf_printf(sb, "%s<compression>%s</compression>\n", indent, 1657 (mp->flags & MD_COMPRESS) == 0 ? "off": "on"); 1658 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 1659 (mp->flags & MD_READONLY) == 0 ? "read-write": 1660 "read-only"); 1661 sbuf_printf(sb, "%s<type>%s</type>\n", indent, 1662 type); 1663 if (mp->type == MD_VNODE && mp->vnode != NULL) 1664 sbuf_printf(sb, "%s<file>%s</file>\n", 1665 indent, mp->file); 1666 } 1667 } 1668 } 1669 1670 static void 1671 g_md_fini(struct g_class *mp __unused) 1672 { 1673 1674 sx_destroy(&md_sx); 1675 if (status_dev != NULL) 1676 destroy_dev(status_dev); 1677 delete_unrhdr(md_uh); 1678 } 1679