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