1 /*- 2 * SPDX-License-Identifier: (Beerware AND BSD-3-Clause) 3 * 4 * ---------------------------------------------------------------------------- 5 * "THE BEER-WARE LICENSE" (Revision 42): 6 * <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you 7 * can do whatever you want with this stuff. If we meet some day, and you think 8 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 9 * ---------------------------------------------------------------------------- 10 * 11 */ 12 13 /*- 14 * The following functions are based on 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 * 3. 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 * From: src/sys/dev/vn/vn.c,v 1.122 2000/12/16 16:06:03 57 */ 58 59 #include "opt_rootdevname.h" 60 #include "opt_geom.h" 61 #include "opt_md.h" 62 63 #include <sys/param.h> 64 #include <sys/systm.h> 65 #include <sys/bio.h> 66 #include <sys/buf.h> 67 #include <sys/conf.h> 68 #include <sys/devicestat.h> 69 #include <sys/fcntl.h> 70 #include <sys/kernel.h> 71 #include <sys/kthread.h> 72 #include <sys/limits.h> 73 #include <sys/linker.h> 74 #include <sys/lock.h> 75 #include <sys/malloc.h> 76 #include <sys/mdioctl.h> 77 #include <sys/mount.h> 78 #include <sys/mutex.h> 79 #include <sys/sx.h> 80 #include <sys/namei.h> 81 #include <sys/proc.h> 82 #include <sys/queue.h> 83 #include <sys/rwlock.h> 84 #include <sys/sbuf.h> 85 #include <sys/sched.h> 86 #include <sys/sf_buf.h> 87 #include <sys/sysctl.h> 88 #include <sys/uio.h> 89 #include <sys/unistd.h> 90 #include <sys/vnode.h> 91 #include <sys/disk.h> 92 93 #include <geom/geom.h> 94 #include <geom/geom_int.h> 95 96 #include <vm/vm.h> 97 #include <vm/vm_extern.h> 98 #include <vm/vm_param.h> 99 #include <vm/vm_object.h> 100 #include <vm/vm_page.h> 101 #include <vm/vm_pager.h> 102 #include <vm/swap_pager.h> 103 #include <vm/uma.h> 104 105 #include <machine/bus.h> 106 107 #define MD_MODVER 1 108 109 #define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */ 110 #define MD_EXITING 0x20000 /* Worker thread is exiting. */ 111 #define MD_PROVIDERGONE 0x40000 /* Safe to free the softc */ 112 113 #ifndef MD_NSECT 114 #define MD_NSECT (10000 * 2) 115 #endif 116 117 struct md_req { 118 unsigned md_unit; /* unit number */ 119 enum md_types md_type; /* type of disk */ 120 off_t md_mediasize; /* size of disk in bytes */ 121 unsigned md_sectorsize; /* sectorsize */ 122 unsigned md_options; /* options */ 123 int md_fwheads; /* firmware heads */ 124 int md_fwsectors; /* firmware sectors */ 125 char *md_file; /* pathname of file to mount */ 126 enum uio_seg md_file_seg; /* location of md_file */ 127 char *md_label; /* label of the device (userspace) */ 128 int *md_units; /* pointer to units array (kernel) */ 129 size_t md_units_nitems; /* items in md_units array */ 130 }; 131 132 #ifdef COMPAT_FREEBSD32 133 struct md_ioctl32 { 134 unsigned md_version; 135 unsigned md_unit; 136 enum md_types md_type; 137 uint32_t md_file; 138 off_t md_mediasize; 139 unsigned md_sectorsize; 140 unsigned md_options; 141 uint64_t md_base; 142 int md_fwheads; 143 int md_fwsectors; 144 uint32_t md_label; 145 int md_pad[MDNPAD]; 146 } 147 #ifdef __amd64__ 148 __attribute__((__packed__)) 149 #endif 150 ; 151 #ifndef __amd64__ 152 CTASSERT((sizeof(struct md_ioctl32)) == 440); 153 #else 154 CTASSERT((sizeof(struct md_ioctl32)) == 436); 155 #endif 156 157 #define MDIOCATTACH_32 _IOC_NEWTYPE(MDIOCATTACH, struct md_ioctl32) 158 #define MDIOCDETACH_32 _IOC_NEWTYPE(MDIOCDETACH, struct md_ioctl32) 159 #define MDIOCQUERY_32 _IOC_NEWTYPE(MDIOCQUERY, struct md_ioctl32) 160 #define MDIOCRESIZE_32 _IOC_NEWTYPE(MDIOCRESIZE, struct md_ioctl32) 161 #endif /* COMPAT_FREEBSD32 */ 162 163 static MALLOC_DEFINE(M_MD, "md_disk", "Memory Disk"); 164 static MALLOC_DEFINE(M_MDSECT, "md_sectors", "Memory Disk Sectors"); 165 166 static int md_debug; 167 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, 168 "Enable md(4) debug messages"); 169 static int md_malloc_wait; 170 SYSCTL_INT(_vm, OID_AUTO, md_malloc_wait, CTLFLAG_RW, &md_malloc_wait, 0, 171 "Allow malloc to wait for memory allocations"); 172 173 #if defined(MD_ROOT) && !defined(MD_ROOT_FSTYPE) 174 #define MD_ROOT_FSTYPE "ufs" 175 #endif 176 177 #if defined(MD_ROOT) 178 /* 179 * Preloaded image gets put here. 180 */ 181 #if defined(MD_ROOT_SIZE) 182 /* 183 * We put the mfs_root symbol into the oldmfs section of the kernel object file. 184 * Applications that patch the object with the image can determine 185 * the size looking at the oldmfs section size within the kernel. 186 */ 187 u_char mfs_root[MD_ROOT_SIZE*1024] __attribute__ ((section ("oldmfs"))); 188 const int mfs_root_size = sizeof(mfs_root); 189 #elif defined(MD_ROOT_MEM) 190 /* MD region already mapped in the memory */ 191 u_char *mfs_root; 192 int mfs_root_size; 193 #else 194 extern volatile u_char __weak_symbol mfs_root; 195 extern volatile u_char __weak_symbol mfs_root_end; 196 #define mfs_root_size ((uintptr_t)(&mfs_root_end - &mfs_root)) 197 #endif 198 #endif 199 200 static g_init_t g_md_init; 201 static g_fini_t g_md_fini; 202 static g_start_t g_md_start; 203 static g_access_t g_md_access; 204 static void g_md_dumpconf(struct sbuf *sb, const char *indent, 205 struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp); 206 static g_provgone_t g_md_providergone; 207 208 static struct cdev *status_dev = NULL; 209 static struct sx md_sx; 210 static struct unrhdr *md_uh; 211 212 static d_ioctl_t mdctlioctl; 213 214 static struct cdevsw mdctl_cdevsw = { 215 .d_version = D_VERSION, 216 .d_ioctl = mdctlioctl, 217 .d_name = MD_NAME, 218 }; 219 220 struct g_class g_md_class = { 221 .name = "MD", 222 .version = G_VERSION, 223 .init = g_md_init, 224 .fini = g_md_fini, 225 .start = g_md_start, 226 .access = g_md_access, 227 .dumpconf = g_md_dumpconf, 228 .providergone = g_md_providergone, 229 }; 230 231 DECLARE_GEOM_CLASS(g_md_class, g_md); 232 MODULE_VERSION(geom_md, 0); 233 234 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(md_softc_list); 235 236 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 237 #define NMASK (NINDIR-1) 238 static int nshift; 239 240 struct indir { 241 uintptr_t *array; 242 u_int total; 243 u_int used; 244 u_int shift; 245 }; 246 247 struct md_s { 248 int unit; 249 LIST_ENTRY(md_s) list; 250 struct bio_queue_head bio_queue; 251 struct mtx queue_mtx; 252 struct cdev *dev; 253 enum md_types type; 254 off_t mediasize; 255 unsigned sectorsize; 256 unsigned opencount; 257 unsigned fwheads; 258 unsigned fwsectors; 259 char ident[32]; 260 unsigned flags; 261 char name[20]; 262 struct proc *procp; 263 struct g_geom *gp; 264 struct g_provider *pp; 265 int (*start)(struct md_s *sc, struct bio *bp); 266 struct devstat *devstat; 267 bool candelete; 268 269 /* MD_MALLOC related fields */ 270 struct indir *indir; 271 uma_zone_t uma; 272 273 /* MD_PRELOAD related fields */ 274 u_char *pl_ptr; 275 size_t pl_len; 276 277 /* MD_VNODE related fields */ 278 struct vnode *vnode; 279 char file[PATH_MAX]; 280 char label[PATH_MAX]; 281 struct ucred *cred; 282 vm_offset_t kva; 283 284 /* MD_SWAP related fields */ 285 vm_object_t object; 286 }; 287 288 static struct indir * 289 new_indir(u_int shift) 290 { 291 struct indir *ip; 292 293 ip = malloc(sizeof *ip, M_MD, (md_malloc_wait ? M_WAITOK : M_NOWAIT) 294 | M_ZERO); 295 if (ip == NULL) 296 return (NULL); 297 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 298 M_MDSECT, (md_malloc_wait ? M_WAITOK : M_NOWAIT) | M_ZERO); 299 if (ip->array == NULL) { 300 free(ip, M_MD); 301 return (NULL); 302 } 303 ip->total = NINDIR; 304 ip->shift = shift; 305 return (ip); 306 } 307 308 static void 309 del_indir(struct indir *ip) 310 { 311 312 free(ip->array, M_MDSECT); 313 free(ip, M_MD); 314 } 315 316 static void 317 destroy_indir(struct md_s *sc, struct indir *ip) 318 { 319 int i; 320 321 for (i = 0; i < NINDIR; i++) { 322 if (!ip->array[i]) 323 continue; 324 if (ip->shift) 325 destroy_indir(sc, (struct indir*)(ip->array[i])); 326 else if (ip->array[i] > 255) 327 uma_zfree(sc->uma, (void *)(ip->array[i])); 328 } 329 del_indir(ip); 330 } 331 332 /* 333 * This function does the math and allocates the top level "indir" structure 334 * for a device of "size" sectors. 335 */ 336 337 static struct indir * 338 dimension(off_t size) 339 { 340 off_t rcnt; 341 struct indir *ip; 342 int layer; 343 344 rcnt = size; 345 layer = 0; 346 while (rcnt > NINDIR) { 347 rcnt /= NINDIR; 348 layer++; 349 } 350 351 /* 352 * XXX: the top layer is probably not fully populated, so we allocate 353 * too much space for ip->array in here. 354 */ 355 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO); 356 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 357 M_MDSECT, M_WAITOK | M_ZERO); 358 ip->total = NINDIR; 359 ip->shift = layer * nshift; 360 return (ip); 361 } 362 363 /* 364 * Read a given sector 365 */ 366 367 static uintptr_t 368 s_read(struct indir *ip, off_t offset) 369 { 370 struct indir *cip; 371 int idx; 372 uintptr_t up; 373 374 if (md_debug > 1) 375 printf("s_read(%jd)\n", (intmax_t)offset); 376 up = 0; 377 for (cip = ip; cip != NULL;) { 378 if (cip->shift) { 379 idx = (offset >> cip->shift) & NMASK; 380 up = cip->array[idx]; 381 cip = (struct indir *)up; 382 continue; 383 } 384 idx = offset & NMASK; 385 return (cip->array[idx]); 386 } 387 return (0); 388 } 389 390 /* 391 * Write a given sector, prune the tree if the value is 0 392 */ 393 394 static int 395 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 396 { 397 struct indir *cip, *lip[10]; 398 int idx, li; 399 uintptr_t up; 400 401 if (md_debug > 1) 402 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 403 up = 0; 404 li = 0; 405 cip = ip; 406 for (;;) { 407 lip[li++] = cip; 408 if (cip->shift) { 409 idx = (offset >> cip->shift) & NMASK; 410 up = cip->array[idx]; 411 if (up != 0) { 412 cip = (struct indir *)up; 413 continue; 414 } 415 /* Allocate branch */ 416 cip->array[idx] = 417 (uintptr_t)new_indir(cip->shift - nshift); 418 if (cip->array[idx] == 0) 419 return (ENOSPC); 420 cip->used++; 421 up = cip->array[idx]; 422 cip = (struct indir *)up; 423 continue; 424 } 425 /* leafnode */ 426 idx = offset & NMASK; 427 up = cip->array[idx]; 428 if (up != 0) 429 cip->used--; 430 cip->array[idx] = ptr; 431 if (ptr != 0) 432 cip->used++; 433 break; 434 } 435 if (cip->used != 0 || li == 1) 436 return (0); 437 li--; 438 while (cip->used == 0 && cip != ip) { 439 li--; 440 idx = (offset >> lip[li]->shift) & NMASK; 441 up = lip[li]->array[idx]; 442 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 443 del_indir(cip); 444 lip[li]->array[idx] = 0; 445 lip[li]->used--; 446 cip = lip[li]; 447 } 448 return (0); 449 } 450 451 static int 452 g_md_access(struct g_provider *pp, int r, int w, int e) 453 { 454 struct md_s *sc; 455 456 sc = pp->geom->softc; 457 if (sc == NULL) { 458 if (r <= 0 && w <= 0 && e <= 0) 459 return (0); 460 return (ENXIO); 461 } 462 r += pp->acr; 463 w += pp->acw; 464 e += pp->ace; 465 if ((sc->flags & MD_READONLY) != 0 && w > 0) 466 return (EROFS); 467 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 468 sc->opencount = 1; 469 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 470 sc->opencount = 0; 471 } 472 return (0); 473 } 474 475 static void 476 g_md_start(struct bio *bp) 477 { 478 struct md_s *sc; 479 480 sc = bp->bio_to->geom->softc; 481 if ((bp->bio_cmd == BIO_READ) || (bp->bio_cmd == BIO_WRITE)) { 482 devstat_start_transaction_bio(sc->devstat, bp); 483 } 484 mtx_lock(&sc->queue_mtx); 485 bioq_disksort(&sc->bio_queue, bp); 486 wakeup(sc); 487 mtx_unlock(&sc->queue_mtx); 488 } 489 490 #define MD_MALLOC_MOVE_ZERO 1 491 #define MD_MALLOC_MOVE_FILL 2 492 #define MD_MALLOC_MOVE_READ 3 493 #define MD_MALLOC_MOVE_WRITE 4 494 #define MD_MALLOC_MOVE_CMP 5 495 496 static int 497 md_malloc_move_ma(vm_page_t **mp, int *ma_offs, unsigned sectorsize, 498 void *ptr, u_char fill, int op) 499 { 500 struct sf_buf *sf; 501 vm_page_t m, *mp1; 502 char *p, first; 503 off_t *uc; 504 unsigned n; 505 int error, i, ma_offs1, sz, first_read; 506 507 m = NULL; 508 error = 0; 509 sf = NULL; 510 /* if (op == MD_MALLOC_MOVE_CMP) { gcc */ 511 first = 0; 512 first_read = 0; 513 uc = ptr; 514 mp1 = *mp; 515 ma_offs1 = *ma_offs; 516 /* } */ 517 sched_pin(); 518 for (n = sectorsize; n != 0; n -= sz) { 519 sz = imin(PAGE_SIZE - *ma_offs, n); 520 if (m != **mp) { 521 if (sf != NULL) 522 sf_buf_free(sf); 523 m = **mp; 524 sf = sf_buf_alloc(m, SFB_CPUPRIVATE | 525 (md_malloc_wait ? 0 : SFB_NOWAIT)); 526 if (sf == NULL) { 527 error = ENOMEM; 528 break; 529 } 530 } 531 p = (char *)sf_buf_kva(sf) + *ma_offs; 532 switch (op) { 533 case MD_MALLOC_MOVE_ZERO: 534 bzero(p, sz); 535 break; 536 case MD_MALLOC_MOVE_FILL: 537 memset(p, fill, sz); 538 break; 539 case MD_MALLOC_MOVE_READ: 540 bcopy(ptr, p, sz); 541 cpu_flush_dcache(p, sz); 542 break; 543 case MD_MALLOC_MOVE_WRITE: 544 bcopy(p, ptr, sz); 545 break; 546 case MD_MALLOC_MOVE_CMP: 547 for (i = 0; i < sz; i++, p++) { 548 if (!first_read) { 549 *uc = (u_char)*p; 550 first = *p; 551 first_read = 1; 552 } else if (*p != first) { 553 error = EDOOFUS; 554 break; 555 } 556 } 557 break; 558 default: 559 KASSERT(0, ("md_malloc_move_ma unknown op %d\n", op)); 560 break; 561 } 562 if (error != 0) 563 break; 564 *ma_offs += sz; 565 *ma_offs %= PAGE_SIZE; 566 if (*ma_offs == 0) 567 (*mp)++; 568 ptr = (char *)ptr + sz; 569 } 570 571 if (sf != NULL) 572 sf_buf_free(sf); 573 sched_unpin(); 574 if (op == MD_MALLOC_MOVE_CMP && error != 0) { 575 *mp = mp1; 576 *ma_offs = ma_offs1; 577 } 578 return (error); 579 } 580 581 static int 582 md_malloc_move_vlist(bus_dma_segment_t **pvlist, int *pma_offs, 583 unsigned len, void *ptr, u_char fill, int op) 584 { 585 bus_dma_segment_t *vlist; 586 uint8_t *p, *end, first; 587 off_t *uc; 588 int ma_offs, seg_len; 589 590 vlist = *pvlist; 591 ma_offs = *pma_offs; 592 uc = ptr; 593 594 for (; len != 0; len -= seg_len) { 595 seg_len = imin(vlist->ds_len - ma_offs, len); 596 p = (uint8_t *)(uintptr_t)vlist->ds_addr + ma_offs; 597 switch (op) { 598 case MD_MALLOC_MOVE_ZERO: 599 bzero(p, seg_len); 600 break; 601 case MD_MALLOC_MOVE_FILL: 602 memset(p, fill, seg_len); 603 break; 604 case MD_MALLOC_MOVE_READ: 605 bcopy(ptr, p, seg_len); 606 cpu_flush_dcache(p, seg_len); 607 break; 608 case MD_MALLOC_MOVE_WRITE: 609 bcopy(p, ptr, seg_len); 610 break; 611 case MD_MALLOC_MOVE_CMP: 612 end = p + seg_len; 613 first = *uc = *p; 614 /* Confirm all following bytes match the first */ 615 while (++p < end) { 616 if (*p != first) 617 return (EDOOFUS); 618 } 619 break; 620 default: 621 KASSERT(0, ("md_malloc_move_vlist unknown op %d\n", op)); 622 break; 623 } 624 625 ma_offs += seg_len; 626 if (ma_offs == vlist->ds_len) { 627 ma_offs = 0; 628 vlist++; 629 } 630 ptr = (uint8_t *)ptr + seg_len; 631 } 632 *pvlist = vlist; 633 *pma_offs = ma_offs; 634 635 return (0); 636 } 637 638 static int 639 mdstart_malloc(struct md_s *sc, struct bio *bp) 640 { 641 u_char *dst; 642 vm_page_t *m; 643 bus_dma_segment_t *vlist; 644 int i, error, error1, ma_offs, notmapped; 645 off_t secno, nsec, uc; 646 uintptr_t sp, osp; 647 648 switch (bp->bio_cmd) { 649 case BIO_READ: 650 case BIO_WRITE: 651 case BIO_DELETE: 652 break; 653 case BIO_FLUSH: 654 return (0); 655 default: 656 return (EOPNOTSUPP); 657 } 658 659 notmapped = (bp->bio_flags & BIO_UNMAPPED) != 0; 660 vlist = (bp->bio_flags & BIO_VLIST) != 0 ? 661 (bus_dma_segment_t *)bp->bio_data : NULL; 662 if (notmapped) { 663 m = bp->bio_ma; 664 ma_offs = bp->bio_ma_offset; 665 dst = NULL; 666 KASSERT(vlist == NULL, ("vlists cannot be unmapped")); 667 } else if (vlist != NULL) { 668 ma_offs = bp->bio_ma_offset; 669 dst = NULL; 670 } else { 671 dst = bp->bio_data; 672 } 673 674 nsec = bp->bio_length / sc->sectorsize; 675 secno = bp->bio_offset / sc->sectorsize; 676 error = 0; 677 while (nsec--) { 678 osp = s_read(sc->indir, secno); 679 if (bp->bio_cmd == BIO_DELETE) { 680 if (osp != 0) 681 error = s_write(sc->indir, secno, 0); 682 } else if (bp->bio_cmd == BIO_READ) { 683 if (osp == 0) { 684 if (notmapped) { 685 error = md_malloc_move_ma(&m, &ma_offs, 686 sc->sectorsize, NULL, 0, 687 MD_MALLOC_MOVE_ZERO); 688 } else if (vlist != NULL) { 689 error = md_malloc_move_vlist(&vlist, 690 &ma_offs, sc->sectorsize, NULL, 0, 691 MD_MALLOC_MOVE_ZERO); 692 } else 693 bzero(dst, sc->sectorsize); 694 } else if (osp <= 255) { 695 if (notmapped) { 696 error = md_malloc_move_ma(&m, &ma_offs, 697 sc->sectorsize, NULL, osp, 698 MD_MALLOC_MOVE_FILL); 699 } else if (vlist != NULL) { 700 error = md_malloc_move_vlist(&vlist, 701 &ma_offs, sc->sectorsize, NULL, osp, 702 MD_MALLOC_MOVE_FILL); 703 } else 704 memset(dst, osp, sc->sectorsize); 705 } else { 706 if (notmapped) { 707 error = md_malloc_move_ma(&m, &ma_offs, 708 sc->sectorsize, (void *)osp, 0, 709 MD_MALLOC_MOVE_READ); 710 } else if (vlist != NULL) { 711 error = md_malloc_move_vlist(&vlist, 712 &ma_offs, sc->sectorsize, 713 (void *)osp, 0, 714 MD_MALLOC_MOVE_READ); 715 } else { 716 bcopy((void *)osp, dst, sc->sectorsize); 717 cpu_flush_dcache(dst, sc->sectorsize); 718 } 719 } 720 osp = 0; 721 } else if (bp->bio_cmd == BIO_WRITE) { 722 if (sc->flags & MD_COMPRESS) { 723 if (notmapped) { 724 error1 = md_malloc_move_ma(&m, &ma_offs, 725 sc->sectorsize, &uc, 0, 726 MD_MALLOC_MOVE_CMP); 727 i = error1 == 0 ? sc->sectorsize : 0; 728 } else if (vlist != NULL) { 729 error1 = md_malloc_move_vlist(&vlist, 730 &ma_offs, sc->sectorsize, &uc, 0, 731 MD_MALLOC_MOVE_CMP); 732 i = error1 == 0 ? sc->sectorsize : 0; 733 } else { 734 uc = dst[0]; 735 for (i = 1; i < sc->sectorsize; i++) { 736 if (dst[i] != uc) 737 break; 738 } 739 } 740 } else { 741 i = 0; 742 uc = 0; 743 } 744 if (i == sc->sectorsize) { 745 if (osp != uc) 746 error = s_write(sc->indir, secno, uc); 747 } else { 748 if (osp <= 255) { 749 sp = (uintptr_t)uma_zalloc(sc->uma, 750 md_malloc_wait ? M_WAITOK : 751 M_NOWAIT); 752 if (sp == 0) { 753 error = ENOSPC; 754 break; 755 } 756 if (notmapped) { 757 error = md_malloc_move_ma(&m, 758 &ma_offs, sc->sectorsize, 759 (void *)sp, 0, 760 MD_MALLOC_MOVE_WRITE); 761 } else if (vlist != NULL) { 762 error = md_malloc_move_vlist( 763 &vlist, &ma_offs, 764 sc->sectorsize, (void *)sp, 765 0, MD_MALLOC_MOVE_WRITE); 766 } else { 767 bcopy(dst, (void *)sp, 768 sc->sectorsize); 769 } 770 error = s_write(sc->indir, secno, sp); 771 } else { 772 if (notmapped) { 773 error = md_malloc_move_ma(&m, 774 &ma_offs, sc->sectorsize, 775 (void *)osp, 0, 776 MD_MALLOC_MOVE_WRITE); 777 } else if (vlist != NULL) { 778 error = md_malloc_move_vlist( 779 &vlist, &ma_offs, 780 sc->sectorsize, (void *)osp, 781 0, MD_MALLOC_MOVE_WRITE); 782 } else { 783 bcopy(dst, (void *)osp, 784 sc->sectorsize); 785 } 786 osp = 0; 787 } 788 } 789 } else { 790 error = EOPNOTSUPP; 791 } 792 if (osp > 255) 793 uma_zfree(sc->uma, (void*)osp); 794 if (error != 0) 795 break; 796 secno++; 797 if (!notmapped && vlist == NULL) 798 dst += sc->sectorsize; 799 } 800 bp->bio_resid = 0; 801 return (error); 802 } 803 804 static void 805 mdcopyto_vlist(void *src, bus_dma_segment_t *vlist, off_t offset, off_t len) 806 { 807 off_t seg_len; 808 809 while (offset >= vlist->ds_len) { 810 offset -= vlist->ds_len; 811 vlist++; 812 } 813 814 while (len != 0) { 815 seg_len = omin(len, vlist->ds_len - offset); 816 bcopy(src, (void *)(uintptr_t)(vlist->ds_addr + offset), 817 seg_len); 818 offset = 0; 819 src = (uint8_t *)src + seg_len; 820 len -= seg_len; 821 vlist++; 822 } 823 } 824 825 static void 826 mdcopyfrom_vlist(bus_dma_segment_t *vlist, off_t offset, void *dst, off_t len) 827 { 828 off_t seg_len; 829 830 while (offset >= vlist->ds_len) { 831 offset -= vlist->ds_len; 832 vlist++; 833 } 834 835 while (len != 0) { 836 seg_len = omin(len, vlist->ds_len - offset); 837 bcopy((void *)(uintptr_t)(vlist->ds_addr + offset), dst, 838 seg_len); 839 offset = 0; 840 dst = (uint8_t *)dst + seg_len; 841 len -= seg_len; 842 vlist++; 843 } 844 } 845 846 static int 847 mdstart_preload(struct md_s *sc, struct bio *bp) 848 { 849 uint8_t *p; 850 851 p = sc->pl_ptr + bp->bio_offset; 852 switch (bp->bio_cmd) { 853 case BIO_READ: 854 if ((bp->bio_flags & BIO_VLIST) != 0) { 855 mdcopyto_vlist(p, (bus_dma_segment_t *)bp->bio_data, 856 bp->bio_ma_offset, bp->bio_length); 857 } else { 858 bcopy(p, bp->bio_data, bp->bio_length); 859 } 860 cpu_flush_dcache(bp->bio_data, bp->bio_length); 861 break; 862 case BIO_WRITE: 863 if ((bp->bio_flags & BIO_VLIST) != 0) { 864 mdcopyfrom_vlist((bus_dma_segment_t *)bp->bio_data, 865 bp->bio_ma_offset, p, bp->bio_length); 866 } else { 867 bcopy(bp->bio_data, p, bp->bio_length); 868 } 869 break; 870 } 871 bp->bio_resid = 0; 872 return (0); 873 } 874 875 static int 876 mdstart_vnode(struct md_s *sc, struct bio *bp) 877 { 878 int error; 879 struct uio auio; 880 struct iovec aiov; 881 struct iovec *piov; 882 struct mount *mp; 883 struct vnode *vp; 884 bus_dma_segment_t *vlist; 885 struct thread *td; 886 off_t iolen, iostart, off, len; 887 int ma_offs, npages; 888 bool mapped; 889 890 switch (bp->bio_cmd) { 891 case BIO_READ: 892 auio.uio_rw = UIO_READ; 893 break; 894 case BIO_WRITE: 895 auio.uio_rw = UIO_WRITE; 896 break; 897 case BIO_FLUSH: 898 break; 899 case BIO_DELETE: 900 if (sc->candelete) 901 break; 902 /* FALLTHROUGH */ 903 default: 904 return (EOPNOTSUPP); 905 } 906 907 td = curthread; 908 vp = sc->vnode; 909 piov = NULL; 910 ma_offs = bp->bio_ma_offset; 911 off = bp->bio_offset; 912 len = bp->bio_length; 913 mapped = false; 914 915 /* 916 * VNODE I/O 917 * 918 * If an error occurs, we set BIO_ERROR but we do not set 919 * B_INVAL because (for a write anyway), the buffer is 920 * still valid. 921 */ 922 923 if (bp->bio_cmd == BIO_FLUSH) { 924 do { 925 (void)vn_start_write(vp, &mp, V_WAIT); 926 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 927 error = VOP_FSYNC(vp, MNT_WAIT, td); 928 VOP_UNLOCK(vp); 929 vn_finished_write(mp); 930 } while (error == ERELOOKUP); 931 return (error); 932 } else if (bp->bio_cmd == BIO_DELETE) { 933 error = vn_deallocate(vp, &off, &len, 0, 934 sc->flags & MD_ASYNC ? 0 : IO_SYNC, sc->cred, NOCRED); 935 bp->bio_resid = len; 936 return (error); 937 } 938 939 auio.uio_offset = (vm_ooffset_t)bp->bio_offset; 940 auio.uio_resid = bp->bio_length; 941 auio.uio_segflg = UIO_SYSSPACE; 942 auio.uio_td = td; 943 944 if ((bp->bio_flags & BIO_VLIST) != 0) { 945 piov = malloc(sizeof(*piov) * bp->bio_ma_n, M_MD, M_WAITOK); 946 auio.uio_iov = piov; 947 vlist = (bus_dma_segment_t *)bp->bio_data; 948 while (len > 0) { 949 piov->iov_base = (void *)(uintptr_t)(vlist->ds_addr + 950 ma_offs); 951 piov->iov_len = vlist->ds_len - ma_offs; 952 if (piov->iov_len > len) 953 piov->iov_len = len; 954 len -= piov->iov_len; 955 ma_offs = 0; 956 vlist++; 957 piov++; 958 } 959 auio.uio_iovcnt = piov - auio.uio_iov; 960 piov = auio.uio_iov; 961 } else if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 962 bp->bio_resid = len; 963 unmapped_step: 964 npages = atop(min(maxphys, round_page(len + (ma_offs & 965 PAGE_MASK)))); 966 iolen = min(ptoa(npages) - (ma_offs & PAGE_MASK), len); 967 KASSERT(iolen > 0, ("zero iolen")); 968 KASSERT(npages <= atop(MAXPHYS + PAGE_SIZE), 969 ("npages %d too large", npages)); 970 pmap_qenter(sc->kva, &bp->bio_ma[atop(ma_offs)], npages); 971 aiov.iov_base = (void *)(sc->kva + (ma_offs & PAGE_MASK)); 972 aiov.iov_len = iolen; 973 auio.uio_iov = &aiov; 974 auio.uio_iovcnt = 1; 975 auio.uio_resid = iolen; 976 mapped = true; 977 } else { 978 aiov.iov_base = bp->bio_data; 979 aiov.iov_len = bp->bio_length; 980 auio.uio_iov = &aiov; 981 auio.uio_iovcnt = 1; 982 } 983 iostart = auio.uio_offset; 984 if (auio.uio_rw == UIO_READ) { 985 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 986 error = VOP_READ(vp, &auio, 0, sc->cred); 987 VOP_UNLOCK(vp); 988 } else { 989 (void) vn_start_write(vp, &mp, V_WAIT); 990 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 991 error = VOP_WRITE(vp, &auio, sc->flags & MD_ASYNC ? 0 : IO_SYNC, 992 sc->cred); 993 VOP_UNLOCK(vp); 994 vn_finished_write(mp); 995 if (error == 0) 996 sc->flags &= ~MD_VERIFY; 997 } 998 999 /* When MD_CACHE is set, try to avoid double-caching the data. */ 1000 if (error == 0 && (sc->flags & MD_CACHE) == 0) 1001 VOP_ADVISE(vp, iostart, auio.uio_offset - 1, 1002 POSIX_FADV_DONTNEED); 1003 1004 if (mapped) { 1005 pmap_qremove(sc->kva, npages); 1006 if (error == 0) { 1007 len -= iolen; 1008 bp->bio_resid -= iolen; 1009 ma_offs += iolen; 1010 if (len > 0) 1011 goto unmapped_step; 1012 } 1013 } else { 1014 bp->bio_resid = auio.uio_resid; 1015 } 1016 1017 free(piov, M_MD); 1018 return (error); 1019 } 1020 1021 static int 1022 mdstart_swap(struct md_s *sc, struct bio *bp) 1023 { 1024 vm_page_t m; 1025 u_char *p; 1026 vm_pindex_t i, lastp; 1027 bus_dma_segment_t *vlist; 1028 int rv, ma_offs, offs, len, lastend; 1029 1030 switch (bp->bio_cmd) { 1031 case BIO_READ: 1032 case BIO_WRITE: 1033 case BIO_DELETE: 1034 break; 1035 case BIO_FLUSH: 1036 return (0); 1037 default: 1038 return (EOPNOTSUPP); 1039 } 1040 1041 p = bp->bio_data; 1042 ma_offs = (bp->bio_flags & (BIO_UNMAPPED|BIO_VLIST)) != 0 ? 1043 bp->bio_ma_offset : 0; 1044 vlist = (bp->bio_flags & BIO_VLIST) != 0 ? 1045 (bus_dma_segment_t *)bp->bio_data : NULL; 1046 1047 /* 1048 * offs is the offset at which to start operating on the 1049 * next (ie, first) page. lastp is the last page on 1050 * which we're going to operate. lastend is the ending 1051 * position within that last page (ie, PAGE_SIZE if 1052 * we're operating on complete aligned pages). 1053 */ 1054 offs = bp->bio_offset % PAGE_SIZE; 1055 lastp = (bp->bio_offset + bp->bio_length - 1) / PAGE_SIZE; 1056 lastend = (bp->bio_offset + bp->bio_length - 1) % PAGE_SIZE + 1; 1057 1058 rv = VM_PAGER_OK; 1059 vm_object_pip_add(sc->object, 1); 1060 for (i = bp->bio_offset / PAGE_SIZE; i <= lastp; i++) { 1061 len = ((i == lastp) ? lastend : PAGE_SIZE) - offs; 1062 m = vm_page_grab_unlocked(sc->object, i, VM_ALLOC_SYSTEM); 1063 if (bp->bio_cmd == BIO_READ) { 1064 if (vm_page_all_valid(m)) 1065 rv = VM_PAGER_OK; 1066 else 1067 rv = vm_pager_get_pages(sc->object, &m, 1, 1068 NULL, NULL); 1069 if (rv == VM_PAGER_ERROR) { 1070 VM_OBJECT_WLOCK(sc->object); 1071 vm_page_free(m); 1072 VM_OBJECT_WUNLOCK(sc->object); 1073 break; 1074 } else if (rv == VM_PAGER_FAIL) { 1075 /* 1076 * Pager does not have the page. Zero 1077 * the allocated page, and mark it as 1078 * valid. Do not set dirty, the page 1079 * can be recreated if thrown out. 1080 */ 1081 pmap_zero_page(m); 1082 vm_page_valid(m); 1083 } 1084 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 1085 pmap_copy_pages(&m, offs, bp->bio_ma, 1086 ma_offs, len); 1087 } else if ((bp->bio_flags & BIO_VLIST) != 0) { 1088 physcopyout_vlist(VM_PAGE_TO_PHYS(m) + offs, 1089 vlist, ma_offs, len); 1090 cpu_flush_dcache(p, len); 1091 } else { 1092 physcopyout(VM_PAGE_TO_PHYS(m) + offs, p, len); 1093 cpu_flush_dcache(p, len); 1094 } 1095 } else if (bp->bio_cmd == BIO_WRITE) { 1096 if (len == PAGE_SIZE || vm_page_all_valid(m)) 1097 rv = VM_PAGER_OK; 1098 else 1099 rv = vm_pager_get_pages(sc->object, &m, 1, 1100 NULL, NULL); 1101 if (rv == VM_PAGER_ERROR) { 1102 VM_OBJECT_WLOCK(sc->object); 1103 vm_page_free(m); 1104 VM_OBJECT_WUNLOCK(sc->object); 1105 break; 1106 } else if (rv == VM_PAGER_FAIL) 1107 pmap_zero_page(m); 1108 1109 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 1110 pmap_copy_pages(bp->bio_ma, ma_offs, &m, 1111 offs, len); 1112 } else if ((bp->bio_flags & BIO_VLIST) != 0) { 1113 physcopyin_vlist(vlist, ma_offs, 1114 VM_PAGE_TO_PHYS(m) + offs, len); 1115 } else { 1116 physcopyin(p, VM_PAGE_TO_PHYS(m) + offs, len); 1117 } 1118 1119 vm_page_valid(m); 1120 vm_page_set_dirty(m); 1121 } else if (bp->bio_cmd == BIO_DELETE) { 1122 if (len == PAGE_SIZE || vm_page_all_valid(m)) 1123 rv = VM_PAGER_OK; 1124 else 1125 rv = vm_pager_get_pages(sc->object, &m, 1, 1126 NULL, NULL); 1127 VM_OBJECT_WLOCK(sc->object); 1128 if (rv == VM_PAGER_ERROR) { 1129 vm_page_free(m); 1130 VM_OBJECT_WUNLOCK(sc->object); 1131 break; 1132 } else if (rv == VM_PAGER_FAIL) { 1133 vm_page_free(m); 1134 m = NULL; 1135 } else { 1136 /* Page is valid. */ 1137 if (len != PAGE_SIZE) { 1138 pmap_zero_page_area(m, offs, len); 1139 vm_page_set_dirty(m); 1140 } else { 1141 vm_pager_page_unswapped(m); 1142 vm_page_free(m); 1143 m = NULL; 1144 } 1145 } 1146 VM_OBJECT_WUNLOCK(sc->object); 1147 } 1148 if (m != NULL) { 1149 /* 1150 * The page may be deactivated prior to setting 1151 * PGA_REFERENCED, but in this case it will be 1152 * reactivated by the page daemon. 1153 */ 1154 if (vm_page_active(m)) 1155 vm_page_reference(m); 1156 else 1157 vm_page_activate(m); 1158 vm_page_xunbusy(m); 1159 } 1160 1161 /* Actions on further pages start at offset 0 */ 1162 p += PAGE_SIZE - offs; 1163 offs = 0; 1164 ma_offs += len; 1165 } 1166 vm_object_pip_wakeup(sc->object); 1167 return (rv != VM_PAGER_ERROR ? 0 : ENOSPC); 1168 } 1169 1170 static int 1171 mdstart_null(struct md_s *sc, struct bio *bp) 1172 { 1173 1174 switch (bp->bio_cmd) { 1175 case BIO_READ: 1176 bzero(bp->bio_data, bp->bio_length); 1177 cpu_flush_dcache(bp->bio_data, bp->bio_length); 1178 break; 1179 case BIO_WRITE: 1180 break; 1181 } 1182 bp->bio_resid = 0; 1183 return (0); 1184 } 1185 1186 static void 1187 md_handleattr(struct md_s *sc, struct bio *bp) 1188 { 1189 if (sc->fwsectors && sc->fwheads && 1190 (g_handleattr_int(bp, "GEOM::fwsectors", sc->fwsectors) != 0 || 1191 g_handleattr_int(bp, "GEOM::fwheads", sc->fwheads) != 0)) 1192 return; 1193 if (g_handleattr_int(bp, "GEOM::candelete", sc->candelete) != 0) 1194 return; 1195 if (sc->ident[0] != '\0' && 1196 g_handleattr_str(bp, "GEOM::ident", sc->ident) != 0) 1197 return; 1198 if (g_handleattr_int(bp, "MNT::verified", (sc->flags & MD_VERIFY) != 0)) 1199 return; 1200 g_io_deliver(bp, EOPNOTSUPP); 1201 } 1202 1203 static void 1204 md_kthread(void *arg) 1205 { 1206 struct md_s *sc; 1207 struct bio *bp; 1208 int error; 1209 1210 sc = arg; 1211 thread_lock(curthread); 1212 sched_prio(curthread, PRIBIO); 1213 thread_unlock(curthread); 1214 if (sc->type == MD_VNODE) 1215 curthread->td_pflags |= TDP_NORUNNINGBUF; 1216 1217 for (;;) { 1218 mtx_lock(&sc->queue_mtx); 1219 if (sc->flags & MD_SHUTDOWN) { 1220 sc->flags |= MD_EXITING; 1221 mtx_unlock(&sc->queue_mtx); 1222 kproc_exit(0); 1223 } 1224 bp = bioq_takefirst(&sc->bio_queue); 1225 if (!bp) { 1226 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 1227 continue; 1228 } 1229 mtx_unlock(&sc->queue_mtx); 1230 if (bp->bio_cmd == BIO_GETATTR) { 1231 md_handleattr(sc, bp); 1232 } else { 1233 error = sc->start(sc, bp); 1234 if (bp->bio_cmd == BIO_READ || bp->bio_cmd == BIO_WRITE) { 1235 /* 1236 * Devstat uses (bio_bcount, bio_resid) for 1237 * determining the length of the completed part 1238 * of the i/o. g_io_deliver() will translate 1239 * from bio_completed to that, but it also 1240 * destroys the bio so we must do our own 1241 * translation. 1242 */ 1243 bp->bio_bcount = bp->bio_length; 1244 devstat_end_transaction_bio(sc->devstat, bp); 1245 } 1246 bp->bio_completed = bp->bio_length - bp->bio_resid; 1247 g_io_deliver(bp, error); 1248 } 1249 } 1250 } 1251 1252 static struct md_s * 1253 mdfind(int unit) 1254 { 1255 struct md_s *sc; 1256 1257 LIST_FOREACH(sc, &md_softc_list, list) { 1258 if (sc->unit == unit) 1259 break; 1260 } 1261 return (sc); 1262 } 1263 1264 static struct md_s * 1265 mdnew(int unit, int *errp, enum md_types type) 1266 { 1267 struct md_s *sc; 1268 int error; 1269 1270 *errp = 0; 1271 if (unit == -1) 1272 unit = alloc_unr(md_uh); 1273 else 1274 unit = alloc_unr_specific(md_uh, unit); 1275 1276 if (unit == -1) { 1277 *errp = EBUSY; 1278 return (NULL); 1279 } 1280 1281 sc = malloc(sizeof(*sc), M_MD, M_WAITOK | M_ZERO); 1282 sc->type = type; 1283 bioq_init(&sc->bio_queue); 1284 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 1285 sc->unit = unit; 1286 sprintf(sc->name, "md%d", unit); 1287 LIST_INSERT_HEAD(&md_softc_list, sc, list); 1288 error = kproc_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 1289 if (error == 0) 1290 return (sc); 1291 LIST_REMOVE(sc, list); 1292 mtx_destroy(&sc->queue_mtx); 1293 free_unr(md_uh, sc->unit); 1294 free(sc, M_MD); 1295 *errp = error; 1296 return (NULL); 1297 } 1298 1299 static void 1300 mdinit(struct md_s *sc) 1301 { 1302 struct g_geom *gp; 1303 struct g_provider *pp; 1304 1305 g_topology_lock(); 1306 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 1307 gp->softc = sc; 1308 pp = g_new_providerf(gp, "md%d", sc->unit); 1309 devstat_remove_entry(pp->stat); 1310 pp->stat = NULL; 1311 pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE; 1312 pp->mediasize = sc->mediasize; 1313 pp->sectorsize = sc->sectorsize; 1314 switch (sc->type) { 1315 case MD_MALLOC: 1316 case MD_VNODE: 1317 case MD_SWAP: 1318 pp->flags |= G_PF_ACCEPT_UNMAPPED; 1319 break; 1320 case MD_PRELOAD: 1321 case MD_NULL: 1322 break; 1323 } 1324 sc->gp = gp; 1325 sc->pp = pp; 1326 sc->devstat = devstat_new_entry("md", sc->unit, sc->sectorsize, 1327 DEVSTAT_ALL_SUPPORTED, DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 1328 sc->devstat->id = pp; 1329 g_error_provider(pp, 0); 1330 g_topology_unlock(); 1331 } 1332 1333 static int 1334 mdcreate_malloc(struct md_s *sc, struct md_req *mdr) 1335 { 1336 uintptr_t sp; 1337 int error; 1338 off_t u; 1339 1340 error = 0; 1341 if (mdr->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 1342 return (EINVAL); 1343 if (mdr->md_sectorsize != 0 && !powerof2(mdr->md_sectorsize)) 1344 return (EINVAL); 1345 /* Compression doesn't make sense if we have reserved space */ 1346 if (mdr->md_options & MD_RESERVE) 1347 mdr->md_options &= ~MD_COMPRESS; 1348 if (mdr->md_fwsectors != 0) 1349 sc->fwsectors = mdr->md_fwsectors; 1350 if (mdr->md_fwheads != 0) 1351 sc->fwheads = mdr->md_fwheads; 1352 sc->flags = mdr->md_options & (MD_COMPRESS | MD_FORCE); 1353 sc->indir = dimension(sc->mediasize / sc->sectorsize); 1354 sc->uma = uma_zcreate(sc->name, sc->sectorsize, NULL, NULL, NULL, NULL, 1355 0x1ff, 0); 1356 if (mdr->md_options & MD_RESERVE) { 1357 off_t nsectors; 1358 1359 nsectors = sc->mediasize / sc->sectorsize; 1360 for (u = 0; u < nsectors; u++) { 1361 sp = (uintptr_t)uma_zalloc(sc->uma, (md_malloc_wait ? 1362 M_WAITOK : M_NOWAIT) | M_ZERO); 1363 if (sp != 0) 1364 error = s_write(sc->indir, u, sp); 1365 else 1366 error = ENOMEM; 1367 if (error != 0) 1368 break; 1369 } 1370 } 1371 return (error); 1372 } 1373 1374 static int 1375 mdsetcred(struct md_s *sc, struct ucred *cred) 1376 { 1377 char *tmpbuf; 1378 int error = 0; 1379 1380 /* 1381 * Set credits in our softc 1382 */ 1383 1384 if (sc->cred) 1385 crfree(sc->cred); 1386 sc->cred = crhold(cred); 1387 1388 /* 1389 * Horrible kludge to establish credentials for NFS XXX. 1390 */ 1391 1392 if (sc->vnode) { 1393 struct uio auio; 1394 struct iovec aiov; 1395 1396 tmpbuf = malloc(sc->sectorsize, M_TEMP, M_WAITOK); 1397 bzero(&auio, sizeof(auio)); 1398 1399 aiov.iov_base = tmpbuf; 1400 aiov.iov_len = sc->sectorsize; 1401 auio.uio_iov = &aiov; 1402 auio.uio_iovcnt = 1; 1403 auio.uio_offset = 0; 1404 auio.uio_rw = UIO_READ; 1405 auio.uio_segflg = UIO_SYSSPACE; 1406 auio.uio_resid = aiov.iov_len; 1407 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY); 1408 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 1409 VOP_UNLOCK(sc->vnode); 1410 free(tmpbuf, M_TEMP); 1411 } 1412 return (error); 1413 } 1414 1415 static int 1416 mdcreate_vnode(struct md_s *sc, struct md_req *mdr, struct thread *td) 1417 { 1418 struct vattr vattr; 1419 struct nameidata nd; 1420 char *fname; 1421 int error, flags; 1422 long v; 1423 1424 fname = mdr->md_file; 1425 if (mdr->md_file_seg == UIO_USERSPACE) { 1426 error = copyinstr(fname, sc->file, sizeof(sc->file), NULL); 1427 if (error != 0) 1428 return (error); 1429 } else if (mdr->md_file_seg == UIO_SYSSPACE) 1430 strlcpy(sc->file, fname, sizeof(sc->file)); 1431 else 1432 return (EDOOFUS); 1433 1434 /* 1435 * If the user specified that this is a read only device, don't 1436 * set the FWRITE mask before trying to open the backing store. 1437 */ 1438 flags = FREAD | ((mdr->md_options & MD_READONLY) ? 0 : FWRITE) \ 1439 | ((mdr->md_options & MD_VERIFY) ? O_VERIFY : 0); 1440 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, sc->file); 1441 error = vn_open(&nd, &flags, 0, NULL); 1442 if (error != 0) 1443 return (error); 1444 NDFREE_PNBUF(&nd); 1445 if (nd.ni_vp->v_type != VREG) { 1446 error = EINVAL; 1447 goto bad; 1448 } 1449 error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred); 1450 if (error != 0) 1451 goto bad; 1452 if ((mdr->md_options & MD_MUSTDEALLOC) != 0) { 1453 error = VOP_PATHCONF(nd.ni_vp, _PC_DEALLOC_PRESENT, &v); 1454 if (error != 0) 1455 goto bad; 1456 if (v == 0) 1457 sc->candelete = false; 1458 } 1459 if (VOP_ISLOCKED(nd.ni_vp) != LK_EXCLUSIVE) { 1460 vn_lock(nd.ni_vp, LK_UPGRADE | LK_RETRY); 1461 if (VN_IS_DOOMED(nd.ni_vp)) { 1462 /* Forced unmount. */ 1463 error = EBADF; 1464 goto bad; 1465 } 1466 } 1467 nd.ni_vp->v_vflag |= VV_MD; 1468 VOP_UNLOCK(nd.ni_vp); 1469 1470 if (mdr->md_fwsectors != 0) 1471 sc->fwsectors = mdr->md_fwsectors; 1472 if (mdr->md_fwheads != 0) 1473 sc->fwheads = mdr->md_fwheads; 1474 snprintf(sc->ident, sizeof(sc->ident), "MD-DEV%ju-INO%ju", 1475 (uintmax_t)vattr.va_fsid, (uintmax_t)vattr.va_fileid); 1476 sc->flags = mdr->md_options & (MD_ASYNC | MD_CACHE | MD_FORCE | 1477 MD_VERIFY); 1478 if (!(flags & FWRITE)) 1479 sc->flags |= MD_READONLY; 1480 sc->vnode = nd.ni_vp; 1481 1482 error = mdsetcred(sc, td->td_ucred); 1483 if (error != 0) { 1484 sc->vnode = NULL; 1485 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY); 1486 nd.ni_vp->v_vflag &= ~VV_MD; 1487 goto bad; 1488 } 1489 1490 sc->kva = kva_alloc(MAXPHYS + PAGE_SIZE); 1491 return (0); 1492 bad: 1493 VOP_UNLOCK(nd.ni_vp); 1494 (void)vn_close(nd.ni_vp, flags, td->td_ucred, td); 1495 return (error); 1496 } 1497 1498 static void 1499 g_md_providergone(struct g_provider *pp) 1500 { 1501 struct md_s *sc = pp->geom->softc; 1502 1503 mtx_lock(&sc->queue_mtx); 1504 sc->flags |= MD_PROVIDERGONE; 1505 wakeup(&sc->flags); 1506 mtx_unlock(&sc->queue_mtx); 1507 } 1508 1509 static int 1510 mddestroy(struct md_s *sc, struct thread *td) 1511 { 1512 1513 if (sc->gp) { 1514 g_topology_lock(); 1515 g_wither_geom(sc->gp, ENXIO); 1516 g_topology_unlock(); 1517 1518 mtx_lock(&sc->queue_mtx); 1519 while (!(sc->flags & MD_PROVIDERGONE)) 1520 msleep(&sc->flags, &sc->queue_mtx, PRIBIO, "mddestroy", 0); 1521 mtx_unlock(&sc->queue_mtx); 1522 } 1523 if (sc->devstat) { 1524 devstat_remove_entry(sc->devstat); 1525 sc->devstat = NULL; 1526 } 1527 mtx_lock(&sc->queue_mtx); 1528 sc->flags |= MD_SHUTDOWN; 1529 wakeup(sc); 1530 while (!(sc->flags & MD_EXITING)) 1531 msleep(sc->procp, &sc->queue_mtx, PRIBIO, "mddestroy", hz / 10); 1532 mtx_unlock(&sc->queue_mtx); 1533 mtx_destroy(&sc->queue_mtx); 1534 if (sc->vnode != NULL) { 1535 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY); 1536 sc->vnode->v_vflag &= ~VV_MD; 1537 VOP_UNLOCK(sc->vnode); 1538 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 1539 FREAD : (FREAD|FWRITE), sc->cred, td); 1540 } 1541 if (sc->cred != NULL) 1542 crfree(sc->cred); 1543 if (sc->object != NULL) 1544 vm_object_deallocate(sc->object); 1545 if (sc->indir) 1546 destroy_indir(sc, sc->indir); 1547 if (sc->uma) 1548 uma_zdestroy(sc->uma); 1549 if (sc->kva) 1550 kva_free(sc->kva, MAXPHYS + PAGE_SIZE); 1551 1552 LIST_REMOVE(sc, list); 1553 free_unr(md_uh, sc->unit); 1554 free(sc, M_MD); 1555 return (0); 1556 } 1557 1558 static int 1559 mdresize(struct md_s *sc, struct md_req *mdr) 1560 { 1561 int error, res; 1562 vm_pindex_t oldpages, newpages; 1563 1564 switch (sc->type) { 1565 case MD_VNODE: 1566 case MD_NULL: 1567 break; 1568 case MD_SWAP: 1569 if (mdr->md_mediasize <= 0 || 1570 (mdr->md_mediasize % PAGE_SIZE) != 0) 1571 return (EDOM); 1572 oldpages = OFF_TO_IDX(sc->mediasize); 1573 newpages = OFF_TO_IDX(mdr->md_mediasize); 1574 if (newpages < oldpages) { 1575 VM_OBJECT_WLOCK(sc->object); 1576 vm_object_page_remove(sc->object, newpages, 0, 0); 1577 swap_release_by_cred(IDX_TO_OFF(oldpages - 1578 newpages), sc->cred); 1579 sc->object->charge = IDX_TO_OFF(newpages); 1580 sc->object->size = newpages; 1581 VM_OBJECT_WUNLOCK(sc->object); 1582 } else if (newpages > oldpages) { 1583 res = swap_reserve_by_cred(IDX_TO_OFF(newpages - 1584 oldpages), sc->cred); 1585 if (!res) 1586 return (ENOMEM); 1587 if ((mdr->md_options & MD_RESERVE) || 1588 (sc->flags & MD_RESERVE)) { 1589 error = swap_pager_reserve(sc->object, 1590 oldpages, newpages - oldpages); 1591 if (error < 0) { 1592 swap_release_by_cred( 1593 IDX_TO_OFF(newpages - oldpages), 1594 sc->cred); 1595 return (EDOM); 1596 } 1597 } 1598 VM_OBJECT_WLOCK(sc->object); 1599 sc->object->charge = IDX_TO_OFF(newpages); 1600 sc->object->size = newpages; 1601 VM_OBJECT_WUNLOCK(sc->object); 1602 } 1603 break; 1604 default: 1605 return (EOPNOTSUPP); 1606 } 1607 1608 sc->mediasize = mdr->md_mediasize; 1609 1610 g_topology_lock(); 1611 g_resize_provider(sc->pp, sc->mediasize); 1612 g_topology_unlock(); 1613 return (0); 1614 } 1615 1616 static int 1617 mdcreate_swap(struct md_s *sc, struct md_req *mdr, struct thread *td) 1618 { 1619 vm_ooffset_t npage; 1620 int error; 1621 1622 /* 1623 * Range check. Disallow negative sizes and sizes not being 1624 * multiple of page size. 1625 */ 1626 if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0) 1627 return (EDOM); 1628 1629 /* 1630 * Allocate an OBJT_SWAP object. 1631 * 1632 * Note the truncation. 1633 */ 1634 1635 if ((mdr->md_options & MD_VERIFY) != 0) 1636 return (EINVAL); 1637 npage = mdr->md_mediasize / PAGE_SIZE; 1638 if (mdr->md_fwsectors != 0) 1639 sc->fwsectors = mdr->md_fwsectors; 1640 if (mdr->md_fwheads != 0) 1641 sc->fwheads = mdr->md_fwheads; 1642 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * npage, 1643 VM_PROT_DEFAULT, 0, td->td_ucred); 1644 if (sc->object == NULL) 1645 return (ENOMEM); 1646 sc->flags = mdr->md_options & (MD_FORCE | MD_RESERVE); 1647 if (mdr->md_options & MD_RESERVE) { 1648 if (swap_pager_reserve(sc->object, 0, npage) < 0) { 1649 error = EDOM; 1650 goto finish; 1651 } 1652 } 1653 error = mdsetcred(sc, td->td_ucred); 1654 finish: 1655 if (error != 0) { 1656 vm_object_deallocate(sc->object); 1657 sc->object = NULL; 1658 } 1659 return (error); 1660 } 1661 1662 static int 1663 mdcreate_null(struct md_s *sc, struct md_req *mdr, struct thread *td) 1664 { 1665 1666 /* 1667 * Range check. Disallow negative sizes and sizes not being 1668 * multiple of page size. 1669 */ 1670 if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0) 1671 return (EDOM); 1672 1673 return (0); 1674 } 1675 1676 static int 1677 kern_mdattach_locked(struct thread *td, struct md_req *mdr) 1678 { 1679 struct md_s *sc; 1680 unsigned sectsize; 1681 int error, i; 1682 1683 sx_assert(&md_sx, SA_XLOCKED); 1684 1685 switch (mdr->md_type) { 1686 case MD_MALLOC: 1687 case MD_PRELOAD: 1688 case MD_VNODE: 1689 case MD_SWAP: 1690 case MD_NULL: 1691 break; 1692 default: 1693 return (EINVAL); 1694 } 1695 if (mdr->md_sectorsize == 0) 1696 sectsize = DEV_BSIZE; 1697 else 1698 sectsize = mdr->md_sectorsize; 1699 if (sectsize > maxphys || mdr->md_mediasize < sectsize) 1700 return (EINVAL); 1701 if (mdr->md_options & MD_AUTOUNIT) 1702 sc = mdnew(-1, &error, mdr->md_type); 1703 else { 1704 if (mdr->md_unit > INT_MAX) 1705 return (EINVAL); 1706 sc = mdnew(mdr->md_unit, &error, mdr->md_type); 1707 } 1708 if (sc == NULL) 1709 return (error); 1710 if (mdr->md_label != NULL) 1711 error = copyinstr(mdr->md_label, sc->label, 1712 sizeof(sc->label), NULL); 1713 if (error != 0) 1714 goto err_after_new; 1715 if (mdr->md_options & MD_AUTOUNIT) 1716 mdr->md_unit = sc->unit; 1717 sc->mediasize = mdr->md_mediasize; 1718 sc->sectorsize = sectsize; 1719 sc->candelete = true; 1720 error = EDOOFUS; 1721 switch (sc->type) { 1722 case MD_MALLOC: 1723 sc->start = mdstart_malloc; 1724 error = mdcreate_malloc(sc, mdr); 1725 break; 1726 case MD_PRELOAD: 1727 /* 1728 * We disallow attaching preloaded memory disks via 1729 * ioctl. Preloaded memory disks are automatically 1730 * attached in g_md_init(). 1731 */ 1732 error = EOPNOTSUPP; 1733 break; 1734 case MD_VNODE: 1735 sc->start = mdstart_vnode; 1736 error = mdcreate_vnode(sc, mdr, td); 1737 break; 1738 case MD_SWAP: 1739 sc->start = mdstart_swap; 1740 error = mdcreate_swap(sc, mdr, td); 1741 break; 1742 case MD_NULL: 1743 sc->start = mdstart_null; 1744 error = mdcreate_null(sc, mdr, td); 1745 break; 1746 } 1747 err_after_new: 1748 if (error != 0) { 1749 mddestroy(sc, td); 1750 return (error); 1751 } 1752 1753 /* Prune off any residual fractional sector */ 1754 i = sc->mediasize % sc->sectorsize; 1755 sc->mediasize -= i; 1756 1757 mdinit(sc); 1758 return (0); 1759 } 1760 1761 static int 1762 kern_mdattach(struct thread *td, struct md_req *mdr) 1763 { 1764 int error; 1765 1766 sx_xlock(&md_sx); 1767 error = kern_mdattach_locked(td, mdr); 1768 sx_xunlock(&md_sx); 1769 return (error); 1770 } 1771 1772 static int 1773 kern_mddetach_locked(struct thread *td, struct md_req *mdr) 1774 { 1775 struct md_s *sc; 1776 1777 sx_assert(&md_sx, SA_XLOCKED); 1778 1779 if (mdr->md_mediasize != 0 || 1780 (mdr->md_options & ~MD_FORCE) != 0) 1781 return (EINVAL); 1782 1783 sc = mdfind(mdr->md_unit); 1784 if (sc == NULL) 1785 return (ENOENT); 1786 if (sc->opencount != 0 && !(sc->flags & MD_FORCE) && 1787 !(mdr->md_options & MD_FORCE)) 1788 return (EBUSY); 1789 return (mddestroy(sc, td)); 1790 } 1791 1792 static int 1793 kern_mddetach(struct thread *td, struct md_req *mdr) 1794 { 1795 int error; 1796 1797 sx_xlock(&md_sx); 1798 error = kern_mddetach_locked(td, mdr); 1799 sx_xunlock(&md_sx); 1800 return (error); 1801 } 1802 1803 static int 1804 kern_mdresize_locked(struct md_req *mdr) 1805 { 1806 struct md_s *sc; 1807 1808 sx_assert(&md_sx, SA_XLOCKED); 1809 1810 if ((mdr->md_options & ~(MD_FORCE | MD_RESERVE)) != 0) 1811 return (EINVAL); 1812 1813 sc = mdfind(mdr->md_unit); 1814 if (sc == NULL) 1815 return (ENOENT); 1816 if (mdr->md_mediasize < sc->sectorsize) 1817 return (EINVAL); 1818 mdr->md_mediasize -= mdr->md_mediasize % sc->sectorsize; 1819 if (mdr->md_mediasize < sc->mediasize && 1820 !(sc->flags & MD_FORCE) && 1821 !(mdr->md_options & MD_FORCE)) 1822 return (EBUSY); 1823 return (mdresize(sc, mdr)); 1824 } 1825 1826 static int 1827 kern_mdresize(struct md_req *mdr) 1828 { 1829 int error; 1830 1831 sx_xlock(&md_sx); 1832 error = kern_mdresize_locked(mdr); 1833 sx_xunlock(&md_sx); 1834 return (error); 1835 } 1836 1837 static int 1838 kern_mdquery_locked(struct md_req *mdr) 1839 { 1840 struct md_s *sc; 1841 int error; 1842 1843 sx_assert(&md_sx, SA_XLOCKED); 1844 1845 sc = mdfind(mdr->md_unit); 1846 if (sc == NULL) 1847 return (ENOENT); 1848 mdr->md_type = sc->type; 1849 mdr->md_options = sc->flags; 1850 mdr->md_mediasize = sc->mediasize; 1851 mdr->md_sectorsize = sc->sectorsize; 1852 error = 0; 1853 if (mdr->md_label != NULL) { 1854 error = copyout(sc->label, mdr->md_label, 1855 strlen(sc->label) + 1); 1856 if (error != 0) 1857 return (error); 1858 } 1859 if (sc->type == MD_VNODE || 1860 (sc->type == MD_PRELOAD && mdr->md_file != NULL)) 1861 error = copyout(sc->file, mdr->md_file, 1862 strlen(sc->file) + 1); 1863 return (error); 1864 } 1865 1866 static int 1867 kern_mdquery(struct md_req *mdr) 1868 { 1869 int error; 1870 1871 sx_xlock(&md_sx); 1872 error = kern_mdquery_locked(mdr); 1873 sx_xunlock(&md_sx); 1874 return (error); 1875 } 1876 1877 /* Copy members that are not userspace pointers. */ 1878 #define MD_IOCTL2REQ(mdio, mdr) do { \ 1879 (mdr)->md_unit = (mdio)->md_unit; \ 1880 (mdr)->md_type = (mdio)->md_type; \ 1881 (mdr)->md_mediasize = (mdio)->md_mediasize; \ 1882 (mdr)->md_sectorsize = (mdio)->md_sectorsize; \ 1883 (mdr)->md_options = (mdio)->md_options; \ 1884 (mdr)->md_fwheads = (mdio)->md_fwheads; \ 1885 (mdr)->md_fwsectors = (mdio)->md_fwsectors; \ 1886 (mdr)->md_units = &(mdio)->md_pad[0]; \ 1887 (mdr)->md_units_nitems = nitems((mdio)->md_pad); \ 1888 } while(0) 1889 1890 /* Copy members that might have been updated */ 1891 #define MD_REQ2IOCTL(mdr, mdio) do { \ 1892 (mdio)->md_unit = (mdr)->md_unit; \ 1893 (mdio)->md_type = (mdr)->md_type; \ 1894 (mdio)->md_mediasize = (mdr)->md_mediasize; \ 1895 (mdio)->md_sectorsize = (mdr)->md_sectorsize; \ 1896 (mdio)->md_options = (mdr)->md_options; \ 1897 (mdio)->md_fwheads = (mdr)->md_fwheads; \ 1898 (mdio)->md_fwsectors = (mdr)->md_fwsectors; \ 1899 } while(0) 1900 1901 static int 1902 mdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, 1903 struct thread *td) 1904 { 1905 struct md_req mdr; 1906 int error; 1907 1908 if (md_debug) 1909 printf("mdctlioctl(%s %lx %p %x %p)\n", 1910 devtoname(dev), cmd, addr, flags, td); 1911 1912 bzero(&mdr, sizeof(mdr)); 1913 switch (cmd) { 1914 case MDIOCATTACH: 1915 case MDIOCDETACH: 1916 case MDIOCRESIZE: 1917 case MDIOCQUERY: { 1918 struct md_ioctl *mdio = (struct md_ioctl *)addr; 1919 if (mdio->md_version != MDIOVERSION) 1920 return (EINVAL); 1921 MD_IOCTL2REQ(mdio, &mdr); 1922 mdr.md_file = mdio->md_file; 1923 mdr.md_file_seg = UIO_USERSPACE; 1924 /* If the file is adjacent to the md_ioctl it's in kernel. */ 1925 if ((void *)mdio->md_file == (void *)(mdio + 1)) 1926 mdr.md_file_seg = UIO_SYSSPACE; 1927 mdr.md_label = mdio->md_label; 1928 break; 1929 } 1930 #ifdef COMPAT_FREEBSD32 1931 case MDIOCATTACH_32: 1932 case MDIOCDETACH_32: 1933 case MDIOCRESIZE_32: 1934 case MDIOCQUERY_32: { 1935 struct md_ioctl32 *mdio = (struct md_ioctl32 *)addr; 1936 if (mdio->md_version != MDIOVERSION) 1937 return (EINVAL); 1938 MD_IOCTL2REQ(mdio, &mdr); 1939 mdr.md_file = (void *)(uintptr_t)mdio->md_file; 1940 mdr.md_file_seg = UIO_USERSPACE; 1941 mdr.md_label = (void *)(uintptr_t)mdio->md_label; 1942 break; 1943 } 1944 #endif 1945 default: 1946 /* Fall through to handler switch. */ 1947 break; 1948 } 1949 1950 error = 0; 1951 switch (cmd) { 1952 case MDIOCATTACH: 1953 #ifdef COMPAT_FREEBSD32 1954 case MDIOCATTACH_32: 1955 #endif 1956 error = kern_mdattach(td, &mdr); 1957 break; 1958 case MDIOCDETACH: 1959 #ifdef COMPAT_FREEBSD32 1960 case MDIOCDETACH_32: 1961 #endif 1962 error = kern_mddetach(td, &mdr); 1963 break; 1964 case MDIOCRESIZE: 1965 #ifdef COMPAT_FREEBSD32 1966 case MDIOCRESIZE_32: 1967 #endif 1968 error = kern_mdresize(&mdr); 1969 break; 1970 case MDIOCQUERY: 1971 #ifdef COMPAT_FREEBSD32 1972 case MDIOCQUERY_32: 1973 #endif 1974 error = kern_mdquery(&mdr); 1975 break; 1976 default: 1977 error = ENOIOCTL; 1978 } 1979 1980 switch (cmd) { 1981 case MDIOCATTACH: 1982 case MDIOCQUERY: { 1983 struct md_ioctl *mdio = (struct md_ioctl *)addr; 1984 MD_REQ2IOCTL(&mdr, mdio); 1985 break; 1986 } 1987 #ifdef COMPAT_FREEBSD32 1988 case MDIOCATTACH_32: 1989 case MDIOCQUERY_32: { 1990 struct md_ioctl32 *mdio = (struct md_ioctl32 *)addr; 1991 MD_REQ2IOCTL(&mdr, mdio); 1992 break; 1993 } 1994 #endif 1995 default: 1996 /* Other commands to not alter mdr. */ 1997 break; 1998 } 1999 2000 return (error); 2001 } 2002 2003 static void 2004 md_preloaded(u_char *image, size_t length, const char *name) 2005 { 2006 struct md_s *sc; 2007 int error; 2008 2009 sc = mdnew(-1, &error, MD_PRELOAD); 2010 if (sc == NULL) 2011 return; 2012 sc->mediasize = length; 2013 sc->sectorsize = DEV_BSIZE; 2014 sc->pl_ptr = image; 2015 sc->pl_len = length; 2016 sc->start = mdstart_preload; 2017 if (name != NULL) 2018 strlcpy(sc->file, name, sizeof(sc->file)); 2019 #ifdef MD_ROOT 2020 if (sc->unit == 0) { 2021 #ifndef ROOTDEVNAME 2022 rootdevnames[0] = MD_ROOT_FSTYPE ":/dev/md0"; 2023 #endif 2024 #ifdef MD_ROOT_READONLY 2025 sc->flags |= MD_READONLY; 2026 #endif 2027 } 2028 #endif 2029 mdinit(sc); 2030 if (name != NULL) { 2031 printf("%s%d: Preloaded image <%s> %zd bytes at %p\n", 2032 MD_NAME, sc->unit, name, length, image); 2033 } else { 2034 printf("%s%d: Embedded image %zd bytes at %p\n", 2035 MD_NAME, sc->unit, length, image); 2036 } 2037 } 2038 2039 static void 2040 g_md_init(struct g_class *mp __unused) 2041 { 2042 caddr_t mod; 2043 u_char *ptr, *name, *type; 2044 unsigned len; 2045 int i; 2046 2047 /* figure out log2(NINDIR) */ 2048 for (i = NINDIR, nshift = -1; i; nshift++) 2049 i >>= 1; 2050 2051 mod = NULL; 2052 sx_init(&md_sx, "MD config lock"); 2053 g_topology_unlock(); 2054 md_uh = new_unrhdr(0, INT_MAX, NULL); 2055 #ifdef MD_ROOT 2056 if (mfs_root_size != 0) { 2057 sx_xlock(&md_sx); 2058 #ifdef MD_ROOT_MEM 2059 md_preloaded(mfs_root, mfs_root_size, NULL); 2060 #else 2061 md_preloaded(__DEVOLATILE(u_char *, &mfs_root), mfs_root_size, 2062 NULL); 2063 #endif 2064 sx_xunlock(&md_sx); 2065 } 2066 #endif 2067 /* XXX: are preload_* static or do they need Giant ? */ 2068 while ((mod = preload_search_next_name(mod)) != NULL) { 2069 name = (char *)preload_search_info(mod, MODINFO_NAME); 2070 if (name == NULL) 2071 continue; 2072 type = (char *)preload_search_info(mod, MODINFO_TYPE); 2073 if (type == NULL) 2074 continue; 2075 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 2076 continue; 2077 ptr = preload_fetch_addr(mod); 2078 len = preload_fetch_size(mod); 2079 if (ptr != NULL && len != 0) { 2080 sx_xlock(&md_sx); 2081 md_preloaded(ptr, len, name); 2082 sx_xunlock(&md_sx); 2083 } 2084 } 2085 status_dev = make_dev(&mdctl_cdevsw, INT_MAX, UID_ROOT, GID_WHEEL, 2086 0600, MDCTL_NAME); 2087 g_topology_lock(); 2088 } 2089 2090 static void 2091 g_md_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 2092 struct g_consumer *cp __unused, struct g_provider *pp) 2093 { 2094 struct md_s *mp; 2095 char *type; 2096 2097 mp = gp->softc; 2098 if (mp == NULL) 2099 return; 2100 2101 switch (mp->type) { 2102 case MD_MALLOC: 2103 type = "malloc"; 2104 break; 2105 case MD_PRELOAD: 2106 type = "preload"; 2107 break; 2108 case MD_VNODE: 2109 type = "vnode"; 2110 break; 2111 case MD_SWAP: 2112 type = "swap"; 2113 break; 2114 case MD_NULL: 2115 type = "null"; 2116 break; 2117 default: 2118 type = "unknown"; 2119 break; 2120 } 2121 2122 if (pp != NULL) { 2123 if (indent == NULL) { 2124 sbuf_printf(sb, " u %d", mp->unit); 2125 sbuf_printf(sb, " s %ju", (uintmax_t) mp->sectorsize); 2126 sbuf_printf(sb, " f %ju", (uintmax_t) mp->fwheads); 2127 sbuf_printf(sb, " fs %ju", (uintmax_t) mp->fwsectors); 2128 sbuf_printf(sb, " l %ju", (uintmax_t) mp->mediasize); 2129 sbuf_printf(sb, " t %s", type); 2130 if ((mp->type == MD_VNODE && mp->vnode != NULL) || 2131 (mp->type == MD_PRELOAD && mp->file[0] != '\0')) 2132 sbuf_printf(sb, " file %s", mp->file); 2133 sbuf_printf(sb, " label %s", mp->label); 2134 } else { 2135 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent, 2136 mp->unit); 2137 sbuf_printf(sb, "%s<sectorsize>%ju</sectorsize>\n", 2138 indent, (uintmax_t) mp->sectorsize); 2139 sbuf_printf(sb, "%s<fwheads>%ju</fwheads>\n", 2140 indent, (uintmax_t) mp->fwheads); 2141 sbuf_printf(sb, "%s<fwsectors>%ju</fwsectors>\n", 2142 indent, (uintmax_t) mp->fwsectors); 2143 if (mp->ident[0] != '\0') { 2144 sbuf_printf(sb, "%s<ident>", indent); 2145 g_conf_printf_escaped(sb, "%s", mp->ident); 2146 sbuf_printf(sb, "</ident>\n"); 2147 } 2148 sbuf_printf(sb, "%s<length>%ju</length>\n", 2149 indent, (uintmax_t) mp->mediasize); 2150 sbuf_printf(sb, "%s<compression>%s</compression>\n", indent, 2151 (mp->flags & MD_COMPRESS) == 0 ? "off": "on"); 2152 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 2153 (mp->flags & MD_READONLY) == 0 ? "read-write": 2154 "read-only"); 2155 sbuf_printf(sb, "%s<type>%s</type>\n", indent, 2156 type); 2157 if ((mp->type == MD_VNODE && mp->vnode != NULL) || 2158 (mp->type == MD_PRELOAD && mp->file[0] != '\0')) { 2159 sbuf_printf(sb, "%s<file>", indent); 2160 g_conf_printf_escaped(sb, "%s", mp->file); 2161 sbuf_printf(sb, "</file>\n"); 2162 } 2163 if (mp->type == MD_VNODE) 2164 sbuf_printf(sb, "%s<cache>%s</cache>\n", indent, 2165 (mp->flags & MD_CACHE) == 0 ? "off": "on"); 2166 sbuf_printf(sb, "%s<label>", indent); 2167 g_conf_printf_escaped(sb, "%s", mp->label); 2168 sbuf_printf(sb, "</label>\n"); 2169 } 2170 } 2171 } 2172 2173 static void 2174 g_md_fini(struct g_class *mp __unused) 2175 { 2176 2177 sx_destroy(&md_sx); 2178 if (status_dev != NULL) 2179 destroy_dev(status_dev); 2180 delete_unrhdr(md_uh); 2181 } 2182