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 * $FreeBSD$ 12 * 13 */ 14 15 /*- 16 * The following functions are based in the vn(4) driver: mdstart_swap(), 17 * mdstart_vnode(), mdcreate_swap(), mdcreate_vnode() and mddestroy(), 18 * and as such under the following copyright: 19 * 20 * Copyright (c) 1988 University of Utah. 21 * Copyright (c) 1990, 1993 22 * The Regents of the University of California. All rights reserved. 23 * Copyright (c) 2013 The FreeBSD Foundation 24 * All rights reserved. 25 * 26 * This code is derived from software contributed to Berkeley by 27 * the Systems Programming Group of the University of Utah Computer 28 * Science Department. 29 * 30 * Portions of this software were developed by Konstantin Belousov 31 * under sponsorship from the FreeBSD Foundation. 32 * 33 * Redistribution and use in source and binary forms, with or without 34 * modification, are permitted provided that the following conditions 35 * are met: 36 * 1. Redistributions of source code must retain the above copyright 37 * notice, this list of conditions and the following disclaimer. 38 * 2. Redistributions in binary form must reproduce the above copyright 39 * notice, this list of conditions and the following disclaimer in the 40 * documentation and/or other materials provided with the distribution. 41 * 3. Neither the name of the University nor the names of its contributors 42 * may be used to endorse or promote products derived from this software 43 * without specific prior written permission. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 48 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 55 * SUCH DAMAGE. 56 * 57 * from: Utah Hdr: vn.c 1.13 94/04/02 58 * 59 * from: @(#)vn.c 8.6 (Berkeley) 4/1/94 60 * From: src/sys/dev/vn/vn.c,v 1.122 2000/12/16 16:06:03 61 */ 62 63 #include "opt_rootdevname.h" 64 #include "opt_geom.h" 65 #include "opt_md.h" 66 67 #include <sys/param.h> 68 #include <sys/systm.h> 69 #include <sys/bio.h> 70 #include <sys/buf.h> 71 #include <sys/conf.h> 72 #include <sys/devicestat.h> 73 #include <sys/fcntl.h> 74 #include <sys/kernel.h> 75 #include <sys/kthread.h> 76 #include <sys/limits.h> 77 #include <sys/linker.h> 78 #include <sys/lock.h> 79 #include <sys/malloc.h> 80 #include <sys/mdioctl.h> 81 #include <sys/mount.h> 82 #include <sys/mutex.h> 83 #include <sys/sx.h> 84 #include <sys/namei.h> 85 #include <sys/proc.h> 86 #include <sys/queue.h> 87 #include <sys/rwlock.h> 88 #include <sys/sbuf.h> 89 #include <sys/sched.h> 90 #include <sys/sf_buf.h> 91 #include <sys/sysctl.h> 92 #include <sys/uio.h> 93 #include <sys/vnode.h> 94 #include <sys/disk.h> 95 96 #include <geom/geom.h> 97 #include <geom/geom_int.h> 98 99 #include <vm/vm.h> 100 #include <vm/vm_param.h> 101 #include <vm/vm_object.h> 102 #include <vm/vm_page.h> 103 #include <vm/vm_pager.h> 104 #include <vm/swap_pager.h> 105 #include <vm/uma.h> 106 107 #include <machine/bus.h> 108 109 #define MD_MODVER 1 110 111 #define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */ 112 #define MD_EXITING 0x20000 /* Worker thread is exiting. */ 113 #define MD_PROVIDERGONE 0x40000 /* Safe to free the softc */ 114 115 #ifndef MD_NSECT 116 #define MD_NSECT (10000 * 2) 117 #endif 118 119 struct md_req { 120 unsigned md_unit; /* unit number */ 121 enum md_types md_type; /* type of disk */ 122 off_t md_mediasize; /* size of disk in bytes */ 123 unsigned md_sectorsize; /* sectorsize */ 124 unsigned md_options; /* options */ 125 int md_fwheads; /* firmware heads */ 126 int md_fwsectors; /* firmware sectors */ 127 char *md_file; /* pathname of file to mount */ 128 enum uio_seg md_file_seg; /* location of md_file */ 129 char *md_label; /* label of the device (userspace) */ 130 int *md_units; /* pointer to units array (kernel) */ 131 size_t md_units_nitems; /* items in md_units array */ 132 }; 133 134 #ifdef COMPAT_FREEBSD32 135 struct md_ioctl32 { 136 unsigned md_version; 137 unsigned md_unit; 138 enum md_types md_type; 139 uint32_t md_file; 140 off_t md_mediasize; 141 unsigned md_sectorsize; 142 unsigned md_options; 143 uint64_t md_base; 144 int md_fwheads; 145 int md_fwsectors; 146 uint32_t md_label; 147 int md_pad[MDNPAD]; 148 } __attribute__((__packed__)); 149 CTASSERT((sizeof(struct md_ioctl32)) == 436); 150 151 #define MDIOCATTACH_32 _IOC_NEWTYPE(MDIOCATTACH, struct md_ioctl32) 152 #define MDIOCDETACH_32 _IOC_NEWTYPE(MDIOCDETACH, struct md_ioctl32) 153 #define MDIOCQUERY_32 _IOC_NEWTYPE(MDIOCQUERY, struct md_ioctl32) 154 #define MDIOCRESIZE_32 _IOC_NEWTYPE(MDIOCRESIZE, struct md_ioctl32) 155 #endif /* COMPAT_FREEBSD32 */ 156 157 static MALLOC_DEFINE(M_MD, "md_disk", "Memory Disk"); 158 static MALLOC_DEFINE(M_MDSECT, "md_sectors", "Memory Disk Sectors"); 159 160 static int md_debug; 161 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, 162 "Enable md(4) debug messages"); 163 static int md_malloc_wait; 164 SYSCTL_INT(_vm, OID_AUTO, md_malloc_wait, CTLFLAG_RW, &md_malloc_wait, 0, 165 "Allow malloc to wait for memory allocations"); 166 167 #if defined(MD_ROOT) && !defined(MD_ROOT_FSTYPE) 168 #define MD_ROOT_FSTYPE "ufs" 169 #endif 170 171 #if defined(MD_ROOT) 172 /* 173 * Preloaded image gets put here. 174 */ 175 #if defined(MD_ROOT_SIZE) 176 /* 177 * We put the mfs_root symbol into the oldmfs section of the kernel object file. 178 * Applications that patch the object with the image can determine 179 * the size looking at the oldmfs section size within the kernel. 180 */ 181 u_char mfs_root[MD_ROOT_SIZE*1024] __attribute__ ((section ("oldmfs"))); 182 const int mfs_root_size = sizeof(mfs_root); 183 #elif defined(MD_ROOT_MEM) 184 /* MD region already mapped in the memory */ 185 u_char *mfs_root; 186 int mfs_root_size; 187 #else 188 extern volatile u_char __weak_symbol mfs_root; 189 extern volatile u_char __weak_symbol mfs_root_end; 190 __GLOBL(mfs_root); 191 __GLOBL(mfs_root_end); 192 #define mfs_root_size ((uintptr_t)(&mfs_root_end - &mfs_root)) 193 #endif 194 #endif 195 196 static g_init_t g_md_init; 197 static g_fini_t g_md_fini; 198 static g_start_t g_md_start; 199 static g_access_t g_md_access; 200 static void g_md_dumpconf(struct sbuf *sb, const char *indent, 201 struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp); 202 static g_provgone_t g_md_providergone; 203 204 static struct cdev *status_dev = NULL; 205 static struct sx md_sx; 206 static struct unrhdr *md_uh; 207 208 static d_ioctl_t mdctlioctl; 209 210 static struct cdevsw mdctl_cdevsw = { 211 .d_version = D_VERSION, 212 .d_ioctl = mdctlioctl, 213 .d_name = MD_NAME, 214 }; 215 216 struct g_class g_md_class = { 217 .name = "MD", 218 .version = G_VERSION, 219 .init = g_md_init, 220 .fini = g_md_fini, 221 .start = g_md_start, 222 .access = g_md_access, 223 .dumpconf = g_md_dumpconf, 224 .providergone = g_md_providergone, 225 }; 226 227 DECLARE_GEOM_CLASS(g_md_class, g_md); 228 229 230 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(md_softc_list); 231 232 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 233 #define NMASK (NINDIR-1) 234 static int nshift; 235 236 static uma_zone_t md_pbuf_zone; 237 238 struct indir { 239 uintptr_t *array; 240 u_int total; 241 u_int used; 242 u_int shift; 243 }; 244 245 struct md_s { 246 int unit; 247 LIST_ENTRY(md_s) list; 248 struct bio_queue_head bio_queue; 249 struct mtx queue_mtx; 250 struct mtx stat_mtx; 251 struct cdev *dev; 252 enum md_types type; 253 off_t mediasize; 254 unsigned sectorsize; 255 unsigned opencount; 256 unsigned fwheads; 257 unsigned fwsectors; 258 char ident[32]; 259 unsigned flags; 260 char name[20]; 261 struct proc *procp; 262 struct g_geom *gp; 263 struct g_provider *pp; 264 int (*start)(struct md_s *sc, struct bio *bp); 265 struct devstat *devstat; 266 267 /* MD_MALLOC related fields */ 268 struct indir *indir; 269 uma_zone_t uma; 270 271 /* MD_PRELOAD related fields */ 272 u_char *pl_ptr; 273 size_t pl_len; 274 275 /* MD_VNODE related fields */ 276 struct vnode *vnode; 277 char file[PATH_MAX]; 278 char label[PATH_MAX]; 279 struct ucred *cred; 280 281 /* MD_SWAP related fields */ 282 vm_object_t object; 283 }; 284 285 static struct indir * 286 new_indir(u_int shift) 287 { 288 struct indir *ip; 289 290 ip = malloc(sizeof *ip, M_MD, (md_malloc_wait ? M_WAITOK : M_NOWAIT) 291 | M_ZERO); 292 if (ip == NULL) 293 return (NULL); 294 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 295 M_MDSECT, (md_malloc_wait ? M_WAITOK : M_NOWAIT) | M_ZERO); 296 if (ip->array == NULL) { 297 free(ip, M_MD); 298 return (NULL); 299 } 300 ip->total = NINDIR; 301 ip->shift = shift; 302 return (ip); 303 } 304 305 static void 306 del_indir(struct indir *ip) 307 { 308 309 free(ip->array, M_MDSECT); 310 free(ip, M_MD); 311 } 312 313 static void 314 destroy_indir(struct md_s *sc, struct indir *ip) 315 { 316 int i; 317 318 for (i = 0; i < NINDIR; i++) { 319 if (!ip->array[i]) 320 continue; 321 if (ip->shift) 322 destroy_indir(sc, (struct indir*)(ip->array[i])); 323 else if (ip->array[i] > 255) 324 uma_zfree(sc->uma, (void *)(ip->array[i])); 325 } 326 del_indir(ip); 327 } 328 329 /* 330 * This function does the math and allocates the top level "indir" structure 331 * for a device of "size" sectors. 332 */ 333 334 static struct indir * 335 dimension(off_t size) 336 { 337 off_t rcnt; 338 struct indir *ip; 339 int layer; 340 341 rcnt = size; 342 layer = 0; 343 while (rcnt > NINDIR) { 344 rcnt /= NINDIR; 345 layer++; 346 } 347 348 /* 349 * XXX: the top layer is probably not fully populated, so we allocate 350 * too much space for ip->array in here. 351 */ 352 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO); 353 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 354 M_MDSECT, M_WAITOK | M_ZERO); 355 ip->total = NINDIR; 356 ip->shift = layer * nshift; 357 return (ip); 358 } 359 360 /* 361 * Read a given sector 362 */ 363 364 static uintptr_t 365 s_read(struct indir *ip, off_t offset) 366 { 367 struct indir *cip; 368 int idx; 369 uintptr_t up; 370 371 if (md_debug > 1) 372 printf("s_read(%jd)\n", (intmax_t)offset); 373 up = 0; 374 for (cip = ip; cip != NULL;) { 375 if (cip->shift) { 376 idx = (offset >> cip->shift) & NMASK; 377 up = cip->array[idx]; 378 cip = (struct indir *)up; 379 continue; 380 } 381 idx = offset & NMASK; 382 return (cip->array[idx]); 383 } 384 return (0); 385 } 386 387 /* 388 * Write a given sector, prune the tree if the value is 0 389 */ 390 391 static int 392 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 393 { 394 struct indir *cip, *lip[10]; 395 int idx, li; 396 uintptr_t up; 397 398 if (md_debug > 1) 399 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 400 up = 0; 401 li = 0; 402 cip = ip; 403 for (;;) { 404 lip[li++] = cip; 405 if (cip->shift) { 406 idx = (offset >> cip->shift) & NMASK; 407 up = cip->array[idx]; 408 if (up != 0) { 409 cip = (struct indir *)up; 410 continue; 411 } 412 /* Allocate branch */ 413 cip->array[idx] = 414 (uintptr_t)new_indir(cip->shift - nshift); 415 if (cip->array[idx] == 0) 416 return (ENOSPC); 417 cip->used++; 418 up = cip->array[idx]; 419 cip = (struct indir *)up; 420 continue; 421 } 422 /* leafnode */ 423 idx = offset & NMASK; 424 up = cip->array[idx]; 425 if (up != 0) 426 cip->used--; 427 cip->array[idx] = ptr; 428 if (ptr != 0) 429 cip->used++; 430 break; 431 } 432 if (cip->used != 0 || li == 1) 433 return (0); 434 li--; 435 while (cip->used == 0 && cip != ip) { 436 li--; 437 idx = (offset >> lip[li]->shift) & NMASK; 438 up = lip[li]->array[idx]; 439 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 440 del_indir(cip); 441 lip[li]->array[idx] = 0; 442 lip[li]->used--; 443 cip = lip[li]; 444 } 445 return (0); 446 } 447 448 449 static int 450 g_md_access(struct g_provider *pp, int r, int w, int e) 451 { 452 struct md_s *sc; 453 454 sc = pp->geom->softc; 455 if (sc == NULL) { 456 if (r <= 0 && w <= 0 && e <= 0) 457 return (0); 458 return (ENXIO); 459 } 460 r += pp->acr; 461 w += pp->acw; 462 e += pp->ace; 463 if ((sc->flags & MD_READONLY) != 0 && w > 0) 464 return (EROFS); 465 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 466 sc->opencount = 1; 467 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 468 sc->opencount = 0; 469 } 470 return (0); 471 } 472 473 static void 474 g_md_start(struct bio *bp) 475 { 476 struct md_s *sc; 477 478 sc = bp->bio_to->geom->softc; 479 if ((bp->bio_cmd == BIO_READ) || (bp->bio_cmd == BIO_WRITE)) { 480 mtx_lock(&sc->stat_mtx); 481 devstat_start_transaction_bio(sc->devstat, bp); 482 mtx_unlock(&sc->stat_mtx); 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 default: 654 return (EOPNOTSUPP); 655 } 656 657 notmapped = (bp->bio_flags & BIO_UNMAPPED) != 0; 658 vlist = (bp->bio_flags & BIO_VLIST) != 0 ? 659 (bus_dma_segment_t *)bp->bio_data : NULL; 660 if (notmapped) { 661 m = bp->bio_ma; 662 ma_offs = bp->bio_ma_offset; 663 dst = NULL; 664 KASSERT(vlist == NULL, ("vlists cannot be unmapped")); 665 } else if (vlist != NULL) { 666 ma_offs = bp->bio_ma_offset; 667 dst = NULL; 668 } else { 669 dst = bp->bio_data; 670 } 671 672 nsec = bp->bio_length / sc->sectorsize; 673 secno = bp->bio_offset / sc->sectorsize; 674 error = 0; 675 while (nsec--) { 676 osp = s_read(sc->indir, secno); 677 if (bp->bio_cmd == BIO_DELETE) { 678 if (osp != 0) 679 error = s_write(sc->indir, secno, 0); 680 } else if (bp->bio_cmd == BIO_READ) { 681 if (osp == 0) { 682 if (notmapped) { 683 error = md_malloc_move_ma(&m, &ma_offs, 684 sc->sectorsize, NULL, 0, 685 MD_MALLOC_MOVE_ZERO); 686 } else if (vlist != NULL) { 687 error = md_malloc_move_vlist(&vlist, 688 &ma_offs, sc->sectorsize, NULL, 0, 689 MD_MALLOC_MOVE_ZERO); 690 } else 691 bzero(dst, sc->sectorsize); 692 } else if (osp <= 255) { 693 if (notmapped) { 694 error = md_malloc_move_ma(&m, &ma_offs, 695 sc->sectorsize, NULL, osp, 696 MD_MALLOC_MOVE_FILL); 697 } else if (vlist != NULL) { 698 error = md_malloc_move_vlist(&vlist, 699 &ma_offs, sc->sectorsize, NULL, osp, 700 MD_MALLOC_MOVE_FILL); 701 } else 702 memset(dst, osp, sc->sectorsize); 703 } else { 704 if (notmapped) { 705 error = md_malloc_move_ma(&m, &ma_offs, 706 sc->sectorsize, (void *)osp, 0, 707 MD_MALLOC_MOVE_READ); 708 } else if (vlist != NULL) { 709 error = md_malloc_move_vlist(&vlist, 710 &ma_offs, sc->sectorsize, 711 (void *)osp, 0, 712 MD_MALLOC_MOVE_READ); 713 } else { 714 bcopy((void *)osp, dst, sc->sectorsize); 715 cpu_flush_dcache(dst, sc->sectorsize); 716 } 717 } 718 osp = 0; 719 } else if (bp->bio_cmd == BIO_WRITE) { 720 if (sc->flags & MD_COMPRESS) { 721 if (notmapped) { 722 error1 = md_malloc_move_ma(&m, &ma_offs, 723 sc->sectorsize, &uc, 0, 724 MD_MALLOC_MOVE_CMP); 725 i = error1 == 0 ? sc->sectorsize : 0; 726 } else if (vlist != NULL) { 727 error1 = md_malloc_move_vlist(&vlist, 728 &ma_offs, sc->sectorsize, &uc, 0, 729 MD_MALLOC_MOVE_CMP); 730 i = error1 == 0 ? sc->sectorsize : 0; 731 } else { 732 uc = dst[0]; 733 for (i = 1; i < sc->sectorsize; i++) { 734 if (dst[i] != uc) 735 break; 736 } 737 } 738 } else { 739 i = 0; 740 uc = 0; 741 } 742 if (i == sc->sectorsize) { 743 if (osp != uc) 744 error = s_write(sc->indir, secno, uc); 745 } else { 746 if (osp <= 255) { 747 sp = (uintptr_t)uma_zalloc(sc->uma, 748 md_malloc_wait ? M_WAITOK : 749 M_NOWAIT); 750 if (sp == 0) { 751 error = ENOSPC; 752 break; 753 } 754 if (notmapped) { 755 error = md_malloc_move_ma(&m, 756 &ma_offs, sc->sectorsize, 757 (void *)sp, 0, 758 MD_MALLOC_MOVE_WRITE); 759 } else if (vlist != NULL) { 760 error = md_malloc_move_vlist( 761 &vlist, &ma_offs, 762 sc->sectorsize, (void *)sp, 763 0, MD_MALLOC_MOVE_WRITE); 764 } else { 765 bcopy(dst, (void *)sp, 766 sc->sectorsize); 767 } 768 error = s_write(sc->indir, secno, sp); 769 } else { 770 if (notmapped) { 771 error = md_malloc_move_ma(&m, 772 &ma_offs, sc->sectorsize, 773 (void *)osp, 0, 774 MD_MALLOC_MOVE_WRITE); 775 } else if (vlist != NULL) { 776 error = md_malloc_move_vlist( 777 &vlist, &ma_offs, 778 sc->sectorsize, (void *)osp, 779 0, MD_MALLOC_MOVE_WRITE); 780 } else { 781 bcopy(dst, (void *)osp, 782 sc->sectorsize); 783 } 784 osp = 0; 785 } 786 } 787 } else { 788 error = EOPNOTSUPP; 789 } 790 if (osp > 255) 791 uma_zfree(sc->uma, (void*)osp); 792 if (error != 0) 793 break; 794 secno++; 795 if (!notmapped && vlist == NULL) 796 dst += sc->sectorsize; 797 } 798 bp->bio_resid = 0; 799 return (error); 800 } 801 802 static void 803 mdcopyto_vlist(void *src, bus_dma_segment_t *vlist, off_t offset, off_t len) 804 { 805 off_t seg_len; 806 807 while (offset >= vlist->ds_len) { 808 offset -= vlist->ds_len; 809 vlist++; 810 } 811 812 while (len != 0) { 813 seg_len = omin(len, vlist->ds_len - offset); 814 bcopy(src, (void *)(uintptr_t)(vlist->ds_addr + offset), 815 seg_len); 816 offset = 0; 817 src = (uint8_t *)src + seg_len; 818 len -= seg_len; 819 vlist++; 820 } 821 } 822 823 static void 824 mdcopyfrom_vlist(bus_dma_segment_t *vlist, off_t offset, void *dst, off_t len) 825 { 826 off_t seg_len; 827 828 while (offset >= vlist->ds_len) { 829 offset -= vlist->ds_len; 830 vlist++; 831 } 832 833 while (len != 0) { 834 seg_len = omin(len, vlist->ds_len - offset); 835 bcopy((void *)(uintptr_t)(vlist->ds_addr + offset), dst, 836 seg_len); 837 offset = 0; 838 dst = (uint8_t *)dst + seg_len; 839 len -= seg_len; 840 vlist++; 841 } 842 } 843 844 static int 845 mdstart_preload(struct md_s *sc, struct bio *bp) 846 { 847 uint8_t *p; 848 849 p = sc->pl_ptr + bp->bio_offset; 850 switch (bp->bio_cmd) { 851 case BIO_READ: 852 if ((bp->bio_flags & BIO_VLIST) != 0) { 853 mdcopyto_vlist(p, (bus_dma_segment_t *)bp->bio_data, 854 bp->bio_ma_offset, bp->bio_length); 855 } else { 856 bcopy(p, bp->bio_data, bp->bio_length); 857 } 858 cpu_flush_dcache(bp->bio_data, bp->bio_length); 859 break; 860 case BIO_WRITE: 861 if ((bp->bio_flags & BIO_VLIST) != 0) { 862 mdcopyfrom_vlist((bus_dma_segment_t *)bp->bio_data, 863 bp->bio_ma_offset, p, bp->bio_length); 864 } else { 865 bcopy(bp->bio_data, p, bp->bio_length); 866 } 867 break; 868 } 869 bp->bio_resid = 0; 870 return (0); 871 } 872 873 static int 874 mdstart_vnode(struct md_s *sc, struct bio *bp) 875 { 876 int error; 877 struct uio auio; 878 struct iovec aiov; 879 struct iovec *piov; 880 struct mount *mp; 881 struct vnode *vp; 882 struct buf *pb; 883 bus_dma_segment_t *vlist; 884 struct thread *td; 885 off_t iolen, iostart, len, zerosize; 886 int ma_offs, npages; 887 888 switch (bp->bio_cmd) { 889 case BIO_READ: 890 auio.uio_rw = UIO_READ; 891 break; 892 case BIO_WRITE: 893 case BIO_DELETE: 894 auio.uio_rw = UIO_WRITE; 895 break; 896 case BIO_FLUSH: 897 break; 898 default: 899 return (EOPNOTSUPP); 900 } 901 902 td = curthread; 903 vp = sc->vnode; 904 pb = NULL; 905 piov = NULL; 906 ma_offs = bp->bio_ma_offset; 907 len = bp->bio_length; 908 909 /* 910 * VNODE I/O 911 * 912 * If an error occurs, we set BIO_ERROR but we do not set 913 * B_INVAL because (for a write anyway), the buffer is 914 * still valid. 915 */ 916 917 if (bp->bio_cmd == BIO_FLUSH) { 918 (void) vn_start_write(vp, &mp, V_WAIT); 919 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 920 error = VOP_FSYNC(vp, MNT_WAIT, td); 921 VOP_UNLOCK(vp, 0); 922 vn_finished_write(mp); 923 return (error); 924 } 925 926 auio.uio_offset = (vm_ooffset_t)bp->bio_offset; 927 auio.uio_resid = bp->bio_length; 928 auio.uio_segflg = UIO_SYSSPACE; 929 auio.uio_td = td; 930 931 if (bp->bio_cmd == BIO_DELETE) { 932 /* 933 * Emulate BIO_DELETE by writing zeros. 934 */ 935 zerosize = ZERO_REGION_SIZE - 936 (ZERO_REGION_SIZE % sc->sectorsize); 937 auio.uio_iovcnt = howmany(bp->bio_length, zerosize); 938 piov = malloc(sizeof(*piov) * auio.uio_iovcnt, M_MD, M_WAITOK); 939 auio.uio_iov = piov; 940 while (len > 0) { 941 piov->iov_base = __DECONST(void *, zero_region); 942 piov->iov_len = len; 943 if (len > zerosize) 944 piov->iov_len = zerosize; 945 len -= piov->iov_len; 946 piov++; 947 } 948 piov = auio.uio_iov; 949 } else if ((bp->bio_flags & BIO_VLIST) != 0) { 950 piov = malloc(sizeof(*piov) * bp->bio_ma_n, M_MD, M_WAITOK); 951 auio.uio_iov = piov; 952 vlist = (bus_dma_segment_t *)bp->bio_data; 953 while (len > 0) { 954 piov->iov_base = (void *)(uintptr_t)(vlist->ds_addr + 955 ma_offs); 956 piov->iov_len = vlist->ds_len - ma_offs; 957 if (piov->iov_len > len) 958 piov->iov_len = len; 959 len -= piov->iov_len; 960 ma_offs = 0; 961 vlist++; 962 piov++; 963 } 964 auio.uio_iovcnt = piov - auio.uio_iov; 965 piov = auio.uio_iov; 966 } else if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 967 pb = uma_zalloc(md_pbuf_zone, M_WAITOK); 968 bp->bio_resid = len; 969 unmapped_step: 970 npages = atop(min(MAXPHYS, round_page(len + (ma_offs & 971 PAGE_MASK)))); 972 iolen = min(ptoa(npages) - (ma_offs & PAGE_MASK), len); 973 KASSERT(iolen > 0, ("zero iolen")); 974 pmap_qenter((vm_offset_t)pb->b_data, 975 &bp->bio_ma[atop(ma_offs)], npages); 976 aiov.iov_base = (void *)((vm_offset_t)pb->b_data + 977 (ma_offs & PAGE_MASK)); 978 aiov.iov_len = iolen; 979 auio.uio_iov = &aiov; 980 auio.uio_iovcnt = 1; 981 auio.uio_resid = iolen; 982 } else { 983 aiov.iov_base = bp->bio_data; 984 aiov.iov_len = bp->bio_length; 985 auio.uio_iov = &aiov; 986 auio.uio_iovcnt = 1; 987 } 988 iostart = auio.uio_offset; 989 if (auio.uio_rw == UIO_READ) { 990 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 991 error = VOP_READ(vp, &auio, 0, sc->cred); 992 VOP_UNLOCK(vp, 0); 993 } else { 994 (void) vn_start_write(vp, &mp, V_WAIT); 995 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 996 error = VOP_WRITE(vp, &auio, sc->flags & MD_ASYNC ? 0 : IO_SYNC, 997 sc->cred); 998 VOP_UNLOCK(vp, 0); 999 vn_finished_write(mp); 1000 if (error == 0) 1001 sc->flags &= ~MD_VERIFY; 1002 } 1003 1004 /* When MD_CACHE is set, try to avoid double-caching the data. */ 1005 if (error == 0 && (sc->flags & MD_CACHE) == 0) 1006 VOP_ADVISE(vp, iostart, auio.uio_offset - 1, 1007 POSIX_FADV_DONTNEED); 1008 1009 if (pb != NULL) { 1010 pmap_qremove((vm_offset_t)pb->b_data, npages); 1011 if (error == 0) { 1012 len -= iolen; 1013 bp->bio_resid -= iolen; 1014 ma_offs += iolen; 1015 if (len > 0) 1016 goto unmapped_step; 1017 } 1018 uma_zfree(md_pbuf_zone, pb); 1019 } 1020 1021 free(piov, M_MD); 1022 if (pb == NULL) 1023 bp->bio_resid = auio.uio_resid; 1024 return (error); 1025 } 1026 1027 static int 1028 mdstart_swap(struct md_s *sc, struct bio *bp) 1029 { 1030 vm_page_t m; 1031 u_char *p; 1032 vm_pindex_t i, lastp; 1033 bus_dma_segment_t *vlist; 1034 int rv, ma_offs, offs, len, lastend; 1035 1036 switch (bp->bio_cmd) { 1037 case BIO_READ: 1038 case BIO_WRITE: 1039 case BIO_DELETE: 1040 break; 1041 default: 1042 return (EOPNOTSUPP); 1043 } 1044 1045 p = bp->bio_data; 1046 ma_offs = (bp->bio_flags & (BIO_UNMAPPED|BIO_VLIST)) != 0 ? 1047 bp->bio_ma_offset : 0; 1048 vlist = (bp->bio_flags & BIO_VLIST) != 0 ? 1049 (bus_dma_segment_t *)bp->bio_data : NULL; 1050 1051 /* 1052 * offs is the offset at which to start operating on the 1053 * next (ie, first) page. lastp is the last page on 1054 * which we're going to operate. lastend is the ending 1055 * position within that last page (ie, PAGE_SIZE if 1056 * we're operating on complete aligned pages). 1057 */ 1058 offs = bp->bio_offset % PAGE_SIZE; 1059 lastp = (bp->bio_offset + bp->bio_length - 1) / PAGE_SIZE; 1060 lastend = (bp->bio_offset + bp->bio_length - 1) % PAGE_SIZE + 1; 1061 1062 rv = VM_PAGER_OK; 1063 VM_OBJECT_WLOCK(sc->object); 1064 vm_object_pip_add(sc->object, 1); 1065 for (i = bp->bio_offset / PAGE_SIZE; i <= lastp; i++) { 1066 len = ((i == lastp) ? lastend : PAGE_SIZE) - offs; 1067 m = vm_page_grab(sc->object, i, VM_ALLOC_SYSTEM); 1068 if (bp->bio_cmd == BIO_READ) { 1069 if (vm_page_all_valid(m)) 1070 rv = VM_PAGER_OK; 1071 else 1072 rv = vm_pager_get_pages(sc->object, &m, 1, 1073 NULL, NULL); 1074 if (rv == VM_PAGER_ERROR) { 1075 vm_page_free(m); 1076 break; 1077 } else if (rv == VM_PAGER_FAIL) { 1078 /* 1079 * Pager does not have the page. Zero 1080 * the allocated page, and mark it as 1081 * valid. Do not set dirty, the page 1082 * can be recreated if thrown out. 1083 */ 1084 pmap_zero_page(m); 1085 vm_page_valid(m); 1086 } 1087 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 1088 pmap_copy_pages(&m, offs, bp->bio_ma, 1089 ma_offs, len); 1090 } else if ((bp->bio_flags & BIO_VLIST) != 0) { 1091 physcopyout_vlist(VM_PAGE_TO_PHYS(m) + offs, 1092 vlist, ma_offs, len); 1093 cpu_flush_dcache(p, len); 1094 } else { 1095 physcopyout(VM_PAGE_TO_PHYS(m) + offs, p, len); 1096 cpu_flush_dcache(p, len); 1097 } 1098 } else if (bp->bio_cmd == BIO_WRITE) { 1099 if (len == PAGE_SIZE || vm_page_all_valid(m)) 1100 rv = VM_PAGER_OK; 1101 else 1102 rv = vm_pager_get_pages(sc->object, &m, 1, 1103 NULL, NULL); 1104 if (rv == VM_PAGER_ERROR) { 1105 vm_page_free(m); 1106 break; 1107 } else if (rv == VM_PAGER_FAIL) 1108 pmap_zero_page(m); 1109 1110 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 1111 pmap_copy_pages(bp->bio_ma, ma_offs, &m, 1112 offs, len); 1113 } else if ((bp->bio_flags & BIO_VLIST) != 0) { 1114 physcopyin_vlist(vlist, ma_offs, 1115 VM_PAGE_TO_PHYS(m) + offs, len); 1116 } else { 1117 physcopyin(p, VM_PAGE_TO_PHYS(m) + offs, len); 1118 } 1119 1120 vm_page_valid(m); 1121 vm_page_set_dirty(m); 1122 } else if (bp->bio_cmd == BIO_DELETE) { 1123 if (len == PAGE_SIZE || vm_page_all_valid(m)) 1124 rv = VM_PAGER_OK; 1125 else 1126 rv = vm_pager_get_pages(sc->object, &m, 1, 1127 NULL, NULL); 1128 if (rv == VM_PAGER_ERROR) { 1129 vm_page_free(m); 1130 break; 1131 } else if (rv == VM_PAGER_FAIL) { 1132 vm_page_free(m); 1133 m = NULL; 1134 } else { 1135 /* Page is valid. */ 1136 if (len != PAGE_SIZE) { 1137 pmap_zero_page_area(m, offs, len); 1138 vm_page_set_dirty(m); 1139 } else { 1140 vm_pager_page_unswapped(m); 1141 vm_page_free(m); 1142 m = NULL; 1143 } 1144 } 1145 } 1146 if (m != NULL) { 1147 vm_page_xunbusy(m); 1148 vm_page_reference(m); 1149 } 1150 1151 /* Actions on further pages start at offset 0 */ 1152 p += PAGE_SIZE - offs; 1153 offs = 0; 1154 ma_offs += len; 1155 } 1156 vm_object_pip_wakeup(sc->object); 1157 VM_OBJECT_WUNLOCK(sc->object); 1158 return (rv != VM_PAGER_ERROR ? 0 : ENOSPC); 1159 } 1160 1161 static int 1162 mdstart_null(struct md_s *sc, struct bio *bp) 1163 { 1164 1165 switch (bp->bio_cmd) { 1166 case BIO_READ: 1167 bzero(bp->bio_data, bp->bio_length); 1168 cpu_flush_dcache(bp->bio_data, bp->bio_length); 1169 break; 1170 case BIO_WRITE: 1171 break; 1172 } 1173 bp->bio_resid = 0; 1174 return (0); 1175 } 1176 1177 static void 1178 md_kthread(void *arg) 1179 { 1180 struct md_s *sc; 1181 struct bio *bp; 1182 int error; 1183 1184 sc = arg; 1185 thread_lock(curthread); 1186 sched_prio(curthread, PRIBIO); 1187 thread_unlock(curthread); 1188 if (sc->type == MD_VNODE) 1189 curthread->td_pflags |= TDP_NORUNNINGBUF; 1190 1191 for (;;) { 1192 mtx_lock(&sc->queue_mtx); 1193 if (sc->flags & MD_SHUTDOWN) { 1194 sc->flags |= MD_EXITING; 1195 mtx_unlock(&sc->queue_mtx); 1196 kproc_exit(0); 1197 } 1198 bp = bioq_takefirst(&sc->bio_queue); 1199 if (!bp) { 1200 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 1201 continue; 1202 } 1203 mtx_unlock(&sc->queue_mtx); 1204 if (bp->bio_cmd == BIO_GETATTR) { 1205 int isv = ((sc->flags & MD_VERIFY) != 0); 1206 1207 if ((sc->fwsectors && sc->fwheads && 1208 (g_handleattr_int(bp, "GEOM::fwsectors", 1209 sc->fwsectors) || 1210 g_handleattr_int(bp, "GEOM::fwheads", 1211 sc->fwheads))) || 1212 g_handleattr_int(bp, "GEOM::candelete", 1)) 1213 error = -1; 1214 else if (sc->ident[0] != '\0' && 1215 g_handleattr_str(bp, "GEOM::ident", sc->ident)) 1216 error = -1; 1217 else if (g_handleattr_int(bp, "MNT::verified", isv)) 1218 error = -1; 1219 else 1220 error = EOPNOTSUPP; 1221 } else { 1222 error = sc->start(sc, bp); 1223 } 1224 1225 if (bp->bio_cmd == BIO_READ || bp->bio_cmd == BIO_WRITE) { 1226 /* 1227 * Devstat uses (bio_bcount, bio_resid) for 1228 * determining the length of the completed part of 1229 * the i/o. g_io_deliver() will translate from 1230 * bio_completed to that, but it also destroys the 1231 * bio so we must do our own translation. 1232 */ 1233 bp->bio_bcount = bp->bio_length; 1234 bp->bio_resid = (error == -1 ? bp->bio_bcount : 0); 1235 devstat_end_transaction_bio(sc->devstat, bp); 1236 } 1237 if (error != -1) { 1238 bp->bio_completed = bp->bio_length; 1239 g_io_deliver(bp, error); 1240 } 1241 } 1242 } 1243 1244 static struct md_s * 1245 mdfind(int unit) 1246 { 1247 struct md_s *sc; 1248 1249 LIST_FOREACH(sc, &md_softc_list, list) { 1250 if (sc->unit == unit) 1251 break; 1252 } 1253 return (sc); 1254 } 1255 1256 static struct md_s * 1257 mdnew(int unit, int *errp, enum md_types type) 1258 { 1259 struct md_s *sc; 1260 int error; 1261 1262 *errp = 0; 1263 if (unit == -1) 1264 unit = alloc_unr(md_uh); 1265 else 1266 unit = alloc_unr_specific(md_uh, unit); 1267 1268 if (unit == -1) { 1269 *errp = EBUSY; 1270 return (NULL); 1271 } 1272 1273 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 1274 sc->type = type; 1275 bioq_init(&sc->bio_queue); 1276 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 1277 mtx_init(&sc->stat_mtx, "md stat", NULL, MTX_DEF); 1278 sc->unit = unit; 1279 sprintf(sc->name, "md%d", unit); 1280 LIST_INSERT_HEAD(&md_softc_list, sc, list); 1281 error = kproc_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 1282 if (error == 0) 1283 return (sc); 1284 LIST_REMOVE(sc, list); 1285 mtx_destroy(&sc->stat_mtx); 1286 mtx_destroy(&sc->queue_mtx); 1287 free_unr(md_uh, sc->unit); 1288 free(sc, M_MD); 1289 *errp = error; 1290 return (NULL); 1291 } 1292 1293 static void 1294 mdinit(struct md_s *sc) 1295 { 1296 struct g_geom *gp; 1297 struct g_provider *pp; 1298 1299 g_topology_lock(); 1300 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 1301 gp->softc = sc; 1302 pp = g_new_providerf(gp, "md%d", sc->unit); 1303 pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE; 1304 pp->mediasize = sc->mediasize; 1305 pp->sectorsize = sc->sectorsize; 1306 switch (sc->type) { 1307 case MD_MALLOC: 1308 case MD_VNODE: 1309 case MD_SWAP: 1310 pp->flags |= G_PF_ACCEPT_UNMAPPED; 1311 break; 1312 case MD_PRELOAD: 1313 case MD_NULL: 1314 break; 1315 } 1316 sc->gp = gp; 1317 sc->pp = pp; 1318 g_error_provider(pp, 0); 1319 g_topology_unlock(); 1320 sc->devstat = devstat_new_entry("md", sc->unit, sc->sectorsize, 1321 DEVSTAT_ALL_SUPPORTED, DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 1322 } 1323 1324 static int 1325 mdcreate_malloc(struct md_s *sc, struct md_req *mdr) 1326 { 1327 uintptr_t sp; 1328 int error; 1329 off_t u; 1330 1331 error = 0; 1332 if (mdr->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 1333 return (EINVAL); 1334 if (mdr->md_sectorsize != 0 && !powerof2(mdr->md_sectorsize)) 1335 return (EINVAL); 1336 /* Compression doesn't make sense if we have reserved space */ 1337 if (mdr->md_options & MD_RESERVE) 1338 mdr->md_options &= ~MD_COMPRESS; 1339 if (mdr->md_fwsectors != 0) 1340 sc->fwsectors = mdr->md_fwsectors; 1341 if (mdr->md_fwheads != 0) 1342 sc->fwheads = mdr->md_fwheads; 1343 sc->flags = mdr->md_options & (MD_COMPRESS | MD_FORCE); 1344 sc->indir = dimension(sc->mediasize / sc->sectorsize); 1345 sc->uma = uma_zcreate(sc->name, sc->sectorsize, NULL, NULL, NULL, NULL, 1346 0x1ff, 0); 1347 if (mdr->md_options & MD_RESERVE) { 1348 off_t nsectors; 1349 1350 nsectors = sc->mediasize / sc->sectorsize; 1351 for (u = 0; u < nsectors; u++) { 1352 sp = (uintptr_t)uma_zalloc(sc->uma, (md_malloc_wait ? 1353 M_WAITOK : M_NOWAIT) | M_ZERO); 1354 if (sp != 0) 1355 error = s_write(sc->indir, u, sp); 1356 else 1357 error = ENOMEM; 1358 if (error != 0) 1359 break; 1360 } 1361 } 1362 return (error); 1363 } 1364 1365 1366 static int 1367 mdsetcred(struct md_s *sc, struct ucred *cred) 1368 { 1369 char *tmpbuf; 1370 int error = 0; 1371 1372 /* 1373 * Set credits in our softc 1374 */ 1375 1376 if (sc->cred) 1377 crfree(sc->cred); 1378 sc->cred = crhold(cred); 1379 1380 /* 1381 * Horrible kludge to establish credentials for NFS XXX. 1382 */ 1383 1384 if (sc->vnode) { 1385 struct uio auio; 1386 struct iovec aiov; 1387 1388 tmpbuf = malloc(sc->sectorsize, M_TEMP, M_WAITOK); 1389 bzero(&auio, sizeof(auio)); 1390 1391 aiov.iov_base = tmpbuf; 1392 aiov.iov_len = sc->sectorsize; 1393 auio.uio_iov = &aiov; 1394 auio.uio_iovcnt = 1; 1395 auio.uio_offset = 0; 1396 auio.uio_rw = UIO_READ; 1397 auio.uio_segflg = UIO_SYSSPACE; 1398 auio.uio_resid = aiov.iov_len; 1399 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY); 1400 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 1401 VOP_UNLOCK(sc->vnode, 0); 1402 free(tmpbuf, M_TEMP); 1403 } 1404 return (error); 1405 } 1406 1407 static int 1408 mdcreate_vnode(struct md_s *sc, struct md_req *mdr, struct thread *td) 1409 { 1410 struct vattr vattr; 1411 struct nameidata nd; 1412 char *fname; 1413 int error, flags; 1414 1415 fname = mdr->md_file; 1416 if (mdr->md_file_seg == UIO_USERSPACE) { 1417 error = copyinstr(fname, sc->file, sizeof(sc->file), NULL); 1418 if (error != 0) 1419 return (error); 1420 } else if (mdr->md_file_seg == UIO_SYSSPACE) 1421 strlcpy(sc->file, fname, sizeof(sc->file)); 1422 else 1423 return (EDOOFUS); 1424 1425 /* 1426 * If the user specified that this is a read only device, don't 1427 * set the FWRITE mask before trying to open the backing store. 1428 */ 1429 flags = FREAD | ((mdr->md_options & MD_READONLY) ? 0 : FWRITE) \ 1430 | ((mdr->md_options & MD_VERIFY) ? O_VERIFY : 0); 1431 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, sc->file, td); 1432 error = vn_open(&nd, &flags, 0, NULL); 1433 if (error != 0) 1434 return (error); 1435 NDFREE(&nd, NDF_ONLY_PNBUF); 1436 if (nd.ni_vp->v_type != VREG) { 1437 error = EINVAL; 1438 goto bad; 1439 } 1440 error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred); 1441 if (error != 0) 1442 goto bad; 1443 if (VOP_ISLOCKED(nd.ni_vp) != LK_EXCLUSIVE) { 1444 vn_lock(nd.ni_vp, LK_UPGRADE | LK_RETRY); 1445 if (VN_IS_DOOMED(nd.ni_vp)) { 1446 /* Forced unmount. */ 1447 error = EBADF; 1448 goto bad; 1449 } 1450 } 1451 nd.ni_vp->v_vflag |= VV_MD; 1452 VOP_UNLOCK(nd.ni_vp, 0); 1453 1454 if (mdr->md_fwsectors != 0) 1455 sc->fwsectors = mdr->md_fwsectors; 1456 if (mdr->md_fwheads != 0) 1457 sc->fwheads = mdr->md_fwheads; 1458 snprintf(sc->ident, sizeof(sc->ident), "MD-DEV%ju-INO%ju", 1459 (uintmax_t)vattr.va_fsid, (uintmax_t)vattr.va_fileid); 1460 sc->flags = mdr->md_options & (MD_ASYNC | MD_CACHE | MD_FORCE | 1461 MD_VERIFY); 1462 if (!(flags & FWRITE)) 1463 sc->flags |= MD_READONLY; 1464 sc->vnode = nd.ni_vp; 1465 1466 error = mdsetcred(sc, td->td_ucred); 1467 if (error != 0) { 1468 sc->vnode = NULL; 1469 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY); 1470 nd.ni_vp->v_vflag &= ~VV_MD; 1471 goto bad; 1472 } 1473 return (0); 1474 bad: 1475 VOP_UNLOCK(nd.ni_vp, 0); 1476 (void)vn_close(nd.ni_vp, flags, td->td_ucred, td); 1477 return (error); 1478 } 1479 1480 static void 1481 g_md_providergone(struct g_provider *pp) 1482 { 1483 struct md_s *sc = pp->geom->softc; 1484 1485 mtx_lock(&sc->queue_mtx); 1486 sc->flags |= MD_PROVIDERGONE; 1487 wakeup(&sc->flags); 1488 mtx_unlock(&sc->queue_mtx); 1489 } 1490 1491 static int 1492 mddestroy(struct md_s *sc, struct thread *td) 1493 { 1494 1495 if (sc->gp) { 1496 g_topology_lock(); 1497 g_wither_geom(sc->gp, ENXIO); 1498 g_topology_unlock(); 1499 1500 mtx_lock(&sc->queue_mtx); 1501 while (!(sc->flags & MD_PROVIDERGONE)) 1502 msleep(&sc->flags, &sc->queue_mtx, PRIBIO, "mddestroy", 0); 1503 mtx_unlock(&sc->queue_mtx); 1504 } 1505 if (sc->devstat) { 1506 devstat_remove_entry(sc->devstat); 1507 sc->devstat = NULL; 1508 } 1509 mtx_lock(&sc->queue_mtx); 1510 sc->flags |= MD_SHUTDOWN; 1511 wakeup(sc); 1512 while (!(sc->flags & MD_EXITING)) 1513 msleep(sc->procp, &sc->queue_mtx, PRIBIO, "mddestroy", hz / 10); 1514 mtx_unlock(&sc->queue_mtx); 1515 mtx_destroy(&sc->stat_mtx); 1516 mtx_destroy(&sc->queue_mtx); 1517 if (sc->vnode != NULL) { 1518 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY); 1519 sc->vnode->v_vflag &= ~VV_MD; 1520 VOP_UNLOCK(sc->vnode, 0); 1521 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 1522 FREAD : (FREAD|FWRITE), sc->cred, td); 1523 } 1524 if (sc->cred != NULL) 1525 crfree(sc->cred); 1526 if (sc->object != NULL) 1527 vm_object_deallocate(sc->object); 1528 if (sc->indir) 1529 destroy_indir(sc, sc->indir); 1530 if (sc->uma) 1531 uma_zdestroy(sc->uma); 1532 1533 LIST_REMOVE(sc, list); 1534 free_unr(md_uh, sc->unit); 1535 free(sc, M_MD); 1536 return (0); 1537 } 1538 1539 static int 1540 mdresize(struct md_s *sc, struct md_req *mdr) 1541 { 1542 int error, res; 1543 vm_pindex_t oldpages, newpages; 1544 1545 switch (sc->type) { 1546 case MD_VNODE: 1547 case MD_NULL: 1548 break; 1549 case MD_SWAP: 1550 if (mdr->md_mediasize <= 0 || 1551 (mdr->md_mediasize % PAGE_SIZE) != 0) 1552 return (EDOM); 1553 oldpages = OFF_TO_IDX(round_page(sc->mediasize)); 1554 newpages = OFF_TO_IDX(round_page(mdr->md_mediasize)); 1555 if (newpages < oldpages) { 1556 VM_OBJECT_WLOCK(sc->object); 1557 vm_object_page_remove(sc->object, newpages, 0, 0); 1558 swap_pager_freespace(sc->object, newpages, 1559 oldpages - newpages); 1560 swap_release_by_cred(IDX_TO_OFF(oldpages - 1561 newpages), sc->cred); 1562 sc->object->charge = IDX_TO_OFF(newpages); 1563 sc->object->size = newpages; 1564 VM_OBJECT_WUNLOCK(sc->object); 1565 } else if (newpages > oldpages) { 1566 res = swap_reserve_by_cred(IDX_TO_OFF(newpages - 1567 oldpages), sc->cred); 1568 if (!res) 1569 return (ENOMEM); 1570 if ((mdr->md_options & MD_RESERVE) || 1571 (sc->flags & MD_RESERVE)) { 1572 error = swap_pager_reserve(sc->object, 1573 oldpages, newpages - oldpages); 1574 if (error < 0) { 1575 swap_release_by_cred( 1576 IDX_TO_OFF(newpages - oldpages), 1577 sc->cred); 1578 return (EDOM); 1579 } 1580 } 1581 VM_OBJECT_WLOCK(sc->object); 1582 sc->object->charge = IDX_TO_OFF(newpages); 1583 sc->object->size = newpages; 1584 VM_OBJECT_WUNLOCK(sc->object); 1585 } 1586 break; 1587 default: 1588 return (EOPNOTSUPP); 1589 } 1590 1591 sc->mediasize = mdr->md_mediasize; 1592 g_topology_lock(); 1593 g_resize_provider(sc->pp, sc->mediasize); 1594 g_topology_unlock(); 1595 return (0); 1596 } 1597 1598 static int 1599 mdcreate_swap(struct md_s *sc, struct md_req *mdr, struct thread *td) 1600 { 1601 vm_ooffset_t npage; 1602 int error; 1603 1604 /* 1605 * Range check. Disallow negative sizes and sizes not being 1606 * multiple of page size. 1607 */ 1608 if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0) 1609 return (EDOM); 1610 1611 /* 1612 * Allocate an OBJT_SWAP object. 1613 * 1614 * Note the truncation. 1615 */ 1616 1617 if ((mdr->md_options & MD_VERIFY) != 0) 1618 return (EINVAL); 1619 npage = mdr->md_mediasize / PAGE_SIZE; 1620 if (mdr->md_fwsectors != 0) 1621 sc->fwsectors = mdr->md_fwsectors; 1622 if (mdr->md_fwheads != 0) 1623 sc->fwheads = mdr->md_fwheads; 1624 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * npage, 1625 VM_PROT_DEFAULT, 0, td->td_ucred); 1626 if (sc->object == NULL) 1627 return (ENOMEM); 1628 sc->flags = mdr->md_options & (MD_FORCE | MD_RESERVE); 1629 if (mdr->md_options & MD_RESERVE) { 1630 if (swap_pager_reserve(sc->object, 0, npage) < 0) { 1631 error = EDOM; 1632 goto finish; 1633 } 1634 } 1635 error = mdsetcred(sc, td->td_ucred); 1636 finish: 1637 if (error != 0) { 1638 vm_object_deallocate(sc->object); 1639 sc->object = NULL; 1640 } 1641 return (error); 1642 } 1643 1644 static int 1645 mdcreate_null(struct md_s *sc, struct md_req *mdr, struct thread *td) 1646 { 1647 1648 /* 1649 * Range check. Disallow negative sizes and sizes not being 1650 * multiple of page size. 1651 */ 1652 if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0) 1653 return (EDOM); 1654 1655 return (0); 1656 } 1657 1658 static int 1659 kern_mdattach_locked(struct thread *td, struct md_req *mdr) 1660 { 1661 struct md_s *sc; 1662 unsigned sectsize; 1663 int error, i; 1664 1665 sx_assert(&md_sx, SA_XLOCKED); 1666 1667 switch (mdr->md_type) { 1668 case MD_MALLOC: 1669 case MD_PRELOAD: 1670 case MD_VNODE: 1671 case MD_SWAP: 1672 case MD_NULL: 1673 break; 1674 default: 1675 return (EINVAL); 1676 } 1677 if (mdr->md_sectorsize == 0) 1678 sectsize = DEV_BSIZE; 1679 else 1680 sectsize = mdr->md_sectorsize; 1681 if (sectsize > MAXPHYS || mdr->md_mediasize < sectsize) 1682 return (EINVAL); 1683 if (mdr->md_options & MD_AUTOUNIT) 1684 sc = mdnew(-1, &error, mdr->md_type); 1685 else { 1686 if (mdr->md_unit > INT_MAX) 1687 return (EINVAL); 1688 sc = mdnew(mdr->md_unit, &error, mdr->md_type); 1689 } 1690 if (sc == NULL) 1691 return (error); 1692 if (mdr->md_label != NULL) 1693 error = copyinstr(mdr->md_label, sc->label, 1694 sizeof(sc->label), NULL); 1695 if (error != 0) 1696 goto err_after_new; 1697 if (mdr->md_options & MD_AUTOUNIT) 1698 mdr->md_unit = sc->unit; 1699 sc->mediasize = mdr->md_mediasize; 1700 sc->sectorsize = sectsize; 1701 error = EDOOFUS; 1702 switch (sc->type) { 1703 case MD_MALLOC: 1704 sc->start = mdstart_malloc; 1705 error = mdcreate_malloc(sc, mdr); 1706 break; 1707 case MD_PRELOAD: 1708 /* 1709 * We disallow attaching preloaded memory disks via 1710 * ioctl. Preloaded memory disks are automatically 1711 * attached in g_md_init(). 1712 */ 1713 error = EOPNOTSUPP; 1714 break; 1715 case MD_VNODE: 1716 sc->start = mdstart_vnode; 1717 error = mdcreate_vnode(sc, mdr, td); 1718 break; 1719 case MD_SWAP: 1720 sc->start = mdstart_swap; 1721 error = mdcreate_swap(sc, mdr, td); 1722 break; 1723 case MD_NULL: 1724 sc->start = mdstart_null; 1725 error = mdcreate_null(sc, mdr, td); 1726 break; 1727 } 1728 err_after_new: 1729 if (error != 0) { 1730 mddestroy(sc, td); 1731 return (error); 1732 } 1733 1734 /* Prune off any residual fractional sector */ 1735 i = sc->mediasize % sc->sectorsize; 1736 sc->mediasize -= i; 1737 1738 mdinit(sc); 1739 return (0); 1740 } 1741 1742 static int 1743 kern_mdattach(struct thread *td, struct md_req *mdr) 1744 { 1745 int error; 1746 1747 sx_xlock(&md_sx); 1748 error = kern_mdattach_locked(td, mdr); 1749 sx_xunlock(&md_sx); 1750 return (error); 1751 } 1752 1753 static int 1754 kern_mddetach_locked(struct thread *td, struct md_req *mdr) 1755 { 1756 struct md_s *sc; 1757 1758 sx_assert(&md_sx, SA_XLOCKED); 1759 1760 if (mdr->md_mediasize != 0 || 1761 (mdr->md_options & ~MD_FORCE) != 0) 1762 return (EINVAL); 1763 1764 sc = mdfind(mdr->md_unit); 1765 if (sc == NULL) 1766 return (ENOENT); 1767 if (sc->opencount != 0 && !(sc->flags & MD_FORCE) && 1768 !(mdr->md_options & MD_FORCE)) 1769 return (EBUSY); 1770 return (mddestroy(sc, td)); 1771 } 1772 1773 static int 1774 kern_mddetach(struct thread *td, struct md_req *mdr) 1775 { 1776 int error; 1777 1778 sx_xlock(&md_sx); 1779 error = kern_mddetach_locked(td, mdr); 1780 sx_xunlock(&md_sx); 1781 return (error); 1782 } 1783 1784 static int 1785 kern_mdresize_locked(struct md_req *mdr) 1786 { 1787 struct md_s *sc; 1788 1789 sx_assert(&md_sx, SA_XLOCKED); 1790 1791 if ((mdr->md_options & ~(MD_FORCE | MD_RESERVE)) != 0) 1792 return (EINVAL); 1793 1794 sc = mdfind(mdr->md_unit); 1795 if (sc == NULL) 1796 return (ENOENT); 1797 if (mdr->md_mediasize < sc->sectorsize) 1798 return (EINVAL); 1799 if (mdr->md_mediasize < sc->mediasize && 1800 !(sc->flags & MD_FORCE) && 1801 !(mdr->md_options & MD_FORCE)) 1802 return (EBUSY); 1803 return (mdresize(sc, mdr)); 1804 } 1805 1806 static int 1807 kern_mdresize(struct md_req *mdr) 1808 { 1809 int error; 1810 1811 sx_xlock(&md_sx); 1812 error = kern_mdresize_locked(mdr); 1813 sx_xunlock(&md_sx); 1814 return (error); 1815 } 1816 1817 static int 1818 kern_mdquery_locked(struct md_req *mdr) 1819 { 1820 struct md_s *sc; 1821 int error; 1822 1823 sx_assert(&md_sx, SA_XLOCKED); 1824 1825 sc = mdfind(mdr->md_unit); 1826 if (sc == NULL) 1827 return (ENOENT); 1828 mdr->md_type = sc->type; 1829 mdr->md_options = sc->flags; 1830 mdr->md_mediasize = sc->mediasize; 1831 mdr->md_sectorsize = sc->sectorsize; 1832 error = 0; 1833 if (mdr->md_label != NULL) { 1834 error = copyout(sc->label, mdr->md_label, 1835 strlen(sc->label) + 1); 1836 if (error != 0) 1837 return (error); 1838 } 1839 if (sc->type == MD_VNODE || 1840 (sc->type == MD_PRELOAD && mdr->md_file != NULL)) 1841 error = copyout(sc->file, mdr->md_file, 1842 strlen(sc->file) + 1); 1843 return (error); 1844 } 1845 1846 static int 1847 kern_mdquery(struct md_req *mdr) 1848 { 1849 int error; 1850 1851 sx_xlock(&md_sx); 1852 error = kern_mdquery_locked(mdr); 1853 sx_xunlock(&md_sx); 1854 return (error); 1855 } 1856 1857 /* Copy members that are not userspace pointers. */ 1858 #define MD_IOCTL2REQ(mdio, mdr) do { \ 1859 (mdr)->md_unit = (mdio)->md_unit; \ 1860 (mdr)->md_type = (mdio)->md_type; \ 1861 (mdr)->md_mediasize = (mdio)->md_mediasize; \ 1862 (mdr)->md_sectorsize = (mdio)->md_sectorsize; \ 1863 (mdr)->md_options = (mdio)->md_options; \ 1864 (mdr)->md_fwheads = (mdio)->md_fwheads; \ 1865 (mdr)->md_fwsectors = (mdio)->md_fwsectors; \ 1866 (mdr)->md_units = &(mdio)->md_pad[0]; \ 1867 (mdr)->md_units_nitems = nitems((mdio)->md_pad); \ 1868 } while(0) 1869 1870 /* Copy members that might have been updated */ 1871 #define MD_REQ2IOCTL(mdr, mdio) do { \ 1872 (mdio)->md_unit = (mdr)->md_unit; \ 1873 (mdio)->md_type = (mdr)->md_type; \ 1874 (mdio)->md_mediasize = (mdr)->md_mediasize; \ 1875 (mdio)->md_sectorsize = (mdr)->md_sectorsize; \ 1876 (mdio)->md_options = (mdr)->md_options; \ 1877 (mdio)->md_fwheads = (mdr)->md_fwheads; \ 1878 (mdio)->md_fwsectors = (mdr)->md_fwsectors; \ 1879 } while(0) 1880 1881 static int 1882 mdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, 1883 struct thread *td) 1884 { 1885 struct md_req mdr; 1886 int error; 1887 1888 if (md_debug) 1889 printf("mdctlioctl(%s %lx %p %x %p)\n", 1890 devtoname(dev), cmd, addr, flags, td); 1891 1892 bzero(&mdr, sizeof(mdr)); 1893 switch (cmd) { 1894 case MDIOCATTACH: 1895 case MDIOCDETACH: 1896 case MDIOCRESIZE: 1897 case MDIOCQUERY: { 1898 struct md_ioctl *mdio = (struct md_ioctl *)addr; 1899 if (mdio->md_version != MDIOVERSION) 1900 return (EINVAL); 1901 MD_IOCTL2REQ(mdio, &mdr); 1902 mdr.md_file = mdio->md_file; 1903 mdr.md_file_seg = UIO_USERSPACE; 1904 /* If the file is adjacent to the md_ioctl it's in kernel. */ 1905 if ((void *)mdio->md_file == (void *)(mdio + 1)) 1906 mdr.md_file_seg = UIO_SYSSPACE; 1907 mdr.md_label = mdio->md_label; 1908 break; 1909 } 1910 #ifdef COMPAT_FREEBSD32 1911 case MDIOCATTACH_32: 1912 case MDIOCDETACH_32: 1913 case MDIOCRESIZE_32: 1914 case MDIOCQUERY_32: { 1915 struct md_ioctl32 *mdio = (struct md_ioctl32 *)addr; 1916 if (mdio->md_version != MDIOVERSION) 1917 return (EINVAL); 1918 MD_IOCTL2REQ(mdio, &mdr); 1919 mdr.md_file = (void *)(uintptr_t)mdio->md_file; 1920 mdr.md_file_seg = UIO_USERSPACE; 1921 mdr.md_label = (void *)(uintptr_t)mdio->md_label; 1922 break; 1923 } 1924 #endif 1925 default: 1926 /* Fall through to handler switch. */ 1927 break; 1928 } 1929 1930 error = 0; 1931 switch (cmd) { 1932 case MDIOCATTACH: 1933 #ifdef COMPAT_FREEBSD32 1934 case MDIOCATTACH_32: 1935 #endif 1936 error = kern_mdattach(td, &mdr); 1937 break; 1938 case MDIOCDETACH: 1939 #ifdef COMPAT_FREEBSD32 1940 case MDIOCDETACH_32: 1941 #endif 1942 error = kern_mddetach(td, &mdr); 1943 break; 1944 case MDIOCRESIZE: 1945 #ifdef COMPAT_FREEBSD32 1946 case MDIOCRESIZE_32: 1947 #endif 1948 error = kern_mdresize(&mdr); 1949 break; 1950 case MDIOCQUERY: 1951 #ifdef COMPAT_FREEBSD32 1952 case MDIOCQUERY_32: 1953 #endif 1954 error = kern_mdquery(&mdr); 1955 break; 1956 default: 1957 error = ENOIOCTL; 1958 } 1959 1960 switch (cmd) { 1961 case MDIOCATTACH: 1962 case MDIOCQUERY: { 1963 struct md_ioctl *mdio = (struct md_ioctl *)addr; 1964 MD_REQ2IOCTL(&mdr, mdio); 1965 break; 1966 } 1967 #ifdef COMPAT_FREEBSD32 1968 case MDIOCATTACH_32: 1969 case MDIOCQUERY_32: { 1970 struct md_ioctl32 *mdio = (struct md_ioctl32 *)addr; 1971 MD_REQ2IOCTL(&mdr, mdio); 1972 break; 1973 } 1974 #endif 1975 default: 1976 /* Other commands to not alter mdr. */ 1977 break; 1978 } 1979 1980 return (error); 1981 } 1982 1983 static void 1984 md_preloaded(u_char *image, size_t length, const char *name) 1985 { 1986 struct md_s *sc; 1987 int error; 1988 1989 sc = mdnew(-1, &error, MD_PRELOAD); 1990 if (sc == NULL) 1991 return; 1992 sc->mediasize = length; 1993 sc->sectorsize = DEV_BSIZE; 1994 sc->pl_ptr = image; 1995 sc->pl_len = length; 1996 sc->start = mdstart_preload; 1997 if (name != NULL) 1998 strlcpy(sc->file, name, sizeof(sc->file)); 1999 #ifdef MD_ROOT 2000 if (sc->unit == 0) { 2001 #ifndef ROOTDEVNAME 2002 rootdevnames[0] = MD_ROOT_FSTYPE ":/dev/md0"; 2003 #endif 2004 #ifdef MD_ROOT_READONLY 2005 sc->flags |= MD_READONLY; 2006 #endif 2007 } 2008 #endif 2009 mdinit(sc); 2010 if (name != NULL) { 2011 printf("%s%d: Preloaded image <%s> %zd bytes at %p\n", 2012 MD_NAME, sc->unit, name, length, image); 2013 } else { 2014 printf("%s%d: Embedded image %zd bytes at %p\n", 2015 MD_NAME, sc->unit, length, image); 2016 } 2017 } 2018 2019 static void 2020 g_md_init(struct g_class *mp __unused) 2021 { 2022 caddr_t mod; 2023 u_char *ptr, *name, *type; 2024 unsigned len; 2025 int i; 2026 2027 /* figure out log2(NINDIR) */ 2028 for (i = NINDIR, nshift = -1; i; nshift++) 2029 i >>= 1; 2030 2031 mod = NULL; 2032 sx_init(&md_sx, "MD config lock"); 2033 g_topology_unlock(); 2034 md_uh = new_unrhdr(0, INT_MAX, NULL); 2035 #ifdef MD_ROOT 2036 if (mfs_root_size != 0) { 2037 sx_xlock(&md_sx); 2038 #ifdef MD_ROOT_MEM 2039 md_preloaded(mfs_root, mfs_root_size, NULL); 2040 #else 2041 md_preloaded(__DEVOLATILE(u_char *, &mfs_root), mfs_root_size, 2042 NULL); 2043 #endif 2044 sx_xunlock(&md_sx); 2045 } 2046 #endif 2047 /* XXX: are preload_* static or do they need Giant ? */ 2048 while ((mod = preload_search_next_name(mod)) != NULL) { 2049 name = (char *)preload_search_info(mod, MODINFO_NAME); 2050 if (name == NULL) 2051 continue; 2052 type = (char *)preload_search_info(mod, MODINFO_TYPE); 2053 if (type == NULL) 2054 continue; 2055 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 2056 continue; 2057 ptr = preload_fetch_addr(mod); 2058 len = preload_fetch_size(mod); 2059 if (ptr != NULL && len != 0) { 2060 sx_xlock(&md_sx); 2061 md_preloaded(ptr, len, name); 2062 sx_xunlock(&md_sx); 2063 } 2064 } 2065 md_pbuf_zone = pbuf_zsecond_create("mdpbuf", nswbuf / 10); 2066 status_dev = make_dev(&mdctl_cdevsw, INT_MAX, UID_ROOT, GID_WHEEL, 2067 0600, MDCTL_NAME); 2068 g_topology_lock(); 2069 } 2070 2071 static void 2072 g_md_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 2073 struct g_consumer *cp __unused, struct g_provider *pp) 2074 { 2075 struct md_s *mp; 2076 char *type; 2077 2078 mp = gp->softc; 2079 if (mp == NULL) 2080 return; 2081 2082 switch (mp->type) { 2083 case MD_MALLOC: 2084 type = "malloc"; 2085 break; 2086 case MD_PRELOAD: 2087 type = "preload"; 2088 break; 2089 case MD_VNODE: 2090 type = "vnode"; 2091 break; 2092 case MD_SWAP: 2093 type = "swap"; 2094 break; 2095 case MD_NULL: 2096 type = "null"; 2097 break; 2098 default: 2099 type = "unknown"; 2100 break; 2101 } 2102 2103 if (pp != NULL) { 2104 if (indent == NULL) { 2105 sbuf_printf(sb, " u %d", mp->unit); 2106 sbuf_printf(sb, " s %ju", (uintmax_t) mp->sectorsize); 2107 sbuf_printf(sb, " f %ju", (uintmax_t) mp->fwheads); 2108 sbuf_printf(sb, " fs %ju", (uintmax_t) mp->fwsectors); 2109 sbuf_printf(sb, " l %ju", (uintmax_t) mp->mediasize); 2110 sbuf_printf(sb, " t %s", type); 2111 if ((mp->type == MD_VNODE && mp->vnode != NULL) || 2112 (mp->type == MD_PRELOAD && mp->file[0] != '\0')) 2113 sbuf_printf(sb, " file %s", mp->file); 2114 sbuf_printf(sb, " label %s", mp->label); 2115 } else { 2116 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent, 2117 mp->unit); 2118 sbuf_printf(sb, "%s<sectorsize>%ju</sectorsize>\n", 2119 indent, (uintmax_t) mp->sectorsize); 2120 sbuf_printf(sb, "%s<fwheads>%ju</fwheads>\n", 2121 indent, (uintmax_t) mp->fwheads); 2122 sbuf_printf(sb, "%s<fwsectors>%ju</fwsectors>\n", 2123 indent, (uintmax_t) mp->fwsectors); 2124 if (mp->ident[0] != '\0') { 2125 sbuf_printf(sb, "%s<ident>", indent); 2126 g_conf_printf_escaped(sb, "%s", mp->ident); 2127 sbuf_printf(sb, "</ident>\n"); 2128 } 2129 sbuf_printf(sb, "%s<length>%ju</length>\n", 2130 indent, (uintmax_t) mp->mediasize); 2131 sbuf_printf(sb, "%s<compression>%s</compression>\n", indent, 2132 (mp->flags & MD_COMPRESS) == 0 ? "off": "on"); 2133 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 2134 (mp->flags & MD_READONLY) == 0 ? "read-write": 2135 "read-only"); 2136 sbuf_printf(sb, "%s<type>%s</type>\n", indent, 2137 type); 2138 if ((mp->type == MD_VNODE && mp->vnode != NULL) || 2139 (mp->type == MD_PRELOAD && mp->file[0] != '\0')) { 2140 sbuf_printf(sb, "%s<file>", indent); 2141 g_conf_printf_escaped(sb, "%s", mp->file); 2142 sbuf_printf(sb, "</file>\n"); 2143 } 2144 if (mp->type == MD_VNODE) 2145 sbuf_printf(sb, "%s<cache>%s</cache>\n", indent, 2146 (mp->flags & MD_CACHE) == 0 ? "off": "on"); 2147 sbuf_printf(sb, "%s<label>", indent); 2148 g_conf_printf_escaped(sb, "%s", mp->label); 2149 sbuf_printf(sb, "</label>\n"); 2150 } 2151 } 2152 } 2153 2154 static void 2155 g_md_fini(struct g_class *mp __unused) 2156 { 2157 2158 sx_destroy(&md_sx); 2159 if (status_dev != NULL) 2160 destroy_dev(status_dev); 2161 uma_zdestroy(md_pbuf_zone); 2162 delete_unrhdr(md_uh); 2163 } 2164