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