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/unistd.h> 94 #include <sys/vnode.h> 95 #include <sys/disk.h> 96 97 #include <geom/geom.h> 98 #include <geom/geom_int.h> 99 100 #include <vm/vm.h> 101 #include <vm/vm_param.h> 102 #include <vm/vm_object.h> 103 #include <vm/vm_page.h> 104 #include <vm/vm_pager.h> 105 #include <vm/swap_pager.h> 106 #include <vm/uma.h> 107 108 #include <machine/bus.h> 109 110 #define MD_MODVER 1 111 112 #define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */ 113 #define MD_EXITING 0x20000 /* Worker thread is exiting. */ 114 #define MD_PROVIDERGONE 0x40000 /* Safe to free the softc */ 115 116 #ifndef MD_NSECT 117 #define MD_NSECT (10000 * 2) 118 #endif 119 120 struct md_req { 121 unsigned md_unit; /* unit number */ 122 enum md_types md_type; /* type of disk */ 123 off_t md_mediasize; /* size of disk in bytes */ 124 unsigned md_sectorsize; /* sectorsize */ 125 unsigned md_options; /* options */ 126 int md_fwheads; /* firmware heads */ 127 int md_fwsectors; /* firmware sectors */ 128 char *md_file; /* pathname of file to mount */ 129 enum uio_seg md_file_seg; /* location of md_file */ 130 char *md_label; /* label of the device (userspace) */ 131 int *md_units; /* pointer to units array (kernel) */ 132 size_t md_units_nitems; /* items in md_units array */ 133 }; 134 135 #ifdef COMPAT_FREEBSD32 136 struct md_ioctl32 { 137 unsigned md_version; 138 unsigned md_unit; 139 enum md_types md_type; 140 uint32_t md_file; 141 off_t md_mediasize; 142 unsigned md_sectorsize; 143 unsigned md_options; 144 uint64_t md_base; 145 int md_fwheads; 146 int md_fwsectors; 147 uint32_t md_label; 148 int md_pad[MDNPAD]; 149 } __attribute__((__packed__)); 150 CTASSERT((sizeof(struct md_ioctl32)) == 436); 151 152 #define MDIOCATTACH_32 _IOC_NEWTYPE(MDIOCATTACH, struct md_ioctl32) 153 #define MDIOCDETACH_32 _IOC_NEWTYPE(MDIOCDETACH, struct md_ioctl32) 154 #define MDIOCQUERY_32 _IOC_NEWTYPE(MDIOCQUERY, struct md_ioctl32) 155 #define MDIOCRESIZE_32 _IOC_NEWTYPE(MDIOCRESIZE, struct md_ioctl32) 156 #endif /* COMPAT_FREEBSD32 */ 157 158 static MALLOC_DEFINE(M_MD, "md_disk", "Memory Disk"); 159 static MALLOC_DEFINE(M_MDSECT, "md_sectors", "Memory Disk Sectors"); 160 161 static int md_debug; 162 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, 163 "Enable md(4) debug messages"); 164 static int md_malloc_wait; 165 SYSCTL_INT(_vm, OID_AUTO, md_malloc_wait, CTLFLAG_RW, &md_malloc_wait, 0, 166 "Allow malloc to wait for memory allocations"); 167 168 #if defined(MD_ROOT) && !defined(MD_ROOT_FSTYPE) 169 #define MD_ROOT_FSTYPE "ufs" 170 #endif 171 172 #if defined(MD_ROOT) 173 /* 174 * Preloaded image gets put here. 175 */ 176 #if defined(MD_ROOT_SIZE) 177 /* 178 * We put the mfs_root symbol into the oldmfs section of the kernel object file. 179 * Applications that patch the object with the image can determine 180 * the size looking at the oldmfs section size within the kernel. 181 */ 182 u_char mfs_root[MD_ROOT_SIZE*1024] __attribute__ ((section ("oldmfs"))); 183 const int mfs_root_size = sizeof(mfs_root); 184 #elif defined(MD_ROOT_MEM) 185 /* MD region already mapped in the memory */ 186 u_char *mfs_root; 187 int mfs_root_size; 188 #else 189 extern volatile u_char __weak_symbol mfs_root; 190 extern volatile u_char __weak_symbol mfs_root_end; 191 #define mfs_root_size ((uintptr_t)(&mfs_root_end - &mfs_root)) 192 #endif 193 #endif 194 195 static g_init_t g_md_init; 196 static g_fini_t g_md_fini; 197 static g_start_t g_md_start; 198 static g_access_t g_md_access; 199 static void g_md_dumpconf(struct sbuf *sb, const char *indent, 200 struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp); 201 static g_provgone_t g_md_providergone; 202 203 static struct cdev *status_dev = NULL; 204 static struct sx md_sx; 205 static struct unrhdr *md_uh; 206 207 static d_ioctl_t mdctlioctl; 208 209 static struct cdevsw mdctl_cdevsw = { 210 .d_version = D_VERSION, 211 .d_ioctl = mdctlioctl, 212 .d_name = MD_NAME, 213 }; 214 215 struct g_class g_md_class = { 216 .name = "MD", 217 .version = G_VERSION, 218 .init = g_md_init, 219 .fini = g_md_fini, 220 .start = g_md_start, 221 .access = g_md_access, 222 .dumpconf = g_md_dumpconf, 223 .providergone = g_md_providergone, 224 }; 225 226 DECLARE_GEOM_CLASS(g_md_class, g_md); 227 228 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(md_softc_list); 229 230 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 231 #define NMASK (NINDIR-1) 232 static int nshift; 233 234 static uma_zone_t md_pbuf_zone; 235 236 struct indir { 237 uintptr_t *array; 238 u_int total; 239 u_int used; 240 u_int shift; 241 }; 242 243 struct md_s { 244 int unit; 245 LIST_ENTRY(md_s) list; 246 struct bio_queue_head bio_queue; 247 struct mtx queue_mtx; 248 struct cdev *dev; 249 enum md_types type; 250 off_t mediasize; 251 unsigned sectorsize; 252 unsigned opencount; 253 unsigned fwheads; 254 unsigned fwsectors; 255 char ident[32]; 256 unsigned flags; 257 char name[20]; 258 struct proc *procp; 259 struct g_geom *gp; 260 struct g_provider *pp; 261 int (*start)(struct md_s *sc, struct bio *bp); 262 struct devstat *devstat; 263 bool candelete; 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, off, len; 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 auio.uio_rw = UIO_WRITE; 889 break; 890 case BIO_FLUSH: 891 break; 892 case BIO_DELETE: 893 if (sc->candelete) 894 break; 895 /* FALLTHROUGH */ 896 default: 897 return (EOPNOTSUPP); 898 } 899 900 td = curthread; 901 vp = sc->vnode; 902 pb = NULL; 903 piov = NULL; 904 ma_offs = bp->bio_ma_offset; 905 off = bp->bio_offset; 906 len = bp->bio_length; 907 908 /* 909 * VNODE I/O 910 * 911 * If an error occurs, we set BIO_ERROR but we do not set 912 * B_INVAL because (for a write anyway), the buffer is 913 * still valid. 914 */ 915 916 if (bp->bio_cmd == BIO_FLUSH) { 917 (void) vn_start_write(vp, &mp, V_WAIT); 918 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 919 error = VOP_FSYNC(vp, MNT_WAIT, td); 920 VOP_UNLOCK(vp); 921 vn_finished_write(mp); 922 return (error); 923 } else if (bp->bio_cmd == BIO_DELETE) { 924 error = vn_deallocate(vp, &off, &len, 0, 925 sc->flags & MD_ASYNC ? 0 : IO_SYNC, sc->cred, NOCRED); 926 bp->bio_resid = len; 927 return (error); 928 } 929 930 auio.uio_offset = (vm_ooffset_t)bp->bio_offset; 931 auio.uio_resid = bp->bio_length; 932 auio.uio_segflg = UIO_SYSSPACE; 933 auio.uio_td = td; 934 935 if ((bp->bio_flags & BIO_VLIST) != 0) { 936 piov = malloc(sizeof(*piov) * bp->bio_ma_n, M_MD, M_WAITOK); 937 auio.uio_iov = piov; 938 vlist = (bus_dma_segment_t *)bp->bio_data; 939 while (len > 0) { 940 piov->iov_base = (void *)(uintptr_t)(vlist->ds_addr + 941 ma_offs); 942 piov->iov_len = vlist->ds_len - ma_offs; 943 if (piov->iov_len > len) 944 piov->iov_len = len; 945 len -= piov->iov_len; 946 ma_offs = 0; 947 vlist++; 948 piov++; 949 } 950 auio.uio_iovcnt = piov - auio.uio_iov; 951 piov = auio.uio_iov; 952 } else if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 953 pb = uma_zalloc(md_pbuf_zone, M_WAITOK); 954 MPASS((pb->b_flags & B_MAXPHYS) != 0); 955 bp->bio_resid = len; 956 unmapped_step: 957 npages = atop(min(maxphys, round_page(len + (ma_offs & 958 PAGE_MASK)))); 959 iolen = min(ptoa(npages) - (ma_offs & PAGE_MASK), len); 960 KASSERT(iolen > 0, ("zero iolen")); 961 pmap_qenter((vm_offset_t)pb->b_data, 962 &bp->bio_ma[atop(ma_offs)], npages); 963 aiov.iov_base = (void *)((vm_offset_t)pb->b_data + 964 (ma_offs & PAGE_MASK)); 965 aiov.iov_len = iolen; 966 auio.uio_iov = &aiov; 967 auio.uio_iovcnt = 1; 968 auio.uio_resid = iolen; 969 } else { 970 aiov.iov_base = bp->bio_data; 971 aiov.iov_len = bp->bio_length; 972 auio.uio_iov = &aiov; 973 auio.uio_iovcnt = 1; 974 } 975 iostart = auio.uio_offset; 976 if (auio.uio_rw == UIO_READ) { 977 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 978 error = VOP_READ(vp, &auio, 0, sc->cred); 979 VOP_UNLOCK(vp); 980 } else { 981 (void) vn_start_write(vp, &mp, V_WAIT); 982 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 983 error = VOP_WRITE(vp, &auio, sc->flags & MD_ASYNC ? 0 : IO_SYNC, 984 sc->cred); 985 VOP_UNLOCK(vp); 986 vn_finished_write(mp); 987 if (error == 0) 988 sc->flags &= ~MD_VERIFY; 989 } 990 991 /* When MD_CACHE is set, try to avoid double-caching the data. */ 992 if (error == 0 && (sc->flags & MD_CACHE) == 0) 993 VOP_ADVISE(vp, iostart, auio.uio_offset - 1, 994 POSIX_FADV_DONTNEED); 995 996 if (pb != NULL) { 997 pmap_qremove((vm_offset_t)pb->b_data, npages); 998 if (error == 0) { 999 len -= iolen; 1000 bp->bio_resid -= iolen; 1001 ma_offs += iolen; 1002 if (len > 0) 1003 goto unmapped_step; 1004 } 1005 uma_zfree(md_pbuf_zone, pb); 1006 } else { 1007 bp->bio_resid = auio.uio_resid; 1008 } 1009 1010 free(piov, M_MD); 1011 return (error); 1012 } 1013 1014 static int 1015 mdstart_swap(struct md_s *sc, struct bio *bp) 1016 { 1017 vm_page_t m; 1018 u_char *p; 1019 vm_pindex_t i, lastp; 1020 bus_dma_segment_t *vlist; 1021 int rv, ma_offs, offs, len, lastend; 1022 1023 switch (bp->bio_cmd) { 1024 case BIO_READ: 1025 case BIO_WRITE: 1026 case BIO_DELETE: 1027 break; 1028 default: 1029 return (EOPNOTSUPP); 1030 } 1031 1032 p = bp->bio_data; 1033 ma_offs = (bp->bio_flags & (BIO_UNMAPPED|BIO_VLIST)) != 0 ? 1034 bp->bio_ma_offset : 0; 1035 vlist = (bp->bio_flags & BIO_VLIST) != 0 ? 1036 (bus_dma_segment_t *)bp->bio_data : NULL; 1037 1038 /* 1039 * offs is the offset at which to start operating on the 1040 * next (ie, first) page. lastp is the last page on 1041 * which we're going to operate. lastend is the ending 1042 * position within that last page (ie, PAGE_SIZE if 1043 * we're operating on complete aligned pages). 1044 */ 1045 offs = bp->bio_offset % PAGE_SIZE; 1046 lastp = (bp->bio_offset + bp->bio_length - 1) / PAGE_SIZE; 1047 lastend = (bp->bio_offset + bp->bio_length - 1) % PAGE_SIZE + 1; 1048 1049 rv = VM_PAGER_OK; 1050 vm_object_pip_add(sc->object, 1); 1051 for (i = bp->bio_offset / PAGE_SIZE; i <= lastp; i++) { 1052 len = ((i == lastp) ? lastend : PAGE_SIZE) - offs; 1053 m = vm_page_grab_unlocked(sc->object, i, VM_ALLOC_SYSTEM); 1054 if (bp->bio_cmd == BIO_READ) { 1055 if (vm_page_all_valid(m)) 1056 rv = VM_PAGER_OK; 1057 else 1058 rv = vm_pager_get_pages(sc->object, &m, 1, 1059 NULL, NULL); 1060 if (rv == VM_PAGER_ERROR) { 1061 VM_OBJECT_WLOCK(sc->object); 1062 vm_page_free(m); 1063 VM_OBJECT_WUNLOCK(sc->object); 1064 break; 1065 } else if (rv == VM_PAGER_FAIL) { 1066 /* 1067 * Pager does not have the page. Zero 1068 * the allocated page, and mark it as 1069 * valid. Do not set dirty, the page 1070 * can be recreated if thrown out. 1071 */ 1072 pmap_zero_page(m); 1073 vm_page_valid(m); 1074 } 1075 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 1076 pmap_copy_pages(&m, offs, bp->bio_ma, 1077 ma_offs, len); 1078 } else if ((bp->bio_flags & BIO_VLIST) != 0) { 1079 physcopyout_vlist(VM_PAGE_TO_PHYS(m) + offs, 1080 vlist, ma_offs, len); 1081 cpu_flush_dcache(p, len); 1082 } else { 1083 physcopyout(VM_PAGE_TO_PHYS(m) + offs, p, len); 1084 cpu_flush_dcache(p, len); 1085 } 1086 } else if (bp->bio_cmd == BIO_WRITE) { 1087 if (len == PAGE_SIZE || vm_page_all_valid(m)) 1088 rv = VM_PAGER_OK; 1089 else 1090 rv = vm_pager_get_pages(sc->object, &m, 1, 1091 NULL, NULL); 1092 if (rv == VM_PAGER_ERROR) { 1093 VM_OBJECT_WLOCK(sc->object); 1094 vm_page_free(m); 1095 VM_OBJECT_WUNLOCK(sc->object); 1096 break; 1097 } else if (rv == VM_PAGER_FAIL) 1098 pmap_zero_page(m); 1099 1100 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 1101 pmap_copy_pages(bp->bio_ma, ma_offs, &m, 1102 offs, len); 1103 } else if ((bp->bio_flags & BIO_VLIST) != 0) { 1104 physcopyin_vlist(vlist, ma_offs, 1105 VM_PAGE_TO_PHYS(m) + offs, len); 1106 } else { 1107 physcopyin(p, VM_PAGE_TO_PHYS(m) + offs, len); 1108 } 1109 1110 vm_page_valid(m); 1111 vm_page_set_dirty(m); 1112 } else if (bp->bio_cmd == BIO_DELETE) { 1113 if (len == PAGE_SIZE || vm_page_all_valid(m)) 1114 rv = VM_PAGER_OK; 1115 else 1116 rv = vm_pager_get_pages(sc->object, &m, 1, 1117 NULL, NULL); 1118 VM_OBJECT_WLOCK(sc->object); 1119 if (rv == VM_PAGER_ERROR) { 1120 vm_page_free(m); 1121 VM_OBJECT_WUNLOCK(sc->object); 1122 break; 1123 } else if (rv == VM_PAGER_FAIL) { 1124 vm_page_free(m); 1125 m = NULL; 1126 } else { 1127 /* Page is valid. */ 1128 if (len != PAGE_SIZE) { 1129 pmap_zero_page_area(m, offs, len); 1130 vm_page_set_dirty(m); 1131 } else { 1132 vm_pager_page_unswapped(m); 1133 vm_page_free(m); 1134 m = NULL; 1135 } 1136 } 1137 VM_OBJECT_WUNLOCK(sc->object); 1138 } 1139 if (m != NULL) { 1140 /* 1141 * The page may be deactivated prior to setting 1142 * PGA_REFERENCED, but in this case it will be 1143 * reactivated by the page daemon. 1144 */ 1145 if (vm_page_active(m)) 1146 vm_page_reference(m); 1147 else 1148 vm_page_activate(m); 1149 vm_page_xunbusy(m); 1150 } 1151 1152 /* Actions on further pages start at offset 0 */ 1153 p += PAGE_SIZE - offs; 1154 offs = 0; 1155 ma_offs += len; 1156 } 1157 vm_object_pip_wakeup(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_handleattr(struct md_s *sc, struct bio *bp) 1179 { 1180 if (sc->fwsectors && sc->fwheads && 1181 (g_handleattr_int(bp, "GEOM::fwsectors", sc->fwsectors) != 0 || 1182 g_handleattr_int(bp, "GEOM::fwheads", sc->fwheads) != 0)) 1183 return; 1184 if (g_handleattr_int(bp, "GEOM::candelete", sc->candelete) != 0) 1185 return; 1186 if (sc->ident[0] != '\0' && 1187 g_handleattr_str(bp, "GEOM::ident", sc->ident) != 0) 1188 return; 1189 if (g_handleattr_int(bp, "MNT::verified", (sc->flags & MD_VERIFY) != 0)) 1190 return; 1191 g_io_deliver(bp, EOPNOTSUPP); 1192 } 1193 1194 static void 1195 md_kthread(void *arg) 1196 { 1197 struct md_s *sc; 1198 struct bio *bp; 1199 int error; 1200 1201 sc = arg; 1202 thread_lock(curthread); 1203 sched_prio(curthread, PRIBIO); 1204 thread_unlock(curthread); 1205 if (sc->type == MD_VNODE) 1206 curthread->td_pflags |= TDP_NORUNNINGBUF; 1207 1208 for (;;) { 1209 mtx_lock(&sc->queue_mtx); 1210 if (sc->flags & MD_SHUTDOWN) { 1211 sc->flags |= MD_EXITING; 1212 mtx_unlock(&sc->queue_mtx); 1213 kproc_exit(0); 1214 } 1215 bp = bioq_takefirst(&sc->bio_queue); 1216 if (!bp) { 1217 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 1218 continue; 1219 } 1220 mtx_unlock(&sc->queue_mtx); 1221 if (bp->bio_cmd == BIO_GETATTR) { 1222 md_handleattr(sc, bp); 1223 } else { 1224 error = sc->start(sc, bp); 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 1229 * of the i/o. g_io_deliver() will translate 1230 * from bio_completed to that, but it also 1231 * destroys the bio so we must do our own 1232 * translation. 1233 */ 1234 bp->bio_bcount = bp->bio_length; 1235 devstat_end_transaction_bio(sc->devstat, bp); 1236 } 1237 bp->bio_completed = bp->bio_length - bp->bio_resid; 1238 g_io_deliver(bp, error); 1239 } 1240 } 1241 } 1242 1243 static struct md_s * 1244 mdfind(int unit) 1245 { 1246 struct md_s *sc; 1247 1248 LIST_FOREACH(sc, &md_softc_list, list) { 1249 if (sc->unit == unit) 1250 break; 1251 } 1252 return (sc); 1253 } 1254 1255 static struct md_s * 1256 mdnew(int unit, int *errp, enum md_types type) 1257 { 1258 struct md_s *sc; 1259 int error; 1260 1261 *errp = 0; 1262 if (unit == -1) 1263 unit = alloc_unr(md_uh); 1264 else 1265 unit = alloc_unr_specific(md_uh, unit); 1266 1267 if (unit == -1) { 1268 *errp = EBUSY; 1269 return (NULL); 1270 } 1271 1272 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 1273 sc->type = type; 1274 bioq_init(&sc->bio_queue); 1275 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 1276 sc->unit = unit; 1277 sprintf(sc->name, "md%d", unit); 1278 LIST_INSERT_HEAD(&md_softc_list, sc, list); 1279 error = kproc_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 1280 if (error == 0) 1281 return (sc); 1282 LIST_REMOVE(sc, list); 1283 mtx_destroy(&sc->queue_mtx); 1284 free_unr(md_uh, sc->unit); 1285 free(sc, M_MD); 1286 *errp = error; 1287 return (NULL); 1288 } 1289 1290 static void 1291 mdinit(struct md_s *sc) 1292 { 1293 struct g_geom *gp; 1294 struct g_provider *pp; 1295 1296 g_topology_lock(); 1297 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 1298 gp->softc = sc; 1299 pp = g_new_providerf(gp, "md%d", sc->unit); 1300 devstat_remove_entry(pp->stat); 1301 pp->stat = NULL; 1302 pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE; 1303 pp->mediasize = sc->mediasize; 1304 pp->sectorsize = sc->sectorsize; 1305 switch (sc->type) { 1306 case MD_MALLOC: 1307 case MD_VNODE: 1308 case MD_SWAP: 1309 pp->flags |= G_PF_ACCEPT_UNMAPPED; 1310 break; 1311 case MD_PRELOAD: 1312 case MD_NULL: 1313 break; 1314 } 1315 sc->gp = gp; 1316 sc->pp = pp; 1317 sc->devstat = devstat_new_entry("md", sc->unit, sc->sectorsize, 1318 DEVSTAT_ALL_SUPPORTED, DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 1319 sc->devstat->id = pp; 1320 g_error_provider(pp, 0); 1321 g_topology_unlock(); 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 static int 1366 mdsetcred(struct md_s *sc, struct ucred *cred) 1367 { 1368 char *tmpbuf; 1369 int error = 0; 1370 1371 /* 1372 * Set credits in our softc 1373 */ 1374 1375 if (sc->cred) 1376 crfree(sc->cred); 1377 sc->cred = crhold(cred); 1378 1379 /* 1380 * Horrible kludge to establish credentials for NFS XXX. 1381 */ 1382 1383 if (sc->vnode) { 1384 struct uio auio; 1385 struct iovec aiov; 1386 1387 tmpbuf = malloc(sc->sectorsize, M_TEMP, M_WAITOK); 1388 bzero(&auio, sizeof(auio)); 1389 1390 aiov.iov_base = tmpbuf; 1391 aiov.iov_len = sc->sectorsize; 1392 auio.uio_iov = &aiov; 1393 auio.uio_iovcnt = 1; 1394 auio.uio_offset = 0; 1395 auio.uio_rw = UIO_READ; 1396 auio.uio_segflg = UIO_SYSSPACE; 1397 auio.uio_resid = aiov.iov_len; 1398 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY); 1399 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 1400 VOP_UNLOCK(sc->vnode); 1401 free(tmpbuf, M_TEMP); 1402 } 1403 return (error); 1404 } 1405 1406 static int 1407 mdcreate_vnode(struct md_s *sc, struct md_req *mdr, struct thread *td) 1408 { 1409 struct vattr vattr; 1410 struct nameidata nd; 1411 char *fname; 1412 int error, flags; 1413 long v; 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 ((mdr->md_options & MD_MUSTDEALLOC) != 0) { 1444 error = VOP_PATHCONF(nd.ni_vp, _PC_DEALLOC_PRESENT, &v); 1445 if (error != 0) 1446 goto bad; 1447 if (v == 0) 1448 sc->candelete = false; 1449 } 1450 if (VOP_ISLOCKED(nd.ni_vp) != LK_EXCLUSIVE) { 1451 vn_lock(nd.ni_vp, LK_UPGRADE | LK_RETRY); 1452 if (VN_IS_DOOMED(nd.ni_vp)) { 1453 /* Forced unmount. */ 1454 error = EBADF; 1455 goto bad; 1456 } 1457 } 1458 nd.ni_vp->v_vflag |= VV_MD; 1459 VOP_UNLOCK(nd.ni_vp); 1460 1461 if (mdr->md_fwsectors != 0) 1462 sc->fwsectors = mdr->md_fwsectors; 1463 if (mdr->md_fwheads != 0) 1464 sc->fwheads = mdr->md_fwheads; 1465 snprintf(sc->ident, sizeof(sc->ident), "MD-DEV%ju-INO%ju", 1466 (uintmax_t)vattr.va_fsid, (uintmax_t)vattr.va_fileid); 1467 sc->flags = mdr->md_options & (MD_ASYNC | MD_CACHE | MD_FORCE | 1468 MD_VERIFY); 1469 if (!(flags & FWRITE)) 1470 sc->flags |= MD_READONLY; 1471 sc->vnode = nd.ni_vp; 1472 1473 error = mdsetcred(sc, td->td_ucred); 1474 if (error != 0) { 1475 sc->vnode = NULL; 1476 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY); 1477 nd.ni_vp->v_vflag &= ~VV_MD; 1478 goto bad; 1479 } 1480 return (0); 1481 bad: 1482 VOP_UNLOCK(nd.ni_vp); 1483 (void)vn_close(nd.ni_vp, flags, td->td_ucred, td); 1484 return (error); 1485 } 1486 1487 static void 1488 g_md_providergone(struct g_provider *pp) 1489 { 1490 struct md_s *sc = pp->geom->softc; 1491 1492 mtx_lock(&sc->queue_mtx); 1493 sc->flags |= MD_PROVIDERGONE; 1494 wakeup(&sc->flags); 1495 mtx_unlock(&sc->queue_mtx); 1496 } 1497 1498 static int 1499 mddestroy(struct md_s *sc, struct thread *td) 1500 { 1501 1502 if (sc->gp) { 1503 g_topology_lock(); 1504 g_wither_geom(sc->gp, ENXIO); 1505 g_topology_unlock(); 1506 1507 mtx_lock(&sc->queue_mtx); 1508 while (!(sc->flags & MD_PROVIDERGONE)) 1509 msleep(&sc->flags, &sc->queue_mtx, PRIBIO, "mddestroy", 0); 1510 mtx_unlock(&sc->queue_mtx); 1511 } 1512 if (sc->devstat) { 1513 devstat_remove_entry(sc->devstat); 1514 sc->devstat = NULL; 1515 } 1516 mtx_lock(&sc->queue_mtx); 1517 sc->flags |= MD_SHUTDOWN; 1518 wakeup(sc); 1519 while (!(sc->flags & MD_EXITING)) 1520 msleep(sc->procp, &sc->queue_mtx, PRIBIO, "mddestroy", hz / 10); 1521 mtx_unlock(&sc->queue_mtx); 1522 mtx_destroy(&sc->queue_mtx); 1523 if (sc->vnode != NULL) { 1524 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY); 1525 sc->vnode->v_vflag &= ~VV_MD; 1526 VOP_UNLOCK(sc->vnode); 1527 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 1528 FREAD : (FREAD|FWRITE), sc->cred, td); 1529 } 1530 if (sc->cred != NULL) 1531 crfree(sc->cred); 1532 if (sc->object != NULL) 1533 vm_object_deallocate(sc->object); 1534 if (sc->indir) 1535 destroy_indir(sc, sc->indir); 1536 if (sc->uma) 1537 uma_zdestroy(sc->uma); 1538 1539 LIST_REMOVE(sc, list); 1540 free_unr(md_uh, sc->unit); 1541 free(sc, M_MD); 1542 return (0); 1543 } 1544 1545 static int 1546 mdresize(struct md_s *sc, struct md_req *mdr) 1547 { 1548 int error, res; 1549 vm_pindex_t oldpages, newpages; 1550 1551 switch (sc->type) { 1552 case MD_VNODE: 1553 case MD_NULL: 1554 break; 1555 case MD_SWAP: 1556 if (mdr->md_mediasize <= 0 || 1557 (mdr->md_mediasize % PAGE_SIZE) != 0) 1558 return (EDOM); 1559 oldpages = OFF_TO_IDX(sc->mediasize); 1560 newpages = OFF_TO_IDX(mdr->md_mediasize); 1561 if (newpages < oldpages) { 1562 VM_OBJECT_WLOCK(sc->object); 1563 vm_object_page_remove(sc->object, newpages, 0, 0); 1564 swap_release_by_cred(IDX_TO_OFF(oldpages - 1565 newpages), sc->cred); 1566 sc->object->charge = IDX_TO_OFF(newpages); 1567 sc->object->size = newpages; 1568 VM_OBJECT_WUNLOCK(sc->object); 1569 } else if (newpages > oldpages) { 1570 res = swap_reserve_by_cred(IDX_TO_OFF(newpages - 1571 oldpages), sc->cred); 1572 if (!res) 1573 return (ENOMEM); 1574 if ((mdr->md_options & MD_RESERVE) || 1575 (sc->flags & MD_RESERVE)) { 1576 error = swap_pager_reserve(sc->object, 1577 oldpages, newpages - oldpages); 1578 if (error < 0) { 1579 swap_release_by_cred( 1580 IDX_TO_OFF(newpages - oldpages), 1581 sc->cred); 1582 return (EDOM); 1583 } 1584 } 1585 VM_OBJECT_WLOCK(sc->object); 1586 sc->object->charge = IDX_TO_OFF(newpages); 1587 sc->object->size = newpages; 1588 VM_OBJECT_WUNLOCK(sc->object); 1589 } 1590 break; 1591 default: 1592 return (EOPNOTSUPP); 1593 } 1594 1595 sc->mediasize = mdr->md_mediasize; 1596 1597 g_topology_lock(); 1598 g_resize_provider(sc->pp, sc->mediasize); 1599 g_topology_unlock(); 1600 return (0); 1601 } 1602 1603 static int 1604 mdcreate_swap(struct md_s *sc, struct md_req *mdr, struct thread *td) 1605 { 1606 vm_ooffset_t npage; 1607 int error; 1608 1609 /* 1610 * Range check. Disallow negative sizes and sizes not being 1611 * multiple of page size. 1612 */ 1613 if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0) 1614 return (EDOM); 1615 1616 /* 1617 * Allocate an OBJT_SWAP object. 1618 * 1619 * Note the truncation. 1620 */ 1621 1622 if ((mdr->md_options & MD_VERIFY) != 0) 1623 return (EINVAL); 1624 npage = mdr->md_mediasize / PAGE_SIZE; 1625 if (mdr->md_fwsectors != 0) 1626 sc->fwsectors = mdr->md_fwsectors; 1627 if (mdr->md_fwheads != 0) 1628 sc->fwheads = mdr->md_fwheads; 1629 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * npage, 1630 VM_PROT_DEFAULT, 0, td->td_ucred); 1631 if (sc->object == NULL) 1632 return (ENOMEM); 1633 sc->flags = mdr->md_options & (MD_FORCE | MD_RESERVE); 1634 if (mdr->md_options & MD_RESERVE) { 1635 if (swap_pager_reserve(sc->object, 0, npage) < 0) { 1636 error = EDOM; 1637 goto finish; 1638 } 1639 } 1640 error = mdsetcred(sc, td->td_ucred); 1641 finish: 1642 if (error != 0) { 1643 vm_object_deallocate(sc->object); 1644 sc->object = NULL; 1645 } 1646 return (error); 1647 } 1648 1649 static int 1650 mdcreate_null(struct md_s *sc, struct md_req *mdr, struct thread *td) 1651 { 1652 1653 /* 1654 * Range check. Disallow negative sizes and sizes not being 1655 * multiple of page size. 1656 */ 1657 if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0) 1658 return (EDOM); 1659 1660 return (0); 1661 } 1662 1663 static int 1664 kern_mdattach_locked(struct thread *td, struct md_req *mdr) 1665 { 1666 struct md_s *sc; 1667 unsigned sectsize; 1668 int error, i; 1669 1670 sx_assert(&md_sx, SA_XLOCKED); 1671 1672 switch (mdr->md_type) { 1673 case MD_MALLOC: 1674 case MD_PRELOAD: 1675 case MD_VNODE: 1676 case MD_SWAP: 1677 case MD_NULL: 1678 break; 1679 default: 1680 return (EINVAL); 1681 } 1682 if (mdr->md_sectorsize == 0) 1683 sectsize = DEV_BSIZE; 1684 else 1685 sectsize = mdr->md_sectorsize; 1686 if (sectsize > maxphys || mdr->md_mediasize < sectsize) 1687 return (EINVAL); 1688 if (mdr->md_options & MD_AUTOUNIT) 1689 sc = mdnew(-1, &error, mdr->md_type); 1690 else { 1691 if (mdr->md_unit > INT_MAX) 1692 return (EINVAL); 1693 sc = mdnew(mdr->md_unit, &error, mdr->md_type); 1694 } 1695 if (sc == NULL) 1696 return (error); 1697 if (mdr->md_label != NULL) 1698 error = copyinstr(mdr->md_label, sc->label, 1699 sizeof(sc->label), NULL); 1700 if (error != 0) 1701 goto err_after_new; 1702 if (mdr->md_options & MD_AUTOUNIT) 1703 mdr->md_unit = sc->unit; 1704 sc->mediasize = mdr->md_mediasize; 1705 sc->sectorsize = sectsize; 1706 sc->candelete = true; 1707 error = EDOOFUS; 1708 switch (sc->type) { 1709 case MD_MALLOC: 1710 sc->start = mdstart_malloc; 1711 error = mdcreate_malloc(sc, mdr); 1712 break; 1713 case MD_PRELOAD: 1714 /* 1715 * We disallow attaching preloaded memory disks via 1716 * ioctl. Preloaded memory disks are automatically 1717 * attached in g_md_init(). 1718 */ 1719 error = EOPNOTSUPP; 1720 break; 1721 case MD_VNODE: 1722 sc->start = mdstart_vnode; 1723 error = mdcreate_vnode(sc, mdr, td); 1724 break; 1725 case MD_SWAP: 1726 sc->start = mdstart_swap; 1727 error = mdcreate_swap(sc, mdr, td); 1728 break; 1729 case MD_NULL: 1730 sc->start = mdstart_null; 1731 error = mdcreate_null(sc, mdr, td); 1732 break; 1733 } 1734 err_after_new: 1735 if (error != 0) { 1736 mddestroy(sc, td); 1737 return (error); 1738 } 1739 1740 /* Prune off any residual fractional sector */ 1741 i = sc->mediasize % sc->sectorsize; 1742 sc->mediasize -= i; 1743 1744 mdinit(sc); 1745 return (0); 1746 } 1747 1748 static int 1749 kern_mdattach(struct thread *td, struct md_req *mdr) 1750 { 1751 int error; 1752 1753 sx_xlock(&md_sx); 1754 error = kern_mdattach_locked(td, mdr); 1755 sx_xunlock(&md_sx); 1756 return (error); 1757 } 1758 1759 static int 1760 kern_mddetach_locked(struct thread *td, struct md_req *mdr) 1761 { 1762 struct md_s *sc; 1763 1764 sx_assert(&md_sx, SA_XLOCKED); 1765 1766 if (mdr->md_mediasize != 0 || 1767 (mdr->md_options & ~MD_FORCE) != 0) 1768 return (EINVAL); 1769 1770 sc = mdfind(mdr->md_unit); 1771 if (sc == NULL) 1772 return (ENOENT); 1773 if (sc->opencount != 0 && !(sc->flags & MD_FORCE) && 1774 !(mdr->md_options & MD_FORCE)) 1775 return (EBUSY); 1776 return (mddestroy(sc, td)); 1777 } 1778 1779 static int 1780 kern_mddetach(struct thread *td, struct md_req *mdr) 1781 { 1782 int error; 1783 1784 sx_xlock(&md_sx); 1785 error = kern_mddetach_locked(td, mdr); 1786 sx_xunlock(&md_sx); 1787 return (error); 1788 } 1789 1790 static int 1791 kern_mdresize_locked(struct md_req *mdr) 1792 { 1793 struct md_s *sc; 1794 1795 sx_assert(&md_sx, SA_XLOCKED); 1796 1797 if ((mdr->md_options & ~(MD_FORCE | MD_RESERVE)) != 0) 1798 return (EINVAL); 1799 1800 sc = mdfind(mdr->md_unit); 1801 if (sc == NULL) 1802 return (ENOENT); 1803 if (mdr->md_mediasize < sc->sectorsize) 1804 return (EINVAL); 1805 mdr->md_mediasize -= mdr->md_mediasize % sc->sectorsize; 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