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