1 /*- 2 * SPDX-License-Identifier: (Beerware AND BSD-3-Clause) 3 * 4 * ---------------------------------------------------------------------------- 5 * "THE BEER-WARE LICENSE" (Revision 42): 6 * <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you 7 * can do whatever you want with this stuff. If we meet some day, and you think 8 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 9 * ---------------------------------------------------------------------------- 10 * 11 * $FreeBSD$ 12 * 13 */ 14 15 /*- 16 * The following functions are based in the vn(4) driver: mdstart_swap(), 17 * mdstart_vnode(), mdcreate_swap(), mdcreate_vnode() and mddestroy(), 18 * and as such under the following copyright: 19 * 20 * Copyright (c) 1988 University of Utah. 21 * Copyright (c) 1990, 1993 22 * The Regents of the University of California. All rights reserved. 23 * Copyright (c) 2013 The FreeBSD Foundation 24 * All rights reserved. 25 * 26 * This code is derived from software contributed to Berkeley by 27 * the Systems Programming Group of the University of Utah Computer 28 * Science Department. 29 * 30 * Portions of this software were developed by Konstantin Belousov 31 * under sponsorship from the FreeBSD Foundation. 32 * 33 * Redistribution and use in source and binary forms, with or without 34 * modification, are permitted provided that the following conditions 35 * are met: 36 * 1. Redistributions of source code must retain the above copyright 37 * notice, this list of conditions and the following disclaimer. 38 * 2. Redistributions in binary form must reproduce the above copyright 39 * notice, this list of conditions and the following disclaimer in the 40 * documentation and/or other materials provided with the distribution. 41 * 3. Neither the name of the University nor the names of its contributors 42 * may be used to endorse or promote products derived from this software 43 * without specific prior written permission. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 48 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 55 * SUCH DAMAGE. 56 * 57 * from: Utah Hdr: vn.c 1.13 94/04/02 58 * 59 * from: @(#)vn.c 8.6 (Berkeley) 4/1/94 60 * From: src/sys/dev/vn/vn.c,v 1.122 2000/12/16 16:06:03 61 */ 62 63 #include "opt_rootdevname.h" 64 #include "opt_geom.h" 65 #include "opt_md.h" 66 67 #include <sys/param.h> 68 #include <sys/systm.h> 69 #include <sys/bio.h> 70 #include <sys/buf.h> 71 #include <sys/conf.h> 72 #include <sys/devicestat.h> 73 #include <sys/fcntl.h> 74 #include <sys/kernel.h> 75 #include <sys/kthread.h> 76 #include <sys/limits.h> 77 #include <sys/linker.h> 78 #include <sys/lock.h> 79 #include <sys/malloc.h> 80 #include <sys/mdioctl.h> 81 #include <sys/mount.h> 82 #include <sys/mutex.h> 83 #include <sys/sx.h> 84 #include <sys/namei.h> 85 #include <sys/proc.h> 86 #include <sys/queue.h> 87 #include <sys/rwlock.h> 88 #include <sys/sbuf.h> 89 #include <sys/sched.h> 90 #include <sys/sf_buf.h> 91 #include <sys/sysctl.h> 92 #include <sys/uio.h> 93 #include <sys/vnode.h> 94 #include <sys/disk.h> 95 96 #include <geom/geom.h> 97 #include <geom/geom_int.h> 98 99 #include <vm/vm.h> 100 #include <vm/vm_param.h> 101 #include <vm/vm_object.h> 102 #include <vm/vm_page.h> 103 #include <vm/vm_pager.h> 104 #include <vm/swap_pager.h> 105 #include <vm/uma.h> 106 107 #include <machine/bus.h> 108 109 #define MD_MODVER 1 110 111 #define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */ 112 #define MD_EXITING 0x20000 /* Worker thread is exiting. */ 113 #define MD_PROVIDERGONE 0x40000 /* Safe to free the softc */ 114 115 #ifndef MD_NSECT 116 #define MD_NSECT (10000 * 2) 117 #endif 118 119 struct md_req { 120 unsigned md_unit; /* unit number */ 121 enum md_types md_type; /* type of disk */ 122 off_t md_mediasize; /* size of disk in bytes */ 123 unsigned md_sectorsize; /* sectorsize */ 124 unsigned md_options; /* options */ 125 int md_fwheads; /* firmware heads */ 126 int md_fwsectors; /* firmware sectors */ 127 char *md_file; /* pathname of file to mount */ 128 enum uio_seg md_file_seg; /* location of md_file */ 129 char *md_label; /* label of the device (userspace) */ 130 int *md_units; /* pointer to units array (kernel) */ 131 size_t md_units_nitems; /* items in md_units array */ 132 }; 133 134 #ifdef COMPAT_FREEBSD32 135 struct md_ioctl32 { 136 unsigned md_version; 137 unsigned md_unit; 138 enum md_types md_type; 139 uint32_t md_file; 140 off_t md_mediasize; 141 unsigned md_sectorsize; 142 unsigned md_options; 143 uint64_t md_base; 144 int md_fwheads; 145 int md_fwsectors; 146 uint32_t md_label; 147 int md_pad[MDNPAD]; 148 } __attribute__((__packed__)); 149 CTASSERT((sizeof(struct md_ioctl32)) == 436); 150 151 #define MDIOCATTACH_32 _IOC_NEWTYPE(MDIOCATTACH, struct md_ioctl32) 152 #define MDIOCDETACH_32 _IOC_NEWTYPE(MDIOCDETACH, struct md_ioctl32) 153 #define MDIOCQUERY_32 _IOC_NEWTYPE(MDIOCQUERY, struct md_ioctl32) 154 #define MDIOCRESIZE_32 _IOC_NEWTYPE(MDIOCRESIZE, struct md_ioctl32) 155 #endif /* COMPAT_FREEBSD32 */ 156 157 static MALLOC_DEFINE(M_MD, "md_disk", "Memory Disk"); 158 static MALLOC_DEFINE(M_MDSECT, "md_sectors", "Memory Disk Sectors"); 159 160 static int md_debug; 161 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, 162 "Enable md(4) debug messages"); 163 static int md_malloc_wait; 164 SYSCTL_INT(_vm, OID_AUTO, md_malloc_wait, CTLFLAG_RW, &md_malloc_wait, 0, 165 "Allow malloc to wait for memory allocations"); 166 167 #if defined(MD_ROOT) && !defined(MD_ROOT_FSTYPE) 168 #define MD_ROOT_FSTYPE "ufs" 169 #endif 170 171 #if defined(MD_ROOT) 172 /* 173 * Preloaded image gets put here. 174 */ 175 #if defined(MD_ROOT_SIZE) 176 /* 177 * We put the mfs_root symbol into the oldmfs section of the kernel object file. 178 * Applications that patch the object with the image can determine 179 * the size looking at the oldmfs section size within the kernel. 180 */ 181 u_char mfs_root[MD_ROOT_SIZE*1024] __attribute__ ((section ("oldmfs"))); 182 const int mfs_root_size = sizeof(mfs_root); 183 #elif defined(MD_ROOT_MEM) 184 /* MD region already mapped in the memory */ 185 u_char *mfs_root; 186 int mfs_root_size; 187 #else 188 extern volatile u_char __weak_symbol mfs_root; 189 extern volatile u_char __weak_symbol mfs_root_end; 190 __GLOBL(mfs_root); 191 __GLOBL(mfs_root_end); 192 #define mfs_root_size ((uintptr_t)(&mfs_root_end - &mfs_root)) 193 #endif 194 #endif 195 196 static g_init_t g_md_init; 197 static g_fini_t g_md_fini; 198 static g_start_t g_md_start; 199 static g_access_t g_md_access; 200 static void g_md_dumpconf(struct sbuf *sb, const char *indent, 201 struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp); 202 static g_provgone_t g_md_providergone; 203 204 static struct cdev *status_dev = NULL; 205 static struct sx md_sx; 206 static struct unrhdr *md_uh; 207 208 static d_ioctl_t mdctlioctl; 209 210 static struct cdevsw mdctl_cdevsw = { 211 .d_version = D_VERSION, 212 .d_ioctl = mdctlioctl, 213 .d_name = MD_NAME, 214 }; 215 216 struct g_class g_md_class = { 217 .name = "MD", 218 .version = G_VERSION, 219 .init = g_md_init, 220 .fini = g_md_fini, 221 .start = g_md_start, 222 .access = g_md_access, 223 .dumpconf = g_md_dumpconf, 224 .providergone = g_md_providergone, 225 }; 226 227 DECLARE_GEOM_CLASS(g_md_class, g_md); 228 229 230 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(md_softc_list); 231 232 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 233 #define NMASK (NINDIR-1) 234 static int nshift; 235 236 static uma_zone_t md_pbuf_zone; 237 238 struct indir { 239 uintptr_t *array; 240 u_int total; 241 u_int used; 242 u_int shift; 243 }; 244 245 struct md_s { 246 int unit; 247 LIST_ENTRY(md_s) list; 248 struct bio_queue_head bio_queue; 249 struct mtx queue_mtx; 250 struct mtx stat_mtx; 251 struct cdev *dev; 252 enum md_types type; 253 off_t mediasize; 254 unsigned sectorsize; 255 unsigned opencount; 256 unsigned fwheads; 257 unsigned fwsectors; 258 char ident[32]; 259 unsigned flags; 260 char name[20]; 261 struct proc *procp; 262 struct g_geom *gp; 263 struct g_provider *pp; 264 int (*start)(struct md_s *sc, struct bio *bp); 265 struct devstat *devstat; 266 267 /* MD_MALLOC related fields */ 268 struct indir *indir; 269 uma_zone_t uma; 270 271 /* MD_PRELOAD related fields */ 272 u_char *pl_ptr; 273 size_t pl_len; 274 275 /* MD_VNODE related fields */ 276 struct vnode *vnode; 277 char file[PATH_MAX]; 278 char label[PATH_MAX]; 279 struct ucred *cred; 280 281 /* MD_SWAP related fields */ 282 vm_object_t object; 283 }; 284 285 static struct indir * 286 new_indir(u_int shift) 287 { 288 struct indir *ip; 289 290 ip = malloc(sizeof *ip, M_MD, (md_malloc_wait ? M_WAITOK : M_NOWAIT) 291 | M_ZERO); 292 if (ip == NULL) 293 return (NULL); 294 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 295 M_MDSECT, (md_malloc_wait ? M_WAITOK : M_NOWAIT) | M_ZERO); 296 if (ip->array == NULL) { 297 free(ip, M_MD); 298 return (NULL); 299 } 300 ip->total = NINDIR; 301 ip->shift = shift; 302 return (ip); 303 } 304 305 static void 306 del_indir(struct indir *ip) 307 { 308 309 free(ip->array, M_MDSECT); 310 free(ip, M_MD); 311 } 312 313 static void 314 destroy_indir(struct md_s *sc, struct indir *ip) 315 { 316 int i; 317 318 for (i = 0; i < NINDIR; i++) { 319 if (!ip->array[i]) 320 continue; 321 if (ip->shift) 322 destroy_indir(sc, (struct indir*)(ip->array[i])); 323 else if (ip->array[i] > 255) 324 uma_zfree(sc->uma, (void *)(ip->array[i])); 325 } 326 del_indir(ip); 327 } 328 329 /* 330 * This function does the math and allocates the top level "indir" structure 331 * for a device of "size" sectors. 332 */ 333 334 static struct indir * 335 dimension(off_t size) 336 { 337 off_t rcnt; 338 struct indir *ip; 339 int layer; 340 341 rcnt = size; 342 layer = 0; 343 while (rcnt > NINDIR) { 344 rcnt /= NINDIR; 345 layer++; 346 } 347 348 /* 349 * XXX: the top layer is probably not fully populated, so we allocate 350 * too much space for ip->array in here. 351 */ 352 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO); 353 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 354 M_MDSECT, M_WAITOK | M_ZERO); 355 ip->total = NINDIR; 356 ip->shift = layer * nshift; 357 return (ip); 358 } 359 360 /* 361 * Read a given sector 362 */ 363 364 static uintptr_t 365 s_read(struct indir *ip, off_t offset) 366 { 367 struct indir *cip; 368 int idx; 369 uintptr_t up; 370 371 if (md_debug > 1) 372 printf("s_read(%jd)\n", (intmax_t)offset); 373 up = 0; 374 for (cip = ip; cip != NULL;) { 375 if (cip->shift) { 376 idx = (offset >> cip->shift) & NMASK; 377 up = cip->array[idx]; 378 cip = (struct indir *)up; 379 continue; 380 } 381 idx = offset & NMASK; 382 return (cip->array[idx]); 383 } 384 return (0); 385 } 386 387 /* 388 * Write a given sector, prune the tree if the value is 0 389 */ 390 391 static int 392 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 393 { 394 struct indir *cip, *lip[10]; 395 int idx, li; 396 uintptr_t up; 397 398 if (md_debug > 1) 399 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 400 up = 0; 401 li = 0; 402 cip = ip; 403 for (;;) { 404 lip[li++] = cip; 405 if (cip->shift) { 406 idx = (offset >> cip->shift) & NMASK; 407 up = cip->array[idx]; 408 if (up != 0) { 409 cip = (struct indir *)up; 410 continue; 411 } 412 /* Allocate branch */ 413 cip->array[idx] = 414 (uintptr_t)new_indir(cip->shift - nshift); 415 if (cip->array[idx] == 0) 416 return (ENOSPC); 417 cip->used++; 418 up = cip->array[idx]; 419 cip = (struct indir *)up; 420 continue; 421 } 422 /* leafnode */ 423 idx = offset & NMASK; 424 up = cip->array[idx]; 425 if (up != 0) 426 cip->used--; 427 cip->array[idx] = ptr; 428 if (ptr != 0) 429 cip->used++; 430 break; 431 } 432 if (cip->used != 0 || li == 1) 433 return (0); 434 li--; 435 while (cip->used == 0 && cip != ip) { 436 li--; 437 idx = (offset >> lip[li]->shift) & NMASK; 438 up = lip[li]->array[idx]; 439 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 440 del_indir(cip); 441 lip[li]->array[idx] = 0; 442 lip[li]->used--; 443 cip = lip[li]; 444 } 445 return (0); 446 } 447 448 449 static int 450 g_md_access(struct g_provider *pp, int r, int w, int e) 451 { 452 struct md_s *sc; 453 454 sc = pp->geom->softc; 455 if (sc == NULL) { 456 if (r <= 0 && w <= 0 && e <= 0) 457 return (0); 458 return (ENXIO); 459 } 460 r += pp->acr; 461 w += pp->acw; 462 e += pp->ace; 463 if ((sc->flags & MD_READONLY) != 0 && w > 0) 464 return (EROFS); 465 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 466 sc->opencount = 1; 467 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 468 sc->opencount = 0; 469 } 470 return (0); 471 } 472 473 static void 474 g_md_start(struct bio *bp) 475 { 476 struct md_s *sc; 477 478 sc = bp->bio_to->geom->softc; 479 if ((bp->bio_cmd == BIO_READ) || (bp->bio_cmd == BIO_WRITE)) { 480 mtx_lock(&sc->stat_mtx); 481 devstat_start_transaction_bio(sc->devstat, bp); 482 mtx_unlock(&sc->stat_mtx); 483 } 484 mtx_lock(&sc->queue_mtx); 485 bioq_disksort(&sc->bio_queue, bp); 486 wakeup(sc); 487 mtx_unlock(&sc->queue_mtx); 488 } 489 490 #define MD_MALLOC_MOVE_ZERO 1 491 #define MD_MALLOC_MOVE_FILL 2 492 #define MD_MALLOC_MOVE_READ 3 493 #define MD_MALLOC_MOVE_WRITE 4 494 #define MD_MALLOC_MOVE_CMP 5 495 496 static int 497 md_malloc_move_ma(vm_page_t **mp, int *ma_offs, unsigned sectorsize, 498 void *ptr, u_char fill, int op) 499 { 500 struct sf_buf *sf; 501 vm_page_t m, *mp1; 502 char *p, first; 503 off_t *uc; 504 unsigned n; 505 int error, i, ma_offs1, sz, first_read; 506 507 m = NULL; 508 error = 0; 509 sf = NULL; 510 /* if (op == MD_MALLOC_MOVE_CMP) { gcc */ 511 first = 0; 512 first_read = 0; 513 uc = ptr; 514 mp1 = *mp; 515 ma_offs1 = *ma_offs; 516 /* } */ 517 sched_pin(); 518 for (n = sectorsize; n != 0; n -= sz) { 519 sz = imin(PAGE_SIZE - *ma_offs, n); 520 if (m != **mp) { 521 if (sf != NULL) 522 sf_buf_free(sf); 523 m = **mp; 524 sf = sf_buf_alloc(m, SFB_CPUPRIVATE | 525 (md_malloc_wait ? 0 : SFB_NOWAIT)); 526 if (sf == NULL) { 527 error = ENOMEM; 528 break; 529 } 530 } 531 p = (char *)sf_buf_kva(sf) + *ma_offs; 532 switch (op) { 533 case MD_MALLOC_MOVE_ZERO: 534 bzero(p, sz); 535 break; 536 case MD_MALLOC_MOVE_FILL: 537 memset(p, fill, sz); 538 break; 539 case MD_MALLOC_MOVE_READ: 540 bcopy(ptr, p, sz); 541 cpu_flush_dcache(p, sz); 542 break; 543 case MD_MALLOC_MOVE_WRITE: 544 bcopy(p, ptr, sz); 545 break; 546 case MD_MALLOC_MOVE_CMP: 547 for (i = 0; i < sz; i++, p++) { 548 if (!first_read) { 549 *uc = (u_char)*p; 550 first = *p; 551 first_read = 1; 552 } else if (*p != first) { 553 error = EDOOFUS; 554 break; 555 } 556 } 557 break; 558 default: 559 KASSERT(0, ("md_malloc_move_ma unknown op %d\n", op)); 560 break; 561 } 562 if (error != 0) 563 break; 564 *ma_offs += sz; 565 *ma_offs %= PAGE_SIZE; 566 if (*ma_offs == 0) 567 (*mp)++; 568 ptr = (char *)ptr + sz; 569 } 570 571 if (sf != NULL) 572 sf_buf_free(sf); 573 sched_unpin(); 574 if (op == MD_MALLOC_MOVE_CMP && error != 0) { 575 *mp = mp1; 576 *ma_offs = ma_offs1; 577 } 578 return (error); 579 } 580 581 static int 582 md_malloc_move_vlist(bus_dma_segment_t **pvlist, int *pma_offs, 583 unsigned len, void *ptr, u_char fill, int op) 584 { 585 bus_dma_segment_t *vlist; 586 uint8_t *p, *end, first; 587 off_t *uc; 588 int ma_offs, seg_len; 589 590 vlist = *pvlist; 591 ma_offs = *pma_offs; 592 uc = ptr; 593 594 for (; len != 0; len -= seg_len) { 595 seg_len = imin(vlist->ds_len - ma_offs, len); 596 p = (uint8_t *)(uintptr_t)vlist->ds_addr + ma_offs; 597 switch (op) { 598 case MD_MALLOC_MOVE_ZERO: 599 bzero(p, seg_len); 600 break; 601 case MD_MALLOC_MOVE_FILL: 602 memset(p, fill, seg_len); 603 break; 604 case MD_MALLOC_MOVE_READ: 605 bcopy(ptr, p, seg_len); 606 cpu_flush_dcache(p, seg_len); 607 break; 608 case MD_MALLOC_MOVE_WRITE: 609 bcopy(p, ptr, seg_len); 610 break; 611 case MD_MALLOC_MOVE_CMP: 612 end = p + seg_len; 613 first = *uc = *p; 614 /* Confirm all following bytes match the first */ 615 while (++p < end) { 616 if (*p != first) 617 return (EDOOFUS); 618 } 619 break; 620 default: 621 KASSERT(0, ("md_malloc_move_vlist unknown op %d\n", op)); 622 break; 623 } 624 625 ma_offs += seg_len; 626 if (ma_offs == vlist->ds_len) { 627 ma_offs = 0; 628 vlist++; 629 } 630 ptr = (uint8_t *)ptr + seg_len; 631 } 632 *pvlist = vlist; 633 *pma_offs = ma_offs; 634 635 return (0); 636 } 637 638 static int 639 mdstart_malloc(struct md_s *sc, struct bio *bp) 640 { 641 u_char *dst; 642 vm_page_t *m; 643 bus_dma_segment_t *vlist; 644 int i, error, error1, ma_offs, notmapped; 645 off_t secno, nsec, uc; 646 uintptr_t sp, osp; 647 648 switch (bp->bio_cmd) { 649 case BIO_READ: 650 case BIO_WRITE: 651 case BIO_DELETE: 652 break; 653 default: 654 return (EOPNOTSUPP); 655 } 656 657 notmapped = (bp->bio_flags & BIO_UNMAPPED) != 0; 658 vlist = (bp->bio_flags & BIO_VLIST) != 0 ? 659 (bus_dma_segment_t *)bp->bio_data : NULL; 660 if (notmapped) { 661 m = bp->bio_ma; 662 ma_offs = bp->bio_ma_offset; 663 dst = NULL; 664 KASSERT(vlist == NULL, ("vlists cannot be unmapped")); 665 } else if (vlist != NULL) { 666 ma_offs = bp->bio_ma_offset; 667 dst = NULL; 668 } else { 669 dst = bp->bio_data; 670 } 671 672 nsec = bp->bio_length / sc->sectorsize; 673 secno = bp->bio_offset / sc->sectorsize; 674 error = 0; 675 while (nsec--) { 676 osp = s_read(sc->indir, secno); 677 if (bp->bio_cmd == BIO_DELETE) { 678 if (osp != 0) 679 error = s_write(sc->indir, secno, 0); 680 } else if (bp->bio_cmd == BIO_READ) { 681 if (osp == 0) { 682 if (notmapped) { 683 error = md_malloc_move_ma(&m, &ma_offs, 684 sc->sectorsize, NULL, 0, 685 MD_MALLOC_MOVE_ZERO); 686 } else if (vlist != NULL) { 687 error = md_malloc_move_vlist(&vlist, 688 &ma_offs, sc->sectorsize, NULL, 0, 689 MD_MALLOC_MOVE_ZERO); 690 } else 691 bzero(dst, sc->sectorsize); 692 } else if (osp <= 255) { 693 if (notmapped) { 694 error = md_malloc_move_ma(&m, &ma_offs, 695 sc->sectorsize, NULL, osp, 696 MD_MALLOC_MOVE_FILL); 697 } else if (vlist != NULL) { 698 error = md_malloc_move_vlist(&vlist, 699 &ma_offs, sc->sectorsize, NULL, osp, 700 MD_MALLOC_MOVE_FILL); 701 } else 702 memset(dst, osp, sc->sectorsize); 703 } else { 704 if (notmapped) { 705 error = md_malloc_move_ma(&m, &ma_offs, 706 sc->sectorsize, (void *)osp, 0, 707 MD_MALLOC_MOVE_READ); 708 } else if (vlist != NULL) { 709 error = md_malloc_move_vlist(&vlist, 710 &ma_offs, sc->sectorsize, 711 (void *)osp, 0, 712 MD_MALLOC_MOVE_READ); 713 } else { 714 bcopy((void *)osp, dst, sc->sectorsize); 715 cpu_flush_dcache(dst, sc->sectorsize); 716 } 717 } 718 osp = 0; 719 } else if (bp->bio_cmd == BIO_WRITE) { 720 if (sc->flags & MD_COMPRESS) { 721 if (notmapped) { 722 error1 = md_malloc_move_ma(&m, &ma_offs, 723 sc->sectorsize, &uc, 0, 724 MD_MALLOC_MOVE_CMP); 725 i = error1 == 0 ? sc->sectorsize : 0; 726 } else if (vlist != NULL) { 727 error1 = md_malloc_move_vlist(&vlist, 728 &ma_offs, sc->sectorsize, &uc, 0, 729 MD_MALLOC_MOVE_CMP); 730 i = error1 == 0 ? sc->sectorsize : 0; 731 } else { 732 uc = dst[0]; 733 for (i = 1; i < sc->sectorsize; i++) { 734 if (dst[i] != uc) 735 break; 736 } 737 } 738 } else { 739 i = 0; 740 uc = 0; 741 } 742 if (i == sc->sectorsize) { 743 if (osp != uc) 744 error = s_write(sc->indir, secno, uc); 745 } else { 746 if (osp <= 255) { 747 sp = (uintptr_t)uma_zalloc(sc->uma, 748 md_malloc_wait ? M_WAITOK : 749 M_NOWAIT); 750 if (sp == 0) { 751 error = ENOSPC; 752 break; 753 } 754 if (notmapped) { 755 error = md_malloc_move_ma(&m, 756 &ma_offs, sc->sectorsize, 757 (void *)sp, 0, 758 MD_MALLOC_MOVE_WRITE); 759 } else if (vlist != NULL) { 760 error = md_malloc_move_vlist( 761 &vlist, &ma_offs, 762 sc->sectorsize, (void *)sp, 763 0, MD_MALLOC_MOVE_WRITE); 764 } else { 765 bcopy(dst, (void *)sp, 766 sc->sectorsize); 767 } 768 error = s_write(sc->indir, secno, sp); 769 } else { 770 if (notmapped) { 771 error = md_malloc_move_ma(&m, 772 &ma_offs, sc->sectorsize, 773 (void *)osp, 0, 774 MD_MALLOC_MOVE_WRITE); 775 } else if (vlist != NULL) { 776 error = md_malloc_move_vlist( 777 &vlist, &ma_offs, 778 sc->sectorsize, (void *)osp, 779 0, MD_MALLOC_MOVE_WRITE); 780 } else { 781 bcopy(dst, (void *)osp, 782 sc->sectorsize); 783 } 784 osp = 0; 785 } 786 } 787 } else { 788 error = EOPNOTSUPP; 789 } 790 if (osp > 255) 791 uma_zfree(sc->uma, (void*)osp); 792 if (error != 0) 793 break; 794 secno++; 795 if (!notmapped && vlist == NULL) 796 dst += sc->sectorsize; 797 } 798 bp->bio_resid = 0; 799 return (error); 800 } 801 802 static void 803 mdcopyto_vlist(void *src, bus_dma_segment_t *vlist, off_t offset, off_t len) 804 { 805 off_t seg_len; 806 807 while (offset >= vlist->ds_len) { 808 offset -= vlist->ds_len; 809 vlist++; 810 } 811 812 while (len != 0) { 813 seg_len = omin(len, vlist->ds_len - offset); 814 bcopy(src, (void *)(uintptr_t)(vlist->ds_addr + offset), 815 seg_len); 816 offset = 0; 817 src = (uint8_t *)src + seg_len; 818 len -= seg_len; 819 vlist++; 820 } 821 } 822 823 static void 824 mdcopyfrom_vlist(bus_dma_segment_t *vlist, off_t offset, void *dst, off_t len) 825 { 826 off_t seg_len; 827 828 while (offset >= vlist->ds_len) { 829 offset -= vlist->ds_len; 830 vlist++; 831 } 832 833 while (len != 0) { 834 seg_len = omin(len, vlist->ds_len - offset); 835 bcopy((void *)(uintptr_t)(vlist->ds_addr + offset), dst, 836 seg_len); 837 offset = 0; 838 dst = (uint8_t *)dst + seg_len; 839 len -= seg_len; 840 vlist++; 841 } 842 } 843 844 static int 845 mdstart_preload(struct md_s *sc, struct bio *bp) 846 { 847 uint8_t *p; 848 849 p = sc->pl_ptr + bp->bio_offset; 850 switch (bp->bio_cmd) { 851 case BIO_READ: 852 if ((bp->bio_flags & BIO_VLIST) != 0) { 853 mdcopyto_vlist(p, (bus_dma_segment_t *)bp->bio_data, 854 bp->bio_ma_offset, bp->bio_length); 855 } else { 856 bcopy(p, bp->bio_data, bp->bio_length); 857 } 858 cpu_flush_dcache(bp->bio_data, bp->bio_length); 859 break; 860 case BIO_WRITE: 861 if ((bp->bio_flags & BIO_VLIST) != 0) { 862 mdcopyfrom_vlist((bus_dma_segment_t *)bp->bio_data, 863 bp->bio_ma_offset, p, bp->bio_length); 864 } else { 865 bcopy(bp->bio_data, p, bp->bio_length); 866 } 867 break; 868 } 869 bp->bio_resid = 0; 870 return (0); 871 } 872 873 static int 874 mdstart_vnode(struct md_s *sc, struct bio *bp) 875 { 876 int error; 877 struct uio auio; 878 struct iovec aiov; 879 struct iovec *piov; 880 struct mount *mp; 881 struct vnode *vp; 882 struct buf *pb; 883 bus_dma_segment_t *vlist; 884 struct thread *td; 885 off_t iolen, iostart, len, zerosize; 886 int ma_offs, npages; 887 888 switch (bp->bio_cmd) { 889 case BIO_READ: 890 auio.uio_rw = UIO_READ; 891 break; 892 case BIO_WRITE: 893 case BIO_DELETE: 894 auio.uio_rw = UIO_WRITE; 895 break; 896 case BIO_FLUSH: 897 break; 898 default: 899 return (EOPNOTSUPP); 900 } 901 902 td = curthread; 903 vp = sc->vnode; 904 pb = NULL; 905 piov = NULL; 906 ma_offs = bp->bio_ma_offset; 907 len = bp->bio_length; 908 909 /* 910 * VNODE I/O 911 * 912 * If an error occurs, we set BIO_ERROR but we do not set 913 * B_INVAL because (for a write anyway), the buffer is 914 * still valid. 915 */ 916 917 if (bp->bio_cmd == BIO_FLUSH) { 918 (void) vn_start_write(vp, &mp, V_WAIT); 919 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 920 error = VOP_FSYNC(vp, MNT_WAIT, td); 921 VOP_UNLOCK(vp, 0); 922 vn_finished_write(mp); 923 return (error); 924 } 925 926 auio.uio_offset = (vm_ooffset_t)bp->bio_offset; 927 auio.uio_resid = bp->bio_length; 928 auio.uio_segflg = UIO_SYSSPACE; 929 auio.uio_td = td; 930 931 if (bp->bio_cmd == BIO_DELETE) { 932 /* 933 * Emulate BIO_DELETE by writing zeros. 934 */ 935 zerosize = ZERO_REGION_SIZE - 936 (ZERO_REGION_SIZE % sc->sectorsize); 937 auio.uio_iovcnt = howmany(bp->bio_length, zerosize); 938 piov = malloc(sizeof(*piov) * auio.uio_iovcnt, M_MD, M_WAITOK); 939 auio.uio_iov = piov; 940 while (len > 0) { 941 piov->iov_base = __DECONST(void *, zero_region); 942 piov->iov_len = len; 943 if (len > zerosize) 944 piov->iov_len = zerosize; 945 len -= piov->iov_len; 946 piov++; 947 } 948 piov = auio.uio_iov; 949 } else if ((bp->bio_flags & BIO_VLIST) != 0) { 950 piov = malloc(sizeof(*piov) * bp->bio_ma_n, M_MD, M_WAITOK); 951 auio.uio_iov = piov; 952 vlist = (bus_dma_segment_t *)bp->bio_data; 953 while (len > 0) { 954 piov->iov_base = (void *)(uintptr_t)(vlist->ds_addr + 955 ma_offs); 956 piov->iov_len = vlist->ds_len - ma_offs; 957 if (piov->iov_len > len) 958 piov->iov_len = len; 959 len -= piov->iov_len; 960 ma_offs = 0; 961 vlist++; 962 piov++; 963 } 964 auio.uio_iovcnt = piov - auio.uio_iov; 965 piov = auio.uio_iov; 966 } else if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 967 pb = uma_zalloc(md_pbuf_zone, M_WAITOK); 968 bp->bio_resid = len; 969 unmapped_step: 970 npages = atop(min(MAXPHYS, round_page(len + (ma_offs & 971 PAGE_MASK)))); 972 iolen = min(ptoa(npages) - (ma_offs & PAGE_MASK), len); 973 KASSERT(iolen > 0, ("zero iolen")); 974 pmap_qenter((vm_offset_t)pb->b_data, 975 &bp->bio_ma[atop(ma_offs)], npages); 976 aiov.iov_base = (void *)((vm_offset_t)pb->b_data + 977 (ma_offs & PAGE_MASK)); 978 aiov.iov_len = iolen; 979 auio.uio_iov = &aiov; 980 auio.uio_iovcnt = 1; 981 auio.uio_resid = iolen; 982 } else { 983 aiov.iov_base = bp->bio_data; 984 aiov.iov_len = bp->bio_length; 985 auio.uio_iov = &aiov; 986 auio.uio_iovcnt = 1; 987 } 988 iostart = auio.uio_offset; 989 if (auio.uio_rw == UIO_READ) { 990 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 991 error = VOP_READ(vp, &auio, 0, sc->cred); 992 VOP_UNLOCK(vp, 0); 993 } else { 994 (void) vn_start_write(vp, &mp, V_WAIT); 995 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 996 error = VOP_WRITE(vp, &auio, sc->flags & MD_ASYNC ? 0 : IO_SYNC, 997 sc->cred); 998 VOP_UNLOCK(vp, 0); 999 vn_finished_write(mp); 1000 if (error == 0) 1001 sc->flags &= ~MD_VERIFY; 1002 } 1003 1004 /* When MD_CACHE is set, try to avoid double-caching the data. */ 1005 if (error == 0 && (sc->flags & MD_CACHE) == 0) 1006 VOP_ADVISE(vp, iostart, auio.uio_offset - 1, 1007 POSIX_FADV_DONTNEED); 1008 1009 if (pb != NULL) { 1010 pmap_qremove((vm_offset_t)pb->b_data, npages); 1011 if (error == 0) { 1012 len -= iolen; 1013 bp->bio_resid -= iolen; 1014 ma_offs += iolen; 1015 if (len > 0) 1016 goto unmapped_step; 1017 } 1018 uma_zfree(md_pbuf_zone, pb); 1019 } 1020 1021 free(piov, M_MD); 1022 if (pb == NULL) 1023 bp->bio_resid = auio.uio_resid; 1024 return (error); 1025 } 1026 1027 static void 1028 md_swap_page_free(vm_page_t m) 1029 { 1030 1031 vm_page_xunbusy(m); 1032 vm_page_lock(m); 1033 vm_page_free(m); 1034 vm_page_unlock(m); 1035 } 1036 1037 static int 1038 mdstart_swap(struct md_s *sc, struct bio *bp) 1039 { 1040 vm_page_t m; 1041 u_char *p; 1042 vm_pindex_t i, lastp; 1043 bus_dma_segment_t *vlist; 1044 int rv, ma_offs, offs, len, lastend; 1045 1046 switch (bp->bio_cmd) { 1047 case BIO_READ: 1048 case BIO_WRITE: 1049 case BIO_DELETE: 1050 break; 1051 default: 1052 return (EOPNOTSUPP); 1053 } 1054 1055 p = bp->bio_data; 1056 ma_offs = (bp->bio_flags & (BIO_UNMAPPED|BIO_VLIST)) != 0 ? 1057 bp->bio_ma_offset : 0; 1058 vlist = (bp->bio_flags & BIO_VLIST) != 0 ? 1059 (bus_dma_segment_t *)bp->bio_data : NULL; 1060 1061 /* 1062 * offs is the offset at which to start operating on the 1063 * next (ie, first) page. lastp is the last page on 1064 * which we're going to operate. lastend is the ending 1065 * position within that last page (ie, PAGE_SIZE if 1066 * we're operating on complete aligned pages). 1067 */ 1068 offs = bp->bio_offset % PAGE_SIZE; 1069 lastp = (bp->bio_offset + bp->bio_length - 1) / PAGE_SIZE; 1070 lastend = (bp->bio_offset + bp->bio_length - 1) % PAGE_SIZE + 1; 1071 1072 rv = VM_PAGER_OK; 1073 VM_OBJECT_WLOCK(sc->object); 1074 vm_object_pip_add(sc->object, 1); 1075 for (i = bp->bio_offset / PAGE_SIZE; i <= lastp; i++) { 1076 len = ((i == lastp) ? lastend : PAGE_SIZE) - offs; 1077 m = vm_page_grab(sc->object, i, VM_ALLOC_SYSTEM); 1078 if (bp->bio_cmd == BIO_READ) { 1079 if (m->valid == VM_PAGE_BITS_ALL) 1080 rv = VM_PAGER_OK; 1081 else 1082 rv = vm_pager_get_pages(sc->object, &m, 1, 1083 NULL, NULL); 1084 if (rv == VM_PAGER_ERROR) { 1085 md_swap_page_free(m); 1086 break; 1087 } else if (rv == VM_PAGER_FAIL) { 1088 /* 1089 * Pager does not have the page. Zero 1090 * the allocated page, and mark it as 1091 * valid. Do not set dirty, the page 1092 * can be recreated if thrown out. 1093 */ 1094 pmap_zero_page(m); 1095 m->valid = VM_PAGE_BITS_ALL; 1096 } 1097 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 1098 pmap_copy_pages(&m, offs, bp->bio_ma, 1099 ma_offs, len); 1100 } else if ((bp->bio_flags & BIO_VLIST) != 0) { 1101 physcopyout_vlist(VM_PAGE_TO_PHYS(m) + offs, 1102 vlist, ma_offs, len); 1103 cpu_flush_dcache(p, len); 1104 } else { 1105 physcopyout(VM_PAGE_TO_PHYS(m) + offs, p, len); 1106 cpu_flush_dcache(p, len); 1107 } 1108 } else if (bp->bio_cmd == BIO_WRITE) { 1109 if (len == PAGE_SIZE || m->valid == VM_PAGE_BITS_ALL) 1110 rv = VM_PAGER_OK; 1111 else 1112 rv = vm_pager_get_pages(sc->object, &m, 1, 1113 NULL, NULL); 1114 if (rv == VM_PAGER_ERROR) { 1115 md_swap_page_free(m); 1116 break; 1117 } else if (rv == VM_PAGER_FAIL) 1118 pmap_zero_page(m); 1119 1120 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 1121 pmap_copy_pages(bp->bio_ma, ma_offs, &m, 1122 offs, len); 1123 } else if ((bp->bio_flags & BIO_VLIST) != 0) { 1124 physcopyin_vlist(vlist, ma_offs, 1125 VM_PAGE_TO_PHYS(m) + offs, len); 1126 } else { 1127 physcopyin(p, VM_PAGE_TO_PHYS(m) + offs, len); 1128 } 1129 1130 m->valid = VM_PAGE_BITS_ALL; 1131 if (m->dirty != VM_PAGE_BITS_ALL) { 1132 vm_page_dirty(m); 1133 vm_pager_page_unswapped(m); 1134 } 1135 } else if (bp->bio_cmd == BIO_DELETE) { 1136 if (len == PAGE_SIZE || m->valid == VM_PAGE_BITS_ALL) 1137 rv = VM_PAGER_OK; 1138 else 1139 rv = vm_pager_get_pages(sc->object, &m, 1, 1140 NULL, NULL); 1141 if (rv == VM_PAGER_ERROR) { 1142 md_swap_page_free(m); 1143 break; 1144 } else if (rv == VM_PAGER_FAIL) { 1145 md_swap_page_free(m); 1146 m = NULL; 1147 } else { 1148 /* Page is valid. */ 1149 if (len != PAGE_SIZE) { 1150 pmap_zero_page_area(m, offs, len); 1151 if (m->dirty != VM_PAGE_BITS_ALL) { 1152 vm_page_dirty(m); 1153 vm_pager_page_unswapped(m); 1154 } 1155 } else { 1156 vm_pager_page_unswapped(m); 1157 md_swap_page_free(m); 1158 m = NULL; 1159 } 1160 } 1161 } 1162 if (m != NULL) { 1163 vm_page_xunbusy(m); 1164 vm_page_lock(m); 1165 if (vm_page_active(m)) 1166 vm_page_reference(m); 1167 else 1168 vm_page_activate(m); 1169 vm_page_unlock(m); 1170 } 1171 1172 /* Actions on further pages start at offset 0 */ 1173 p += PAGE_SIZE - offs; 1174 offs = 0; 1175 ma_offs += len; 1176 } 1177 vm_object_pip_wakeup(sc->object); 1178 VM_OBJECT_WUNLOCK(sc->object); 1179 return (rv != VM_PAGER_ERROR ? 0 : ENOSPC); 1180 } 1181 1182 static int 1183 mdstart_null(struct md_s *sc, struct bio *bp) 1184 { 1185 1186 switch (bp->bio_cmd) { 1187 case BIO_READ: 1188 bzero(bp->bio_data, bp->bio_length); 1189 cpu_flush_dcache(bp->bio_data, bp->bio_length); 1190 break; 1191 case BIO_WRITE: 1192 break; 1193 } 1194 bp->bio_resid = 0; 1195 return (0); 1196 } 1197 1198 static void 1199 md_kthread(void *arg) 1200 { 1201 struct md_s *sc; 1202 struct bio *bp; 1203 int error; 1204 1205 sc = arg; 1206 thread_lock(curthread); 1207 sched_prio(curthread, PRIBIO); 1208 thread_unlock(curthread); 1209 if (sc->type == MD_VNODE) 1210 curthread->td_pflags |= TDP_NORUNNINGBUF; 1211 1212 for (;;) { 1213 mtx_lock(&sc->queue_mtx); 1214 if (sc->flags & MD_SHUTDOWN) { 1215 sc->flags |= MD_EXITING; 1216 mtx_unlock(&sc->queue_mtx); 1217 kproc_exit(0); 1218 } 1219 bp = bioq_takefirst(&sc->bio_queue); 1220 if (!bp) { 1221 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 1222 continue; 1223 } 1224 mtx_unlock(&sc->queue_mtx); 1225 if (bp->bio_cmd == BIO_GETATTR) { 1226 int isv = ((sc->flags & MD_VERIFY) != 0); 1227 1228 if ((sc->fwsectors && sc->fwheads && 1229 (g_handleattr_int(bp, "GEOM::fwsectors", 1230 sc->fwsectors) || 1231 g_handleattr_int(bp, "GEOM::fwheads", 1232 sc->fwheads))) || 1233 g_handleattr_int(bp, "GEOM::candelete", 1)) 1234 error = -1; 1235 else if (sc->ident[0] != '\0' && 1236 g_handleattr_str(bp, "GEOM::ident", sc->ident)) 1237 error = -1; 1238 else if (g_handleattr_int(bp, "MNT::verified", isv)) 1239 error = -1; 1240 else 1241 error = EOPNOTSUPP; 1242 } else { 1243 error = sc->start(sc, bp); 1244 } 1245 1246 if (bp->bio_cmd == BIO_READ || bp->bio_cmd == BIO_WRITE) { 1247 /* 1248 * Devstat uses (bio_bcount, bio_resid) for 1249 * determining the length of the completed part of 1250 * the i/o. g_io_deliver() will translate from 1251 * bio_completed to that, but it also destroys the 1252 * bio so we must do our own translation. 1253 */ 1254 bp->bio_bcount = bp->bio_length; 1255 bp->bio_resid = (error == -1 ? bp->bio_bcount : 0); 1256 devstat_end_transaction_bio(sc->devstat, bp); 1257 } 1258 if (error != -1) { 1259 bp->bio_completed = bp->bio_length; 1260 g_io_deliver(bp, error); 1261 } 1262 } 1263 } 1264 1265 static struct md_s * 1266 mdfind(int unit) 1267 { 1268 struct md_s *sc; 1269 1270 LIST_FOREACH(sc, &md_softc_list, list) { 1271 if (sc->unit == unit) 1272 break; 1273 } 1274 return (sc); 1275 } 1276 1277 static struct md_s * 1278 mdnew(int unit, int *errp, enum md_types type) 1279 { 1280 struct md_s *sc; 1281 int error; 1282 1283 *errp = 0; 1284 if (unit == -1) 1285 unit = alloc_unr(md_uh); 1286 else 1287 unit = alloc_unr_specific(md_uh, unit); 1288 1289 if (unit == -1) { 1290 *errp = EBUSY; 1291 return (NULL); 1292 } 1293 1294 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 1295 sc->type = type; 1296 bioq_init(&sc->bio_queue); 1297 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 1298 mtx_init(&sc->stat_mtx, "md stat", NULL, MTX_DEF); 1299 sc->unit = unit; 1300 sprintf(sc->name, "md%d", unit); 1301 LIST_INSERT_HEAD(&md_softc_list, sc, list); 1302 error = kproc_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 1303 if (error == 0) 1304 return (sc); 1305 LIST_REMOVE(sc, list); 1306 mtx_destroy(&sc->stat_mtx); 1307 mtx_destroy(&sc->queue_mtx); 1308 free_unr(md_uh, sc->unit); 1309 free(sc, M_MD); 1310 *errp = error; 1311 return (NULL); 1312 } 1313 1314 static void 1315 mdinit(struct md_s *sc) 1316 { 1317 struct g_geom *gp; 1318 struct g_provider *pp; 1319 1320 g_topology_lock(); 1321 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 1322 gp->softc = sc; 1323 pp = g_new_providerf(gp, "md%d", sc->unit); 1324 pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE; 1325 pp->mediasize = sc->mediasize; 1326 pp->sectorsize = sc->sectorsize; 1327 switch (sc->type) { 1328 case MD_MALLOC: 1329 case MD_VNODE: 1330 case MD_SWAP: 1331 pp->flags |= G_PF_ACCEPT_UNMAPPED; 1332 break; 1333 case MD_PRELOAD: 1334 case MD_NULL: 1335 break; 1336 } 1337 sc->gp = gp; 1338 sc->pp = pp; 1339 g_error_provider(pp, 0); 1340 g_topology_unlock(); 1341 sc->devstat = devstat_new_entry("md", sc->unit, sc->sectorsize, 1342 DEVSTAT_ALL_SUPPORTED, DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 1343 } 1344 1345 static int 1346 mdcreate_malloc(struct md_s *sc, struct md_req *mdr) 1347 { 1348 uintptr_t sp; 1349 int error; 1350 off_t u; 1351 1352 error = 0; 1353 if (mdr->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 1354 return (EINVAL); 1355 if (mdr->md_sectorsize != 0 && !powerof2(mdr->md_sectorsize)) 1356 return (EINVAL); 1357 /* Compression doesn't make sense if we have reserved space */ 1358 if (mdr->md_options & MD_RESERVE) 1359 mdr->md_options &= ~MD_COMPRESS; 1360 if (mdr->md_fwsectors != 0) 1361 sc->fwsectors = mdr->md_fwsectors; 1362 if (mdr->md_fwheads != 0) 1363 sc->fwheads = mdr->md_fwheads; 1364 sc->flags = mdr->md_options & (MD_COMPRESS | MD_FORCE); 1365 sc->indir = dimension(sc->mediasize / sc->sectorsize); 1366 sc->uma = uma_zcreate(sc->name, sc->sectorsize, NULL, NULL, NULL, NULL, 1367 0x1ff, 0); 1368 if (mdr->md_options & MD_RESERVE) { 1369 off_t nsectors; 1370 1371 nsectors = sc->mediasize / sc->sectorsize; 1372 for (u = 0; u < nsectors; u++) { 1373 sp = (uintptr_t)uma_zalloc(sc->uma, (md_malloc_wait ? 1374 M_WAITOK : M_NOWAIT) | M_ZERO); 1375 if (sp != 0) 1376 error = s_write(sc->indir, u, sp); 1377 else 1378 error = ENOMEM; 1379 if (error != 0) 1380 break; 1381 } 1382 } 1383 return (error); 1384 } 1385 1386 1387 static int 1388 mdsetcred(struct md_s *sc, struct ucred *cred) 1389 { 1390 char *tmpbuf; 1391 int error = 0; 1392 1393 /* 1394 * Set credits in our softc 1395 */ 1396 1397 if (sc->cred) 1398 crfree(sc->cred); 1399 sc->cred = crhold(cred); 1400 1401 /* 1402 * Horrible kludge to establish credentials for NFS XXX. 1403 */ 1404 1405 if (sc->vnode) { 1406 struct uio auio; 1407 struct iovec aiov; 1408 1409 tmpbuf = malloc(sc->sectorsize, M_TEMP, M_WAITOK); 1410 bzero(&auio, sizeof(auio)); 1411 1412 aiov.iov_base = tmpbuf; 1413 aiov.iov_len = sc->sectorsize; 1414 auio.uio_iov = &aiov; 1415 auio.uio_iovcnt = 1; 1416 auio.uio_offset = 0; 1417 auio.uio_rw = UIO_READ; 1418 auio.uio_segflg = UIO_SYSSPACE; 1419 auio.uio_resid = aiov.iov_len; 1420 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY); 1421 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 1422 VOP_UNLOCK(sc->vnode, 0); 1423 free(tmpbuf, M_TEMP); 1424 } 1425 return (error); 1426 } 1427 1428 static int 1429 mdcreate_vnode(struct md_s *sc, struct md_req *mdr, struct thread *td) 1430 { 1431 struct vattr vattr; 1432 struct nameidata nd; 1433 char *fname; 1434 int error, flags; 1435 1436 fname = mdr->md_file; 1437 if (mdr->md_file_seg == UIO_USERSPACE) { 1438 error = copyinstr(fname, sc->file, sizeof(sc->file), NULL); 1439 if (error != 0) 1440 return (error); 1441 } else if (mdr->md_file_seg == UIO_SYSSPACE) 1442 strlcpy(sc->file, fname, sizeof(sc->file)); 1443 else 1444 return (EDOOFUS); 1445 1446 /* 1447 * If the user specified that this is a read only device, don't 1448 * set the FWRITE mask before trying to open the backing store. 1449 */ 1450 flags = FREAD | ((mdr->md_options & MD_READONLY) ? 0 : FWRITE) \ 1451 | ((mdr->md_options & MD_VERIFY) ? O_VERIFY : 0); 1452 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, sc->file, td); 1453 error = vn_open(&nd, &flags, 0, NULL); 1454 if (error != 0) 1455 return (error); 1456 NDFREE(&nd, NDF_ONLY_PNBUF); 1457 if (nd.ni_vp->v_type != VREG) { 1458 error = EINVAL; 1459 goto bad; 1460 } 1461 error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred); 1462 if (error != 0) 1463 goto bad; 1464 if (VOP_ISLOCKED(nd.ni_vp) != LK_EXCLUSIVE) { 1465 vn_lock(nd.ni_vp, LK_UPGRADE | LK_RETRY); 1466 if (nd.ni_vp->v_iflag & VI_DOOMED) { 1467 /* Forced unmount. */ 1468 error = EBADF; 1469 goto bad; 1470 } 1471 } 1472 nd.ni_vp->v_vflag |= VV_MD; 1473 VOP_UNLOCK(nd.ni_vp, 0); 1474 1475 if (mdr->md_fwsectors != 0) 1476 sc->fwsectors = mdr->md_fwsectors; 1477 if (mdr->md_fwheads != 0) 1478 sc->fwheads = mdr->md_fwheads; 1479 snprintf(sc->ident, sizeof(sc->ident), "MD-DEV%ju-INO%ju", 1480 (uintmax_t)vattr.va_fsid, (uintmax_t)vattr.va_fileid); 1481 sc->flags = mdr->md_options & (MD_ASYNC | MD_CACHE | MD_FORCE | 1482 MD_VERIFY); 1483 if (!(flags & FWRITE)) 1484 sc->flags |= MD_READONLY; 1485 sc->vnode = nd.ni_vp; 1486 1487 error = mdsetcred(sc, td->td_ucred); 1488 if (error != 0) { 1489 sc->vnode = NULL; 1490 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY); 1491 nd.ni_vp->v_vflag &= ~VV_MD; 1492 goto bad; 1493 } 1494 return (0); 1495 bad: 1496 VOP_UNLOCK(nd.ni_vp, 0); 1497 (void)vn_close(nd.ni_vp, flags, td->td_ucred, td); 1498 return (error); 1499 } 1500 1501 static void 1502 g_md_providergone(struct g_provider *pp) 1503 { 1504 struct md_s *sc = pp->geom->softc; 1505 1506 mtx_lock(&sc->queue_mtx); 1507 sc->flags |= MD_PROVIDERGONE; 1508 wakeup(&sc->flags); 1509 mtx_unlock(&sc->queue_mtx); 1510 } 1511 1512 static int 1513 mddestroy(struct md_s *sc, struct thread *td) 1514 { 1515 1516 if (sc->gp) { 1517 g_topology_lock(); 1518 g_wither_geom(sc->gp, ENXIO); 1519 g_topology_unlock(); 1520 1521 mtx_lock(&sc->queue_mtx); 1522 while (!(sc->flags & MD_PROVIDERGONE)) 1523 msleep(&sc->flags, &sc->queue_mtx, PRIBIO, "mddestroy", 0); 1524 mtx_unlock(&sc->queue_mtx); 1525 } 1526 if (sc->devstat) { 1527 devstat_remove_entry(sc->devstat); 1528 sc->devstat = NULL; 1529 } 1530 mtx_lock(&sc->queue_mtx); 1531 sc->flags |= MD_SHUTDOWN; 1532 wakeup(sc); 1533 while (!(sc->flags & MD_EXITING)) 1534 msleep(sc->procp, &sc->queue_mtx, PRIBIO, "mddestroy", hz / 10); 1535 mtx_unlock(&sc->queue_mtx); 1536 mtx_destroy(&sc->stat_mtx); 1537 mtx_destroy(&sc->queue_mtx); 1538 if (sc->vnode != NULL) { 1539 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY); 1540 sc->vnode->v_vflag &= ~VV_MD; 1541 VOP_UNLOCK(sc->vnode, 0); 1542 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 1543 FREAD : (FREAD|FWRITE), sc->cred, td); 1544 } 1545 if (sc->cred != NULL) 1546 crfree(sc->cred); 1547 if (sc->object != NULL) 1548 vm_object_deallocate(sc->object); 1549 if (sc->indir) 1550 destroy_indir(sc, sc->indir); 1551 if (sc->uma) 1552 uma_zdestroy(sc->uma); 1553 1554 LIST_REMOVE(sc, list); 1555 free_unr(md_uh, sc->unit); 1556 free(sc, M_MD); 1557 return (0); 1558 } 1559 1560 static int 1561 mdresize(struct md_s *sc, struct md_req *mdr) 1562 { 1563 int error, res; 1564 vm_pindex_t oldpages, newpages; 1565 1566 switch (sc->type) { 1567 case MD_VNODE: 1568 case MD_NULL: 1569 break; 1570 case MD_SWAP: 1571 if (mdr->md_mediasize <= 0 || 1572 (mdr->md_mediasize % PAGE_SIZE) != 0) 1573 return (EDOM); 1574 oldpages = OFF_TO_IDX(round_page(sc->mediasize)); 1575 newpages = OFF_TO_IDX(round_page(mdr->md_mediasize)); 1576 if (newpages < oldpages) { 1577 VM_OBJECT_WLOCK(sc->object); 1578 vm_object_page_remove(sc->object, newpages, 0, 0); 1579 swap_pager_freespace(sc->object, newpages, 1580 oldpages - newpages); 1581 swap_release_by_cred(IDX_TO_OFF(oldpages - 1582 newpages), sc->cred); 1583 sc->object->charge = IDX_TO_OFF(newpages); 1584 sc->object->size = newpages; 1585 VM_OBJECT_WUNLOCK(sc->object); 1586 } else if (newpages > oldpages) { 1587 res = swap_reserve_by_cred(IDX_TO_OFF(newpages - 1588 oldpages), sc->cred); 1589 if (!res) 1590 return (ENOMEM); 1591 if ((mdr->md_options & MD_RESERVE) || 1592 (sc->flags & MD_RESERVE)) { 1593 error = swap_pager_reserve(sc->object, 1594 oldpages, newpages - oldpages); 1595 if (error < 0) { 1596 swap_release_by_cred( 1597 IDX_TO_OFF(newpages - oldpages), 1598 sc->cred); 1599 return (EDOM); 1600 } 1601 } 1602 VM_OBJECT_WLOCK(sc->object); 1603 sc->object->charge = IDX_TO_OFF(newpages); 1604 sc->object->size = newpages; 1605 VM_OBJECT_WUNLOCK(sc->object); 1606 } 1607 break; 1608 default: 1609 return (EOPNOTSUPP); 1610 } 1611 1612 sc->mediasize = mdr->md_mediasize; 1613 g_topology_lock(); 1614 g_resize_provider(sc->pp, sc->mediasize); 1615 g_topology_unlock(); 1616 return (0); 1617 } 1618 1619 static int 1620 mdcreate_swap(struct md_s *sc, struct md_req *mdr, struct thread *td) 1621 { 1622 vm_ooffset_t npage; 1623 int error; 1624 1625 /* 1626 * Range check. Disallow negative sizes and sizes not being 1627 * multiple of page size. 1628 */ 1629 if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0) 1630 return (EDOM); 1631 1632 /* 1633 * Allocate an OBJT_SWAP object. 1634 * 1635 * Note the truncation. 1636 */ 1637 1638 if ((mdr->md_options & MD_VERIFY) != 0) 1639 return (EINVAL); 1640 npage = mdr->md_mediasize / PAGE_SIZE; 1641 if (mdr->md_fwsectors != 0) 1642 sc->fwsectors = mdr->md_fwsectors; 1643 if (mdr->md_fwheads != 0) 1644 sc->fwheads = mdr->md_fwheads; 1645 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * npage, 1646 VM_PROT_DEFAULT, 0, td->td_ucred); 1647 if (sc->object == NULL) 1648 return (ENOMEM); 1649 sc->flags = mdr->md_options & (MD_FORCE | MD_RESERVE); 1650 if (mdr->md_options & MD_RESERVE) { 1651 if (swap_pager_reserve(sc->object, 0, npage) < 0) { 1652 error = EDOM; 1653 goto finish; 1654 } 1655 } 1656 error = mdsetcred(sc, td->td_ucred); 1657 finish: 1658 if (error != 0) { 1659 vm_object_deallocate(sc->object); 1660 sc->object = NULL; 1661 } 1662 return (error); 1663 } 1664 1665 static int 1666 mdcreate_null(struct md_s *sc, struct md_req *mdr, struct thread *td) 1667 { 1668 1669 /* 1670 * Range check. Disallow negative sizes and sizes not being 1671 * multiple of page size. 1672 */ 1673 if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0) 1674 return (EDOM); 1675 1676 return (0); 1677 } 1678 1679 static int 1680 kern_mdattach_locked(struct thread *td, struct md_req *mdr) 1681 { 1682 struct md_s *sc; 1683 unsigned sectsize; 1684 int error, i; 1685 1686 sx_assert(&md_sx, SA_XLOCKED); 1687 1688 switch (mdr->md_type) { 1689 case MD_MALLOC: 1690 case MD_PRELOAD: 1691 case MD_VNODE: 1692 case MD_SWAP: 1693 case MD_NULL: 1694 break; 1695 default: 1696 return (EINVAL); 1697 } 1698 if (mdr->md_sectorsize == 0) 1699 sectsize = DEV_BSIZE; 1700 else 1701 sectsize = mdr->md_sectorsize; 1702 if (sectsize > MAXPHYS || mdr->md_mediasize < sectsize) 1703 return (EINVAL); 1704 if (mdr->md_options & MD_AUTOUNIT) 1705 sc = mdnew(-1, &error, mdr->md_type); 1706 else { 1707 if (mdr->md_unit > INT_MAX) 1708 return (EINVAL); 1709 sc = mdnew(mdr->md_unit, &error, mdr->md_type); 1710 } 1711 if (sc == NULL) 1712 return (error); 1713 if (mdr->md_label != NULL) 1714 error = copyinstr(mdr->md_label, sc->label, 1715 sizeof(sc->label), NULL); 1716 if (error != 0) 1717 goto err_after_new; 1718 if (mdr->md_options & MD_AUTOUNIT) 1719 mdr->md_unit = sc->unit; 1720 sc->mediasize = mdr->md_mediasize; 1721 sc->sectorsize = sectsize; 1722 error = EDOOFUS; 1723 switch (sc->type) { 1724 case MD_MALLOC: 1725 sc->start = mdstart_malloc; 1726 error = mdcreate_malloc(sc, mdr); 1727 break; 1728 case MD_PRELOAD: 1729 /* 1730 * We disallow attaching preloaded memory disks via 1731 * ioctl. Preloaded memory disks are automatically 1732 * attached in g_md_init(). 1733 */ 1734 error = EOPNOTSUPP; 1735 break; 1736 case MD_VNODE: 1737 sc->start = mdstart_vnode; 1738 error = mdcreate_vnode(sc, mdr, td); 1739 break; 1740 case MD_SWAP: 1741 sc->start = mdstart_swap; 1742 error = mdcreate_swap(sc, mdr, td); 1743 break; 1744 case MD_NULL: 1745 sc->start = mdstart_null; 1746 error = mdcreate_null(sc, mdr, td); 1747 break; 1748 } 1749 err_after_new: 1750 if (error != 0) { 1751 mddestroy(sc, td); 1752 return (error); 1753 } 1754 1755 /* Prune off any residual fractional sector */ 1756 i = sc->mediasize % sc->sectorsize; 1757 sc->mediasize -= i; 1758 1759 mdinit(sc); 1760 return (0); 1761 } 1762 1763 static int 1764 kern_mdattach(struct thread *td, struct md_req *mdr) 1765 { 1766 int error; 1767 1768 sx_xlock(&md_sx); 1769 error = kern_mdattach_locked(td, mdr); 1770 sx_xunlock(&md_sx); 1771 return (error); 1772 } 1773 1774 static int 1775 kern_mddetach_locked(struct thread *td, struct md_req *mdr) 1776 { 1777 struct md_s *sc; 1778 1779 sx_assert(&md_sx, SA_XLOCKED); 1780 1781 if (mdr->md_mediasize != 0 || 1782 (mdr->md_options & ~MD_FORCE) != 0) 1783 return (EINVAL); 1784 1785 sc = mdfind(mdr->md_unit); 1786 if (sc == NULL) 1787 return (ENOENT); 1788 if (sc->opencount != 0 && !(sc->flags & MD_FORCE) && 1789 !(mdr->md_options & MD_FORCE)) 1790 return (EBUSY); 1791 return (mddestroy(sc, td)); 1792 } 1793 1794 static int 1795 kern_mddetach(struct thread *td, struct md_req *mdr) 1796 { 1797 int error; 1798 1799 sx_xlock(&md_sx); 1800 error = kern_mddetach_locked(td, mdr); 1801 sx_xunlock(&md_sx); 1802 return (error); 1803 } 1804 1805 static int 1806 kern_mdresize_locked(struct md_req *mdr) 1807 { 1808 struct md_s *sc; 1809 1810 sx_assert(&md_sx, SA_XLOCKED); 1811 1812 if ((mdr->md_options & ~(MD_FORCE | MD_RESERVE)) != 0) 1813 return (EINVAL); 1814 1815 sc = mdfind(mdr->md_unit); 1816 if (sc == NULL) 1817 return (ENOENT); 1818 if (mdr->md_mediasize < sc->sectorsize) 1819 return (EINVAL); 1820 if (mdr->md_mediasize < sc->mediasize && 1821 !(sc->flags & MD_FORCE) && 1822 !(mdr->md_options & MD_FORCE)) 1823 return (EBUSY); 1824 return (mdresize(sc, mdr)); 1825 } 1826 1827 static int 1828 kern_mdresize(struct md_req *mdr) 1829 { 1830 int error; 1831 1832 sx_xlock(&md_sx); 1833 error = kern_mdresize_locked(mdr); 1834 sx_xunlock(&md_sx); 1835 return (error); 1836 } 1837 1838 static int 1839 kern_mdquery_locked(struct md_req *mdr) 1840 { 1841 struct md_s *sc; 1842 int error; 1843 1844 sx_assert(&md_sx, SA_XLOCKED); 1845 1846 sc = mdfind(mdr->md_unit); 1847 if (sc == NULL) 1848 return (ENOENT); 1849 mdr->md_type = sc->type; 1850 mdr->md_options = sc->flags; 1851 mdr->md_mediasize = sc->mediasize; 1852 mdr->md_sectorsize = sc->sectorsize; 1853 error = 0; 1854 if (mdr->md_label != NULL) { 1855 error = copyout(sc->label, mdr->md_label, 1856 strlen(sc->label) + 1); 1857 if (error != 0) 1858 return (error); 1859 } 1860 if (sc->type == MD_VNODE || 1861 (sc->type == MD_PRELOAD && mdr->md_file != NULL)) 1862 error = copyout(sc->file, mdr->md_file, 1863 strlen(sc->file) + 1); 1864 return (error); 1865 } 1866 1867 static int 1868 kern_mdquery(struct md_req *mdr) 1869 { 1870 int error; 1871 1872 sx_xlock(&md_sx); 1873 error = kern_mdquery_locked(mdr); 1874 sx_xunlock(&md_sx); 1875 return (error); 1876 } 1877 1878 /* Copy members that are not userspace pointers. */ 1879 #define MD_IOCTL2REQ(mdio, mdr) do { \ 1880 (mdr)->md_unit = (mdio)->md_unit; \ 1881 (mdr)->md_type = (mdio)->md_type; \ 1882 (mdr)->md_mediasize = (mdio)->md_mediasize; \ 1883 (mdr)->md_sectorsize = (mdio)->md_sectorsize; \ 1884 (mdr)->md_options = (mdio)->md_options; \ 1885 (mdr)->md_fwheads = (mdio)->md_fwheads; \ 1886 (mdr)->md_fwsectors = (mdio)->md_fwsectors; \ 1887 (mdr)->md_units = &(mdio)->md_pad[0]; \ 1888 (mdr)->md_units_nitems = nitems((mdio)->md_pad); \ 1889 } while(0) 1890 1891 /* Copy members that might have been updated */ 1892 #define MD_REQ2IOCTL(mdr, mdio) do { \ 1893 (mdio)->md_unit = (mdr)->md_unit; \ 1894 (mdio)->md_type = (mdr)->md_type; \ 1895 (mdio)->md_mediasize = (mdr)->md_mediasize; \ 1896 (mdio)->md_sectorsize = (mdr)->md_sectorsize; \ 1897 (mdio)->md_options = (mdr)->md_options; \ 1898 (mdio)->md_fwheads = (mdr)->md_fwheads; \ 1899 (mdio)->md_fwsectors = (mdr)->md_fwsectors; \ 1900 } while(0) 1901 1902 static int 1903 mdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, 1904 struct thread *td) 1905 { 1906 struct md_req mdr; 1907 int error; 1908 1909 if (md_debug) 1910 printf("mdctlioctl(%s %lx %p %x %p)\n", 1911 devtoname(dev), cmd, addr, flags, td); 1912 1913 bzero(&mdr, sizeof(mdr)); 1914 switch (cmd) { 1915 case MDIOCATTACH: 1916 case MDIOCDETACH: 1917 case MDIOCRESIZE: 1918 case MDIOCQUERY: { 1919 struct md_ioctl *mdio = (struct md_ioctl *)addr; 1920 if (mdio->md_version != MDIOVERSION) 1921 return (EINVAL); 1922 MD_IOCTL2REQ(mdio, &mdr); 1923 mdr.md_file = mdio->md_file; 1924 mdr.md_file_seg = UIO_USERSPACE; 1925 /* If the file is adjacent to the md_ioctl it's in kernel. */ 1926 if ((void *)mdio->md_file == (void *)(mdio + 1)) 1927 mdr.md_file_seg = UIO_SYSSPACE; 1928 mdr.md_label = mdio->md_label; 1929 break; 1930 } 1931 #ifdef COMPAT_FREEBSD32 1932 case MDIOCATTACH_32: 1933 case MDIOCDETACH_32: 1934 case MDIOCRESIZE_32: 1935 case MDIOCQUERY_32: { 1936 struct md_ioctl32 *mdio = (struct md_ioctl32 *)addr; 1937 if (mdio->md_version != MDIOVERSION) 1938 return (EINVAL); 1939 MD_IOCTL2REQ(mdio, &mdr); 1940 mdr.md_file = (void *)(uintptr_t)mdio->md_file; 1941 mdr.md_file_seg = UIO_USERSPACE; 1942 mdr.md_label = (void *)(uintptr_t)mdio->md_label; 1943 break; 1944 } 1945 #endif 1946 default: 1947 /* Fall through to handler switch. */ 1948 break; 1949 } 1950 1951 error = 0; 1952 switch (cmd) { 1953 case MDIOCATTACH: 1954 #ifdef COMPAT_FREEBSD32 1955 case MDIOCATTACH_32: 1956 #endif 1957 error = kern_mdattach(td, &mdr); 1958 break; 1959 case MDIOCDETACH: 1960 #ifdef COMPAT_FREEBSD32 1961 case MDIOCDETACH_32: 1962 #endif 1963 error = kern_mddetach(td, &mdr); 1964 break; 1965 case MDIOCRESIZE: 1966 #ifdef COMPAT_FREEBSD32 1967 case MDIOCRESIZE_32: 1968 #endif 1969 error = kern_mdresize(&mdr); 1970 break; 1971 case MDIOCQUERY: 1972 #ifdef COMPAT_FREEBSD32 1973 case MDIOCQUERY_32: 1974 #endif 1975 error = kern_mdquery(&mdr); 1976 break; 1977 default: 1978 error = ENOIOCTL; 1979 } 1980 1981 switch (cmd) { 1982 case MDIOCATTACH: 1983 case MDIOCQUERY: { 1984 struct md_ioctl *mdio = (struct md_ioctl *)addr; 1985 MD_REQ2IOCTL(&mdr, mdio); 1986 break; 1987 } 1988 #ifdef COMPAT_FREEBSD32 1989 case MDIOCATTACH_32: 1990 case MDIOCQUERY_32: { 1991 struct md_ioctl32 *mdio = (struct md_ioctl32 *)addr; 1992 MD_REQ2IOCTL(&mdr, mdio); 1993 break; 1994 } 1995 #endif 1996 default: 1997 /* Other commands to not alter mdr. */ 1998 break; 1999 } 2000 2001 return (error); 2002 } 2003 2004 static void 2005 md_preloaded(u_char *image, size_t length, const char *name) 2006 { 2007 struct md_s *sc; 2008 int error; 2009 2010 sc = mdnew(-1, &error, MD_PRELOAD); 2011 if (sc == NULL) 2012 return; 2013 sc->mediasize = length; 2014 sc->sectorsize = DEV_BSIZE; 2015 sc->pl_ptr = image; 2016 sc->pl_len = length; 2017 sc->start = mdstart_preload; 2018 if (name != NULL) 2019 strlcpy(sc->file, name, sizeof(sc->file)); 2020 #ifdef MD_ROOT 2021 if (sc->unit == 0) { 2022 #ifndef ROOTDEVNAME 2023 rootdevnames[0] = MD_ROOT_FSTYPE ":/dev/md0"; 2024 #endif 2025 #ifdef MD_ROOT_READONLY 2026 sc->flags |= MD_READONLY; 2027 #endif 2028 } 2029 #endif 2030 mdinit(sc); 2031 if (name != NULL) { 2032 printf("%s%d: Preloaded image <%s> %zd bytes at %p\n", 2033 MD_NAME, sc->unit, name, length, image); 2034 } else { 2035 printf("%s%d: Embedded image %zd bytes at %p\n", 2036 MD_NAME, sc->unit, length, image); 2037 } 2038 } 2039 2040 static void 2041 g_md_init(struct g_class *mp __unused) 2042 { 2043 caddr_t mod; 2044 u_char *ptr, *name, *type; 2045 unsigned len; 2046 int i; 2047 2048 /* figure out log2(NINDIR) */ 2049 for (i = NINDIR, nshift = -1; i; nshift++) 2050 i >>= 1; 2051 2052 mod = NULL; 2053 sx_init(&md_sx, "MD config lock"); 2054 g_topology_unlock(); 2055 md_uh = new_unrhdr(0, INT_MAX, NULL); 2056 #ifdef MD_ROOT 2057 if (mfs_root_size != 0) { 2058 sx_xlock(&md_sx); 2059 #ifdef MD_ROOT_MEM 2060 md_preloaded(mfs_root, mfs_root_size, NULL); 2061 #else 2062 md_preloaded(__DEVOLATILE(u_char *, &mfs_root), mfs_root_size, 2063 NULL); 2064 #endif 2065 sx_xunlock(&md_sx); 2066 } 2067 #endif 2068 /* XXX: are preload_* static or do they need Giant ? */ 2069 while ((mod = preload_search_next_name(mod)) != NULL) { 2070 name = (char *)preload_search_info(mod, MODINFO_NAME); 2071 if (name == NULL) 2072 continue; 2073 type = (char *)preload_search_info(mod, MODINFO_TYPE); 2074 if (type == NULL) 2075 continue; 2076 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 2077 continue; 2078 ptr = preload_fetch_addr(mod); 2079 len = preload_fetch_size(mod); 2080 if (ptr != NULL && len != 0) { 2081 sx_xlock(&md_sx); 2082 md_preloaded(ptr, len, name); 2083 sx_xunlock(&md_sx); 2084 } 2085 } 2086 md_pbuf_zone = pbuf_zsecond_create("mdpbuf", nswbuf / 10); 2087 status_dev = make_dev(&mdctl_cdevsw, INT_MAX, UID_ROOT, GID_WHEEL, 2088 0600, MDCTL_NAME); 2089 g_topology_lock(); 2090 } 2091 2092 static void 2093 g_md_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 2094 struct g_consumer *cp __unused, struct g_provider *pp) 2095 { 2096 struct md_s *mp; 2097 char *type; 2098 2099 mp = gp->softc; 2100 if (mp == NULL) 2101 return; 2102 2103 switch (mp->type) { 2104 case MD_MALLOC: 2105 type = "malloc"; 2106 break; 2107 case MD_PRELOAD: 2108 type = "preload"; 2109 break; 2110 case MD_VNODE: 2111 type = "vnode"; 2112 break; 2113 case MD_SWAP: 2114 type = "swap"; 2115 break; 2116 case MD_NULL: 2117 type = "null"; 2118 break; 2119 default: 2120 type = "unknown"; 2121 break; 2122 } 2123 2124 if (pp != NULL) { 2125 if (indent == NULL) { 2126 sbuf_printf(sb, " u %d", mp->unit); 2127 sbuf_printf(sb, " s %ju", (uintmax_t) mp->sectorsize); 2128 sbuf_printf(sb, " f %ju", (uintmax_t) mp->fwheads); 2129 sbuf_printf(sb, " fs %ju", (uintmax_t) mp->fwsectors); 2130 sbuf_printf(sb, " l %ju", (uintmax_t) mp->mediasize); 2131 sbuf_printf(sb, " t %s", type); 2132 if ((mp->type == MD_VNODE && mp->vnode != NULL) || 2133 (mp->type == MD_PRELOAD && mp->file[0] != '\0')) 2134 sbuf_printf(sb, " file %s", mp->file); 2135 sbuf_printf(sb, " label %s", mp->label); 2136 } else { 2137 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent, 2138 mp->unit); 2139 sbuf_printf(sb, "%s<sectorsize>%ju</sectorsize>\n", 2140 indent, (uintmax_t) mp->sectorsize); 2141 sbuf_printf(sb, "%s<fwheads>%ju</fwheads>\n", 2142 indent, (uintmax_t) mp->fwheads); 2143 sbuf_printf(sb, "%s<fwsectors>%ju</fwsectors>\n", 2144 indent, (uintmax_t) mp->fwsectors); 2145 if (mp->ident[0] != '\0') { 2146 sbuf_printf(sb, "%s<ident>", indent); 2147 g_conf_printf_escaped(sb, "%s", mp->ident); 2148 sbuf_printf(sb, "</ident>\n"); 2149 } 2150 sbuf_printf(sb, "%s<length>%ju</length>\n", 2151 indent, (uintmax_t) mp->mediasize); 2152 sbuf_printf(sb, "%s<compression>%s</compression>\n", indent, 2153 (mp->flags & MD_COMPRESS) == 0 ? "off": "on"); 2154 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 2155 (mp->flags & MD_READONLY) == 0 ? "read-write": 2156 "read-only"); 2157 sbuf_printf(sb, "%s<type>%s</type>\n", indent, 2158 type); 2159 if ((mp->type == MD_VNODE && mp->vnode != NULL) || 2160 (mp->type == MD_PRELOAD && mp->file[0] != '\0')) { 2161 sbuf_printf(sb, "%s<file>", indent); 2162 g_conf_printf_escaped(sb, "%s", mp->file); 2163 sbuf_printf(sb, "</file>\n"); 2164 } 2165 if (mp->type == MD_VNODE) 2166 sbuf_printf(sb, "%s<cache>%s</cache>\n", indent, 2167 (mp->flags & MD_CACHE) == 0 ? "off": "on"); 2168 sbuf_printf(sb, "%s<label>", indent); 2169 g_conf_printf_escaped(sb, "%s", mp->label); 2170 sbuf_printf(sb, "</label>\n"); 2171 } 2172 } 2173 } 2174 2175 static void 2176 g_md_fini(struct g_class *mp __unused) 2177 { 2178 2179 sx_destroy(&md_sx); 2180 if (status_dev != NULL) 2181 destroy_dev(status_dev); 2182 uma_zdestroy(md_pbuf_zone); 2183 delete_unrhdr(md_uh); 2184 } 2185