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