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 */ 12 13 /*- 14 * The following functions are based on the historical vn(4) driver: 15 * mdstart_swap(), mdstart_vnode(), mdcreate_swap(), mdcreate_vnode() 16 * and mddestroy(), and as such under the following copyright: 17 * 18 * Copyright (c) 1988 University of Utah. 19 * Copyright (c) 1990, 1993 20 * The Regents of the University of California. All rights reserved. 21 * Copyright (c) 2013 The FreeBSD Foundation 22 * All rights reserved. 23 * 24 * This code is derived from software contributed to Berkeley by 25 * the Systems Programming Group of the University of Utah Computer 26 * Science Department. 27 * 28 * Portions of this software were developed by Konstantin Belousov 29 * under sponsorship from the FreeBSD Foundation. 30 * 31 * Redistribution and use in source and binary forms, with or without 32 * modification, are permitted provided that the following conditions 33 * are met: 34 * 1. Redistributions of source code must retain the above copyright 35 * notice, this list of conditions and the following disclaimer. 36 * 2. Redistributions in binary form must reproduce the above copyright 37 * notice, this list of conditions and the following disclaimer in the 38 * documentation and/or other materials provided with the distribution. 39 * 3. Neither the name of the University nor the names of its contributors 40 * may be used to endorse or promote products derived from this software 41 * without specific prior written permission. 42 * 43 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 44 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 46 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 49 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 51 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 52 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 53 * SUCH DAMAGE. 54 * 55 * from: Utah Hdr: vn.c 1.13 94/04/02 56 * From: src/sys/dev/vn/vn.c,v 1.122 2000/12/16 16:06:03 57 */ 58 59 #include "opt_rootdevname.h" 60 #include "opt_geom.h" 61 #include "opt_md.h" 62 63 #include <sys/systm.h> 64 #include <sys/bio.h> 65 #include <sys/buf.h> 66 #include <sys/bus.h> 67 #include <sys/conf.h> 68 #include <sys/devicestat.h> 69 #include <sys/disk.h> 70 #include <sys/fcntl.h> 71 #include <sys/kernel.h> 72 #include <sys/kthread.h> 73 #include <sys/limits.h> 74 #include <sys/linker.h> 75 #include <sys/lock.h> 76 #include <sys/malloc.h> 77 #include <sys/mdioctl.h> 78 #include <sys/mount.h> 79 #include <sys/mutex.h> 80 #include <sys/namei.h> 81 #include <sys/proc.h> 82 #include <sys/queue.h> 83 #include <sys/rwlock.h> 84 #include <sys/sx.h> 85 #include <sys/sbuf.h> 86 #include <sys/sched.h> 87 #include <sys/sf_buf.h> 88 #include <sys/sysctl.h> 89 #include <sys/uio.h> 90 #include <sys/unistd.h> 91 #include <sys/vnode.h> 92 93 #include <geom/geom.h> 94 #include <geom/geom_int.h> 95 96 #include <vm/vm.h> 97 #include <vm/vm_extern.h> 98 #include <vm/vm_param.h> 99 #include <vm/vm_object.h> 100 #include <vm/vm_page.h> 101 #include <vm/vm_pager.h> 102 #include <vm/swap_pager.h> 103 #include <vm/uma.h> 104 105 #include <machine/bus.h> 106 107 #define MD_MODVER 1 108 109 #define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */ 110 #define MD_EXITING 0x20000 /* Worker thread is exiting. */ 111 #define MD_PROVIDERGONE 0x40000 /* Safe to free the softc */ 112 113 #ifndef MD_NSECT 114 #define MD_NSECT (10000 * 2) 115 #endif 116 117 struct md_req { 118 unsigned md_unit; /* unit number */ 119 enum md_types md_type; /* type of disk */ 120 off_t md_mediasize; /* size of disk in bytes */ 121 unsigned md_sectorsize; /* sectorsize */ 122 unsigned md_options; /* options */ 123 int md_fwheads; /* firmware heads */ 124 int md_fwsectors; /* firmware sectors */ 125 char *md_file; /* pathname of file to mount */ 126 enum uio_seg md_file_seg; /* location of md_file */ 127 char *md_label; /* label of the device (userspace) */ 128 int *md_units; /* pointer to units array (kernel) */ 129 size_t md_units_nitems; /* items in md_units array */ 130 }; 131 132 #ifdef COMPAT_FREEBSD32 133 struct md_ioctl32 { 134 unsigned md_version; 135 unsigned md_unit; 136 enum md_types md_type; 137 uint32_t md_file; 138 off_t md_mediasize; 139 unsigned md_sectorsize; 140 unsigned md_options; 141 uint64_t md_base; 142 int md_fwheads; 143 int md_fwsectors; 144 uint32_t md_label; 145 int md_pad[MDNPAD]; 146 } 147 #ifdef __amd64__ 148 __attribute__((__packed__)) 149 #endif 150 ; 151 #ifndef __amd64__ 152 CTASSERT((sizeof(struct md_ioctl32)) == 440); 153 #else 154 CTASSERT((sizeof(struct md_ioctl32)) == 436); 155 #endif 156 157 #define MDIOCATTACH_32 _IOC_NEWTYPE(MDIOCATTACH, struct md_ioctl32) 158 #define MDIOCDETACH_32 _IOC_NEWTYPE(MDIOCDETACH, struct md_ioctl32) 159 #define MDIOCQUERY_32 _IOC_NEWTYPE(MDIOCQUERY, struct md_ioctl32) 160 #define MDIOCRESIZE_32 _IOC_NEWTYPE(MDIOCRESIZE, struct md_ioctl32) 161 #endif /* COMPAT_FREEBSD32 */ 162 163 static MALLOC_DEFINE(M_MD, "md_disk", "Memory Disk"); 164 static MALLOC_DEFINE(M_MDSECT, "md_sectors", "Memory Disk Sectors"); 165 166 static int md_debug; 167 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, 168 "Enable md(4) debug messages"); 169 static int md_malloc_wait; 170 SYSCTL_INT(_vm, OID_AUTO, md_malloc_wait, CTLFLAG_RW, &md_malloc_wait, 0, 171 "Allow malloc to wait for memory allocations"); 172 173 #if defined(MD_ROOT) && !defined(MD_ROOT_FSTYPE) 174 #define MD_ROOT_FSTYPE "ufs" 175 #endif 176 177 #if defined(MD_ROOT) 178 /* 179 * Preloaded image gets put here. 180 */ 181 #if defined(MD_ROOT_SIZE) 182 /* 183 * We put the mfs_root symbol into the oldmfs section of the kernel object file. 184 * Applications that patch the object with the image can determine 185 * the size looking at the oldmfs section size within the kernel. 186 */ 187 u_char mfs_root[MD_ROOT_SIZE*1024] __attribute__ ((section ("oldmfs"))); 188 const int mfs_root_size = sizeof(mfs_root); 189 #elif defined(MD_ROOT_MEM) 190 /* MD region already mapped in the memory */ 191 u_char *mfs_root; 192 int mfs_root_size; 193 #else 194 extern volatile u_char __weak_symbol mfs_root; 195 extern volatile u_char __weak_symbol mfs_root_end; 196 #define mfs_root_size ((uintptr_t)(&mfs_root_end - &mfs_root)) 197 #endif 198 #endif 199 200 static g_init_t g_md_init; 201 static g_fini_t g_md_fini; 202 static g_start_t g_md_start; 203 static g_access_t g_md_access; 204 static void g_md_dumpconf(struct sbuf *sb, const char *indent, 205 struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp); 206 static g_provgone_t g_md_providergone; 207 208 static struct cdev *status_dev = NULL; 209 static struct sx md_sx; 210 static struct unrhdr *md_uh; 211 212 static d_ioctl_t mdctlioctl; 213 214 static struct cdevsw mdctl_cdevsw = { 215 .d_version = D_VERSION, 216 .d_ioctl = mdctlioctl, 217 .d_name = MD_NAME, 218 }; 219 220 struct g_class g_md_class = { 221 .name = "MD", 222 .version = G_VERSION, 223 .init = g_md_init, 224 .fini = g_md_fini, 225 .start = g_md_start, 226 .access = g_md_access, 227 .dumpconf = g_md_dumpconf, 228 .providergone = g_md_providergone, 229 }; 230 231 DECLARE_GEOM_CLASS(g_md_class, g_md); 232 MODULE_VERSION(geom_md, 0); 233 234 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(md_softc_list); 235 236 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 237 #define NMASK (NINDIR-1) 238 static int nshift; 239 240 struct indir { 241 uintptr_t *array; 242 u_int total; 243 u_int used; 244 u_int shift; 245 }; 246 247 struct md_s { 248 int unit; 249 LIST_ENTRY(md_s) list; 250 struct bio_queue_head bio_queue; 251 struct mtx queue_mtx; 252 struct cdev *dev; 253 enum md_types type; 254 off_t mediasize; 255 unsigned sectorsize; 256 unsigned opencount; 257 unsigned fwheads; 258 unsigned fwsectors; 259 char ident[DISK_IDENT_SIZE]; 260 unsigned flags; 261 char name[20]; 262 struct proc *procp; 263 struct g_geom *gp; 264 struct g_provider *pp; 265 int (*start)(struct md_s *sc, struct bio *bp); 266 struct devstat *devstat; 267 struct ucred *cred; 268 char label[PATH_MAX]; 269 bool candelete; 270 271 union { 272 /* MD_MALLOC related fields */ 273 struct { 274 struct indir *indir; 275 uma_zone_t uma; 276 } s_malloc; 277 278 /* MD_PRELOAD related fields */ 279 struct { 280 u_char *pl_ptr; 281 size_t pl_len; 282 char name[PATH_MAX]; 283 } s_preload; 284 285 /* MD_VNODE related fields */ 286 struct { 287 struct vnode *vnode; 288 char file[PATH_MAX]; 289 char *kva; 290 } s_vnode; 291 292 /* MD_SWAP related fields */ 293 struct { 294 vm_object_t object; 295 } s_swap; 296 297 /* MD_NULL */ 298 struct { 299 } s_null; 300 }; 301 }; 302 303 static struct indir * 304 new_indir(u_int shift) 305 { 306 struct indir *ip; 307 308 ip = malloc(sizeof *ip, M_MD, (md_malloc_wait ? M_WAITOK : M_NOWAIT) 309 | M_ZERO); 310 if (ip == NULL) 311 return (NULL); 312 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 313 M_MDSECT, (md_malloc_wait ? M_WAITOK : M_NOWAIT) | M_ZERO); 314 if (ip->array == NULL) { 315 free(ip, M_MD); 316 return (NULL); 317 } 318 ip->total = NINDIR; 319 ip->shift = shift; 320 return (ip); 321 } 322 323 static void 324 del_indir(struct indir *ip) 325 { 326 327 free(ip->array, M_MDSECT); 328 free(ip, M_MD); 329 } 330 331 static void 332 destroy_indir(struct md_s *sc, struct indir *ip) 333 { 334 int i; 335 336 for (i = 0; i < NINDIR; i++) { 337 if (!ip->array[i]) 338 continue; 339 if (ip->shift) 340 destroy_indir(sc, (struct indir*)(ip->array[i])); 341 else if (ip->array[i] > 255) 342 uma_zfree(sc->s_malloc.uma, (void *)(ip->array[i])); 343 } 344 del_indir(ip); 345 } 346 347 /* 348 * This function does the math and allocates the top level "indir" structure 349 * for a device of "size" sectors. 350 */ 351 352 static struct indir * 353 dimension(off_t size) 354 { 355 off_t rcnt; 356 struct indir *ip; 357 int layer; 358 359 rcnt = size; 360 layer = 0; 361 while (rcnt > NINDIR) { 362 rcnt /= NINDIR; 363 layer++; 364 } 365 366 /* 367 * XXX: the top layer is probably not fully populated, so we allocate 368 * too much space for ip->array in here. 369 */ 370 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO); 371 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 372 M_MDSECT, M_WAITOK | M_ZERO); 373 ip->total = NINDIR; 374 ip->shift = layer * nshift; 375 return (ip); 376 } 377 378 /* 379 * Read a given sector 380 */ 381 382 static uintptr_t 383 s_read(struct indir *ip, off_t offset) 384 { 385 struct indir *cip; 386 int idx; 387 uintptr_t up; 388 389 if (md_debug > 1) 390 printf("s_read(%jd)\n", (intmax_t)offset); 391 up = 0; 392 for (cip = ip; cip != NULL;) { 393 if (cip->shift) { 394 idx = (offset >> cip->shift) & NMASK; 395 up = cip->array[idx]; 396 cip = (struct indir *)up; 397 continue; 398 } 399 idx = offset & NMASK; 400 return (cip->array[idx]); 401 } 402 return (0); 403 } 404 405 /* 406 * Write a given sector, prune the tree if the value is 0 407 */ 408 409 static int 410 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 411 { 412 struct indir *cip, *lip[10]; 413 int idx, li; 414 uintptr_t up; 415 416 if (md_debug > 1) 417 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 418 up = 0; 419 li = 0; 420 cip = ip; 421 for (;;) { 422 lip[li++] = cip; 423 if (cip->shift) { 424 idx = (offset >> cip->shift) & NMASK; 425 up = cip->array[idx]; 426 if (up != 0) { 427 cip = (struct indir *)up; 428 continue; 429 } 430 /* Allocate branch */ 431 cip->array[idx] = 432 (uintptr_t)new_indir(cip->shift - nshift); 433 if (cip->array[idx] == 0) 434 return (ENOSPC); 435 cip->used++; 436 up = cip->array[idx]; 437 cip = (struct indir *)up; 438 continue; 439 } 440 /* leafnode */ 441 idx = offset & NMASK; 442 up = cip->array[idx]; 443 if (up != 0) 444 cip->used--; 445 cip->array[idx] = ptr; 446 if (ptr != 0) 447 cip->used++; 448 break; 449 } 450 if (cip->used != 0 || li == 1) 451 return (0); 452 li--; 453 while (cip->used == 0 && cip != ip) { 454 li--; 455 idx = (offset >> lip[li]->shift) & NMASK; 456 up = lip[li]->array[idx]; 457 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 458 del_indir(cip); 459 lip[li]->array[idx] = 0; 460 lip[li]->used--; 461 cip = lip[li]; 462 } 463 return (0); 464 } 465 466 static int 467 g_md_access(struct g_provider *pp, int r, int w, int e) 468 { 469 struct md_s *sc; 470 471 sc = pp->geom->softc; 472 if (sc == NULL) { 473 if (r <= 0 && w <= 0 && e <= 0) 474 return (0); 475 return (ENXIO); 476 } 477 r += pp->acr; 478 w += pp->acw; 479 e += pp->ace; 480 if ((sc->flags & MD_READONLY) != 0 && w > 0) 481 return (EROFS); 482 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 483 sc->opencount = 1; 484 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 485 sc->opencount = 0; 486 } 487 return (0); 488 } 489 490 static void 491 g_md_start(struct bio *bp) 492 { 493 struct md_s *sc; 494 495 sc = bp->bio_to->geom->softc; 496 if ((bp->bio_cmd == BIO_READ) || (bp->bio_cmd == BIO_WRITE)) { 497 devstat_start_transaction_bio(sc->devstat, bp); 498 } 499 mtx_lock(&sc->queue_mtx); 500 bioq_disksort(&sc->bio_queue, bp); 501 wakeup(sc); 502 mtx_unlock(&sc->queue_mtx); 503 } 504 505 #define MD_MALLOC_MOVE_ZERO 1 506 #define MD_MALLOC_MOVE_FILL 2 507 #define MD_MALLOC_MOVE_READ 3 508 #define MD_MALLOC_MOVE_WRITE 4 509 #define MD_MALLOC_MOVE_CMP 5 510 511 static int 512 md_malloc_move_ma(vm_page_t **mp, int *ma_offs, unsigned sectorsize, 513 void *ptr, u_char fill, int op) 514 { 515 struct sf_buf *sf; 516 vm_page_t m, *mp1; 517 char *p, first; 518 off_t *uc; 519 unsigned n; 520 int error, i, ma_offs1, sz, first_read; 521 522 m = NULL; 523 error = 0; 524 sf = NULL; 525 /* if (op == MD_MALLOC_MOVE_CMP) { gcc */ 526 first = 0; 527 first_read = 0; 528 uc = ptr; 529 mp1 = *mp; 530 ma_offs1 = *ma_offs; 531 /* } */ 532 sched_pin(); 533 for (n = sectorsize; n != 0; n -= sz) { 534 sz = imin(PAGE_SIZE - *ma_offs, n); 535 if (m != **mp) { 536 if (sf != NULL) 537 sf_buf_free(sf); 538 m = **mp; 539 sf = sf_buf_alloc(m, SFB_CPUPRIVATE | 540 (md_malloc_wait ? 0 : SFB_NOWAIT)); 541 if (sf == NULL) { 542 error = ENOMEM; 543 break; 544 } 545 } 546 p = (char *)sf_buf_kva(sf) + *ma_offs; 547 switch (op) { 548 case MD_MALLOC_MOVE_ZERO: 549 bzero(p, sz); 550 break; 551 case MD_MALLOC_MOVE_FILL: 552 memset(p, fill, sz); 553 break; 554 case MD_MALLOC_MOVE_READ: 555 bcopy(ptr, p, sz); 556 cpu_flush_dcache(p, sz); 557 break; 558 case MD_MALLOC_MOVE_WRITE: 559 bcopy(p, ptr, sz); 560 break; 561 case MD_MALLOC_MOVE_CMP: 562 for (i = 0; i < sz; i++, p++) { 563 if (!first_read) { 564 *uc = (u_char)*p; 565 first = *p; 566 first_read = 1; 567 } else if (*p != first) { 568 error = EDOOFUS; 569 break; 570 } 571 } 572 break; 573 default: 574 KASSERT(0, ("md_malloc_move_ma unknown op %d\n", op)); 575 break; 576 } 577 if (error != 0) 578 break; 579 *ma_offs += sz; 580 *ma_offs %= PAGE_SIZE; 581 if (*ma_offs == 0) 582 (*mp)++; 583 ptr = (char *)ptr + sz; 584 } 585 586 if (sf != NULL) 587 sf_buf_free(sf); 588 sched_unpin(); 589 if (op == MD_MALLOC_MOVE_CMP && error != 0) { 590 *mp = mp1; 591 *ma_offs = ma_offs1; 592 } 593 return (error); 594 } 595 596 static int 597 md_malloc_move_vlist(bus_dma_segment_t **pvlist, int *pma_offs, 598 unsigned len, void *ptr, u_char fill, int op) 599 { 600 bus_dma_segment_t *vlist; 601 uint8_t *p, *end, first; 602 off_t *uc; 603 int ma_offs, seg_len; 604 605 vlist = *pvlist; 606 ma_offs = *pma_offs; 607 uc = ptr; 608 609 for (; len != 0; len -= seg_len) { 610 seg_len = imin(vlist->ds_len - ma_offs, len); 611 p = (uint8_t *)(uintptr_t)vlist->ds_addr + ma_offs; 612 switch (op) { 613 case MD_MALLOC_MOVE_ZERO: 614 bzero(p, seg_len); 615 break; 616 case MD_MALLOC_MOVE_FILL: 617 memset(p, fill, seg_len); 618 break; 619 case MD_MALLOC_MOVE_READ: 620 bcopy(ptr, p, seg_len); 621 cpu_flush_dcache(p, seg_len); 622 break; 623 case MD_MALLOC_MOVE_WRITE: 624 bcopy(p, ptr, seg_len); 625 break; 626 case MD_MALLOC_MOVE_CMP: 627 end = p + seg_len; 628 first = *uc = *p; 629 /* Confirm all following bytes match the first */ 630 while (++p < end) { 631 if (*p != first) 632 return (EDOOFUS); 633 } 634 break; 635 default: 636 KASSERT(0, ("md_malloc_move_vlist unknown op %d\n", op)); 637 break; 638 } 639 640 ma_offs += seg_len; 641 if (ma_offs == vlist->ds_len) { 642 ma_offs = 0; 643 vlist++; 644 } 645 ptr = (uint8_t *)ptr + seg_len; 646 } 647 *pvlist = vlist; 648 *pma_offs = ma_offs; 649 650 return (0); 651 } 652 653 static int 654 mdstart_malloc(struct md_s *sc, struct bio *bp) 655 { 656 u_char *dst; 657 vm_page_t *m; 658 bus_dma_segment_t *vlist; 659 int i, error, error1, ma_offs, notmapped; 660 off_t secno, nsec, uc; 661 uintptr_t sp, osp; 662 663 switch (bp->bio_cmd) { 664 case BIO_READ: 665 case BIO_WRITE: 666 case BIO_DELETE: 667 break; 668 case BIO_FLUSH: 669 return (0); 670 default: 671 return (EOPNOTSUPP); 672 } 673 674 notmapped = (bp->bio_flags & BIO_UNMAPPED) != 0; 675 vlist = (bp->bio_flags & BIO_VLIST) != 0 ? 676 (bus_dma_segment_t *)bp->bio_data : NULL; 677 if (notmapped) { 678 m = bp->bio_ma; 679 ma_offs = bp->bio_ma_offset; 680 dst = NULL; 681 KASSERT(vlist == NULL, ("vlists cannot be unmapped")); 682 } else if (vlist != NULL) { 683 ma_offs = bp->bio_ma_offset; 684 dst = NULL; 685 } else { 686 dst = bp->bio_data; 687 } 688 689 nsec = bp->bio_length / sc->sectorsize; 690 secno = bp->bio_offset / sc->sectorsize; 691 error = 0; 692 while (nsec--) { 693 osp = s_read(sc->s_malloc.indir, secno); 694 if (bp->bio_cmd == BIO_DELETE) { 695 if (osp != 0) 696 error = s_write(sc->s_malloc.indir, secno, 0); 697 } else if (bp->bio_cmd == BIO_READ) { 698 if (osp == 0) { 699 if (notmapped) { 700 error = md_malloc_move_ma(&m, &ma_offs, 701 sc->sectorsize, NULL, 0, 702 MD_MALLOC_MOVE_ZERO); 703 } else if (vlist != NULL) { 704 error = md_malloc_move_vlist(&vlist, 705 &ma_offs, sc->sectorsize, NULL, 0, 706 MD_MALLOC_MOVE_ZERO); 707 } else 708 bzero(dst, sc->sectorsize); 709 } else if (osp <= 255) { 710 if (notmapped) { 711 error = md_malloc_move_ma(&m, &ma_offs, 712 sc->sectorsize, NULL, osp, 713 MD_MALLOC_MOVE_FILL); 714 } else if (vlist != NULL) { 715 error = md_malloc_move_vlist(&vlist, 716 &ma_offs, sc->sectorsize, NULL, osp, 717 MD_MALLOC_MOVE_FILL); 718 } else 719 memset(dst, osp, sc->sectorsize); 720 } else { 721 if (notmapped) { 722 error = md_malloc_move_ma(&m, &ma_offs, 723 sc->sectorsize, (void *)osp, 0, 724 MD_MALLOC_MOVE_READ); 725 } else if (vlist != NULL) { 726 error = md_malloc_move_vlist(&vlist, 727 &ma_offs, sc->sectorsize, 728 (void *)osp, 0, 729 MD_MALLOC_MOVE_READ); 730 } else { 731 bcopy((void *)osp, dst, sc->sectorsize); 732 cpu_flush_dcache(dst, sc->sectorsize); 733 } 734 } 735 osp = 0; 736 } else if (bp->bio_cmd == BIO_WRITE) { 737 if (sc->flags & MD_COMPRESS) { 738 if (notmapped) { 739 error1 = md_malloc_move_ma(&m, &ma_offs, 740 sc->sectorsize, &uc, 0, 741 MD_MALLOC_MOVE_CMP); 742 i = error1 == 0 ? sc->sectorsize : 0; 743 } else if (vlist != NULL) { 744 error1 = md_malloc_move_vlist(&vlist, 745 &ma_offs, sc->sectorsize, &uc, 0, 746 MD_MALLOC_MOVE_CMP); 747 i = error1 == 0 ? sc->sectorsize : 0; 748 } else { 749 uc = dst[0]; 750 for (i = 1; i < sc->sectorsize; i++) { 751 if (dst[i] != uc) 752 break; 753 } 754 } 755 } else { 756 i = 0; 757 uc = 0; 758 } 759 if (i == sc->sectorsize) { 760 if (osp != uc) 761 error = s_write(sc->s_malloc.indir, 762 secno, uc); 763 } else { 764 if (osp <= 255) { 765 sp = (uintptr_t)uma_zalloc( 766 sc->s_malloc.uma, 767 md_malloc_wait ? M_WAITOK : 768 M_NOWAIT); 769 if (sp == 0) { 770 error = ENOSPC; 771 break; 772 } 773 if (notmapped) { 774 error = md_malloc_move_ma(&m, 775 &ma_offs, sc->sectorsize, 776 (void *)sp, 0, 777 MD_MALLOC_MOVE_WRITE); 778 } else if (vlist != NULL) { 779 error = md_malloc_move_vlist( 780 &vlist, &ma_offs, 781 sc->sectorsize, (void *)sp, 782 0, MD_MALLOC_MOVE_WRITE); 783 } else { 784 bcopy(dst, (void *)sp, 785 sc->sectorsize); 786 } 787 error = s_write(sc->s_malloc.indir, 788 secno, sp); 789 } else { 790 if (notmapped) { 791 error = md_malloc_move_ma(&m, 792 &ma_offs, sc->sectorsize, 793 (void *)osp, 0, 794 MD_MALLOC_MOVE_WRITE); 795 } else if (vlist != NULL) { 796 error = md_malloc_move_vlist( 797 &vlist, &ma_offs, 798 sc->sectorsize, (void *)osp, 799 0, MD_MALLOC_MOVE_WRITE); 800 } else { 801 bcopy(dst, (void *)osp, 802 sc->sectorsize); 803 } 804 osp = 0; 805 } 806 } 807 } else { 808 error = EOPNOTSUPP; 809 } 810 if (osp > 255) 811 uma_zfree(sc->s_malloc.uma, (void*)osp); 812 if (error != 0) 813 break; 814 secno++; 815 if (!notmapped && vlist == NULL) 816 dst += sc->sectorsize; 817 } 818 bp->bio_resid = 0; 819 return (error); 820 } 821 822 static void 823 mdcopyto_vlist(void *src, bus_dma_segment_t *vlist, off_t offset, off_t len) 824 { 825 off_t seg_len; 826 827 while (offset >= vlist->ds_len) { 828 offset -= vlist->ds_len; 829 vlist++; 830 } 831 832 while (len != 0) { 833 seg_len = omin(len, vlist->ds_len - offset); 834 bcopy(src, (void *)(uintptr_t)(vlist->ds_addr + offset), 835 seg_len); 836 offset = 0; 837 src = (uint8_t *)src + seg_len; 838 len -= seg_len; 839 vlist++; 840 } 841 } 842 843 static void 844 mdcopyfrom_vlist(bus_dma_segment_t *vlist, off_t offset, void *dst, off_t len) 845 { 846 off_t seg_len; 847 848 while (offset >= vlist->ds_len) { 849 offset -= vlist->ds_len; 850 vlist++; 851 } 852 853 while (len != 0) { 854 seg_len = omin(len, vlist->ds_len - offset); 855 bcopy((void *)(uintptr_t)(vlist->ds_addr + offset), dst, 856 seg_len); 857 offset = 0; 858 dst = (uint8_t *)dst + seg_len; 859 len -= seg_len; 860 vlist++; 861 } 862 } 863 864 static int 865 mdstart_preload(struct md_s *sc, struct bio *bp) 866 { 867 uint8_t *p; 868 869 p = sc->s_preload.pl_ptr + bp->bio_offset; 870 switch (bp->bio_cmd) { 871 case BIO_READ: 872 if ((bp->bio_flags & BIO_VLIST) != 0) { 873 mdcopyto_vlist(p, (bus_dma_segment_t *)bp->bio_data, 874 bp->bio_ma_offset, bp->bio_length); 875 } else { 876 bcopy(p, bp->bio_data, bp->bio_length); 877 } 878 cpu_flush_dcache(bp->bio_data, bp->bio_length); 879 break; 880 case BIO_WRITE: 881 if ((bp->bio_flags & BIO_VLIST) != 0) { 882 mdcopyfrom_vlist((bus_dma_segment_t *)bp->bio_data, 883 bp->bio_ma_offset, p, bp->bio_length); 884 } else { 885 bcopy(bp->bio_data, p, bp->bio_length); 886 } 887 break; 888 } 889 bp->bio_resid = 0; 890 return (0); 891 } 892 893 static int 894 mdstart_vnode(struct md_s *sc, struct bio *bp) 895 { 896 int error; 897 struct uio auio; 898 struct iovec aiov; 899 struct iovec *piov; 900 struct mount *mp; 901 struct vnode *vp; 902 bus_dma_segment_t *vlist; 903 struct thread *td; 904 off_t iolen, iostart, off, len; 905 int ma_offs, npages; 906 bool mapped; 907 908 td = curthread; 909 vp = sc->s_vnode.vnode; 910 piov = NULL; 911 ma_offs = bp->bio_ma_offset; 912 off = bp->bio_offset; 913 len = bp->bio_length; 914 mapped = false; 915 916 /* 917 * VNODE I/O 918 * 919 * If an error occurs, we set BIO_ERROR but we do not set 920 * B_INVAL because (for a write anyway), the buffer is 921 * still valid. 922 */ 923 924 switch (bp->bio_cmd) { 925 case BIO_READ: 926 auio.uio_rw = UIO_READ; 927 break; 928 case BIO_WRITE: 929 auio.uio_rw = UIO_WRITE; 930 break; 931 case BIO_FLUSH: 932 do { 933 (void)vn_start_write(vp, &mp, V_WAIT); 934 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 935 error = VOP_FSYNC(vp, MNT_WAIT, td); 936 VOP_UNLOCK(vp); 937 vn_finished_write(mp); 938 } while (error == ERELOOKUP); 939 return (error); 940 case BIO_DELETE: 941 if (sc->candelete) { 942 error = vn_deallocate(vp, &off, &len, 0, 943 sc->flags & MD_ASYNC ? 0 : IO_SYNC, 944 sc->cred, NOCRED); 945 bp->bio_resid = len; 946 return (error); 947 } 948 /* FALLTHROUGH */ 949 default: 950 return (EOPNOTSUPP); 951 } 952 953 auio.uio_offset = (vm_ooffset_t)bp->bio_offset; 954 auio.uio_resid = bp->bio_length; 955 auio.uio_segflg = UIO_SYSSPACE; 956 auio.uio_td = td; 957 958 if ((bp->bio_flags & BIO_VLIST) != 0) { 959 piov = malloc(sizeof(*piov) * bp->bio_ma_n, M_MD, M_WAITOK); 960 auio.uio_iov = piov; 961 vlist = (bus_dma_segment_t *)bp->bio_data; 962 while (len > 0) { 963 piov->iov_base = (void *)(uintptr_t)(vlist->ds_addr + 964 ma_offs); 965 piov->iov_len = vlist->ds_len - ma_offs; 966 if (piov->iov_len > len) 967 piov->iov_len = len; 968 len -= piov->iov_len; 969 ma_offs = 0; 970 vlist++; 971 piov++; 972 } 973 auio.uio_iovcnt = piov - auio.uio_iov; 974 piov = auio.uio_iov; 975 } else if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 976 bp->bio_resid = len; 977 unmapped_step: 978 npages = atop(min(maxphys, round_page(len + (ma_offs & 979 PAGE_MASK)))); 980 iolen = min(ptoa(npages) - (ma_offs & PAGE_MASK), len); 981 KASSERT(iolen > 0, ("zero iolen")); 982 KASSERT(npages <= atop(maxphys + PAGE_SIZE), 983 ("npages %d too large", npages)); 984 pmap_qenter(sc->s_vnode.kva, &bp->bio_ma[atop(ma_offs)], 985 npages); 986 aiov.iov_base = sc->s_vnode.kva + (ma_offs & PAGE_MASK); 987 aiov.iov_len = iolen; 988 auio.uio_iov = &aiov; 989 auio.uio_iovcnt = 1; 990 auio.uio_resid = iolen; 991 mapped = true; 992 } else { 993 aiov.iov_base = bp->bio_data; 994 aiov.iov_len = bp->bio_length; 995 auio.uio_iov = &aiov; 996 auio.uio_iovcnt = 1; 997 } 998 iostart = auio.uio_offset; 999 if (bp->bio_cmd == BIO_READ) { 1000 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1001 error = VOP_READ(vp, &auio, 0, sc->cred); 1002 VOP_UNLOCK(vp); 1003 } else { 1004 (void) vn_start_write(vp, &mp, V_WAIT); 1005 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1006 error = VOP_WRITE(vp, &auio, sc->flags & MD_ASYNC ? 0 : IO_SYNC, 1007 sc->cred); 1008 VOP_UNLOCK(vp); 1009 vn_finished_write(mp); 1010 if (error == 0) 1011 sc->flags &= ~MD_VERIFY; 1012 } 1013 1014 /* When MD_CACHE is set, try to avoid double-caching the data. */ 1015 if (error == 0 && (sc->flags & MD_CACHE) == 0) 1016 VOP_ADVISE(vp, iostart, auio.uio_offset - 1, 1017 POSIX_FADV_DONTNEED); 1018 1019 if (mapped) { 1020 pmap_qremove(sc->s_vnode.kva, npages); 1021 if (error == 0) { 1022 len -= iolen; 1023 bp->bio_resid -= iolen; 1024 ma_offs += iolen; 1025 if (len > 0) 1026 goto unmapped_step; 1027 } 1028 } else { 1029 bp->bio_resid = auio.uio_resid; 1030 } 1031 1032 free(piov, M_MD); 1033 return (error); 1034 } 1035 1036 static int 1037 mdstart_swap(struct md_s *sc, struct bio *bp) 1038 { 1039 vm_page_t m; 1040 u_char *p; 1041 vm_pindex_t i, lastp; 1042 bus_dma_segment_t *vlist; 1043 int rv, ma_offs, offs, len, lastend; 1044 1045 switch (bp->bio_cmd) { 1046 case BIO_READ: 1047 case BIO_WRITE: 1048 case BIO_DELETE: 1049 break; 1050 case BIO_FLUSH: 1051 return (0); 1052 default: 1053 return (EOPNOTSUPP); 1054 } 1055 1056 p = bp->bio_data; 1057 ma_offs = (bp->bio_flags & (BIO_UNMAPPED|BIO_VLIST)) != 0 ? 1058 bp->bio_ma_offset : 0; 1059 vlist = (bp->bio_flags & BIO_VLIST) != 0 ? 1060 (bus_dma_segment_t *)bp->bio_data : NULL; 1061 1062 /* 1063 * offs is the offset at which to start operating on the 1064 * next (ie, first) page. lastp is the last page on 1065 * which we're going to operate. lastend is the ending 1066 * position within that last page (ie, PAGE_SIZE if 1067 * we're operating on complete aligned pages). 1068 */ 1069 offs = bp->bio_offset % PAGE_SIZE; 1070 lastp = (bp->bio_offset + bp->bio_length - 1) / PAGE_SIZE; 1071 lastend = (bp->bio_offset + bp->bio_length - 1) % PAGE_SIZE + 1; 1072 1073 rv = VM_PAGER_OK; 1074 vm_object_pip_add(sc->s_swap.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_unlocked(sc->s_swap.object, i, 1078 VM_ALLOC_SYSTEM); 1079 if (bp->bio_cmd == BIO_READ) { 1080 if (vm_page_all_valid(m)) 1081 rv = VM_PAGER_OK; 1082 else 1083 rv = vm_pager_get_pages(sc->s_swap.object, 1084 &m, 1, NULL, NULL); 1085 if (rv == VM_PAGER_ERROR) { 1086 VM_OBJECT_WLOCK(sc->s_swap.object); 1087 vm_page_free(m); 1088 VM_OBJECT_WUNLOCK(sc->s_swap.object); 1089 break; 1090 } else if (rv == VM_PAGER_FAIL) { 1091 /* 1092 * Pager does not have the page. Zero 1093 * the allocated page, and mark it as 1094 * valid. Do not set dirty, the page 1095 * can be recreated if thrown out. 1096 */ 1097 pmap_zero_page(m); 1098 vm_page_valid(m); 1099 } 1100 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 1101 pmap_copy_pages(&m, offs, bp->bio_ma, 1102 ma_offs, len); 1103 } else if ((bp->bio_flags & BIO_VLIST) != 0) { 1104 physcopyout_vlist(VM_PAGE_TO_PHYS(m) + offs, 1105 vlist, ma_offs, len); 1106 cpu_flush_dcache(p, len); 1107 } else { 1108 physcopyout(VM_PAGE_TO_PHYS(m) + offs, p, len); 1109 cpu_flush_dcache(p, len); 1110 } 1111 } else if (bp->bio_cmd == BIO_WRITE) { 1112 if (len == PAGE_SIZE || vm_page_all_valid(m)) 1113 rv = VM_PAGER_OK; 1114 else 1115 rv = vm_pager_get_pages(sc->s_swap.object, 1116 &m, 1, NULL, NULL); 1117 if (rv == VM_PAGER_ERROR) { 1118 VM_OBJECT_WLOCK(sc->s_swap.object); 1119 vm_page_free(m); 1120 VM_OBJECT_WUNLOCK(sc->s_swap.object); 1121 break; 1122 } else if (rv == VM_PAGER_FAIL) 1123 pmap_zero_page(m); 1124 1125 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 1126 pmap_copy_pages(bp->bio_ma, ma_offs, &m, 1127 offs, len); 1128 } else if ((bp->bio_flags & BIO_VLIST) != 0) { 1129 physcopyin_vlist(vlist, ma_offs, 1130 VM_PAGE_TO_PHYS(m) + offs, len); 1131 } else { 1132 physcopyin(p, VM_PAGE_TO_PHYS(m) + offs, len); 1133 } 1134 1135 vm_page_valid(m); 1136 vm_page_set_dirty(m); 1137 } else if (bp->bio_cmd == BIO_DELETE) { 1138 if (len == PAGE_SIZE || vm_page_all_valid(m)) 1139 rv = VM_PAGER_OK; 1140 else 1141 rv = vm_pager_get_pages(sc->s_swap.object, 1142 &m, 1, NULL, NULL); 1143 VM_OBJECT_WLOCK(sc->s_swap.object); 1144 if (rv == VM_PAGER_ERROR) { 1145 vm_page_free(m); 1146 VM_OBJECT_WUNLOCK(sc->s_swap.object); 1147 break; 1148 } else if (rv == VM_PAGER_FAIL) { 1149 vm_page_free(m); 1150 m = NULL; 1151 } else { 1152 /* Page is valid. */ 1153 if (len != PAGE_SIZE) { 1154 pmap_zero_page_area(m, offs, len); 1155 vm_page_set_dirty(m); 1156 } else { 1157 vm_pager_page_unswapped(m); 1158 vm_page_free(m); 1159 m = NULL; 1160 } 1161 } 1162 VM_OBJECT_WUNLOCK(sc->s_swap.object); 1163 } 1164 if (m != NULL) { 1165 /* 1166 * The page may be deactivated prior to setting 1167 * PGA_REFERENCED, but in this case it will be 1168 * reactivated by the page daemon. 1169 */ 1170 if (vm_page_active(m)) 1171 vm_page_reference(m); 1172 else 1173 vm_page_activate(m); 1174 vm_page_xunbusy(m); 1175 } 1176 1177 /* Actions on further pages start at offset 0 */ 1178 p += PAGE_SIZE - offs; 1179 offs = 0; 1180 ma_offs += len; 1181 } 1182 vm_object_pip_wakeup(sc->s_swap.object); 1183 return (rv != VM_PAGER_ERROR ? 0 : ENOSPC); 1184 } 1185 1186 static int 1187 mdstart_null(struct md_s *sc, struct bio *bp) 1188 { 1189 1190 switch (bp->bio_cmd) { 1191 case BIO_READ: 1192 bzero(bp->bio_data, bp->bio_length); 1193 cpu_flush_dcache(bp->bio_data, bp->bio_length); 1194 break; 1195 case BIO_WRITE: 1196 break; 1197 } 1198 bp->bio_resid = 0; 1199 return (0); 1200 } 1201 1202 static void 1203 md_handleattr(struct md_s *sc, struct bio *bp) 1204 { 1205 if (sc->fwsectors && sc->fwheads && 1206 (g_handleattr_int(bp, "GEOM::fwsectors", sc->fwsectors) != 0 || 1207 g_handleattr_int(bp, "GEOM::fwheads", sc->fwheads) != 0)) 1208 return; 1209 if (g_handleattr_int(bp, "GEOM::candelete", sc->candelete) != 0) 1210 return; 1211 if (sc->ident[0] != '\0' && 1212 g_handleattr_str(bp, "GEOM::ident", sc->ident) != 0) 1213 return; 1214 if (g_handleattr_int(bp, "MNT::verified", (sc->flags & MD_VERIFY) != 0)) 1215 return; 1216 g_io_deliver(bp, EOPNOTSUPP); 1217 } 1218 1219 static void 1220 md_kthread(void *arg) 1221 { 1222 struct md_s *sc; 1223 struct bio *bp; 1224 int error; 1225 1226 sc = arg; 1227 thread_lock(curthread); 1228 sched_prio(curthread, PRIBIO); 1229 thread_unlock(curthread); 1230 if (sc->type == MD_VNODE) 1231 curthread->td_pflags |= TDP_NORUNNINGBUF; 1232 1233 for (;;) { 1234 mtx_lock(&sc->queue_mtx); 1235 if (sc->flags & MD_SHUTDOWN) { 1236 sc->flags |= MD_EXITING; 1237 mtx_unlock(&sc->queue_mtx); 1238 kproc_exit(0); 1239 } 1240 bp = bioq_takefirst(&sc->bio_queue); 1241 if (!bp) { 1242 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 1243 continue; 1244 } 1245 mtx_unlock(&sc->queue_mtx); 1246 if (bp->bio_cmd == BIO_GETATTR) { 1247 md_handleattr(sc, bp); 1248 } else { 1249 error = sc->start(sc, bp); 1250 if (bp->bio_cmd == BIO_READ || bp->bio_cmd == BIO_WRITE) { 1251 /* 1252 * Devstat uses (bio_bcount, bio_resid) for 1253 * determining the length of the completed part 1254 * of the i/o. g_io_deliver() will translate 1255 * from bio_completed to that, but it also 1256 * destroys the bio so we must do our own 1257 * translation. 1258 */ 1259 bp->bio_bcount = bp->bio_length; 1260 devstat_end_transaction_bio(sc->devstat, bp); 1261 } 1262 bp->bio_completed = bp->bio_length - bp->bio_resid; 1263 g_io_deliver(bp, error); 1264 } 1265 } 1266 } 1267 1268 static struct md_s * 1269 mdfind(int unit) 1270 { 1271 struct md_s *sc; 1272 1273 LIST_FOREACH(sc, &md_softc_list, list) { 1274 if (sc->unit == unit) 1275 break; 1276 } 1277 return (sc); 1278 } 1279 1280 static struct md_s * 1281 mdnew(int unit, int *errp, enum md_types type) 1282 { 1283 struct md_s *sc; 1284 int error; 1285 1286 *errp = 0; 1287 if (unit == -1) 1288 unit = alloc_unr(md_uh); 1289 else 1290 unit = alloc_unr_specific(md_uh, unit); 1291 1292 if (unit == -1) { 1293 *errp = EBUSY; 1294 return (NULL); 1295 } 1296 1297 sc = malloc(sizeof(*sc), M_MD, M_WAITOK | M_ZERO); 1298 sc->type = type; 1299 bioq_init(&sc->bio_queue); 1300 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 1301 sc->unit = unit; 1302 sprintf(sc->name, "md%d", unit); 1303 LIST_INSERT_HEAD(&md_softc_list, sc, list); 1304 error = kproc_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 1305 if (error == 0) 1306 return (sc); 1307 LIST_REMOVE(sc, list); 1308 mtx_destroy(&sc->queue_mtx); 1309 free_unr(md_uh, sc->unit); 1310 free(sc, M_MD); 1311 *errp = error; 1312 return (NULL); 1313 } 1314 1315 static void 1316 mdinit(struct md_s *sc) 1317 { 1318 struct g_geom *gp; 1319 struct g_provider *pp; 1320 unsigned remn; 1321 1322 g_topology_lock(); 1323 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 1324 gp->softc = sc; 1325 pp = g_new_providerf(gp, "md%d", sc->unit); 1326 devstat_remove_entry(pp->stat); 1327 pp->stat = NULL; 1328 pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE; 1329 /* Prune off any residual fractional sector. */ 1330 remn = sc->mediasize % sc->sectorsize; 1331 if (remn != 0) { 1332 printf("md%d: truncating fractional last sector by %u bytes\n", 1333 sc->unit, remn); 1334 sc->mediasize -= remn; 1335 } 1336 pp->mediasize = sc->mediasize; 1337 pp->sectorsize = sc->sectorsize; 1338 switch (sc->type) { 1339 case MD_MALLOC: 1340 case MD_VNODE: 1341 case MD_SWAP: 1342 pp->flags |= G_PF_ACCEPT_UNMAPPED; 1343 break; 1344 case MD_PRELOAD: 1345 case MD_NULL: 1346 break; 1347 } 1348 sc->gp = gp; 1349 sc->pp = pp; 1350 sc->devstat = devstat_new_entry("md", sc->unit, sc->sectorsize, 1351 DEVSTAT_ALL_SUPPORTED, DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 1352 sc->devstat->id = pp; 1353 g_error_provider(pp, 0); 1354 g_topology_unlock(); 1355 } 1356 1357 static int 1358 mdcreate_malloc(struct md_s *sc, struct md_req *mdr) 1359 { 1360 uintptr_t sp; 1361 int error; 1362 off_t u; 1363 1364 error = 0; 1365 if (mdr->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 1366 return (EINVAL); 1367 if (mdr->md_sectorsize != 0 && !powerof2(mdr->md_sectorsize)) 1368 return (EINVAL); 1369 /* Compression doesn't make sense if we have reserved space */ 1370 if (mdr->md_options & MD_RESERVE) 1371 mdr->md_options &= ~MD_COMPRESS; 1372 if (mdr->md_fwsectors != 0) 1373 sc->fwsectors = mdr->md_fwsectors; 1374 if (mdr->md_fwheads != 0) 1375 sc->fwheads = mdr->md_fwheads; 1376 sc->flags = mdr->md_options & (MD_COMPRESS | MD_FORCE | MD_RESERVE); 1377 sc->s_malloc.indir = dimension(sc->mediasize / sc->sectorsize); 1378 sc->s_malloc.uma = uma_zcreate(sc->name, sc->sectorsize, NULL, NULL, 1379 NULL, NULL, 0x1ff, 0); 1380 if (mdr->md_options & MD_RESERVE) { 1381 off_t nsectors; 1382 1383 nsectors = sc->mediasize / sc->sectorsize; 1384 for (u = 0; u < nsectors; u++) { 1385 sp = (uintptr_t)uma_zalloc(sc->s_malloc.uma, 1386 (md_malloc_wait ? M_WAITOK : M_NOWAIT) | M_ZERO); 1387 if (sp != 0) 1388 error = s_write(sc->s_malloc.indir, u, sp); 1389 else 1390 error = ENOMEM; 1391 if (error != 0) 1392 break; 1393 } 1394 } 1395 return (error); 1396 } 1397 1398 static int 1399 mdsetcred(struct md_s *sc, struct ucred *cred) 1400 { 1401 char *tmpbuf; 1402 int error = 0; 1403 1404 /* 1405 * Set credits in our softc 1406 */ 1407 1408 if (sc->cred) 1409 crfree(sc->cred); 1410 sc->cred = crhold(cred); 1411 1412 /* 1413 * Horrible kludge to establish credentials for NFS XXX. 1414 */ 1415 1416 if (sc->type == MD_VNODE && sc->s_vnode.vnode != NULL) { 1417 struct uio auio; 1418 struct iovec aiov; 1419 1420 tmpbuf = malloc(sc->sectorsize, M_TEMP, M_WAITOK); 1421 bzero(&auio, sizeof(auio)); 1422 1423 aiov.iov_base = tmpbuf; 1424 aiov.iov_len = sc->sectorsize; 1425 auio.uio_iov = &aiov; 1426 auio.uio_iovcnt = 1; 1427 auio.uio_offset = 0; 1428 auio.uio_rw = UIO_READ; 1429 auio.uio_segflg = UIO_SYSSPACE; 1430 auio.uio_resid = aiov.iov_len; 1431 vn_lock(sc->s_vnode.vnode, LK_EXCLUSIVE | LK_RETRY); 1432 error = VOP_READ(sc->s_vnode.vnode, &auio, 0, sc->cred); 1433 VOP_UNLOCK(sc->s_vnode.vnode); 1434 free(tmpbuf, M_TEMP); 1435 } 1436 return (error); 1437 } 1438 1439 static int 1440 mdcreate_vnode(struct md_s *sc, struct md_req *mdr, struct thread *td) 1441 { 1442 struct vattr vattr; 1443 struct nameidata nd; 1444 char *fname; 1445 int error, flags; 1446 long v; 1447 1448 fname = mdr->md_file; 1449 if (mdr->md_file_seg == UIO_USERSPACE) { 1450 error = copyinstr(fname, sc->s_vnode.file, 1451 sizeof(sc->s_vnode.file), NULL); 1452 if (error != 0) 1453 return (error); 1454 } else if (mdr->md_file_seg == UIO_SYSSPACE) 1455 strlcpy(sc->s_vnode.file, fname, sizeof(sc->s_vnode.file)); 1456 else 1457 return (EDOOFUS); 1458 1459 /* 1460 * If the user specified that this is a read only device, don't 1461 * set the FWRITE mask before trying to open the backing store. 1462 */ 1463 flags = FREAD | ((mdr->md_options & MD_READONLY) ? 0 : FWRITE) \ 1464 | ((mdr->md_options & MD_VERIFY) ? O_VERIFY : 0); 1465 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, sc->s_vnode.file); 1466 error = vn_open(&nd, &flags, 0, NULL); 1467 if (error != 0) 1468 return (error); 1469 NDFREE_PNBUF(&nd); 1470 if (nd.ni_vp->v_type != VREG) { 1471 error = EINVAL; 1472 goto bad; 1473 } 1474 error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred); 1475 if (error != 0) 1476 goto bad; 1477 if ((mdr->md_options & MD_MUSTDEALLOC) != 0) { 1478 error = VOP_PATHCONF(nd.ni_vp, _PC_DEALLOC_PRESENT, &v); 1479 if (error != 0) 1480 goto bad; 1481 if (v == 0) 1482 sc->candelete = false; 1483 } 1484 if (VOP_ISLOCKED(nd.ni_vp) != LK_EXCLUSIVE) { 1485 vn_lock(nd.ni_vp, LK_UPGRADE | LK_RETRY); 1486 if (VN_IS_DOOMED(nd.ni_vp)) { 1487 /* Forced unmount. */ 1488 error = EBADF; 1489 goto bad; 1490 } 1491 } 1492 nd.ni_vp->v_vflag |= VV_MD; 1493 VOP_UNLOCK(nd.ni_vp); 1494 1495 if (mdr->md_fwsectors != 0) 1496 sc->fwsectors = mdr->md_fwsectors; 1497 if (mdr->md_fwheads != 0) 1498 sc->fwheads = mdr->md_fwheads; 1499 snprintf(sc->ident, sizeof(sc->ident), "MD-DEV%ju-INO%ju", 1500 (uintmax_t)vattr.va_fsid, (uintmax_t)vattr.va_fileid); 1501 sc->flags = mdr->md_options & (MD_ASYNC | MD_CACHE | MD_FORCE | 1502 MD_VERIFY | MD_MUSTDEALLOC); 1503 if (!(flags & FWRITE)) 1504 sc->flags |= MD_READONLY; 1505 sc->s_vnode.vnode = nd.ni_vp; 1506 1507 error = mdsetcred(sc, td->td_ucred); 1508 if (error != 0) { 1509 sc->s_vnode.vnode = NULL; 1510 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY); 1511 nd.ni_vp->v_vflag &= ~VV_MD; 1512 goto bad; 1513 } 1514 1515 sc->s_vnode.kva = kva_alloc(maxphys + PAGE_SIZE); 1516 return (0); 1517 bad: 1518 VOP_UNLOCK(nd.ni_vp); 1519 (void)vn_close(nd.ni_vp, flags, td->td_ucred, td); 1520 return (error); 1521 } 1522 1523 static void 1524 g_md_providergone(struct g_provider *pp) 1525 { 1526 struct md_s *sc = pp->geom->softc; 1527 1528 mtx_lock(&sc->queue_mtx); 1529 sc->flags |= MD_PROVIDERGONE; 1530 wakeup(&sc->flags); 1531 mtx_unlock(&sc->queue_mtx); 1532 } 1533 1534 static int 1535 mddestroy(struct md_s *sc, struct thread *td) 1536 { 1537 1538 if (sc->gp) { 1539 g_topology_lock(); 1540 g_wither_geom(sc->gp, ENXIO); 1541 g_topology_unlock(); 1542 1543 mtx_lock(&sc->queue_mtx); 1544 while (!(sc->flags & MD_PROVIDERGONE)) 1545 msleep(&sc->flags, &sc->queue_mtx, PRIBIO, "mddestroy", 0); 1546 mtx_unlock(&sc->queue_mtx); 1547 } 1548 if (sc->devstat) { 1549 devstat_remove_entry(sc->devstat); 1550 sc->devstat = NULL; 1551 } 1552 mtx_lock(&sc->queue_mtx); 1553 sc->flags |= MD_SHUTDOWN; 1554 wakeup(sc); 1555 while (!(sc->flags & MD_EXITING)) 1556 msleep(sc->procp, &sc->queue_mtx, PRIBIO, "mddestroy", hz / 10); 1557 mtx_unlock(&sc->queue_mtx); 1558 mtx_destroy(&sc->queue_mtx); 1559 switch (sc->type) { 1560 case MD_VNODE: 1561 if (sc->s_vnode.vnode != NULL) { 1562 vn_lock(sc->s_vnode.vnode, LK_EXCLUSIVE | LK_RETRY); 1563 sc->s_vnode.vnode->v_vflag &= ~VV_MD; 1564 VOP_UNLOCK(sc->s_vnode.vnode); 1565 (void)vn_close(sc->s_vnode.vnode, 1566 sc->flags & MD_READONLY ? FREAD : (FREAD|FWRITE), 1567 sc->cred, td); 1568 } 1569 if (sc->s_vnode.kva != NULL) 1570 kva_free(sc->s_vnode.kva, maxphys + PAGE_SIZE); 1571 break; 1572 case MD_SWAP: 1573 if (sc->s_swap.object != NULL) 1574 vm_object_deallocate(sc->s_swap.object); 1575 break; 1576 case MD_MALLOC: 1577 if (sc->s_malloc.indir != NULL) 1578 destroy_indir(sc, sc->s_malloc.indir); 1579 if (sc->s_malloc.uma != NULL) 1580 uma_zdestroy(sc->s_malloc.uma); 1581 break; 1582 case MD_PRELOAD: 1583 case MD_NULL: 1584 break; 1585 default: 1586 __assert_unreachable(); 1587 } 1588 if (sc->cred != NULL) 1589 crfree(sc->cred); 1590 1591 LIST_REMOVE(sc, list); 1592 free_unr(md_uh, sc->unit); 1593 free(sc, M_MD); 1594 return (0); 1595 } 1596 1597 static int 1598 mdresize(struct md_s *sc, struct md_req *mdr) 1599 { 1600 int error, res; 1601 vm_pindex_t oldpages, newpages; 1602 1603 switch (sc->type) { 1604 case MD_VNODE: 1605 case MD_NULL: 1606 break; 1607 case MD_SWAP: 1608 if (mdr->md_mediasize <= 0 || 1609 (mdr->md_mediasize % PAGE_SIZE) != 0) 1610 return (EDOM); 1611 oldpages = OFF_TO_IDX(sc->mediasize); 1612 newpages = OFF_TO_IDX(mdr->md_mediasize); 1613 if (newpages < oldpages) { 1614 VM_OBJECT_WLOCK(sc->s_swap.object); 1615 vm_object_page_remove(sc->s_swap.object, newpages, 1616 0, 0); 1617 swap_release_by_cred(IDX_TO_OFF(oldpages - 1618 newpages), sc->cred); 1619 sc->s_swap.object->size = newpages; 1620 VM_OBJECT_WUNLOCK(sc->s_swap.object); 1621 } else if (newpages > oldpages) { 1622 res = swap_reserve_by_cred(IDX_TO_OFF(newpages - 1623 oldpages), sc->cred); 1624 if (!res) 1625 return (ENOMEM); 1626 if ((mdr->md_options & MD_RESERVE) || 1627 (sc->flags & MD_RESERVE)) { 1628 error = swap_pager_reserve(sc->s_swap.object, 1629 oldpages, newpages - oldpages); 1630 if (error < 0) { 1631 swap_release_by_cred( 1632 IDX_TO_OFF(newpages - oldpages), 1633 sc->cred); 1634 return (EDOM); 1635 } 1636 } 1637 VM_OBJECT_WLOCK(sc->s_swap.object); 1638 sc->s_swap.object->size = newpages; 1639 VM_OBJECT_WUNLOCK(sc->s_swap.object); 1640 } 1641 break; 1642 default: 1643 return (EOPNOTSUPP); 1644 } 1645 1646 sc->mediasize = mdr->md_mediasize; 1647 1648 g_topology_lock(); 1649 g_resize_provider(sc->pp, sc->mediasize); 1650 g_topology_unlock(); 1651 return (0); 1652 } 1653 1654 static int 1655 mdcreate_swap(struct md_s *sc, struct md_req *mdr, struct thread *td) 1656 { 1657 vm_ooffset_t npage; 1658 int error; 1659 1660 /* 1661 * Range check. Disallow negative sizes and sizes not being 1662 * multiple of page size. 1663 */ 1664 if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0) 1665 return (EDOM); 1666 1667 /* 1668 * Allocate an OBJT_SWAP object. 1669 * 1670 * Note the truncation. 1671 */ 1672 1673 if ((mdr->md_options & MD_VERIFY) != 0) 1674 return (EINVAL); 1675 npage = mdr->md_mediasize / PAGE_SIZE; 1676 if (mdr->md_fwsectors != 0) 1677 sc->fwsectors = mdr->md_fwsectors; 1678 if (mdr->md_fwheads != 0) 1679 sc->fwheads = mdr->md_fwheads; 1680 sc->s_swap.object = vm_pager_allocate(OBJT_SWAP, NULL, 1681 PAGE_SIZE * npage, VM_PROT_DEFAULT, 0, td->td_ucred); 1682 if (sc->s_swap.object == NULL) 1683 return (ENOMEM); 1684 sc->flags = mdr->md_options & (MD_FORCE | MD_RESERVE); 1685 if (mdr->md_options & MD_RESERVE) { 1686 if (swap_pager_reserve(sc->s_swap.object, 0, npage) < 0) { 1687 error = EDOM; 1688 goto finish; 1689 } 1690 } 1691 error = mdsetcred(sc, td->td_ucred); 1692 finish: 1693 if (error != 0) { 1694 vm_object_deallocate(sc->s_swap.object); 1695 sc->s_swap.object = NULL; 1696 } 1697 return (error); 1698 } 1699 1700 static int 1701 mdcreate_null(struct md_s *sc, struct md_req *mdr, struct thread *td) 1702 { 1703 1704 /* 1705 * Range check. Disallow negative sizes and sizes not being 1706 * multiple of page size. 1707 */ 1708 if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0) 1709 return (EDOM); 1710 1711 return (0); 1712 } 1713 1714 static int 1715 kern_mdattach_locked(struct thread *td, struct md_req *mdr) 1716 { 1717 struct md_s *sc; 1718 unsigned sectsize; 1719 int error; 1720 1721 sx_assert(&md_sx, SA_XLOCKED); 1722 1723 switch (mdr->md_type) { 1724 case MD_MALLOC: 1725 case MD_PRELOAD: 1726 case MD_VNODE: 1727 case MD_SWAP: 1728 case MD_NULL: 1729 break; 1730 default: 1731 return (EINVAL); 1732 } 1733 if (mdr->md_sectorsize == 0) 1734 sectsize = DEV_BSIZE; 1735 else 1736 sectsize = mdr->md_sectorsize; 1737 if (sectsize > maxphys || mdr->md_mediasize < sectsize) 1738 return (EINVAL); 1739 if (mdr->md_options & MD_AUTOUNIT) 1740 sc = mdnew(-1, &error, mdr->md_type); 1741 else { 1742 if (mdr->md_unit > INT_MAX) 1743 return (EINVAL); 1744 sc = mdnew(mdr->md_unit, &error, mdr->md_type); 1745 } 1746 if (sc == NULL) 1747 return (error); 1748 if (mdr->md_label != NULL) 1749 error = copyinstr(mdr->md_label, sc->label, 1750 sizeof(sc->label), NULL); 1751 if (error != 0) 1752 goto err_after_new; 1753 if (mdr->md_options & MD_AUTOUNIT) 1754 mdr->md_unit = sc->unit; 1755 sc->mediasize = mdr->md_mediasize; 1756 sc->sectorsize = sectsize; 1757 sc->candelete = true; 1758 error = EDOOFUS; 1759 switch (sc->type) { 1760 case MD_MALLOC: 1761 sc->start = mdstart_malloc; 1762 error = mdcreate_malloc(sc, mdr); 1763 break; 1764 case MD_PRELOAD: 1765 /* 1766 * We disallow attaching preloaded memory disks via 1767 * ioctl. Preloaded memory disks are automatically 1768 * attached in g_md_init(). 1769 */ 1770 error = EOPNOTSUPP; 1771 break; 1772 case MD_VNODE: 1773 sc->start = mdstart_vnode; 1774 error = mdcreate_vnode(sc, mdr, td); 1775 break; 1776 case MD_SWAP: 1777 sc->start = mdstart_swap; 1778 error = mdcreate_swap(sc, mdr, td); 1779 break; 1780 case MD_NULL: 1781 sc->start = mdstart_null; 1782 error = mdcreate_null(sc, mdr, td); 1783 break; 1784 } 1785 err_after_new: 1786 if (error != 0) { 1787 mddestroy(sc, td); 1788 return (error); 1789 } 1790 1791 mdinit(sc); 1792 return (0); 1793 } 1794 1795 static int 1796 kern_mdattach(struct thread *td, struct md_req *mdr) 1797 { 1798 int error; 1799 1800 sx_xlock(&md_sx); 1801 error = kern_mdattach_locked(td, mdr); 1802 sx_xunlock(&md_sx); 1803 return (error); 1804 } 1805 1806 static int 1807 kern_mddetach_locked(struct thread *td, struct md_req *mdr) 1808 { 1809 struct md_s *sc; 1810 1811 sx_assert(&md_sx, SA_XLOCKED); 1812 1813 if (mdr->md_mediasize != 0 || 1814 (mdr->md_options & ~MD_FORCE) != 0) 1815 return (EINVAL); 1816 1817 sc = mdfind(mdr->md_unit); 1818 if (sc == NULL) 1819 return (ENOENT); 1820 if (sc->opencount != 0 && !(sc->flags & MD_FORCE) && 1821 !(mdr->md_options & MD_FORCE)) 1822 return (EBUSY); 1823 return (mddestroy(sc, td)); 1824 } 1825 1826 static int 1827 kern_mddetach(struct thread *td, struct md_req *mdr) 1828 { 1829 int error; 1830 1831 sx_xlock(&md_sx); 1832 error = kern_mddetach_locked(td, mdr); 1833 sx_xunlock(&md_sx); 1834 return (error); 1835 } 1836 1837 static int 1838 kern_mdresize_locked(struct md_req *mdr) 1839 { 1840 struct md_s *sc; 1841 1842 sx_assert(&md_sx, SA_XLOCKED); 1843 1844 if ((mdr->md_options & ~(MD_FORCE | MD_RESERVE)) != 0) 1845 return (EINVAL); 1846 1847 sc = mdfind(mdr->md_unit); 1848 if (sc == NULL) 1849 return (ENOENT); 1850 if (mdr->md_mediasize < sc->sectorsize) 1851 return (EINVAL); 1852 mdr->md_mediasize -= mdr->md_mediasize % sc->sectorsize; 1853 if (mdr->md_mediasize < sc->mediasize && 1854 !(sc->flags & MD_FORCE) && 1855 !(mdr->md_options & MD_FORCE)) 1856 return (EBUSY); 1857 return (mdresize(sc, mdr)); 1858 } 1859 1860 static int 1861 kern_mdresize(struct md_req *mdr) 1862 { 1863 int error; 1864 1865 sx_xlock(&md_sx); 1866 error = kern_mdresize_locked(mdr); 1867 sx_xunlock(&md_sx); 1868 return (error); 1869 } 1870 1871 static int 1872 kern_mdquery_locked(struct md_req *mdr) 1873 { 1874 struct md_s *sc; 1875 int error; 1876 1877 sx_assert(&md_sx, SA_XLOCKED); 1878 1879 sc = mdfind(mdr->md_unit); 1880 if (sc == NULL) 1881 return (ENOENT); 1882 mdr->md_type = sc->type; 1883 mdr->md_options = sc->flags; 1884 mdr->md_mediasize = sc->mediasize; 1885 mdr->md_sectorsize = sc->sectorsize; 1886 error = 0; 1887 if (mdr->md_label != NULL) { 1888 error = copyout(sc->label, mdr->md_label, 1889 strlen(sc->label) + 1); 1890 if (error != 0) 1891 return (error); 1892 } 1893 if (sc->type == MD_VNODE) { 1894 error = copyout(sc->s_vnode.file, mdr->md_file, 1895 strlen(sc->s_vnode.file) + 1); 1896 } else if (sc->type == MD_PRELOAD && mdr->md_file != NULL) { 1897 error = copyout(sc->s_preload.name, mdr->md_file, 1898 strlen(sc->s_preload.name) + 1); 1899 } 1900 return (error); 1901 } 1902 1903 static int 1904 kern_mdquery(struct md_req *mdr) 1905 { 1906 int error; 1907 1908 sx_xlock(&md_sx); 1909 error = kern_mdquery_locked(mdr); 1910 sx_xunlock(&md_sx); 1911 return (error); 1912 } 1913 1914 /* Copy members that are not userspace pointers. */ 1915 #define MD_IOCTL2REQ(mdio, mdr) do { \ 1916 (mdr)->md_unit = (mdio)->md_unit; \ 1917 (mdr)->md_type = (mdio)->md_type; \ 1918 (mdr)->md_mediasize = (mdio)->md_mediasize; \ 1919 (mdr)->md_sectorsize = (mdio)->md_sectorsize; \ 1920 (mdr)->md_options = (mdio)->md_options; \ 1921 (mdr)->md_fwheads = (mdio)->md_fwheads; \ 1922 (mdr)->md_fwsectors = (mdio)->md_fwsectors; \ 1923 (mdr)->md_units = &(mdio)->md_pad[0]; \ 1924 (mdr)->md_units_nitems = nitems((mdio)->md_pad); \ 1925 } while(0) 1926 1927 /* Copy members that might have been updated */ 1928 #define MD_REQ2IOCTL(mdr, mdio) do { \ 1929 (mdio)->md_unit = (mdr)->md_unit; \ 1930 (mdio)->md_type = (mdr)->md_type; \ 1931 (mdio)->md_mediasize = (mdr)->md_mediasize; \ 1932 (mdio)->md_sectorsize = (mdr)->md_sectorsize; \ 1933 (mdio)->md_options = (mdr)->md_options; \ 1934 (mdio)->md_fwheads = (mdr)->md_fwheads; \ 1935 (mdio)->md_fwsectors = (mdr)->md_fwsectors; \ 1936 } while(0) 1937 1938 static int 1939 mdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, 1940 struct thread *td) 1941 { 1942 struct md_req mdr; 1943 int error; 1944 1945 if (md_debug) 1946 printf("mdctlioctl(%s %lx %p %x %p)\n", 1947 devtoname(dev), cmd, addr, flags, td); 1948 1949 bzero(&mdr, sizeof(mdr)); 1950 switch (cmd) { 1951 case MDIOCATTACH: 1952 case MDIOCDETACH: 1953 case MDIOCRESIZE: 1954 case MDIOCQUERY: { 1955 struct md_ioctl *mdio = (struct md_ioctl *)addr; 1956 if (mdio->md_version != MDIOVERSION) 1957 return (EINVAL); 1958 MD_IOCTL2REQ(mdio, &mdr); 1959 mdr.md_file = mdio->md_file; 1960 mdr.md_file_seg = UIO_USERSPACE; 1961 /* If the file is adjacent to the md_ioctl it's in kernel. */ 1962 if ((void *)mdio->md_file == (void *)(mdio + 1)) 1963 mdr.md_file_seg = UIO_SYSSPACE; 1964 mdr.md_label = mdio->md_label; 1965 break; 1966 } 1967 #ifdef COMPAT_FREEBSD32 1968 case MDIOCATTACH_32: 1969 case MDIOCDETACH_32: 1970 case MDIOCRESIZE_32: 1971 case MDIOCQUERY_32: { 1972 struct md_ioctl32 *mdio = (struct md_ioctl32 *)addr; 1973 if (mdio->md_version != MDIOVERSION) 1974 return (EINVAL); 1975 MD_IOCTL2REQ(mdio, &mdr); 1976 mdr.md_file = (void *)(uintptr_t)mdio->md_file; 1977 mdr.md_file_seg = UIO_USERSPACE; 1978 mdr.md_label = (void *)(uintptr_t)mdio->md_label; 1979 break; 1980 } 1981 #endif 1982 default: 1983 /* Fall through to handler switch. */ 1984 break; 1985 } 1986 1987 error = 0; 1988 switch (cmd) { 1989 case MDIOCATTACH: 1990 #ifdef COMPAT_FREEBSD32 1991 case MDIOCATTACH_32: 1992 #endif 1993 error = kern_mdattach(td, &mdr); 1994 break; 1995 case MDIOCDETACH: 1996 #ifdef COMPAT_FREEBSD32 1997 case MDIOCDETACH_32: 1998 #endif 1999 error = kern_mddetach(td, &mdr); 2000 break; 2001 case MDIOCRESIZE: 2002 #ifdef COMPAT_FREEBSD32 2003 case MDIOCRESIZE_32: 2004 #endif 2005 error = kern_mdresize(&mdr); 2006 break; 2007 case MDIOCQUERY: 2008 #ifdef COMPAT_FREEBSD32 2009 case MDIOCQUERY_32: 2010 #endif 2011 error = kern_mdquery(&mdr); 2012 break; 2013 default: 2014 error = ENOIOCTL; 2015 } 2016 2017 switch (cmd) { 2018 case MDIOCATTACH: 2019 case MDIOCQUERY: { 2020 struct md_ioctl *mdio = (struct md_ioctl *)addr; 2021 MD_REQ2IOCTL(&mdr, mdio); 2022 break; 2023 } 2024 #ifdef COMPAT_FREEBSD32 2025 case MDIOCATTACH_32: 2026 case MDIOCQUERY_32: { 2027 struct md_ioctl32 *mdio = (struct md_ioctl32 *)addr; 2028 MD_REQ2IOCTL(&mdr, mdio); 2029 break; 2030 } 2031 #endif 2032 default: 2033 /* Other commands to not alter mdr. */ 2034 break; 2035 } 2036 2037 return (error); 2038 } 2039 2040 static void 2041 md_preloaded(u_char *image, size_t length, const char *name) 2042 { 2043 struct md_s *sc; 2044 int error; 2045 2046 sc = mdnew(-1, &error, MD_PRELOAD); 2047 if (sc == NULL) 2048 return; 2049 sc->mediasize = length; 2050 sc->sectorsize = DEV_BSIZE; 2051 sc->s_preload.pl_ptr = image; 2052 sc->s_preload.pl_len = length; 2053 sc->start = mdstart_preload; 2054 if (name != NULL) 2055 strlcpy(sc->s_preload.name, name, 2056 sizeof(sc->s_preload.name)); 2057 #ifdef MD_ROOT 2058 if (sc->unit == 0) { 2059 #ifndef ROOTDEVNAME 2060 rootdevnames[0] = MD_ROOT_FSTYPE ":/dev/md0"; 2061 #endif 2062 #ifdef MD_ROOT_READONLY 2063 sc->flags |= MD_READONLY; 2064 #endif 2065 } 2066 #endif 2067 mdinit(sc); 2068 if (name != NULL) { 2069 printf("%s%d: Preloaded image <%s> %zd bytes at %p\n", 2070 MD_NAME, sc->unit, name, length, image); 2071 } else { 2072 printf("%s%d: Embedded image %zd bytes at %p\n", 2073 MD_NAME, sc->unit, length, image); 2074 } 2075 } 2076 2077 static void 2078 g_md_init(struct g_class *mp __unused) 2079 { 2080 caddr_t mod; 2081 u_char *ptr, *name, *type; 2082 u_char scratch[40]; 2083 unsigned len; 2084 int i; 2085 vm_offset_t paddr; 2086 2087 /* figure out log2(NINDIR) */ 2088 for (i = NINDIR, nshift = -1; i; nshift++) 2089 i >>= 1; 2090 2091 mod = NULL; 2092 sx_init(&md_sx, "MD config lock"); 2093 g_topology_unlock(); 2094 md_uh = new_unrhdr(0, INT_MAX, NULL); 2095 #ifdef MD_ROOT 2096 if (mfs_root_size != 0) { 2097 sx_xlock(&md_sx); 2098 #ifdef MD_ROOT_MEM 2099 md_preloaded(mfs_root, mfs_root_size, NULL); 2100 #else 2101 md_preloaded(__DEVOLATILE(u_char *, &mfs_root), mfs_root_size, 2102 NULL); 2103 #endif 2104 sx_xunlock(&md_sx); 2105 } 2106 #endif 2107 /* XXX: are preload_* static or do they need Giant ? */ 2108 while ((mod = preload_search_next_name(mod)) != NULL) { 2109 name = (char *)preload_search_info(mod, MODINFO_NAME); 2110 if (name == NULL) 2111 continue; 2112 type = (char *)preload_search_info(mod, MODINFO_TYPE); 2113 if (type == NULL) 2114 continue; 2115 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 2116 continue; 2117 ptr = preload_fetch_addr(mod); 2118 len = preload_fetch_size(mod); 2119 if (ptr != NULL && len != 0) { 2120 sx_xlock(&md_sx); 2121 md_preloaded(ptr, len, name); 2122 sx_xunlock(&md_sx); 2123 } 2124 } 2125 2126 /* 2127 * Load up to 32 pre-loaded disks 2128 */ 2129 for (int i = 0; i < 32; i++) { 2130 if (resource_long_value("md", i, "physaddr", 2131 (long *) &paddr) != 0 || 2132 resource_int_value("md", i, "len", &len) != 0) 2133 break; 2134 ptr = pmap_map(NULL, paddr, paddr + len, VM_PROT_READ); 2135 if (ptr != NULL && len != 0) { 2136 sprintf(scratch, "preload%d 0x%016jx", i, 2137 (uintmax_t)paddr); 2138 sx_xlock(&md_sx); 2139 md_preloaded(ptr, len, scratch); 2140 sx_xunlock(&md_sx); 2141 } 2142 } 2143 2144 status_dev = make_dev(&mdctl_cdevsw, INT_MAX, UID_ROOT, GID_WHEEL, 2145 0600, MDCTL_NAME); 2146 g_topology_lock(); 2147 } 2148 2149 static void 2150 g_md_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 2151 struct g_consumer *cp __unused, struct g_provider *pp) 2152 { 2153 struct md_s *mp; 2154 char *type; 2155 2156 mp = gp->softc; 2157 if (mp == NULL) 2158 return; 2159 2160 switch (mp->type) { 2161 case MD_MALLOC: 2162 type = "malloc"; 2163 break; 2164 case MD_PRELOAD: 2165 type = "preload"; 2166 break; 2167 case MD_VNODE: 2168 type = "vnode"; 2169 break; 2170 case MD_SWAP: 2171 type = "swap"; 2172 break; 2173 case MD_NULL: 2174 type = "null"; 2175 break; 2176 default: 2177 type = "unknown"; 2178 break; 2179 } 2180 2181 if (pp != NULL) { 2182 if (indent == NULL) { 2183 sbuf_printf(sb, " u %d", mp->unit); 2184 sbuf_printf(sb, " s %ju", (uintmax_t) mp->sectorsize); 2185 sbuf_printf(sb, " f %ju", (uintmax_t) mp->fwheads); 2186 sbuf_printf(sb, " fs %ju", (uintmax_t) mp->fwsectors); 2187 sbuf_printf(sb, " l %ju", (uintmax_t) mp->mediasize); 2188 sbuf_printf(sb, " t %s", type); 2189 if (mp->type == MD_VNODE && 2190 mp->s_vnode.vnode != NULL) 2191 sbuf_printf(sb, " file %s", mp->s_vnode.file); 2192 if (mp->type == MD_PRELOAD && 2193 mp->s_preload.name[0] != '\0') { 2194 sbuf_printf(sb, " file %s", 2195 mp->s_preload.name); 2196 } 2197 sbuf_printf(sb, " label %s", mp->label); 2198 } else { 2199 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent, 2200 mp->unit); 2201 sbuf_printf(sb, "%s<sectorsize>%ju</sectorsize>\n", 2202 indent, (uintmax_t) mp->sectorsize); 2203 sbuf_printf(sb, "%s<fwheads>%ju</fwheads>\n", 2204 indent, (uintmax_t) mp->fwheads); 2205 sbuf_printf(sb, "%s<fwsectors>%ju</fwsectors>\n", 2206 indent, (uintmax_t) mp->fwsectors); 2207 if (mp->ident[0] != '\0') { 2208 sbuf_printf(sb, "%s<ident>", indent); 2209 g_conf_printf_escaped(sb, "%s", mp->ident); 2210 sbuf_printf(sb, "</ident>\n"); 2211 } 2212 sbuf_printf(sb, "%s<length>%ju</length>\n", 2213 indent, (uintmax_t) mp->mediasize); 2214 sbuf_printf(sb, "%s<compression>%s</compression>\n", indent, 2215 (mp->flags & MD_COMPRESS) == 0 ? "off": "on"); 2216 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 2217 (mp->flags & MD_READONLY) == 0 ? "read-write": 2218 "read-only"); 2219 sbuf_printf(sb, "%s<type>%s</type>\n", indent, 2220 type); 2221 if (mp->type == MD_VNODE) { 2222 if (mp->s_vnode.vnode != NULL) { 2223 sbuf_printf(sb, "%s<file>", indent); 2224 g_conf_printf_escaped(sb, "%s", 2225 mp->s_vnode.file); 2226 sbuf_printf(sb, "</file>\n"); 2227 } 2228 sbuf_printf(sb, "%s<cache>%s</cache>\n", indent, 2229 (mp->flags & MD_CACHE) == 0 ? "off": "on"); 2230 } 2231 if (mp->type == MD_PRELOAD && 2232 mp->s_preload.name[0] != '\0') { 2233 sbuf_printf(sb, "%s<file>", indent); 2234 g_conf_printf_escaped(sb, "%s", 2235 mp->s_preload.name); 2236 sbuf_printf(sb, "</file>\n"); 2237 } 2238 sbuf_printf(sb, "%s<label>", indent); 2239 g_conf_printf_escaped(sb, "%s", mp->label); 2240 sbuf_printf(sb, "</label>\n"); 2241 } 2242 } 2243 } 2244 2245 static void 2246 g_md_fini(struct g_class *mp __unused) 2247 { 2248 2249 sx_destroy(&md_sx); 2250 if (status_dev != NULL) 2251 destroy_dev(status_dev); 2252 delete_unrhdr(md_uh); 2253 } 2254