1 /*- 2 * SPDX-License-Identifier: (Beerware AND BSD-3-Clause) 3 * 4 * ---------------------------------------------------------------------------- 5 * "THE BEER-WARE LICENSE" (Revision 42): 6 * <[email protected]> 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 vn(4) driver: mdstart_swap(), 15 * mdstart_vnode(), mdcreate_swap(), mdcreate_vnode() and mddestroy(), 16 * 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 * 57 * from: @(#)vn.c 8.6 (Berkeley) 4/1/94 58 * From: src/sys/dev/vn/vn.c,v 1.122 2000/12/16 16:06:03 59 */ 60 61 #include "opt_rootdevname.h" 62 #include "opt_geom.h" 63 #include "opt_md.h" 64 65 #include <sys/param.h> 66 #include <sys/systm.h> 67 #include <sys/bio.h> 68 #include <sys/buf.h> 69 #include <sys/conf.h> 70 #include <sys/devicestat.h> 71 #include <sys/fcntl.h> 72 #include <sys/kernel.h> 73 #include <sys/kthread.h> 74 #include <sys/limits.h> 75 #include <sys/linker.h> 76 #include <sys/lock.h> 77 #include <sys/malloc.h> 78 #include <sys/mdioctl.h> 79 #include <sys/mount.h> 80 #include <sys/mutex.h> 81 #include <sys/sx.h> 82 #include <sys/namei.h> 83 #include <sys/proc.h> 84 #include <sys/queue.h> 85 #include <sys/rwlock.h> 86 #include <sys/sbuf.h> 87 #include <sys/sched.h> 88 #include <sys/sf_buf.h> 89 #include <sys/sysctl.h> 90 #include <sys/uio.h> 91 #include <sys/unistd.h> 92 #include <sys/vnode.h> 93 #include <sys/disk.h> 94 95 #include <geom/geom.h> 96 #include <geom/geom_int.h> 97 98 #include <vm/vm.h> 99 #include <vm/vm_extern.h> 100 #include <vm/vm_param.h> 101 #include <vm/vm_object.h> 102 #include <vm/vm_page.h> 103 #include <vm/vm_pager.h> 104 #include <vm/swap_pager.h> 105 #include <vm/uma.h> 106 107 #include <machine/bus.h> 108 109 #define MD_MODVER 1 110 111 #define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */ 112 #define MD_EXITING 0x20000 /* Worker thread is exiting. */ 113 #define MD_PROVIDERGONE 0x40000 /* Safe to free the softc */ 114 115 #ifndef MD_NSECT 116 #define MD_NSECT (10000 * 2) 117 #endif 118 119 struct md_req { 120 unsigned md_unit; /* unit number */ 121 enum md_types md_type; /* type of disk */ 122 off_t md_mediasize; /* size of disk in bytes */ 123 unsigned md_sectorsize; /* sectorsize */ 124 unsigned md_options; /* options */ 125 int md_fwheads; /* firmware heads */ 126 int md_fwsectors; /* firmware sectors */ 127 char *md_file; /* pathname of file to mount */ 128 enum uio_seg md_file_seg; /* location of md_file */ 129 char *md_label; /* label of the device (userspace) */ 130 int *md_units; /* pointer to units array (kernel) */ 131 size_t md_units_nitems; /* items in md_units array */ 132 }; 133 134 #ifdef COMPAT_FREEBSD32 135 struct md_ioctl32 { 136 unsigned md_version; 137 unsigned md_unit; 138 enum md_types md_type; 139 uint32_t md_file; 140 off_t md_mediasize; 141 unsigned md_sectorsize; 142 unsigned md_options; 143 uint64_t md_base; 144 int md_fwheads; 145 int md_fwsectors; 146 uint32_t md_label; 147 int md_pad[MDNPAD]; 148 } 149 #ifdef __amd64__ 150 __attribute__((__packed__)) 151 #endif 152 ; 153 #ifndef __amd64__ 154 CTASSERT((sizeof(struct md_ioctl32)) == 440); 155 #else 156 CTASSERT((sizeof(struct md_ioctl32)) == 436); 157 #endif 158 159 #define MDIOCATTACH_32 _IOC_NEWTYPE(MDIOCATTACH, struct md_ioctl32) 160 #define MDIOCDETACH_32 _IOC_NEWTYPE(MDIOCDETACH, struct md_ioctl32) 161 #define MDIOCQUERY_32 _IOC_NEWTYPE(MDIOCQUERY, struct md_ioctl32) 162 #define MDIOCRESIZE_32 _IOC_NEWTYPE(MDIOCRESIZE, struct md_ioctl32) 163 #endif /* COMPAT_FREEBSD32 */ 164 165 static MALLOC_DEFINE(M_MD, "md_disk", "Memory Disk"); 166 static MALLOC_DEFINE(M_MDSECT, "md_sectors", "Memory Disk Sectors"); 167 168 static int md_debug; 169 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, 170 "Enable md(4) debug messages"); 171 static int md_malloc_wait; 172 SYSCTL_INT(_vm, OID_AUTO, md_malloc_wait, CTLFLAG_RW, &md_malloc_wait, 0, 173 "Allow malloc to wait for memory allocations"); 174 175 #if defined(MD_ROOT) && !defined(MD_ROOT_FSTYPE) 176 #define MD_ROOT_FSTYPE "ufs" 177 #endif 178 179 #if defined(MD_ROOT) 180 /* 181 * Preloaded image gets put here. 182 */ 183 #if defined(MD_ROOT_SIZE) 184 /* 185 * We put the mfs_root symbol into the oldmfs section of the kernel object file. 186 * Applications that patch the object with the image can determine 187 * the size looking at the oldmfs section size within the kernel. 188 */ 189 u_char mfs_root[MD_ROOT_SIZE*1024] __attribute__ ((section ("oldmfs"))); 190 const int mfs_root_size = sizeof(mfs_root); 191 #elif defined(MD_ROOT_MEM) 192 /* MD region already mapped in the memory */ 193 u_char *mfs_root; 194 int mfs_root_size; 195 #else 196 extern volatile u_char __weak_symbol mfs_root; 197 extern volatile u_char __weak_symbol mfs_root_end; 198 #define mfs_root_size ((uintptr_t)(&mfs_root_end - &mfs_root)) 199 #endif 200 #endif 201 202 static g_init_t g_md_init; 203 static g_fini_t g_md_fini; 204 static g_start_t g_md_start; 205 static g_access_t g_md_access; 206 static void g_md_dumpconf(struct sbuf *sb, const char *indent, 207 struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp); 208 static g_provgone_t g_md_providergone; 209 210 static struct cdev *status_dev = NULL; 211 static struct sx md_sx; 212 static struct unrhdr *md_uh; 213 214 static d_ioctl_t mdctlioctl; 215 216 static struct cdevsw mdctl_cdevsw = { 217 .d_version = D_VERSION, 218 .d_ioctl = mdctlioctl, 219 .d_name = MD_NAME, 220 }; 221 222 struct g_class g_md_class = { 223 .name = "MD", 224 .version = G_VERSION, 225 .init = g_md_init, 226 .fini = g_md_fini, 227 .start = g_md_start, 228 .access = g_md_access, 229 .dumpconf = g_md_dumpconf, 230 .providergone = g_md_providergone, 231 }; 232 233 DECLARE_GEOM_CLASS(g_md_class, g_md); 234 MODULE_VERSION(geom_md, 0); 235 236 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(md_softc_list); 237 238 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 239 #define NMASK (NINDIR-1) 240 static int nshift; 241 242 struct indir { 243 uintptr_t *array; 244 u_int total; 245 u_int used; 246 u_int shift; 247 }; 248 249 struct md_s { 250 int unit; 251 LIST_ENTRY(md_s) list; 252 struct bio_queue_head bio_queue; 253 struct mtx queue_mtx; 254 struct cdev *dev; 255 enum md_types type; 256 off_t mediasize; 257 unsigned sectorsize; 258 unsigned opencount; 259 unsigned fwheads; 260 unsigned fwsectors; 261 char ident[32]; 262 unsigned flags; 263 char name[20]; 264 struct proc *procp; 265 struct g_geom *gp; 266 struct g_provider *pp; 267 int (*start)(struct md_s *sc, struct bio *bp); 268 struct devstat *devstat; 269 bool candelete; 270 271 /* MD_MALLOC related fields */ 272 struct indir *indir; 273 uma_zone_t uma; 274 275 /* MD_PRELOAD related fields */ 276 u_char *pl_ptr; 277 size_t pl_len; 278 279 /* MD_VNODE related fields */ 280 struct vnode *vnode; 281 char file[PATH_MAX]; 282 char label[PATH_MAX]; 283 struct ucred *cred; 284 vm_offset_t kva; 285 286 /* MD_SWAP related fields */ 287 vm_object_t object; 288 }; 289 290 static struct indir * 291 new_indir(u_int shift) 292 { 293 struct indir *ip; 294 295 ip = malloc(sizeof *ip, M_MD, (md_malloc_wait ? M_WAITOK : M_NOWAIT) 296 | M_ZERO); 297 if (ip == NULL) 298 return (NULL); 299 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 300 M_MDSECT, (md_malloc_wait ? M_WAITOK : M_NOWAIT) | M_ZERO); 301 if (ip->array == NULL) { 302 free(ip, M_MD); 303 return (NULL); 304 } 305 ip->total = NINDIR; 306 ip->shift = shift; 307 return (ip); 308 } 309 310 static void 311 del_indir(struct indir *ip) 312 { 313 314 free(ip->array, M_MDSECT); 315 free(ip, M_MD); 316 } 317 318 static void 319 destroy_indir(struct md_s *sc, struct indir *ip) 320 { 321 int i; 322 323 for (i = 0; i < NINDIR; i++) { 324 if (!ip->array[i]) 325 continue; 326 if (ip->shift) 327 destroy_indir(sc, (struct indir*)(ip->array[i])); 328 else if (ip->array[i] > 255) 329 uma_zfree(sc->uma, (void *)(ip->array[i])); 330 } 331 del_indir(ip); 332 } 333 334 /* 335 * This function does the math and allocates the top level "indir" structure 336 * for a device of "size" sectors. 337 */ 338 339 static struct indir * 340 dimension(off_t size) 341 { 342 off_t rcnt; 343 struct indir *ip; 344 int layer; 345 346 rcnt = size; 347 layer = 0; 348 while (rcnt > NINDIR) { 349 rcnt /= NINDIR; 350 layer++; 351 } 352 353 /* 354 * XXX: the top layer is probably not fully populated, so we allocate 355 * too much space for ip->array in here. 356 */ 357 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO); 358 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 359 M_MDSECT, M_WAITOK | M_ZERO); 360 ip->total = NINDIR; 361 ip->shift = layer * nshift; 362 return (ip); 363 } 364 365 /* 366 * Read a given sector 367 */ 368 369 static uintptr_t 370 s_read(struct indir *ip, off_t offset) 371 { 372 struct indir *cip; 373 int idx; 374 uintptr_t up; 375 376 if (md_debug > 1) 377 printf("s_read(%jd)\n", (intmax_t)offset); 378 up = 0; 379 for (cip = ip; cip != NULL;) { 380 if (cip->shift) { 381 idx = (offset >> cip->shift) & NMASK; 382 up = cip->array[idx]; 383 cip = (struct indir *)up; 384 continue; 385 } 386 idx = offset & NMASK; 387 return (cip->array[idx]); 388 } 389 return (0); 390 } 391 392 /* 393 * Write a given sector, prune the tree if the value is 0 394 */ 395 396 static int 397 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 398 { 399 struct indir *cip, *lip[10]; 400 int idx, li; 401 uintptr_t up; 402 403 if (md_debug > 1) 404 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 405 up = 0; 406 li = 0; 407 cip = ip; 408 for (;;) { 409 lip[li++] = cip; 410 if (cip->shift) { 411 idx = (offset >> cip->shift) & NMASK; 412 up = cip->array[idx]; 413 if (up != 0) { 414 cip = (struct indir *)up; 415 continue; 416 } 417 /* Allocate branch */ 418 cip->array[idx] = 419 (uintptr_t)new_indir(cip->shift - nshift); 420 if (cip->array[idx] == 0) 421 return (ENOSPC); 422 cip->used++; 423 up = cip->array[idx]; 424 cip = (struct indir *)up; 425 continue; 426 } 427 /* leafnode */ 428 idx = offset & NMASK; 429 up = cip->array[idx]; 430 if (up != 0) 431 cip->used--; 432 cip->array[idx] = ptr; 433 if (ptr != 0) 434 cip->used++; 435 break; 436 } 437 if (cip->used != 0 || li == 1) 438 return (0); 439 li--; 440 while (cip->used == 0 && cip != ip) { 441 li--; 442 idx = (offset >> lip[li]->shift) & NMASK; 443 up = lip[li]->array[idx]; 444 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 445 del_indir(cip); 446 lip[li]->array[idx] = 0; 447 lip[li]->used--; 448 cip = lip[li]; 449 } 450 return (0); 451 } 452 453 static int 454 g_md_access(struct g_provider *pp, int r, int w, int e) 455 { 456 struct md_s *sc; 457 458 sc = pp->geom->softc; 459 if (sc == NULL) { 460 if (r <= 0 && w <= 0 && e <= 0) 461 return (0); 462 return (ENXIO); 463 } 464 r += pp->acr; 465 w += pp->acw; 466 e += pp->ace; 467 if ((sc->flags & MD_READONLY) != 0 && w > 0) 468 return (EROFS); 469 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 470 sc->opencount = 1; 471 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 472 sc->opencount = 0; 473 } 474 return (0); 475 } 476 477 static void 478 g_md_start(struct bio *bp) 479 { 480 struct md_s *sc; 481 482 sc = bp->bio_to->geom->softc; 483 if ((bp->bio_cmd == BIO_READ) || (bp->bio_cmd == BIO_WRITE)) { 484 devstat_start_transaction_bio(sc->devstat, bp); 485 } 486 mtx_lock(&sc->queue_mtx); 487 bioq_disksort(&sc->bio_queue, bp); 488 wakeup(sc); 489 mtx_unlock(&sc->queue_mtx); 490 } 491 492 #define MD_MALLOC_MOVE_ZERO 1 493 #define MD_MALLOC_MOVE_FILL 2 494 #define MD_MALLOC_MOVE_READ 3 495 #define MD_MALLOC_MOVE_WRITE 4 496 #define MD_MALLOC_MOVE_CMP 5 497 498 static int 499 md_malloc_move_ma(vm_page_t **mp, int *ma_offs, unsigned sectorsize, 500 void *ptr, u_char fill, int op) 501 { 502 struct sf_buf *sf; 503 vm_page_t m, *mp1; 504 char *p, first; 505 off_t *uc; 506 unsigned n; 507 int error, i, ma_offs1, sz, first_read; 508 509 m = NULL; 510 error = 0; 511 sf = NULL; 512 /* if (op == MD_MALLOC_MOVE_CMP) { gcc */ 513 first = 0; 514 first_read = 0; 515 uc = ptr; 516 mp1 = *mp; 517 ma_offs1 = *ma_offs; 518 /* } */ 519 sched_pin(); 520 for (n = sectorsize; n != 0; n -= sz) { 521 sz = imin(PAGE_SIZE - *ma_offs, n); 522 if (m != **mp) { 523 if (sf != NULL) 524 sf_buf_free(sf); 525 m = **mp; 526 sf = sf_buf_alloc(m, SFB_CPUPRIVATE | 527 (md_malloc_wait ? 0 : SFB_NOWAIT)); 528 if (sf == NULL) { 529 error = ENOMEM; 530 break; 531 } 532 } 533 p = (char *)sf_buf_kva(sf) + *ma_offs; 534 switch (op) { 535 case MD_MALLOC_MOVE_ZERO: 536 bzero(p, sz); 537 break; 538 case MD_MALLOC_MOVE_FILL: 539 memset(p, fill, sz); 540 break; 541 case MD_MALLOC_MOVE_READ: 542 bcopy(ptr, p, sz); 543 cpu_flush_dcache(p, sz); 544 break; 545 case MD_MALLOC_MOVE_WRITE: 546 bcopy(p, ptr, sz); 547 break; 548 case MD_MALLOC_MOVE_CMP: 549 for (i = 0; i < sz; i++, p++) { 550 if (!first_read) { 551 *uc = (u_char)*p; 552 first = *p; 553 first_read = 1; 554 } else if (*p != first) { 555 error = EDOOFUS; 556 break; 557 } 558 } 559 break; 560 default: 561 KASSERT(0, ("md_malloc_move_ma unknown op %d\n", op)); 562 break; 563 } 564 if (error != 0) 565 break; 566 *ma_offs += sz; 567 *ma_offs %= PAGE_SIZE; 568 if (*ma_offs == 0) 569 (*mp)++; 570 ptr = (char *)ptr + sz; 571 } 572 573 if (sf != NULL) 574 sf_buf_free(sf); 575 sched_unpin(); 576 if (op == MD_MALLOC_MOVE_CMP && error != 0) { 577 *mp = mp1; 578 *ma_offs = ma_offs1; 579 } 580 return (error); 581 } 582 583 static int 584 md_malloc_move_vlist(bus_dma_segment_t **pvlist, int *pma_offs, 585 unsigned len, void *ptr, u_char fill, int op) 586 { 587 bus_dma_segment_t *vlist; 588 uint8_t *p, *end, first; 589 off_t *uc; 590 int ma_offs, seg_len; 591 592 vlist = *pvlist; 593 ma_offs = *pma_offs; 594 uc = ptr; 595 596 for (; len != 0; len -= seg_len) { 597 seg_len = imin(vlist->ds_len - ma_offs, len); 598 p = (uint8_t *)(uintptr_t)vlist->ds_addr + ma_offs; 599 switch (op) { 600 case MD_MALLOC_MOVE_ZERO: 601 bzero(p, seg_len); 602 break; 603 case MD_MALLOC_MOVE_FILL: 604 memset(p, fill, seg_len); 605 break; 606 case MD_MALLOC_MOVE_READ: 607 bcopy(ptr, p, seg_len); 608 cpu_flush_dcache(p, seg_len); 609 break; 610 case MD_MALLOC_MOVE_WRITE: 611 bcopy(p, ptr, seg_len); 612 break; 613 case MD_MALLOC_MOVE_CMP: 614 end = p + seg_len; 615 first = *uc = *p; 616 /* Confirm all following bytes match the first */ 617 while (++p < end) { 618 if (*p != first) 619 return (EDOOFUS); 620 } 621 break; 622 default: 623 KASSERT(0, ("md_malloc_move_vlist unknown op %d\n", op)); 624 break; 625 } 626 627 ma_offs += seg_len; 628 if (ma_offs == vlist->ds_len) { 629 ma_offs = 0; 630 vlist++; 631 } 632 ptr = (uint8_t *)ptr + seg_len; 633 } 634 *pvlist = vlist; 635 *pma_offs = ma_offs; 636 637 return (0); 638 } 639 640 static int 641 mdstart_malloc(struct md_s *sc, struct bio *bp) 642 { 643 u_char *dst; 644 vm_page_t *m; 645 bus_dma_segment_t *vlist; 646 int i, error, error1, ma_offs, notmapped; 647 off_t secno, nsec, uc; 648 uintptr_t sp, osp; 649 650 switch (bp->bio_cmd) { 651 case BIO_READ: 652 case BIO_WRITE: 653 case BIO_DELETE: 654 break; 655 case BIO_FLUSH: 656 return (0); 657 default: 658 return (EOPNOTSUPP); 659 } 660 661 notmapped = (bp->bio_flags & BIO_UNMAPPED) != 0; 662 vlist = (bp->bio_flags & BIO_VLIST) != 0 ? 663 (bus_dma_segment_t *)bp->bio_data : NULL; 664 if (notmapped) { 665 m = bp->bio_ma; 666 ma_offs = bp->bio_ma_offset; 667 dst = NULL; 668 KASSERT(vlist == NULL, ("vlists cannot be unmapped")); 669 } else if (vlist != NULL) { 670 ma_offs = bp->bio_ma_offset; 671 dst = NULL; 672 } else { 673 dst = bp->bio_data; 674 } 675 676 nsec = bp->bio_length / sc->sectorsize; 677 secno = bp->bio_offset / sc->sectorsize; 678 error = 0; 679 while (nsec--) { 680 osp = s_read(sc->indir, secno); 681 if (bp->bio_cmd == BIO_DELETE) { 682 if (osp != 0) 683 error = s_write(sc->indir, secno, 0); 684 } else if (bp->bio_cmd == BIO_READ) { 685 if (osp == 0) { 686 if (notmapped) { 687 error = md_malloc_move_ma(&m, &ma_offs, 688 sc->sectorsize, NULL, 0, 689 MD_MALLOC_MOVE_ZERO); 690 } else if (vlist != NULL) { 691 error = md_malloc_move_vlist(&vlist, 692 &ma_offs, sc->sectorsize, NULL, 0, 693 MD_MALLOC_MOVE_ZERO); 694 } else 695 bzero(dst, sc->sectorsize); 696 } else if (osp <= 255) { 697 if (notmapped) { 698 error = md_malloc_move_ma(&m, &ma_offs, 699 sc->sectorsize, NULL, osp, 700 MD_MALLOC_MOVE_FILL); 701 } else if (vlist != NULL) { 702 error = md_malloc_move_vlist(&vlist, 703 &ma_offs, sc->sectorsize, NULL, osp, 704 MD_MALLOC_MOVE_FILL); 705 } else 706 memset(dst, osp, sc->sectorsize); 707 } else { 708 if (notmapped) { 709 error = md_malloc_move_ma(&m, &ma_offs, 710 sc->sectorsize, (void *)osp, 0, 711 MD_MALLOC_MOVE_READ); 712 } else if (vlist != NULL) { 713 error = md_malloc_move_vlist(&vlist, 714 &ma_offs, sc->sectorsize, 715 (void *)osp, 0, 716 MD_MALLOC_MOVE_READ); 717 } else { 718 bcopy((void *)osp, dst, sc->sectorsize); 719 cpu_flush_dcache(dst, sc->sectorsize); 720 } 721 } 722 osp = 0; 723 } else if (bp->bio_cmd == BIO_WRITE) { 724 if (sc->flags & MD_COMPRESS) { 725 if (notmapped) { 726 error1 = md_malloc_move_ma(&m, &ma_offs, 727 sc->sectorsize, &uc, 0, 728 MD_MALLOC_MOVE_CMP); 729 i = error1 == 0 ? sc->sectorsize : 0; 730 } else if (vlist != NULL) { 731 error1 = md_malloc_move_vlist(&vlist, 732 &ma_offs, sc->sectorsize, &uc, 0, 733 MD_MALLOC_MOVE_CMP); 734 i = error1 == 0 ? sc->sectorsize : 0; 735 } else { 736 uc = dst[0]; 737 for (i = 1; i < sc->sectorsize; i++) { 738 if (dst[i] != uc) 739 break; 740 } 741 } 742 } else { 743 i = 0; 744 uc = 0; 745 } 746 if (i == sc->sectorsize) { 747 if (osp != uc) 748 error = s_write(sc->indir, secno, uc); 749 } else { 750 if (osp <= 255) { 751 sp = (uintptr_t)uma_zalloc(sc->uma, 752 md_malloc_wait ? M_WAITOK : 753 M_NOWAIT); 754 if (sp == 0) { 755 error = ENOSPC; 756 break; 757 } 758 if (notmapped) { 759 error = md_malloc_move_ma(&m, 760 &ma_offs, sc->sectorsize, 761 (void *)sp, 0, 762 MD_MALLOC_MOVE_WRITE); 763 } else if (vlist != NULL) { 764 error = md_malloc_move_vlist( 765 &vlist, &ma_offs, 766 sc->sectorsize, (void *)sp, 767 0, MD_MALLOC_MOVE_WRITE); 768 } else { 769 bcopy(dst, (void *)sp, 770 sc->sectorsize); 771 } 772 error = s_write(sc->indir, secno, sp); 773 } else { 774 if (notmapped) { 775 error = md_malloc_move_ma(&m, 776 &ma_offs, sc->sectorsize, 777 (void *)osp, 0, 778 MD_MALLOC_MOVE_WRITE); 779 } else if (vlist != NULL) { 780 error = md_malloc_move_vlist( 781 &vlist, &ma_offs, 782 sc->sectorsize, (void *)osp, 783 0, MD_MALLOC_MOVE_WRITE); 784 } else { 785 bcopy(dst, (void *)osp, 786 sc->sectorsize); 787 } 788 osp = 0; 789 } 790 } 791 } else { 792 error = EOPNOTSUPP; 793 } 794 if (osp > 255) 795 uma_zfree(sc->uma, (void*)osp); 796 if (error != 0) 797 break; 798 secno++; 799 if (!notmapped && vlist == NULL) 800 dst += sc->sectorsize; 801 } 802 bp->bio_resid = 0; 803 return (error); 804 } 805 806 static void 807 mdcopyto_vlist(void *src, bus_dma_segment_t *vlist, off_t offset, off_t len) 808 { 809 off_t seg_len; 810 811 while (offset >= vlist->ds_len) { 812 offset -= vlist->ds_len; 813 vlist++; 814 } 815 816 while (len != 0) { 817 seg_len = omin(len, vlist->ds_len - offset); 818 bcopy(src, (void *)(uintptr_t)(vlist->ds_addr + offset), 819 seg_len); 820 offset = 0; 821 src = (uint8_t *)src + seg_len; 822 len -= seg_len; 823 vlist++; 824 } 825 } 826 827 static void 828 mdcopyfrom_vlist(bus_dma_segment_t *vlist, off_t offset, void *dst, off_t len) 829 { 830 off_t seg_len; 831 832 while (offset >= vlist->ds_len) { 833 offset -= vlist->ds_len; 834 vlist++; 835 } 836 837 while (len != 0) { 838 seg_len = omin(len, vlist->ds_len - offset); 839 bcopy((void *)(uintptr_t)(vlist->ds_addr + offset), dst, 840 seg_len); 841 offset = 0; 842 dst = (uint8_t *)dst + seg_len; 843 len -= seg_len; 844 vlist++; 845 } 846 } 847 848 static int 849 mdstart_preload(struct md_s *sc, struct bio *bp) 850 { 851 uint8_t *p; 852 853 p = sc->pl_ptr + bp->bio_offset; 854 switch (bp->bio_cmd) { 855 case BIO_READ: 856 if ((bp->bio_flags & BIO_VLIST) != 0) { 857 mdcopyto_vlist(p, (bus_dma_segment_t *)bp->bio_data, 858 bp->bio_ma_offset, bp->bio_length); 859 } else { 860 bcopy(p, bp->bio_data, bp->bio_length); 861 } 862 cpu_flush_dcache(bp->bio_data, bp->bio_length); 863 break; 864 case BIO_WRITE: 865 if ((bp->bio_flags & BIO_VLIST) != 0) { 866 mdcopyfrom_vlist((bus_dma_segment_t *)bp->bio_data, 867 bp->bio_ma_offset, p, bp->bio_length); 868 } else { 869 bcopy(bp->bio_data, p, bp->bio_length); 870 } 871 break; 872 } 873 bp->bio_resid = 0; 874 return (0); 875 } 876 877 static int 878 mdstart_vnode(struct md_s *sc, struct bio *bp) 879 { 880 int error; 881 struct uio auio; 882 struct iovec aiov; 883 struct iovec *piov; 884 struct mount *mp; 885 struct vnode *vp; 886 bus_dma_segment_t *vlist; 887 struct thread *td; 888 off_t iolen, iostart, off, len; 889 int ma_offs, npages; 890 bool mapped; 891 892 switch (bp->bio_cmd) { 893 case BIO_READ: 894 auio.uio_rw = UIO_READ; 895 break; 896 case BIO_WRITE: 897 auio.uio_rw = UIO_WRITE; 898 break; 899 case BIO_FLUSH: 900 break; 901 case BIO_DELETE: 902 if (sc->candelete) 903 break; 904 /* FALLTHROUGH */ 905 default: 906 return (EOPNOTSUPP); 907 } 908 909 td = curthread; 910 vp = sc->vnode; 911 piov = NULL; 912 ma_offs = bp->bio_ma_offset; 913 off = bp->bio_offset; 914 len = bp->bio_length; 915 mapped = false; 916 917 /* 918 * VNODE I/O 919 * 920 * If an error occurs, we set BIO_ERROR but we do not set 921 * B_INVAL because (for a write anyway), the buffer is 922 * still valid. 923 */ 924 925 if (bp->bio_cmd == BIO_FLUSH) { 926 do { 927 (void)vn_start_write(vp, &mp, V_WAIT); 928 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 929 error = VOP_FSYNC(vp, MNT_WAIT, td); 930 VOP_UNLOCK(vp); 931 vn_finished_write(mp); 932 } while (error == ERELOOKUP); 933 return (error); 934 } else if (bp->bio_cmd == BIO_DELETE) { 935 error = vn_deallocate(vp, &off, &len, 0, 936 sc->flags & MD_ASYNC ? 0 : IO_SYNC, sc->cred, NOCRED); 937 bp->bio_resid = len; 938 return (error); 939 } 940 941 auio.uio_offset = (vm_ooffset_t)bp->bio_offset; 942 auio.uio_resid = bp->bio_length; 943 auio.uio_segflg = UIO_SYSSPACE; 944 auio.uio_td = td; 945 946 if ((bp->bio_flags & BIO_VLIST) != 0) { 947 piov = malloc(sizeof(*piov) * bp->bio_ma_n, M_MD, M_WAITOK); 948 auio.uio_iov = piov; 949 vlist = (bus_dma_segment_t *)bp->bio_data; 950 while (len > 0) { 951 piov->iov_base = (void *)(uintptr_t)(vlist->ds_addr + 952 ma_offs); 953 piov->iov_len = vlist->ds_len - ma_offs; 954 if (piov->iov_len > len) 955 piov->iov_len = len; 956 len -= piov->iov_len; 957 ma_offs = 0; 958 vlist++; 959 piov++; 960 } 961 auio.uio_iovcnt = piov - auio.uio_iov; 962 piov = auio.uio_iov; 963 } else if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 964 bp->bio_resid = len; 965 unmapped_step: 966 npages = atop(min(maxphys, round_page(len + (ma_offs & 967 PAGE_MASK)))); 968 iolen = min(ptoa(npages) - (ma_offs & PAGE_MASK), len); 969 KASSERT(iolen > 0, ("zero iolen")); 970 KASSERT(npages <= atop(MAXPHYS + PAGE_SIZE), 971 ("npages %d too large", npages)); 972 pmap_qenter(sc->kva, &bp->bio_ma[atop(ma_offs)], npages); 973 aiov.iov_base = (void *)(sc->kva + (ma_offs & PAGE_MASK)); 974 aiov.iov_len = iolen; 975 auio.uio_iov = &aiov; 976 auio.uio_iovcnt = 1; 977 auio.uio_resid = iolen; 978 mapped = true; 979 } else { 980 aiov.iov_base = bp->bio_data; 981 aiov.iov_len = bp->bio_length; 982 auio.uio_iov = &aiov; 983 auio.uio_iovcnt = 1; 984 } 985 iostart = auio.uio_offset; 986 if (auio.uio_rw == UIO_READ) { 987 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 988 error = VOP_READ(vp, &auio, 0, sc->cred); 989 VOP_UNLOCK(vp); 990 } else { 991 (void) vn_start_write(vp, &mp, V_WAIT); 992 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 993 error = VOP_WRITE(vp, &auio, sc->flags & MD_ASYNC ? 0 : IO_SYNC, 994 sc->cred); 995 VOP_UNLOCK(vp); 996 vn_finished_write(mp); 997 if (error == 0) 998 sc->flags &= ~MD_VERIFY; 999 } 1000 1001 /* When MD_CACHE is set, try to avoid double-caching the data. */ 1002 if (error == 0 && (sc->flags & MD_CACHE) == 0) 1003 VOP_ADVISE(vp, iostart, auio.uio_offset - 1, 1004 POSIX_FADV_DONTNEED); 1005 1006 if (mapped) { 1007 pmap_qremove(sc->kva, npages); 1008 if (error == 0) { 1009 len -= iolen; 1010 bp->bio_resid -= iolen; 1011 ma_offs += iolen; 1012 if (len > 0) 1013 goto unmapped_step; 1014 } 1015 } else { 1016 bp->bio_resid = auio.uio_resid; 1017 } 1018 1019 free(piov, M_MD); 1020 return (error); 1021 } 1022 1023 static int 1024 mdstart_swap(struct md_s *sc, struct bio *bp) 1025 { 1026 vm_page_t m; 1027 u_char *p; 1028 vm_pindex_t i, lastp; 1029 bus_dma_segment_t *vlist; 1030 int rv, ma_offs, offs, len, lastend; 1031 1032 switch (bp->bio_cmd) { 1033 case BIO_READ: 1034 case BIO_WRITE: 1035 case BIO_DELETE: 1036 break; 1037 case BIO_FLUSH: 1038 return (0); 1039 default: 1040 return (EOPNOTSUPP); 1041 } 1042 1043 p = bp->bio_data; 1044 ma_offs = (bp->bio_flags & (BIO_UNMAPPED|BIO_VLIST)) != 0 ? 1045 bp->bio_ma_offset : 0; 1046 vlist = (bp->bio_flags & BIO_VLIST) != 0 ? 1047 (bus_dma_segment_t *)bp->bio_data : NULL; 1048 1049 /* 1050 * offs is the offset at which to start operating on the 1051 * next (ie, first) page. lastp is the last page on 1052 * which we're going to operate. lastend is the ending 1053 * position within that last page (ie, PAGE_SIZE if 1054 * we're operating on complete aligned pages). 1055 */ 1056 offs = bp->bio_offset % PAGE_SIZE; 1057 lastp = (bp->bio_offset + bp->bio_length - 1) / PAGE_SIZE; 1058 lastend = (bp->bio_offset + bp->bio_length - 1) % PAGE_SIZE + 1; 1059 1060 rv = VM_PAGER_OK; 1061 vm_object_pip_add(sc->object, 1); 1062 for (i = bp->bio_offset / PAGE_SIZE; i <= lastp; i++) { 1063 len = ((i == lastp) ? lastend : PAGE_SIZE) - offs; 1064 m = vm_page_grab_unlocked(sc->object, i, VM_ALLOC_SYSTEM); 1065 if (bp->bio_cmd == BIO_READ) { 1066 if (vm_page_all_valid(m)) 1067 rv = VM_PAGER_OK; 1068 else 1069 rv = vm_pager_get_pages(sc->object, &m, 1, 1070 NULL, NULL); 1071 if (rv == VM_PAGER_ERROR) { 1072 VM_OBJECT_WLOCK(sc->object); 1073 vm_page_free(m); 1074 VM_OBJECT_WUNLOCK(sc->object); 1075 break; 1076 } else if (rv == VM_PAGER_FAIL) { 1077 /* 1078 * Pager does not have the page. Zero 1079 * the allocated page, and mark it as 1080 * valid. Do not set dirty, the page 1081 * can be recreated if thrown out. 1082 */ 1083 pmap_zero_page(m); 1084 vm_page_valid(m); 1085 } 1086 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 1087 pmap_copy_pages(&m, offs, bp->bio_ma, 1088 ma_offs, len); 1089 } else if ((bp->bio_flags & BIO_VLIST) != 0) { 1090 physcopyout_vlist(VM_PAGE_TO_PHYS(m) + offs, 1091 vlist, ma_offs, len); 1092 cpu_flush_dcache(p, len); 1093 } else { 1094 physcopyout(VM_PAGE_TO_PHYS(m) + offs, p, len); 1095 cpu_flush_dcache(p, len); 1096 } 1097 } else if (bp->bio_cmd == BIO_WRITE) { 1098 if (len == PAGE_SIZE || vm_page_all_valid(m)) 1099 rv = VM_PAGER_OK; 1100 else 1101 rv = vm_pager_get_pages(sc->object, &m, 1, 1102 NULL, NULL); 1103 if (rv == VM_PAGER_ERROR) { 1104 VM_OBJECT_WLOCK(sc->object); 1105 vm_page_free(m); 1106 VM_OBJECT_WUNLOCK(sc->object); 1107 break; 1108 } else if (rv == VM_PAGER_FAIL) 1109 pmap_zero_page(m); 1110 1111 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 1112 pmap_copy_pages(bp->bio_ma, ma_offs, &m, 1113 offs, len); 1114 } else if ((bp->bio_flags & BIO_VLIST) != 0) { 1115 physcopyin_vlist(vlist, ma_offs, 1116 VM_PAGE_TO_PHYS(m) + offs, len); 1117 } else { 1118 physcopyin(p, VM_PAGE_TO_PHYS(m) + offs, len); 1119 } 1120 1121 vm_page_valid(m); 1122 vm_page_set_dirty(m); 1123 } else if (bp->bio_cmd == BIO_DELETE) { 1124 if (len == PAGE_SIZE || vm_page_all_valid(m)) 1125 rv = VM_PAGER_OK; 1126 else 1127 rv = vm_pager_get_pages(sc->object, &m, 1, 1128 NULL, NULL); 1129 VM_OBJECT_WLOCK(sc->object); 1130 if (rv == VM_PAGER_ERROR) { 1131 vm_page_free(m); 1132 VM_OBJECT_WUNLOCK(sc->object); 1133 break; 1134 } else if (rv == VM_PAGER_FAIL) { 1135 vm_page_free(m); 1136 m = NULL; 1137 } else { 1138 /* Page is valid. */ 1139 if (len != PAGE_SIZE) { 1140 pmap_zero_page_area(m, offs, len); 1141 vm_page_set_dirty(m); 1142 } else { 1143 vm_pager_page_unswapped(m); 1144 vm_page_free(m); 1145 m = NULL; 1146 } 1147 } 1148 VM_OBJECT_WUNLOCK(sc->object); 1149 } 1150 if (m != NULL) { 1151 /* 1152 * The page may be deactivated prior to setting 1153 * PGA_REFERENCED, but in this case it will be 1154 * reactivated by the page daemon. 1155 */ 1156 if (vm_page_active(m)) 1157 vm_page_reference(m); 1158 else 1159 vm_page_activate(m); 1160 vm_page_xunbusy(m); 1161 } 1162 1163 /* Actions on further pages start at offset 0 */ 1164 p += PAGE_SIZE - offs; 1165 offs = 0; 1166 ma_offs += len; 1167 } 1168 vm_object_pip_wakeup(sc->object); 1169 return (rv != VM_PAGER_ERROR ? 0 : ENOSPC); 1170 } 1171 1172 static int 1173 mdstart_null(struct md_s *sc, struct bio *bp) 1174 { 1175 1176 switch (bp->bio_cmd) { 1177 case BIO_READ: 1178 bzero(bp->bio_data, bp->bio_length); 1179 cpu_flush_dcache(bp->bio_data, bp->bio_length); 1180 break; 1181 case BIO_WRITE: 1182 break; 1183 } 1184 bp->bio_resid = 0; 1185 return (0); 1186 } 1187 1188 static void 1189 md_handleattr(struct md_s *sc, struct bio *bp) 1190 { 1191 if (sc->fwsectors && sc->fwheads && 1192 (g_handleattr_int(bp, "GEOM::fwsectors", sc->fwsectors) != 0 || 1193 g_handleattr_int(bp, "GEOM::fwheads", sc->fwheads) != 0)) 1194 return; 1195 if (g_handleattr_int(bp, "GEOM::candelete", sc->candelete) != 0) 1196 return; 1197 if (sc->ident[0] != '\0' && 1198 g_handleattr_str(bp, "GEOM::ident", sc->ident) != 0) 1199 return; 1200 if (g_handleattr_int(bp, "MNT::verified", (sc->flags & MD_VERIFY) != 0)) 1201 return; 1202 g_io_deliver(bp, EOPNOTSUPP); 1203 } 1204 1205 static void 1206 md_kthread(void *arg) 1207 { 1208 struct md_s *sc; 1209 struct bio *bp; 1210 int error; 1211 1212 sc = arg; 1213 thread_lock(curthread); 1214 sched_prio(curthread, PRIBIO); 1215 thread_unlock(curthread); 1216 if (sc->type == MD_VNODE) 1217 curthread->td_pflags |= TDP_NORUNNINGBUF; 1218 1219 for (;;) { 1220 mtx_lock(&sc->queue_mtx); 1221 if (sc->flags & MD_SHUTDOWN) { 1222 sc->flags |= MD_EXITING; 1223 mtx_unlock(&sc->queue_mtx); 1224 kproc_exit(0); 1225 } 1226 bp = bioq_takefirst(&sc->bio_queue); 1227 if (!bp) { 1228 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 1229 continue; 1230 } 1231 mtx_unlock(&sc->queue_mtx); 1232 if (bp->bio_cmd == BIO_GETATTR) { 1233 md_handleattr(sc, bp); 1234 } else { 1235 error = sc->start(sc, bp); 1236 if (bp->bio_cmd == BIO_READ || bp->bio_cmd == BIO_WRITE) { 1237 /* 1238 * Devstat uses (bio_bcount, bio_resid) for 1239 * determining the length of the completed part 1240 * of the i/o. g_io_deliver() will translate 1241 * from bio_completed to that, but it also 1242 * destroys the bio so we must do our own 1243 * translation. 1244 */ 1245 bp->bio_bcount = bp->bio_length; 1246 devstat_end_transaction_bio(sc->devstat, bp); 1247 } 1248 bp->bio_completed = bp->bio_length - bp->bio_resid; 1249 g_io_deliver(bp, error); 1250 } 1251 } 1252 } 1253 1254 static struct md_s * 1255 mdfind(int unit) 1256 { 1257 struct md_s *sc; 1258 1259 LIST_FOREACH(sc, &md_softc_list, list) { 1260 if (sc->unit == unit) 1261 break; 1262 } 1263 return (sc); 1264 } 1265 1266 static struct md_s * 1267 mdnew(int unit, int *errp, enum md_types type) 1268 { 1269 struct md_s *sc; 1270 int error; 1271 1272 *errp = 0; 1273 if (unit == -1) 1274 unit = alloc_unr(md_uh); 1275 else 1276 unit = alloc_unr_specific(md_uh, unit); 1277 1278 if (unit == -1) { 1279 *errp = EBUSY; 1280 return (NULL); 1281 } 1282 1283 sc = malloc(sizeof(*sc), M_MD, M_WAITOK | M_ZERO); 1284 sc->type = type; 1285 bioq_init(&sc->bio_queue); 1286 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 1287 sc->unit = unit; 1288 sprintf(sc->name, "md%d", unit); 1289 LIST_INSERT_HEAD(&md_softc_list, sc, list); 1290 error = kproc_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 1291 if (error == 0) 1292 return (sc); 1293 LIST_REMOVE(sc, list); 1294 mtx_destroy(&sc->queue_mtx); 1295 free_unr(md_uh, sc->unit); 1296 free(sc, M_MD); 1297 *errp = error; 1298 return (NULL); 1299 } 1300 1301 static void 1302 mdinit(struct md_s *sc) 1303 { 1304 struct g_geom *gp; 1305 struct g_provider *pp; 1306 unsigned remn; 1307 1308 g_topology_lock(); 1309 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 1310 gp->softc = sc; 1311 pp = g_new_providerf(gp, "md%d", sc->unit); 1312 devstat_remove_entry(pp->stat); 1313 pp->stat = NULL; 1314 pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE; 1315 /* Prune off any residual fractional sector. */ 1316 remn = sc->mediasize % sc->sectorsize; 1317 if (remn != 0) { 1318 printf("md%d: truncating fractional last sector by %u bytes\n", 1319 sc->unit, remn); 1320 sc->mediasize -= remn; 1321 } 1322 pp->mediasize = sc->mediasize; 1323 pp->sectorsize = sc->sectorsize; 1324 switch (sc->type) { 1325 case MD_MALLOC: 1326 case MD_VNODE: 1327 case MD_SWAP: 1328 pp->flags |= G_PF_ACCEPT_UNMAPPED; 1329 break; 1330 case MD_PRELOAD: 1331 case MD_NULL: 1332 break; 1333 } 1334 sc->gp = gp; 1335 sc->pp = pp; 1336 sc->devstat = devstat_new_entry("md", sc->unit, sc->sectorsize, 1337 DEVSTAT_ALL_SUPPORTED, DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 1338 sc->devstat->id = pp; 1339 g_error_provider(pp, 0); 1340 g_topology_unlock(); 1341 } 1342 1343 static int 1344 mdcreate_malloc(struct md_s *sc, struct md_req *mdr) 1345 { 1346 uintptr_t sp; 1347 int error; 1348 off_t u; 1349 1350 error = 0; 1351 if (mdr->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 1352 return (EINVAL); 1353 if (mdr->md_sectorsize != 0 && !powerof2(mdr->md_sectorsize)) 1354 return (EINVAL); 1355 /* Compression doesn't make sense if we have reserved space */ 1356 if (mdr->md_options & MD_RESERVE) 1357 mdr->md_options &= ~MD_COMPRESS; 1358 if (mdr->md_fwsectors != 0) 1359 sc->fwsectors = mdr->md_fwsectors; 1360 if (mdr->md_fwheads != 0) 1361 sc->fwheads = mdr->md_fwheads; 1362 sc->flags = mdr->md_options & (MD_COMPRESS | MD_FORCE | MD_RESERVE); 1363 sc->indir = dimension(sc->mediasize / sc->sectorsize); 1364 sc->uma = uma_zcreate(sc->name, sc->sectorsize, NULL, NULL, NULL, NULL, 1365 0x1ff, 0); 1366 if (mdr->md_options & MD_RESERVE) { 1367 off_t nsectors; 1368 1369 nsectors = sc->mediasize / sc->sectorsize; 1370 for (u = 0; u < nsectors; u++) { 1371 sp = (uintptr_t)uma_zalloc(sc->uma, (md_malloc_wait ? 1372 M_WAITOK : M_NOWAIT) | M_ZERO); 1373 if (sp != 0) 1374 error = s_write(sc->indir, u, sp); 1375 else 1376 error = ENOMEM; 1377 if (error != 0) 1378 break; 1379 } 1380 } 1381 return (error); 1382 } 1383 1384 static int 1385 mdsetcred(struct md_s *sc, struct ucred *cred) 1386 { 1387 char *tmpbuf; 1388 int error = 0; 1389 1390 /* 1391 * Set credits in our softc 1392 */ 1393 1394 if (sc->cred) 1395 crfree(sc->cred); 1396 sc->cred = crhold(cred); 1397 1398 /* 1399 * Horrible kludge to establish credentials for NFS XXX. 1400 */ 1401 1402 if (sc->vnode) { 1403 struct uio auio; 1404 struct iovec aiov; 1405 1406 tmpbuf = malloc(sc->sectorsize, M_TEMP, M_WAITOK); 1407 bzero(&auio, sizeof(auio)); 1408 1409 aiov.iov_base = tmpbuf; 1410 aiov.iov_len = sc->sectorsize; 1411 auio.uio_iov = &aiov; 1412 auio.uio_iovcnt = 1; 1413 auio.uio_offset = 0; 1414 auio.uio_rw = UIO_READ; 1415 auio.uio_segflg = UIO_SYSSPACE; 1416 auio.uio_resid = aiov.iov_len; 1417 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY); 1418 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 1419 VOP_UNLOCK(sc->vnode); 1420 free(tmpbuf, M_TEMP); 1421 } 1422 return (error); 1423 } 1424 1425 static int 1426 mdcreate_vnode(struct md_s *sc, struct md_req *mdr, struct thread *td) 1427 { 1428 struct vattr vattr; 1429 struct nameidata nd; 1430 char *fname; 1431 int error, flags; 1432 long v; 1433 1434 fname = mdr->md_file; 1435 if (mdr->md_file_seg == UIO_USERSPACE) { 1436 error = copyinstr(fname, sc->file, sizeof(sc->file), NULL); 1437 if (error != 0) 1438 return (error); 1439 } else if (mdr->md_file_seg == UIO_SYSSPACE) 1440 strlcpy(sc->file, fname, sizeof(sc->file)); 1441 else 1442 return (EDOOFUS); 1443 1444 /* 1445 * If the user specified that this is a read only device, don't 1446 * set the FWRITE mask before trying to open the backing store. 1447 */ 1448 flags = FREAD | ((mdr->md_options & MD_READONLY) ? 0 : FWRITE) \ 1449 | ((mdr->md_options & MD_VERIFY) ? O_VERIFY : 0); 1450 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, sc->file); 1451 error = vn_open(&nd, &flags, 0, NULL); 1452 if (error != 0) 1453 return (error); 1454 NDFREE_PNBUF(&nd); 1455 if (nd.ni_vp->v_type != VREG) { 1456 error = EINVAL; 1457 goto bad; 1458 } 1459 error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred); 1460 if (error != 0) 1461 goto bad; 1462 if ((mdr->md_options & MD_MUSTDEALLOC) != 0) { 1463 error = VOP_PATHCONF(nd.ni_vp, _PC_DEALLOC_PRESENT, &v); 1464 if (error != 0) 1465 goto bad; 1466 if (v == 0) 1467 sc->candelete = false; 1468 } 1469 if (VOP_ISLOCKED(nd.ni_vp) != LK_EXCLUSIVE) { 1470 vn_lock(nd.ni_vp, LK_UPGRADE | LK_RETRY); 1471 if (VN_IS_DOOMED(nd.ni_vp)) { 1472 /* Forced unmount. */ 1473 error = EBADF; 1474 goto bad; 1475 } 1476 } 1477 nd.ni_vp->v_vflag |= VV_MD; 1478 VOP_UNLOCK(nd.ni_vp); 1479 1480 if (mdr->md_fwsectors != 0) 1481 sc->fwsectors = mdr->md_fwsectors; 1482 if (mdr->md_fwheads != 0) 1483 sc->fwheads = mdr->md_fwheads; 1484 snprintf(sc->ident, sizeof(sc->ident), "MD-DEV%ju-INO%ju", 1485 (uintmax_t)vattr.va_fsid, (uintmax_t)vattr.va_fileid); 1486 sc->flags = mdr->md_options & (MD_ASYNC | MD_CACHE | MD_FORCE | 1487 MD_VERIFY | MD_MUSTDEALLOC); 1488 if (!(flags & FWRITE)) 1489 sc->flags |= MD_READONLY; 1490 sc->vnode = nd.ni_vp; 1491 1492 error = mdsetcred(sc, td->td_ucred); 1493 if (error != 0) { 1494 sc->vnode = NULL; 1495 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY); 1496 nd.ni_vp->v_vflag &= ~VV_MD; 1497 goto bad; 1498 } 1499 1500 sc->kva = kva_alloc(MAXPHYS + PAGE_SIZE); 1501 return (0); 1502 bad: 1503 VOP_UNLOCK(nd.ni_vp); 1504 (void)vn_close(nd.ni_vp, flags, td->td_ucred, td); 1505 return (error); 1506 } 1507 1508 static void 1509 g_md_providergone(struct g_provider *pp) 1510 { 1511 struct md_s *sc = pp->geom->softc; 1512 1513 mtx_lock(&sc->queue_mtx); 1514 sc->flags |= MD_PROVIDERGONE; 1515 wakeup(&sc->flags); 1516 mtx_unlock(&sc->queue_mtx); 1517 } 1518 1519 static int 1520 mddestroy(struct md_s *sc, struct thread *td) 1521 { 1522 1523 if (sc->gp) { 1524 g_topology_lock(); 1525 g_wither_geom(sc->gp, ENXIO); 1526 g_topology_unlock(); 1527 1528 mtx_lock(&sc->queue_mtx); 1529 while (!(sc->flags & MD_PROVIDERGONE)) 1530 msleep(&sc->flags, &sc->queue_mtx, PRIBIO, "mddestroy", 0); 1531 mtx_unlock(&sc->queue_mtx); 1532 } 1533 if (sc->devstat) { 1534 devstat_remove_entry(sc->devstat); 1535 sc->devstat = NULL; 1536 } 1537 mtx_lock(&sc->queue_mtx); 1538 sc->flags |= MD_SHUTDOWN; 1539 wakeup(sc); 1540 while (!(sc->flags & MD_EXITING)) 1541 msleep(sc->procp, &sc->queue_mtx, PRIBIO, "mddestroy", hz / 10); 1542 mtx_unlock(&sc->queue_mtx); 1543 mtx_destroy(&sc->queue_mtx); 1544 if (sc->vnode != NULL) { 1545 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY); 1546 sc->vnode->v_vflag &= ~VV_MD; 1547 VOP_UNLOCK(sc->vnode); 1548 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 1549 FREAD : (FREAD|FWRITE), sc->cred, td); 1550 } 1551 if (sc->cred != NULL) 1552 crfree(sc->cred); 1553 if (sc->object != NULL) 1554 vm_object_deallocate(sc->object); 1555 if (sc->indir) 1556 destroy_indir(sc, sc->indir); 1557 if (sc->uma) 1558 uma_zdestroy(sc->uma); 1559 if (sc->kva) 1560 kva_free(sc->kva, MAXPHYS + PAGE_SIZE); 1561 1562 LIST_REMOVE(sc, list); 1563 free_unr(md_uh, sc->unit); 1564 free(sc, M_MD); 1565 return (0); 1566 } 1567 1568 static int 1569 mdresize(struct md_s *sc, struct md_req *mdr) 1570 { 1571 int error, res; 1572 vm_pindex_t oldpages, newpages; 1573 1574 switch (sc->type) { 1575 case MD_VNODE: 1576 case MD_NULL: 1577 break; 1578 case MD_SWAP: 1579 if (mdr->md_mediasize <= 0 || 1580 (mdr->md_mediasize % PAGE_SIZE) != 0) 1581 return (EDOM); 1582 oldpages = OFF_TO_IDX(sc->mediasize); 1583 newpages = OFF_TO_IDX(mdr->md_mediasize); 1584 if (newpages < oldpages) { 1585 VM_OBJECT_WLOCK(sc->object); 1586 vm_object_page_remove(sc->object, newpages, 0, 0); 1587 swap_release_by_cred(IDX_TO_OFF(oldpages - 1588 newpages), sc->cred); 1589 sc->object->charge = IDX_TO_OFF(newpages); 1590 sc->object->size = newpages; 1591 VM_OBJECT_WUNLOCK(sc->object); 1592 } else if (newpages > oldpages) { 1593 res = swap_reserve_by_cred(IDX_TO_OFF(newpages - 1594 oldpages), sc->cred); 1595 if (!res) 1596 return (ENOMEM); 1597 if ((mdr->md_options & MD_RESERVE) || 1598 (sc->flags & MD_RESERVE)) { 1599 error = swap_pager_reserve(sc->object, 1600 oldpages, newpages - oldpages); 1601 if (error < 0) { 1602 swap_release_by_cred( 1603 IDX_TO_OFF(newpages - oldpages), 1604 sc->cred); 1605 return (EDOM); 1606 } 1607 } 1608 VM_OBJECT_WLOCK(sc->object); 1609 sc->object->charge = IDX_TO_OFF(newpages); 1610 sc->object->size = newpages; 1611 VM_OBJECT_WUNLOCK(sc->object); 1612 } 1613 break; 1614 default: 1615 return (EOPNOTSUPP); 1616 } 1617 1618 sc->mediasize = mdr->md_mediasize; 1619 1620 g_topology_lock(); 1621 g_resize_provider(sc->pp, sc->mediasize); 1622 g_topology_unlock(); 1623 return (0); 1624 } 1625 1626 static int 1627 mdcreate_swap(struct md_s *sc, struct md_req *mdr, struct thread *td) 1628 { 1629 vm_ooffset_t npage; 1630 int error; 1631 1632 /* 1633 * Range check. Disallow negative sizes and sizes not being 1634 * multiple of page size. 1635 */ 1636 if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0) 1637 return (EDOM); 1638 1639 /* 1640 * Allocate an OBJT_SWAP object. 1641 * 1642 * Note the truncation. 1643 */ 1644 1645 if ((mdr->md_options & MD_VERIFY) != 0) 1646 return (EINVAL); 1647 npage = mdr->md_mediasize / PAGE_SIZE; 1648 if (mdr->md_fwsectors != 0) 1649 sc->fwsectors = mdr->md_fwsectors; 1650 if (mdr->md_fwheads != 0) 1651 sc->fwheads = mdr->md_fwheads; 1652 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * npage, 1653 VM_PROT_DEFAULT, 0, td->td_ucred); 1654 if (sc->object == NULL) 1655 return (ENOMEM); 1656 sc->flags = mdr->md_options & (MD_FORCE | MD_RESERVE); 1657 if (mdr->md_options & MD_RESERVE) { 1658 if (swap_pager_reserve(sc->object, 0, npage) < 0) { 1659 error = EDOM; 1660 goto finish; 1661 } 1662 } 1663 error = mdsetcred(sc, td->td_ucred); 1664 finish: 1665 if (error != 0) { 1666 vm_object_deallocate(sc->object); 1667 sc->object = NULL; 1668 } 1669 return (error); 1670 } 1671 1672 static int 1673 mdcreate_null(struct md_s *sc, struct md_req *mdr, struct thread *td) 1674 { 1675 1676 /* 1677 * Range check. Disallow negative sizes and sizes not being 1678 * multiple of page size. 1679 */ 1680 if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0) 1681 return (EDOM); 1682 1683 return (0); 1684 } 1685 1686 static int 1687 kern_mdattach_locked(struct thread *td, struct md_req *mdr) 1688 { 1689 struct md_s *sc; 1690 unsigned sectsize; 1691 int error; 1692 1693 sx_assert(&md_sx, SA_XLOCKED); 1694 1695 switch (mdr->md_type) { 1696 case MD_MALLOC: 1697 case MD_PRELOAD: 1698 case MD_VNODE: 1699 case MD_SWAP: 1700 case MD_NULL: 1701 break; 1702 default: 1703 return (EINVAL); 1704 } 1705 if (mdr->md_sectorsize == 0) 1706 sectsize = DEV_BSIZE; 1707 else 1708 sectsize = mdr->md_sectorsize; 1709 if (sectsize > maxphys || mdr->md_mediasize < sectsize) 1710 return (EINVAL); 1711 if (mdr->md_options & MD_AUTOUNIT) 1712 sc = mdnew(-1, &error, mdr->md_type); 1713 else { 1714 if (mdr->md_unit > INT_MAX) 1715 return (EINVAL); 1716 sc = mdnew(mdr->md_unit, &error, mdr->md_type); 1717 } 1718 if (sc == NULL) 1719 return (error); 1720 if (mdr->md_label != NULL) 1721 error = copyinstr(mdr->md_label, sc->label, 1722 sizeof(sc->label), NULL); 1723 if (error != 0) 1724 goto err_after_new; 1725 if (mdr->md_options & MD_AUTOUNIT) 1726 mdr->md_unit = sc->unit; 1727 sc->mediasize = mdr->md_mediasize; 1728 sc->sectorsize = sectsize; 1729 sc->candelete = true; 1730 error = EDOOFUS; 1731 switch (sc->type) { 1732 case MD_MALLOC: 1733 sc->start = mdstart_malloc; 1734 error = mdcreate_malloc(sc, mdr); 1735 break; 1736 case MD_PRELOAD: 1737 /* 1738 * We disallow attaching preloaded memory disks via 1739 * ioctl. Preloaded memory disks are automatically 1740 * attached in g_md_init(). 1741 */ 1742 error = EOPNOTSUPP; 1743 break; 1744 case MD_VNODE: 1745 sc->start = mdstart_vnode; 1746 error = mdcreate_vnode(sc, mdr, td); 1747 break; 1748 case MD_SWAP: 1749 sc->start = mdstart_swap; 1750 error = mdcreate_swap(sc, mdr, td); 1751 break; 1752 case MD_NULL: 1753 sc->start = mdstart_null; 1754 error = mdcreate_null(sc, mdr, td); 1755 break; 1756 } 1757 err_after_new: 1758 if (error != 0) { 1759 mddestroy(sc, td); 1760 return (error); 1761 } 1762 1763 mdinit(sc); 1764 return (0); 1765 } 1766 1767 static int 1768 kern_mdattach(struct thread *td, struct md_req *mdr) 1769 { 1770 int error; 1771 1772 sx_xlock(&md_sx); 1773 error = kern_mdattach_locked(td, mdr); 1774 sx_xunlock(&md_sx); 1775 return (error); 1776 } 1777 1778 static int 1779 kern_mddetach_locked(struct thread *td, struct md_req *mdr) 1780 { 1781 struct md_s *sc; 1782 1783 sx_assert(&md_sx, SA_XLOCKED); 1784 1785 if (mdr->md_mediasize != 0 || 1786 (mdr->md_options & ~MD_FORCE) != 0) 1787 return (EINVAL); 1788 1789 sc = mdfind(mdr->md_unit); 1790 if (sc == NULL) 1791 return (ENOENT); 1792 if (sc->opencount != 0 && !(sc->flags & MD_FORCE) && 1793 !(mdr->md_options & MD_FORCE)) 1794 return (EBUSY); 1795 return (mddestroy(sc, td)); 1796 } 1797 1798 static int 1799 kern_mddetach(struct thread *td, struct md_req *mdr) 1800 { 1801 int error; 1802 1803 sx_xlock(&md_sx); 1804 error = kern_mddetach_locked(td, mdr); 1805 sx_xunlock(&md_sx); 1806 return (error); 1807 } 1808 1809 static int 1810 kern_mdresize_locked(struct md_req *mdr) 1811 { 1812 struct md_s *sc; 1813 1814 sx_assert(&md_sx, SA_XLOCKED); 1815 1816 if ((mdr->md_options & ~(MD_FORCE | MD_RESERVE)) != 0) 1817 return (EINVAL); 1818 1819 sc = mdfind(mdr->md_unit); 1820 if (sc == NULL) 1821 return (ENOENT); 1822 if (mdr->md_mediasize < sc->sectorsize) 1823 return (EINVAL); 1824 mdr->md_mediasize -= mdr->md_mediasize % sc->sectorsize; 1825 if (mdr->md_mediasize < sc->mediasize && 1826 !(sc->flags & MD_FORCE) && 1827 !(mdr->md_options & MD_FORCE)) 1828 return (EBUSY); 1829 return (mdresize(sc, mdr)); 1830 } 1831 1832 static int 1833 kern_mdresize(struct md_req *mdr) 1834 { 1835 int error; 1836 1837 sx_xlock(&md_sx); 1838 error = kern_mdresize_locked(mdr); 1839 sx_xunlock(&md_sx); 1840 return (error); 1841 } 1842 1843 static int 1844 kern_mdquery_locked(struct md_req *mdr) 1845 { 1846 struct md_s *sc; 1847 int error; 1848 1849 sx_assert(&md_sx, SA_XLOCKED); 1850 1851 sc = mdfind(mdr->md_unit); 1852 if (sc == NULL) 1853 return (ENOENT); 1854 mdr->md_type = sc->type; 1855 mdr->md_options = sc->flags; 1856 mdr->md_mediasize = sc->mediasize; 1857 mdr->md_sectorsize = sc->sectorsize; 1858 error = 0; 1859 if (mdr->md_label != NULL) { 1860 error = copyout(sc->label, mdr->md_label, 1861 strlen(sc->label) + 1); 1862 if (error != 0) 1863 return (error); 1864 } 1865 if (sc->type == MD_VNODE || 1866 (sc->type == MD_PRELOAD && mdr->md_file != NULL)) 1867 error = copyout(sc->file, mdr->md_file, 1868 strlen(sc->file) + 1); 1869 return (error); 1870 } 1871 1872 static int 1873 kern_mdquery(struct md_req *mdr) 1874 { 1875 int error; 1876 1877 sx_xlock(&md_sx); 1878 error = kern_mdquery_locked(mdr); 1879 sx_xunlock(&md_sx); 1880 return (error); 1881 } 1882 1883 /* Copy members that are not userspace pointers. */ 1884 #define MD_IOCTL2REQ(mdio, mdr) do { \ 1885 (mdr)->md_unit = (mdio)->md_unit; \ 1886 (mdr)->md_type = (mdio)->md_type; \ 1887 (mdr)->md_mediasize = (mdio)->md_mediasize; \ 1888 (mdr)->md_sectorsize = (mdio)->md_sectorsize; \ 1889 (mdr)->md_options = (mdio)->md_options; \ 1890 (mdr)->md_fwheads = (mdio)->md_fwheads; \ 1891 (mdr)->md_fwsectors = (mdio)->md_fwsectors; \ 1892 (mdr)->md_units = &(mdio)->md_pad[0]; \ 1893 (mdr)->md_units_nitems = nitems((mdio)->md_pad); \ 1894 } while(0) 1895 1896 /* Copy members that might have been updated */ 1897 #define MD_REQ2IOCTL(mdr, mdio) do { \ 1898 (mdio)->md_unit = (mdr)->md_unit; \ 1899 (mdio)->md_type = (mdr)->md_type; \ 1900 (mdio)->md_mediasize = (mdr)->md_mediasize; \ 1901 (mdio)->md_sectorsize = (mdr)->md_sectorsize; \ 1902 (mdio)->md_options = (mdr)->md_options; \ 1903 (mdio)->md_fwheads = (mdr)->md_fwheads; \ 1904 (mdio)->md_fwsectors = (mdr)->md_fwsectors; \ 1905 } while(0) 1906 1907 static int 1908 mdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, 1909 struct thread *td) 1910 { 1911 struct md_req mdr; 1912 int error; 1913 1914 if (md_debug) 1915 printf("mdctlioctl(%s %lx %p %x %p)\n", 1916 devtoname(dev), cmd, addr, flags, td); 1917 1918 bzero(&mdr, sizeof(mdr)); 1919 switch (cmd) { 1920 case MDIOCATTACH: 1921 case MDIOCDETACH: 1922 case MDIOCRESIZE: 1923 case MDIOCQUERY: { 1924 struct md_ioctl *mdio = (struct md_ioctl *)addr; 1925 if (mdio->md_version != MDIOVERSION) 1926 return (EINVAL); 1927 MD_IOCTL2REQ(mdio, &mdr); 1928 mdr.md_file = mdio->md_file; 1929 mdr.md_file_seg = UIO_USERSPACE; 1930 /* If the file is adjacent to the md_ioctl it's in kernel. */ 1931 if ((void *)mdio->md_file == (void *)(mdio + 1)) 1932 mdr.md_file_seg = UIO_SYSSPACE; 1933 mdr.md_label = mdio->md_label; 1934 break; 1935 } 1936 #ifdef COMPAT_FREEBSD32 1937 case MDIOCATTACH_32: 1938 case MDIOCDETACH_32: 1939 case MDIOCRESIZE_32: 1940 case MDIOCQUERY_32: { 1941 struct md_ioctl32 *mdio = (struct md_ioctl32 *)addr; 1942 if (mdio->md_version != MDIOVERSION) 1943 return (EINVAL); 1944 MD_IOCTL2REQ(mdio, &mdr); 1945 mdr.md_file = (void *)(uintptr_t)mdio->md_file; 1946 mdr.md_file_seg = UIO_USERSPACE; 1947 mdr.md_label = (void *)(uintptr_t)mdio->md_label; 1948 break; 1949 } 1950 #endif 1951 default: 1952 /* Fall through to handler switch. */ 1953 break; 1954 } 1955 1956 error = 0; 1957 switch (cmd) { 1958 case MDIOCATTACH: 1959 #ifdef COMPAT_FREEBSD32 1960 case MDIOCATTACH_32: 1961 #endif 1962 error = kern_mdattach(td, &mdr); 1963 break; 1964 case MDIOCDETACH: 1965 #ifdef COMPAT_FREEBSD32 1966 case MDIOCDETACH_32: 1967 #endif 1968 error = kern_mddetach(td, &mdr); 1969 break; 1970 case MDIOCRESIZE: 1971 #ifdef COMPAT_FREEBSD32 1972 case MDIOCRESIZE_32: 1973 #endif 1974 error = kern_mdresize(&mdr); 1975 break; 1976 case MDIOCQUERY: 1977 #ifdef COMPAT_FREEBSD32 1978 case MDIOCQUERY_32: 1979 #endif 1980 error = kern_mdquery(&mdr); 1981 break; 1982 default: 1983 error = ENOIOCTL; 1984 } 1985 1986 switch (cmd) { 1987 case MDIOCATTACH: 1988 case MDIOCQUERY: { 1989 struct md_ioctl *mdio = (struct md_ioctl *)addr; 1990 MD_REQ2IOCTL(&mdr, mdio); 1991 break; 1992 } 1993 #ifdef COMPAT_FREEBSD32 1994 case MDIOCATTACH_32: 1995 case MDIOCQUERY_32: { 1996 struct md_ioctl32 *mdio = (struct md_ioctl32 *)addr; 1997 MD_REQ2IOCTL(&mdr, mdio); 1998 break; 1999 } 2000 #endif 2001 default: 2002 /* Other commands to not alter mdr. */ 2003 break; 2004 } 2005 2006 return (error); 2007 } 2008 2009 static void 2010 md_preloaded(u_char *image, size_t length, const char *name) 2011 { 2012 struct md_s *sc; 2013 int error; 2014 2015 sc = mdnew(-1, &error, MD_PRELOAD); 2016 if (sc == NULL) 2017 return; 2018 sc->mediasize = length; 2019 sc->sectorsize = DEV_BSIZE; 2020 sc->pl_ptr = image; 2021 sc->pl_len = length; 2022 sc->start = mdstart_preload; 2023 if (name != NULL) 2024 strlcpy(sc->file, name, sizeof(sc->file)); 2025 #ifdef MD_ROOT 2026 if (sc->unit == 0) { 2027 #ifndef ROOTDEVNAME 2028 rootdevnames[0] = MD_ROOT_FSTYPE ":/dev/md0"; 2029 #endif 2030 #ifdef MD_ROOT_READONLY 2031 sc->flags |= MD_READONLY; 2032 #endif 2033 } 2034 #endif 2035 mdinit(sc); 2036 if (name != NULL) { 2037 printf("%s%d: Preloaded image <%s> %zd bytes at %p\n", 2038 MD_NAME, sc->unit, name, length, image); 2039 } else { 2040 printf("%s%d: Embedded image %zd bytes at %p\n", 2041 MD_NAME, sc->unit, length, image); 2042 } 2043 } 2044 2045 static void 2046 g_md_init(struct g_class *mp __unused) 2047 { 2048 caddr_t mod; 2049 u_char *ptr, *name, *type; 2050 unsigned len; 2051 int i; 2052 2053 /* figure out log2(NINDIR) */ 2054 for (i = NINDIR, nshift = -1; i; nshift++) 2055 i >>= 1; 2056 2057 mod = NULL; 2058 sx_init(&md_sx, "MD config lock"); 2059 g_topology_unlock(); 2060 md_uh = new_unrhdr(0, INT_MAX, NULL); 2061 #ifdef MD_ROOT 2062 if (mfs_root_size != 0) { 2063 sx_xlock(&md_sx); 2064 #ifdef MD_ROOT_MEM 2065 md_preloaded(mfs_root, mfs_root_size, NULL); 2066 #else 2067 md_preloaded(__DEVOLATILE(u_char *, &mfs_root), mfs_root_size, 2068 NULL); 2069 #endif 2070 sx_xunlock(&md_sx); 2071 } 2072 #endif 2073 /* XXX: are preload_* static or do they need Giant ? */ 2074 while ((mod = preload_search_next_name(mod)) != NULL) { 2075 name = (char *)preload_search_info(mod, MODINFO_NAME); 2076 if (name == NULL) 2077 continue; 2078 type = (char *)preload_search_info(mod, MODINFO_TYPE); 2079 if (type == NULL) 2080 continue; 2081 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 2082 continue; 2083 ptr = preload_fetch_addr(mod); 2084 len = preload_fetch_size(mod); 2085 if (ptr != NULL && len != 0) { 2086 sx_xlock(&md_sx); 2087 md_preloaded(ptr, len, name); 2088 sx_xunlock(&md_sx); 2089 } 2090 } 2091 status_dev = make_dev(&mdctl_cdevsw, INT_MAX, UID_ROOT, GID_WHEEL, 2092 0600, MDCTL_NAME); 2093 g_topology_lock(); 2094 } 2095 2096 static void 2097 g_md_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 2098 struct g_consumer *cp __unused, struct g_provider *pp) 2099 { 2100 struct md_s *mp; 2101 char *type; 2102 2103 mp = gp->softc; 2104 if (mp == NULL) 2105 return; 2106 2107 switch (mp->type) { 2108 case MD_MALLOC: 2109 type = "malloc"; 2110 break; 2111 case MD_PRELOAD: 2112 type = "preload"; 2113 break; 2114 case MD_VNODE: 2115 type = "vnode"; 2116 break; 2117 case MD_SWAP: 2118 type = "swap"; 2119 break; 2120 case MD_NULL: 2121 type = "null"; 2122 break; 2123 default: 2124 type = "unknown"; 2125 break; 2126 } 2127 2128 if (pp != NULL) { 2129 if (indent == NULL) { 2130 sbuf_printf(sb, " u %d", mp->unit); 2131 sbuf_printf(sb, " s %ju", (uintmax_t) mp->sectorsize); 2132 sbuf_printf(sb, " f %ju", (uintmax_t) mp->fwheads); 2133 sbuf_printf(sb, " fs %ju", (uintmax_t) mp->fwsectors); 2134 sbuf_printf(sb, " l %ju", (uintmax_t) mp->mediasize); 2135 sbuf_printf(sb, " t %s", type); 2136 if ((mp->type == MD_VNODE && mp->vnode != NULL) || 2137 (mp->type == MD_PRELOAD && mp->file[0] != '\0')) 2138 sbuf_printf(sb, " file %s", mp->file); 2139 sbuf_printf(sb, " label %s", mp->label); 2140 } else { 2141 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent, 2142 mp->unit); 2143 sbuf_printf(sb, "%s<sectorsize>%ju</sectorsize>\n", 2144 indent, (uintmax_t) mp->sectorsize); 2145 sbuf_printf(sb, "%s<fwheads>%ju</fwheads>\n", 2146 indent, (uintmax_t) mp->fwheads); 2147 sbuf_printf(sb, "%s<fwsectors>%ju</fwsectors>\n", 2148 indent, (uintmax_t) mp->fwsectors); 2149 if (mp->ident[0] != '\0') { 2150 sbuf_printf(sb, "%s<ident>", indent); 2151 g_conf_printf_escaped(sb, "%s", mp->ident); 2152 sbuf_printf(sb, "</ident>\n"); 2153 } 2154 sbuf_printf(sb, "%s<length>%ju</length>\n", 2155 indent, (uintmax_t) mp->mediasize); 2156 sbuf_printf(sb, "%s<compression>%s</compression>\n", indent, 2157 (mp->flags & MD_COMPRESS) == 0 ? "off": "on"); 2158 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 2159 (mp->flags & MD_READONLY) == 0 ? "read-write": 2160 "read-only"); 2161 sbuf_printf(sb, "%s<type>%s</type>\n", indent, 2162 type); 2163 if ((mp->type == MD_VNODE && mp->vnode != NULL) || 2164 (mp->type == MD_PRELOAD && mp->file[0] != '\0')) { 2165 sbuf_printf(sb, "%s<file>", indent); 2166 g_conf_printf_escaped(sb, "%s", mp->file); 2167 sbuf_printf(sb, "</file>\n"); 2168 } 2169 if (mp->type == MD_VNODE) 2170 sbuf_printf(sb, "%s<cache>%s</cache>\n", indent, 2171 (mp->flags & MD_CACHE) == 0 ? "off": "on"); 2172 sbuf_printf(sb, "%s<label>", indent); 2173 g_conf_printf_escaped(sb, "%s", mp->label); 2174 sbuf_printf(sb, "</label>\n"); 2175 } 2176 } 2177 } 2178 2179 static void 2180 g_md_fini(struct g_class *mp __unused) 2181 { 2182 2183 sx_destroy(&md_sx); 2184 if (status_dev != NULL) 2185 destroy_dev(status_dev); 2186 delete_unrhdr(md_uh); 2187 } 2188