Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/dev/md/md.c
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1 /*- 2 * SPDX-License-Identifier: (Beerware AND BSD-3-Clause) 3 * 4 * ---------------------------------------------------------------------------- 5 * "THE BEER-WARE LICENSE" (Revision 42): 6 * <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you 7 * can do whatever you want with this stuff. If we meet some day, and you think 8 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 9 * ---------------------------------------------------------------------------- 10 * 11 * $FreeBSD$ 12 * 13 */ 14 15 /*- 16 * The following functions are based on the vn(4) driver: mdstart_swap(), 17 * mdstart_vnode(), mdcreate_swap(), mdcreate_vnode() and mddestroy(), 18 * and as such under the following copyright: 19 * 20 * Copyright (c) 1988 University of Utah. 21 * Copyright (c) 1990, 1993 22 * The Regents of the University of California. All rights reserved. 23 * Copyright (c) 2013 The FreeBSD Foundation 24 * All rights reserved. 25 * 26 * This code is derived from software contributed to Berkeley by 27 * the Systems Programming Group of the University of Utah Computer 28 * Science Department. 29 * 30 * Portions of this software were developed by Konstantin Belousov 31 * under sponsorship from the FreeBSD Foundation. 32 * 33 * Redistribution and use in source and binary forms, with or without 34 * modification, are permitted provided that the following conditions 35 * are met: 36 * 1. Redistributions of source code must retain the above copyright 37 * notice, this list of conditions and the following disclaimer. 38 * 2. Redistributions in binary form must reproduce the above copyright 39 * notice, this list of conditions and the following disclaimer in the 40 * documentation and/or other materials provided with the distribution. 41 * 3. Neither the name of the University nor the names of its contributors 42 * may be used to endorse or promote products derived from this software 43 * without specific prior written permission. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 48 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 55 * SUCH DAMAGE. 56 * 57 * from: Utah Hdr: vn.c 1.13 94/04/02 58 * 59 * from: @(#)vn.c 8.6 (Berkeley) 4/1/94 60 * From: src/sys/dev/vn/vn.c,v 1.122 2000/12/16 16:06:03 61 */ 62 63 #include "opt_rootdevname.h" 64 #include "opt_geom.h" 65 #include "opt_md.h" 66 67 #include <sys/param.h> 68 #include <sys/systm.h> 69 #include <sys/bio.h> 70 #include <sys/buf.h> 71 #include <sys/conf.h> 72 #include <sys/devicestat.h> 73 #include <sys/fcntl.h> 74 #include <sys/kernel.h> 75 #include <sys/kthread.h> 76 #include <sys/limits.h> 77 #include <sys/linker.h> 78 #include <sys/lock.h> 79 #include <sys/malloc.h> 80 #include <sys/mdioctl.h> 81 #include <sys/mount.h> 82 #include <sys/mutex.h> 83 #include <sys/sx.h> 84 #include <sys/namei.h> 85 #include <sys/proc.h> 86 #include <sys/queue.h> 87 #include <sys/rwlock.h> 88 #include <sys/sbuf.h> 89 #include <sys/sched.h> 90 #include <sys/sf_buf.h> 91 #include <sys/sysctl.h> 92 #include <sys/uio.h> 93 #include <sys/vnode.h> 94 #include <sys/disk.h> 95 96 #include <geom/geom.h> 97 #include <geom/geom_int.h> 98 99 #include <vm/vm.h> 100 #include <vm/vm_param.h> 101 #include <vm/vm_object.h> 102 #include <vm/vm_page.h> 103 #include <vm/vm_pager.h> 104 #include <vm/swap_pager.h> 105 #include <vm/uma.h> 106 107 #include <machine/bus.h> 108 109 #define MD_MODVER 1 110 111 #define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */ 112 #define MD_EXITING 0x20000 /* Worker thread is exiting. */ 113 #define MD_PROVIDERGONE 0x40000 /* Safe to free the softc */ 114 115 #ifndef MD_NSECT 116 #define MD_NSECT (10000 * 2) 117 #endif 118 119 struct md_req { 120 unsigned md_unit; /* unit number */ 121 enum md_types md_type; /* type of disk */ 122 off_t md_mediasize; /* size of disk in bytes */ 123 unsigned md_sectorsize; /* sectorsize */ 124 unsigned md_options; /* options */ 125 int md_fwheads; /* firmware heads */ 126 int md_fwsectors; /* firmware sectors */ 127 char *md_file; /* pathname of file to mount */ 128 enum uio_seg md_file_seg; /* location of md_file */ 129 char *md_label; /* label of the device (userspace) */ 130 int *md_units; /* pointer to units array (kernel) */ 131 size_t md_units_nitems; /* items in md_units array */ 132 }; 133 134 #ifdef COMPAT_FREEBSD32 135 struct md_ioctl32 { 136 unsigned md_version; 137 unsigned md_unit; 138 enum md_types md_type; 139 uint32_t md_file; 140 off_t md_mediasize; 141 unsigned md_sectorsize; 142 unsigned md_options; 143 uint64_t md_base; 144 int md_fwheads; 145 int md_fwsectors; 146 uint32_t md_label; 147 int md_pad[MDNPAD]; 148 } __attribute__((__packed__)); 149 CTASSERT((sizeof(struct md_ioctl32)) == 436); 150 151 #define MDIOCATTACH_32 _IOC_NEWTYPE(MDIOCATTACH, struct md_ioctl32) 152 #define MDIOCDETACH_32 _IOC_NEWTYPE(MDIOCDETACH, struct md_ioctl32) 153 #define MDIOCQUERY_32 _IOC_NEWTYPE(MDIOCQUERY, struct md_ioctl32) 154 #define MDIOCRESIZE_32 _IOC_NEWTYPE(MDIOCRESIZE, struct md_ioctl32) 155 #endif /* COMPAT_FREEBSD32 */ 156 157 static MALLOC_DEFINE(M_MD, "md_disk", "Memory Disk"); 158 static MALLOC_DEFINE(M_MDSECT, "md_sectors", "Memory Disk Sectors"); 159 160 static int md_debug; 161 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, 162 "Enable md(4) debug messages"); 163 static int md_malloc_wait; 164 SYSCTL_INT(_vm, OID_AUTO, md_malloc_wait, CTLFLAG_RW, &md_malloc_wait, 0, 165 "Allow malloc to wait for memory allocations"); 166 167 #if defined(MD_ROOT) && !defined(MD_ROOT_FSTYPE) 168 #define MD_ROOT_FSTYPE "ufs" 169 #endif 170 171 #if defined(MD_ROOT) 172 /* 173 * Preloaded image gets put here. 174 */ 175 #if defined(MD_ROOT_SIZE) 176 /* 177 * We put the mfs_root symbol into the oldmfs section of the kernel object file. 178 * Applications that patch the object with the image can determine 179 * the size looking at the oldmfs section size within the kernel. 180 */ 181 u_char mfs_root[MD_ROOT_SIZE*1024] __attribute__ ((section ("oldmfs"))); 182 const int mfs_root_size = sizeof(mfs_root); 183 #elif defined(MD_ROOT_MEM) 184 /* MD region already mapped in the memory */ 185 u_char *mfs_root; 186 int mfs_root_size; 187 #else 188 extern volatile u_char __weak_symbol mfs_root; 189 extern volatile u_char __weak_symbol mfs_root_end; 190 __GLOBL(mfs_root); 191 __GLOBL(mfs_root_end); 192 #define mfs_root_size ((uintptr_t)(&mfs_root_end - &mfs_root)) 193 #endif 194 #endif 195 196 static g_init_t g_md_init; 197 static g_fini_t g_md_fini; 198 static g_start_t g_md_start; 199 static g_access_t g_md_access; 200 static void g_md_dumpconf(struct sbuf *sb, const char *indent, 201 struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp); 202 static g_provgone_t g_md_providergone; 203 204 static struct cdev *status_dev = NULL; 205 static struct sx md_sx; 206 static struct unrhdr *md_uh; 207 208 static d_ioctl_t mdctlioctl; 209 210 static struct cdevsw mdctl_cdevsw = { 211 .d_version = D_VERSION, 212 .d_ioctl = mdctlioctl, 213 .d_name = MD_NAME, 214 }; 215 216 struct g_class g_md_class = { 217 .name = "MD", 218 .version = G_VERSION, 219 .init = g_md_init, 220 .fini = g_md_fini, 221 .start = g_md_start, 222 .access = g_md_access, 223 .dumpconf = g_md_dumpconf, 224 .providergone = g_md_providergone, 225 }; 226 227 DECLARE_GEOM_CLASS(g_md_class, g_md); 228 229 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(md_softc_list); 230 231 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 232 #define NMASK (NINDIR-1) 233 static int nshift; 234 235 static uma_zone_t md_pbuf_zone; 236 237 struct indir { 238 uintptr_t *array; 239 u_int total; 240 u_int used; 241 u_int shift; 242 }; 243 244 struct md_s { 245 int unit; 246 LIST_ENTRY(md_s) list; 247 struct bio_queue_head bio_queue; 248 struct mtx queue_mtx; 249 struct cdev *dev; 250 enum md_types type; 251 off_t mediasize; 252 unsigned sectorsize; 253 unsigned opencount; 254 unsigned fwheads; 255 unsigned fwsectors; 256 char ident[32]; 257 unsigned flags; 258 char name[20]; 259 struct proc *procp; 260 struct g_geom *gp; 261 struct g_provider *pp; 262 int (*start)(struct md_s *sc, struct bio *bp); 263 struct devstat *devstat; 264 265 /* MD_MALLOC related fields */ 266 struct indir *indir; 267 uma_zone_t uma; 268 269 /* MD_PRELOAD related fields */ 270 u_char *pl_ptr; 271 size_t pl_len; 272 273 /* MD_VNODE related fields */ 274 struct vnode *vnode; 275 char file[PATH_MAX]; 276 char label[PATH_MAX]; 277 struct ucred *cred; 278 279 /* MD_SWAP related fields */ 280 vm_object_t object; 281 }; 282 283 static struct indir * 284 new_indir(u_int shift) 285 { 286 struct indir *ip; 287 288 ip = malloc(sizeof *ip, M_MD, (md_malloc_wait ? M_WAITOK : M_NOWAIT) 289 | M_ZERO); 290 if (ip == NULL) 291 return (NULL); 292 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 293 M_MDSECT, (md_malloc_wait ? M_WAITOK : M_NOWAIT) | M_ZERO); 294 if (ip->array == NULL) { 295 free(ip, M_MD); 296 return (NULL); 297 } 298 ip->total = NINDIR; 299 ip->shift = shift; 300 return (ip); 301 } 302 303 static void 304 del_indir(struct indir *ip) 305 { 306 307 free(ip->array, M_MDSECT); 308 free(ip, M_MD); 309 } 310 311 static void 312 destroy_indir(struct md_s *sc, struct indir *ip) 313 { 314 int i; 315 316 for (i = 0; i < NINDIR; i++) { 317 if (!ip->array[i]) 318 continue; 319 if (ip->shift) 320 destroy_indir(sc, (struct indir*)(ip->array[i])); 321 else if (ip->array[i] > 255) 322 uma_zfree(sc->uma, (void *)(ip->array[i])); 323 } 324 del_indir(ip); 325 } 326 327 /* 328 * This function does the math and allocates the top level "indir" structure 329 * for a device of "size" sectors. 330 */ 331 332 static struct indir * 333 dimension(off_t size) 334 { 335 off_t rcnt; 336 struct indir *ip; 337 int layer; 338 339 rcnt = size; 340 layer = 0; 341 while (rcnt > NINDIR) { 342 rcnt /= NINDIR; 343 layer++; 344 } 345 346 /* 347 * XXX: the top layer is probably not fully populated, so we allocate 348 * too much space for ip->array in here. 349 */ 350 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO); 351 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 352 M_MDSECT, M_WAITOK | M_ZERO); 353 ip->total = NINDIR; 354 ip->shift = layer * nshift; 355 return (ip); 356 } 357 358 /* 359 * Read a given sector 360 */ 361 362 static uintptr_t 363 s_read(struct indir *ip, off_t offset) 364 { 365 struct indir *cip; 366 int idx; 367 uintptr_t up; 368 369 if (md_debug > 1) 370 printf("s_read(%jd)\n", (intmax_t)offset); 371 up = 0; 372 for (cip = ip; cip != NULL;) { 373 if (cip->shift) { 374 idx = (offset >> cip->shift) & NMASK; 375 up = cip->array[idx]; 376 cip = (struct indir *)up; 377 continue; 378 } 379 idx = offset & NMASK; 380 return (cip->array[idx]); 381 } 382 return (0); 383 } 384 385 /* 386 * Write a given sector, prune the tree if the value is 0 387 */ 388 389 static int 390 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 391 { 392 struct indir *cip, *lip[10]; 393 int idx, li; 394 uintptr_t up; 395 396 if (md_debug > 1) 397 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 398 up = 0; 399 li = 0; 400 cip = ip; 401 for (;;) { 402 lip[li++] = cip; 403 if (cip->shift) { 404 idx = (offset >> cip->shift) & NMASK; 405 up = cip->array[idx]; 406 if (up != 0) { 407 cip = (struct indir *)up; 408 continue; 409 } 410 /* Allocate branch */ 411 cip->array[idx] = 412 (uintptr_t)new_indir(cip->shift - nshift); 413 if (cip->array[idx] == 0) 414 return (ENOSPC); 415 cip->used++; 416 up = cip->array[idx]; 417 cip = (struct indir *)up; 418 continue; 419 } 420 /* leafnode */ 421 idx = offset & NMASK; 422 up = cip->array[idx]; 423 if (up != 0) 424 cip->used--; 425 cip->array[idx] = ptr; 426 if (ptr != 0) 427 cip->used++; 428 break; 429 } 430 if (cip->used != 0 || li == 1) 431 return (0); 432 li--; 433 while (cip->used == 0 && cip != ip) { 434 li--; 435 idx = (offset >> lip[li]->shift) & NMASK; 436 up = lip[li]->array[idx]; 437 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 438 del_indir(cip); 439 lip[li]->array[idx] = 0; 440 lip[li]->used--; 441 cip = lip[li]; 442 } 443 return (0); 444 } 445 446 static int 447 g_md_access(struct g_provider *pp, int r, int w, int e) 448 { 449 struct md_s *sc; 450 451 sc = pp->geom->softc; 452 if (sc == NULL) { 453 if (r <= 0 && w <= 0 && e <= 0) 454 return (0); 455 return (ENXIO); 456 } 457 r += pp->acr; 458 w += pp->acw; 459 e += pp->ace; 460 if ((sc->flags & MD_READONLY) != 0 && w > 0) 461 return (EROFS); 462 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 463 sc->opencount = 1; 464 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 465 sc->opencount = 0; 466 } 467 return (0); 468 } 469 470 static void 471 g_md_start(struct bio *bp) 472 { 473 struct md_s *sc; 474 475 sc = bp->bio_to->geom->softc; 476 if ((bp->bio_cmd == BIO_READ) || (bp->bio_cmd == BIO_WRITE)) { 477 devstat_start_transaction_bio(sc->devstat, bp); 478 } 479 mtx_lock(&sc->queue_mtx); 480 bioq_disksort(&sc->bio_queue, bp); 481 wakeup(sc); 482 mtx_unlock(&sc->queue_mtx); 483 } 484 485 #define MD_MALLOC_MOVE_ZERO 1 486 #define MD_MALLOC_MOVE_FILL 2 487 #define MD_MALLOC_MOVE_READ 3 488 #define MD_MALLOC_MOVE_WRITE 4 489 #define MD_MALLOC_MOVE_CMP 5 490 491 static int 492 md_malloc_move_ma(vm_page_t **mp, int *ma_offs, unsigned sectorsize, 493 void *ptr, u_char fill, int op) 494 { 495 struct sf_buf *sf; 496 vm_page_t m, *mp1; 497 char *p, first; 498 off_t *uc; 499 unsigned n; 500 int error, i, ma_offs1, sz, first_read; 501 502 m = NULL; 503 error = 0; 504 sf = NULL; 505 /* if (op == MD_MALLOC_MOVE_CMP) { gcc */ 506 first = 0; 507 first_read = 0; 508 uc = ptr; 509 mp1 = *mp; 510 ma_offs1 = *ma_offs; 511 /* } */ 512 sched_pin(); 513 for (n = sectorsize; n != 0; n -= sz) { 514 sz = imin(PAGE_SIZE - *ma_offs, n); 515 if (m != **mp) { 516 if (sf != NULL) 517 sf_buf_free(sf); 518 m = **mp; 519 sf = sf_buf_alloc(m, SFB_CPUPRIVATE | 520 (md_malloc_wait ? 0 : SFB_NOWAIT)); 521 if (sf == NULL) { 522 error = ENOMEM; 523 break; 524 } 525 } 526 p = (char *)sf_buf_kva(sf) + *ma_offs; 527 switch (op) { 528 case MD_MALLOC_MOVE_ZERO: 529 bzero(p, sz); 530 break; 531 case MD_MALLOC_MOVE_FILL: 532 memset(p, fill, sz); 533 break; 534 case MD_MALLOC_MOVE_READ: 535 bcopy(ptr, p, sz); 536 cpu_flush_dcache(p, sz); 537 break; 538 case MD_MALLOC_MOVE_WRITE: 539 bcopy(p, ptr, sz); 540 break; 541 case MD_MALLOC_MOVE_CMP: 542 for (i = 0; i < sz; i++, p++) { 543 if (!first_read) { 544 *uc = (u_char)*p; 545 first = *p; 546 first_read = 1; 547 } else if (*p != first) { 548 error = EDOOFUS; 549 break; 550 } 551 } 552 break; 553 default: 554 KASSERT(0, ("md_malloc_move_ma unknown op %d\n", op)); 555 break; 556 } 557 if (error != 0) 558 break; 559 *ma_offs += sz; 560 *ma_offs %= PAGE_SIZE; 561 if (*ma_offs == 0) 562 (*mp)++; 563 ptr = (char *)ptr + sz; 564 } 565 566 if (sf != NULL) 567 sf_buf_free(sf); 568 sched_unpin(); 569 if (op == MD_MALLOC_MOVE_CMP && error != 0) { 570 *mp = mp1; 571 *ma_offs = ma_offs1; 572 } 573 return (error); 574 } 575 576 static int 577 md_malloc_move_vlist(bus_dma_segment_t **pvlist, int *pma_offs, 578 unsigned len, void *ptr, u_char fill, int op) 579 { 580 bus_dma_segment_t *vlist; 581 uint8_t *p, *end, first; 582 off_t *uc; 583 int ma_offs, seg_len; 584 585 vlist = *pvlist; 586 ma_offs = *pma_offs; 587 uc = ptr; 588 589 for (; len != 0; len -= seg_len) { 590 seg_len = imin(vlist->ds_len - ma_offs, len); 591 p = (uint8_t *)(uintptr_t)vlist->ds_addr + ma_offs; 592 switch (op) { 593 case MD_MALLOC_MOVE_ZERO: 594 bzero(p, seg_len); 595 break; 596 case MD_MALLOC_MOVE_FILL: 597 memset(p, fill, seg_len); 598 break; 599 case MD_MALLOC_MOVE_READ: 600 bcopy(ptr, p, seg_len); 601 cpu_flush_dcache(p, seg_len); 602 break; 603 case MD_MALLOC_MOVE_WRITE: 604 bcopy(p, ptr, seg_len); 605 break; 606 case MD_MALLOC_MOVE_CMP: 607 end = p + seg_len; 608 first = *uc = *p; 609 /* Confirm all following bytes match the first */ 610 while (++p < end) { 611 if (*p != first) 612 return (EDOOFUS); 613 } 614 break; 615 default: 616 KASSERT(0, ("md_malloc_move_vlist unknown op %d\n", op)); 617 break; 618 } 619 620 ma_offs += seg_len; 621 if (ma_offs == vlist->ds_len) { 622 ma_offs = 0; 623 vlist++; 624 } 625 ptr = (uint8_t *)ptr + seg_len; 626 } 627 *pvlist = vlist; 628 *pma_offs = ma_offs; 629 630 return (0); 631 } 632 633 static int 634 mdstart_malloc(struct md_s *sc, struct bio *bp) 635 { 636 u_char *dst; 637 vm_page_t *m; 638 bus_dma_segment_t *vlist; 639 int i, error, error1, ma_offs, notmapped; 640 off_t secno, nsec, uc; 641 uintptr_t sp, osp; 642 643 switch (bp->bio_cmd) { 644 case BIO_READ: 645 case BIO_WRITE: 646 case BIO_DELETE: 647 break; 648 default: 649 return (EOPNOTSUPP); 650 } 651 652 notmapped = (bp->bio_flags & BIO_UNMAPPED) != 0; 653 vlist = (bp->bio_flags & BIO_VLIST) != 0 ? 654 (bus_dma_segment_t *)bp->bio_data : NULL; 655 if (notmapped) { 656 m = bp->bio_ma; 657 ma_offs = bp->bio_ma_offset; 658 dst = NULL; 659 KASSERT(vlist == NULL, ("vlists cannot be unmapped")); 660 } else if (vlist != NULL) { 661 ma_offs = bp->bio_ma_offset; 662 dst = NULL; 663 } else { 664 dst = bp->bio_data; 665 } 666 667 nsec = bp->bio_length / sc->sectorsize; 668 secno = bp->bio_offset / sc->sectorsize; 669 error = 0; 670 while (nsec--) { 671 osp = s_read(sc->indir, secno); 672 if (bp->bio_cmd == BIO_DELETE) { 673 if (osp != 0) 674 error = s_write(sc->indir, secno, 0); 675 } else if (bp->bio_cmd == BIO_READ) { 676 if (osp == 0) { 677 if (notmapped) { 678 error = md_malloc_move_ma(&m, &ma_offs, 679 sc->sectorsize, NULL, 0, 680 MD_MALLOC_MOVE_ZERO); 681 } else if (vlist != NULL) { 682 error = md_malloc_move_vlist(&vlist, 683 &ma_offs, sc->sectorsize, NULL, 0, 684 MD_MALLOC_MOVE_ZERO); 685 } else 686 bzero(dst, sc->sectorsize); 687 } else if (osp <= 255) { 688 if (notmapped) { 689 error = md_malloc_move_ma(&m, &ma_offs, 690 sc->sectorsize, NULL, osp, 691 MD_MALLOC_MOVE_FILL); 692 } else if (vlist != NULL) { 693 error = md_malloc_move_vlist(&vlist, 694 &ma_offs, sc->sectorsize, NULL, osp, 695 MD_MALLOC_MOVE_FILL); 696 } else 697 memset(dst, osp, sc->sectorsize); 698 } else { 699 if (notmapped) { 700 error = md_malloc_move_ma(&m, &ma_offs, 701 sc->sectorsize, (void *)osp, 0, 702 MD_MALLOC_MOVE_READ); 703 } else if (vlist != NULL) { 704 error = md_malloc_move_vlist(&vlist, 705 &ma_offs, sc->sectorsize, 706 (void *)osp, 0, 707 MD_MALLOC_MOVE_READ); 708 } else { 709 bcopy((void *)osp, dst, sc->sectorsize); 710 cpu_flush_dcache(dst, sc->sectorsize); 711 } 712 } 713 osp = 0; 714 } else if (bp->bio_cmd == BIO_WRITE) { 715 if (sc->flags & MD_COMPRESS) { 716 if (notmapped) { 717 error1 = md_malloc_move_ma(&m, &ma_offs, 718 sc->sectorsize, &uc, 0, 719 MD_MALLOC_MOVE_CMP); 720 i = error1 == 0 ? sc->sectorsize : 0; 721 } else if (vlist != NULL) { 722 error1 = md_malloc_move_vlist(&vlist, 723 &ma_offs, sc->sectorsize, &uc, 0, 724 MD_MALLOC_MOVE_CMP); 725 i = error1 == 0 ? sc->sectorsize : 0; 726 } else { 727 uc = dst[0]; 728 for (i = 1; i < sc->sectorsize; i++) { 729 if (dst[i] != uc) 730 break; 731 } 732 } 733 } else { 734 i = 0; 735 uc = 0; 736 } 737 if (i == sc->sectorsize) { 738 if (osp != uc) 739 error = s_write(sc->indir, secno, uc); 740 } else { 741 if (osp <= 255) { 742 sp = (uintptr_t)uma_zalloc(sc->uma, 743 md_malloc_wait ? M_WAITOK : 744 M_NOWAIT); 745 if (sp == 0) { 746 error = ENOSPC; 747 break; 748 } 749 if (notmapped) { 750 error = md_malloc_move_ma(&m, 751 &ma_offs, sc->sectorsize, 752 (void *)sp, 0, 753 MD_MALLOC_MOVE_WRITE); 754 } else if (vlist != NULL) { 755 error = md_malloc_move_vlist( 756 &vlist, &ma_offs, 757 sc->sectorsize, (void *)sp, 758 0, MD_MALLOC_MOVE_WRITE); 759 } else { 760 bcopy(dst, (void *)sp, 761 sc->sectorsize); 762 } 763 error = s_write(sc->indir, secno, sp); 764 } else { 765 if (notmapped) { 766 error = md_malloc_move_ma(&m, 767 &ma_offs, sc->sectorsize, 768 (void *)osp, 0, 769 MD_MALLOC_MOVE_WRITE); 770 } else if (vlist != NULL) { 771 error = md_malloc_move_vlist( 772 &vlist, &ma_offs, 773 sc->sectorsize, (void *)osp, 774 0, MD_MALLOC_MOVE_WRITE); 775 } else { 776 bcopy(dst, (void *)osp, 777 sc->sectorsize); 778 } 779 osp = 0; 780 } 781 } 782 } else { 783 error = EOPNOTSUPP; 784 } 785 if (osp > 255) 786 uma_zfree(sc->uma, (void*)osp); 787 if (error != 0) 788 break; 789 secno++; 790 if (!notmapped && vlist == NULL) 791 dst += sc->sectorsize; 792 } 793 bp->bio_resid = 0; 794 return (error); 795 } 796 797 static void 798 mdcopyto_vlist(void *src, bus_dma_segment_t *vlist, off_t offset, off_t len) 799 { 800 off_t seg_len; 801 802 while (offset >= vlist->ds_len) { 803 offset -= vlist->ds_len; 804 vlist++; 805 } 806 807 while (len != 0) { 808 seg_len = omin(len, vlist->ds_len - offset); 809 bcopy(src, (void *)(uintptr_t)(vlist->ds_addr + offset), 810 seg_len); 811 offset = 0; 812 src = (uint8_t *)src + seg_len; 813 len -= seg_len; 814 vlist++; 815 } 816 } 817 818 static void 819 mdcopyfrom_vlist(bus_dma_segment_t *vlist, off_t offset, void *dst, off_t len) 820 { 821 off_t seg_len; 822 823 while (offset >= vlist->ds_len) { 824 offset -= vlist->ds_len; 825 vlist++; 826 } 827 828 while (len != 0) { 829 seg_len = omin(len, vlist->ds_len - offset); 830 bcopy((void *)(uintptr_t)(vlist->ds_addr + offset), dst, 831 seg_len); 832 offset = 0; 833 dst = (uint8_t *)dst + seg_len; 834 len -= seg_len; 835 vlist++; 836 } 837 } 838 839 static int 840 mdstart_preload(struct md_s *sc, struct bio *bp) 841 { 842 uint8_t *p; 843 844 p = sc->pl_ptr + bp->bio_offset; 845 switch (bp->bio_cmd) { 846 case BIO_READ: 847 if ((bp->bio_flags & BIO_VLIST) != 0) { 848 mdcopyto_vlist(p, (bus_dma_segment_t *)bp->bio_data, 849 bp->bio_ma_offset, bp->bio_length); 850 } else { 851 bcopy(p, bp->bio_data, bp->bio_length); 852 } 853 cpu_flush_dcache(bp->bio_data, bp->bio_length); 854 break; 855 case BIO_WRITE: 856 if ((bp->bio_flags & BIO_VLIST) != 0) { 857 mdcopyfrom_vlist((bus_dma_segment_t *)bp->bio_data, 858 bp->bio_ma_offset, p, bp->bio_length); 859 } else { 860 bcopy(bp->bio_data, p, bp->bio_length); 861 } 862 break; 863 } 864 bp->bio_resid = 0; 865 return (0); 866 } 867 868 static int 869 mdstart_vnode(struct md_s *sc, struct bio *bp) 870 { 871 int error; 872 struct uio auio; 873 struct iovec aiov; 874 struct iovec *piov; 875 struct mount *mp; 876 struct vnode *vp; 877 struct buf *pb; 878 bus_dma_segment_t *vlist; 879 struct thread *td; 880 off_t iolen, iostart, len, zerosize; 881 int ma_offs, npages; 882 883 switch (bp->bio_cmd) { 884 case BIO_READ: 885 auio.uio_rw = UIO_READ; 886 break; 887 case BIO_WRITE: 888 case BIO_DELETE: 889 auio.uio_rw = UIO_WRITE; 890 break; 891 case BIO_FLUSH: 892 break; 893 default: 894 return (EOPNOTSUPP); 895 } 896 897 td = curthread; 898 vp = sc->vnode; 899 pb = NULL; 900 piov = NULL; 901 ma_offs = bp->bio_ma_offset; 902 len = bp->bio_length; 903 904 /* 905 * VNODE I/O 906 * 907 * If an error occurs, we set BIO_ERROR but we do not set 908 * B_INVAL because (for a write anyway), the buffer is 909 * still valid. 910 */ 911 912 if (bp->bio_cmd == BIO_FLUSH) { 913 (void) vn_start_write(vp, &mp, V_WAIT); 914 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 915 error = VOP_FSYNC(vp, MNT_WAIT, td); 916 VOP_UNLOCK(vp); 917 vn_finished_write(mp); 918 return (error); 919 } 920 921 auio.uio_offset = (vm_ooffset_t)bp->bio_offset; 922 auio.uio_resid = bp->bio_length; 923 auio.uio_segflg = UIO_SYSSPACE; 924 auio.uio_td = td; 925 926 if (bp->bio_cmd == BIO_DELETE) { 927 /* 928 * Emulate BIO_DELETE by writing zeros. 929 */ 930 zerosize = ZERO_REGION_SIZE - 931 (ZERO_REGION_SIZE % sc->sectorsize); 932 auio.uio_iovcnt = howmany(bp->bio_length, zerosize); 933 piov = malloc(sizeof(*piov) * auio.uio_iovcnt, M_MD, M_WAITOK); 934 auio.uio_iov = piov; 935 while (len > 0) { 936 piov->iov_base = __DECONST(void *, zero_region); 937 piov->iov_len = len; 938 if (len > zerosize) 939 piov->iov_len = zerosize; 940 len -= piov->iov_len; 941 piov++; 942 } 943 piov = auio.uio_iov; 944 } else if ((bp->bio_flags & BIO_VLIST) != 0) { 945 piov = malloc(sizeof(*piov) * bp->bio_ma_n, M_MD, M_WAITOK); 946 auio.uio_iov = piov; 947 vlist = (bus_dma_segment_t *)bp->bio_data; 948 while (len > 0) { 949 piov->iov_base = (void *)(uintptr_t)(vlist->ds_addr + 950 ma_offs); 951 piov->iov_len = vlist->ds_len - ma_offs; 952 if (piov->iov_len > len) 953 piov->iov_len = len; 954 len -= piov->iov_len; 955 ma_offs = 0; 956 vlist++; 957 piov++; 958 } 959 auio.uio_iovcnt = piov - auio.uio_iov; 960 piov = auio.uio_iov; 961 } else if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 962 pb = uma_zalloc(md_pbuf_zone, M_WAITOK); 963 MPASS((pb->b_flags & B_MAXPHYS) != 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 pmap_qenter((vm_offset_t)pb->b_data, 971 &bp->bio_ma[atop(ma_offs)], npages); 972 aiov.iov_base = (void *)((vm_offset_t)pb->b_data + 973 (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 } else { 979 aiov.iov_base = bp->bio_data; 980 aiov.iov_len = bp->bio_length; 981 auio.uio_iov = &aiov; 982 auio.uio_iovcnt = 1; 983 } 984 iostart = auio.uio_offset; 985 if (auio.uio_rw == UIO_READ) { 986 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 987 error = VOP_READ(vp, &auio, 0, sc->cred); 988 VOP_UNLOCK(vp); 989 } else { 990 (void) vn_start_write(vp, &mp, V_WAIT); 991 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 992 error = VOP_WRITE(vp, &auio, sc->flags & MD_ASYNC ? 0 : IO_SYNC, 993 sc->cred); 994 VOP_UNLOCK(vp); 995 vn_finished_write(mp); 996 if (error == 0) 997 sc->flags &= ~MD_VERIFY; 998 } 999 1000 /* When MD_CACHE is set, try to avoid double-caching the data. */ 1001 if (error == 0 && (sc->flags & MD_CACHE) == 0) 1002 VOP_ADVISE(vp, iostart, auio.uio_offset - 1, 1003 POSIX_FADV_DONTNEED); 1004 1005 if (pb != NULL) { 1006 pmap_qremove((vm_offset_t)pb->b_data, npages); 1007 if (error == 0) { 1008 len -= iolen; 1009 bp->bio_resid -= iolen; 1010 ma_offs += iolen; 1011 if (len > 0) 1012 goto unmapped_step; 1013 } 1014 uma_zfree(md_pbuf_zone, pb); 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 default: 1038 return (EOPNOTSUPP); 1039 } 1040 1041 p = bp->bio_data; 1042 ma_offs = (bp->bio_flags & (BIO_UNMAPPED|BIO_VLIST)) != 0 ? 1043 bp->bio_ma_offset : 0; 1044 vlist = (bp->bio_flags & BIO_VLIST) != 0 ? 1045 (bus_dma_segment_t *)bp->bio_data : NULL; 1046 1047 /* 1048 * offs is the offset at which to start operating on the 1049 * next (ie, first) page. lastp is the last page on 1050 * which we're going to operate. lastend is the ending 1051 * position within that last page (ie, PAGE_SIZE if 1052 * we're operating on complete aligned pages). 1053 */ 1054 offs = bp->bio_offset % PAGE_SIZE; 1055 lastp = (bp->bio_offset + bp->bio_length - 1) / PAGE_SIZE; 1056 lastend = (bp->bio_offset + bp->bio_length - 1) % PAGE_SIZE + 1; 1057 1058 rv = VM_PAGER_OK; 1059 vm_object_pip_add(sc->object, 1); 1060 for (i = bp->bio_offset / PAGE_SIZE; i <= lastp; i++) { 1061 len = ((i == lastp) ? lastend : PAGE_SIZE) - offs; 1062 m = vm_page_grab_unlocked(sc->object, i, VM_ALLOC_SYSTEM); 1063 if (bp->bio_cmd == BIO_READ) { 1064 if (vm_page_all_valid(m)) 1065 rv = VM_PAGER_OK; 1066 else 1067 rv = vm_pager_get_pages(sc->object, &m, 1, 1068 NULL, NULL); 1069 if (rv == VM_PAGER_ERROR) { 1070 VM_OBJECT_WLOCK(sc->object); 1071 vm_page_free(m); 1072 VM_OBJECT_WUNLOCK(sc->object); 1073 break; 1074 } else if (rv == VM_PAGER_FAIL) { 1075 /* 1076 * Pager does not have the page. Zero 1077 * the allocated page, and mark it as 1078 * valid. Do not set dirty, the page 1079 * can be recreated if thrown out. 1080 */ 1081 pmap_zero_page(m); 1082 vm_page_valid(m); 1083 } 1084 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 1085 pmap_copy_pages(&m, offs, bp->bio_ma, 1086 ma_offs, len); 1087 } else if ((bp->bio_flags & BIO_VLIST) != 0) { 1088 physcopyout_vlist(VM_PAGE_TO_PHYS(m) + offs, 1089 vlist, ma_offs, len); 1090 cpu_flush_dcache(p, len); 1091 } else { 1092 physcopyout(VM_PAGE_TO_PHYS(m) + offs, p, len); 1093 cpu_flush_dcache(p, len); 1094 } 1095 } else if (bp->bio_cmd == BIO_WRITE) { 1096 if (len == PAGE_SIZE || vm_page_all_valid(m)) 1097 rv = VM_PAGER_OK; 1098 else 1099 rv = vm_pager_get_pages(sc->object, &m, 1, 1100 NULL, NULL); 1101 if (rv == VM_PAGER_ERROR) { 1102 VM_OBJECT_WLOCK(sc->object); 1103 vm_page_free(m); 1104 VM_OBJECT_WUNLOCK(sc->object); 1105 break; 1106 } else if (rv == VM_PAGER_FAIL) 1107 pmap_zero_page(m); 1108 1109 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 1110 pmap_copy_pages(bp->bio_ma, ma_offs, &m, 1111 offs, len); 1112 } else if ((bp->bio_flags & BIO_VLIST) != 0) { 1113 physcopyin_vlist(vlist, ma_offs, 1114 VM_PAGE_TO_PHYS(m) + offs, len); 1115 } else { 1116 physcopyin(p, VM_PAGE_TO_PHYS(m) + offs, len); 1117 } 1118 1119 vm_page_valid(m); 1120 vm_page_set_dirty(m); 1121 } else if (bp->bio_cmd == BIO_DELETE) { 1122 if (len == PAGE_SIZE || vm_page_all_valid(m)) 1123 rv = VM_PAGER_OK; 1124 else 1125 rv = vm_pager_get_pages(sc->object, &m, 1, 1126 NULL, NULL); 1127 VM_OBJECT_WLOCK(sc->object); 1128 if (rv == VM_PAGER_ERROR) { 1129 vm_page_free(m); 1130 VM_OBJECT_WUNLOCK(sc->object); 1131 break; 1132 } else if (rv == VM_PAGER_FAIL) { 1133 vm_page_free(m); 1134 m = NULL; 1135 } else { 1136 /* Page is valid. */ 1137 if (len != PAGE_SIZE) { 1138 pmap_zero_page_area(m, offs, len); 1139 vm_page_set_dirty(m); 1140 } else { 1141 vm_pager_page_unswapped(m); 1142 vm_page_free(m); 1143 m = NULL; 1144 } 1145 } 1146 VM_OBJECT_WUNLOCK(sc->object); 1147 } 1148 if (m != NULL) { 1149 /* 1150 * The page may be deactivated prior to setting 1151 * PGA_REFERENCED, but in this case it will be 1152 * reactivated by the page daemon. 1153 */ 1154 if (vm_page_active(m)) 1155 vm_page_reference(m); 1156 else 1157 vm_page_activate(m); 1158 vm_page_xunbusy(m); 1159 } 1160 1161 /* Actions on further pages start at offset 0 */ 1162 p += PAGE_SIZE - offs; 1163 offs = 0; 1164 ma_offs += len; 1165 } 1166 vm_object_pip_wakeup(sc->object); 1167 return (rv != VM_PAGER_ERROR ? 0 : ENOSPC); 1168 } 1169 1170 static int 1171 mdstart_null(struct md_s *sc, struct bio *bp) 1172 { 1173 1174 switch (bp->bio_cmd) { 1175 case BIO_READ: 1176 bzero(bp->bio_data, bp->bio_length); 1177 cpu_flush_dcache(bp->bio_data, bp->bio_length); 1178 break; 1179 case BIO_WRITE: 1180 break; 1181 } 1182 bp->bio_resid = 0; 1183 return (0); 1184 } 1185 1186 static void 1187 md_handleattr(struct md_s *sc, struct bio *bp) 1188 { 1189 if (sc->fwsectors && sc->fwheads && 1190 (g_handleattr_int(bp, "GEOM::fwsectors", sc->fwsectors) != 0 || 1191 g_handleattr_int(bp, "GEOM::fwheads", sc->fwheads) != 0)) 1192 return; 1193 if (g_handleattr_int(bp, "GEOM::candelete", 1) != 0) 1194 return; 1195 if (sc->ident[0] != '\0' && 1196 g_handleattr_str(bp, "GEOM::ident", sc->ident) != 0) 1197 return; 1198 if (g_handleattr_int(bp, "MNT::verified", (sc->flags & MD_VERIFY) != 0)) 1199 return; 1200 g_io_deliver(bp, EOPNOTSUPP); 1201 } 1202 1203 static void 1204 md_kthread(void *arg) 1205 { 1206 struct md_s *sc; 1207 struct bio *bp; 1208 int error; 1209 1210 sc = arg; 1211 thread_lock(curthread); 1212 sched_prio(curthread, PRIBIO); 1213 thread_unlock(curthread); 1214 if (sc->type == MD_VNODE) 1215 curthread->td_pflags |= TDP_NORUNNINGBUF; 1216 1217 for (;;) { 1218 mtx_lock(&sc->queue_mtx); 1219 if (sc->flags & MD_SHUTDOWN) { 1220 sc->flags |= MD_EXITING; 1221 mtx_unlock(&sc->queue_mtx); 1222 kproc_exit(0); 1223 } 1224 bp = bioq_takefirst(&sc->bio_queue); 1225 if (!bp) { 1226 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 1227 continue; 1228 } 1229 mtx_unlock(&sc->queue_mtx); 1230 if (bp->bio_cmd == BIO_GETATTR) { 1231 md_handleattr(sc, bp); 1232 } else { 1233 error = sc->start(sc, bp); 1234 if (bp->bio_cmd == BIO_READ || bp->bio_cmd == BIO_WRITE) { 1235 /* 1236 * Devstat uses (bio_bcount, bio_resid) for 1237 * determining the length of the completed part 1238 * of the i/o. g_io_deliver() will translate 1239 * from bio_completed to that, but it also 1240 * destroys the bio so we must do our own 1241 * translation. 1242 */ 1243 bp->bio_bcount = bp->bio_length; 1244 devstat_end_transaction_bio(sc->devstat, bp); 1245 } 1246 bp->bio_completed = bp->bio_length - bp->bio_resid; 1247 g_io_deliver(bp, error); 1248 } 1249 } 1250 } 1251 1252 static struct md_s * 1253 mdfind(int unit) 1254 { 1255 struct md_s *sc; 1256 1257 LIST_FOREACH(sc, &md_softc_list, list) { 1258 if (sc->unit == unit) 1259 break; 1260 } 1261 return (sc); 1262 } 1263 1264 static struct md_s * 1265 mdnew(int unit, int *errp, enum md_types type) 1266 { 1267 struct md_s *sc; 1268 int error; 1269 1270 *errp = 0; 1271 if (unit == -1) 1272 unit = alloc_unr(md_uh); 1273 else 1274 unit = alloc_unr_specific(md_uh, unit); 1275 1276 if (unit == -1) { 1277 *errp = EBUSY; 1278 return (NULL); 1279 } 1280 1281 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 1282 sc->type = type; 1283 bioq_init(&sc->bio_queue); 1284 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 1285 sc->unit = unit; 1286 sprintf(sc->name, "md%d", unit); 1287 LIST_INSERT_HEAD(&md_softc_list, sc, list); 1288 error = kproc_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 1289 if (error == 0) 1290 return (sc); 1291 LIST_REMOVE(sc, list); 1292 mtx_destroy(&sc->queue_mtx); 1293 free_unr(md_uh, sc->unit); 1294 free(sc, M_MD); 1295 *errp = error; 1296 return (NULL); 1297 } 1298 1299 static void 1300 mdinit(struct md_s *sc) 1301 { 1302 struct g_geom *gp; 1303 struct g_provider *pp; 1304 1305 g_topology_lock(); 1306 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 1307 gp->softc = sc; 1308 pp = g_new_providerf(gp, "md%d", sc->unit); 1309 devstat_remove_entry(pp->stat); 1310 pp->stat = NULL; 1311 pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE; 1312 pp->mediasize = sc->mediasize; 1313 pp->sectorsize = sc->sectorsize; 1314 switch (sc->type) { 1315 case MD_MALLOC: 1316 case MD_VNODE: 1317 case MD_SWAP: 1318 pp->flags |= G_PF_ACCEPT_UNMAPPED; 1319 break; 1320 case MD_PRELOAD: 1321 case MD_NULL: 1322 break; 1323 } 1324 sc->gp = gp; 1325 sc->pp = pp; 1326 sc->devstat = devstat_new_entry("md", sc->unit, sc->sectorsize, 1327 DEVSTAT_ALL_SUPPORTED, DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 1328 sc->devstat->id = pp; 1329 g_error_provider(pp, 0); 1330 g_topology_unlock(); 1331 } 1332 1333 static int 1334 mdcreate_malloc(struct md_s *sc, struct md_req *mdr) 1335 { 1336 uintptr_t sp; 1337 int error; 1338 off_t u; 1339 1340 error = 0; 1341 if (mdr->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 1342 return (EINVAL); 1343 if (mdr->md_sectorsize != 0 && !powerof2(mdr->md_sectorsize)) 1344 return (EINVAL); 1345 /* Compression doesn't make sense if we have reserved space */ 1346 if (mdr->md_options & MD_RESERVE) 1347 mdr->md_options &= ~MD_COMPRESS; 1348 if (mdr->md_fwsectors != 0) 1349 sc->fwsectors = mdr->md_fwsectors; 1350 if (mdr->md_fwheads != 0) 1351 sc->fwheads = mdr->md_fwheads; 1352 sc->flags = mdr->md_options & (MD_COMPRESS | MD_FORCE); 1353 sc->indir = dimension(sc->mediasize / sc->sectorsize); 1354 sc->uma = uma_zcreate(sc->name, sc->sectorsize, NULL, NULL, NULL, NULL, 1355 0x1ff, 0); 1356 if (mdr->md_options & MD_RESERVE) { 1357 off_t nsectors; 1358 1359 nsectors = sc->mediasize / sc->sectorsize; 1360 for (u = 0; u < nsectors; u++) { 1361 sp = (uintptr_t)uma_zalloc(sc->uma, (md_malloc_wait ? 1362 M_WAITOK : M_NOWAIT) | M_ZERO); 1363 if (sp != 0) 1364 error = s_write(sc->indir, u, sp); 1365 else 1366 error = ENOMEM; 1367 if (error != 0) 1368 break; 1369 } 1370 } 1371 return (error); 1372 } 1373 1374 static int 1375 mdsetcred(struct md_s *sc, struct ucred *cred) 1376 { 1377 char *tmpbuf; 1378 int error = 0; 1379 1380 /* 1381 * Set credits in our softc 1382 */ 1383 1384 if (sc->cred) 1385 crfree(sc->cred); 1386 sc->cred = crhold(cred); 1387 1388 /* 1389 * Horrible kludge to establish credentials for NFS XXX. 1390 */ 1391 1392 if (sc->vnode) { 1393 struct uio auio; 1394 struct iovec aiov; 1395 1396 tmpbuf = malloc(sc->sectorsize, M_TEMP, M_WAITOK); 1397 bzero(&auio, sizeof(auio)); 1398 1399 aiov.iov_base = tmpbuf; 1400 aiov.iov_len = sc->sectorsize; 1401 auio.uio_iov = &aiov; 1402 auio.uio_iovcnt = 1; 1403 auio.uio_offset = 0; 1404 auio.uio_rw = UIO_READ; 1405 auio.uio_segflg = UIO_SYSSPACE; 1406 auio.uio_resid = aiov.iov_len; 1407 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY); 1408 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 1409 VOP_UNLOCK(sc->vnode); 1410 free(tmpbuf, M_TEMP); 1411 } 1412 return (error); 1413 } 1414 1415 static int 1416 mdcreate_vnode(struct md_s *sc, struct md_req *mdr, struct thread *td) 1417 { 1418 struct vattr vattr; 1419 struct nameidata nd; 1420 char *fname; 1421 int error, flags; 1422 1423 fname = mdr->md_file; 1424 if (mdr->md_file_seg == UIO_USERSPACE) { 1425 error = copyinstr(fname, sc->file, sizeof(sc->file), NULL); 1426 if (error != 0) 1427 return (error); 1428 } else if (mdr->md_file_seg == UIO_SYSSPACE) 1429 strlcpy(sc->file, fname, sizeof(sc->file)); 1430 else 1431 return (EDOOFUS); 1432 1433 /* 1434 * If the user specified that this is a read only device, don't 1435 * set the FWRITE mask before trying to open the backing store. 1436 */ 1437 flags = FREAD | ((mdr->md_options & MD_READONLY) ? 0 : FWRITE) \ 1438 | ((mdr->md_options & MD_VERIFY) ? O_VERIFY : 0); 1439 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, sc->file, td); 1440 error = vn_open(&nd, &flags, 0, NULL); 1441 if (error != 0) 1442 return (error); 1443 NDFREE(&nd, NDF_ONLY_PNBUF); 1444 if (nd.ni_vp->v_type != VREG) { 1445 error = EINVAL; 1446 goto bad; 1447 } 1448 error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred); 1449 if (error != 0) 1450 goto bad; 1451 if (VOP_ISLOCKED(nd.ni_vp) != LK_EXCLUSIVE) { 1452 vn_lock(nd.ni_vp, LK_UPGRADE | LK_RETRY); 1453 if (VN_IS_DOOMED(nd.ni_vp)) { 1454 /* Forced unmount. */ 1455 error = EBADF; 1456 goto bad; 1457 } 1458 } 1459 nd.ni_vp->v_vflag |= VV_MD; 1460 VOP_UNLOCK(nd.ni_vp); 1461 1462 if (mdr->md_fwsectors != 0) 1463 sc->fwsectors = mdr->md_fwsectors; 1464 if (mdr->md_fwheads != 0) 1465 sc->fwheads = mdr->md_fwheads; 1466 snprintf(sc->ident, sizeof(sc->ident), "MD-DEV%ju-INO%ju", 1467 (uintmax_t)vattr.va_fsid, (uintmax_t)vattr.va_fileid); 1468 sc->flags = mdr->md_options & (MD_ASYNC | MD_CACHE | MD_FORCE | 1469 MD_VERIFY); 1470 if (!(flags & FWRITE)) 1471 sc->flags |= MD_READONLY; 1472 sc->vnode = nd.ni_vp; 1473 1474 error = mdsetcred(sc, td->td_ucred); 1475 if (error != 0) { 1476 sc->vnode = NULL; 1477 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY); 1478 nd.ni_vp->v_vflag &= ~VV_MD; 1479 goto bad; 1480 } 1481 return (0); 1482 bad: 1483 VOP_UNLOCK(nd.ni_vp); 1484 (void)vn_close(nd.ni_vp, flags, td->td_ucred, td); 1485 return (error); 1486 } 1487 1488 static void 1489 g_md_providergone(struct g_provider *pp) 1490 { 1491 struct md_s *sc = pp->geom->softc; 1492 1493 mtx_lock(&sc->queue_mtx); 1494 sc->flags |= MD_PROVIDERGONE; 1495 wakeup(&sc->flags); 1496 mtx_unlock(&sc->queue_mtx); 1497 } 1498 1499 static int 1500 mddestroy(struct md_s *sc, struct thread *td) 1501 { 1502 1503 if (sc->gp) { 1504 g_topology_lock(); 1505 g_wither_geom(sc->gp, ENXIO); 1506 g_topology_unlock(); 1507 1508 mtx_lock(&sc->queue_mtx); 1509 while (!(sc->flags & MD_PROVIDERGONE)) 1510 msleep(&sc->flags, &sc->queue_mtx, PRIBIO, "mddestroy", 0); 1511 mtx_unlock(&sc->queue_mtx); 1512 } 1513 if (sc->devstat) { 1514 devstat_remove_entry(sc->devstat); 1515 sc->devstat = NULL; 1516 } 1517 mtx_lock(&sc->queue_mtx); 1518 sc->flags |= MD_SHUTDOWN; 1519 wakeup(sc); 1520 while (!(sc->flags & MD_EXITING)) 1521 msleep(sc->procp, &sc->queue_mtx, PRIBIO, "mddestroy", hz / 10); 1522 mtx_unlock(&sc->queue_mtx); 1523 mtx_destroy(&sc->queue_mtx); 1524 if (sc->vnode != NULL) { 1525 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY); 1526 sc->vnode->v_vflag &= ~VV_MD; 1527 VOP_UNLOCK(sc->vnode); 1528 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 1529 FREAD : (FREAD|FWRITE), sc->cred, td); 1530 } 1531 if (sc->cred != NULL) 1532 crfree(sc->cred); 1533 if (sc->object != NULL) 1534 vm_object_deallocate(sc->object); 1535 if (sc->indir) 1536 destroy_indir(sc, sc->indir); 1537 if (sc->uma) 1538 uma_zdestroy(sc->uma); 1539 1540 LIST_REMOVE(sc, list); 1541 free_unr(md_uh, sc->unit); 1542 free(sc, M_MD); 1543 return (0); 1544 } 1545 1546 static int 1547 mdresize(struct md_s *sc, struct md_req *mdr) 1548 { 1549 int error, res; 1550 vm_pindex_t oldpages, newpages; 1551 1552 switch (sc->type) { 1553 case MD_VNODE: 1554 case MD_NULL: 1555 break; 1556 case MD_SWAP: 1557 if (mdr->md_mediasize <= 0 || 1558 (mdr->md_mediasize % PAGE_SIZE) != 0) 1559 return (EDOM); 1560 oldpages = OFF_TO_IDX(sc->mediasize); 1561 newpages = OFF_TO_IDX(mdr->md_mediasize); 1562 if (newpages < oldpages) { 1563 VM_OBJECT_WLOCK(sc->object); 1564 vm_object_page_remove(sc->object, newpages, 0, 0); 1565 swap_release_by_cred(IDX_TO_OFF(oldpages - 1566 newpages), sc->cred); 1567 sc->object->charge = IDX_TO_OFF(newpages); 1568 sc->object->size = newpages; 1569 VM_OBJECT_WUNLOCK(sc->object); 1570 } else if (newpages > oldpages) { 1571 res = swap_reserve_by_cred(IDX_TO_OFF(newpages - 1572 oldpages), sc->cred); 1573 if (!res) 1574 return (ENOMEM); 1575 if ((mdr->md_options & MD_RESERVE) || 1576 (sc->flags & MD_RESERVE)) { 1577 error = swap_pager_reserve(sc->object, 1578 oldpages, newpages - oldpages); 1579 if (error < 0) { 1580 swap_release_by_cred( 1581 IDX_TO_OFF(newpages - oldpages), 1582 sc->cred); 1583 return (EDOM); 1584 } 1585 } 1586 VM_OBJECT_WLOCK(sc->object); 1587 sc->object->charge = IDX_TO_OFF(newpages); 1588 sc->object->size = newpages; 1589 VM_OBJECT_WUNLOCK(sc->object); 1590 } 1591 break; 1592 default: 1593 return (EOPNOTSUPP); 1594 } 1595 1596 sc->mediasize = mdr->md_mediasize; 1597 g_topology_lock(); 1598 g_resize_provider(sc->pp, sc->mediasize); 1599 g_topology_unlock(); 1600 return (0); 1601 } 1602 1603 static int 1604 mdcreate_swap(struct md_s *sc, struct md_req *mdr, struct thread *td) 1605 { 1606 vm_ooffset_t npage; 1607 int error; 1608 1609 /* 1610 * Range check. Disallow negative sizes and sizes not being 1611 * multiple of page size. 1612 */ 1613 if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0) 1614 return (EDOM); 1615 1616 /* 1617 * Allocate an OBJT_SWAP object. 1618 * 1619 * Note the truncation. 1620 */ 1621 1622 if ((mdr->md_options & MD_VERIFY) != 0) 1623 return (EINVAL); 1624 npage = mdr->md_mediasize / PAGE_SIZE; 1625 if (mdr->md_fwsectors != 0) 1626 sc->fwsectors = mdr->md_fwsectors; 1627 if (mdr->md_fwheads != 0) 1628 sc->fwheads = mdr->md_fwheads; 1629 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * npage, 1630 VM_PROT_DEFAULT, 0, td->td_ucred); 1631 if (sc->object == NULL) 1632 return (ENOMEM); 1633 sc->flags = mdr->md_options & (MD_FORCE | MD_RESERVE); 1634 if (mdr->md_options & MD_RESERVE) { 1635 if (swap_pager_reserve(sc->object, 0, npage) < 0) { 1636 error = EDOM; 1637 goto finish; 1638 } 1639 } 1640 error = mdsetcred(sc, td->td_ucred); 1641 finish: 1642 if (error != 0) { 1643 vm_object_deallocate(sc->object); 1644 sc->object = NULL; 1645 } 1646 return (error); 1647 } 1648 1649 static int 1650 mdcreate_null(struct md_s *sc, struct md_req *mdr, struct thread *td) 1651 { 1652 1653 /* 1654 * Range check. Disallow negative sizes and sizes not being 1655 * multiple of page size. 1656 */ 1657 if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0) 1658 return (EDOM); 1659 1660 return (0); 1661 } 1662 1663 static int 1664 kern_mdattach_locked(struct thread *td, struct md_req *mdr) 1665 { 1666 struct md_s *sc; 1667 unsigned sectsize; 1668 int error, i; 1669 1670 sx_assert(&md_sx, SA_XLOCKED); 1671 1672 switch (mdr->md_type) { 1673 case MD_MALLOC: 1674 case MD_PRELOAD: 1675 case MD_VNODE: 1676 case MD_SWAP: 1677 case MD_NULL: 1678 break; 1679 default: 1680 return (EINVAL); 1681 } 1682 if (mdr->md_sectorsize == 0) 1683 sectsize = DEV_BSIZE; 1684 else 1685 sectsize = mdr->md_sectorsize; 1686 if (sectsize > maxphys || mdr->md_mediasize < sectsize) 1687 return (EINVAL); 1688 if (mdr->md_options & MD_AUTOUNIT) 1689 sc = mdnew(-1, &error, mdr->md_type); 1690 else { 1691 if (mdr->md_unit > INT_MAX) 1692 return (EINVAL); 1693 sc = mdnew(mdr->md_unit, &error, mdr->md_type); 1694 } 1695 if (sc == NULL) 1696 return (error); 1697 if (mdr->md_label != NULL) 1698 error = copyinstr(mdr->md_label, sc->label, 1699 sizeof(sc->label), NULL); 1700 if (error != 0) 1701 goto err_after_new; 1702 if (mdr->md_options & MD_AUTOUNIT) 1703 mdr->md_unit = sc->unit; 1704 sc->mediasize = mdr->md_mediasize; 1705 sc->sectorsize = sectsize; 1706 error = EDOOFUS; 1707 switch (sc->type) { 1708 case MD_MALLOC: 1709 sc->start = mdstart_malloc; 1710 error = mdcreate_malloc(sc, mdr); 1711 break; 1712 case MD_PRELOAD: 1713 /* 1714 * We disallow attaching preloaded memory disks via 1715 * ioctl. Preloaded memory disks are automatically 1716 * attached in g_md_init(). 1717 */ 1718 error = EOPNOTSUPP; 1719 break; 1720 case MD_VNODE: 1721 sc->start = mdstart_vnode; 1722 error = mdcreate_vnode(sc, mdr, td); 1723 break; 1724 case MD_SWAP: 1725 sc->start = mdstart_swap; 1726 error = mdcreate_swap(sc, mdr, td); 1727 break; 1728 case MD_NULL: 1729 sc->start = mdstart_null; 1730 error = mdcreate_null(sc, mdr, td); 1731 break; 1732 } 1733 err_after_new: 1734 if (error != 0) { 1735 mddestroy(sc, td); 1736 return (error); 1737 } 1738 1739 /* Prune off any residual fractional sector */ 1740 i = sc->mediasize % sc->sectorsize; 1741 sc->mediasize -= i; 1742 1743 mdinit(sc); 1744 return (0); 1745 } 1746 1747 static int 1748 kern_mdattach(struct thread *td, struct md_req *mdr) 1749 { 1750 int error; 1751 1752 sx_xlock(&md_sx); 1753 error = kern_mdattach_locked(td, mdr); 1754 sx_xunlock(&md_sx); 1755 return (error); 1756 } 1757 1758 static int 1759 kern_mddetach_locked(struct thread *td, struct md_req *mdr) 1760 { 1761 struct md_s *sc; 1762 1763 sx_assert(&md_sx, SA_XLOCKED); 1764 1765 if (mdr->md_mediasize != 0 || 1766 (mdr->md_options & ~MD_FORCE) != 0) 1767 return (EINVAL); 1768 1769 sc = mdfind(mdr->md_unit); 1770 if (sc == NULL) 1771 return (ENOENT); 1772 if (sc->opencount != 0 && !(sc->flags & MD_FORCE) && 1773 !(mdr->md_options & MD_FORCE)) 1774 return (EBUSY); 1775 return (mddestroy(sc, td)); 1776 } 1777 1778 static int 1779 kern_mddetach(struct thread *td, struct md_req *mdr) 1780 { 1781 int error; 1782 1783 sx_xlock(&md_sx); 1784 error = kern_mddetach_locked(td, mdr); 1785 sx_xunlock(&md_sx); 1786 return (error); 1787 } 1788 1789 static int 1790 kern_mdresize_locked(struct md_req *mdr) 1791 { 1792 struct md_s *sc; 1793 1794 sx_assert(&md_sx, SA_XLOCKED); 1795 1796 if ((mdr->md_options & ~(MD_FORCE | MD_RESERVE)) != 0) 1797 return (EINVAL); 1798 1799 sc = mdfind(mdr->md_unit); 1800 if (sc == NULL) 1801 return (ENOENT); 1802 if (mdr->md_mediasize < sc->sectorsize) 1803 return (EINVAL); 1804 if (mdr->md_mediasize < sc->mediasize && 1805 !(sc->flags & MD_FORCE) && 1806 !(mdr->md_options & MD_FORCE)) 1807 return (EBUSY); 1808 return (mdresize(sc, mdr)); 1809 } 1810 1811 static int 1812 kern_mdresize(struct md_req *mdr) 1813 { 1814 int error; 1815 1816 sx_xlock(&md_sx); 1817 error = kern_mdresize_locked(mdr); 1818 sx_xunlock(&md_sx); 1819 return (error); 1820 } 1821 1822 static int 1823 kern_mdquery_locked(struct md_req *mdr) 1824 { 1825 struct md_s *sc; 1826 int error; 1827 1828 sx_assert(&md_sx, SA_XLOCKED); 1829 1830 sc = mdfind(mdr->md_unit); 1831 if (sc == NULL) 1832 return (ENOENT); 1833 mdr->md_type = sc->type; 1834 mdr->md_options = sc->flags; 1835 mdr->md_mediasize = sc->mediasize; 1836 mdr->md_sectorsize = sc->sectorsize; 1837 error = 0; 1838 if (mdr->md_label != NULL) { 1839 error = copyout(sc->label, mdr->md_label, 1840 strlen(sc->label) + 1); 1841 if (error != 0) 1842 return (error); 1843 } 1844 if (sc->type == MD_VNODE || 1845 (sc->type == MD_PRELOAD && mdr->md_file != NULL)) 1846 error = copyout(sc->file, mdr->md_file, 1847 strlen(sc->file) + 1); 1848 return (error); 1849 } 1850 1851 static int 1852 kern_mdquery(struct md_req *mdr) 1853 { 1854 int error; 1855 1856 sx_xlock(&md_sx); 1857 error = kern_mdquery_locked(mdr); 1858 sx_xunlock(&md_sx); 1859 return (error); 1860 } 1861 1862 /* Copy members that are not userspace pointers. */ 1863 #define MD_IOCTL2REQ(mdio, mdr) do { \ 1864 (mdr)->md_unit = (mdio)->md_unit; \ 1865 (mdr)->md_type = (mdio)->md_type; \ 1866 (mdr)->md_mediasize = (mdio)->md_mediasize; \ 1867 (mdr)->md_sectorsize = (mdio)->md_sectorsize; \ 1868 (mdr)->md_options = (mdio)->md_options; \ 1869 (mdr)->md_fwheads = (mdio)->md_fwheads; \ 1870 (mdr)->md_fwsectors = (mdio)->md_fwsectors; \ 1871 (mdr)->md_units = &(mdio)->md_pad[0]; \ 1872 (mdr)->md_units_nitems = nitems((mdio)->md_pad); \ 1873 } while(0) 1874 1875 /* Copy members that might have been updated */ 1876 #define MD_REQ2IOCTL(mdr, mdio) do { \ 1877 (mdio)->md_unit = (mdr)->md_unit; \ 1878 (mdio)->md_type = (mdr)->md_type; \ 1879 (mdio)->md_mediasize = (mdr)->md_mediasize; \ 1880 (mdio)->md_sectorsize = (mdr)->md_sectorsize; \ 1881 (mdio)->md_options = (mdr)->md_options; \ 1882 (mdio)->md_fwheads = (mdr)->md_fwheads; \ 1883 (mdio)->md_fwsectors = (mdr)->md_fwsectors; \ 1884 } while(0) 1885 1886 static int 1887 mdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, 1888 struct thread *td) 1889 { 1890 struct md_req mdr; 1891 int error; 1892 1893 if (md_debug) 1894 printf("mdctlioctl(%s %lx %p %x %p)\n", 1895 devtoname(dev), cmd, addr, flags, td); 1896 1897 bzero(&mdr, sizeof(mdr)); 1898 switch (cmd) { 1899 case MDIOCATTACH: 1900 case MDIOCDETACH: 1901 case MDIOCRESIZE: 1902 case MDIOCQUERY: { 1903 struct md_ioctl *mdio = (struct md_ioctl *)addr; 1904 if (mdio->md_version != MDIOVERSION) 1905 return (EINVAL); 1906 MD_IOCTL2REQ(mdio, &mdr); 1907 mdr.md_file = mdio->md_file; 1908 mdr.md_file_seg = UIO_USERSPACE; 1909 /* If the file is adjacent to the md_ioctl it's in kernel. */ 1910 if ((void *)mdio->md_file == (void *)(mdio + 1)) 1911 mdr.md_file_seg = UIO_SYSSPACE; 1912 mdr.md_label = mdio->md_label; 1913 break; 1914 } 1915 #ifdef COMPAT_FREEBSD32 1916 case MDIOCATTACH_32: 1917 case MDIOCDETACH_32: 1918 case MDIOCRESIZE_32: 1919 case MDIOCQUERY_32: { 1920 struct md_ioctl32 *mdio = (struct md_ioctl32 *)addr; 1921 if (mdio->md_version != MDIOVERSION) 1922 return (EINVAL); 1923 MD_IOCTL2REQ(mdio, &mdr); 1924 mdr.md_file = (void *)(uintptr_t)mdio->md_file; 1925 mdr.md_file_seg = UIO_USERSPACE; 1926 mdr.md_label = (void *)(uintptr_t)mdio->md_label; 1927 break; 1928 } 1929 #endif 1930 default: 1931 /* Fall through to handler switch. */ 1932 break; 1933 } 1934 1935 error = 0; 1936 switch (cmd) { 1937 case MDIOCATTACH: 1938 #ifdef COMPAT_FREEBSD32 1939 case MDIOCATTACH_32: 1940 #endif 1941 error = kern_mdattach(td, &mdr); 1942 break; 1943 case MDIOCDETACH: 1944 #ifdef COMPAT_FREEBSD32 1945 case MDIOCDETACH_32: 1946 #endif 1947 error = kern_mddetach(td, &mdr); 1948 break; 1949 case MDIOCRESIZE: 1950 #ifdef COMPAT_FREEBSD32 1951 case MDIOCRESIZE_32: 1952 #endif 1953 error = kern_mdresize(&mdr); 1954 break; 1955 case MDIOCQUERY: 1956 #ifdef COMPAT_FREEBSD32 1957 case MDIOCQUERY_32: 1958 #endif 1959 error = kern_mdquery(&mdr); 1960 break; 1961 default: 1962 error = ENOIOCTL; 1963 } 1964 1965 switch (cmd) { 1966 case MDIOCATTACH: 1967 case MDIOCQUERY: { 1968 struct md_ioctl *mdio = (struct md_ioctl *)addr; 1969 MD_REQ2IOCTL(&mdr, mdio); 1970 break; 1971 } 1972 #ifdef COMPAT_FREEBSD32 1973 case MDIOCATTACH_32: 1974 case MDIOCQUERY_32: { 1975 struct md_ioctl32 *mdio = (struct md_ioctl32 *)addr; 1976 MD_REQ2IOCTL(&mdr, mdio); 1977 break; 1978 } 1979 #endif 1980 default: 1981 /* Other commands to not alter mdr. */ 1982 break; 1983 } 1984 1985 return (error); 1986 } 1987 1988 static void 1989 md_preloaded(u_char *image, size_t length, const char *name) 1990 { 1991 struct md_s *sc; 1992 int error; 1993 1994 sc = mdnew(-1, &error, MD_PRELOAD); 1995 if (sc == NULL) 1996 return; 1997 sc->mediasize = length; 1998 sc->sectorsize = DEV_BSIZE; 1999 sc->pl_ptr = image; 2000 sc->pl_len = length; 2001 sc->start = mdstart_preload; 2002 if (name != NULL) 2003 strlcpy(sc->file, name, sizeof(sc->file)); 2004 #ifdef MD_ROOT 2005 if (sc->unit == 0) { 2006 #ifndef ROOTDEVNAME 2007 rootdevnames[0] = MD_ROOT_FSTYPE ":/dev/md0"; 2008 #endif 2009 #ifdef MD_ROOT_READONLY 2010 sc->flags |= MD_READONLY; 2011 #endif 2012 } 2013 #endif 2014 mdinit(sc); 2015 if (name != NULL) { 2016 printf("%s%d: Preloaded image <%s> %zd bytes at %p\n", 2017 MD_NAME, sc->unit, name, length, image); 2018 } else { 2019 printf("%s%d: Embedded image %zd bytes at %p\n", 2020 MD_NAME, sc->unit, length, image); 2021 } 2022 } 2023 2024 static void 2025 g_md_init(struct g_class *mp __unused) 2026 { 2027 caddr_t mod; 2028 u_char *ptr, *name, *type; 2029 unsigned len; 2030 int i; 2031 2032 /* figure out log2(NINDIR) */ 2033 for (i = NINDIR, nshift = -1; i; nshift++) 2034 i >>= 1; 2035 2036 mod = NULL; 2037 sx_init(&md_sx, "MD config lock"); 2038 g_topology_unlock(); 2039 md_uh = new_unrhdr(0, INT_MAX, NULL); 2040 #ifdef MD_ROOT 2041 if (mfs_root_size != 0) { 2042 sx_xlock(&md_sx); 2043 #ifdef MD_ROOT_MEM 2044 md_preloaded(mfs_root, mfs_root_size, NULL); 2045 #else 2046 md_preloaded(__DEVOLATILE(u_char *, &mfs_root), mfs_root_size, 2047 NULL); 2048 #endif 2049 sx_xunlock(&md_sx); 2050 } 2051 #endif 2052 /* XXX: are preload_* static or do they need Giant ? */ 2053 while ((mod = preload_search_next_name(mod)) != NULL) { 2054 name = (char *)preload_search_info(mod, MODINFO_NAME); 2055 if (name == NULL) 2056 continue; 2057 type = (char *)preload_search_info(mod, MODINFO_TYPE); 2058 if (type == NULL) 2059 continue; 2060 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 2061 continue; 2062 ptr = preload_fetch_addr(mod); 2063 len = preload_fetch_size(mod); 2064 if (ptr != NULL && len != 0) { 2065 sx_xlock(&md_sx); 2066 md_preloaded(ptr, len, name); 2067 sx_xunlock(&md_sx); 2068 } 2069 } 2070 md_pbuf_zone = pbuf_zsecond_create("mdpbuf", nswbuf / 10); 2071 status_dev = make_dev(&mdctl_cdevsw, INT_MAX, UID_ROOT, GID_WHEEL, 2072 0600, MDCTL_NAME); 2073 g_topology_lock(); 2074 } 2075 2076 static void 2077 g_md_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 2078 struct g_consumer *cp __unused, struct g_provider *pp) 2079 { 2080 struct md_s *mp; 2081 char *type; 2082 2083 mp = gp->softc; 2084 if (mp == NULL) 2085 return; 2086 2087 switch (mp->type) { 2088 case MD_MALLOC: 2089 type = "malloc"; 2090 break; 2091 case MD_PRELOAD: 2092 type = "preload"; 2093 break; 2094 case MD_VNODE: 2095 type = "vnode"; 2096 break; 2097 case MD_SWAP: 2098 type = "swap"; 2099 break; 2100 case MD_NULL: 2101 type = "null"; 2102 break; 2103 default: 2104 type = "unknown"; 2105 break; 2106 } 2107 2108 if (pp != NULL) { 2109 if (indent == NULL) { 2110 sbuf_printf(sb, " u %d", mp->unit); 2111 sbuf_printf(sb, " s %ju", (uintmax_t) mp->sectorsize); 2112 sbuf_printf(sb, " f %ju", (uintmax_t) mp->fwheads); 2113 sbuf_printf(sb, " fs %ju", (uintmax_t) mp->fwsectors); 2114 sbuf_printf(sb, " l %ju", (uintmax_t) mp->mediasize); 2115 sbuf_printf(sb, " t %s", type); 2116 if ((mp->type == MD_VNODE && mp->vnode != NULL) || 2117 (mp->type == MD_PRELOAD && mp->file[0] != '\0')) 2118 sbuf_printf(sb, " file %s", mp->file); 2119 sbuf_printf(sb, " label %s", mp->label); 2120 } else { 2121 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent, 2122 mp->unit); 2123 sbuf_printf(sb, "%s<sectorsize>%ju</sectorsize>\n", 2124 indent, (uintmax_t) mp->sectorsize); 2125 sbuf_printf(sb, "%s<fwheads>%ju</fwheads>\n", 2126 indent, (uintmax_t) mp->fwheads); 2127 sbuf_printf(sb, "%s<fwsectors>%ju</fwsectors>\n", 2128 indent, (uintmax_t) mp->fwsectors); 2129 if (mp->ident[0] != '\0') { 2130 sbuf_printf(sb, "%s<ident>", indent); 2131 g_conf_printf_escaped(sb, "%s", mp->ident); 2132 sbuf_printf(sb, "</ident>\n"); 2133 } 2134 sbuf_printf(sb, "%s<length>%ju</length>\n", 2135 indent, (uintmax_t) mp->mediasize); 2136 sbuf_printf(sb, "%s<compression>%s</compression>\n", indent, 2137 (mp->flags & MD_COMPRESS) == 0 ? "off": "on"); 2138 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 2139 (mp->flags & MD_READONLY) == 0 ? "read-write": 2140 "read-only"); 2141 sbuf_printf(sb, "%s<type>%s</type>\n", indent, 2142 type); 2143 if ((mp->type == MD_VNODE && mp->vnode != NULL) || 2144 (mp->type == MD_PRELOAD && mp->file[0] != '\0')) { 2145 sbuf_printf(sb, "%s<file>", indent); 2146 g_conf_printf_escaped(sb, "%s", mp->file); 2147 sbuf_printf(sb, "</file>\n"); 2148 } 2149 if (mp->type == MD_VNODE) 2150 sbuf_printf(sb, "%s<cache>%s</cache>\n", indent, 2151 (mp->flags & MD_CACHE) == 0 ? "off": "on"); 2152 sbuf_printf(sb, "%s<label>", indent); 2153 g_conf_printf_escaped(sb, "%s", mp->label); 2154 sbuf_printf(sb, "</label>\n"); 2155 } 2156 } 2157 } 2158 2159 static void 2160 g_md_fini(struct g_class *mp __unused) 2161 { 2162 2163 sx_destroy(&md_sx); 2164 if (status_dev != NULL) 2165 destroy_dev(status_dev); 2166 uma_zdestroy(md_pbuf_zone); 2167 delete_unrhdr(md_uh); 2168 }
Cache object: 6836251de81af63f795938cfc7d7997e
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