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/unistd.h> 94 #include <sys/vnode.h> 95 #include <sys/disk.h> 96 97 #include <geom/geom.h> 98 #include <geom/geom_int.h> 99 100 #include <vm/vm.h> 101 #include <vm/vm_param.h> 102 #include <vm/vm_object.h> 103 #include <vm/vm_page.h> 104 #include <vm/vm_pager.h> 105 #include <vm/swap_pager.h> 106 #include <vm/uma.h> 107 108 #include <machine/bus.h> 109 110 #define MD_MODVER 1 111 112 #define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */ 113 #define MD_EXITING 0x20000 /* Worker thread is exiting. */ 114 #define MD_PROVIDERGONE 0x40000 /* Safe to free the softc */ 115 116 #ifndef MD_NSECT 117 #define MD_NSECT (10000 * 2) 118 #endif 119 120 struct md_req { 121 unsigned md_unit; /* unit number */ 122 enum md_types md_type; /* type of disk */ 123 off_t md_mediasize; /* size of disk in bytes */ 124 unsigned md_sectorsize; /* sectorsize */ 125 unsigned md_options; /* options */ 126 int md_fwheads; /* firmware heads */ 127 int md_fwsectors; /* firmware sectors */ 128 char *md_file; /* pathname of file to mount */ 129 enum uio_seg md_file_seg; /* location of md_file */ 130 char *md_label; /* label of the device (userspace) */ 131 int *md_units; /* pointer to units array (kernel) */ 132 size_t md_units_nitems; /* items in md_units array */ 133 }; 134 135 #ifdef COMPAT_FREEBSD32 136 struct md_ioctl32 { 137 unsigned md_version; 138 unsigned md_unit; 139 enum md_types md_type; 140 uint32_t md_file; 141 off_t md_mediasize; 142 unsigned md_sectorsize; 143 unsigned md_options; 144 uint64_t md_base; 145 int md_fwheads; 146 int md_fwsectors; 147 uint32_t md_label; 148 int md_pad[MDNPAD]; 149 } __attribute__((__packed__)); 150 CTASSERT((sizeof(struct md_ioctl32)) == 436); 151 152 #define MDIOCATTACH_32 _IOC_NEWTYPE(MDIOCATTACH, struct md_ioctl32) 153 #define MDIOCDETACH_32 _IOC_NEWTYPE(MDIOCDETACH, struct md_ioctl32) 154 #define MDIOCQUERY_32 _IOC_NEWTYPE(MDIOCQUERY, struct md_ioctl32) 155 #define MDIOCRESIZE_32 _IOC_NEWTYPE(MDIOCRESIZE, struct md_ioctl32) 156 #endif /* COMPAT_FREEBSD32 */ 157 158 static MALLOC_DEFINE(M_MD, "md_disk", "Memory Disk"); 159 static MALLOC_DEFINE(M_MDSECT, "md_sectors", "Memory Disk Sectors"); 160 161 static int md_debug; 162 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, 163 "Enable md(4) debug messages"); 164 static int md_malloc_wait; 165 SYSCTL_INT(_vm, OID_AUTO, md_malloc_wait, CTLFLAG_RW, &md_malloc_wait, 0, 166 "Allow malloc to wait for memory allocations"); 167 168 #if defined(MD_ROOT) && !defined(MD_ROOT_FSTYPE) 169 #define MD_ROOT_FSTYPE "ufs" 170 #endif 171 172 #if defined(MD_ROOT) 173 /* 174 * Preloaded image gets put here. 175 */ 176 #if defined(MD_ROOT_SIZE) 177 /* 178 * We put the mfs_root symbol into the oldmfs section of the kernel object file. 179 * Applications that patch the object with the image can determine 180 * the size looking at the oldmfs section size within the kernel. 181 */ 182 u_char mfs_root[MD_ROOT_SIZE*1024] __attribute__ ((section ("oldmfs"))); 183 const int mfs_root_size = sizeof(mfs_root); 184 #elif defined(MD_ROOT_MEM) 185 /* MD region already mapped in the memory */ 186 u_char *mfs_root; 187 int mfs_root_size; 188 #else 189 extern volatile u_char __weak_symbol mfs_root; 190 extern volatile u_char __weak_symbol mfs_root_end; 191 #define mfs_root_size ((uintptr_t)(&mfs_root_end - &mfs_root)) 192 #endif 193 #endif 194 195 static g_init_t g_md_init; 196 static g_fini_t g_md_fini; 197 static g_start_t g_md_start; 198 static g_access_t g_md_access; 199 static void g_md_dumpconf(struct sbuf *sb, const char *indent, 200 struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp); 201 static g_provgone_t g_md_providergone; 202 203 static struct cdev *status_dev = NULL; 204 static struct sx md_sx; 205 static struct unrhdr *md_uh; 206 207 static d_ioctl_t mdctlioctl; 208 209 static struct cdevsw mdctl_cdevsw = { 210 .d_version = D_VERSION, 211 .d_ioctl = mdctlioctl, 212 .d_name = MD_NAME, 213 }; 214 215 struct g_class g_md_class = { 216 .name = "MD", 217 .version = G_VERSION, 218 .init = g_md_init, 219 .fini = g_md_fini, 220 .start = g_md_start, 221 .access = g_md_access, 222 .dumpconf = g_md_dumpconf, 223 .providergone = g_md_providergone, 224 }; 225 226 DECLARE_GEOM_CLASS(g_md_class, g_md); 227 MODULE_VERSION(geom_md, 0); 228 229 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(md_softc_list); 230 231 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 232 #define NMASK (NINDIR-1) 233 static int nshift; 234 235 static uma_zone_t md_pbuf_zone; 236 237 struct indir { 238 uintptr_t *array; 239 u_int total; 240 u_int used; 241 u_int shift; 242 }; 243 244 struct md_s { 245 int unit; 246 LIST_ENTRY(md_s) list; 247 struct bio_queue_head bio_queue; 248 struct mtx queue_mtx; 249 struct cdev *dev; 250 enum md_types type; 251 off_t mediasize; 252 unsigned sectorsize; 253 unsigned opencount; 254 unsigned fwheads; 255 unsigned fwsectors; 256 char ident[32]; 257 unsigned flags; 258 char name[20]; 259 struct proc *procp; 260 struct g_geom *gp; 261 struct g_provider *pp; 262 int (*start)(struct md_s *sc, struct bio *bp); 263 struct devstat *devstat; 264 bool candelete; 265 266 /* MD_MALLOC related fields */ 267 struct indir *indir; 268 uma_zone_t uma; 269 270 /* MD_PRELOAD related fields */ 271 u_char *pl_ptr; 272 size_t pl_len; 273 274 /* MD_VNODE related fields */ 275 struct vnode *vnode; 276 char file[PATH_MAX]; 277 char label[PATH_MAX]; 278 struct ucred *cred; 279 280 /* MD_SWAP related fields */ 281 vm_object_t object; 282 }; 283 284 static struct indir * 285 new_indir(u_int shift) 286 { 287 struct indir *ip; 288 289 ip = malloc(sizeof *ip, M_MD, (md_malloc_wait ? M_WAITOK : M_NOWAIT) 290 | M_ZERO); 291 if (ip == NULL) 292 return (NULL); 293 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 294 M_MDSECT, (md_malloc_wait ? M_WAITOK : M_NOWAIT) | M_ZERO); 295 if (ip->array == NULL) { 296 free(ip, M_MD); 297 return (NULL); 298 } 299 ip->total = NINDIR; 300 ip->shift = shift; 301 return (ip); 302 } 303 304 static void 305 del_indir(struct indir *ip) 306 { 307 308 free(ip->array, M_MDSECT); 309 free(ip, M_MD); 310 } 311 312 static void 313 destroy_indir(struct md_s *sc, struct indir *ip) 314 { 315 int i; 316 317 for (i = 0; i < NINDIR; i++) { 318 if (!ip->array[i]) 319 continue; 320 if (ip->shift) 321 destroy_indir(sc, (struct indir*)(ip->array[i])); 322 else if (ip->array[i] > 255) 323 uma_zfree(sc->uma, (void *)(ip->array[i])); 324 } 325 del_indir(ip); 326 } 327 328 /* 329 * This function does the math and allocates the top level "indir" structure 330 * for a device of "size" sectors. 331 */ 332 333 static struct indir * 334 dimension(off_t size) 335 { 336 off_t rcnt; 337 struct indir *ip; 338 int layer; 339 340 rcnt = size; 341 layer = 0; 342 while (rcnt > NINDIR) { 343 rcnt /= NINDIR; 344 layer++; 345 } 346 347 /* 348 * XXX: the top layer is probably not fully populated, so we allocate 349 * too much space for ip->array in here. 350 */ 351 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO); 352 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 353 M_MDSECT, M_WAITOK | M_ZERO); 354 ip->total = NINDIR; 355 ip->shift = layer * nshift; 356 return (ip); 357 } 358 359 /* 360 * Read a given sector 361 */ 362 363 static uintptr_t 364 s_read(struct indir *ip, off_t offset) 365 { 366 struct indir *cip; 367 int idx; 368 uintptr_t up; 369 370 if (md_debug > 1) 371 printf("s_read(%jd)\n", (intmax_t)offset); 372 up = 0; 373 for (cip = ip; cip != NULL;) { 374 if (cip->shift) { 375 idx = (offset >> cip->shift) & NMASK; 376 up = cip->array[idx]; 377 cip = (struct indir *)up; 378 continue; 379 } 380 idx = offset & NMASK; 381 return (cip->array[idx]); 382 } 383 return (0); 384 } 385 386 /* 387 * Write a given sector, prune the tree if the value is 0 388 */ 389 390 static int 391 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 392 { 393 struct indir *cip, *lip[10]; 394 int idx, li; 395 uintptr_t up; 396 397 if (md_debug > 1) 398 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 399 up = 0; 400 li = 0; 401 cip = ip; 402 for (;;) { 403 lip[li++] = cip; 404 if (cip->shift) { 405 idx = (offset >> cip->shift) & NMASK; 406 up = cip->array[idx]; 407 if (up != 0) { 408 cip = (struct indir *)up; 409 continue; 410 } 411 /* Allocate branch */ 412 cip->array[idx] = 413 (uintptr_t)new_indir(cip->shift - nshift); 414 if (cip->array[idx] == 0) 415 return (ENOSPC); 416 cip->used++; 417 up = cip->array[idx]; 418 cip = (struct indir *)up; 419 continue; 420 } 421 /* leafnode */ 422 idx = offset & NMASK; 423 up = cip->array[idx]; 424 if (up != 0) 425 cip->used--; 426 cip->array[idx] = ptr; 427 if (ptr != 0) 428 cip->used++; 429 break; 430 } 431 if (cip->used != 0 || li == 1) 432 return (0); 433 li--; 434 while (cip->used == 0 && cip != ip) { 435 li--; 436 idx = (offset >> lip[li]->shift) & NMASK; 437 up = lip[li]->array[idx]; 438 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 439 del_indir(cip); 440 lip[li]->array[idx] = 0; 441 lip[li]->used--; 442 cip = lip[li]; 443 } 444 return (0); 445 } 446 447 static int 448 g_md_access(struct g_provider *pp, int r, int w, int e) 449 { 450 struct md_s *sc; 451 452 sc = pp->geom->softc; 453 if (sc == NULL) { 454 if (r <= 0 && w <= 0 && e <= 0) 455 return (0); 456 return (ENXIO); 457 } 458 r += pp->acr; 459 w += pp->acw; 460 e += pp->ace; 461 if ((sc->flags & MD_READONLY) != 0 && w > 0) 462 return (EROFS); 463 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 464 sc->opencount = 1; 465 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 466 sc->opencount = 0; 467 } 468 return (0); 469 } 470 471 static void 472 g_md_start(struct bio *bp) 473 { 474 struct md_s *sc; 475 476 sc = bp->bio_to->geom->softc; 477 if ((bp->bio_cmd == BIO_READ) || (bp->bio_cmd == BIO_WRITE)) { 478 devstat_start_transaction_bio(sc->devstat, bp); 479 } 480 mtx_lock(&sc->queue_mtx); 481 bioq_disksort(&sc->bio_queue, bp); 482 wakeup(sc); 483 mtx_unlock(&sc->queue_mtx); 484 } 485 486 #define MD_MALLOC_MOVE_ZERO 1 487 #define MD_MALLOC_MOVE_FILL 2 488 #define MD_MALLOC_MOVE_READ 3 489 #define MD_MALLOC_MOVE_WRITE 4 490 #define MD_MALLOC_MOVE_CMP 5 491 492 static int 493 md_malloc_move_ma(vm_page_t **mp, int *ma_offs, unsigned sectorsize, 494 void *ptr, u_char fill, int op) 495 { 496 struct sf_buf *sf; 497 vm_page_t m, *mp1; 498 char *p, first; 499 off_t *uc; 500 unsigned n; 501 int error, i, ma_offs1, sz, first_read; 502 503 m = NULL; 504 error = 0; 505 sf = NULL; 506 /* if (op == MD_MALLOC_MOVE_CMP) { gcc */ 507 first = 0; 508 first_read = 0; 509 uc = ptr; 510 mp1 = *mp; 511 ma_offs1 = *ma_offs; 512 /* } */ 513 sched_pin(); 514 for (n = sectorsize; n != 0; n -= sz) { 515 sz = imin(PAGE_SIZE - *ma_offs, n); 516 if (m != **mp) { 517 if (sf != NULL) 518 sf_buf_free(sf); 519 m = **mp; 520 sf = sf_buf_alloc(m, SFB_CPUPRIVATE | 521 (md_malloc_wait ? 0 : SFB_NOWAIT)); 522 if (sf == NULL) { 523 error = ENOMEM; 524 break; 525 } 526 } 527 p = (char *)sf_buf_kva(sf) + *ma_offs; 528 switch (op) { 529 case MD_MALLOC_MOVE_ZERO: 530 bzero(p, sz); 531 break; 532 case MD_MALLOC_MOVE_FILL: 533 memset(p, fill, sz); 534 break; 535 case MD_MALLOC_MOVE_READ: 536 bcopy(ptr, p, sz); 537 cpu_flush_dcache(p, sz); 538 break; 539 case MD_MALLOC_MOVE_WRITE: 540 bcopy(p, ptr, sz); 541 break; 542 case MD_MALLOC_MOVE_CMP: 543 for (i = 0; i < sz; i++, p++) { 544 if (!first_read) { 545 *uc = (u_char)*p; 546 first = *p; 547 first_read = 1; 548 } else if (*p != first) { 549 error = EDOOFUS; 550 break; 551 } 552 } 553 break; 554 default: 555 KASSERT(0, ("md_malloc_move_ma unknown op %d\n", op)); 556 break; 557 } 558 if (error != 0) 559 break; 560 *ma_offs += sz; 561 *ma_offs %= PAGE_SIZE; 562 if (*ma_offs == 0) 563 (*mp)++; 564 ptr = (char *)ptr + sz; 565 } 566 567 if (sf != NULL) 568 sf_buf_free(sf); 569 sched_unpin(); 570 if (op == MD_MALLOC_MOVE_CMP && error != 0) { 571 *mp = mp1; 572 *ma_offs = ma_offs1; 573 } 574 return (error); 575 } 576 577 static int 578 md_malloc_move_vlist(bus_dma_segment_t **pvlist, int *pma_offs, 579 unsigned len, void *ptr, u_char fill, int op) 580 { 581 bus_dma_segment_t *vlist; 582 uint8_t *p, *end, first; 583 off_t *uc; 584 int ma_offs, seg_len; 585 586 vlist = *pvlist; 587 ma_offs = *pma_offs; 588 uc = ptr; 589 590 for (; len != 0; len -= seg_len) { 591 seg_len = imin(vlist->ds_len - ma_offs, len); 592 p = (uint8_t *)(uintptr_t)vlist->ds_addr + ma_offs; 593 switch (op) { 594 case MD_MALLOC_MOVE_ZERO: 595 bzero(p, seg_len); 596 break; 597 case MD_MALLOC_MOVE_FILL: 598 memset(p, fill, seg_len); 599 break; 600 case MD_MALLOC_MOVE_READ: 601 bcopy(ptr, p, seg_len); 602 cpu_flush_dcache(p, seg_len); 603 break; 604 case MD_MALLOC_MOVE_WRITE: 605 bcopy(p, ptr, seg_len); 606 break; 607 case MD_MALLOC_MOVE_CMP: 608 end = p + seg_len; 609 first = *uc = *p; 610 /* Confirm all following bytes match the first */ 611 while (++p < end) { 612 if (*p != first) 613 return (EDOOFUS); 614 } 615 break; 616 default: 617 KASSERT(0, ("md_malloc_move_vlist unknown op %d\n", op)); 618 break; 619 } 620 621 ma_offs += seg_len; 622 if (ma_offs == vlist->ds_len) { 623 ma_offs = 0; 624 vlist++; 625 } 626 ptr = (uint8_t *)ptr + seg_len; 627 } 628 *pvlist = vlist; 629 *pma_offs = ma_offs; 630 631 return (0); 632 } 633 634 static int 635 mdstart_malloc(struct md_s *sc, struct bio *bp) 636 { 637 u_char *dst; 638 vm_page_t *m; 639 bus_dma_segment_t *vlist; 640 int i, error, error1, ma_offs, notmapped; 641 off_t secno, nsec, uc; 642 uintptr_t sp, osp; 643 644 switch (bp->bio_cmd) { 645 case BIO_READ: 646 case BIO_WRITE: 647 case BIO_DELETE: 648 break; 649 case BIO_FLUSH: 650 return (0); 651 default: 652 return (EOPNOTSUPP); 653 } 654 655 notmapped = (bp->bio_flags & BIO_UNMAPPED) != 0; 656 vlist = (bp->bio_flags & BIO_VLIST) != 0 ? 657 (bus_dma_segment_t *)bp->bio_data : NULL; 658 if (notmapped) { 659 m = bp->bio_ma; 660 ma_offs = bp->bio_ma_offset; 661 dst = NULL; 662 KASSERT(vlist == NULL, ("vlists cannot be unmapped")); 663 } else if (vlist != NULL) { 664 ma_offs = bp->bio_ma_offset; 665 dst = NULL; 666 } else { 667 dst = bp->bio_data; 668 } 669 670 nsec = bp->bio_length / sc->sectorsize; 671 secno = bp->bio_offset / sc->sectorsize; 672 error = 0; 673 while (nsec--) { 674 osp = s_read(sc->indir, secno); 675 if (bp->bio_cmd == BIO_DELETE) { 676 if (osp != 0) 677 error = s_write(sc->indir, secno, 0); 678 } else if (bp->bio_cmd == BIO_READ) { 679 if (osp == 0) { 680 if (notmapped) { 681 error = md_malloc_move_ma(&m, &ma_offs, 682 sc->sectorsize, NULL, 0, 683 MD_MALLOC_MOVE_ZERO); 684 } else if (vlist != NULL) { 685 error = md_malloc_move_vlist(&vlist, 686 &ma_offs, sc->sectorsize, NULL, 0, 687 MD_MALLOC_MOVE_ZERO); 688 } else 689 bzero(dst, sc->sectorsize); 690 } else if (osp <= 255) { 691 if (notmapped) { 692 error = md_malloc_move_ma(&m, &ma_offs, 693 sc->sectorsize, NULL, osp, 694 MD_MALLOC_MOVE_FILL); 695 } else if (vlist != NULL) { 696 error = md_malloc_move_vlist(&vlist, 697 &ma_offs, sc->sectorsize, NULL, osp, 698 MD_MALLOC_MOVE_FILL); 699 } else 700 memset(dst, osp, sc->sectorsize); 701 } else { 702 if (notmapped) { 703 error = md_malloc_move_ma(&m, &ma_offs, 704 sc->sectorsize, (void *)osp, 0, 705 MD_MALLOC_MOVE_READ); 706 } else if (vlist != NULL) { 707 error = md_malloc_move_vlist(&vlist, 708 &ma_offs, sc->sectorsize, 709 (void *)osp, 0, 710 MD_MALLOC_MOVE_READ); 711 } else { 712 bcopy((void *)osp, dst, sc->sectorsize); 713 cpu_flush_dcache(dst, sc->sectorsize); 714 } 715 } 716 osp = 0; 717 } else if (bp->bio_cmd == BIO_WRITE) { 718 if (sc->flags & MD_COMPRESS) { 719 if (notmapped) { 720 error1 = md_malloc_move_ma(&m, &ma_offs, 721 sc->sectorsize, &uc, 0, 722 MD_MALLOC_MOVE_CMP); 723 i = error1 == 0 ? sc->sectorsize : 0; 724 } else if (vlist != NULL) { 725 error1 = md_malloc_move_vlist(&vlist, 726 &ma_offs, sc->sectorsize, &uc, 0, 727 MD_MALLOC_MOVE_CMP); 728 i = error1 == 0 ? sc->sectorsize : 0; 729 } else { 730 uc = dst[0]; 731 for (i = 1; i < sc->sectorsize; i++) { 732 if (dst[i] != uc) 733 break; 734 } 735 } 736 } else { 737 i = 0; 738 uc = 0; 739 } 740 if (i == sc->sectorsize) { 741 if (osp != uc) 742 error = s_write(sc->indir, secno, uc); 743 } else { 744 if (osp <= 255) { 745 sp = (uintptr_t)uma_zalloc(sc->uma, 746 md_malloc_wait ? M_WAITOK : 747 M_NOWAIT); 748 if (sp == 0) { 749 error = ENOSPC; 750 break; 751 } 752 if (notmapped) { 753 error = md_malloc_move_ma(&m, 754 &ma_offs, sc->sectorsize, 755 (void *)sp, 0, 756 MD_MALLOC_MOVE_WRITE); 757 } else if (vlist != NULL) { 758 error = md_malloc_move_vlist( 759 &vlist, &ma_offs, 760 sc->sectorsize, (void *)sp, 761 0, MD_MALLOC_MOVE_WRITE); 762 } else { 763 bcopy(dst, (void *)sp, 764 sc->sectorsize); 765 } 766 error = s_write(sc->indir, secno, sp); 767 } else { 768 if (notmapped) { 769 error = md_malloc_move_ma(&m, 770 &ma_offs, sc->sectorsize, 771 (void *)osp, 0, 772 MD_MALLOC_MOVE_WRITE); 773 } else if (vlist != NULL) { 774 error = md_malloc_move_vlist( 775 &vlist, &ma_offs, 776 sc->sectorsize, (void *)osp, 777 0, MD_MALLOC_MOVE_WRITE); 778 } else { 779 bcopy(dst, (void *)osp, 780 sc->sectorsize); 781 } 782 osp = 0; 783 } 784 } 785 } else { 786 error = EOPNOTSUPP; 787 } 788 if (osp > 255) 789 uma_zfree(sc->uma, (void*)osp); 790 if (error != 0) 791 break; 792 secno++; 793 if (!notmapped && vlist == NULL) 794 dst += sc->sectorsize; 795 } 796 bp->bio_resid = 0; 797 return (error); 798 } 799 800 static void 801 mdcopyto_vlist(void *src, bus_dma_segment_t *vlist, off_t offset, off_t len) 802 { 803 off_t seg_len; 804 805 while (offset >= vlist->ds_len) { 806 offset -= vlist->ds_len; 807 vlist++; 808 } 809 810 while (len != 0) { 811 seg_len = omin(len, vlist->ds_len - offset); 812 bcopy(src, (void *)(uintptr_t)(vlist->ds_addr + offset), 813 seg_len); 814 offset = 0; 815 src = (uint8_t *)src + seg_len; 816 len -= seg_len; 817 vlist++; 818 } 819 } 820 821 static void 822 mdcopyfrom_vlist(bus_dma_segment_t *vlist, off_t offset, void *dst, off_t len) 823 { 824 off_t seg_len; 825 826 while (offset >= vlist->ds_len) { 827 offset -= vlist->ds_len; 828 vlist++; 829 } 830 831 while (len != 0) { 832 seg_len = omin(len, vlist->ds_len - offset); 833 bcopy((void *)(uintptr_t)(vlist->ds_addr + offset), dst, 834 seg_len); 835 offset = 0; 836 dst = (uint8_t *)dst + seg_len; 837 len -= seg_len; 838 vlist++; 839 } 840 } 841 842 static int 843 mdstart_preload(struct md_s *sc, struct bio *bp) 844 { 845 uint8_t *p; 846 847 p = sc->pl_ptr + bp->bio_offset; 848 switch (bp->bio_cmd) { 849 case BIO_READ: 850 if ((bp->bio_flags & BIO_VLIST) != 0) { 851 mdcopyto_vlist(p, (bus_dma_segment_t *)bp->bio_data, 852 bp->bio_ma_offset, bp->bio_length); 853 } else { 854 bcopy(p, bp->bio_data, bp->bio_length); 855 } 856 cpu_flush_dcache(bp->bio_data, bp->bio_length); 857 break; 858 case BIO_WRITE: 859 if ((bp->bio_flags & BIO_VLIST) != 0) { 860 mdcopyfrom_vlist((bus_dma_segment_t *)bp->bio_data, 861 bp->bio_ma_offset, p, bp->bio_length); 862 } else { 863 bcopy(bp->bio_data, p, bp->bio_length); 864 } 865 break; 866 } 867 bp->bio_resid = 0; 868 return (0); 869 } 870 871 static int 872 mdstart_vnode(struct md_s *sc, struct bio *bp) 873 { 874 int error; 875 struct uio auio; 876 struct iovec aiov; 877 struct iovec *piov; 878 struct mount *mp; 879 struct vnode *vp; 880 struct buf *pb; 881 bus_dma_segment_t *vlist; 882 struct thread *td; 883 off_t iolen, iostart, off, len; 884 int ma_offs, npages; 885 886 switch (bp->bio_cmd) { 887 case BIO_READ: 888 auio.uio_rw = UIO_READ; 889 break; 890 case BIO_WRITE: 891 auio.uio_rw = UIO_WRITE; 892 break; 893 case BIO_FLUSH: 894 break; 895 case BIO_DELETE: 896 if (sc->candelete) 897 break; 898 /* FALLTHROUGH */ 899 default: 900 return (EOPNOTSUPP); 901 } 902 903 td = curthread; 904 vp = sc->vnode; 905 pb = NULL; 906 piov = NULL; 907 ma_offs = bp->bio_ma_offset; 908 off = bp->bio_offset; 909 len = bp->bio_length; 910 911 /* 912 * VNODE I/O 913 * 914 * If an error occurs, we set BIO_ERROR but we do not set 915 * B_INVAL because (for a write anyway), the buffer is 916 * still valid. 917 */ 918 919 if (bp->bio_cmd == BIO_FLUSH) { 920 do { 921 (void)vn_start_write(vp, &mp, V_WAIT); 922 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 923 error = VOP_FSYNC(vp, MNT_WAIT, td); 924 VOP_UNLOCK(vp); 925 vn_finished_write(mp); 926 } while (error == ERELOOKUP); 927 return (error); 928 } else if (bp->bio_cmd == BIO_DELETE) { 929 error = vn_deallocate(vp, &off, &len, 0, 930 sc->flags & MD_ASYNC ? 0 : IO_SYNC, sc->cred, NOCRED); 931 bp->bio_resid = len; 932 return (error); 933 } 934 935 auio.uio_offset = (vm_ooffset_t)bp->bio_offset; 936 auio.uio_resid = bp->bio_length; 937 auio.uio_segflg = UIO_SYSSPACE; 938 auio.uio_td = td; 939 940 if ((bp->bio_flags & BIO_VLIST) != 0) { 941 piov = malloc(sizeof(*piov) * bp->bio_ma_n, M_MD, M_WAITOK); 942 auio.uio_iov = piov; 943 vlist = (bus_dma_segment_t *)bp->bio_data; 944 while (len > 0) { 945 piov->iov_base = (void *)(uintptr_t)(vlist->ds_addr + 946 ma_offs); 947 piov->iov_len = vlist->ds_len - ma_offs; 948 if (piov->iov_len > len) 949 piov->iov_len = len; 950 len -= piov->iov_len; 951 ma_offs = 0; 952 vlist++; 953 piov++; 954 } 955 auio.uio_iovcnt = piov - auio.uio_iov; 956 piov = auio.uio_iov; 957 } else if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 958 pb = uma_zalloc(md_pbuf_zone, M_WAITOK); 959 MPASS((pb->b_flags & B_MAXPHYS) != 0); 960 bp->bio_resid = len; 961 unmapped_step: 962 npages = atop(min(maxphys, round_page(len + (ma_offs & 963 PAGE_MASK)))); 964 iolen = min(ptoa(npages) - (ma_offs & PAGE_MASK), len); 965 KASSERT(iolen > 0, ("zero iolen")); 966 pmap_qenter((vm_offset_t)pb->b_data, 967 &bp->bio_ma[atop(ma_offs)], npages); 968 aiov.iov_base = (void *)((vm_offset_t)pb->b_data + 969 (ma_offs & PAGE_MASK)); 970 aiov.iov_len = iolen; 971 auio.uio_iov = &aiov; 972 auio.uio_iovcnt = 1; 973 auio.uio_resid = iolen; 974 } else { 975 aiov.iov_base = bp->bio_data; 976 aiov.iov_len = bp->bio_length; 977 auio.uio_iov = &aiov; 978 auio.uio_iovcnt = 1; 979 } 980 iostart = auio.uio_offset; 981 if (auio.uio_rw == UIO_READ) { 982 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 983 error = VOP_READ(vp, &auio, 0, sc->cred); 984 VOP_UNLOCK(vp); 985 } else { 986 (void) vn_start_write(vp, &mp, V_WAIT); 987 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 988 error = VOP_WRITE(vp, &auio, sc->flags & MD_ASYNC ? 0 : IO_SYNC, 989 sc->cred); 990 VOP_UNLOCK(vp); 991 vn_finished_write(mp); 992 if (error == 0) 993 sc->flags &= ~MD_VERIFY; 994 } 995 996 /* When MD_CACHE is set, try to avoid double-caching the data. */ 997 if (error == 0 && (sc->flags & MD_CACHE) == 0) 998 VOP_ADVISE(vp, iostart, auio.uio_offset - 1, 999 POSIX_FADV_DONTNEED); 1000 1001 if (pb != NULL) { 1002 pmap_qremove((vm_offset_t)pb->b_data, npages); 1003 if (error == 0) { 1004 len -= iolen; 1005 bp->bio_resid -= iolen; 1006 ma_offs += iolen; 1007 if (len > 0) 1008 goto unmapped_step; 1009 } 1010 uma_zfree(md_pbuf_zone, pb); 1011 } else { 1012 bp->bio_resid = auio.uio_resid; 1013 } 1014 1015 free(piov, M_MD); 1016 return (error); 1017 } 1018 1019 static int 1020 mdstart_swap(struct md_s *sc, struct bio *bp) 1021 { 1022 vm_page_t m; 1023 u_char *p; 1024 vm_pindex_t i, lastp; 1025 bus_dma_segment_t *vlist; 1026 int rv, ma_offs, offs, len, lastend; 1027 1028 switch (bp->bio_cmd) { 1029 case BIO_READ: 1030 case BIO_WRITE: 1031 case BIO_DELETE: 1032 break; 1033 case BIO_FLUSH: 1034 return (0); 1035 default: 1036 return (EOPNOTSUPP); 1037 } 1038 1039 p = bp->bio_data; 1040 ma_offs = (bp->bio_flags & (BIO_UNMAPPED|BIO_VLIST)) != 0 ? 1041 bp->bio_ma_offset : 0; 1042 vlist = (bp->bio_flags & BIO_VLIST) != 0 ? 1043 (bus_dma_segment_t *)bp->bio_data : NULL; 1044 1045 /* 1046 * offs is the offset at which to start operating on the 1047 * next (ie, first) page. lastp is the last page on 1048 * which we're going to operate. lastend is the ending 1049 * position within that last page (ie, PAGE_SIZE if 1050 * we're operating on complete aligned pages). 1051 */ 1052 offs = bp->bio_offset % PAGE_SIZE; 1053 lastp = (bp->bio_offset + bp->bio_length - 1) / PAGE_SIZE; 1054 lastend = (bp->bio_offset + bp->bio_length - 1) % PAGE_SIZE + 1; 1055 1056 rv = VM_PAGER_OK; 1057 vm_object_pip_add(sc->object, 1); 1058 for (i = bp->bio_offset / PAGE_SIZE; i <= lastp; i++) { 1059 len = ((i == lastp) ? lastend : PAGE_SIZE) - offs; 1060 m = vm_page_grab_unlocked(sc->object, i, VM_ALLOC_SYSTEM); 1061 if (bp->bio_cmd == BIO_READ) { 1062 if (vm_page_all_valid(m)) 1063 rv = VM_PAGER_OK; 1064 else 1065 rv = vm_pager_get_pages(sc->object, &m, 1, 1066 NULL, NULL); 1067 if (rv == VM_PAGER_ERROR) { 1068 VM_OBJECT_WLOCK(sc->object); 1069 vm_page_free(m); 1070 VM_OBJECT_WUNLOCK(sc->object); 1071 break; 1072 } else if (rv == VM_PAGER_FAIL) { 1073 /* 1074 * Pager does not have the page. Zero 1075 * the allocated page, and mark it as 1076 * valid. Do not set dirty, the page 1077 * can be recreated if thrown out. 1078 */ 1079 pmap_zero_page(m); 1080 vm_page_valid(m); 1081 } 1082 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 1083 pmap_copy_pages(&m, offs, bp->bio_ma, 1084 ma_offs, len); 1085 } else if ((bp->bio_flags & BIO_VLIST) != 0) { 1086 physcopyout_vlist(VM_PAGE_TO_PHYS(m) + offs, 1087 vlist, ma_offs, len); 1088 cpu_flush_dcache(p, len); 1089 } else { 1090 physcopyout(VM_PAGE_TO_PHYS(m) + offs, p, len); 1091 cpu_flush_dcache(p, len); 1092 } 1093 } else if (bp->bio_cmd == BIO_WRITE) { 1094 if (len == PAGE_SIZE || vm_page_all_valid(m)) 1095 rv = VM_PAGER_OK; 1096 else 1097 rv = vm_pager_get_pages(sc->object, &m, 1, 1098 NULL, NULL); 1099 if (rv == VM_PAGER_ERROR) { 1100 VM_OBJECT_WLOCK(sc->object); 1101 vm_page_free(m); 1102 VM_OBJECT_WUNLOCK(sc->object); 1103 break; 1104 } else if (rv == VM_PAGER_FAIL) 1105 pmap_zero_page(m); 1106 1107 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 1108 pmap_copy_pages(bp->bio_ma, ma_offs, &m, 1109 offs, len); 1110 } else if ((bp->bio_flags & BIO_VLIST) != 0) { 1111 physcopyin_vlist(vlist, ma_offs, 1112 VM_PAGE_TO_PHYS(m) + offs, len); 1113 } else { 1114 physcopyin(p, VM_PAGE_TO_PHYS(m) + offs, len); 1115 } 1116 1117 vm_page_valid(m); 1118 vm_page_set_dirty(m); 1119 } else if (bp->bio_cmd == BIO_DELETE) { 1120 if (len == PAGE_SIZE || vm_page_all_valid(m)) 1121 rv = VM_PAGER_OK; 1122 else 1123 rv = vm_pager_get_pages(sc->object, &m, 1, 1124 NULL, NULL); 1125 VM_OBJECT_WLOCK(sc->object); 1126 if (rv == VM_PAGER_ERROR) { 1127 vm_page_free(m); 1128 VM_OBJECT_WUNLOCK(sc->object); 1129 break; 1130 } else if (rv == VM_PAGER_FAIL) { 1131 vm_page_free(m); 1132 m = NULL; 1133 } else { 1134 /* Page is valid. */ 1135 if (len != PAGE_SIZE) { 1136 pmap_zero_page_area(m, offs, len); 1137 vm_page_set_dirty(m); 1138 } else { 1139 vm_pager_page_unswapped(m); 1140 vm_page_free(m); 1141 m = NULL; 1142 } 1143 } 1144 VM_OBJECT_WUNLOCK(sc->object); 1145 } 1146 if (m != NULL) { 1147 /* 1148 * The page may be deactivated prior to setting 1149 * PGA_REFERENCED, but in this case it will be 1150 * reactivated by the page daemon. 1151 */ 1152 if (vm_page_active(m)) 1153 vm_page_reference(m); 1154 else 1155 vm_page_activate(m); 1156 vm_page_xunbusy(m); 1157 } 1158 1159 /* Actions on further pages start at offset 0 */ 1160 p += PAGE_SIZE - offs; 1161 offs = 0; 1162 ma_offs += len; 1163 } 1164 vm_object_pip_wakeup(sc->object); 1165 return (rv != VM_PAGER_ERROR ? 0 : ENOSPC); 1166 } 1167 1168 static int 1169 mdstart_null(struct md_s *sc, struct bio *bp) 1170 { 1171 1172 switch (bp->bio_cmd) { 1173 case BIO_READ: 1174 bzero(bp->bio_data, bp->bio_length); 1175 cpu_flush_dcache(bp->bio_data, bp->bio_length); 1176 break; 1177 case BIO_WRITE: 1178 break; 1179 } 1180 bp->bio_resid = 0; 1181 return (0); 1182 } 1183 1184 static void 1185 md_handleattr(struct md_s *sc, struct bio *bp) 1186 { 1187 if (sc->fwsectors && sc->fwheads && 1188 (g_handleattr_int(bp, "GEOM::fwsectors", sc->fwsectors) != 0 || 1189 g_handleattr_int(bp, "GEOM::fwheads", sc->fwheads) != 0)) 1190 return; 1191 if (g_handleattr_int(bp, "GEOM::candelete", sc->candelete) != 0) 1192 return; 1193 if (sc->ident[0] != '\0' && 1194 g_handleattr_str(bp, "GEOM::ident", sc->ident) != 0) 1195 return; 1196 if (g_handleattr_int(bp, "MNT::verified", (sc->flags & MD_VERIFY) != 0)) 1197 return; 1198 g_io_deliver(bp, EOPNOTSUPP); 1199 } 1200 1201 static void 1202 md_kthread(void *arg) 1203 { 1204 struct md_s *sc; 1205 struct bio *bp; 1206 int error; 1207 1208 sc = arg; 1209 thread_lock(curthread); 1210 sched_prio(curthread, PRIBIO); 1211 thread_unlock(curthread); 1212 if (sc->type == MD_VNODE) 1213 curthread->td_pflags |= TDP_NORUNNINGBUF; 1214 1215 for (;;) { 1216 mtx_lock(&sc->queue_mtx); 1217 if (sc->flags & MD_SHUTDOWN) { 1218 sc->flags |= MD_EXITING; 1219 mtx_unlock(&sc->queue_mtx); 1220 kproc_exit(0); 1221 } 1222 bp = bioq_takefirst(&sc->bio_queue); 1223 if (!bp) { 1224 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 1225 continue; 1226 } 1227 mtx_unlock(&sc->queue_mtx); 1228 if (bp->bio_cmd == BIO_GETATTR) { 1229 md_handleattr(sc, bp); 1230 } else { 1231 error = sc->start(sc, bp); 1232 if (bp->bio_cmd == BIO_READ || bp->bio_cmd == BIO_WRITE) { 1233 /* 1234 * Devstat uses (bio_bcount, bio_resid) for 1235 * determining the length of the completed part 1236 * of the i/o. g_io_deliver() will translate 1237 * from bio_completed to that, but it also 1238 * destroys the bio so we must do our own 1239 * translation. 1240 */ 1241 bp->bio_bcount = bp->bio_length; 1242 devstat_end_transaction_bio(sc->devstat, bp); 1243 } 1244 bp->bio_completed = bp->bio_length - bp->bio_resid; 1245 g_io_deliver(bp, error); 1246 } 1247 } 1248 } 1249 1250 static struct md_s * 1251 mdfind(int unit) 1252 { 1253 struct md_s *sc; 1254 1255 LIST_FOREACH(sc, &md_softc_list, list) { 1256 if (sc->unit == unit) 1257 break; 1258 } 1259 return (sc); 1260 } 1261 1262 static struct md_s * 1263 mdnew(int unit, int *errp, enum md_types type) 1264 { 1265 struct md_s *sc; 1266 int error; 1267 1268 *errp = 0; 1269 if (unit == -1) 1270 unit = alloc_unr(md_uh); 1271 else 1272 unit = alloc_unr_specific(md_uh, unit); 1273 1274 if (unit == -1) { 1275 *errp = EBUSY; 1276 return (NULL); 1277 } 1278 1279 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 1280 sc->type = type; 1281 bioq_init(&sc->bio_queue); 1282 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 1283 sc->unit = unit; 1284 sprintf(sc->name, "md%d", unit); 1285 LIST_INSERT_HEAD(&md_softc_list, sc, list); 1286 error = kproc_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 1287 if (error == 0) 1288 return (sc); 1289 LIST_REMOVE(sc, list); 1290 mtx_destroy(&sc->queue_mtx); 1291 free_unr(md_uh, sc->unit); 1292 free(sc, M_MD); 1293 *errp = error; 1294 return (NULL); 1295 } 1296 1297 static void 1298 mdinit(struct md_s *sc) 1299 { 1300 struct g_geom *gp; 1301 struct g_provider *pp; 1302 1303 g_topology_lock(); 1304 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 1305 gp->softc = sc; 1306 pp = g_new_providerf(gp, "md%d", sc->unit); 1307 devstat_remove_entry(pp->stat); 1308 pp->stat = NULL; 1309 pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE; 1310 pp->mediasize = sc->mediasize; 1311 pp->sectorsize = sc->sectorsize; 1312 switch (sc->type) { 1313 case MD_MALLOC: 1314 case MD_VNODE: 1315 case MD_SWAP: 1316 pp->flags |= G_PF_ACCEPT_UNMAPPED; 1317 break; 1318 case MD_PRELOAD: 1319 case MD_NULL: 1320 break; 1321 } 1322 sc->gp = gp; 1323 sc->pp = pp; 1324 sc->devstat = devstat_new_entry("md", sc->unit, sc->sectorsize, 1325 DEVSTAT_ALL_SUPPORTED, DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 1326 sc->devstat->id = pp; 1327 g_error_provider(pp, 0); 1328 g_topology_unlock(); 1329 } 1330 1331 static int 1332 mdcreate_malloc(struct md_s *sc, struct md_req *mdr) 1333 { 1334 uintptr_t sp; 1335 int error; 1336 off_t u; 1337 1338 error = 0; 1339 if (mdr->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 1340 return (EINVAL); 1341 if (mdr->md_sectorsize != 0 && !powerof2(mdr->md_sectorsize)) 1342 return (EINVAL); 1343 /* Compression doesn't make sense if we have reserved space */ 1344 if (mdr->md_options & MD_RESERVE) 1345 mdr->md_options &= ~MD_COMPRESS; 1346 if (mdr->md_fwsectors != 0) 1347 sc->fwsectors = mdr->md_fwsectors; 1348 if (mdr->md_fwheads != 0) 1349 sc->fwheads = mdr->md_fwheads; 1350 sc->flags = mdr->md_options & (MD_COMPRESS | MD_FORCE); 1351 sc->indir = dimension(sc->mediasize / sc->sectorsize); 1352 sc->uma = uma_zcreate(sc->name, sc->sectorsize, NULL, NULL, NULL, NULL, 1353 0x1ff, 0); 1354 if (mdr->md_options & MD_RESERVE) { 1355 off_t nsectors; 1356 1357 nsectors = sc->mediasize / sc->sectorsize; 1358 for (u = 0; u < nsectors; u++) { 1359 sp = (uintptr_t)uma_zalloc(sc->uma, (md_malloc_wait ? 1360 M_WAITOK : M_NOWAIT) | M_ZERO); 1361 if (sp != 0) 1362 error = s_write(sc->indir, u, sp); 1363 else 1364 error = ENOMEM; 1365 if (error != 0) 1366 break; 1367 } 1368 } 1369 return (error); 1370 } 1371 1372 static int 1373 mdsetcred(struct md_s *sc, struct ucred *cred) 1374 { 1375 char *tmpbuf; 1376 int error = 0; 1377 1378 /* 1379 * Set credits in our softc 1380 */ 1381 1382 if (sc->cred) 1383 crfree(sc->cred); 1384 sc->cred = crhold(cred); 1385 1386 /* 1387 * Horrible kludge to establish credentials for NFS XXX. 1388 */ 1389 1390 if (sc->vnode) { 1391 struct uio auio; 1392 struct iovec aiov; 1393 1394 tmpbuf = malloc(sc->sectorsize, M_TEMP, M_WAITOK); 1395 bzero(&auio, sizeof(auio)); 1396 1397 aiov.iov_base = tmpbuf; 1398 aiov.iov_len = sc->sectorsize; 1399 auio.uio_iov = &aiov; 1400 auio.uio_iovcnt = 1; 1401 auio.uio_offset = 0; 1402 auio.uio_rw = UIO_READ; 1403 auio.uio_segflg = UIO_SYSSPACE; 1404 auio.uio_resid = aiov.iov_len; 1405 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY); 1406 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 1407 VOP_UNLOCK(sc->vnode); 1408 free(tmpbuf, M_TEMP); 1409 } 1410 return (error); 1411 } 1412 1413 static int 1414 mdcreate_vnode(struct md_s *sc, struct md_req *mdr, struct thread *td) 1415 { 1416 struct vattr vattr; 1417 struct nameidata nd; 1418 char *fname; 1419 int error, flags; 1420 long v; 1421 1422 fname = mdr->md_file; 1423 if (mdr->md_file_seg == UIO_USERSPACE) { 1424 error = copyinstr(fname, sc->file, sizeof(sc->file), NULL); 1425 if (error != 0) 1426 return (error); 1427 } else if (mdr->md_file_seg == UIO_SYSSPACE) 1428 strlcpy(sc->file, fname, sizeof(sc->file)); 1429 else 1430 return (EDOOFUS); 1431 1432 /* 1433 * If the user specified that this is a read only device, don't 1434 * set the FWRITE mask before trying to open the backing store. 1435 */ 1436 flags = FREAD | ((mdr->md_options & MD_READONLY) ? 0 : FWRITE) \ 1437 | ((mdr->md_options & MD_VERIFY) ? O_VERIFY : 0); 1438 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, sc->file); 1439 error = vn_open(&nd, &flags, 0, NULL); 1440 if (error != 0) 1441 return (error); 1442 NDFREE_PNBUF(&nd); 1443 if (nd.ni_vp->v_type != VREG) { 1444 error = EINVAL; 1445 goto bad; 1446 } 1447 error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred); 1448 if (error != 0) 1449 goto bad; 1450 if ((mdr->md_options & MD_MUSTDEALLOC) != 0) { 1451 error = VOP_PATHCONF(nd.ni_vp, _PC_DEALLOC_PRESENT, &v); 1452 if (error != 0) 1453 goto bad; 1454 if (v == 0) 1455 sc->candelete = false; 1456 } 1457 if (VOP_ISLOCKED(nd.ni_vp) != LK_EXCLUSIVE) { 1458 vn_lock(nd.ni_vp, LK_UPGRADE | LK_RETRY); 1459 if (VN_IS_DOOMED(nd.ni_vp)) { 1460 /* Forced unmount. */ 1461 error = EBADF; 1462 goto bad; 1463 } 1464 } 1465 nd.ni_vp->v_vflag |= VV_MD; 1466 VOP_UNLOCK(nd.ni_vp); 1467 1468 if (mdr->md_fwsectors != 0) 1469 sc->fwsectors = mdr->md_fwsectors; 1470 if (mdr->md_fwheads != 0) 1471 sc->fwheads = mdr->md_fwheads; 1472 snprintf(sc->ident, sizeof(sc->ident), "MD-DEV%ju-INO%ju", 1473 (uintmax_t)vattr.va_fsid, (uintmax_t)vattr.va_fileid); 1474 sc->flags = mdr->md_options & (MD_ASYNC | MD_CACHE | MD_FORCE | 1475 MD_VERIFY); 1476 if (!(flags & FWRITE)) 1477 sc->flags |= MD_READONLY; 1478 sc->vnode = nd.ni_vp; 1479 1480 error = mdsetcred(sc, td->td_ucred); 1481 if (error != 0) { 1482 sc->vnode = NULL; 1483 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY); 1484 nd.ni_vp->v_vflag &= ~VV_MD; 1485 goto bad; 1486 } 1487 return (0); 1488 bad: 1489 VOP_UNLOCK(nd.ni_vp); 1490 (void)vn_close(nd.ni_vp, flags, td->td_ucred, td); 1491 return (error); 1492 } 1493 1494 static void 1495 g_md_providergone(struct g_provider *pp) 1496 { 1497 struct md_s *sc = pp->geom->softc; 1498 1499 mtx_lock(&sc->queue_mtx); 1500 sc->flags |= MD_PROVIDERGONE; 1501 wakeup(&sc->flags); 1502 mtx_unlock(&sc->queue_mtx); 1503 } 1504 1505 static int 1506 mddestroy(struct md_s *sc, struct thread *td) 1507 { 1508 1509 if (sc->gp) { 1510 g_topology_lock(); 1511 g_wither_geom(sc->gp, ENXIO); 1512 g_topology_unlock(); 1513 1514 mtx_lock(&sc->queue_mtx); 1515 while (!(sc->flags & MD_PROVIDERGONE)) 1516 msleep(&sc->flags, &sc->queue_mtx, PRIBIO, "mddestroy", 0); 1517 mtx_unlock(&sc->queue_mtx); 1518 } 1519 if (sc->devstat) { 1520 devstat_remove_entry(sc->devstat); 1521 sc->devstat = NULL; 1522 } 1523 mtx_lock(&sc->queue_mtx); 1524 sc->flags |= MD_SHUTDOWN; 1525 wakeup(sc); 1526 while (!(sc->flags & MD_EXITING)) 1527 msleep(sc->procp, &sc->queue_mtx, PRIBIO, "mddestroy", hz / 10); 1528 mtx_unlock(&sc->queue_mtx); 1529 mtx_destroy(&sc->queue_mtx); 1530 if (sc->vnode != NULL) { 1531 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY); 1532 sc->vnode->v_vflag &= ~VV_MD; 1533 VOP_UNLOCK(sc->vnode); 1534 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 1535 FREAD : (FREAD|FWRITE), sc->cred, td); 1536 } 1537 if (sc->cred != NULL) 1538 crfree(sc->cred); 1539 if (sc->object != NULL) 1540 vm_object_deallocate(sc->object); 1541 if (sc->indir) 1542 destroy_indir(sc, sc->indir); 1543 if (sc->uma) 1544 uma_zdestroy(sc->uma); 1545 1546 LIST_REMOVE(sc, list); 1547 free_unr(md_uh, sc->unit); 1548 free(sc, M_MD); 1549 return (0); 1550 } 1551 1552 static int 1553 mdresize(struct md_s *sc, struct md_req *mdr) 1554 { 1555 int error, res; 1556 vm_pindex_t oldpages, newpages; 1557 1558 switch (sc->type) { 1559 case MD_VNODE: 1560 case MD_NULL: 1561 break; 1562 case MD_SWAP: 1563 if (mdr->md_mediasize <= 0 || 1564 (mdr->md_mediasize % PAGE_SIZE) != 0) 1565 return (EDOM); 1566 oldpages = OFF_TO_IDX(sc->mediasize); 1567 newpages = OFF_TO_IDX(mdr->md_mediasize); 1568 if (newpages < oldpages) { 1569 VM_OBJECT_WLOCK(sc->object); 1570 vm_object_page_remove(sc->object, newpages, 0, 0); 1571 swap_release_by_cred(IDX_TO_OFF(oldpages - 1572 newpages), sc->cred); 1573 sc->object->charge = IDX_TO_OFF(newpages); 1574 sc->object->size = newpages; 1575 VM_OBJECT_WUNLOCK(sc->object); 1576 } else if (newpages > oldpages) { 1577 res = swap_reserve_by_cred(IDX_TO_OFF(newpages - 1578 oldpages), sc->cred); 1579 if (!res) 1580 return (ENOMEM); 1581 if ((mdr->md_options & MD_RESERVE) || 1582 (sc->flags & MD_RESERVE)) { 1583 error = swap_pager_reserve(sc->object, 1584 oldpages, newpages - oldpages); 1585 if (error < 0) { 1586 swap_release_by_cred( 1587 IDX_TO_OFF(newpages - oldpages), 1588 sc->cred); 1589 return (EDOM); 1590 } 1591 } 1592 VM_OBJECT_WLOCK(sc->object); 1593 sc->object->charge = IDX_TO_OFF(newpages); 1594 sc->object->size = newpages; 1595 VM_OBJECT_WUNLOCK(sc->object); 1596 } 1597 break; 1598 default: 1599 return (EOPNOTSUPP); 1600 } 1601 1602 sc->mediasize = mdr->md_mediasize; 1603 1604 g_topology_lock(); 1605 g_resize_provider(sc->pp, sc->mediasize); 1606 g_topology_unlock(); 1607 return (0); 1608 } 1609 1610 static int 1611 mdcreate_swap(struct md_s *sc, struct md_req *mdr, struct thread *td) 1612 { 1613 vm_ooffset_t npage; 1614 int error; 1615 1616 /* 1617 * Range check. Disallow negative sizes and sizes not being 1618 * multiple of page size. 1619 */ 1620 if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0) 1621 return (EDOM); 1622 1623 /* 1624 * Allocate an OBJT_SWAP object. 1625 * 1626 * Note the truncation. 1627 */ 1628 1629 if ((mdr->md_options & MD_VERIFY) != 0) 1630 return (EINVAL); 1631 npage = mdr->md_mediasize / PAGE_SIZE; 1632 if (mdr->md_fwsectors != 0) 1633 sc->fwsectors = mdr->md_fwsectors; 1634 if (mdr->md_fwheads != 0) 1635 sc->fwheads = mdr->md_fwheads; 1636 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * npage, 1637 VM_PROT_DEFAULT, 0, td->td_ucred); 1638 if (sc->object == NULL) 1639 return (ENOMEM); 1640 sc->flags = mdr->md_options & (MD_FORCE | MD_RESERVE); 1641 if (mdr->md_options & MD_RESERVE) { 1642 if (swap_pager_reserve(sc->object, 0, npage) < 0) { 1643 error = EDOM; 1644 goto finish; 1645 } 1646 } 1647 error = mdsetcred(sc, td->td_ucred); 1648 finish: 1649 if (error != 0) { 1650 vm_object_deallocate(sc->object); 1651 sc->object = NULL; 1652 } 1653 return (error); 1654 } 1655 1656 static int 1657 mdcreate_null(struct md_s *sc, struct md_req *mdr, struct thread *td) 1658 { 1659 1660 /* 1661 * Range check. Disallow negative sizes and sizes not being 1662 * multiple of page size. 1663 */ 1664 if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0) 1665 return (EDOM); 1666 1667 return (0); 1668 } 1669 1670 static int 1671 kern_mdattach_locked(struct thread *td, struct md_req *mdr) 1672 { 1673 struct md_s *sc; 1674 unsigned sectsize; 1675 int error, i; 1676 1677 sx_assert(&md_sx, SA_XLOCKED); 1678 1679 switch (mdr->md_type) { 1680 case MD_MALLOC: 1681 case MD_PRELOAD: 1682 case MD_VNODE: 1683 case MD_SWAP: 1684 case MD_NULL: 1685 break; 1686 default: 1687 return (EINVAL); 1688 } 1689 if (mdr->md_sectorsize == 0) 1690 sectsize = DEV_BSIZE; 1691 else 1692 sectsize = mdr->md_sectorsize; 1693 if (sectsize > maxphys || mdr->md_mediasize < sectsize) 1694 return (EINVAL); 1695 if (mdr->md_options & MD_AUTOUNIT) 1696 sc = mdnew(-1, &error, mdr->md_type); 1697 else { 1698 if (mdr->md_unit > INT_MAX) 1699 return (EINVAL); 1700 sc = mdnew(mdr->md_unit, &error, mdr->md_type); 1701 } 1702 if (sc == NULL) 1703 return (error); 1704 if (mdr->md_label != NULL) 1705 error = copyinstr(mdr->md_label, sc->label, 1706 sizeof(sc->label), NULL); 1707 if (error != 0) 1708 goto err_after_new; 1709 if (mdr->md_options & MD_AUTOUNIT) 1710 mdr->md_unit = sc->unit; 1711 sc->mediasize = mdr->md_mediasize; 1712 sc->sectorsize = sectsize; 1713 sc->candelete = true; 1714 error = EDOOFUS; 1715 switch (sc->type) { 1716 case MD_MALLOC: 1717 sc->start = mdstart_malloc; 1718 error = mdcreate_malloc(sc, mdr); 1719 break; 1720 case MD_PRELOAD: 1721 /* 1722 * We disallow attaching preloaded memory disks via 1723 * ioctl. Preloaded memory disks are automatically 1724 * attached in g_md_init(). 1725 */ 1726 error = EOPNOTSUPP; 1727 break; 1728 case MD_VNODE: 1729 sc->start = mdstart_vnode; 1730 error = mdcreate_vnode(sc, mdr, td); 1731 break; 1732 case MD_SWAP: 1733 sc->start = mdstart_swap; 1734 error = mdcreate_swap(sc, mdr, td); 1735 break; 1736 case MD_NULL: 1737 sc->start = mdstart_null; 1738 error = mdcreate_null(sc, mdr, td); 1739 break; 1740 } 1741 err_after_new: 1742 if (error != 0) { 1743 mddestroy(sc, td); 1744 return (error); 1745 } 1746 1747 /* Prune off any residual fractional sector */ 1748 i = sc->mediasize % sc->sectorsize; 1749 sc->mediasize -= i; 1750 1751 mdinit(sc); 1752 return (0); 1753 } 1754 1755 static int 1756 kern_mdattach(struct thread *td, struct md_req *mdr) 1757 { 1758 int error; 1759 1760 sx_xlock(&md_sx); 1761 error = kern_mdattach_locked(td, mdr); 1762 sx_xunlock(&md_sx); 1763 return (error); 1764 } 1765 1766 static int 1767 kern_mddetach_locked(struct thread *td, struct md_req *mdr) 1768 { 1769 struct md_s *sc; 1770 1771 sx_assert(&md_sx, SA_XLOCKED); 1772 1773 if (mdr->md_mediasize != 0 || 1774 (mdr->md_options & ~MD_FORCE) != 0) 1775 return (EINVAL); 1776 1777 sc = mdfind(mdr->md_unit); 1778 if (sc == NULL) 1779 return (ENOENT); 1780 if (sc->opencount != 0 && !(sc->flags & MD_FORCE) && 1781 !(mdr->md_options & MD_FORCE)) 1782 return (EBUSY); 1783 return (mddestroy(sc, td)); 1784 } 1785 1786 static int 1787 kern_mddetach(struct thread *td, struct md_req *mdr) 1788 { 1789 int error; 1790 1791 sx_xlock(&md_sx); 1792 error = kern_mddetach_locked(td, mdr); 1793 sx_xunlock(&md_sx); 1794 return (error); 1795 } 1796 1797 static int 1798 kern_mdresize_locked(struct md_req *mdr) 1799 { 1800 struct md_s *sc; 1801 1802 sx_assert(&md_sx, SA_XLOCKED); 1803 1804 if ((mdr->md_options & ~(MD_FORCE | MD_RESERVE)) != 0) 1805 return (EINVAL); 1806 1807 sc = mdfind(mdr->md_unit); 1808 if (sc == NULL) 1809 return (ENOENT); 1810 if (mdr->md_mediasize < sc->sectorsize) 1811 return (EINVAL); 1812 mdr->md_mediasize -= mdr->md_mediasize % sc->sectorsize; 1813 if (mdr->md_mediasize < sc->mediasize && 1814 !(sc->flags & MD_FORCE) && 1815 !(mdr->md_options & MD_FORCE)) 1816 return (EBUSY); 1817 return (mdresize(sc, mdr)); 1818 } 1819 1820 static int 1821 kern_mdresize(struct md_req *mdr) 1822 { 1823 int error; 1824 1825 sx_xlock(&md_sx); 1826 error = kern_mdresize_locked(mdr); 1827 sx_xunlock(&md_sx); 1828 return (error); 1829 } 1830 1831 static int 1832 kern_mdquery_locked(struct md_req *mdr) 1833 { 1834 struct md_s *sc; 1835 int error; 1836 1837 sx_assert(&md_sx, SA_XLOCKED); 1838 1839 sc = mdfind(mdr->md_unit); 1840 if (sc == NULL) 1841 return (ENOENT); 1842 mdr->md_type = sc->type; 1843 mdr->md_options = sc->flags; 1844 mdr->md_mediasize = sc->mediasize; 1845 mdr->md_sectorsize = sc->sectorsize; 1846 error = 0; 1847 if (mdr->md_label != NULL) { 1848 error = copyout(sc->label, mdr->md_label, 1849 strlen(sc->label) + 1); 1850 if (error != 0) 1851 return (error); 1852 } 1853 if (sc->type == MD_VNODE || 1854 (sc->type == MD_PRELOAD && mdr->md_file != NULL)) 1855 error = copyout(sc->file, mdr->md_file, 1856 strlen(sc->file) + 1); 1857 return (error); 1858 } 1859 1860 static int 1861 kern_mdquery(struct md_req *mdr) 1862 { 1863 int error; 1864 1865 sx_xlock(&md_sx); 1866 error = kern_mdquery_locked(mdr); 1867 sx_xunlock(&md_sx); 1868 return (error); 1869 } 1870 1871 /* Copy members that are not userspace pointers. */ 1872 #define MD_IOCTL2REQ(mdio, mdr) do { \ 1873 (mdr)->md_unit = (mdio)->md_unit; \ 1874 (mdr)->md_type = (mdio)->md_type; \ 1875 (mdr)->md_mediasize = (mdio)->md_mediasize; \ 1876 (mdr)->md_sectorsize = (mdio)->md_sectorsize; \ 1877 (mdr)->md_options = (mdio)->md_options; \ 1878 (mdr)->md_fwheads = (mdio)->md_fwheads; \ 1879 (mdr)->md_fwsectors = (mdio)->md_fwsectors; \ 1880 (mdr)->md_units = &(mdio)->md_pad[0]; \ 1881 (mdr)->md_units_nitems = nitems((mdio)->md_pad); \ 1882 } while(0) 1883 1884 /* Copy members that might have been updated */ 1885 #define MD_REQ2IOCTL(mdr, mdio) do { \ 1886 (mdio)->md_unit = (mdr)->md_unit; \ 1887 (mdio)->md_type = (mdr)->md_type; \ 1888 (mdio)->md_mediasize = (mdr)->md_mediasize; \ 1889 (mdio)->md_sectorsize = (mdr)->md_sectorsize; \ 1890 (mdio)->md_options = (mdr)->md_options; \ 1891 (mdio)->md_fwheads = (mdr)->md_fwheads; \ 1892 (mdio)->md_fwsectors = (mdr)->md_fwsectors; \ 1893 } while(0) 1894 1895 static int 1896 mdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, 1897 struct thread *td) 1898 { 1899 struct md_req mdr; 1900 int error; 1901 1902 if (md_debug) 1903 printf("mdctlioctl(%s %lx %p %x %p)\n", 1904 devtoname(dev), cmd, addr, flags, td); 1905 1906 bzero(&mdr, sizeof(mdr)); 1907 switch (cmd) { 1908 case MDIOCATTACH: 1909 case MDIOCDETACH: 1910 case MDIOCRESIZE: 1911 case MDIOCQUERY: { 1912 struct md_ioctl *mdio = (struct md_ioctl *)addr; 1913 if (mdio->md_version != MDIOVERSION) 1914 return (EINVAL); 1915 MD_IOCTL2REQ(mdio, &mdr); 1916 mdr.md_file = mdio->md_file; 1917 mdr.md_file_seg = UIO_USERSPACE; 1918 /* If the file is adjacent to the md_ioctl it's in kernel. */ 1919 if ((void *)mdio->md_file == (void *)(mdio + 1)) 1920 mdr.md_file_seg = UIO_SYSSPACE; 1921 mdr.md_label = mdio->md_label; 1922 break; 1923 } 1924 #ifdef COMPAT_FREEBSD32 1925 case MDIOCATTACH_32: 1926 case MDIOCDETACH_32: 1927 case MDIOCRESIZE_32: 1928 case MDIOCQUERY_32: { 1929 struct md_ioctl32 *mdio = (struct md_ioctl32 *)addr; 1930 if (mdio->md_version != MDIOVERSION) 1931 return (EINVAL); 1932 MD_IOCTL2REQ(mdio, &mdr); 1933 mdr.md_file = (void *)(uintptr_t)mdio->md_file; 1934 mdr.md_file_seg = UIO_USERSPACE; 1935 mdr.md_label = (void *)(uintptr_t)mdio->md_label; 1936 break; 1937 } 1938 #endif 1939 default: 1940 /* Fall through to handler switch. */ 1941 break; 1942 } 1943 1944 error = 0; 1945 switch (cmd) { 1946 case MDIOCATTACH: 1947 #ifdef COMPAT_FREEBSD32 1948 case MDIOCATTACH_32: 1949 #endif 1950 error = kern_mdattach(td, &mdr); 1951 break; 1952 case MDIOCDETACH: 1953 #ifdef COMPAT_FREEBSD32 1954 case MDIOCDETACH_32: 1955 #endif 1956 error = kern_mddetach(td, &mdr); 1957 break; 1958 case MDIOCRESIZE: 1959 #ifdef COMPAT_FREEBSD32 1960 case MDIOCRESIZE_32: 1961 #endif 1962 error = kern_mdresize(&mdr); 1963 break; 1964 case MDIOCQUERY: 1965 #ifdef COMPAT_FREEBSD32 1966 case MDIOCQUERY_32: 1967 #endif 1968 error = kern_mdquery(&mdr); 1969 break; 1970 default: 1971 error = ENOIOCTL; 1972 } 1973 1974 switch (cmd) { 1975 case MDIOCATTACH: 1976 case MDIOCQUERY: { 1977 struct md_ioctl *mdio = (struct md_ioctl *)addr; 1978 MD_REQ2IOCTL(&mdr, mdio); 1979 break; 1980 } 1981 #ifdef COMPAT_FREEBSD32 1982 case MDIOCATTACH_32: 1983 case MDIOCQUERY_32: { 1984 struct md_ioctl32 *mdio = (struct md_ioctl32 *)addr; 1985 MD_REQ2IOCTL(&mdr, mdio); 1986 break; 1987 } 1988 #endif 1989 default: 1990 /* Other commands to not alter mdr. */ 1991 break; 1992 } 1993 1994 return (error); 1995 } 1996 1997 static void 1998 md_preloaded(u_char *image, size_t length, const char *name) 1999 { 2000 struct md_s *sc; 2001 int error; 2002 2003 sc = mdnew(-1, &error, MD_PRELOAD); 2004 if (sc == NULL) 2005 return; 2006 sc->mediasize = length; 2007 sc->sectorsize = DEV_BSIZE; 2008 sc->pl_ptr = image; 2009 sc->pl_len = length; 2010 sc->start = mdstart_preload; 2011 if (name != NULL) 2012 strlcpy(sc->file, name, sizeof(sc->file)); 2013 #ifdef MD_ROOT 2014 if (sc->unit == 0) { 2015 #ifndef ROOTDEVNAME 2016 rootdevnames[0] = MD_ROOT_FSTYPE ":/dev/md0"; 2017 #endif 2018 #ifdef MD_ROOT_READONLY 2019 sc->flags |= MD_READONLY; 2020 #endif 2021 } 2022 #endif 2023 mdinit(sc); 2024 if (name != NULL) { 2025 printf("%s%d: Preloaded image <%s> %zd bytes at %p\n", 2026 MD_NAME, sc->unit, name, length, image); 2027 } else { 2028 printf("%s%d: Embedded image %zd bytes at %p\n", 2029 MD_NAME, sc->unit, length, image); 2030 } 2031 } 2032 2033 static void 2034 g_md_init(struct g_class *mp __unused) 2035 { 2036 caddr_t mod; 2037 u_char *ptr, *name, *type; 2038 unsigned len; 2039 int i; 2040 2041 /* figure out log2(NINDIR) */ 2042 for (i = NINDIR, nshift = -1; i; nshift++) 2043 i >>= 1; 2044 2045 mod = NULL; 2046 sx_init(&md_sx, "MD config lock"); 2047 g_topology_unlock(); 2048 md_uh = new_unrhdr(0, INT_MAX, NULL); 2049 #ifdef MD_ROOT 2050 if (mfs_root_size != 0) { 2051 sx_xlock(&md_sx); 2052 #ifdef MD_ROOT_MEM 2053 md_preloaded(mfs_root, mfs_root_size, NULL); 2054 #else 2055 md_preloaded(__DEVOLATILE(u_char *, &mfs_root), mfs_root_size, 2056 NULL); 2057 #endif 2058 sx_xunlock(&md_sx); 2059 } 2060 #endif 2061 /* XXX: are preload_* static or do they need Giant ? */ 2062 while ((mod = preload_search_next_name(mod)) != NULL) { 2063 name = (char *)preload_search_info(mod, MODINFO_NAME); 2064 if (name == NULL) 2065 continue; 2066 type = (char *)preload_search_info(mod, MODINFO_TYPE); 2067 if (type == NULL) 2068 continue; 2069 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 2070 continue; 2071 ptr = preload_fetch_addr(mod); 2072 len = preload_fetch_size(mod); 2073 if (ptr != NULL && len != 0) { 2074 sx_xlock(&md_sx); 2075 md_preloaded(ptr, len, name); 2076 sx_xunlock(&md_sx); 2077 } 2078 } 2079 md_pbuf_zone = pbuf_zsecond_create("mdpbuf", nswbuf / 10); 2080 status_dev = make_dev(&mdctl_cdevsw, INT_MAX, UID_ROOT, GID_WHEEL, 2081 0600, MDCTL_NAME); 2082 g_topology_lock(); 2083 } 2084 2085 static void 2086 g_md_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 2087 struct g_consumer *cp __unused, struct g_provider *pp) 2088 { 2089 struct md_s *mp; 2090 char *type; 2091 2092 mp = gp->softc; 2093 if (mp == NULL) 2094 return; 2095 2096 switch (mp->type) { 2097 case MD_MALLOC: 2098 type = "malloc"; 2099 break; 2100 case MD_PRELOAD: 2101 type = "preload"; 2102 break; 2103 case MD_VNODE: 2104 type = "vnode"; 2105 break; 2106 case MD_SWAP: 2107 type = "swap"; 2108 break; 2109 case MD_NULL: 2110 type = "null"; 2111 break; 2112 default: 2113 type = "unknown"; 2114 break; 2115 } 2116 2117 if (pp != NULL) { 2118 if (indent == NULL) { 2119 sbuf_printf(sb, " u %d", mp->unit); 2120 sbuf_printf(sb, " s %ju", (uintmax_t) mp->sectorsize); 2121 sbuf_printf(sb, " f %ju", (uintmax_t) mp->fwheads); 2122 sbuf_printf(sb, " fs %ju", (uintmax_t) mp->fwsectors); 2123 sbuf_printf(sb, " l %ju", (uintmax_t) mp->mediasize); 2124 sbuf_printf(sb, " t %s", type); 2125 if ((mp->type == MD_VNODE && mp->vnode != NULL) || 2126 (mp->type == MD_PRELOAD && mp->file[0] != '\0')) 2127 sbuf_printf(sb, " file %s", mp->file); 2128 sbuf_printf(sb, " label %s", mp->label); 2129 } else { 2130 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent, 2131 mp->unit); 2132 sbuf_printf(sb, "%s<sectorsize>%ju</sectorsize>\n", 2133 indent, (uintmax_t) mp->sectorsize); 2134 sbuf_printf(sb, "%s<fwheads>%ju</fwheads>\n", 2135 indent, (uintmax_t) mp->fwheads); 2136 sbuf_printf(sb, "%s<fwsectors>%ju</fwsectors>\n", 2137 indent, (uintmax_t) mp->fwsectors); 2138 if (mp->ident[0] != '\0') { 2139 sbuf_printf(sb, "%s<ident>", indent); 2140 g_conf_printf_escaped(sb, "%s", mp->ident); 2141 sbuf_printf(sb, "</ident>\n"); 2142 } 2143 sbuf_printf(sb, "%s<length>%ju</length>\n", 2144 indent, (uintmax_t) mp->mediasize); 2145 sbuf_printf(sb, "%s<compression>%s</compression>\n", indent, 2146 (mp->flags & MD_COMPRESS) == 0 ? "off": "on"); 2147 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 2148 (mp->flags & MD_READONLY) == 0 ? "read-write": 2149 "read-only"); 2150 sbuf_printf(sb, "%s<type>%s</type>\n", indent, 2151 type); 2152 if ((mp->type == MD_VNODE && mp->vnode != NULL) || 2153 (mp->type == MD_PRELOAD && mp->file[0] != '\0')) { 2154 sbuf_printf(sb, "%s<file>", indent); 2155 g_conf_printf_escaped(sb, "%s", mp->file); 2156 sbuf_printf(sb, "</file>\n"); 2157 } 2158 if (mp->type == MD_VNODE) 2159 sbuf_printf(sb, "%s<cache>%s</cache>\n", indent, 2160 (mp->flags & MD_CACHE) == 0 ? "off": "on"); 2161 sbuf_printf(sb, "%s<label>", indent); 2162 g_conf_printf_escaped(sb, "%s", mp->label); 2163 sbuf_printf(sb, "</label>\n"); 2164 } 2165 } 2166 } 2167 2168 static void 2169 g_md_fini(struct g_class *mp __unused) 2170 { 2171 2172 sx_destroy(&md_sx); 2173 if (status_dev != NULL) 2174 destroy_dev(status_dev); 2175 uma_zdestroy(md_pbuf_zone); 2176 delete_unrhdr(md_uh); 2177 }
Cache object: 173d8cff8d9f205f7751f5f42896c558
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