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 #define mfs_root_size ((uintptr_t)(&mfs_root_end - &mfs_root)) 191 #endif 192 #endif 193 194 static g_init_t g_md_init; 195 static g_fini_t g_md_fini; 196 static g_start_t g_md_start; 197 static g_access_t g_md_access; 198 static void g_md_dumpconf(struct sbuf *sb, const char *indent, 199 struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp); 200 static g_provgone_t g_md_providergone; 201 202 static struct cdev *status_dev = NULL; 203 static struct sx md_sx; 204 static struct unrhdr *md_uh; 205 206 static d_ioctl_t mdctlioctl; 207 208 static struct cdevsw mdctl_cdevsw = { 209 .d_version = D_VERSION, 210 .d_ioctl = mdctlioctl, 211 .d_name = MD_NAME, 212 }; 213 214 struct g_class g_md_class = { 215 .name = "MD", 216 .version = G_VERSION, 217 .init = g_md_init, 218 .fini = g_md_fini, 219 .start = g_md_start, 220 .access = g_md_access, 221 .dumpconf = g_md_dumpconf, 222 .providergone = g_md_providergone, 223 }; 224 225 DECLARE_GEOM_CLASS(g_md_class, g_md); 226 MODULE_VERSION(geom_md, 0); 227 228 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(md_softc_list); 229 230 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 231 #define NMASK (NINDIR-1) 232 static int nshift; 233 234 static uma_zone_t md_pbuf_zone; 235 236 struct indir { 237 uintptr_t *array; 238 u_int total; 239 u_int used; 240 u_int shift; 241 }; 242 243 struct md_s { 244 int unit; 245 LIST_ENTRY(md_s) list; 246 struct bio_queue_head bio_queue; 247 struct mtx queue_mtx; 248 struct cdev *dev; 249 enum md_types type; 250 off_t mediasize; 251 unsigned sectorsize; 252 unsigned opencount; 253 unsigned fwheads; 254 unsigned fwsectors; 255 char ident[32]; 256 unsigned flags; 257 char name[20]; 258 struct proc *procp; 259 struct g_geom *gp; 260 struct g_provider *pp; 261 int (*start)(struct md_s *sc, struct bio *bp); 262 struct devstat *devstat; 263 264 /* MD_MALLOC related fields */ 265 struct indir *indir; 266 uma_zone_t uma; 267 268 /* MD_PRELOAD related fields */ 269 u_char *pl_ptr; 270 size_t pl_len; 271 272 /* MD_VNODE related fields */ 273 struct vnode *vnode; 274 char file[PATH_MAX]; 275 char label[PATH_MAX]; 276 struct ucred *cred; 277 278 /* MD_SWAP related fields */ 279 vm_object_t object; 280 }; 281 282 static struct indir * 283 new_indir(u_int shift) 284 { 285 struct indir *ip; 286 287 ip = malloc(sizeof *ip, M_MD, (md_malloc_wait ? M_WAITOK : M_NOWAIT) 288 | M_ZERO); 289 if (ip == NULL) 290 return (NULL); 291 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 292 M_MDSECT, (md_malloc_wait ? M_WAITOK : M_NOWAIT) | M_ZERO); 293 if (ip->array == NULL) { 294 free(ip, M_MD); 295 return (NULL); 296 } 297 ip->total = NINDIR; 298 ip->shift = shift; 299 return (ip); 300 } 301 302 static void 303 del_indir(struct indir *ip) 304 { 305 306 free(ip->array, M_MDSECT); 307 free(ip, M_MD); 308 } 309 310 static void 311 destroy_indir(struct md_s *sc, struct indir *ip) 312 { 313 int i; 314 315 for (i = 0; i < NINDIR; i++) { 316 if (!ip->array[i]) 317 continue; 318 if (ip->shift) 319 destroy_indir(sc, (struct indir*)(ip->array[i])); 320 else if (ip->array[i] > 255) 321 uma_zfree(sc->uma, (void *)(ip->array[i])); 322 } 323 del_indir(ip); 324 } 325 326 /* 327 * This function does the math and allocates the top level "indir" structure 328 * for a device of "size" sectors. 329 */ 330 331 static struct indir * 332 dimension(off_t size) 333 { 334 off_t rcnt; 335 struct indir *ip; 336 int layer; 337 338 rcnt = size; 339 layer = 0; 340 while (rcnt > NINDIR) { 341 rcnt /= NINDIR; 342 layer++; 343 } 344 345 /* 346 * XXX: the top layer is probably not fully populated, so we allocate 347 * too much space for ip->array in here. 348 */ 349 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO); 350 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 351 M_MDSECT, M_WAITOK | M_ZERO); 352 ip->total = NINDIR; 353 ip->shift = layer * nshift; 354 return (ip); 355 } 356 357 /* 358 * Read a given sector 359 */ 360 361 static uintptr_t 362 s_read(struct indir *ip, off_t offset) 363 { 364 struct indir *cip; 365 int idx; 366 uintptr_t up; 367 368 if (md_debug > 1) 369 printf("s_read(%jd)\n", (intmax_t)offset); 370 up = 0; 371 for (cip = ip; cip != NULL;) { 372 if (cip->shift) { 373 idx = (offset >> cip->shift) & NMASK; 374 up = cip->array[idx]; 375 cip = (struct indir *)up; 376 continue; 377 } 378 idx = offset & NMASK; 379 return (cip->array[idx]); 380 } 381 return (0); 382 } 383 384 /* 385 * Write a given sector, prune the tree if the value is 0 386 */ 387 388 static int 389 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 390 { 391 struct indir *cip, *lip[10]; 392 int idx, li; 393 uintptr_t up; 394 395 if (md_debug > 1) 396 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 397 up = 0; 398 li = 0; 399 cip = ip; 400 for (;;) { 401 lip[li++] = cip; 402 if (cip->shift) { 403 idx = (offset >> cip->shift) & NMASK; 404 up = cip->array[idx]; 405 if (up != 0) { 406 cip = (struct indir *)up; 407 continue; 408 } 409 /* Allocate branch */ 410 cip->array[idx] = 411 (uintptr_t)new_indir(cip->shift - nshift); 412 if (cip->array[idx] == 0) 413 return (ENOSPC); 414 cip->used++; 415 up = cip->array[idx]; 416 cip = (struct indir *)up; 417 continue; 418 } 419 /* leafnode */ 420 idx = offset & NMASK; 421 up = cip->array[idx]; 422 if (up != 0) 423 cip->used--; 424 cip->array[idx] = ptr; 425 if (ptr != 0) 426 cip->used++; 427 break; 428 } 429 if (cip->used != 0 || li == 1) 430 return (0); 431 li--; 432 while (cip->used == 0 && cip != ip) { 433 li--; 434 idx = (offset >> lip[li]->shift) & NMASK; 435 up = lip[li]->array[idx]; 436 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 437 del_indir(cip); 438 lip[li]->array[idx] = 0; 439 lip[li]->used--; 440 cip = lip[li]; 441 } 442 return (0); 443 } 444 445 static int 446 g_md_access(struct g_provider *pp, int r, int w, int e) 447 { 448 struct md_s *sc; 449 450 sc = pp->geom->softc; 451 if (sc == NULL) { 452 if (r <= 0 && w <= 0 && e <= 0) 453 return (0); 454 return (ENXIO); 455 } 456 r += pp->acr; 457 w += pp->acw; 458 e += pp->ace; 459 if ((sc->flags & MD_READONLY) != 0 && w > 0) 460 return (EROFS); 461 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 462 sc->opencount = 1; 463 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 464 sc->opencount = 0; 465 } 466 return (0); 467 } 468 469 static void 470 g_md_start(struct bio *bp) 471 { 472 struct md_s *sc; 473 474 sc = bp->bio_to->geom->softc; 475 if ((bp->bio_cmd == BIO_READ) || (bp->bio_cmd == BIO_WRITE)) { 476 devstat_start_transaction_bio(sc->devstat, bp); 477 } 478 mtx_lock(&sc->queue_mtx); 479 bioq_disksort(&sc->bio_queue, bp); 480 wakeup(sc); 481 mtx_unlock(&sc->queue_mtx); 482 } 483 484 #define MD_MALLOC_MOVE_ZERO 1 485 #define MD_MALLOC_MOVE_FILL 2 486 #define MD_MALLOC_MOVE_READ 3 487 #define MD_MALLOC_MOVE_WRITE 4 488 #define MD_MALLOC_MOVE_CMP 5 489 490 static int 491 md_malloc_move_ma(vm_page_t **mp, int *ma_offs, unsigned sectorsize, 492 void *ptr, u_char fill, int op) 493 { 494 struct sf_buf *sf; 495 vm_page_t m, *mp1; 496 char *p, first; 497 off_t *uc; 498 unsigned n; 499 int error, i, ma_offs1, sz, first_read; 500 501 m = NULL; 502 error = 0; 503 sf = NULL; 504 /* if (op == MD_MALLOC_MOVE_CMP) { gcc */ 505 first = 0; 506 first_read = 0; 507 uc = ptr; 508 mp1 = *mp; 509 ma_offs1 = *ma_offs; 510 /* } */ 511 sched_pin(); 512 for (n = sectorsize; n != 0; n -= sz) { 513 sz = imin(PAGE_SIZE - *ma_offs, n); 514 if (m != **mp) { 515 if (sf != NULL) 516 sf_buf_free(sf); 517 m = **mp; 518 sf = sf_buf_alloc(m, SFB_CPUPRIVATE | 519 (md_malloc_wait ? 0 : SFB_NOWAIT)); 520 if (sf == NULL) { 521 error = ENOMEM; 522 break; 523 } 524 } 525 p = (char *)sf_buf_kva(sf) + *ma_offs; 526 switch (op) { 527 case MD_MALLOC_MOVE_ZERO: 528 bzero(p, sz); 529 break; 530 case MD_MALLOC_MOVE_FILL: 531 memset(p, fill, sz); 532 break; 533 case MD_MALLOC_MOVE_READ: 534 bcopy(ptr, p, sz); 535 cpu_flush_dcache(p, sz); 536 break; 537 case MD_MALLOC_MOVE_WRITE: 538 bcopy(p, ptr, sz); 539 break; 540 case MD_MALLOC_MOVE_CMP: 541 for (i = 0; i < sz; i++, p++) { 542 if (!first_read) { 543 *uc = (u_char)*p; 544 first = *p; 545 first_read = 1; 546 } else if (*p != first) { 547 error = EDOOFUS; 548 break; 549 } 550 } 551 break; 552 default: 553 KASSERT(0, ("md_malloc_move_ma unknown op %d\n", op)); 554 break; 555 } 556 if (error != 0) 557 break; 558 *ma_offs += sz; 559 *ma_offs %= PAGE_SIZE; 560 if (*ma_offs == 0) 561 (*mp)++; 562 ptr = (char *)ptr + sz; 563 } 564 565 if (sf != NULL) 566 sf_buf_free(sf); 567 sched_unpin(); 568 if (op == MD_MALLOC_MOVE_CMP && error != 0) { 569 *mp = mp1; 570 *ma_offs = ma_offs1; 571 } 572 return (error); 573 } 574 575 static int 576 md_malloc_move_vlist(bus_dma_segment_t **pvlist, int *pma_offs, 577 unsigned len, void *ptr, u_char fill, int op) 578 { 579 bus_dma_segment_t *vlist; 580 uint8_t *p, *end, first; 581 off_t *uc; 582 int ma_offs, seg_len; 583 584 vlist = *pvlist; 585 ma_offs = *pma_offs; 586 uc = ptr; 587 588 for (; len != 0; len -= seg_len) { 589 seg_len = imin(vlist->ds_len - ma_offs, len); 590 p = (uint8_t *)(uintptr_t)vlist->ds_addr + ma_offs; 591 switch (op) { 592 case MD_MALLOC_MOVE_ZERO: 593 bzero(p, seg_len); 594 break; 595 case MD_MALLOC_MOVE_FILL: 596 memset(p, fill, seg_len); 597 break; 598 case MD_MALLOC_MOVE_READ: 599 bcopy(ptr, p, seg_len); 600 cpu_flush_dcache(p, seg_len); 601 break; 602 case MD_MALLOC_MOVE_WRITE: 603 bcopy(p, ptr, seg_len); 604 break; 605 case MD_MALLOC_MOVE_CMP: 606 end = p + seg_len; 607 first = *uc = *p; 608 /* Confirm all following bytes match the first */ 609 while (++p < end) { 610 if (*p != first) 611 return (EDOOFUS); 612 } 613 break; 614 default: 615 KASSERT(0, ("md_malloc_move_vlist unknown op %d\n", op)); 616 break; 617 } 618 619 ma_offs += seg_len; 620 if (ma_offs == vlist->ds_len) { 621 ma_offs = 0; 622 vlist++; 623 } 624 ptr = (uint8_t *)ptr + seg_len; 625 } 626 *pvlist = vlist; 627 *pma_offs = ma_offs; 628 629 return (0); 630 } 631 632 static int 633 mdstart_malloc(struct md_s *sc, struct bio *bp) 634 { 635 u_char *dst; 636 vm_page_t *m; 637 bus_dma_segment_t *vlist; 638 int i, error, error1, ma_offs, notmapped; 639 off_t secno, nsec, uc; 640 uintptr_t sp, osp; 641 642 switch (bp->bio_cmd) { 643 case BIO_READ: 644 case BIO_WRITE: 645 case BIO_DELETE: 646 break; 647 case BIO_FLUSH: 648 return (0); 649 default: 650 return (EOPNOTSUPP); 651 } 652 653 notmapped = (bp->bio_flags & BIO_UNMAPPED) != 0; 654 vlist = (bp->bio_flags & BIO_VLIST) != 0 ? 655 (bus_dma_segment_t *)bp->bio_data : NULL; 656 if (notmapped) { 657 m = bp->bio_ma; 658 ma_offs = bp->bio_ma_offset; 659 dst = NULL; 660 KASSERT(vlist == NULL, ("vlists cannot be unmapped")); 661 } else if (vlist != NULL) { 662 ma_offs = bp->bio_ma_offset; 663 dst = NULL; 664 } else { 665 dst = bp->bio_data; 666 } 667 668 nsec = bp->bio_length / sc->sectorsize; 669 secno = bp->bio_offset / sc->sectorsize; 670 error = 0; 671 while (nsec--) { 672 osp = s_read(sc->indir, secno); 673 if (bp->bio_cmd == BIO_DELETE) { 674 if (osp != 0) 675 error = s_write(sc->indir, secno, 0); 676 } else if (bp->bio_cmd == BIO_READ) { 677 if (osp == 0) { 678 if (notmapped) { 679 error = md_malloc_move_ma(&m, &ma_offs, 680 sc->sectorsize, NULL, 0, 681 MD_MALLOC_MOVE_ZERO); 682 } else if (vlist != NULL) { 683 error = md_malloc_move_vlist(&vlist, 684 &ma_offs, sc->sectorsize, NULL, 0, 685 MD_MALLOC_MOVE_ZERO); 686 } else 687 bzero(dst, sc->sectorsize); 688 } else if (osp <= 255) { 689 if (notmapped) { 690 error = md_malloc_move_ma(&m, &ma_offs, 691 sc->sectorsize, NULL, osp, 692 MD_MALLOC_MOVE_FILL); 693 } else if (vlist != NULL) { 694 error = md_malloc_move_vlist(&vlist, 695 &ma_offs, sc->sectorsize, NULL, osp, 696 MD_MALLOC_MOVE_FILL); 697 } else 698 memset(dst, osp, sc->sectorsize); 699 } else { 700 if (notmapped) { 701 error = md_malloc_move_ma(&m, &ma_offs, 702 sc->sectorsize, (void *)osp, 0, 703 MD_MALLOC_MOVE_READ); 704 } else if (vlist != NULL) { 705 error = md_malloc_move_vlist(&vlist, 706 &ma_offs, sc->sectorsize, 707 (void *)osp, 0, 708 MD_MALLOC_MOVE_READ); 709 } else { 710 bcopy((void *)osp, dst, sc->sectorsize); 711 cpu_flush_dcache(dst, sc->sectorsize); 712 } 713 } 714 osp = 0; 715 } else if (bp->bio_cmd == BIO_WRITE) { 716 if (sc->flags & MD_COMPRESS) { 717 if (notmapped) { 718 error1 = md_malloc_move_ma(&m, &ma_offs, 719 sc->sectorsize, &uc, 0, 720 MD_MALLOC_MOVE_CMP); 721 i = error1 == 0 ? sc->sectorsize : 0; 722 } else if (vlist != NULL) { 723 error1 = md_malloc_move_vlist(&vlist, 724 &ma_offs, sc->sectorsize, &uc, 0, 725 MD_MALLOC_MOVE_CMP); 726 i = error1 == 0 ? sc->sectorsize : 0; 727 } else { 728 uc = dst[0]; 729 for (i = 1; i < sc->sectorsize; i++) { 730 if (dst[i] != uc) 731 break; 732 } 733 } 734 } else { 735 i = 0; 736 uc = 0; 737 } 738 if (i == sc->sectorsize) { 739 if (osp != uc) 740 error = s_write(sc->indir, secno, uc); 741 } else { 742 if (osp <= 255) { 743 sp = (uintptr_t)uma_zalloc(sc->uma, 744 md_malloc_wait ? M_WAITOK : 745 M_NOWAIT); 746 if (sp == 0) { 747 error = ENOSPC; 748 break; 749 } 750 if (notmapped) { 751 error = md_malloc_move_ma(&m, 752 &ma_offs, sc->sectorsize, 753 (void *)sp, 0, 754 MD_MALLOC_MOVE_WRITE); 755 } else if (vlist != NULL) { 756 error = md_malloc_move_vlist( 757 &vlist, &ma_offs, 758 sc->sectorsize, (void *)sp, 759 0, MD_MALLOC_MOVE_WRITE); 760 } else { 761 bcopy(dst, (void *)sp, 762 sc->sectorsize); 763 } 764 error = s_write(sc->indir, secno, sp); 765 } else { 766 if (notmapped) { 767 error = md_malloc_move_ma(&m, 768 &ma_offs, sc->sectorsize, 769 (void *)osp, 0, 770 MD_MALLOC_MOVE_WRITE); 771 } else if (vlist != NULL) { 772 error = md_malloc_move_vlist( 773 &vlist, &ma_offs, 774 sc->sectorsize, (void *)osp, 775 0, MD_MALLOC_MOVE_WRITE); 776 } else { 777 bcopy(dst, (void *)osp, 778 sc->sectorsize); 779 } 780 osp = 0; 781 } 782 } 783 } else { 784 error = EOPNOTSUPP; 785 } 786 if (osp > 255) 787 uma_zfree(sc->uma, (void*)osp); 788 if (error != 0) 789 break; 790 secno++; 791 if (!notmapped && vlist == NULL) 792 dst += sc->sectorsize; 793 } 794 bp->bio_resid = 0; 795 return (error); 796 } 797 798 static void 799 mdcopyto_vlist(void *src, bus_dma_segment_t *vlist, off_t offset, off_t len) 800 { 801 off_t seg_len; 802 803 while (offset >= vlist->ds_len) { 804 offset -= vlist->ds_len; 805 vlist++; 806 } 807 808 while (len != 0) { 809 seg_len = omin(len, vlist->ds_len - offset); 810 bcopy(src, (void *)(uintptr_t)(vlist->ds_addr + offset), 811 seg_len); 812 offset = 0; 813 src = (uint8_t *)src + seg_len; 814 len -= seg_len; 815 vlist++; 816 } 817 } 818 819 static void 820 mdcopyfrom_vlist(bus_dma_segment_t *vlist, off_t offset, void *dst, off_t len) 821 { 822 off_t seg_len; 823 824 while (offset >= vlist->ds_len) { 825 offset -= vlist->ds_len; 826 vlist++; 827 } 828 829 while (len != 0) { 830 seg_len = omin(len, vlist->ds_len - offset); 831 bcopy((void *)(uintptr_t)(vlist->ds_addr + offset), dst, 832 seg_len); 833 offset = 0; 834 dst = (uint8_t *)dst + seg_len; 835 len -= seg_len; 836 vlist++; 837 } 838 } 839 840 static int 841 mdstart_preload(struct md_s *sc, struct bio *bp) 842 { 843 uint8_t *p; 844 845 p = sc->pl_ptr + bp->bio_offset; 846 switch (bp->bio_cmd) { 847 case BIO_READ: 848 if ((bp->bio_flags & BIO_VLIST) != 0) { 849 mdcopyto_vlist(p, (bus_dma_segment_t *)bp->bio_data, 850 bp->bio_ma_offset, bp->bio_length); 851 } else { 852 bcopy(p, bp->bio_data, bp->bio_length); 853 } 854 cpu_flush_dcache(bp->bio_data, bp->bio_length); 855 break; 856 case BIO_WRITE: 857 if ((bp->bio_flags & BIO_VLIST) != 0) { 858 mdcopyfrom_vlist((bus_dma_segment_t *)bp->bio_data, 859 bp->bio_ma_offset, p, bp->bio_length); 860 } else { 861 bcopy(bp->bio_data, p, bp->bio_length); 862 } 863 break; 864 } 865 bp->bio_resid = 0; 866 return (0); 867 } 868 869 static int 870 mdstart_vnode(struct md_s *sc, struct bio *bp) 871 { 872 int error; 873 struct uio auio; 874 struct iovec aiov; 875 struct iovec *piov; 876 struct mount *mp; 877 struct vnode *vp; 878 struct buf *pb; 879 bus_dma_segment_t *vlist; 880 struct thread *td; 881 off_t iolen, iostart, len, zerosize; 882 int ma_offs, npages; 883 884 switch (bp->bio_cmd) { 885 case BIO_READ: 886 auio.uio_rw = UIO_READ; 887 break; 888 case BIO_WRITE: 889 case BIO_DELETE: 890 auio.uio_rw = UIO_WRITE; 891 break; 892 case BIO_FLUSH: 893 break; 894 default: 895 return (EOPNOTSUPP); 896 } 897 898 td = curthread; 899 vp = sc->vnode; 900 pb = NULL; 901 piov = NULL; 902 ma_offs = bp->bio_ma_offset; 903 len = bp->bio_length; 904 905 /* 906 * VNODE I/O 907 * 908 * If an error occurs, we set BIO_ERROR but we do not set 909 * B_INVAL because (for a write anyway), the buffer is 910 * still valid. 911 */ 912 913 if (bp->bio_cmd == BIO_FLUSH) { 914 do { 915 (void)vn_start_write(vp, &mp, V_WAIT); 916 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 917 error = VOP_FSYNC(vp, MNT_WAIT, td); 918 VOP_UNLOCK(vp); 919 vn_finished_write(mp); 920 } while (error == ERELOOKUP); 921 return (error); 922 } 923 924 auio.uio_offset = (vm_ooffset_t)bp->bio_offset; 925 auio.uio_resid = bp->bio_length; 926 auio.uio_segflg = UIO_SYSSPACE; 927 auio.uio_td = td; 928 929 if (bp->bio_cmd == BIO_DELETE) { 930 /* 931 * Emulate BIO_DELETE by writing zeros. 932 */ 933 zerosize = ZERO_REGION_SIZE - 934 (ZERO_REGION_SIZE % sc->sectorsize); 935 auio.uio_iovcnt = howmany(bp->bio_length, zerosize); 936 piov = malloc(sizeof(*piov) * auio.uio_iovcnt, M_MD, M_WAITOK); 937 auio.uio_iov = piov; 938 while (len > 0) { 939 piov->iov_base = __DECONST(void *, zero_region); 940 piov->iov_len = len; 941 if (len > zerosize) 942 piov->iov_len = zerosize; 943 len -= piov->iov_len; 944 piov++; 945 } 946 piov = auio.uio_iov; 947 } else if ((bp->bio_flags & BIO_VLIST) != 0) { 948 piov = malloc(sizeof(*piov) * bp->bio_ma_n, M_MD, M_WAITOK); 949 auio.uio_iov = piov; 950 vlist = (bus_dma_segment_t *)bp->bio_data; 951 while (len > 0) { 952 piov->iov_base = (void *)(uintptr_t)(vlist->ds_addr + 953 ma_offs); 954 piov->iov_len = vlist->ds_len - ma_offs; 955 if (piov->iov_len > len) 956 piov->iov_len = len; 957 len -= piov->iov_len; 958 ma_offs = 0; 959 vlist++; 960 piov++; 961 } 962 auio.uio_iovcnt = piov - auio.uio_iov; 963 piov = auio.uio_iov; 964 } else if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 965 pb = uma_zalloc(md_pbuf_zone, M_WAITOK); 966 MPASS((pb->b_flags & B_MAXPHYS) != 0); 967 bp->bio_resid = len; 968 unmapped_step: 969 npages = atop(min(maxphys, round_page(len + (ma_offs & 970 PAGE_MASK)))); 971 iolen = min(ptoa(npages) - (ma_offs & PAGE_MASK), len); 972 KASSERT(iolen > 0, ("zero iolen")); 973 pmap_qenter((vm_offset_t)pb->b_data, 974 &bp->bio_ma[atop(ma_offs)], npages); 975 aiov.iov_base = (void *)((vm_offset_t)pb->b_data + 976 (ma_offs & PAGE_MASK)); 977 aiov.iov_len = iolen; 978 auio.uio_iov = &aiov; 979 auio.uio_iovcnt = 1; 980 auio.uio_resid = iolen; 981 } else { 982 aiov.iov_base = bp->bio_data; 983 aiov.iov_len = bp->bio_length; 984 auio.uio_iov = &aiov; 985 auio.uio_iovcnt = 1; 986 } 987 iostart = auio.uio_offset; 988 if (auio.uio_rw == UIO_READ) { 989 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 990 error = VOP_READ(vp, &auio, 0, sc->cred); 991 VOP_UNLOCK(vp); 992 } else { 993 (void) vn_start_write(vp, &mp, V_WAIT); 994 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 995 error = VOP_WRITE(vp, &auio, sc->flags & MD_ASYNC ? 0 : IO_SYNC, 996 sc->cred); 997 VOP_UNLOCK(vp); 998 vn_finished_write(mp); 999 if (error == 0) 1000 sc->flags &= ~MD_VERIFY; 1001 } 1002 1003 /* When MD_CACHE is set, try to avoid double-caching the data. */ 1004 if (error == 0 && (sc->flags & MD_CACHE) == 0) 1005 VOP_ADVISE(vp, iostart, auio.uio_offset - 1, 1006 POSIX_FADV_DONTNEED); 1007 1008 if (pb != NULL) { 1009 pmap_qremove((vm_offset_t)pb->b_data, npages); 1010 if (error == 0) { 1011 len -= iolen; 1012 bp->bio_resid -= iolen; 1013 ma_offs += iolen; 1014 if (len > 0) 1015 goto unmapped_step; 1016 } 1017 uma_zfree(md_pbuf_zone, pb); 1018 } else { 1019 bp->bio_resid = auio.uio_resid; 1020 } 1021 1022 free(piov, M_MD); 1023 return (error); 1024 } 1025 1026 static int 1027 mdstart_swap(struct md_s *sc, struct bio *bp) 1028 { 1029 vm_page_t m; 1030 u_char *p; 1031 vm_pindex_t i, lastp; 1032 bus_dma_segment_t *vlist; 1033 int rv, ma_offs, offs, len, lastend; 1034 1035 switch (bp->bio_cmd) { 1036 case BIO_READ: 1037 case BIO_WRITE: 1038 case BIO_DELETE: 1039 break; 1040 case BIO_FLUSH: 1041 return (0); 1042 default: 1043 return (EOPNOTSUPP); 1044 } 1045 1046 p = bp->bio_data; 1047 ma_offs = (bp->bio_flags & (BIO_UNMAPPED|BIO_VLIST)) != 0 ? 1048 bp->bio_ma_offset : 0; 1049 vlist = (bp->bio_flags & BIO_VLIST) != 0 ? 1050 (bus_dma_segment_t *)bp->bio_data : NULL; 1051 1052 /* 1053 * offs is the offset at which to start operating on the 1054 * next (ie, first) page. lastp is the last page on 1055 * which we're going to operate. lastend is the ending 1056 * position within that last page (ie, PAGE_SIZE if 1057 * we're operating on complete aligned pages). 1058 */ 1059 offs = bp->bio_offset % PAGE_SIZE; 1060 lastp = (bp->bio_offset + bp->bio_length - 1) / PAGE_SIZE; 1061 lastend = (bp->bio_offset + bp->bio_length - 1) % PAGE_SIZE + 1; 1062 1063 rv = VM_PAGER_OK; 1064 vm_object_pip_add(sc->object, 1); 1065 for (i = bp->bio_offset / PAGE_SIZE; i <= lastp; i++) { 1066 len = ((i == lastp) ? lastend : PAGE_SIZE) - offs; 1067 m = vm_page_grab_unlocked(sc->object, i, VM_ALLOC_SYSTEM); 1068 if (bp->bio_cmd == BIO_READ) { 1069 if (vm_page_all_valid(m)) 1070 rv = VM_PAGER_OK; 1071 else 1072 rv = vm_pager_get_pages(sc->object, &m, 1, 1073 NULL, NULL); 1074 if (rv == VM_PAGER_ERROR) { 1075 VM_OBJECT_WLOCK(sc->object); 1076 vm_page_free(m); 1077 VM_OBJECT_WUNLOCK(sc->object); 1078 break; 1079 } else if (rv == VM_PAGER_FAIL) { 1080 /* 1081 * Pager does not have the page. Zero 1082 * the allocated page, and mark it as 1083 * valid. Do not set dirty, the page 1084 * can be recreated if thrown out. 1085 */ 1086 pmap_zero_page(m); 1087 vm_page_valid(m); 1088 } 1089 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 1090 pmap_copy_pages(&m, offs, bp->bio_ma, 1091 ma_offs, len); 1092 } else if ((bp->bio_flags & BIO_VLIST) != 0) { 1093 physcopyout_vlist(VM_PAGE_TO_PHYS(m) + offs, 1094 vlist, ma_offs, len); 1095 cpu_flush_dcache(p, len); 1096 } else { 1097 physcopyout(VM_PAGE_TO_PHYS(m) + offs, p, len); 1098 cpu_flush_dcache(p, len); 1099 } 1100 } else if (bp->bio_cmd == BIO_WRITE) { 1101 if (len == PAGE_SIZE || vm_page_all_valid(m)) 1102 rv = VM_PAGER_OK; 1103 else 1104 rv = vm_pager_get_pages(sc->object, &m, 1, 1105 NULL, NULL); 1106 if (rv == VM_PAGER_ERROR) { 1107 VM_OBJECT_WLOCK(sc->object); 1108 vm_page_free(m); 1109 VM_OBJECT_WUNLOCK(sc->object); 1110 break; 1111 } else if (rv == VM_PAGER_FAIL) 1112 pmap_zero_page(m); 1113 1114 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 1115 pmap_copy_pages(bp->bio_ma, ma_offs, &m, 1116 offs, len); 1117 } else if ((bp->bio_flags & BIO_VLIST) != 0) { 1118 physcopyin_vlist(vlist, ma_offs, 1119 VM_PAGE_TO_PHYS(m) + offs, len); 1120 } else { 1121 physcopyin(p, VM_PAGE_TO_PHYS(m) + offs, len); 1122 } 1123 1124 vm_page_valid(m); 1125 vm_page_set_dirty(m); 1126 } else if (bp->bio_cmd == BIO_DELETE) { 1127 if (len == PAGE_SIZE || vm_page_all_valid(m)) 1128 rv = VM_PAGER_OK; 1129 else 1130 rv = vm_pager_get_pages(sc->object, &m, 1, 1131 NULL, NULL); 1132 VM_OBJECT_WLOCK(sc->object); 1133 if (rv == VM_PAGER_ERROR) { 1134 vm_page_free(m); 1135 VM_OBJECT_WUNLOCK(sc->object); 1136 break; 1137 } else if (rv == VM_PAGER_FAIL) { 1138 vm_page_free(m); 1139 m = NULL; 1140 } else { 1141 /* Page is valid. */ 1142 if (len != PAGE_SIZE) { 1143 pmap_zero_page_area(m, offs, len); 1144 vm_page_set_dirty(m); 1145 } else { 1146 vm_pager_page_unswapped(m); 1147 vm_page_free(m); 1148 m = NULL; 1149 } 1150 } 1151 VM_OBJECT_WUNLOCK(sc->object); 1152 } 1153 if (m != NULL) { 1154 /* 1155 * The page may be deactivated prior to setting 1156 * PGA_REFERENCED, but in this case it will be 1157 * reactivated by the page daemon. 1158 */ 1159 if (vm_page_active(m)) 1160 vm_page_reference(m); 1161 else 1162 vm_page_activate(m); 1163 vm_page_xunbusy(m); 1164 } 1165 1166 /* Actions on further pages start at offset 0 */ 1167 p += PAGE_SIZE - offs; 1168 offs = 0; 1169 ma_offs += len; 1170 } 1171 vm_object_pip_wakeup(sc->object); 1172 return (rv != VM_PAGER_ERROR ? 0 : ENOSPC); 1173 } 1174 1175 static int 1176 mdstart_null(struct md_s *sc, struct bio *bp) 1177 { 1178 1179 switch (bp->bio_cmd) { 1180 case BIO_READ: 1181 bzero(bp->bio_data, bp->bio_length); 1182 cpu_flush_dcache(bp->bio_data, bp->bio_length); 1183 break; 1184 case BIO_WRITE: 1185 break; 1186 } 1187 bp->bio_resid = 0; 1188 return (0); 1189 } 1190 1191 static void 1192 md_handleattr(struct md_s *sc, struct bio *bp) 1193 { 1194 if (sc->fwsectors && sc->fwheads && 1195 (g_handleattr_int(bp, "GEOM::fwsectors", sc->fwsectors) != 0 || 1196 g_handleattr_int(bp, "GEOM::fwheads", sc->fwheads) != 0)) 1197 return; 1198 if (g_handleattr_int(bp, "GEOM::candelete", 1) != 0) 1199 return; 1200 if (sc->ident[0] != '\0' && 1201 g_handleattr_str(bp, "GEOM::ident", sc->ident) != 0) 1202 return; 1203 if (g_handleattr_int(bp, "MNT::verified", (sc->flags & MD_VERIFY) != 0)) 1204 return; 1205 g_io_deliver(bp, EOPNOTSUPP); 1206 } 1207 1208 static void 1209 md_kthread(void *arg) 1210 { 1211 struct md_s *sc; 1212 struct bio *bp; 1213 int error; 1214 1215 sc = arg; 1216 thread_lock(curthread); 1217 sched_prio(curthread, PRIBIO); 1218 thread_unlock(curthread); 1219 if (sc->type == MD_VNODE) 1220 curthread->td_pflags |= TDP_NORUNNINGBUF; 1221 1222 for (;;) { 1223 mtx_lock(&sc->queue_mtx); 1224 if (sc->flags & MD_SHUTDOWN) { 1225 sc->flags |= MD_EXITING; 1226 mtx_unlock(&sc->queue_mtx); 1227 kproc_exit(0); 1228 } 1229 bp = bioq_takefirst(&sc->bio_queue); 1230 if (!bp) { 1231 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 1232 continue; 1233 } 1234 mtx_unlock(&sc->queue_mtx); 1235 if (bp->bio_cmd == BIO_GETATTR) { 1236 md_handleattr(sc, bp); 1237 } else { 1238 error = sc->start(sc, bp); 1239 if (bp->bio_cmd == BIO_READ || bp->bio_cmd == BIO_WRITE) { 1240 /* 1241 * Devstat uses (bio_bcount, bio_resid) for 1242 * determining the length of the completed part 1243 * of the i/o. g_io_deliver() will translate 1244 * from bio_completed to that, but it also 1245 * destroys the bio so we must do our own 1246 * translation. 1247 */ 1248 bp->bio_bcount = bp->bio_length; 1249 devstat_end_transaction_bio(sc->devstat, bp); 1250 } 1251 bp->bio_completed = bp->bio_length - bp->bio_resid; 1252 g_io_deliver(bp, error); 1253 } 1254 } 1255 } 1256 1257 static struct md_s * 1258 mdfind(int unit) 1259 { 1260 struct md_s *sc; 1261 1262 LIST_FOREACH(sc, &md_softc_list, list) { 1263 if (sc->unit == unit) 1264 break; 1265 } 1266 return (sc); 1267 } 1268 1269 static struct md_s * 1270 mdnew(int unit, int *errp, enum md_types type) 1271 { 1272 struct md_s *sc; 1273 int error; 1274 1275 *errp = 0; 1276 if (unit == -1) 1277 unit = alloc_unr(md_uh); 1278 else 1279 unit = alloc_unr_specific(md_uh, unit); 1280 1281 if (unit == -1) { 1282 *errp = EBUSY; 1283 return (NULL); 1284 } 1285 1286 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 1287 sc->type = type; 1288 bioq_init(&sc->bio_queue); 1289 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 1290 sc->unit = unit; 1291 sprintf(sc->name, "md%d", unit); 1292 LIST_INSERT_HEAD(&md_softc_list, sc, list); 1293 error = kproc_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 1294 if (error == 0) 1295 return (sc); 1296 LIST_REMOVE(sc, list); 1297 mtx_destroy(&sc->queue_mtx); 1298 free_unr(md_uh, sc->unit); 1299 free(sc, M_MD); 1300 *errp = error; 1301 return (NULL); 1302 } 1303 1304 static void 1305 mdinit(struct md_s *sc) 1306 { 1307 struct g_geom *gp; 1308 struct g_provider *pp; 1309 1310 g_topology_lock(); 1311 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 1312 gp->softc = sc; 1313 pp = g_new_providerf(gp, "md%d", sc->unit); 1314 devstat_remove_entry(pp->stat); 1315 pp->stat = NULL; 1316 pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE; 1317 pp->mediasize = sc->mediasize; 1318 pp->sectorsize = sc->sectorsize; 1319 switch (sc->type) { 1320 case MD_MALLOC: 1321 case MD_VNODE: 1322 case MD_SWAP: 1323 pp->flags |= G_PF_ACCEPT_UNMAPPED; 1324 break; 1325 case MD_PRELOAD: 1326 case MD_NULL: 1327 break; 1328 } 1329 sc->gp = gp; 1330 sc->pp = pp; 1331 sc->devstat = devstat_new_entry("md", sc->unit, sc->sectorsize, 1332 DEVSTAT_ALL_SUPPORTED, DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 1333 sc->devstat->id = pp; 1334 g_error_provider(pp, 0); 1335 g_topology_unlock(); 1336 } 1337 1338 static int 1339 mdcreate_malloc(struct md_s *sc, struct md_req *mdr) 1340 { 1341 uintptr_t sp; 1342 int error; 1343 off_t u; 1344 1345 error = 0; 1346 if (mdr->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 1347 return (EINVAL); 1348 if (mdr->md_sectorsize != 0 && !powerof2(mdr->md_sectorsize)) 1349 return (EINVAL); 1350 /* Compression doesn't make sense if we have reserved space */ 1351 if (mdr->md_options & MD_RESERVE) 1352 mdr->md_options &= ~MD_COMPRESS; 1353 if (mdr->md_fwsectors != 0) 1354 sc->fwsectors = mdr->md_fwsectors; 1355 if (mdr->md_fwheads != 0) 1356 sc->fwheads = mdr->md_fwheads; 1357 sc->flags = mdr->md_options & (MD_COMPRESS | MD_FORCE); 1358 sc->indir = dimension(sc->mediasize / sc->sectorsize); 1359 sc->uma = uma_zcreate(sc->name, sc->sectorsize, NULL, NULL, NULL, NULL, 1360 0x1ff, 0); 1361 if (mdr->md_options & MD_RESERVE) { 1362 off_t nsectors; 1363 1364 nsectors = sc->mediasize / sc->sectorsize; 1365 for (u = 0; u < nsectors; u++) { 1366 sp = (uintptr_t)uma_zalloc(sc->uma, (md_malloc_wait ? 1367 M_WAITOK : M_NOWAIT) | M_ZERO); 1368 if (sp != 0) 1369 error = s_write(sc->indir, u, sp); 1370 else 1371 error = ENOMEM; 1372 if (error != 0) 1373 break; 1374 } 1375 } 1376 return (error); 1377 } 1378 1379 static int 1380 mdsetcred(struct md_s *sc, struct ucred *cred) 1381 { 1382 char *tmpbuf; 1383 int error = 0; 1384 1385 /* 1386 * Set credits in our softc 1387 */ 1388 1389 if (sc->cred) 1390 crfree(sc->cred); 1391 sc->cred = crhold(cred); 1392 1393 /* 1394 * Horrible kludge to establish credentials for NFS XXX. 1395 */ 1396 1397 if (sc->vnode) { 1398 struct uio auio; 1399 struct iovec aiov; 1400 1401 tmpbuf = malloc(sc->sectorsize, M_TEMP, M_WAITOK); 1402 bzero(&auio, sizeof(auio)); 1403 1404 aiov.iov_base = tmpbuf; 1405 aiov.iov_len = sc->sectorsize; 1406 auio.uio_iov = &aiov; 1407 auio.uio_iovcnt = 1; 1408 auio.uio_offset = 0; 1409 auio.uio_rw = UIO_READ; 1410 auio.uio_segflg = UIO_SYSSPACE; 1411 auio.uio_resid = aiov.iov_len; 1412 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY); 1413 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 1414 VOP_UNLOCK(sc->vnode); 1415 free(tmpbuf, M_TEMP); 1416 } 1417 return (error); 1418 } 1419 1420 static int 1421 mdcreate_vnode(struct md_s *sc, struct md_req *mdr, struct thread *td) 1422 { 1423 struct vattr vattr; 1424 struct nameidata nd; 1425 char *fname; 1426 int error, flags; 1427 1428 fname = mdr->md_file; 1429 if (mdr->md_file_seg == UIO_USERSPACE) { 1430 error = copyinstr(fname, sc->file, sizeof(sc->file), NULL); 1431 if (error != 0) 1432 return (error); 1433 } else if (mdr->md_file_seg == UIO_SYSSPACE) 1434 strlcpy(sc->file, fname, sizeof(sc->file)); 1435 else 1436 return (EDOOFUS); 1437 1438 /* 1439 * If the user specified that this is a read only device, don't 1440 * set the FWRITE mask before trying to open the backing store. 1441 */ 1442 flags = FREAD | ((mdr->md_options & MD_READONLY) ? 0 : FWRITE) \ 1443 | ((mdr->md_options & MD_VERIFY) ? O_VERIFY : 0); 1444 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, sc->file, td); 1445 error = vn_open(&nd, &flags, 0, NULL); 1446 if (error != 0) 1447 return (error); 1448 NDFREE(&nd, NDF_ONLY_PNBUF); 1449 if (nd.ni_vp->v_type != VREG) { 1450 error = EINVAL; 1451 goto bad; 1452 } 1453 error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred); 1454 if (error != 0) 1455 goto bad; 1456 if (VOP_ISLOCKED(nd.ni_vp) != LK_EXCLUSIVE) { 1457 vn_lock(nd.ni_vp, LK_UPGRADE | LK_RETRY); 1458 if (VN_IS_DOOMED(nd.ni_vp)) { 1459 /* Forced unmount. */ 1460 error = EBADF; 1461 goto bad; 1462 } 1463 } 1464 nd.ni_vp->v_vflag |= VV_MD; 1465 VOP_UNLOCK(nd.ni_vp); 1466 1467 if (mdr->md_fwsectors != 0) 1468 sc->fwsectors = mdr->md_fwsectors; 1469 if (mdr->md_fwheads != 0) 1470 sc->fwheads = mdr->md_fwheads; 1471 snprintf(sc->ident, sizeof(sc->ident), "MD-DEV%ju-INO%ju", 1472 (uintmax_t)vattr.va_fsid, (uintmax_t)vattr.va_fileid); 1473 sc->flags = mdr->md_options & (MD_ASYNC | MD_CACHE | MD_FORCE | 1474 MD_VERIFY); 1475 if (!(flags & FWRITE)) 1476 sc->flags |= MD_READONLY; 1477 sc->vnode = nd.ni_vp; 1478 1479 error = mdsetcred(sc, td->td_ucred); 1480 if (error != 0) { 1481 sc->vnode = NULL; 1482 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY); 1483 nd.ni_vp->v_vflag &= ~VV_MD; 1484 goto bad; 1485 } 1486 return (0); 1487 bad: 1488 VOP_UNLOCK(nd.ni_vp); 1489 (void)vn_close(nd.ni_vp, flags, td->td_ucred, td); 1490 return (error); 1491 } 1492 1493 static void 1494 g_md_providergone(struct g_provider *pp) 1495 { 1496 struct md_s *sc = pp->geom->softc; 1497 1498 mtx_lock(&sc->queue_mtx); 1499 sc->flags |= MD_PROVIDERGONE; 1500 wakeup(&sc->flags); 1501 mtx_unlock(&sc->queue_mtx); 1502 } 1503 1504 static int 1505 mddestroy(struct md_s *sc, struct thread *td) 1506 { 1507 1508 if (sc->gp) { 1509 g_topology_lock(); 1510 g_wither_geom(sc->gp, ENXIO); 1511 g_topology_unlock(); 1512 1513 mtx_lock(&sc->queue_mtx); 1514 while (!(sc->flags & MD_PROVIDERGONE)) 1515 msleep(&sc->flags, &sc->queue_mtx, PRIBIO, "mddestroy", 0); 1516 mtx_unlock(&sc->queue_mtx); 1517 } 1518 if (sc->devstat) { 1519 devstat_remove_entry(sc->devstat); 1520 sc->devstat = NULL; 1521 } 1522 mtx_lock(&sc->queue_mtx); 1523 sc->flags |= MD_SHUTDOWN; 1524 wakeup(sc); 1525 while (!(sc->flags & MD_EXITING)) 1526 msleep(sc->procp, &sc->queue_mtx, PRIBIO, "mddestroy", hz / 10); 1527 mtx_unlock(&sc->queue_mtx); 1528 mtx_destroy(&sc->queue_mtx); 1529 if (sc->vnode != NULL) { 1530 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY); 1531 sc->vnode->v_vflag &= ~VV_MD; 1532 VOP_UNLOCK(sc->vnode); 1533 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 1534 FREAD : (FREAD|FWRITE), sc->cred, td); 1535 } 1536 if (sc->cred != NULL) 1537 crfree(sc->cred); 1538 if (sc->object != NULL) 1539 vm_object_deallocate(sc->object); 1540 if (sc->indir) 1541 destroy_indir(sc, sc->indir); 1542 if (sc->uma) 1543 uma_zdestroy(sc->uma); 1544 1545 LIST_REMOVE(sc, list); 1546 free_unr(md_uh, sc->unit); 1547 free(sc, M_MD); 1548 return (0); 1549 } 1550 1551 static int 1552 mdresize(struct md_s *sc, struct md_req *mdr) 1553 { 1554 int error, res; 1555 vm_pindex_t oldpages, newpages; 1556 1557 switch (sc->type) { 1558 case MD_VNODE: 1559 case MD_NULL: 1560 break; 1561 case MD_SWAP: 1562 if (mdr->md_mediasize <= 0 || 1563 (mdr->md_mediasize % PAGE_SIZE) != 0) 1564 return (EDOM); 1565 oldpages = OFF_TO_IDX(sc->mediasize); 1566 newpages = OFF_TO_IDX(mdr->md_mediasize); 1567 if (newpages < oldpages) { 1568 VM_OBJECT_WLOCK(sc->object); 1569 vm_object_page_remove(sc->object, newpages, 0, 0); 1570 swap_release_by_cred(IDX_TO_OFF(oldpages - 1571 newpages), sc->cred); 1572 sc->object->charge = IDX_TO_OFF(newpages); 1573 sc->object->size = newpages; 1574 VM_OBJECT_WUNLOCK(sc->object); 1575 } else if (newpages > oldpages) { 1576 res = swap_reserve_by_cred(IDX_TO_OFF(newpages - 1577 oldpages), sc->cred); 1578 if (!res) 1579 return (ENOMEM); 1580 if ((mdr->md_options & MD_RESERVE) || 1581 (sc->flags & MD_RESERVE)) { 1582 error = swap_pager_reserve(sc->object, 1583 oldpages, newpages - oldpages); 1584 if (error < 0) { 1585 swap_release_by_cred( 1586 IDX_TO_OFF(newpages - oldpages), 1587 sc->cred); 1588 return (EDOM); 1589 } 1590 } 1591 VM_OBJECT_WLOCK(sc->object); 1592 sc->object->charge = IDX_TO_OFF(newpages); 1593 sc->object->size = newpages; 1594 VM_OBJECT_WUNLOCK(sc->object); 1595 } 1596 break; 1597 default: 1598 return (EOPNOTSUPP); 1599 } 1600 1601 sc->mediasize = mdr->md_mediasize; 1602 1603 g_topology_lock(); 1604 g_resize_provider(sc->pp, sc->mediasize); 1605 g_topology_unlock(); 1606 return (0); 1607 } 1608 1609 static int 1610 mdcreate_swap(struct md_s *sc, struct md_req *mdr, struct thread *td) 1611 { 1612 vm_ooffset_t npage; 1613 int error; 1614 1615 /* 1616 * Range check. Disallow negative sizes and sizes not being 1617 * multiple of page size. 1618 */ 1619 if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0) 1620 return (EDOM); 1621 1622 /* 1623 * Allocate an OBJT_SWAP object. 1624 * 1625 * Note the truncation. 1626 */ 1627 1628 if ((mdr->md_options & MD_VERIFY) != 0) 1629 return (EINVAL); 1630 npage = mdr->md_mediasize / PAGE_SIZE; 1631 if (mdr->md_fwsectors != 0) 1632 sc->fwsectors = mdr->md_fwsectors; 1633 if (mdr->md_fwheads != 0) 1634 sc->fwheads = mdr->md_fwheads; 1635 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * npage, 1636 VM_PROT_DEFAULT, 0, td->td_ucred); 1637 if (sc->object == NULL) 1638 return (ENOMEM); 1639 sc->flags = mdr->md_options & (MD_FORCE | MD_RESERVE); 1640 if (mdr->md_options & MD_RESERVE) { 1641 if (swap_pager_reserve(sc->object, 0, npage) < 0) { 1642 error = EDOM; 1643 goto finish; 1644 } 1645 } 1646 error = mdsetcred(sc, td->td_ucred); 1647 finish: 1648 if (error != 0) { 1649 vm_object_deallocate(sc->object); 1650 sc->object = NULL; 1651 } 1652 return (error); 1653 } 1654 1655 static int 1656 mdcreate_null(struct md_s *sc, struct md_req *mdr, struct thread *td) 1657 { 1658 1659 /* 1660 * Range check. Disallow negative sizes and sizes not being 1661 * multiple of page size. 1662 */ 1663 if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0) 1664 return (EDOM); 1665 1666 return (0); 1667 } 1668 1669 static int 1670 kern_mdattach_locked(struct thread *td, struct md_req *mdr) 1671 { 1672 struct md_s *sc; 1673 unsigned sectsize; 1674 int error, i; 1675 1676 sx_assert(&md_sx, SA_XLOCKED); 1677 1678 switch (mdr->md_type) { 1679 case MD_MALLOC: 1680 case MD_PRELOAD: 1681 case MD_VNODE: 1682 case MD_SWAP: 1683 case MD_NULL: 1684 break; 1685 default: 1686 return (EINVAL); 1687 } 1688 if (mdr->md_sectorsize == 0) 1689 sectsize = DEV_BSIZE; 1690 else 1691 sectsize = mdr->md_sectorsize; 1692 if (sectsize > maxphys || mdr->md_mediasize < sectsize) 1693 return (EINVAL); 1694 if (mdr->md_options & MD_AUTOUNIT) 1695 sc = mdnew(-1, &error, mdr->md_type); 1696 else { 1697 if (mdr->md_unit > INT_MAX) 1698 return (EINVAL); 1699 sc = mdnew(mdr->md_unit, &error, mdr->md_type); 1700 } 1701 if (sc == NULL) 1702 return (error); 1703 if (mdr->md_label != NULL) 1704 error = copyinstr(mdr->md_label, sc->label, 1705 sizeof(sc->label), NULL); 1706 if (error != 0) 1707 goto err_after_new; 1708 if (mdr->md_options & MD_AUTOUNIT) 1709 mdr->md_unit = sc->unit; 1710 sc->mediasize = mdr->md_mediasize; 1711 sc->sectorsize = sectsize; 1712 error = EDOOFUS; 1713 switch (sc->type) { 1714 case MD_MALLOC: 1715 sc->start = mdstart_malloc; 1716 error = mdcreate_malloc(sc, mdr); 1717 break; 1718 case MD_PRELOAD: 1719 /* 1720 * We disallow attaching preloaded memory disks via 1721 * ioctl. Preloaded memory disks are automatically 1722 * attached in g_md_init(). 1723 */ 1724 error = EOPNOTSUPP; 1725 break; 1726 case MD_VNODE: 1727 sc->start = mdstart_vnode; 1728 error = mdcreate_vnode(sc, mdr, td); 1729 break; 1730 case MD_SWAP: 1731 sc->start = mdstart_swap; 1732 error = mdcreate_swap(sc, mdr, td); 1733 break; 1734 case MD_NULL: 1735 sc->start = mdstart_null; 1736 error = mdcreate_null(sc, mdr, td); 1737 break; 1738 } 1739 err_after_new: 1740 if (error != 0) { 1741 mddestroy(sc, td); 1742 return (error); 1743 } 1744 1745 /* Prune off any residual fractional sector */ 1746 i = sc->mediasize % sc->sectorsize; 1747 sc->mediasize -= i; 1748 1749 mdinit(sc); 1750 return (0); 1751 } 1752 1753 static int 1754 kern_mdattach(struct thread *td, struct md_req *mdr) 1755 { 1756 int error; 1757 1758 sx_xlock(&md_sx); 1759 error = kern_mdattach_locked(td, mdr); 1760 sx_xunlock(&md_sx); 1761 return (error); 1762 } 1763 1764 static int 1765 kern_mddetach_locked(struct thread *td, struct md_req *mdr) 1766 { 1767 struct md_s *sc; 1768 1769 sx_assert(&md_sx, SA_XLOCKED); 1770 1771 if (mdr->md_mediasize != 0 || 1772 (mdr->md_options & ~MD_FORCE) != 0) 1773 return (EINVAL); 1774 1775 sc = mdfind(mdr->md_unit); 1776 if (sc == NULL) 1777 return (ENOENT); 1778 if (sc->opencount != 0 && !(sc->flags & MD_FORCE) && 1779 !(mdr->md_options & MD_FORCE)) 1780 return (EBUSY); 1781 return (mddestroy(sc, td)); 1782 } 1783 1784 static int 1785 kern_mddetach(struct thread *td, struct md_req *mdr) 1786 { 1787 int error; 1788 1789 sx_xlock(&md_sx); 1790 error = kern_mddetach_locked(td, mdr); 1791 sx_xunlock(&md_sx); 1792 return (error); 1793 } 1794 1795 static int 1796 kern_mdresize_locked(struct md_req *mdr) 1797 { 1798 struct md_s *sc; 1799 1800 sx_assert(&md_sx, SA_XLOCKED); 1801 1802 if ((mdr->md_options & ~(MD_FORCE | MD_RESERVE)) != 0) 1803 return (EINVAL); 1804 1805 sc = mdfind(mdr->md_unit); 1806 if (sc == NULL) 1807 return (ENOENT); 1808 if (mdr->md_mediasize < sc->sectorsize) 1809 return (EINVAL); 1810 mdr->md_mediasize -= mdr->md_mediasize % sc->sectorsize; 1811 if (mdr->md_mediasize < sc->mediasize && 1812 !(sc->flags & MD_FORCE) && 1813 !(mdr->md_options & MD_FORCE)) 1814 return (EBUSY); 1815 return (mdresize(sc, mdr)); 1816 } 1817 1818 static int 1819 kern_mdresize(struct md_req *mdr) 1820 { 1821 int error; 1822 1823 sx_xlock(&md_sx); 1824 error = kern_mdresize_locked(mdr); 1825 sx_xunlock(&md_sx); 1826 return (error); 1827 } 1828 1829 static int 1830 kern_mdquery_locked(struct md_req *mdr) 1831 { 1832 struct md_s *sc; 1833 int error; 1834 1835 sx_assert(&md_sx, SA_XLOCKED); 1836 1837 sc = mdfind(mdr->md_unit); 1838 if (sc == NULL) 1839 return (ENOENT); 1840 mdr->md_type = sc->type; 1841 mdr->md_options = sc->flags; 1842 mdr->md_mediasize = sc->mediasize; 1843 mdr->md_sectorsize = sc->sectorsize; 1844 error = 0; 1845 if (mdr->md_label != NULL) { 1846 error = copyout(sc->label, mdr->md_label, 1847 strlen(sc->label) + 1); 1848 if (error != 0) 1849 return (error); 1850 } 1851 if (sc->type == MD_VNODE || 1852 (sc->type == MD_PRELOAD && mdr->md_file != NULL)) 1853 error = copyout(sc->file, mdr->md_file, 1854 strlen(sc->file) + 1); 1855 return (error); 1856 } 1857 1858 static int 1859 kern_mdquery(struct md_req *mdr) 1860 { 1861 int error; 1862 1863 sx_xlock(&md_sx); 1864 error = kern_mdquery_locked(mdr); 1865 sx_xunlock(&md_sx); 1866 return (error); 1867 } 1868 1869 /* Copy members that are not userspace pointers. */ 1870 #define MD_IOCTL2REQ(mdio, mdr) do { \ 1871 (mdr)->md_unit = (mdio)->md_unit; \ 1872 (mdr)->md_type = (mdio)->md_type; \ 1873 (mdr)->md_mediasize = (mdio)->md_mediasize; \ 1874 (mdr)->md_sectorsize = (mdio)->md_sectorsize; \ 1875 (mdr)->md_options = (mdio)->md_options; \ 1876 (mdr)->md_fwheads = (mdio)->md_fwheads; \ 1877 (mdr)->md_fwsectors = (mdio)->md_fwsectors; \ 1878 (mdr)->md_units = &(mdio)->md_pad[0]; \ 1879 (mdr)->md_units_nitems = nitems((mdio)->md_pad); \ 1880 } while(0) 1881 1882 /* Copy members that might have been updated */ 1883 #define MD_REQ2IOCTL(mdr, mdio) do { \ 1884 (mdio)->md_unit = (mdr)->md_unit; \ 1885 (mdio)->md_type = (mdr)->md_type; \ 1886 (mdio)->md_mediasize = (mdr)->md_mediasize; \ 1887 (mdio)->md_sectorsize = (mdr)->md_sectorsize; \ 1888 (mdio)->md_options = (mdr)->md_options; \ 1889 (mdio)->md_fwheads = (mdr)->md_fwheads; \ 1890 (mdio)->md_fwsectors = (mdr)->md_fwsectors; \ 1891 } while(0) 1892 1893 static int 1894 mdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, 1895 struct thread *td) 1896 { 1897 struct md_req mdr; 1898 int error; 1899 1900 if (md_debug) 1901 printf("mdctlioctl(%s %lx %p %x %p)\n", 1902 devtoname(dev), cmd, addr, flags, td); 1903 1904 bzero(&mdr, sizeof(mdr)); 1905 switch (cmd) { 1906 case MDIOCATTACH: 1907 case MDIOCDETACH: 1908 case MDIOCRESIZE: 1909 case MDIOCQUERY: { 1910 struct md_ioctl *mdio = (struct md_ioctl *)addr; 1911 if (mdio->md_version != MDIOVERSION) 1912 return (EINVAL); 1913 MD_IOCTL2REQ(mdio, &mdr); 1914 mdr.md_file = mdio->md_file; 1915 mdr.md_file_seg = UIO_USERSPACE; 1916 /* If the file is adjacent to the md_ioctl it's in kernel. */ 1917 if ((void *)mdio->md_file == (void *)(mdio + 1)) 1918 mdr.md_file_seg = UIO_SYSSPACE; 1919 mdr.md_label = mdio->md_label; 1920 break; 1921 } 1922 #ifdef COMPAT_FREEBSD32 1923 case MDIOCATTACH_32: 1924 case MDIOCDETACH_32: 1925 case MDIOCRESIZE_32: 1926 case MDIOCQUERY_32: { 1927 struct md_ioctl32 *mdio = (struct md_ioctl32 *)addr; 1928 if (mdio->md_version != MDIOVERSION) 1929 return (EINVAL); 1930 MD_IOCTL2REQ(mdio, &mdr); 1931 mdr.md_file = (void *)(uintptr_t)mdio->md_file; 1932 mdr.md_file_seg = UIO_USERSPACE; 1933 mdr.md_label = (void *)(uintptr_t)mdio->md_label; 1934 break; 1935 } 1936 #endif 1937 default: 1938 /* Fall through to handler switch. */ 1939 break; 1940 } 1941 1942 error = 0; 1943 switch (cmd) { 1944 case MDIOCATTACH: 1945 #ifdef COMPAT_FREEBSD32 1946 case MDIOCATTACH_32: 1947 #endif 1948 error = kern_mdattach(td, &mdr); 1949 break; 1950 case MDIOCDETACH: 1951 #ifdef COMPAT_FREEBSD32 1952 case MDIOCDETACH_32: 1953 #endif 1954 error = kern_mddetach(td, &mdr); 1955 break; 1956 case MDIOCRESIZE: 1957 #ifdef COMPAT_FREEBSD32 1958 case MDIOCRESIZE_32: 1959 #endif 1960 error = kern_mdresize(&mdr); 1961 break; 1962 case MDIOCQUERY: 1963 #ifdef COMPAT_FREEBSD32 1964 case MDIOCQUERY_32: 1965 #endif 1966 error = kern_mdquery(&mdr); 1967 break; 1968 default: 1969 error = ENOIOCTL; 1970 } 1971 1972 switch (cmd) { 1973 case MDIOCATTACH: 1974 case MDIOCQUERY: { 1975 struct md_ioctl *mdio = (struct md_ioctl *)addr; 1976 MD_REQ2IOCTL(&mdr, mdio); 1977 break; 1978 } 1979 #ifdef COMPAT_FREEBSD32 1980 case MDIOCATTACH_32: 1981 case MDIOCQUERY_32: { 1982 struct md_ioctl32 *mdio = (struct md_ioctl32 *)addr; 1983 MD_REQ2IOCTL(&mdr, mdio); 1984 break; 1985 } 1986 #endif 1987 default: 1988 /* Other commands to not alter mdr. */ 1989 break; 1990 } 1991 1992 return (error); 1993 } 1994 1995 static void 1996 md_preloaded(u_char *image, size_t length, const char *name) 1997 { 1998 struct md_s *sc; 1999 int error; 2000 2001 sc = mdnew(-1, &error, MD_PRELOAD); 2002 if (sc == NULL) 2003 return; 2004 sc->mediasize = length; 2005 sc->sectorsize = DEV_BSIZE; 2006 sc->pl_ptr = image; 2007 sc->pl_len = length; 2008 sc->start = mdstart_preload; 2009 if (name != NULL) 2010 strlcpy(sc->file, name, sizeof(sc->file)); 2011 #ifdef MD_ROOT 2012 if (sc->unit == 0) { 2013 #ifndef ROOTDEVNAME 2014 rootdevnames[0] = MD_ROOT_FSTYPE ":/dev/md0"; 2015 #endif 2016 #ifdef MD_ROOT_READONLY 2017 sc->flags |= MD_READONLY; 2018 #endif 2019 } 2020 #endif 2021 mdinit(sc); 2022 if (name != NULL) { 2023 printf("%s%d: Preloaded image <%s> %zd bytes at %p\n", 2024 MD_NAME, sc->unit, name, length, image); 2025 } else { 2026 printf("%s%d: Embedded image %zd bytes at %p\n", 2027 MD_NAME, sc->unit, length, image); 2028 } 2029 } 2030 2031 static void 2032 g_md_init(struct g_class *mp __unused) 2033 { 2034 caddr_t mod; 2035 u_char *ptr, *name, *type; 2036 unsigned len; 2037 int i; 2038 2039 /* figure out log2(NINDIR) */ 2040 for (i = NINDIR, nshift = -1; i; nshift++) 2041 i >>= 1; 2042 2043 mod = NULL; 2044 sx_init(&md_sx, "MD config lock"); 2045 g_topology_unlock(); 2046 md_uh = new_unrhdr(0, INT_MAX, NULL); 2047 #ifdef MD_ROOT 2048 if (mfs_root_size != 0) { 2049 sx_xlock(&md_sx); 2050 #ifdef MD_ROOT_MEM 2051 md_preloaded(mfs_root, mfs_root_size, NULL); 2052 #else 2053 md_preloaded(__DEVOLATILE(u_char *, &mfs_root), mfs_root_size, 2054 NULL); 2055 #endif 2056 sx_xunlock(&md_sx); 2057 } 2058 #endif 2059 /* XXX: are preload_* static or do they need Giant ? */ 2060 while ((mod = preload_search_next_name(mod)) != NULL) { 2061 name = (char *)preload_search_info(mod, MODINFO_NAME); 2062 if (name == NULL) 2063 continue; 2064 type = (char *)preload_search_info(mod, MODINFO_TYPE); 2065 if (type == NULL) 2066 continue; 2067 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 2068 continue; 2069 ptr = preload_fetch_addr(mod); 2070 len = preload_fetch_size(mod); 2071 if (ptr != NULL && len != 0) { 2072 sx_xlock(&md_sx); 2073 md_preloaded(ptr, len, name); 2074 sx_xunlock(&md_sx); 2075 } 2076 } 2077 md_pbuf_zone = pbuf_zsecond_create("mdpbuf", nswbuf / 10); 2078 status_dev = make_dev(&mdctl_cdevsw, INT_MAX, UID_ROOT, GID_WHEEL, 2079 0600, MDCTL_NAME); 2080 g_topology_lock(); 2081 } 2082 2083 static void 2084 g_md_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 2085 struct g_consumer *cp __unused, struct g_provider *pp) 2086 { 2087 struct md_s *mp; 2088 char *type; 2089 2090 mp = gp->softc; 2091 if (mp == NULL) 2092 return; 2093 2094 switch (mp->type) { 2095 case MD_MALLOC: 2096 type = "malloc"; 2097 break; 2098 case MD_PRELOAD: 2099 type = "preload"; 2100 break; 2101 case MD_VNODE: 2102 type = "vnode"; 2103 break; 2104 case MD_SWAP: 2105 type = "swap"; 2106 break; 2107 case MD_NULL: 2108 type = "null"; 2109 break; 2110 default: 2111 type = "unknown"; 2112 break; 2113 } 2114 2115 if (pp != NULL) { 2116 if (indent == NULL) { 2117 sbuf_printf(sb, " u %d", mp->unit); 2118 sbuf_printf(sb, " s %ju", (uintmax_t) mp->sectorsize); 2119 sbuf_printf(sb, " f %ju", (uintmax_t) mp->fwheads); 2120 sbuf_printf(sb, " fs %ju", (uintmax_t) mp->fwsectors); 2121 sbuf_printf(sb, " l %ju", (uintmax_t) mp->mediasize); 2122 sbuf_printf(sb, " t %s", type); 2123 if ((mp->type == MD_VNODE && mp->vnode != NULL) || 2124 (mp->type == MD_PRELOAD && mp->file[0] != '\0')) 2125 sbuf_printf(sb, " file %s", mp->file); 2126 sbuf_printf(sb, " label %s", mp->label); 2127 } else { 2128 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent, 2129 mp->unit); 2130 sbuf_printf(sb, "%s<sectorsize>%ju</sectorsize>\n", 2131 indent, (uintmax_t) mp->sectorsize); 2132 sbuf_printf(sb, "%s<fwheads>%ju</fwheads>\n", 2133 indent, (uintmax_t) mp->fwheads); 2134 sbuf_printf(sb, "%s<fwsectors>%ju</fwsectors>\n", 2135 indent, (uintmax_t) mp->fwsectors); 2136 if (mp->ident[0] != '\0') { 2137 sbuf_printf(sb, "%s<ident>", indent); 2138 g_conf_printf_escaped(sb, "%s", mp->ident); 2139 sbuf_printf(sb, "</ident>\n"); 2140 } 2141 sbuf_printf(sb, "%s<length>%ju</length>\n", 2142 indent, (uintmax_t) mp->mediasize); 2143 sbuf_printf(sb, "%s<compression>%s</compression>\n", indent, 2144 (mp->flags & MD_COMPRESS) == 0 ? "off": "on"); 2145 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 2146 (mp->flags & MD_READONLY) == 0 ? "read-write": 2147 "read-only"); 2148 sbuf_printf(sb, "%s<type>%s</type>\n", indent, 2149 type); 2150 if ((mp->type == MD_VNODE && mp->vnode != NULL) || 2151 (mp->type == MD_PRELOAD && mp->file[0] != '\0')) { 2152 sbuf_printf(sb, "%s<file>", indent); 2153 g_conf_printf_escaped(sb, "%s", mp->file); 2154 sbuf_printf(sb, "</file>\n"); 2155 } 2156 if (mp->type == MD_VNODE) 2157 sbuf_printf(sb, "%s<cache>%s</cache>\n", indent, 2158 (mp->flags & MD_CACHE) == 0 ? "off": "on"); 2159 sbuf_printf(sb, "%s<label>", indent); 2160 g_conf_printf_escaped(sb, "%s", mp->label); 2161 sbuf_printf(sb, "</label>\n"); 2162 } 2163 } 2164 } 2165 2166 static void 2167 g_md_fini(struct g_class *mp __unused) 2168 { 2169 2170 sx_destroy(&md_sx); 2171 if (status_dev != NULL) 2172 destroy_dev(status_dev); 2173 uma_zdestroy(md_pbuf_zone); 2174 delete_unrhdr(md_uh); 2175 }
Cache object: ec322eec9b34d9edefc11412c469aebe
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