Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/dev/md/md.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /*- 2 * ---------------------------------------------------------------------------- 3 * "THE BEER-WARE LICENSE" (Revision 42): 4 * <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you 5 * can do whatever you want with this stuff. If we meet some day, and you think 6 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 7 * ---------------------------------------------------------------------------- 8 * 9 * $FreeBSD: releng/9.0/sys/dev/md/md.c 223920 2011-07-11 05:19:28Z ae $ 10 * 11 */ 12 13 /*- 14 * The following functions are based in the vn(4) driver: mdstart_swap(), 15 * mdstart_vnode(), mdcreate_swap(), mdcreate_vnode() and mddestroy(), 16 * and as such under the following copyright: 17 * 18 * Copyright (c) 1988 University of Utah. 19 * Copyright (c) 1990, 1993 20 * The Regents of the University of California. All rights reserved. 21 * 22 * This code is derived from software contributed to Berkeley by 23 * the Systems Programming Group of the University of Utah Computer 24 * Science Department. 25 * 26 * Redistribution and use in source and binary forms, with or without 27 * modification, are permitted provided that the following conditions 28 * are met: 29 * 1. Redistributions of source code must retain the above copyright 30 * notice, this list of conditions and the following disclaimer. 31 * 2. Redistributions in binary form must reproduce the above copyright 32 * notice, this list of conditions and the following disclaimer in the 33 * documentation and/or other materials provided with the distribution. 34 * 4. Neither the name of the University nor the names of its contributors 35 * may be used to endorse or promote products derived from this software 36 * without specific prior written permission. 37 * 38 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 39 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 41 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 42 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 43 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 44 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 45 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 46 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 47 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 48 * SUCH DAMAGE. 49 * 50 * from: Utah Hdr: vn.c 1.13 94/04/02 51 * 52 * from: @(#)vn.c 8.6 (Berkeley) 4/1/94 53 * From: src/sys/dev/vn/vn.c,v 1.122 2000/12/16 16:06:03 54 */ 55 56 #include "opt_geom.h" 57 #include "opt_md.h" 58 59 #include <sys/param.h> 60 #include <sys/systm.h> 61 #include <sys/bio.h> 62 #include <sys/conf.h> 63 #include <sys/devicestat.h> 64 #include <sys/fcntl.h> 65 #include <sys/kernel.h> 66 #include <sys/kthread.h> 67 #include <sys/limits.h> 68 #include <sys/linker.h> 69 #include <sys/lock.h> 70 #include <sys/malloc.h> 71 #include <sys/mdioctl.h> 72 #include <sys/mount.h> 73 #include <sys/mutex.h> 74 #include <sys/sx.h> 75 #include <sys/namei.h> 76 #include <sys/proc.h> 77 #include <sys/queue.h> 78 #include <sys/sbuf.h> 79 #include <sys/sched.h> 80 #include <sys/sf_buf.h> 81 #include <sys/sysctl.h> 82 #include <sys/vnode.h> 83 84 #include <geom/geom.h> 85 86 #include <vm/vm.h> 87 #include <vm/vm_object.h> 88 #include <vm/vm_page.h> 89 #include <vm/vm_pager.h> 90 #include <vm/swap_pager.h> 91 #include <vm/uma.h> 92 93 #include <machine/vmparam.h> 94 95 #define MD_MODVER 1 96 97 #define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */ 98 #define MD_EXITING 0x20000 /* Worker thread is exiting. */ 99 100 #ifndef MD_NSECT 101 #define MD_NSECT (10000 * 2) 102 #endif 103 104 static MALLOC_DEFINE(M_MD, "md_disk", "Memory Disk"); 105 static MALLOC_DEFINE(M_MDSECT, "md_sectors", "Memory Disk Sectors"); 106 107 static int md_debug; 108 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, ""); 109 static int md_malloc_wait; 110 SYSCTL_INT(_vm, OID_AUTO, md_malloc_wait, CTLFLAG_RW, &md_malloc_wait, 0, ""); 111 112 #if defined(MD_ROOT) && defined(MD_ROOT_SIZE) 113 /* 114 * Preloaded image gets put here. 115 * Applications that patch the object with the image can determine 116 * the size looking at the start and end markers (strings), 117 * so we want them contiguous. 118 */ 119 static struct { 120 u_char start[MD_ROOT_SIZE*1024]; 121 u_char end[128]; 122 } mfs_root = { 123 .start = "MFS Filesystem goes here", 124 .end = "MFS Filesystem had better STOP here", 125 }; 126 #endif 127 128 static g_init_t g_md_init; 129 static g_fini_t g_md_fini; 130 static g_start_t g_md_start; 131 static g_access_t g_md_access; 132 static void g_md_dumpconf(struct sbuf *sb, const char *indent, 133 struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp); 134 135 static int mdunits; 136 static struct cdev *status_dev = 0; 137 static struct sx md_sx; 138 static struct unrhdr *md_uh; 139 140 static d_ioctl_t mdctlioctl; 141 142 static struct cdevsw mdctl_cdevsw = { 143 .d_version = D_VERSION, 144 .d_ioctl = mdctlioctl, 145 .d_name = MD_NAME, 146 }; 147 148 struct g_class g_md_class = { 149 .name = "MD", 150 .version = G_VERSION, 151 .init = g_md_init, 152 .fini = g_md_fini, 153 .start = g_md_start, 154 .access = g_md_access, 155 .dumpconf = g_md_dumpconf, 156 }; 157 158 DECLARE_GEOM_CLASS(g_md_class, g_md); 159 160 161 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(md_softc_list); 162 163 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 164 #define NMASK (NINDIR-1) 165 static int nshift; 166 167 struct indir { 168 uintptr_t *array; 169 u_int total; 170 u_int used; 171 u_int shift; 172 }; 173 174 struct md_s { 175 int unit; 176 LIST_ENTRY(md_s) list; 177 struct bio_queue_head bio_queue; 178 struct mtx queue_mtx; 179 struct cdev *dev; 180 enum md_types type; 181 off_t mediasize; 182 unsigned sectorsize; 183 unsigned opencount; 184 unsigned fwheads; 185 unsigned fwsectors; 186 unsigned flags; 187 char name[20]; 188 struct proc *procp; 189 struct g_geom *gp; 190 struct g_provider *pp; 191 int (*start)(struct md_s *sc, struct bio *bp); 192 struct devstat *devstat; 193 194 /* MD_MALLOC related fields */ 195 struct indir *indir; 196 uma_zone_t uma; 197 198 /* MD_PRELOAD related fields */ 199 u_char *pl_ptr; 200 size_t pl_len; 201 202 /* MD_VNODE related fields */ 203 struct vnode *vnode; 204 char file[PATH_MAX]; 205 struct ucred *cred; 206 207 /* MD_SWAP related fields */ 208 vm_object_t object; 209 }; 210 211 static struct indir * 212 new_indir(u_int shift) 213 { 214 struct indir *ip; 215 216 ip = malloc(sizeof *ip, M_MD, (md_malloc_wait ? M_WAITOK : M_NOWAIT) 217 | M_ZERO); 218 if (ip == NULL) 219 return (NULL); 220 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 221 M_MDSECT, (md_malloc_wait ? M_WAITOK : M_NOWAIT) | M_ZERO); 222 if (ip->array == NULL) { 223 free(ip, M_MD); 224 return (NULL); 225 } 226 ip->total = NINDIR; 227 ip->shift = shift; 228 return (ip); 229 } 230 231 static void 232 del_indir(struct indir *ip) 233 { 234 235 free(ip->array, M_MDSECT); 236 free(ip, M_MD); 237 } 238 239 static void 240 destroy_indir(struct md_s *sc, struct indir *ip) 241 { 242 int i; 243 244 for (i = 0; i < NINDIR; i++) { 245 if (!ip->array[i]) 246 continue; 247 if (ip->shift) 248 destroy_indir(sc, (struct indir*)(ip->array[i])); 249 else if (ip->array[i] > 255) 250 uma_zfree(sc->uma, (void *)(ip->array[i])); 251 } 252 del_indir(ip); 253 } 254 255 /* 256 * This function does the math and allocates the top level "indir" structure 257 * for a device of "size" sectors. 258 */ 259 260 static struct indir * 261 dimension(off_t size) 262 { 263 off_t rcnt; 264 struct indir *ip; 265 int layer; 266 267 rcnt = size; 268 layer = 0; 269 while (rcnt > NINDIR) { 270 rcnt /= NINDIR; 271 layer++; 272 } 273 274 /* 275 * XXX: the top layer is probably not fully populated, so we allocate 276 * too much space for ip->array in here. 277 */ 278 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO); 279 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 280 M_MDSECT, M_WAITOK | M_ZERO); 281 ip->total = NINDIR; 282 ip->shift = layer * nshift; 283 return (ip); 284 } 285 286 /* 287 * Read a given sector 288 */ 289 290 static uintptr_t 291 s_read(struct indir *ip, off_t offset) 292 { 293 struct indir *cip; 294 int idx; 295 uintptr_t up; 296 297 if (md_debug > 1) 298 printf("s_read(%jd)\n", (intmax_t)offset); 299 up = 0; 300 for (cip = ip; cip != NULL;) { 301 if (cip->shift) { 302 idx = (offset >> cip->shift) & NMASK; 303 up = cip->array[idx]; 304 cip = (struct indir *)up; 305 continue; 306 } 307 idx = offset & NMASK; 308 return (cip->array[idx]); 309 } 310 return (0); 311 } 312 313 /* 314 * Write a given sector, prune the tree if the value is 0 315 */ 316 317 static int 318 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 319 { 320 struct indir *cip, *lip[10]; 321 int idx, li; 322 uintptr_t up; 323 324 if (md_debug > 1) 325 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 326 up = 0; 327 li = 0; 328 cip = ip; 329 for (;;) { 330 lip[li++] = cip; 331 if (cip->shift) { 332 idx = (offset >> cip->shift) & NMASK; 333 up = cip->array[idx]; 334 if (up != 0) { 335 cip = (struct indir *)up; 336 continue; 337 } 338 /* Allocate branch */ 339 cip->array[idx] = 340 (uintptr_t)new_indir(cip->shift - nshift); 341 if (cip->array[idx] == 0) 342 return (ENOSPC); 343 cip->used++; 344 up = cip->array[idx]; 345 cip = (struct indir *)up; 346 continue; 347 } 348 /* leafnode */ 349 idx = offset & NMASK; 350 up = cip->array[idx]; 351 if (up != 0) 352 cip->used--; 353 cip->array[idx] = ptr; 354 if (ptr != 0) 355 cip->used++; 356 break; 357 } 358 if (cip->used != 0 || li == 1) 359 return (0); 360 li--; 361 while (cip->used == 0 && cip != ip) { 362 li--; 363 idx = (offset >> lip[li]->shift) & NMASK; 364 up = lip[li]->array[idx]; 365 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 366 del_indir(cip); 367 lip[li]->array[idx] = 0; 368 lip[li]->used--; 369 cip = lip[li]; 370 } 371 return (0); 372 } 373 374 375 static int 376 g_md_access(struct g_provider *pp, int r, int w, int e) 377 { 378 struct md_s *sc; 379 380 sc = pp->geom->softc; 381 if (sc == NULL) { 382 if (r <= 0 && w <= 0 && e <= 0) 383 return (0); 384 return (ENXIO); 385 } 386 r += pp->acr; 387 w += pp->acw; 388 e += pp->ace; 389 if ((sc->flags & MD_READONLY) != 0 && w > 0) 390 return (EROFS); 391 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 392 sc->opencount = 1; 393 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 394 sc->opencount = 0; 395 } 396 return (0); 397 } 398 399 static void 400 g_md_start(struct bio *bp) 401 { 402 struct md_s *sc; 403 404 sc = bp->bio_to->geom->softc; 405 if ((bp->bio_cmd == BIO_READ) || (bp->bio_cmd == BIO_WRITE)) 406 devstat_start_transaction_bio(sc->devstat, bp); 407 mtx_lock(&sc->queue_mtx); 408 bioq_disksort(&sc->bio_queue, bp); 409 mtx_unlock(&sc->queue_mtx); 410 wakeup(sc); 411 } 412 413 static int 414 mdstart_malloc(struct md_s *sc, struct bio *bp) 415 { 416 int i, error; 417 u_char *dst; 418 off_t secno, nsec, uc; 419 uintptr_t sp, osp; 420 421 switch (bp->bio_cmd) { 422 case BIO_READ: 423 case BIO_WRITE: 424 case BIO_DELETE: 425 break; 426 default: 427 return (EOPNOTSUPP); 428 } 429 430 nsec = bp->bio_length / sc->sectorsize; 431 secno = bp->bio_offset / sc->sectorsize; 432 dst = bp->bio_data; 433 error = 0; 434 while (nsec--) { 435 osp = s_read(sc->indir, secno); 436 if (bp->bio_cmd == BIO_DELETE) { 437 if (osp != 0) 438 error = s_write(sc->indir, secno, 0); 439 } else if (bp->bio_cmd == BIO_READ) { 440 if (osp == 0) 441 bzero(dst, sc->sectorsize); 442 else if (osp <= 255) 443 memset(dst, osp, sc->sectorsize); 444 else { 445 bcopy((void *)osp, dst, sc->sectorsize); 446 cpu_flush_dcache(dst, sc->sectorsize); 447 } 448 osp = 0; 449 } else if (bp->bio_cmd == BIO_WRITE) { 450 if (sc->flags & MD_COMPRESS) { 451 uc = dst[0]; 452 for (i = 1; i < sc->sectorsize; i++) 453 if (dst[i] != uc) 454 break; 455 } else { 456 i = 0; 457 uc = 0; 458 } 459 if (i == sc->sectorsize) { 460 if (osp != uc) 461 error = s_write(sc->indir, secno, uc); 462 } else { 463 if (osp <= 255) { 464 sp = (uintptr_t)uma_zalloc(sc->uma, 465 md_malloc_wait ? M_WAITOK : 466 M_NOWAIT); 467 if (sp == 0) { 468 error = ENOSPC; 469 break; 470 } 471 bcopy(dst, (void *)sp, sc->sectorsize); 472 error = s_write(sc->indir, secno, sp); 473 } else { 474 bcopy(dst, (void *)osp, sc->sectorsize); 475 osp = 0; 476 } 477 } 478 } else { 479 error = EOPNOTSUPP; 480 } 481 if (osp > 255) 482 uma_zfree(sc->uma, (void*)osp); 483 if (error != 0) 484 break; 485 secno++; 486 dst += sc->sectorsize; 487 } 488 bp->bio_resid = 0; 489 return (error); 490 } 491 492 static int 493 mdstart_preload(struct md_s *sc, struct bio *bp) 494 { 495 496 switch (bp->bio_cmd) { 497 case BIO_READ: 498 bcopy(sc->pl_ptr + bp->bio_offset, bp->bio_data, 499 bp->bio_length); 500 cpu_flush_dcache(bp->bio_data, bp->bio_length); 501 break; 502 case BIO_WRITE: 503 bcopy(bp->bio_data, sc->pl_ptr + bp->bio_offset, 504 bp->bio_length); 505 break; 506 } 507 bp->bio_resid = 0; 508 return (0); 509 } 510 511 static int 512 mdstart_vnode(struct md_s *sc, struct bio *bp) 513 { 514 int error, vfslocked; 515 struct uio auio; 516 struct iovec aiov; 517 struct mount *mp; 518 struct vnode *vp; 519 struct thread *td; 520 off_t end, zerosize; 521 522 switch (bp->bio_cmd) { 523 case BIO_READ: 524 case BIO_WRITE: 525 case BIO_DELETE: 526 case BIO_FLUSH: 527 break; 528 default: 529 return (EOPNOTSUPP); 530 } 531 532 td = curthread; 533 vp = sc->vnode; 534 535 /* 536 * VNODE I/O 537 * 538 * If an error occurs, we set BIO_ERROR but we do not set 539 * B_INVAL because (for a write anyway), the buffer is 540 * still valid. 541 */ 542 543 if (bp->bio_cmd == BIO_FLUSH) { 544 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 545 (void) vn_start_write(vp, &mp, V_WAIT); 546 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 547 error = VOP_FSYNC(vp, MNT_WAIT, td); 548 VOP_UNLOCK(vp, 0); 549 vn_finished_write(mp); 550 VFS_UNLOCK_GIANT(vfslocked); 551 return (error); 552 } 553 554 bzero(&auio, sizeof(auio)); 555 556 /* 557 * Special case for BIO_DELETE. On the surface, this is very 558 * similar to BIO_WRITE, except that we write from our own 559 * fixed-length buffer, so we have to loop. The net result is 560 * that the two cases end up having very little in common. 561 */ 562 if (bp->bio_cmd == BIO_DELETE) { 563 zerosize = ZERO_REGION_SIZE - 564 (ZERO_REGION_SIZE % sc->sectorsize); 565 auio.uio_iov = &aiov; 566 auio.uio_iovcnt = 1; 567 auio.uio_offset = (vm_ooffset_t)bp->bio_offset; 568 auio.uio_segflg = UIO_SYSSPACE; 569 auio.uio_rw = UIO_WRITE; 570 auio.uio_td = td; 571 end = bp->bio_offset + bp->bio_length; 572 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 573 (void) vn_start_write(vp, &mp, V_WAIT); 574 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 575 error = 0; 576 while (auio.uio_offset < end) { 577 aiov.iov_base = __DECONST(void *, zero_region); 578 aiov.iov_len = end - auio.uio_offset; 579 if (aiov.iov_len > zerosize) 580 aiov.iov_len = zerosize; 581 auio.uio_resid = aiov.iov_len; 582 error = VOP_WRITE(vp, &auio, 583 sc->flags & MD_ASYNC ? 0 : IO_SYNC, sc->cred); 584 if (error != 0) 585 break; 586 } 587 VOP_UNLOCK(vp, 0); 588 vn_finished_write(mp); 589 bp->bio_resid = end - auio.uio_offset; 590 VFS_UNLOCK_GIANT(vfslocked); 591 return (error); 592 } 593 594 aiov.iov_base = bp->bio_data; 595 aiov.iov_len = bp->bio_length; 596 auio.uio_iov = &aiov; 597 auio.uio_iovcnt = 1; 598 auio.uio_offset = (vm_ooffset_t)bp->bio_offset; 599 auio.uio_segflg = UIO_SYSSPACE; 600 if (bp->bio_cmd == BIO_READ) 601 auio.uio_rw = UIO_READ; 602 else if (bp->bio_cmd == BIO_WRITE) 603 auio.uio_rw = UIO_WRITE; 604 else 605 panic("wrong BIO_OP in mdstart_vnode"); 606 auio.uio_resid = bp->bio_length; 607 auio.uio_td = td; 608 /* 609 * When reading set IO_DIRECT to try to avoid double-caching 610 * the data. When writing IO_DIRECT is not optimal. 611 */ 612 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 613 if (bp->bio_cmd == BIO_READ) { 614 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 615 error = VOP_READ(vp, &auio, IO_DIRECT, sc->cred); 616 VOP_UNLOCK(vp, 0); 617 } else { 618 (void) vn_start_write(vp, &mp, V_WAIT); 619 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 620 error = VOP_WRITE(vp, &auio, sc->flags & MD_ASYNC ? 0 : IO_SYNC, 621 sc->cred); 622 VOP_UNLOCK(vp, 0); 623 vn_finished_write(mp); 624 } 625 VFS_UNLOCK_GIANT(vfslocked); 626 bp->bio_resid = auio.uio_resid; 627 return (error); 628 } 629 630 static int 631 mdstart_swap(struct md_s *sc, struct bio *bp) 632 { 633 struct sf_buf *sf; 634 int rv, offs, len, lastend; 635 vm_pindex_t i, lastp; 636 vm_page_t m; 637 u_char *p; 638 639 switch (bp->bio_cmd) { 640 case BIO_READ: 641 case BIO_WRITE: 642 case BIO_DELETE: 643 break; 644 default: 645 return (EOPNOTSUPP); 646 } 647 648 p = bp->bio_data; 649 650 /* 651 * offs is the offset at which to start operating on the 652 * next (ie, first) page. lastp is the last page on 653 * which we're going to operate. lastend is the ending 654 * position within that last page (ie, PAGE_SIZE if 655 * we're operating on complete aligned pages). 656 */ 657 offs = bp->bio_offset % PAGE_SIZE; 658 lastp = (bp->bio_offset + bp->bio_length - 1) / PAGE_SIZE; 659 lastend = (bp->bio_offset + bp->bio_length - 1) % PAGE_SIZE + 1; 660 661 rv = VM_PAGER_OK; 662 VM_OBJECT_LOCK(sc->object); 663 vm_object_pip_add(sc->object, 1); 664 for (i = bp->bio_offset / PAGE_SIZE; i <= lastp; i++) { 665 len = ((i == lastp) ? lastend : PAGE_SIZE) - offs; 666 667 m = vm_page_grab(sc->object, i, 668 VM_ALLOC_NORMAL|VM_ALLOC_RETRY); 669 VM_OBJECT_UNLOCK(sc->object); 670 sched_pin(); 671 sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 672 VM_OBJECT_LOCK(sc->object); 673 if (bp->bio_cmd == BIO_READ) { 674 if (m->valid != VM_PAGE_BITS_ALL) 675 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 676 if (rv == VM_PAGER_ERROR) { 677 sf_buf_free(sf); 678 sched_unpin(); 679 vm_page_wakeup(m); 680 break; 681 } 682 bcopy((void *)(sf_buf_kva(sf) + offs), p, len); 683 cpu_flush_dcache(p, len); 684 } else if (bp->bio_cmd == BIO_WRITE) { 685 if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL) 686 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 687 if (rv == VM_PAGER_ERROR) { 688 sf_buf_free(sf); 689 sched_unpin(); 690 vm_page_wakeup(m); 691 break; 692 } 693 bcopy(p, (void *)(sf_buf_kva(sf) + offs), len); 694 m->valid = VM_PAGE_BITS_ALL; 695 } else if (bp->bio_cmd == BIO_DELETE) { 696 if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL) 697 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 698 if (rv == VM_PAGER_ERROR) { 699 sf_buf_free(sf); 700 sched_unpin(); 701 vm_page_wakeup(m); 702 break; 703 } 704 if (len != PAGE_SIZE) { 705 bzero((void *)(sf_buf_kva(sf) + offs), len); 706 vm_page_clear_dirty(m, offs, len); 707 m->valid = VM_PAGE_BITS_ALL; 708 } else 709 vm_pager_page_unswapped(m); 710 } 711 sf_buf_free(sf); 712 sched_unpin(); 713 vm_page_wakeup(m); 714 vm_page_lock(m); 715 if (bp->bio_cmd == BIO_DELETE && len == PAGE_SIZE) 716 vm_page_free(m); 717 else 718 vm_page_activate(m); 719 vm_page_unlock(m); 720 if (bp->bio_cmd == BIO_WRITE) 721 vm_page_dirty(m); 722 723 /* Actions on further pages start at offset 0 */ 724 p += PAGE_SIZE - offs; 725 offs = 0; 726 #if 0 727 if (bootverbose || bp->bio_offset / PAGE_SIZE < 17) 728 printf("wire_count %d busy %d flags %x hold_count %d act_count %d queue %d valid %d dirty %d @ %d\n", 729 m->wire_count, m->busy, 730 m->flags, m->hold_count, m->act_count, m->queue, m->valid, m->dirty, i); 731 #endif 732 } 733 vm_object_pip_subtract(sc->object, 1); 734 VM_OBJECT_UNLOCK(sc->object); 735 return (rv != VM_PAGER_ERROR ? 0 : ENOSPC); 736 } 737 738 static void 739 md_kthread(void *arg) 740 { 741 struct md_s *sc; 742 struct bio *bp; 743 int error; 744 745 sc = arg; 746 thread_lock(curthread); 747 sched_prio(curthread, PRIBIO); 748 thread_unlock(curthread); 749 if (sc->type == MD_VNODE) 750 curthread->td_pflags |= TDP_NORUNNINGBUF; 751 752 for (;;) { 753 mtx_lock(&sc->queue_mtx); 754 if (sc->flags & MD_SHUTDOWN) { 755 sc->flags |= MD_EXITING; 756 mtx_unlock(&sc->queue_mtx); 757 kproc_exit(0); 758 } 759 bp = bioq_takefirst(&sc->bio_queue); 760 if (!bp) { 761 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 762 continue; 763 } 764 mtx_unlock(&sc->queue_mtx); 765 if (bp->bio_cmd == BIO_GETATTR) { 766 if ((sc->fwsectors && sc->fwheads && 767 (g_handleattr_int(bp, "GEOM::fwsectors", 768 sc->fwsectors) || 769 g_handleattr_int(bp, "GEOM::fwheads", 770 sc->fwheads))) || 771 g_handleattr_int(bp, "GEOM::candelete", 1)) 772 error = -1; 773 else 774 error = EOPNOTSUPP; 775 } else { 776 error = sc->start(sc, bp); 777 } 778 779 if (error != -1) { 780 bp->bio_completed = bp->bio_length; 781 if ((bp->bio_cmd == BIO_READ) || (bp->bio_cmd == BIO_WRITE)) 782 devstat_end_transaction_bio(sc->devstat, bp); 783 g_io_deliver(bp, error); 784 } 785 } 786 } 787 788 static struct md_s * 789 mdfind(int unit) 790 { 791 struct md_s *sc; 792 793 LIST_FOREACH(sc, &md_softc_list, list) { 794 if (sc->unit == unit) 795 break; 796 } 797 return (sc); 798 } 799 800 static struct md_s * 801 mdnew(int unit, int *errp, enum md_types type) 802 { 803 struct md_s *sc; 804 int error; 805 806 *errp = 0; 807 if (unit == -1) 808 unit = alloc_unr(md_uh); 809 else 810 unit = alloc_unr_specific(md_uh, unit); 811 812 if (unit == -1) { 813 *errp = EBUSY; 814 return (NULL); 815 } 816 817 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 818 sc->type = type; 819 bioq_init(&sc->bio_queue); 820 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 821 sc->unit = unit; 822 sprintf(sc->name, "md%d", unit); 823 LIST_INSERT_HEAD(&md_softc_list, sc, list); 824 error = kproc_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 825 if (error == 0) 826 return (sc); 827 LIST_REMOVE(sc, list); 828 mtx_destroy(&sc->queue_mtx); 829 free_unr(md_uh, sc->unit); 830 free(sc, M_MD); 831 *errp = error; 832 return (NULL); 833 } 834 835 static void 836 mdinit(struct md_s *sc) 837 { 838 struct g_geom *gp; 839 struct g_provider *pp; 840 841 g_topology_lock(); 842 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 843 gp->softc = sc; 844 pp = g_new_providerf(gp, "md%d", sc->unit); 845 pp->mediasize = sc->mediasize; 846 pp->sectorsize = sc->sectorsize; 847 sc->gp = gp; 848 sc->pp = pp; 849 g_error_provider(pp, 0); 850 g_topology_unlock(); 851 sc->devstat = devstat_new_entry("md", sc->unit, sc->sectorsize, 852 DEVSTAT_ALL_SUPPORTED, DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 853 } 854 855 /* 856 * XXX: we should check that the range they feed us is mapped. 857 * XXX: we should implement read-only. 858 */ 859 860 static int 861 mdcreate_preload(struct md_s *sc, struct md_ioctl *mdio) 862 { 863 864 if (mdio->md_options & ~(MD_AUTOUNIT | MD_FORCE)) 865 return (EINVAL); 866 if (mdio->md_base == 0) 867 return (EINVAL); 868 sc->flags = mdio->md_options & MD_FORCE; 869 /* Cast to pointer size, then to pointer to avoid warning */ 870 sc->pl_ptr = (u_char *)(uintptr_t)mdio->md_base; 871 sc->pl_len = (size_t)sc->mediasize; 872 return (0); 873 } 874 875 876 static int 877 mdcreate_malloc(struct md_s *sc, struct md_ioctl *mdio) 878 { 879 uintptr_t sp; 880 int error; 881 off_t u; 882 883 error = 0; 884 if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 885 return (EINVAL); 886 if (mdio->md_sectorsize != 0 && !powerof2(mdio->md_sectorsize)) 887 return (EINVAL); 888 /* Compression doesn't make sense if we have reserved space */ 889 if (mdio->md_options & MD_RESERVE) 890 mdio->md_options &= ~MD_COMPRESS; 891 if (mdio->md_fwsectors != 0) 892 sc->fwsectors = mdio->md_fwsectors; 893 if (mdio->md_fwheads != 0) 894 sc->fwheads = mdio->md_fwheads; 895 sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE); 896 sc->indir = dimension(sc->mediasize / sc->sectorsize); 897 sc->uma = uma_zcreate(sc->name, sc->sectorsize, NULL, NULL, NULL, NULL, 898 0x1ff, 0); 899 if (mdio->md_options & MD_RESERVE) { 900 off_t nsectors; 901 902 nsectors = sc->mediasize / sc->sectorsize; 903 for (u = 0; u < nsectors; u++) { 904 sp = (uintptr_t)uma_zalloc(sc->uma, (md_malloc_wait ? 905 M_WAITOK : M_NOWAIT) | M_ZERO); 906 if (sp != 0) 907 error = s_write(sc->indir, u, sp); 908 else 909 error = ENOMEM; 910 if (error != 0) 911 break; 912 } 913 } 914 return (error); 915 } 916 917 918 static int 919 mdsetcred(struct md_s *sc, struct ucred *cred) 920 { 921 char *tmpbuf; 922 int error = 0; 923 924 /* 925 * Set credits in our softc 926 */ 927 928 if (sc->cred) 929 crfree(sc->cred); 930 sc->cred = crhold(cred); 931 932 /* 933 * Horrible kludge to establish credentials for NFS XXX. 934 */ 935 936 if (sc->vnode) { 937 struct uio auio; 938 struct iovec aiov; 939 940 tmpbuf = malloc(sc->sectorsize, M_TEMP, M_WAITOK); 941 bzero(&auio, sizeof(auio)); 942 943 aiov.iov_base = tmpbuf; 944 aiov.iov_len = sc->sectorsize; 945 auio.uio_iov = &aiov; 946 auio.uio_iovcnt = 1; 947 auio.uio_offset = 0; 948 auio.uio_rw = UIO_READ; 949 auio.uio_segflg = UIO_SYSSPACE; 950 auio.uio_resid = aiov.iov_len; 951 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY); 952 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 953 VOP_UNLOCK(sc->vnode, 0); 954 free(tmpbuf, M_TEMP); 955 } 956 return (error); 957 } 958 959 static int 960 mdcreate_vnode(struct md_s *sc, struct md_ioctl *mdio, struct thread *td) 961 { 962 struct vattr vattr; 963 struct nameidata nd; 964 char *fname; 965 int error, flags, vfslocked; 966 967 /* 968 * Kernel-originated requests must have the filename appended 969 * to the mdio structure to protect against malicious software. 970 */ 971 fname = mdio->md_file; 972 if ((void *)fname != (void *)(mdio + 1)) { 973 error = copyinstr(fname, sc->file, sizeof(sc->file), NULL); 974 if (error != 0) 975 return (error); 976 } else 977 strlcpy(sc->file, fname, sizeof(sc->file)); 978 979 /* 980 * If the user specified that this is a read only device, don't 981 * set the FWRITE mask before trying to open the backing store. 982 */ 983 flags = FREAD | ((mdio->md_options & MD_READONLY) ? 0 : FWRITE); 984 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE, UIO_SYSSPACE, sc->file, td); 985 error = vn_open(&nd, &flags, 0, NULL); 986 if (error != 0) 987 return (error); 988 vfslocked = NDHASGIANT(&nd); 989 NDFREE(&nd, NDF_ONLY_PNBUF); 990 if (nd.ni_vp->v_type != VREG) { 991 error = EINVAL; 992 goto bad; 993 } 994 error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred); 995 if (error != 0) 996 goto bad; 997 if (VOP_ISLOCKED(nd.ni_vp) != LK_EXCLUSIVE) { 998 vn_lock(nd.ni_vp, LK_UPGRADE | LK_RETRY); 999 if (nd.ni_vp->v_iflag & VI_DOOMED) { 1000 /* Forced unmount. */ 1001 error = EBADF; 1002 goto bad; 1003 } 1004 } 1005 nd.ni_vp->v_vflag |= VV_MD; 1006 VOP_UNLOCK(nd.ni_vp, 0); 1007 1008 if (mdio->md_fwsectors != 0) 1009 sc->fwsectors = mdio->md_fwsectors; 1010 if (mdio->md_fwheads != 0) 1011 sc->fwheads = mdio->md_fwheads; 1012 sc->flags = mdio->md_options & (MD_FORCE | MD_ASYNC); 1013 if (!(flags & FWRITE)) 1014 sc->flags |= MD_READONLY; 1015 sc->vnode = nd.ni_vp; 1016 1017 error = mdsetcred(sc, td->td_ucred); 1018 if (error != 0) { 1019 sc->vnode = NULL; 1020 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY); 1021 nd.ni_vp->v_vflag &= ~VV_MD; 1022 goto bad; 1023 } 1024 VFS_UNLOCK_GIANT(vfslocked); 1025 return (0); 1026 bad: 1027 VOP_UNLOCK(nd.ni_vp, 0); 1028 (void)vn_close(nd.ni_vp, flags, td->td_ucred, td); 1029 VFS_UNLOCK_GIANT(vfslocked); 1030 return (error); 1031 } 1032 1033 static int 1034 mddestroy(struct md_s *sc, struct thread *td) 1035 { 1036 int vfslocked; 1037 1038 if (sc->gp) { 1039 sc->gp->softc = NULL; 1040 g_topology_lock(); 1041 g_wither_geom(sc->gp, ENXIO); 1042 g_topology_unlock(); 1043 sc->gp = NULL; 1044 sc->pp = NULL; 1045 } 1046 if (sc->devstat) { 1047 devstat_remove_entry(sc->devstat); 1048 sc->devstat = NULL; 1049 } 1050 mtx_lock(&sc->queue_mtx); 1051 sc->flags |= MD_SHUTDOWN; 1052 wakeup(sc); 1053 while (!(sc->flags & MD_EXITING)) 1054 msleep(sc->procp, &sc->queue_mtx, PRIBIO, "mddestroy", hz / 10); 1055 mtx_unlock(&sc->queue_mtx); 1056 mtx_destroy(&sc->queue_mtx); 1057 if (sc->vnode != NULL) { 1058 vfslocked = VFS_LOCK_GIANT(sc->vnode->v_mount); 1059 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY); 1060 sc->vnode->v_vflag &= ~VV_MD; 1061 VOP_UNLOCK(sc->vnode, 0); 1062 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 1063 FREAD : (FREAD|FWRITE), sc->cred, td); 1064 VFS_UNLOCK_GIANT(vfslocked); 1065 } 1066 if (sc->cred != NULL) 1067 crfree(sc->cred); 1068 if (sc->object != NULL) 1069 vm_object_deallocate(sc->object); 1070 if (sc->indir) 1071 destroy_indir(sc, sc->indir); 1072 if (sc->uma) 1073 uma_zdestroy(sc->uma); 1074 1075 LIST_REMOVE(sc, list); 1076 free_unr(md_uh, sc->unit); 1077 free(sc, M_MD); 1078 return (0); 1079 } 1080 1081 static int 1082 mdcreate_swap(struct md_s *sc, struct md_ioctl *mdio, struct thread *td) 1083 { 1084 vm_ooffset_t npage; 1085 int error; 1086 1087 /* 1088 * Range check. Disallow negative sizes or any size less then the 1089 * size of a page. Then round to a page. 1090 */ 1091 if (sc->mediasize == 0 || (sc->mediasize % PAGE_SIZE) != 0) 1092 return (EDOM); 1093 1094 /* 1095 * Allocate an OBJT_SWAP object. 1096 * 1097 * Note the truncation. 1098 */ 1099 1100 npage = mdio->md_mediasize / PAGE_SIZE; 1101 if (mdio->md_fwsectors != 0) 1102 sc->fwsectors = mdio->md_fwsectors; 1103 if (mdio->md_fwheads != 0) 1104 sc->fwheads = mdio->md_fwheads; 1105 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * npage, 1106 VM_PROT_DEFAULT, 0, td->td_ucred); 1107 if (sc->object == NULL) 1108 return (ENOMEM); 1109 sc->flags = mdio->md_options & MD_FORCE; 1110 if (mdio->md_options & MD_RESERVE) { 1111 if (swap_pager_reserve(sc->object, 0, npage) < 0) { 1112 error = EDOM; 1113 goto finish; 1114 } 1115 } 1116 error = mdsetcred(sc, td->td_ucred); 1117 finish: 1118 if (error != 0) { 1119 vm_object_deallocate(sc->object); 1120 sc->object = NULL; 1121 } 1122 return (error); 1123 } 1124 1125 1126 static int 1127 xmdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 1128 { 1129 struct md_ioctl *mdio; 1130 struct md_s *sc; 1131 int error, i; 1132 1133 if (md_debug) 1134 printf("mdctlioctl(%s %lx %p %x %p)\n", 1135 devtoname(dev), cmd, addr, flags, td); 1136 1137 mdio = (struct md_ioctl *)addr; 1138 if (mdio->md_version != MDIOVERSION) 1139 return (EINVAL); 1140 1141 /* 1142 * We assert the version number in the individual ioctl 1143 * handlers instead of out here because (a) it is possible we 1144 * may add another ioctl in the future which doesn't read an 1145 * mdio, and (b) the correct return value for an unknown ioctl 1146 * is ENOIOCTL, not EINVAL. 1147 */ 1148 error = 0; 1149 switch (cmd) { 1150 case MDIOCATTACH: 1151 switch (mdio->md_type) { 1152 case MD_MALLOC: 1153 case MD_PRELOAD: 1154 case MD_VNODE: 1155 case MD_SWAP: 1156 break; 1157 default: 1158 return (EINVAL); 1159 } 1160 if (mdio->md_options & MD_AUTOUNIT) 1161 sc = mdnew(-1, &error, mdio->md_type); 1162 else { 1163 if (mdio->md_unit > INT_MAX) 1164 return (EINVAL); 1165 sc = mdnew(mdio->md_unit, &error, mdio->md_type); 1166 } 1167 if (sc == NULL) 1168 return (error); 1169 if (mdio->md_options & MD_AUTOUNIT) 1170 mdio->md_unit = sc->unit; 1171 sc->mediasize = mdio->md_mediasize; 1172 if (mdio->md_sectorsize == 0) 1173 sc->sectorsize = DEV_BSIZE; 1174 else 1175 sc->sectorsize = mdio->md_sectorsize; 1176 error = EDOOFUS; 1177 switch (sc->type) { 1178 case MD_MALLOC: 1179 sc->start = mdstart_malloc; 1180 error = mdcreate_malloc(sc, mdio); 1181 break; 1182 case MD_PRELOAD: 1183 sc->start = mdstart_preload; 1184 error = mdcreate_preload(sc, mdio); 1185 break; 1186 case MD_VNODE: 1187 sc->start = mdstart_vnode; 1188 error = mdcreate_vnode(sc, mdio, td); 1189 break; 1190 case MD_SWAP: 1191 sc->start = mdstart_swap; 1192 error = mdcreate_swap(sc, mdio, td); 1193 break; 1194 } 1195 if (error != 0) { 1196 mddestroy(sc, td); 1197 return (error); 1198 } 1199 1200 /* Prune off any residual fractional sector */ 1201 i = sc->mediasize % sc->sectorsize; 1202 sc->mediasize -= i; 1203 1204 mdinit(sc); 1205 return (0); 1206 case MDIOCDETACH: 1207 if (mdio->md_mediasize != 0 || 1208 (mdio->md_options & ~MD_FORCE) != 0) 1209 return (EINVAL); 1210 1211 sc = mdfind(mdio->md_unit); 1212 if (sc == NULL) 1213 return (ENOENT); 1214 if (sc->opencount != 0 && !(sc->flags & MD_FORCE) && 1215 !(mdio->md_options & MD_FORCE)) 1216 return (EBUSY); 1217 return (mddestroy(sc, td)); 1218 case MDIOCQUERY: 1219 sc = mdfind(mdio->md_unit); 1220 if (sc == NULL) 1221 return (ENOENT); 1222 mdio->md_type = sc->type; 1223 mdio->md_options = sc->flags; 1224 mdio->md_mediasize = sc->mediasize; 1225 mdio->md_sectorsize = sc->sectorsize; 1226 if (sc->type == MD_VNODE) 1227 error = copyout(sc->file, mdio->md_file, 1228 strlen(sc->file) + 1); 1229 return (error); 1230 case MDIOCLIST: 1231 i = 1; 1232 LIST_FOREACH(sc, &md_softc_list, list) { 1233 if (i == MDNPAD - 1) 1234 mdio->md_pad[i] = -1; 1235 else 1236 mdio->md_pad[i++] = sc->unit; 1237 } 1238 mdio->md_pad[0] = i - 1; 1239 return (0); 1240 default: 1241 return (ENOIOCTL); 1242 }; 1243 } 1244 1245 static int 1246 mdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 1247 { 1248 int error; 1249 1250 sx_xlock(&md_sx); 1251 error = xmdctlioctl(dev, cmd, addr, flags, td); 1252 sx_xunlock(&md_sx); 1253 return (error); 1254 } 1255 1256 static void 1257 md_preloaded(u_char *image, size_t length) 1258 { 1259 struct md_s *sc; 1260 int error; 1261 1262 sc = mdnew(-1, &error, MD_PRELOAD); 1263 if (sc == NULL) 1264 return; 1265 sc->mediasize = length; 1266 sc->sectorsize = DEV_BSIZE; 1267 sc->pl_ptr = image; 1268 sc->pl_len = length; 1269 sc->start = mdstart_preload; 1270 #ifdef MD_ROOT 1271 if (sc->unit == 0) 1272 rootdevnames[0] = "ufs:/dev/md0"; 1273 #endif 1274 mdinit(sc); 1275 } 1276 1277 static void 1278 g_md_init(struct g_class *mp __unused) 1279 { 1280 caddr_t mod; 1281 u_char *ptr, *name, *type; 1282 unsigned len; 1283 int i; 1284 1285 /* figure out log2(NINDIR) */ 1286 for (i = NINDIR, nshift = -1; i; nshift++) 1287 i >>= 1; 1288 1289 mod = NULL; 1290 sx_init(&md_sx, "MD config lock"); 1291 g_topology_unlock(); 1292 md_uh = new_unrhdr(0, INT_MAX, NULL); 1293 #ifdef MD_ROOT_SIZE 1294 sx_xlock(&md_sx); 1295 md_preloaded(mfs_root.start, sizeof(mfs_root.start)); 1296 sx_xunlock(&md_sx); 1297 #endif 1298 /* XXX: are preload_* static or do they need Giant ? */ 1299 while ((mod = preload_search_next_name(mod)) != NULL) { 1300 name = (char *)preload_search_info(mod, MODINFO_NAME); 1301 if (name == NULL) 1302 continue; 1303 type = (char *)preload_search_info(mod, MODINFO_TYPE); 1304 if (type == NULL) 1305 continue; 1306 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 1307 continue; 1308 ptr = preload_fetch_addr(mod); 1309 len = preload_fetch_size(mod); 1310 if (ptr != NULL && len != 0) { 1311 printf("%s%d: Preloaded image <%s> %d bytes at %p\n", 1312 MD_NAME, mdunits, name, len, ptr); 1313 sx_xlock(&md_sx); 1314 md_preloaded(ptr, len); 1315 sx_xunlock(&md_sx); 1316 } 1317 } 1318 status_dev = make_dev(&mdctl_cdevsw, INT_MAX, UID_ROOT, GID_WHEEL, 1319 0600, MDCTL_NAME); 1320 g_topology_lock(); 1321 } 1322 1323 static void 1324 g_md_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 1325 struct g_consumer *cp __unused, struct g_provider *pp) 1326 { 1327 struct md_s *mp; 1328 char *type; 1329 1330 mp = gp->softc; 1331 if (mp == NULL) 1332 return; 1333 1334 switch (mp->type) { 1335 case MD_MALLOC: 1336 type = "malloc"; 1337 break; 1338 case MD_PRELOAD: 1339 type = "preload"; 1340 break; 1341 case MD_VNODE: 1342 type = "vnode"; 1343 break; 1344 case MD_SWAP: 1345 type = "swap"; 1346 break; 1347 default: 1348 type = "unknown"; 1349 break; 1350 } 1351 1352 if (pp != NULL) { 1353 if (indent == NULL) { 1354 sbuf_printf(sb, " u %d", mp->unit); 1355 sbuf_printf(sb, " s %ju", (uintmax_t) mp->sectorsize); 1356 sbuf_printf(sb, " f %ju", (uintmax_t) mp->fwheads); 1357 sbuf_printf(sb, " fs %ju", (uintmax_t) mp->fwsectors); 1358 sbuf_printf(sb, " l %ju", (uintmax_t) mp->mediasize); 1359 sbuf_printf(sb, " t %s", type); 1360 if (mp->type == MD_VNODE && mp->vnode != NULL) 1361 sbuf_printf(sb, " file %s", mp->file); 1362 } else { 1363 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent, 1364 mp->unit); 1365 sbuf_printf(sb, "%s<sectorsize>%ju</sectorsize>\n", 1366 indent, (uintmax_t) mp->sectorsize); 1367 sbuf_printf(sb, "%s<fwheads>%ju</fwheads>\n", 1368 indent, (uintmax_t) mp->fwheads); 1369 sbuf_printf(sb, "%s<fwsectors>%ju</fwsectors>\n", 1370 indent, (uintmax_t) mp->fwsectors); 1371 sbuf_printf(sb, "%s<length>%ju</length>\n", 1372 indent, (uintmax_t) mp->mediasize); 1373 sbuf_printf(sb, "%s<type>%s</type>\n", indent, 1374 type); 1375 if (mp->type == MD_VNODE && mp->vnode != NULL) 1376 sbuf_printf(sb, "%s<file>%s</file>\n", 1377 indent, mp->file); 1378 } 1379 } 1380 } 1381 1382 static void 1383 g_md_fini(struct g_class *mp __unused) 1384 { 1385 1386 sx_destroy(&md_sx); 1387 if (status_dev != NULL) 1388 destroy_dev(status_dev); 1389 delete_unrhdr(md_uh); 1390 }
Cache object: c7550d6da7497ca87cfde6b1eb0044d2
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]