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 * $FreeBSD$ 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 * Copyright (c) 2013 The FreeBSD Foundation 22 * All rights reserved. 23 * 24 * This code is derived from software contributed to Berkeley by 25 * the Systems Programming Group of the University of Utah Computer 26 * Science Department. 27 * 28 * Portions of this software were developed by Konstantin Belousov 29 * under sponsorship from the FreeBSD Foundation. 30 * 31 * Redistribution and use in source and binary forms, with or without 32 * modification, are permitted provided that the following conditions 33 * are met: 34 * 1. Redistributions of source code must retain the above copyright 35 * notice, this list of conditions and the following disclaimer. 36 * 2. Redistributions in binary form must reproduce the above copyright 37 * notice, this list of conditions and the following disclaimer in the 38 * documentation and/or other materials provided with the distribution. 39 * 4. Neither the name of the University nor the names of its contributors 40 * may be used to endorse or promote products derived from this software 41 * without specific prior written permission. 42 * 43 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 44 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 46 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 49 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 51 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 52 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 53 * SUCH DAMAGE. 54 * 55 * from: Utah Hdr: vn.c 1.13 94/04/02 56 * 57 * from: @(#)vn.c 8.6 (Berkeley) 4/1/94 58 * From: src/sys/dev/vn/vn.c,v 1.122 2000/12/16 16:06:03 59 */ 60 61 #include "opt_geom.h" 62 #include "opt_md.h" 63 64 #include <sys/param.h> 65 #include <sys/systm.h> 66 #include <sys/bio.h> 67 #include <sys/buf.h> 68 #include <sys/conf.h> 69 #include <sys/devicestat.h> 70 #include <sys/fcntl.h> 71 #include <sys/kernel.h> 72 #include <sys/kthread.h> 73 #include <sys/limits.h> 74 #include <sys/linker.h> 75 #include <sys/lock.h> 76 #include <sys/malloc.h> 77 #include <sys/mdioctl.h> 78 #include <sys/mount.h> 79 #include <sys/mutex.h> 80 #include <sys/sx.h> 81 #include <sys/namei.h> 82 #include <sys/proc.h> 83 #include <sys/queue.h> 84 #include <sys/rwlock.h> 85 #include <sys/sbuf.h> 86 #include <sys/sched.h> 87 #include <sys/sf_buf.h> 88 #include <sys/sysctl.h> 89 #include <sys/vnode.h> 90 91 #include <geom/geom.h> 92 93 #include <vm/vm.h> 94 #include <vm/vm_param.h> 95 #include <vm/vm_object.h> 96 #include <vm/vm_page.h> 97 #include <vm/vm_pager.h> 98 #include <vm/swap_pager.h> 99 #include <vm/uma.h> 100 101 #define MD_MODVER 1 102 103 #define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */ 104 #define MD_EXITING 0x20000 /* Worker thread is exiting. */ 105 106 #ifndef MD_NSECT 107 #define MD_NSECT (10000 * 2) 108 #endif 109 110 static MALLOC_DEFINE(M_MD, "md_disk", "Memory Disk"); 111 static MALLOC_DEFINE(M_MDSECT, "md_sectors", "Memory Disk Sectors"); 112 113 static int md_debug; 114 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, 115 "Enable md(4) debug messages"); 116 static int md_malloc_wait; 117 SYSCTL_INT(_vm, OID_AUTO, md_malloc_wait, CTLFLAG_RW, &md_malloc_wait, 0, 118 "Allow malloc to wait for memory allocations"); 119 120 #if defined(MD_ROOT) && !defined(MD_ROOT_FSTYPE) 121 #define MD_ROOT_FSTYPE "ufs" 122 #endif 123 124 #if defined(MD_ROOT) && defined(MD_ROOT_SIZE) 125 /* 126 * Preloaded image gets put here. 127 * Applications that patch the object with the image can determine 128 * the size looking at the start and end markers (strings), 129 * so we want them contiguous. 130 */ 131 static struct { 132 u_char start[MD_ROOT_SIZE*1024]; 133 u_char end[128]; 134 } mfs_root = { 135 .start = "MFS Filesystem goes here", 136 .end = "MFS Filesystem had better STOP here", 137 }; 138 #endif 139 140 static g_init_t g_md_init; 141 static g_fini_t g_md_fini; 142 static g_start_t g_md_start; 143 static g_access_t g_md_access; 144 static void g_md_dumpconf(struct sbuf *sb, const char *indent, 145 struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp); 146 147 static struct cdev *status_dev = 0; 148 static struct sx md_sx; 149 static struct unrhdr *md_uh; 150 151 static d_ioctl_t mdctlioctl; 152 153 static struct cdevsw mdctl_cdevsw = { 154 .d_version = D_VERSION, 155 .d_ioctl = mdctlioctl, 156 .d_name = MD_NAME, 157 }; 158 159 struct g_class g_md_class = { 160 .name = "MD", 161 .version = G_VERSION, 162 .init = g_md_init, 163 .fini = g_md_fini, 164 .start = g_md_start, 165 .access = g_md_access, 166 .dumpconf = g_md_dumpconf, 167 }; 168 169 DECLARE_GEOM_CLASS(g_md_class, g_md); 170 171 172 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(md_softc_list); 173 174 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 175 #define NMASK (NINDIR-1) 176 static int nshift; 177 178 static int md_vnode_pbuf_freecnt; 179 180 struct indir { 181 uintptr_t *array; 182 u_int total; 183 u_int used; 184 u_int shift; 185 }; 186 187 struct md_s { 188 int unit; 189 LIST_ENTRY(md_s) list; 190 struct bio_queue_head bio_queue; 191 struct mtx queue_mtx; 192 struct mtx stat_mtx; 193 struct cdev *dev; 194 enum md_types type; 195 off_t mediasize; 196 unsigned sectorsize; 197 unsigned opencount; 198 unsigned fwheads; 199 unsigned fwsectors; 200 unsigned flags; 201 char name[20]; 202 struct proc *procp; 203 struct g_geom *gp; 204 struct g_provider *pp; 205 int (*start)(struct md_s *sc, struct bio *bp); 206 struct devstat *devstat; 207 208 /* MD_MALLOC related fields */ 209 struct indir *indir; 210 uma_zone_t uma; 211 212 /* MD_PRELOAD related fields */ 213 u_char *pl_ptr; 214 size_t pl_len; 215 216 /* MD_VNODE related fields */ 217 struct vnode *vnode; 218 char file[PATH_MAX]; 219 struct ucred *cred; 220 221 /* MD_SWAP related fields */ 222 vm_object_t object; 223 }; 224 225 static struct indir * 226 new_indir(u_int shift) 227 { 228 struct indir *ip; 229 230 ip = malloc(sizeof *ip, M_MD, (md_malloc_wait ? M_WAITOK : M_NOWAIT) 231 | M_ZERO); 232 if (ip == NULL) 233 return (NULL); 234 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 235 M_MDSECT, (md_malloc_wait ? M_WAITOK : M_NOWAIT) | M_ZERO); 236 if (ip->array == NULL) { 237 free(ip, M_MD); 238 return (NULL); 239 } 240 ip->total = NINDIR; 241 ip->shift = shift; 242 return (ip); 243 } 244 245 static void 246 del_indir(struct indir *ip) 247 { 248 249 free(ip->array, M_MDSECT); 250 free(ip, M_MD); 251 } 252 253 static void 254 destroy_indir(struct md_s *sc, struct indir *ip) 255 { 256 int i; 257 258 for (i = 0; i < NINDIR; i++) { 259 if (!ip->array[i]) 260 continue; 261 if (ip->shift) 262 destroy_indir(sc, (struct indir*)(ip->array[i])); 263 else if (ip->array[i] > 255) 264 uma_zfree(sc->uma, (void *)(ip->array[i])); 265 } 266 del_indir(ip); 267 } 268 269 /* 270 * This function does the math and allocates the top level "indir" structure 271 * for a device of "size" sectors. 272 */ 273 274 static struct indir * 275 dimension(off_t size) 276 { 277 off_t rcnt; 278 struct indir *ip; 279 int layer; 280 281 rcnt = size; 282 layer = 0; 283 while (rcnt > NINDIR) { 284 rcnt /= NINDIR; 285 layer++; 286 } 287 288 /* 289 * XXX: the top layer is probably not fully populated, so we allocate 290 * too much space for ip->array in here. 291 */ 292 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO); 293 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 294 M_MDSECT, M_WAITOK | M_ZERO); 295 ip->total = NINDIR; 296 ip->shift = layer * nshift; 297 return (ip); 298 } 299 300 /* 301 * Read a given sector 302 */ 303 304 static uintptr_t 305 s_read(struct indir *ip, off_t offset) 306 { 307 struct indir *cip; 308 int idx; 309 uintptr_t up; 310 311 if (md_debug > 1) 312 printf("s_read(%jd)\n", (intmax_t)offset); 313 up = 0; 314 for (cip = ip; cip != NULL;) { 315 if (cip->shift) { 316 idx = (offset >> cip->shift) & NMASK; 317 up = cip->array[idx]; 318 cip = (struct indir *)up; 319 continue; 320 } 321 idx = offset & NMASK; 322 return (cip->array[idx]); 323 } 324 return (0); 325 } 326 327 /* 328 * Write a given sector, prune the tree if the value is 0 329 */ 330 331 static int 332 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 333 { 334 struct indir *cip, *lip[10]; 335 int idx, li; 336 uintptr_t up; 337 338 if (md_debug > 1) 339 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 340 up = 0; 341 li = 0; 342 cip = ip; 343 for (;;) { 344 lip[li++] = cip; 345 if (cip->shift) { 346 idx = (offset >> cip->shift) & NMASK; 347 up = cip->array[idx]; 348 if (up != 0) { 349 cip = (struct indir *)up; 350 continue; 351 } 352 /* Allocate branch */ 353 cip->array[idx] = 354 (uintptr_t)new_indir(cip->shift - nshift); 355 if (cip->array[idx] == 0) 356 return (ENOSPC); 357 cip->used++; 358 up = cip->array[idx]; 359 cip = (struct indir *)up; 360 continue; 361 } 362 /* leafnode */ 363 idx = offset & NMASK; 364 up = cip->array[idx]; 365 if (up != 0) 366 cip->used--; 367 cip->array[idx] = ptr; 368 if (ptr != 0) 369 cip->used++; 370 break; 371 } 372 if (cip->used != 0 || li == 1) 373 return (0); 374 li--; 375 while (cip->used == 0 && cip != ip) { 376 li--; 377 idx = (offset >> lip[li]->shift) & NMASK; 378 up = lip[li]->array[idx]; 379 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 380 del_indir(cip); 381 lip[li]->array[idx] = 0; 382 lip[li]->used--; 383 cip = lip[li]; 384 } 385 return (0); 386 } 387 388 389 static int 390 g_md_access(struct g_provider *pp, int r, int w, int e) 391 { 392 struct md_s *sc; 393 394 sc = pp->geom->softc; 395 if (sc == NULL) { 396 if (r <= 0 && w <= 0 && e <= 0) 397 return (0); 398 return (ENXIO); 399 } 400 r += pp->acr; 401 w += pp->acw; 402 e += pp->ace; 403 if ((sc->flags & MD_READONLY) != 0 && w > 0) 404 return (EROFS); 405 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 406 sc->opencount = 1; 407 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 408 sc->opencount = 0; 409 } 410 return (0); 411 } 412 413 static void 414 g_md_start(struct bio *bp) 415 { 416 struct md_s *sc; 417 418 sc = bp->bio_to->geom->softc; 419 if ((bp->bio_cmd == BIO_READ) || (bp->bio_cmd == BIO_WRITE)) { 420 mtx_lock(&sc->stat_mtx); 421 devstat_start_transaction_bio(sc->devstat, bp); 422 mtx_unlock(&sc->stat_mtx); 423 } 424 mtx_lock(&sc->queue_mtx); 425 bioq_disksort(&sc->bio_queue, bp); 426 mtx_unlock(&sc->queue_mtx); 427 wakeup(sc); 428 } 429 430 #define MD_MALLOC_MOVE_ZERO 1 431 #define MD_MALLOC_MOVE_FILL 2 432 #define MD_MALLOC_MOVE_READ 3 433 #define MD_MALLOC_MOVE_WRITE 4 434 #define MD_MALLOC_MOVE_CMP 5 435 436 static int 437 md_malloc_move(vm_page_t **mp, int *ma_offs, unsigned sectorsize, 438 void *ptr, u_char fill, int op) 439 { 440 struct sf_buf *sf; 441 vm_page_t m, *mp1; 442 char *p, first; 443 off_t *uc; 444 unsigned n; 445 int error, i, ma_offs1, sz, first_read; 446 447 m = NULL; 448 error = 0; 449 sf = NULL; 450 /* if (op == MD_MALLOC_MOVE_CMP) { gcc */ 451 first = 0; 452 first_read = 0; 453 uc = ptr; 454 mp1 = *mp; 455 ma_offs1 = *ma_offs; 456 /* } */ 457 sched_pin(); 458 for (n = sectorsize; n != 0; n -= sz) { 459 sz = imin(PAGE_SIZE - *ma_offs, n); 460 if (m != **mp) { 461 if (sf != NULL) 462 sf_buf_free(sf); 463 m = **mp; 464 sf = sf_buf_alloc(m, SFB_CPUPRIVATE | 465 (md_malloc_wait ? 0 : SFB_NOWAIT)); 466 if (sf == NULL) { 467 error = ENOMEM; 468 break; 469 } 470 } 471 p = (char *)sf_buf_kva(sf) + *ma_offs; 472 switch (op) { 473 case MD_MALLOC_MOVE_ZERO: 474 bzero(p, sz); 475 break; 476 case MD_MALLOC_MOVE_FILL: 477 memset(p, fill, sz); 478 break; 479 case MD_MALLOC_MOVE_READ: 480 bcopy(ptr, p, sz); 481 cpu_flush_dcache(p, sz); 482 break; 483 case MD_MALLOC_MOVE_WRITE: 484 bcopy(p, ptr, sz); 485 break; 486 case MD_MALLOC_MOVE_CMP: 487 for (i = 0; i < sz; i++, p++) { 488 if (!first_read) { 489 *uc = (u_char)*p; 490 first = *p; 491 first_read = 1; 492 } else if (*p != first) { 493 error = EDOOFUS; 494 break; 495 } 496 } 497 break; 498 default: 499 KASSERT(0, ("md_malloc_move unknown op %d\n", op)); 500 break; 501 } 502 if (error != 0) 503 break; 504 *ma_offs += sz; 505 *ma_offs %= PAGE_SIZE; 506 if (*ma_offs == 0) 507 (*mp)++; 508 ptr = (char *)ptr + sz; 509 } 510 511 if (sf != NULL) 512 sf_buf_free(sf); 513 sched_unpin(); 514 if (op == MD_MALLOC_MOVE_CMP && error != 0) { 515 *mp = mp1; 516 *ma_offs = ma_offs1; 517 } 518 return (error); 519 } 520 521 static int 522 mdstart_malloc(struct md_s *sc, struct bio *bp) 523 { 524 u_char *dst; 525 vm_page_t *m; 526 int i, error, error1, ma_offs, notmapped; 527 off_t secno, nsec, uc; 528 uintptr_t sp, osp; 529 530 switch (bp->bio_cmd) { 531 case BIO_READ: 532 case BIO_WRITE: 533 case BIO_DELETE: 534 break; 535 default: 536 return (EOPNOTSUPP); 537 } 538 539 notmapped = (bp->bio_flags & BIO_UNMAPPED) != 0; 540 if (notmapped) { 541 m = bp->bio_ma; 542 ma_offs = bp->bio_ma_offset; 543 dst = NULL; 544 } else { 545 dst = bp->bio_data; 546 } 547 548 nsec = bp->bio_length / sc->sectorsize; 549 secno = bp->bio_offset / sc->sectorsize; 550 error = 0; 551 while (nsec--) { 552 osp = s_read(sc->indir, secno); 553 if (bp->bio_cmd == BIO_DELETE) { 554 if (osp != 0) 555 error = s_write(sc->indir, secno, 0); 556 } else if (bp->bio_cmd == BIO_READ) { 557 if (osp == 0) { 558 if (notmapped) { 559 error = md_malloc_move(&m, &ma_offs, 560 sc->sectorsize, NULL, 0, 561 MD_MALLOC_MOVE_ZERO); 562 } else 563 bzero(dst, sc->sectorsize); 564 } else if (osp <= 255) { 565 if (notmapped) { 566 error = md_malloc_move(&m, &ma_offs, 567 sc->sectorsize, NULL, osp, 568 MD_MALLOC_MOVE_FILL); 569 } else 570 memset(dst, osp, sc->sectorsize); 571 } else { 572 if (notmapped) { 573 error = md_malloc_move(&m, &ma_offs, 574 sc->sectorsize, (void *)osp, 0, 575 MD_MALLOC_MOVE_READ); 576 } else { 577 bcopy((void *)osp, dst, sc->sectorsize); 578 cpu_flush_dcache(dst, sc->sectorsize); 579 } 580 } 581 osp = 0; 582 } else if (bp->bio_cmd == BIO_WRITE) { 583 if (sc->flags & MD_COMPRESS) { 584 if (notmapped) { 585 error1 = md_malloc_move(&m, &ma_offs, 586 sc->sectorsize, &uc, 0, 587 MD_MALLOC_MOVE_CMP); 588 i = error1 == 0 ? sc->sectorsize : 0; 589 } else { 590 uc = dst[0]; 591 for (i = 1; i < sc->sectorsize; i++) { 592 if (dst[i] != uc) 593 break; 594 } 595 } 596 } else { 597 i = 0; 598 uc = 0; 599 } 600 if (i == sc->sectorsize) { 601 if (osp != uc) 602 error = s_write(sc->indir, secno, uc); 603 } else { 604 if (osp <= 255) { 605 sp = (uintptr_t)uma_zalloc(sc->uma, 606 md_malloc_wait ? M_WAITOK : 607 M_NOWAIT); 608 if (sp == 0) { 609 error = ENOSPC; 610 break; 611 } 612 if (notmapped) { 613 error = md_malloc_move(&m, 614 &ma_offs, sc->sectorsize, 615 (void *)sp, 0, 616 MD_MALLOC_MOVE_WRITE); 617 } else { 618 bcopy(dst, (void *)sp, 619 sc->sectorsize); 620 } 621 error = s_write(sc->indir, secno, sp); 622 } else { 623 if (notmapped) { 624 error = md_malloc_move(&m, 625 &ma_offs, sc->sectorsize, 626 (void *)osp, 0, 627 MD_MALLOC_MOVE_WRITE); 628 } else { 629 bcopy(dst, (void *)osp, 630 sc->sectorsize); 631 } 632 osp = 0; 633 } 634 } 635 } else { 636 error = EOPNOTSUPP; 637 } 638 if (osp > 255) 639 uma_zfree(sc->uma, (void*)osp); 640 if (error != 0) 641 break; 642 secno++; 643 if (!notmapped) 644 dst += sc->sectorsize; 645 } 646 bp->bio_resid = 0; 647 return (error); 648 } 649 650 static int 651 mdstart_preload(struct md_s *sc, struct bio *bp) 652 { 653 654 switch (bp->bio_cmd) { 655 case BIO_READ: 656 bcopy(sc->pl_ptr + bp->bio_offset, bp->bio_data, 657 bp->bio_length); 658 cpu_flush_dcache(bp->bio_data, bp->bio_length); 659 break; 660 case BIO_WRITE: 661 bcopy(bp->bio_data, sc->pl_ptr + bp->bio_offset, 662 bp->bio_length); 663 break; 664 } 665 bp->bio_resid = 0; 666 return (0); 667 } 668 669 static int 670 mdstart_vnode(struct md_s *sc, struct bio *bp) 671 { 672 int error; 673 struct uio auio; 674 struct iovec aiov; 675 struct mount *mp; 676 struct vnode *vp; 677 struct buf *pb; 678 struct thread *td; 679 off_t end, zerosize; 680 681 switch (bp->bio_cmd) { 682 case BIO_READ: 683 case BIO_WRITE: 684 case BIO_DELETE: 685 case BIO_FLUSH: 686 break; 687 default: 688 return (EOPNOTSUPP); 689 } 690 691 td = curthread; 692 vp = sc->vnode; 693 694 /* 695 * VNODE I/O 696 * 697 * If an error occurs, we set BIO_ERROR but we do not set 698 * B_INVAL because (for a write anyway), the buffer is 699 * still valid. 700 */ 701 702 if (bp->bio_cmd == BIO_FLUSH) { 703 (void) vn_start_write(vp, &mp, V_WAIT); 704 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 705 error = VOP_FSYNC(vp, MNT_WAIT, td); 706 VOP_UNLOCK(vp, 0); 707 vn_finished_write(mp); 708 return (error); 709 } 710 711 bzero(&auio, sizeof(auio)); 712 713 /* 714 * Special case for BIO_DELETE. On the surface, this is very 715 * similar to BIO_WRITE, except that we write from our own 716 * fixed-length buffer, so we have to loop. The net result is 717 * that the two cases end up having very little in common. 718 */ 719 if (bp->bio_cmd == BIO_DELETE) { 720 zerosize = ZERO_REGION_SIZE - 721 (ZERO_REGION_SIZE % sc->sectorsize); 722 auio.uio_iov = &aiov; 723 auio.uio_iovcnt = 1; 724 auio.uio_offset = (vm_ooffset_t)bp->bio_offset; 725 auio.uio_segflg = UIO_SYSSPACE; 726 auio.uio_rw = UIO_WRITE; 727 auio.uio_td = td; 728 end = bp->bio_offset + bp->bio_length; 729 (void) vn_start_write(vp, &mp, V_WAIT); 730 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 731 error = 0; 732 while (auio.uio_offset < end) { 733 aiov.iov_base = __DECONST(void *, zero_region); 734 aiov.iov_len = end - auio.uio_offset; 735 if (aiov.iov_len > zerosize) 736 aiov.iov_len = zerosize; 737 auio.uio_resid = aiov.iov_len; 738 error = VOP_WRITE(vp, &auio, 739 sc->flags & MD_ASYNC ? 0 : IO_SYNC, sc->cred); 740 if (error != 0) 741 break; 742 } 743 VOP_UNLOCK(vp, 0); 744 vn_finished_write(mp); 745 bp->bio_resid = end - auio.uio_offset; 746 return (error); 747 } 748 749 KASSERT(bp->bio_length <= MAXPHYS, ("bio_length %jd", 750 (uintmax_t)bp->bio_length)); 751 if ((bp->bio_flags & BIO_UNMAPPED) == 0) { 752 pb = NULL; 753 aiov.iov_base = bp->bio_data; 754 } else { 755 pb = getpbuf(&md_vnode_pbuf_freecnt); 756 pmap_qenter((vm_offset_t)pb->b_data, bp->bio_ma, bp->bio_ma_n); 757 aiov.iov_base = (void *)((vm_offset_t)pb->b_data + 758 bp->bio_ma_offset); 759 } 760 aiov.iov_len = bp->bio_length; 761 auio.uio_iov = &aiov; 762 auio.uio_iovcnt = 1; 763 auio.uio_offset = (vm_ooffset_t)bp->bio_offset; 764 auio.uio_segflg = UIO_SYSSPACE; 765 if (bp->bio_cmd == BIO_READ) 766 auio.uio_rw = UIO_READ; 767 else if (bp->bio_cmd == BIO_WRITE) 768 auio.uio_rw = UIO_WRITE; 769 else 770 panic("wrong BIO_OP in mdstart_vnode"); 771 auio.uio_resid = bp->bio_length; 772 auio.uio_td = td; 773 /* 774 * When reading set IO_DIRECT to try to avoid double-caching 775 * the data. When writing IO_DIRECT is not optimal. 776 */ 777 if (bp->bio_cmd == BIO_READ) { 778 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 779 error = VOP_READ(vp, &auio, IO_DIRECT, sc->cred); 780 VOP_UNLOCK(vp, 0); 781 } else { 782 (void) vn_start_write(vp, &mp, V_WAIT); 783 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 784 error = VOP_WRITE(vp, &auio, sc->flags & MD_ASYNC ? 0 : IO_SYNC, 785 sc->cred); 786 VOP_UNLOCK(vp, 0); 787 vn_finished_write(mp); 788 } 789 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 790 pmap_qremove((vm_offset_t)pb->b_data, bp->bio_ma_n); 791 relpbuf(pb, &md_vnode_pbuf_freecnt); 792 } 793 bp->bio_resid = auio.uio_resid; 794 return (error); 795 } 796 797 static int 798 mdstart_swap(struct md_s *sc, struct bio *bp) 799 { 800 vm_page_t m; 801 u_char *p; 802 vm_pindex_t i, lastp; 803 int rv, ma_offs, offs, len, lastend; 804 805 switch (bp->bio_cmd) { 806 case BIO_READ: 807 case BIO_WRITE: 808 case BIO_DELETE: 809 break; 810 default: 811 return (EOPNOTSUPP); 812 } 813 814 p = bp->bio_data; 815 ma_offs = (bp->bio_flags & BIO_UNMAPPED) == 0 ? 0 : bp->bio_ma_offset; 816 817 /* 818 * offs is the offset at which to start operating on the 819 * next (ie, first) page. lastp is the last page on 820 * which we're going to operate. lastend is the ending 821 * position within that last page (ie, PAGE_SIZE if 822 * we're operating on complete aligned pages). 823 */ 824 offs = bp->bio_offset % PAGE_SIZE; 825 lastp = (bp->bio_offset + bp->bio_length - 1) / PAGE_SIZE; 826 lastend = (bp->bio_offset + bp->bio_length - 1) % PAGE_SIZE + 1; 827 828 rv = VM_PAGER_OK; 829 VM_OBJECT_WLOCK(sc->object); 830 vm_object_pip_add(sc->object, 1); 831 for (i = bp->bio_offset / PAGE_SIZE; i <= lastp; i++) { 832 len = ((i == lastp) ? lastend : PAGE_SIZE) - offs; 833 m = vm_page_grab(sc->object, i, VM_ALLOC_SYSTEM); 834 if (bp->bio_cmd == BIO_READ) { 835 if (m->valid == VM_PAGE_BITS_ALL) 836 rv = VM_PAGER_OK; 837 else 838 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 839 if (rv == VM_PAGER_ERROR) { 840 vm_page_xunbusy(m); 841 break; 842 } else if (rv == VM_PAGER_FAIL) { 843 /* 844 * Pager does not have the page. Zero 845 * the allocated page, and mark it as 846 * valid. Do not set dirty, the page 847 * can be recreated if thrown out. 848 */ 849 pmap_zero_page(m); 850 m->valid = VM_PAGE_BITS_ALL; 851 } 852 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 853 pmap_copy_pages(&m, offs, bp->bio_ma, 854 ma_offs, len); 855 } else { 856 physcopyout(VM_PAGE_TO_PHYS(m) + offs, p, len); 857 cpu_flush_dcache(p, len); 858 } 859 } else if (bp->bio_cmd == BIO_WRITE) { 860 if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL) 861 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 862 else 863 rv = VM_PAGER_OK; 864 if (rv == VM_PAGER_ERROR) { 865 vm_page_xunbusy(m); 866 break; 867 } 868 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 869 pmap_copy_pages(bp->bio_ma, ma_offs, &m, 870 offs, len); 871 } else { 872 physcopyin(p, VM_PAGE_TO_PHYS(m) + offs, len); 873 } 874 m->valid = VM_PAGE_BITS_ALL; 875 } else if (bp->bio_cmd == BIO_DELETE) { 876 if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL) 877 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 878 else 879 rv = VM_PAGER_OK; 880 if (rv == VM_PAGER_ERROR) { 881 vm_page_xunbusy(m); 882 break; 883 } 884 if (len != PAGE_SIZE) { 885 pmap_zero_page_area(m, offs, len); 886 vm_page_clear_dirty(m, offs, len); 887 m->valid = VM_PAGE_BITS_ALL; 888 } else 889 vm_pager_page_unswapped(m); 890 } 891 vm_page_xunbusy(m); 892 vm_page_lock(m); 893 if (bp->bio_cmd == BIO_DELETE && len == PAGE_SIZE) 894 vm_page_free(m); 895 else 896 vm_page_activate(m); 897 vm_page_unlock(m); 898 if (bp->bio_cmd == BIO_WRITE) 899 vm_page_dirty(m); 900 901 /* Actions on further pages start at offset 0 */ 902 p += PAGE_SIZE - offs; 903 offs = 0; 904 ma_offs += len; 905 } 906 vm_object_pip_subtract(sc->object, 1); 907 VM_OBJECT_WUNLOCK(sc->object); 908 return (rv != VM_PAGER_ERROR ? 0 : ENOSPC); 909 } 910 911 static void 912 md_kthread(void *arg) 913 { 914 struct md_s *sc; 915 struct bio *bp; 916 int error; 917 918 sc = arg; 919 thread_lock(curthread); 920 sched_prio(curthread, PRIBIO); 921 thread_unlock(curthread); 922 if (sc->type == MD_VNODE) 923 curthread->td_pflags |= TDP_NORUNNINGBUF; 924 925 for (;;) { 926 mtx_lock(&sc->queue_mtx); 927 if (sc->flags & MD_SHUTDOWN) { 928 sc->flags |= MD_EXITING; 929 mtx_unlock(&sc->queue_mtx); 930 kproc_exit(0); 931 } 932 bp = bioq_takefirst(&sc->bio_queue); 933 if (!bp) { 934 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 935 continue; 936 } 937 mtx_unlock(&sc->queue_mtx); 938 if (bp->bio_cmd == BIO_GETATTR) { 939 if ((sc->fwsectors && sc->fwheads && 940 (g_handleattr_int(bp, "GEOM::fwsectors", 941 sc->fwsectors) || 942 g_handleattr_int(bp, "GEOM::fwheads", 943 sc->fwheads))) || 944 g_handleattr_int(bp, "GEOM::candelete", 1)) 945 error = -1; 946 else 947 error = EOPNOTSUPP; 948 } else { 949 error = sc->start(sc, bp); 950 } 951 952 if (error != -1) { 953 bp->bio_completed = bp->bio_length; 954 if ((bp->bio_cmd == BIO_READ) || (bp->bio_cmd == BIO_WRITE)) 955 devstat_end_transaction_bio(sc->devstat, bp); 956 g_io_deliver(bp, error); 957 } 958 } 959 } 960 961 static struct md_s * 962 mdfind(int unit) 963 { 964 struct md_s *sc; 965 966 LIST_FOREACH(sc, &md_softc_list, list) { 967 if (sc->unit == unit) 968 break; 969 } 970 return (sc); 971 } 972 973 static struct md_s * 974 mdnew(int unit, int *errp, enum md_types type) 975 { 976 struct md_s *sc; 977 int error; 978 979 *errp = 0; 980 if (unit == -1) 981 unit = alloc_unr(md_uh); 982 else 983 unit = alloc_unr_specific(md_uh, unit); 984 985 if (unit == -1) { 986 *errp = EBUSY; 987 return (NULL); 988 } 989 990 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 991 sc->type = type; 992 bioq_init(&sc->bio_queue); 993 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 994 mtx_init(&sc->stat_mtx, "md stat", NULL, MTX_DEF); 995 sc->unit = unit; 996 sprintf(sc->name, "md%d", unit); 997 LIST_INSERT_HEAD(&md_softc_list, sc, list); 998 error = kproc_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 999 if (error == 0) 1000 return (sc); 1001 LIST_REMOVE(sc, list); 1002 mtx_destroy(&sc->stat_mtx); 1003 mtx_destroy(&sc->queue_mtx); 1004 free_unr(md_uh, sc->unit); 1005 free(sc, M_MD); 1006 *errp = error; 1007 return (NULL); 1008 } 1009 1010 static void 1011 mdinit(struct md_s *sc) 1012 { 1013 struct g_geom *gp; 1014 struct g_provider *pp; 1015 1016 g_topology_lock(); 1017 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 1018 gp->softc = sc; 1019 pp = g_new_providerf(gp, "md%d", sc->unit); 1020 pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE; 1021 pp->mediasize = sc->mediasize; 1022 pp->sectorsize = sc->sectorsize; 1023 switch (sc->type) { 1024 case MD_MALLOC: 1025 case MD_VNODE: 1026 case MD_SWAP: 1027 pp->flags |= G_PF_ACCEPT_UNMAPPED; 1028 break; 1029 case MD_PRELOAD: 1030 break; 1031 } 1032 sc->gp = gp; 1033 sc->pp = pp; 1034 g_error_provider(pp, 0); 1035 g_topology_unlock(); 1036 sc->devstat = devstat_new_entry("md", sc->unit, sc->sectorsize, 1037 DEVSTAT_ALL_SUPPORTED, DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 1038 } 1039 1040 static int 1041 mdcreate_malloc(struct md_s *sc, struct md_ioctl *mdio) 1042 { 1043 uintptr_t sp; 1044 int error; 1045 off_t u; 1046 1047 error = 0; 1048 if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 1049 return (EINVAL); 1050 if (mdio->md_sectorsize != 0 && !powerof2(mdio->md_sectorsize)) 1051 return (EINVAL); 1052 /* Compression doesn't make sense if we have reserved space */ 1053 if (mdio->md_options & MD_RESERVE) 1054 mdio->md_options &= ~MD_COMPRESS; 1055 if (mdio->md_fwsectors != 0) 1056 sc->fwsectors = mdio->md_fwsectors; 1057 if (mdio->md_fwheads != 0) 1058 sc->fwheads = mdio->md_fwheads; 1059 sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE); 1060 sc->indir = dimension(sc->mediasize / sc->sectorsize); 1061 sc->uma = uma_zcreate(sc->name, sc->sectorsize, NULL, NULL, NULL, NULL, 1062 0x1ff, 0); 1063 if (mdio->md_options & MD_RESERVE) { 1064 off_t nsectors; 1065 1066 nsectors = sc->mediasize / sc->sectorsize; 1067 for (u = 0; u < nsectors; u++) { 1068 sp = (uintptr_t)uma_zalloc(sc->uma, (md_malloc_wait ? 1069 M_WAITOK : M_NOWAIT) | M_ZERO); 1070 if (sp != 0) 1071 error = s_write(sc->indir, u, sp); 1072 else 1073 error = ENOMEM; 1074 if (error != 0) 1075 break; 1076 } 1077 } 1078 return (error); 1079 } 1080 1081 1082 static int 1083 mdsetcred(struct md_s *sc, struct ucred *cred) 1084 { 1085 char *tmpbuf; 1086 int error = 0; 1087 1088 /* 1089 * Set credits in our softc 1090 */ 1091 1092 if (sc->cred) 1093 crfree(sc->cred); 1094 sc->cred = crhold(cred); 1095 1096 /* 1097 * Horrible kludge to establish credentials for NFS XXX. 1098 */ 1099 1100 if (sc->vnode) { 1101 struct uio auio; 1102 struct iovec aiov; 1103 1104 tmpbuf = malloc(sc->sectorsize, M_TEMP, M_WAITOK); 1105 bzero(&auio, sizeof(auio)); 1106 1107 aiov.iov_base = tmpbuf; 1108 aiov.iov_len = sc->sectorsize; 1109 auio.uio_iov = &aiov; 1110 auio.uio_iovcnt = 1; 1111 auio.uio_offset = 0; 1112 auio.uio_rw = UIO_READ; 1113 auio.uio_segflg = UIO_SYSSPACE; 1114 auio.uio_resid = aiov.iov_len; 1115 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY); 1116 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 1117 VOP_UNLOCK(sc->vnode, 0); 1118 free(tmpbuf, M_TEMP); 1119 } 1120 return (error); 1121 } 1122 1123 static int 1124 mdcreate_vnode(struct md_s *sc, struct md_ioctl *mdio, struct thread *td) 1125 { 1126 struct vattr vattr; 1127 struct nameidata nd; 1128 char *fname; 1129 int error, flags; 1130 1131 /* 1132 * Kernel-originated requests must have the filename appended 1133 * to the mdio structure to protect against malicious software. 1134 */ 1135 fname = mdio->md_file; 1136 if ((void *)fname != (void *)(mdio + 1)) { 1137 error = copyinstr(fname, sc->file, sizeof(sc->file), NULL); 1138 if (error != 0) 1139 return (error); 1140 } else 1141 strlcpy(sc->file, fname, sizeof(sc->file)); 1142 1143 /* 1144 * If the user specified that this is a read only device, don't 1145 * set the FWRITE mask before trying to open the backing store. 1146 */ 1147 flags = FREAD | ((mdio->md_options & MD_READONLY) ? 0 : FWRITE); 1148 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, sc->file, td); 1149 error = vn_open(&nd, &flags, 0, NULL); 1150 if (error != 0) 1151 return (error); 1152 NDFREE(&nd, NDF_ONLY_PNBUF); 1153 if (nd.ni_vp->v_type != VREG) { 1154 error = EINVAL; 1155 goto bad; 1156 } 1157 error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred); 1158 if (error != 0) 1159 goto bad; 1160 if (VOP_ISLOCKED(nd.ni_vp) != LK_EXCLUSIVE) { 1161 vn_lock(nd.ni_vp, LK_UPGRADE | LK_RETRY); 1162 if (nd.ni_vp->v_iflag & VI_DOOMED) { 1163 /* Forced unmount. */ 1164 error = EBADF; 1165 goto bad; 1166 } 1167 } 1168 nd.ni_vp->v_vflag |= VV_MD; 1169 VOP_UNLOCK(nd.ni_vp, 0); 1170 1171 if (mdio->md_fwsectors != 0) 1172 sc->fwsectors = mdio->md_fwsectors; 1173 if (mdio->md_fwheads != 0) 1174 sc->fwheads = mdio->md_fwheads; 1175 sc->flags = mdio->md_options & (MD_FORCE | MD_ASYNC); 1176 if (!(flags & FWRITE)) 1177 sc->flags |= MD_READONLY; 1178 sc->vnode = nd.ni_vp; 1179 1180 error = mdsetcred(sc, td->td_ucred); 1181 if (error != 0) { 1182 sc->vnode = NULL; 1183 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY); 1184 nd.ni_vp->v_vflag &= ~VV_MD; 1185 goto bad; 1186 } 1187 return (0); 1188 bad: 1189 VOP_UNLOCK(nd.ni_vp, 0); 1190 (void)vn_close(nd.ni_vp, flags, td->td_ucred, td); 1191 return (error); 1192 } 1193 1194 static int 1195 mddestroy(struct md_s *sc, struct thread *td) 1196 { 1197 1198 if (sc->gp) { 1199 sc->gp->softc = NULL; 1200 g_topology_lock(); 1201 g_wither_geom(sc->gp, ENXIO); 1202 g_topology_unlock(); 1203 sc->gp = NULL; 1204 sc->pp = NULL; 1205 } 1206 if (sc->devstat) { 1207 devstat_remove_entry(sc->devstat); 1208 sc->devstat = NULL; 1209 } 1210 mtx_lock(&sc->queue_mtx); 1211 sc->flags |= MD_SHUTDOWN; 1212 wakeup(sc); 1213 while (!(sc->flags & MD_EXITING)) 1214 msleep(sc->procp, &sc->queue_mtx, PRIBIO, "mddestroy", hz / 10); 1215 mtx_unlock(&sc->queue_mtx); 1216 mtx_destroy(&sc->stat_mtx); 1217 mtx_destroy(&sc->queue_mtx); 1218 if (sc->vnode != NULL) { 1219 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY); 1220 sc->vnode->v_vflag &= ~VV_MD; 1221 VOP_UNLOCK(sc->vnode, 0); 1222 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 1223 FREAD : (FREAD|FWRITE), sc->cred, td); 1224 } 1225 if (sc->cred != NULL) 1226 crfree(sc->cred); 1227 if (sc->object != NULL) 1228 vm_object_deallocate(sc->object); 1229 if (sc->indir) 1230 destroy_indir(sc, sc->indir); 1231 if (sc->uma) 1232 uma_zdestroy(sc->uma); 1233 1234 LIST_REMOVE(sc, list); 1235 free_unr(md_uh, sc->unit); 1236 free(sc, M_MD); 1237 return (0); 1238 } 1239 1240 static int 1241 mdresize(struct md_s *sc, struct md_ioctl *mdio) 1242 { 1243 int error, res; 1244 vm_pindex_t oldpages, newpages; 1245 1246 switch (sc->type) { 1247 case MD_VNODE: 1248 break; 1249 case MD_SWAP: 1250 if (mdio->md_mediasize <= 0 || 1251 (mdio->md_mediasize % PAGE_SIZE) != 0) 1252 return (EDOM); 1253 oldpages = OFF_TO_IDX(round_page(sc->mediasize)); 1254 newpages = OFF_TO_IDX(round_page(mdio->md_mediasize)); 1255 if (newpages < oldpages) { 1256 VM_OBJECT_WLOCK(sc->object); 1257 vm_object_page_remove(sc->object, newpages, 0, 0); 1258 swap_pager_freespace(sc->object, newpages, 1259 oldpages - newpages); 1260 swap_release_by_cred(IDX_TO_OFF(oldpages - 1261 newpages), sc->cred); 1262 sc->object->charge = IDX_TO_OFF(newpages); 1263 sc->object->size = newpages; 1264 VM_OBJECT_WUNLOCK(sc->object); 1265 } else if (newpages > oldpages) { 1266 res = swap_reserve_by_cred(IDX_TO_OFF(newpages - 1267 oldpages), sc->cred); 1268 if (!res) 1269 return (ENOMEM); 1270 if ((mdio->md_options & MD_RESERVE) || 1271 (sc->flags & MD_RESERVE)) { 1272 error = swap_pager_reserve(sc->object, 1273 oldpages, newpages - oldpages); 1274 if (error < 0) { 1275 swap_release_by_cred( 1276 IDX_TO_OFF(newpages - oldpages), 1277 sc->cred); 1278 return (EDOM); 1279 } 1280 } 1281 VM_OBJECT_WLOCK(sc->object); 1282 sc->object->charge = IDX_TO_OFF(newpages); 1283 sc->object->size = newpages; 1284 VM_OBJECT_WUNLOCK(sc->object); 1285 } 1286 break; 1287 default: 1288 return (EOPNOTSUPP); 1289 } 1290 1291 sc->mediasize = mdio->md_mediasize; 1292 g_topology_lock(); 1293 g_resize_provider(sc->pp, sc->mediasize); 1294 g_topology_unlock(); 1295 return (0); 1296 } 1297 1298 static int 1299 mdcreate_swap(struct md_s *sc, struct md_ioctl *mdio, struct thread *td) 1300 { 1301 vm_ooffset_t npage; 1302 int error; 1303 1304 /* 1305 * Range check. Disallow negative sizes or any size less then the 1306 * size of a page. Then round to a page. 1307 */ 1308 if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0) 1309 return (EDOM); 1310 1311 /* 1312 * Allocate an OBJT_SWAP object. 1313 * 1314 * Note the truncation. 1315 */ 1316 1317 npage = mdio->md_mediasize / PAGE_SIZE; 1318 if (mdio->md_fwsectors != 0) 1319 sc->fwsectors = mdio->md_fwsectors; 1320 if (mdio->md_fwheads != 0) 1321 sc->fwheads = mdio->md_fwheads; 1322 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * npage, 1323 VM_PROT_DEFAULT, 0, td->td_ucred); 1324 if (sc->object == NULL) 1325 return (ENOMEM); 1326 sc->flags = mdio->md_options & (MD_FORCE | MD_RESERVE); 1327 if (mdio->md_options & MD_RESERVE) { 1328 if (swap_pager_reserve(sc->object, 0, npage) < 0) { 1329 error = EDOM; 1330 goto finish; 1331 } 1332 } 1333 error = mdsetcred(sc, td->td_ucred); 1334 finish: 1335 if (error != 0) { 1336 vm_object_deallocate(sc->object); 1337 sc->object = NULL; 1338 } 1339 return (error); 1340 } 1341 1342 1343 static int 1344 xmdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 1345 { 1346 struct md_ioctl *mdio; 1347 struct md_s *sc; 1348 int error, i; 1349 unsigned sectsize; 1350 1351 if (md_debug) 1352 printf("mdctlioctl(%s %lx %p %x %p)\n", 1353 devtoname(dev), cmd, addr, flags, td); 1354 1355 mdio = (struct md_ioctl *)addr; 1356 if (mdio->md_version != MDIOVERSION) 1357 return (EINVAL); 1358 1359 /* 1360 * We assert the version number in the individual ioctl 1361 * handlers instead of out here because (a) it is possible we 1362 * may add another ioctl in the future which doesn't read an 1363 * mdio, and (b) the correct return value for an unknown ioctl 1364 * is ENOIOCTL, not EINVAL. 1365 */ 1366 error = 0; 1367 switch (cmd) { 1368 case MDIOCATTACH: 1369 switch (mdio->md_type) { 1370 case MD_MALLOC: 1371 case MD_PRELOAD: 1372 case MD_VNODE: 1373 case MD_SWAP: 1374 break; 1375 default: 1376 return (EINVAL); 1377 } 1378 if (mdio->md_sectorsize == 0) 1379 sectsize = DEV_BSIZE; 1380 else 1381 sectsize = mdio->md_sectorsize; 1382 if (sectsize > MAXPHYS || mdio->md_mediasize < sectsize) 1383 return (EINVAL); 1384 if (mdio->md_options & MD_AUTOUNIT) 1385 sc = mdnew(-1, &error, mdio->md_type); 1386 else { 1387 if (mdio->md_unit > INT_MAX) 1388 return (EINVAL); 1389 sc = mdnew(mdio->md_unit, &error, mdio->md_type); 1390 } 1391 if (sc == NULL) 1392 return (error); 1393 if (mdio->md_options & MD_AUTOUNIT) 1394 mdio->md_unit = sc->unit; 1395 sc->mediasize = mdio->md_mediasize; 1396 sc->sectorsize = sectsize; 1397 error = EDOOFUS; 1398 switch (sc->type) { 1399 case MD_MALLOC: 1400 sc->start = mdstart_malloc; 1401 error = mdcreate_malloc(sc, mdio); 1402 break; 1403 case MD_PRELOAD: 1404 /* 1405 * We disallow attaching preloaded memory disks via 1406 * ioctl. Preloaded memory disks are automatically 1407 * attached in g_md_init(). 1408 */ 1409 error = EOPNOTSUPP; 1410 break; 1411 case MD_VNODE: 1412 sc->start = mdstart_vnode; 1413 error = mdcreate_vnode(sc, mdio, td); 1414 break; 1415 case MD_SWAP: 1416 sc->start = mdstart_swap; 1417 error = mdcreate_swap(sc, mdio, td); 1418 break; 1419 } 1420 if (error != 0) { 1421 mddestroy(sc, td); 1422 return (error); 1423 } 1424 1425 /* Prune off any residual fractional sector */ 1426 i = sc->mediasize % sc->sectorsize; 1427 sc->mediasize -= i; 1428 1429 mdinit(sc); 1430 return (0); 1431 case MDIOCDETACH: 1432 if (mdio->md_mediasize != 0 || 1433 (mdio->md_options & ~MD_FORCE) != 0) 1434 return (EINVAL); 1435 1436 sc = mdfind(mdio->md_unit); 1437 if (sc == NULL) 1438 return (ENOENT); 1439 if (sc->opencount != 0 && !(sc->flags & MD_FORCE) && 1440 !(mdio->md_options & MD_FORCE)) 1441 return (EBUSY); 1442 return (mddestroy(sc, td)); 1443 case MDIOCRESIZE: 1444 if ((mdio->md_options & ~(MD_FORCE | MD_RESERVE)) != 0) 1445 return (EINVAL); 1446 1447 sc = mdfind(mdio->md_unit); 1448 if (sc == NULL) 1449 return (ENOENT); 1450 if (mdio->md_mediasize < sc->sectorsize) 1451 return (EINVAL); 1452 if (mdio->md_mediasize < sc->mediasize && 1453 !(sc->flags & MD_FORCE) && 1454 !(mdio->md_options & MD_FORCE)) 1455 return (EBUSY); 1456 return (mdresize(sc, mdio)); 1457 case MDIOCQUERY: 1458 sc = mdfind(mdio->md_unit); 1459 if (sc == NULL) 1460 return (ENOENT); 1461 mdio->md_type = sc->type; 1462 mdio->md_options = sc->flags; 1463 mdio->md_mediasize = sc->mediasize; 1464 mdio->md_sectorsize = sc->sectorsize; 1465 if (sc->type == MD_VNODE) 1466 error = copyout(sc->file, mdio->md_file, 1467 strlen(sc->file) + 1); 1468 return (error); 1469 case MDIOCLIST: 1470 i = 1; 1471 LIST_FOREACH(sc, &md_softc_list, list) { 1472 if (i == MDNPAD - 1) 1473 mdio->md_pad[i] = -1; 1474 else 1475 mdio->md_pad[i++] = sc->unit; 1476 } 1477 mdio->md_pad[0] = i - 1; 1478 return (0); 1479 default: 1480 return (ENOIOCTL); 1481 }; 1482 } 1483 1484 static int 1485 mdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 1486 { 1487 int error; 1488 1489 sx_xlock(&md_sx); 1490 error = xmdctlioctl(dev, cmd, addr, flags, td); 1491 sx_xunlock(&md_sx); 1492 return (error); 1493 } 1494 1495 static void 1496 md_preloaded(u_char *image, size_t length, const char *name) 1497 { 1498 struct md_s *sc; 1499 int error; 1500 1501 sc = mdnew(-1, &error, MD_PRELOAD); 1502 if (sc == NULL) 1503 return; 1504 sc->mediasize = length; 1505 sc->sectorsize = DEV_BSIZE; 1506 sc->pl_ptr = image; 1507 sc->pl_len = length; 1508 sc->start = mdstart_preload; 1509 #ifdef MD_ROOT 1510 if (sc->unit == 0) 1511 rootdevnames[0] = MD_ROOT_FSTYPE ":/dev/md0"; 1512 #endif 1513 mdinit(sc); 1514 if (name != NULL) { 1515 printf("%s%d: Preloaded image <%s> %zd bytes at %p\n", 1516 MD_NAME, sc->unit, name, length, image); 1517 } 1518 } 1519 1520 static void 1521 g_md_init(struct g_class *mp __unused) 1522 { 1523 caddr_t mod; 1524 u_char *ptr, *name, *type; 1525 unsigned len; 1526 int i; 1527 1528 /* figure out log2(NINDIR) */ 1529 for (i = NINDIR, nshift = -1; i; nshift++) 1530 i >>= 1; 1531 1532 mod = NULL; 1533 sx_init(&md_sx, "MD config lock"); 1534 g_topology_unlock(); 1535 md_uh = new_unrhdr(0, INT_MAX, NULL); 1536 #ifdef MD_ROOT_SIZE 1537 sx_xlock(&md_sx); 1538 md_preloaded(mfs_root.start, sizeof(mfs_root.start), NULL); 1539 sx_xunlock(&md_sx); 1540 #endif 1541 /* XXX: are preload_* static or do they need Giant ? */ 1542 while ((mod = preload_search_next_name(mod)) != NULL) { 1543 name = (char *)preload_search_info(mod, MODINFO_NAME); 1544 if (name == NULL) 1545 continue; 1546 type = (char *)preload_search_info(mod, MODINFO_TYPE); 1547 if (type == NULL) 1548 continue; 1549 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 1550 continue; 1551 ptr = preload_fetch_addr(mod); 1552 len = preload_fetch_size(mod); 1553 if (ptr != NULL && len != 0) { 1554 sx_xlock(&md_sx); 1555 md_preloaded(ptr, len, name); 1556 sx_xunlock(&md_sx); 1557 } 1558 } 1559 md_vnode_pbuf_freecnt = nswbuf / 10; 1560 status_dev = make_dev(&mdctl_cdevsw, INT_MAX, UID_ROOT, GID_WHEEL, 1561 0600, MDCTL_NAME); 1562 g_topology_lock(); 1563 } 1564 1565 static void 1566 g_md_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 1567 struct g_consumer *cp __unused, struct g_provider *pp) 1568 { 1569 struct md_s *mp; 1570 char *type; 1571 1572 mp = gp->softc; 1573 if (mp == NULL) 1574 return; 1575 1576 switch (mp->type) { 1577 case MD_MALLOC: 1578 type = "malloc"; 1579 break; 1580 case MD_PRELOAD: 1581 type = "preload"; 1582 break; 1583 case MD_VNODE: 1584 type = "vnode"; 1585 break; 1586 case MD_SWAP: 1587 type = "swap"; 1588 break; 1589 default: 1590 type = "unknown"; 1591 break; 1592 } 1593 1594 if (pp != NULL) { 1595 if (indent == NULL) { 1596 sbuf_printf(sb, " u %d", mp->unit); 1597 sbuf_printf(sb, " s %ju", (uintmax_t) mp->sectorsize); 1598 sbuf_printf(sb, " f %ju", (uintmax_t) mp->fwheads); 1599 sbuf_printf(sb, " fs %ju", (uintmax_t) mp->fwsectors); 1600 sbuf_printf(sb, " l %ju", (uintmax_t) mp->mediasize); 1601 sbuf_printf(sb, " t %s", type); 1602 if (mp->type == MD_VNODE && mp->vnode != NULL) 1603 sbuf_printf(sb, " file %s", mp->file); 1604 } else { 1605 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent, 1606 mp->unit); 1607 sbuf_printf(sb, "%s<sectorsize>%ju</sectorsize>\n", 1608 indent, (uintmax_t) mp->sectorsize); 1609 sbuf_printf(sb, "%s<fwheads>%ju</fwheads>\n", 1610 indent, (uintmax_t) mp->fwheads); 1611 sbuf_printf(sb, "%s<fwsectors>%ju</fwsectors>\n", 1612 indent, (uintmax_t) mp->fwsectors); 1613 sbuf_printf(sb, "%s<length>%ju</length>\n", 1614 indent, (uintmax_t) mp->mediasize); 1615 sbuf_printf(sb, "%s<compression>%s</compression>\n", indent, 1616 (mp->flags & MD_COMPRESS) == 0 ? "off": "on"); 1617 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 1618 (mp->flags & MD_READONLY) == 0 ? "read-write": 1619 "read-only"); 1620 sbuf_printf(sb, "%s<type>%s</type>\n", indent, 1621 type); 1622 if (mp->type == MD_VNODE && mp->vnode != NULL) 1623 sbuf_printf(sb, "%s<file>%s</file>\n", 1624 indent, mp->file); 1625 } 1626 } 1627 } 1628 1629 static void 1630 g_md_fini(struct g_class *mp __unused) 1631 { 1632 1633 sx_destroy(&md_sx); 1634 if (status_dev != NULL) 1635 destroy_dev(status_dev); 1636 delete_unrhdr(md_uh); 1637 } 1638