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sys/dev/md/md.c
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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 * 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/fcntl.h> 64 #include <sys/kernel.h> 65 #include <sys/kthread.h> 66 #include <sys/linker.h> 67 #include <sys/lock.h> 68 #include <sys/malloc.h> 69 #include <sys/mdioctl.h> 70 #include <sys/mount.h> 71 #include <sys/mutex.h> 72 #include <sys/sx.h> 73 #include <sys/namei.h> 74 #include <sys/proc.h> 75 #include <sys/queue.h> 76 #include <sys/sched.h> 77 #include <sys/sf_buf.h> 78 #include <sys/sysctl.h> 79 #include <sys/vnode.h> 80 81 #include <geom/geom.h> 82 83 #include <vm/vm.h> 84 #include <vm/vm_object.h> 85 #include <vm/vm_page.h> 86 #include <vm/vm_pager.h> 87 #include <vm/swap_pager.h> 88 #include <vm/uma.h> 89 90 #define MD_MODVER 1 91 92 #define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */ 93 #define MD_EXITING 0x20000 /* Worker thread is exiting. */ 94 95 #ifndef MD_NSECT 96 #define MD_NSECT (10000 * 2) 97 #endif 98 99 static MALLOC_DEFINE(M_MD, "md_disk", "Memory Disk"); 100 static MALLOC_DEFINE(M_MDSECT, "md_sectors", "Memory Disk Sectors"); 101 102 static int md_debug; 103 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, ""); 104 105 #if defined(MD_ROOT) && defined(MD_ROOT_SIZE) 106 /* 107 * Preloaded image gets put here. 108 * Applications that patch the object with the image can determine 109 * the size looking at the start and end markers (strings), 110 * so we want them contiguous. 111 */ 112 static struct { 113 u_char start[MD_ROOT_SIZE*1024]; 114 u_char end[128]; 115 } mfs_root = { 116 .start = "MFS Filesystem goes here", 117 .end = "MFS Filesystem had better STOP here", 118 }; 119 #endif 120 121 static g_init_t g_md_init; 122 static g_fini_t g_md_fini; 123 static g_start_t g_md_start; 124 static g_access_t g_md_access; 125 static void g_md_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 126 struct g_consumer *cp __unused, struct g_provider *pp); 127 128 static int mdunits; 129 static struct cdev *status_dev = 0; 130 static struct sx md_sx; 131 132 static d_ioctl_t mdctlioctl; 133 134 static struct cdevsw mdctl_cdevsw = { 135 .d_version = D_VERSION, 136 .d_ioctl = mdctlioctl, 137 .d_name = MD_NAME, 138 }; 139 140 struct g_class g_md_class = { 141 .name = "MD", 142 .version = G_VERSION, 143 .init = g_md_init, 144 .fini = g_md_fini, 145 .start = g_md_start, 146 .access = g_md_access, 147 .dumpconf = g_md_dumpconf, 148 }; 149 150 DECLARE_GEOM_CLASS(g_md_class, g_md); 151 152 153 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(&md_softc_list); 154 155 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 156 #define NMASK (NINDIR-1) 157 static int nshift; 158 159 struct indir { 160 uintptr_t *array; 161 u_int total; 162 u_int used; 163 u_int shift; 164 }; 165 166 struct md_s { 167 int unit; 168 LIST_ENTRY(md_s) list; 169 struct bio_queue_head bio_queue; 170 struct mtx queue_mtx; 171 struct cdev *dev; 172 enum md_types type; 173 off_t mediasize; 174 unsigned sectorsize; 175 unsigned opencount; 176 unsigned fwheads; 177 unsigned fwsectors; 178 unsigned flags; 179 char name[20]; 180 struct proc *procp; 181 struct g_geom *gp; 182 struct g_provider *pp; 183 int (*start)(struct md_s *sc, struct bio *bp); 184 185 /* MD_MALLOC related fields */ 186 struct indir *indir; 187 uma_zone_t uma; 188 189 /* MD_PRELOAD related fields */ 190 u_char *pl_ptr; 191 size_t pl_len; 192 193 /* MD_VNODE related fields */ 194 struct vnode *vnode; 195 char file[PATH_MAX]; 196 struct ucred *cred; 197 198 /* MD_SWAP related fields */ 199 vm_object_t object; 200 }; 201 202 static struct indir * 203 new_indir(u_int shift) 204 { 205 struct indir *ip; 206 207 ip = malloc(sizeof *ip, M_MD, M_NOWAIT | M_ZERO); 208 if (ip == NULL) 209 return (NULL); 210 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 211 M_MDSECT, M_NOWAIT | M_ZERO); 212 if (ip->array == NULL) { 213 free(ip, M_MD); 214 return (NULL); 215 } 216 ip->total = NINDIR; 217 ip->shift = shift; 218 return (ip); 219 } 220 221 static void 222 del_indir(struct indir *ip) 223 { 224 225 free(ip->array, M_MDSECT); 226 free(ip, M_MD); 227 } 228 229 static void 230 destroy_indir(struct md_s *sc, struct indir *ip) 231 { 232 int i; 233 234 for (i = 0; i < NINDIR; i++) { 235 if (!ip->array[i]) 236 continue; 237 if (ip->shift) 238 destroy_indir(sc, (struct indir*)(ip->array[i])); 239 else if (ip->array[i] > 255) 240 uma_zfree(sc->uma, (void *)(ip->array[i])); 241 } 242 del_indir(ip); 243 } 244 245 /* 246 * This function does the math and allocates the top level "indir" structure 247 * for a device of "size" sectors. 248 */ 249 250 static struct indir * 251 dimension(off_t size) 252 { 253 off_t rcnt; 254 struct indir *ip; 255 int i, layer; 256 257 rcnt = size; 258 layer = 0; 259 while (rcnt > NINDIR) { 260 rcnt /= NINDIR; 261 layer++; 262 } 263 /* figure out log2(NINDIR) */ 264 for (i = NINDIR, nshift = -1; i; nshift++) 265 i >>= 1; 266 267 /* 268 * XXX: the top layer is probably not fully populated, so we allocate 269 * too much space for ip->array in here. 270 */ 271 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO); 272 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 273 M_MDSECT, M_WAITOK | M_ZERO); 274 ip->total = NINDIR; 275 ip->shift = layer * nshift; 276 return (ip); 277 } 278 279 /* 280 * Read a given sector 281 */ 282 283 static uintptr_t 284 s_read(struct indir *ip, off_t offset) 285 { 286 struct indir *cip; 287 int idx; 288 uintptr_t up; 289 290 if (md_debug > 1) 291 printf("s_read(%jd)\n", (intmax_t)offset); 292 up = 0; 293 for (cip = ip; cip != NULL;) { 294 if (cip->shift) { 295 idx = (offset >> cip->shift) & NMASK; 296 up = cip->array[idx]; 297 cip = (struct indir *)up; 298 continue; 299 } 300 idx = offset & NMASK; 301 return (cip->array[idx]); 302 } 303 return (0); 304 } 305 306 /* 307 * Write a given sector, prune the tree if the value is 0 308 */ 309 310 static int 311 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 312 { 313 struct indir *cip, *lip[10]; 314 int idx, li; 315 uintptr_t up; 316 317 if (md_debug > 1) 318 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 319 up = 0; 320 li = 0; 321 cip = ip; 322 for (;;) { 323 lip[li++] = cip; 324 if (cip->shift) { 325 idx = (offset >> cip->shift) & NMASK; 326 up = cip->array[idx]; 327 if (up != 0) { 328 cip = (struct indir *)up; 329 continue; 330 } 331 /* Allocate branch */ 332 cip->array[idx] = 333 (uintptr_t)new_indir(cip->shift - nshift); 334 if (cip->array[idx] == 0) 335 return (ENOSPC); 336 cip->used++; 337 up = cip->array[idx]; 338 cip = (struct indir *)up; 339 continue; 340 } 341 /* leafnode */ 342 idx = offset & NMASK; 343 up = cip->array[idx]; 344 if (up != 0) 345 cip->used--; 346 cip->array[idx] = ptr; 347 if (ptr != 0) 348 cip->used++; 349 break; 350 } 351 if (cip->used != 0 || li == 1) 352 return (0); 353 li--; 354 while (cip->used == 0 && cip != ip) { 355 li--; 356 idx = (offset >> lip[li]->shift) & NMASK; 357 up = lip[li]->array[idx]; 358 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 359 del_indir(cip); 360 lip[li]->array[idx] = 0; 361 lip[li]->used--; 362 cip = lip[li]; 363 } 364 return (0); 365 } 366 367 368 static int 369 g_md_access(struct g_provider *pp, int r, int w, int e) 370 { 371 struct md_s *sc; 372 373 sc = pp->geom->softc; 374 if (sc == NULL) 375 return (ENXIO); 376 r += pp->acr; 377 w += pp->acw; 378 e += pp->ace; 379 if ((sc->flags & MD_READONLY) != 0 && w > 0) 380 return (EROFS); 381 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 382 sc->opencount = 1; 383 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 384 sc->opencount = 0; 385 } 386 return (0); 387 } 388 389 static void 390 g_md_start(struct bio *bp) 391 { 392 struct md_s *sc; 393 394 sc = bp->bio_to->geom->softc; 395 mtx_lock(&sc->queue_mtx); 396 bioq_disksort(&sc->bio_queue, bp); 397 mtx_unlock(&sc->queue_mtx); 398 wakeup(sc); 399 } 400 401 static int 402 mdstart_malloc(struct md_s *sc, struct bio *bp) 403 { 404 int i, error; 405 u_char *dst; 406 off_t secno, nsec, uc; 407 uintptr_t sp, osp; 408 409 switch (bp->bio_cmd) { 410 case BIO_READ: 411 case BIO_WRITE: 412 case BIO_DELETE: 413 break; 414 default: 415 return (EOPNOTSUPP); 416 } 417 418 nsec = bp->bio_length / sc->sectorsize; 419 secno = bp->bio_offset / sc->sectorsize; 420 dst = bp->bio_data; 421 error = 0; 422 while (nsec--) { 423 osp = s_read(sc->indir, secno); 424 if (bp->bio_cmd == BIO_DELETE) { 425 if (osp != 0) 426 error = s_write(sc->indir, secno, 0); 427 } else if (bp->bio_cmd == BIO_READ) { 428 if (osp == 0) 429 bzero(dst, sc->sectorsize); 430 else if (osp <= 255) 431 for (i = 0; i < sc->sectorsize; i++) 432 dst[i] = osp; 433 else 434 bcopy((void *)osp, dst, sc->sectorsize); 435 osp = 0; 436 } else if (bp->bio_cmd == BIO_WRITE) { 437 if (sc->flags & MD_COMPRESS) { 438 uc = dst[0]; 439 for (i = 1; i < sc->sectorsize; i++) 440 if (dst[i] != uc) 441 break; 442 } else { 443 i = 0; 444 uc = 0; 445 } 446 if (i == sc->sectorsize) { 447 if (osp != uc) 448 error = s_write(sc->indir, secno, uc); 449 } else { 450 if (osp <= 255) { 451 sp = (uintptr_t)uma_zalloc(sc->uma, 452 M_NOWAIT); 453 if (sp == 0) { 454 error = ENOSPC; 455 break; 456 } 457 bcopy(dst, (void *)sp, sc->sectorsize); 458 error = s_write(sc->indir, secno, sp); 459 } else { 460 bcopy(dst, (void *)osp, sc->sectorsize); 461 osp = 0; 462 } 463 } 464 } else { 465 error = EOPNOTSUPP; 466 } 467 if (osp > 255) 468 uma_zfree(sc->uma, (void*)osp); 469 if (error != 0) 470 break; 471 secno++; 472 dst += sc->sectorsize; 473 } 474 bp->bio_resid = 0; 475 return (error); 476 } 477 478 static int 479 mdstart_preload(struct md_s *sc, struct bio *bp) 480 { 481 482 switch (bp->bio_cmd) { 483 case BIO_READ: 484 bcopy(sc->pl_ptr + bp->bio_offset, bp->bio_data, 485 bp->bio_length); 486 break; 487 case BIO_WRITE: 488 bcopy(bp->bio_data, sc->pl_ptr + bp->bio_offset, 489 bp->bio_length); 490 break; 491 } 492 bp->bio_resid = 0; 493 return (0); 494 } 495 496 static int 497 mdstart_vnode(struct md_s *sc, struct bio *bp) 498 { 499 int error, vfslocked; 500 struct uio auio; 501 struct iovec aiov; 502 struct mount *mp; 503 struct vnode *vp; 504 struct thread *td; 505 506 switch (bp->bio_cmd) { 507 case BIO_READ: 508 case BIO_WRITE: 509 case BIO_FLUSH: 510 break; 511 default: 512 return (EOPNOTSUPP); 513 } 514 515 td = curthread; 516 vp = sc->vnode; 517 518 /* 519 * VNODE I/O 520 * 521 * If an error occurs, we set BIO_ERROR but we do not set 522 * B_INVAL because (for a write anyway), the buffer is 523 * still valid. 524 */ 525 526 if (bp->bio_cmd == BIO_FLUSH) { 527 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 528 (void) vn_start_write(vp, &mp, V_WAIT); 529 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 530 error = VOP_FSYNC(vp, MNT_WAIT, td); 531 VOP_UNLOCK(vp, 0, td); 532 vn_finished_write(mp); 533 VFS_UNLOCK_GIANT(vfslocked); 534 return (error); 535 } 536 537 bzero(&auio, sizeof(auio)); 538 539 aiov.iov_base = bp->bio_data; 540 aiov.iov_len = bp->bio_length; 541 auio.uio_iov = &aiov; 542 auio.uio_iovcnt = 1; 543 auio.uio_offset = (vm_ooffset_t)bp->bio_offset; 544 auio.uio_segflg = UIO_SYSSPACE; 545 if (bp->bio_cmd == BIO_READ) 546 auio.uio_rw = UIO_READ; 547 else if (bp->bio_cmd == BIO_WRITE) 548 auio.uio_rw = UIO_WRITE; 549 else 550 panic("wrong BIO_OP in mdstart_vnode"); 551 auio.uio_resid = bp->bio_length; 552 auio.uio_td = td; 553 /* 554 * When reading set IO_DIRECT to try to avoid double-caching 555 * the data. When writing IO_DIRECT is not optimal. 556 */ 557 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 558 if (bp->bio_cmd == BIO_READ) { 559 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 560 error = VOP_READ(vp, &auio, IO_DIRECT, sc->cred); 561 VOP_UNLOCK(vp, 0, td); 562 } else { 563 (void) vn_start_write(vp, &mp, V_WAIT); 564 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 565 error = VOP_WRITE(vp, &auio, sc->flags & MD_ASYNC ? 0 : IO_SYNC, 566 sc->cred); 567 VOP_UNLOCK(vp, 0, td); 568 vn_finished_write(mp); 569 } 570 VFS_UNLOCK_GIANT(vfslocked); 571 bp->bio_resid = auio.uio_resid; 572 return (error); 573 } 574 575 static int 576 mdstart_swap(struct md_s *sc, struct bio *bp) 577 { 578 struct sf_buf *sf; 579 int rv, offs, len, lastend; 580 vm_pindex_t i, lastp; 581 vm_page_t m; 582 u_char *p; 583 584 switch (bp->bio_cmd) { 585 case BIO_READ: 586 case BIO_WRITE: 587 case BIO_DELETE: 588 break; 589 default: 590 return (EOPNOTSUPP); 591 } 592 593 p = bp->bio_data; 594 595 /* 596 * offs is the offset at which to start operating on the 597 * next (ie, first) page. lastp is the last page on 598 * which we're going to operate. lastend is the ending 599 * position within that last page (ie, PAGE_SIZE if 600 * we're operating on complete aligned pages). 601 */ 602 offs = bp->bio_offset % PAGE_SIZE; 603 lastp = (bp->bio_offset + bp->bio_length - 1) / PAGE_SIZE; 604 lastend = (bp->bio_offset + bp->bio_length - 1) % PAGE_SIZE + 1; 605 606 rv = VM_PAGER_OK; 607 VM_OBJECT_LOCK(sc->object); 608 vm_object_pip_add(sc->object, 1); 609 for (i = bp->bio_offset / PAGE_SIZE; i <= lastp; i++) { 610 len = ((i == lastp) ? lastend : PAGE_SIZE) - offs; 611 612 m = vm_page_grab(sc->object, i, 613 VM_ALLOC_NORMAL|VM_ALLOC_RETRY); 614 VM_OBJECT_UNLOCK(sc->object); 615 sched_pin(); 616 sf = sf_buf_alloc(m, SFB_CPUPRIVATE); 617 VM_OBJECT_LOCK(sc->object); 618 if (bp->bio_cmd == BIO_READ) { 619 if (m->valid != VM_PAGE_BITS_ALL) 620 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 621 if (rv == VM_PAGER_ERROR) { 622 sf_buf_free(sf); 623 sched_unpin(); 624 vm_page_lock_queues(); 625 vm_page_wakeup(m); 626 vm_page_unlock_queues(); 627 break; 628 } 629 bcopy((void *)(sf_buf_kva(sf) + offs), p, len); 630 } else if (bp->bio_cmd == BIO_WRITE) { 631 if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL) 632 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 633 if (rv == VM_PAGER_ERROR) { 634 sf_buf_free(sf); 635 sched_unpin(); 636 vm_page_lock_queues(); 637 vm_page_wakeup(m); 638 vm_page_unlock_queues(); 639 break; 640 } 641 bcopy(p, (void *)(sf_buf_kva(sf) + offs), len); 642 m->valid = VM_PAGE_BITS_ALL; 643 #if 0 644 } else if (bp->bio_cmd == BIO_DELETE) { 645 if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL) 646 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 647 if (rv == VM_PAGER_ERROR) { 648 sf_buf_free(sf); 649 sched_unpin(); 650 vm_page_lock_queues(); 651 vm_page_wakeup(m); 652 vm_page_unlock_queues(); 653 break; 654 } 655 bzero((void *)(sf_buf_kva(sf) + offs), len); 656 vm_page_dirty(m); 657 m->valid = VM_PAGE_BITS_ALL; 658 #endif 659 } 660 sf_buf_free(sf); 661 sched_unpin(); 662 vm_page_lock_queues(); 663 vm_page_wakeup(m); 664 vm_page_activate(m); 665 if (bp->bio_cmd == BIO_WRITE) 666 vm_page_dirty(m); 667 vm_page_unlock_queues(); 668 669 /* Actions on further pages start at offset 0 */ 670 p += PAGE_SIZE - offs; 671 offs = 0; 672 #if 0 673 if (bootverbose || bp->bio_offset / PAGE_SIZE < 17) 674 printf("wire_count %d busy %d flags %x hold_count %d act_count %d queue %d valid %d dirty %d @ %d\n", 675 m->wire_count, m->busy, 676 m->flags, m->hold_count, m->act_count, m->queue, m->valid, m->dirty, i); 677 #endif 678 } 679 vm_object_pip_subtract(sc->object, 1); 680 vm_object_set_writeable_dirty(sc->object); 681 VM_OBJECT_UNLOCK(sc->object); 682 return (rv != VM_PAGER_ERROR ? 0 : ENOSPC); 683 } 684 685 static void 686 md_kthread(void *arg) 687 { 688 struct md_s *sc; 689 struct bio *bp; 690 int error; 691 692 sc = arg; 693 thread_lock(curthread); 694 sched_prio(curthread, PRIBIO); 695 thread_unlock(curthread); 696 if (sc->type == MD_VNODE) 697 curthread->td_pflags |= TDP_NORUNNINGBUF; 698 699 for (;;) { 700 mtx_lock(&sc->queue_mtx); 701 if (sc->flags & MD_SHUTDOWN) { 702 sc->flags |= MD_EXITING; 703 mtx_unlock(&sc->queue_mtx); 704 kthread_exit(0); 705 } 706 bp = bioq_takefirst(&sc->bio_queue); 707 if (!bp) { 708 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 709 continue; 710 } 711 mtx_unlock(&sc->queue_mtx); 712 if (bp->bio_cmd == BIO_GETATTR) { 713 if (sc->fwsectors && sc->fwheads && 714 (g_handleattr_int(bp, "GEOM::fwsectors", 715 sc->fwsectors) || 716 g_handleattr_int(bp, "GEOM::fwheads", 717 sc->fwheads))) 718 error = -1; 719 else 720 error = EOPNOTSUPP; 721 } else { 722 error = sc->start(sc, bp); 723 } 724 725 if (error != -1) { 726 bp->bio_completed = bp->bio_length; 727 g_io_deliver(bp, error); 728 } 729 } 730 } 731 732 static struct md_s * 733 mdfind(int unit) 734 { 735 struct md_s *sc; 736 737 LIST_FOREACH(sc, &md_softc_list, list) { 738 if (sc->unit == unit) 739 break; 740 } 741 return (sc); 742 } 743 744 static struct md_s * 745 mdnew(int unit, int *errp, enum md_types type) 746 { 747 struct md_s *sc, *sc2; 748 int error, max = -1; 749 750 *errp = 0; 751 LIST_FOREACH(sc2, &md_softc_list, list) { 752 if (unit == sc2->unit) { 753 *errp = EBUSY; 754 return (NULL); 755 } 756 if (unit == -1 && sc2->unit > max) 757 max = sc2->unit; 758 } 759 if (unit == -1) 760 unit = max + 1; 761 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 762 sc->type = type; 763 bioq_init(&sc->bio_queue); 764 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 765 sc->unit = unit; 766 sprintf(sc->name, "md%d", unit); 767 LIST_INSERT_HEAD(&md_softc_list, sc, list); 768 error = kthread_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 769 if (error == 0) 770 return (sc); 771 LIST_REMOVE(sc, list); 772 mtx_destroy(&sc->queue_mtx); 773 free(sc, M_MD); 774 *errp = error; 775 return (NULL); 776 } 777 778 static void 779 mdinit(struct md_s *sc) 780 { 781 782 struct g_geom *gp; 783 struct g_provider *pp; 784 785 g_topology_lock(); 786 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 787 gp->softc = sc; 788 pp = g_new_providerf(gp, "md%d", sc->unit); 789 pp->mediasize = sc->mediasize; 790 pp->sectorsize = sc->sectorsize; 791 sc->gp = gp; 792 sc->pp = pp; 793 g_error_provider(pp, 0); 794 g_topology_unlock(); 795 } 796 797 /* 798 * XXX: we should check that the range they feed us is mapped. 799 * XXX: we should implement read-only. 800 */ 801 802 static int 803 mdcreate_preload(struct md_s *sc, struct md_ioctl *mdio) 804 { 805 806 if (mdio->md_options & ~(MD_AUTOUNIT | MD_FORCE)) 807 return (EINVAL); 808 sc->flags = mdio->md_options & MD_FORCE; 809 /* Cast to pointer size, then to pointer to avoid warning */ 810 sc->pl_ptr = (u_char *)(uintptr_t)mdio->md_base; 811 sc->pl_len = (size_t)sc->mediasize; 812 return (0); 813 } 814 815 816 static int 817 mdcreate_malloc(struct md_s *sc, struct md_ioctl *mdio) 818 { 819 uintptr_t sp; 820 int error; 821 off_t u; 822 823 error = 0; 824 if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 825 return (EINVAL); 826 if (mdio->md_sectorsize != 0 && !powerof2(mdio->md_sectorsize)) 827 return (EINVAL); 828 /* Compression doesn't make sense if we have reserved space */ 829 if (mdio->md_options & MD_RESERVE) 830 mdio->md_options &= ~MD_COMPRESS; 831 if (mdio->md_fwsectors != 0) 832 sc->fwsectors = mdio->md_fwsectors; 833 if (mdio->md_fwheads != 0) 834 sc->fwheads = mdio->md_fwheads; 835 sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE); 836 sc->indir = dimension(sc->mediasize / sc->sectorsize); 837 sc->uma = uma_zcreate(sc->name, sc->sectorsize, NULL, NULL, NULL, NULL, 838 0x1ff, 0); 839 if (mdio->md_options & MD_RESERVE) { 840 off_t nsectors; 841 842 nsectors = sc->mediasize / sc->sectorsize; 843 for (u = 0; u < nsectors; u++) { 844 sp = (uintptr_t)uma_zalloc(sc->uma, M_NOWAIT | M_ZERO); 845 if (sp != 0) 846 error = s_write(sc->indir, u, sp); 847 else 848 error = ENOMEM; 849 if (error != 0) 850 break; 851 } 852 } 853 return (error); 854 } 855 856 857 static int 858 mdsetcred(struct md_s *sc, struct ucred *cred) 859 { 860 char *tmpbuf; 861 int error = 0; 862 863 /* 864 * Set credits in our softc 865 */ 866 867 if (sc->cred) 868 crfree(sc->cred); 869 sc->cred = crhold(cred); 870 871 /* 872 * Horrible kludge to establish credentials for NFS XXX. 873 */ 874 875 if (sc->vnode) { 876 struct uio auio; 877 struct iovec aiov; 878 879 tmpbuf = malloc(sc->sectorsize, M_TEMP, M_WAITOK); 880 bzero(&auio, sizeof(auio)); 881 882 aiov.iov_base = tmpbuf; 883 aiov.iov_len = sc->sectorsize; 884 auio.uio_iov = &aiov; 885 auio.uio_iovcnt = 1; 886 auio.uio_offset = 0; 887 auio.uio_rw = UIO_READ; 888 auio.uio_segflg = UIO_SYSSPACE; 889 auio.uio_resid = aiov.iov_len; 890 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curthread); 891 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 892 VOP_UNLOCK(sc->vnode, 0, curthread); 893 free(tmpbuf, M_TEMP); 894 } 895 return (error); 896 } 897 898 static int 899 mdcreate_vnode(struct md_s *sc, struct md_ioctl *mdio, struct thread *td) 900 { 901 struct vattr vattr; 902 struct nameidata nd; 903 int error, flags, vfslocked; 904 905 error = copyinstr(mdio->md_file, sc->file, sizeof(sc->file), NULL); 906 if (error != 0) 907 return (error); 908 flags = FREAD|FWRITE; 909 /* 910 * If the user specified that this is a read only device, unset the 911 * FWRITE mask before trying to open the backing store. 912 */ 913 if ((mdio->md_options & MD_READONLY) != 0) 914 flags &= ~FWRITE; 915 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE, UIO_SYSSPACE, sc->file, td); 916 error = vn_open(&nd, &flags, 0, NULL); 917 if (error != 0) 918 return (error); 919 vfslocked = NDHASGIANT(&nd); 920 NDFREE(&nd, NDF_ONLY_PNBUF); 921 if (nd.ni_vp->v_type != VREG || 922 (error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred, td))) { 923 VOP_UNLOCK(nd.ni_vp, 0, td); 924 (void)vn_close(nd.ni_vp, flags, td->td_ucred, td); 925 VFS_UNLOCK_GIANT(vfslocked); 926 return (error ? error : EINVAL); 927 } 928 nd.ni_vp->v_vflag |= VV_MD; 929 VOP_UNLOCK(nd.ni_vp, 0, td); 930 931 if (mdio->md_fwsectors != 0) 932 sc->fwsectors = mdio->md_fwsectors; 933 if (mdio->md_fwheads != 0) 934 sc->fwheads = mdio->md_fwheads; 935 sc->flags = mdio->md_options & (MD_FORCE | MD_ASYNC); 936 if (!(flags & FWRITE)) 937 sc->flags |= MD_READONLY; 938 sc->vnode = nd.ni_vp; 939 940 error = mdsetcred(sc, td->td_ucred); 941 if (error != 0) { 942 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY, td); 943 nd.ni_vp->v_vflag &= ~VV_MD; 944 VOP_UNLOCK(nd.ni_vp, 0, td); 945 (void)vn_close(nd.ni_vp, flags, td->td_ucred, td); 946 VFS_UNLOCK_GIANT(vfslocked); 947 return (error); 948 } 949 VFS_UNLOCK_GIANT(vfslocked); 950 return (0); 951 } 952 953 static int 954 mddestroy(struct md_s *sc, struct thread *td) 955 { 956 int vfslocked; 957 958 if (sc->gp) { 959 sc->gp->softc = NULL; 960 g_topology_lock(); 961 g_wither_geom(sc->gp, ENXIO); 962 g_topology_unlock(); 963 sc->gp = NULL; 964 sc->pp = NULL; 965 } 966 mtx_lock(&sc->queue_mtx); 967 sc->flags |= MD_SHUTDOWN; 968 wakeup(sc); 969 while (!(sc->flags & MD_EXITING)) 970 msleep(sc->procp, &sc->queue_mtx, PRIBIO, "mddestroy", hz / 10); 971 mtx_unlock(&sc->queue_mtx); 972 mtx_destroy(&sc->queue_mtx); 973 if (sc->vnode != NULL) { 974 vfslocked = VFS_LOCK_GIANT(sc->vnode->v_mount); 975 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, td); 976 sc->vnode->v_vflag &= ~VV_MD; 977 VOP_UNLOCK(sc->vnode, 0, td); 978 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 979 FREAD : (FREAD|FWRITE), sc->cred, td); 980 VFS_UNLOCK_GIANT(vfslocked); 981 } 982 if (sc->cred != NULL) 983 crfree(sc->cred); 984 if (sc->object != NULL) 985 vm_object_deallocate(sc->object); 986 if (sc->indir) 987 destroy_indir(sc, sc->indir); 988 if (sc->uma) 989 uma_zdestroy(sc->uma); 990 991 LIST_REMOVE(sc, list); 992 free(sc, M_MD); 993 return (0); 994 } 995 996 static int 997 mdcreate_swap(struct md_s *sc, struct md_ioctl *mdio, struct thread *td) 998 { 999 vm_ooffset_t npage; 1000 int error; 1001 1002 /* 1003 * Range check. Disallow negative sizes or any size less then the 1004 * size of a page. Then round to a page. 1005 */ 1006 if (sc->mediasize == 0 || (sc->mediasize % PAGE_SIZE) != 0) 1007 return (EDOM); 1008 1009 /* 1010 * Allocate an OBJT_SWAP object. 1011 * 1012 * Note the truncation. 1013 */ 1014 1015 npage = mdio->md_mediasize / PAGE_SIZE; 1016 if (mdio->md_fwsectors != 0) 1017 sc->fwsectors = mdio->md_fwsectors; 1018 if (mdio->md_fwheads != 0) 1019 sc->fwheads = mdio->md_fwheads; 1020 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * npage, 1021 VM_PROT_DEFAULT, 0); 1022 if (sc->object == NULL) 1023 return (ENOMEM); 1024 sc->flags = mdio->md_options & MD_FORCE; 1025 if (mdio->md_options & MD_RESERVE) { 1026 if (swap_pager_reserve(sc->object, 0, npage) < 0) { 1027 vm_object_deallocate(sc->object); 1028 sc->object = NULL; 1029 return (EDOM); 1030 } 1031 } 1032 error = mdsetcred(sc, td->td_ucred); 1033 if (error != 0) { 1034 vm_object_deallocate(sc->object); 1035 sc->object = NULL; 1036 } 1037 return (error); 1038 } 1039 1040 1041 static int 1042 xmdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 1043 { 1044 struct md_ioctl *mdio; 1045 struct md_s *sc; 1046 int error, i; 1047 1048 if (md_debug) 1049 printf("mdctlioctl(%s %lx %p %x %p)\n", 1050 devtoname(dev), cmd, addr, flags, td); 1051 1052 mdio = (struct md_ioctl *)addr; 1053 if (mdio->md_version != MDIOVERSION) 1054 return (EINVAL); 1055 1056 /* 1057 * We assert the version number in the individual ioctl 1058 * handlers instead of out here because (a) it is possible we 1059 * may add another ioctl in the future which doesn't read an 1060 * mdio, and (b) the correct return value for an unknown ioctl 1061 * is ENOIOCTL, not EINVAL. 1062 */ 1063 error = 0; 1064 switch (cmd) { 1065 case MDIOCATTACH: 1066 switch (mdio->md_type) { 1067 case MD_MALLOC: 1068 case MD_PRELOAD: 1069 case MD_VNODE: 1070 case MD_SWAP: 1071 break; 1072 default: 1073 return (EINVAL); 1074 } 1075 if (mdio->md_options & MD_AUTOUNIT) 1076 sc = mdnew(-1, &error, mdio->md_type); 1077 else 1078 sc = mdnew(mdio->md_unit, &error, mdio->md_type); 1079 if (sc == NULL) 1080 return (error); 1081 if (mdio->md_options & MD_AUTOUNIT) 1082 mdio->md_unit = sc->unit; 1083 sc->mediasize = mdio->md_mediasize; 1084 if (mdio->md_sectorsize == 0) 1085 sc->sectorsize = DEV_BSIZE; 1086 else 1087 sc->sectorsize = mdio->md_sectorsize; 1088 error = EDOOFUS; 1089 switch (sc->type) { 1090 case MD_MALLOC: 1091 sc->start = mdstart_malloc; 1092 error = mdcreate_malloc(sc, mdio); 1093 break; 1094 case MD_PRELOAD: 1095 sc->start = mdstart_preload; 1096 error = mdcreate_preload(sc, mdio); 1097 break; 1098 case MD_VNODE: 1099 sc->start = mdstart_vnode; 1100 error = mdcreate_vnode(sc, mdio, td); 1101 break; 1102 case MD_SWAP: 1103 sc->start = mdstart_swap; 1104 error = mdcreate_swap(sc, mdio, td); 1105 break; 1106 } 1107 if (error != 0) { 1108 mddestroy(sc, td); 1109 return (error); 1110 } 1111 1112 /* Prune off any residual fractional sector */ 1113 i = sc->mediasize % sc->sectorsize; 1114 sc->mediasize -= i; 1115 1116 mdinit(sc); 1117 return (0); 1118 case MDIOCDETACH: 1119 if (mdio->md_mediasize != 0 || mdio->md_options != 0) 1120 return (EINVAL); 1121 1122 sc = mdfind(mdio->md_unit); 1123 if (sc == NULL) 1124 return (ENOENT); 1125 if (sc->opencount != 0 && !(sc->flags & MD_FORCE)) 1126 return (EBUSY); 1127 return (mddestroy(sc, td)); 1128 case MDIOCQUERY: 1129 sc = mdfind(mdio->md_unit); 1130 if (sc == NULL) 1131 return (ENOENT); 1132 mdio->md_type = sc->type; 1133 mdio->md_options = sc->flags; 1134 mdio->md_mediasize = sc->mediasize; 1135 mdio->md_sectorsize = sc->sectorsize; 1136 if (sc->type == MD_VNODE) 1137 error = copyout(sc->file, mdio->md_file, 1138 strlen(sc->file) + 1); 1139 return (error); 1140 case MDIOCLIST: 1141 i = 1; 1142 LIST_FOREACH(sc, &md_softc_list, list) { 1143 if (i == MDNPAD - 1) 1144 mdio->md_pad[i] = -1; 1145 else 1146 mdio->md_pad[i++] = sc->unit; 1147 } 1148 mdio->md_pad[0] = i - 1; 1149 return (0); 1150 default: 1151 return (ENOIOCTL); 1152 }; 1153 } 1154 1155 static int 1156 mdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 1157 { 1158 int error; 1159 1160 sx_xlock(&md_sx); 1161 error = xmdctlioctl(dev, cmd, addr, flags, td); 1162 sx_xunlock(&md_sx); 1163 return (error); 1164 } 1165 1166 static void 1167 md_preloaded(u_char *image, size_t length) 1168 { 1169 struct md_s *sc; 1170 int error; 1171 1172 sc = mdnew(-1, &error, MD_PRELOAD); 1173 if (sc == NULL) 1174 return; 1175 sc->mediasize = length; 1176 sc->sectorsize = DEV_BSIZE; 1177 sc->pl_ptr = image; 1178 sc->pl_len = length; 1179 sc->start = mdstart_preload; 1180 #ifdef MD_ROOT 1181 if (sc->unit == 0) 1182 rootdevnames[0] = "ufs:/dev/md0"; 1183 #endif 1184 mdinit(sc); 1185 } 1186 1187 static void 1188 g_md_init(struct g_class *mp __unused) 1189 { 1190 1191 caddr_t mod; 1192 caddr_t c; 1193 u_char *ptr, *name, *type; 1194 unsigned len; 1195 1196 mod = NULL; 1197 sx_init(&md_sx, "MD config lock"); 1198 g_topology_unlock(); 1199 #ifdef MD_ROOT_SIZE 1200 sx_xlock(&md_sx); 1201 md_preloaded(mfs_root.start, sizeof(mfs_root.start)); 1202 sx_xunlock(&md_sx); 1203 #endif 1204 /* XXX: are preload_* static or do they need Giant ? */ 1205 while ((mod = preload_search_next_name(mod)) != NULL) { 1206 name = (char *)preload_search_info(mod, MODINFO_NAME); 1207 if (name == NULL) 1208 continue; 1209 type = (char *)preload_search_info(mod, MODINFO_TYPE); 1210 if (type == NULL) 1211 continue; 1212 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 1213 continue; 1214 c = preload_search_info(mod, MODINFO_ADDR); 1215 ptr = *(u_char **)c; 1216 c = preload_search_info(mod, MODINFO_SIZE); 1217 len = *(size_t *)c; 1218 printf("%s%d: Preloaded image <%s> %d bytes at %p\n", 1219 MD_NAME, mdunits, name, len, ptr); 1220 sx_xlock(&md_sx); 1221 md_preloaded(ptr, len); 1222 sx_xunlock(&md_sx); 1223 } 1224 status_dev = make_dev(&mdctl_cdevsw, MAXMINOR, UID_ROOT, GID_WHEEL, 1225 0600, MDCTL_NAME); 1226 g_topology_lock(); 1227 } 1228 1229 static void 1230 g_md_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 1231 struct g_consumer *cp __unused, struct g_provider *pp) 1232 { 1233 struct md_s *mp; 1234 char *type; 1235 1236 mp = gp->softc; 1237 if (mp == NULL) 1238 return; 1239 1240 switch (mp->type) { 1241 case MD_MALLOC: 1242 type = "malloc"; 1243 break; 1244 case MD_PRELOAD: 1245 type = "preload"; 1246 break; 1247 case MD_VNODE: 1248 type = "vnode"; 1249 break; 1250 case MD_SWAP: 1251 type = "swap"; 1252 break; 1253 default: 1254 type = "unknown"; 1255 break; 1256 } 1257 1258 if (pp != NULL) { 1259 if (indent == NULL) { 1260 sbuf_printf(sb, " u %d", mp->unit); 1261 sbuf_printf(sb, " s %ju", (uintmax_t) mp->sectorsize); 1262 sbuf_printf(sb, " f %ju", (uintmax_t) mp->fwheads); 1263 sbuf_printf(sb, " fs %ju", (uintmax_t) mp->fwsectors); 1264 sbuf_printf(sb, " l %ju", (uintmax_t) mp->mediasize); 1265 sbuf_printf(sb, " t %s", type); 1266 if (mp->type == MD_VNODE && mp->vnode != NULL) 1267 sbuf_printf(sb, " file %s", mp->file); 1268 } else { 1269 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent, 1270 mp->unit); 1271 sbuf_printf(sb, "%s<sectorsize>%ju</sectorsize>\n", 1272 indent, (uintmax_t) mp->sectorsize); 1273 sbuf_printf(sb, "%s<fwheads>%ju</fwheads>\n", 1274 indent, (uintmax_t) mp->fwheads); 1275 sbuf_printf(sb, "%s<fwsectors>%ju</fwsectors>\n", 1276 indent, (uintmax_t) mp->fwsectors); 1277 sbuf_printf(sb, "%s<length>%ju</length>\n", 1278 indent, (uintmax_t) mp->mediasize); 1279 sbuf_printf(sb, "%s<type>%s</type>\n", indent, 1280 type); 1281 if (mp->type == MD_VNODE && mp->vnode != NULL) 1282 sbuf_printf(sb, "%s<file>%s</file>\n", 1283 indent, mp->file); 1284 } 1285 } 1286 } 1287 1288 static void 1289 g_md_fini(struct g_class *mp __unused) 1290 { 1291 1292 sx_destroy(&md_sx); 1293 if (status_dev != NULL) 1294 destroy_dev(status_dev); 1295 }
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