1 /* 2 * Copyright (c) 2003,2004,2009 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * ---------------------------------------------------------------------------- 35 * "THE BEER-WARE LICENSE" (Revision 42): 36 * <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you 37 * can do whatever you want with this stuff. If we meet some day, and you think 38 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 39 * ---------------------------------------------------------------------------- 40 * 41 * Copyright (c) 1982, 1986, 1988, 1993 42 * The Regents of the University of California. All rights reserved. 43 * (c) UNIX System Laboratories, Inc. 44 * All or some portions of this file are derived from material licensed 45 * to the University of California by American Telephone and Telegraph 46 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 47 * the permission of UNIX System Laboratories, Inc. 48 * 49 * Redistribution and use in source and binary forms, with or without 50 * modification, are permitted provided that the following conditions 51 * are met: 52 * 1. Redistributions of source code must retain the above copyright 53 * notice, this list of conditions and the following disclaimer. 54 * 2. Redistributions in binary form must reproduce the above copyright 55 * notice, this list of conditions and the following disclaimer in the 56 * documentation and/or other materials provided with the distribution. 57 * 3. All advertising materials mentioning features or use of this software 58 * must display the following acknowledgement: 59 * This product includes software developed by the University of 60 * California, Berkeley and its contributors. 61 * 4. Neither the name of the University nor the names of its contributors 62 * may be used to endorse or promote products derived from this software 63 * without specific prior written permission. 64 * 65 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 66 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 67 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 68 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 69 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 70 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 71 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 72 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 73 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 74 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 75 * SUCH DAMAGE. 76 * 77 * @(#)ufs_disksubr.c 8.5 (Berkeley) 1/21/94 78 * $FreeBSD: src/sys/kern/subr_disk.c,v 1.20.2.6 2001/10/05 07:14:57 peter Exp $ 79 * $FreeBSD: src/sys/ufs/ufs/ufs_disksubr.c,v 1.44.2.3 2001/03/05 05:42:19 obrien Exp $ 80 * $DragonFly: src/sys/kern/subr_disk.c,v 1.40 2008/06/05 18:06:32 swildner Exp $ 81 */ 82 83 #include <sys/param.h> 84 #include <sys/systm.h> 85 #include <sys/kernel.h> 86 #include <sys/proc.h> 87 #include <sys/sysctl.h> 88 #include <sys/buf.h> 89 #include <sys/conf.h> 90 #include <sys/disklabel.h> 91 #include <sys/disklabel32.h> 92 #include <sys/disklabel64.h> 93 #include <sys/diskslice.h> 94 #include <sys/diskmbr.h> 95 #include <sys/disk.h> 96 #include <sys/kerneldump.h> 97 #include <sys/malloc.h> 98 #include <sys/sysctl.h> 99 #include <machine/md_var.h> 100 #include <sys/ctype.h> 101 #include <sys/syslog.h> 102 #include <sys/device.h> 103 #include <sys/msgport.h> 104 #include <sys/msgport2.h> 105 #include <sys/buf2.h> 106 #include <sys/devfs.h> 107 #include <sys/thread.h> 108 #include <sys/thread2.h> 109 110 #include <sys/queue.h> 111 #include <sys/lock.h> 112 113 static MALLOC_DEFINE(M_DISK, "disk", "disk data"); 114 static int disk_debug_enable = 0; 115 116 static void disk_msg_autofree_reply(lwkt_port_t, lwkt_msg_t); 117 static void disk_msg_core(void *); 118 static int disk_probe_slice(struct disk *dp, cdev_t dev, int slice, int reprobe); 119 static void disk_probe(struct disk *dp, int reprobe); 120 static void _setdiskinfo(struct disk *disk, struct disk_info *info); 121 static void bioqwritereorder(struct bio_queue_head *bioq); 122 static void disk_cleanserial(char *serno); 123 124 static d_open_t diskopen; 125 static d_close_t diskclose; 126 static d_ioctl_t diskioctl; 127 static d_strategy_t diskstrategy; 128 static d_psize_t diskpsize; 129 static d_clone_t diskclone; 130 static d_dump_t diskdump; 131 132 static LIST_HEAD(, disk) disklist = LIST_HEAD_INITIALIZER(&disklist); 133 static struct lwkt_token disklist_token; 134 135 static struct dev_ops disk_ops = { 136 { "disk", 0, D_DISK }, 137 .d_open = diskopen, 138 .d_close = diskclose, 139 .d_read = physread, 140 .d_write = physwrite, 141 .d_ioctl = diskioctl, 142 .d_strategy = diskstrategy, 143 .d_dump = diskdump, 144 .d_psize = diskpsize, 145 .d_clone = diskclone 146 }; 147 148 static struct objcache *disk_msg_cache; 149 150 struct objcache_malloc_args disk_msg_malloc_args = { 151 sizeof(struct disk_msg), M_DISK }; 152 153 static struct lwkt_port disk_dispose_port; 154 static struct lwkt_port disk_msg_port; 155 156 static int 157 disk_debug(int level, char *fmt, ...) 158 { 159 __va_list ap; 160 161 __va_start(ap, fmt); 162 if (level <= disk_debug_enable) 163 kvprintf(fmt, ap); 164 __va_end(ap); 165 166 return 0; 167 } 168 169 static int 170 disk_probe_slice(struct disk *dp, cdev_t dev, int slice, int reprobe) 171 { 172 struct disk_info *info = &dp->d_info; 173 struct diskslice *sp = &dp->d_slice->dss_slices[slice]; 174 disklabel_ops_t ops; 175 struct partinfo part; 176 const char *msg; 177 cdev_t ndev; 178 int sno; 179 u_int i; 180 181 disk_debug(2, 182 "disk_probe_slice (begin): %s (%s)\n", 183 dev->si_name, dp->d_cdev->si_name); 184 185 sno = slice ? slice - 1 : 0; 186 187 ops = &disklabel32_ops; 188 msg = ops->op_readdisklabel(dev, sp, &sp->ds_label, info); 189 if (msg && !strcmp(msg, "no disk label")) { 190 ops = &disklabel64_ops; 191 msg = ops->op_readdisklabel(dev, sp, &sp->ds_label, info); 192 } 193 if (msg == NULL) { 194 if (slice != WHOLE_DISK_SLICE) 195 ops->op_adjust_label_reserved(dp->d_slice, slice, sp); 196 else 197 sp->ds_reserved = 0; 198 199 sp->ds_ops = ops; 200 for (i = 0; i < ops->op_getnumparts(sp->ds_label); i++) { 201 ops->op_loadpartinfo(sp->ds_label, i, &part); 202 if (part.fstype) { 203 if (reprobe && 204 (ndev = devfs_find_device_by_name("%s%c", 205 dev->si_name, 'a' + i)) 206 ) { 207 /* 208 * Device already exists and 209 * is still valid. 210 */ 211 ndev->si_flags |= SI_REPROBE_TEST; 212 } else { 213 ndev = make_dev_covering(&disk_ops, dp->d_rawdev->si_ops, 214 dkmakeminor(dkunit(dp->d_cdev), 215 slice, i), 216 UID_ROOT, GID_OPERATOR, 0640, 217 "%s%c", dev->si_name, 'a'+ i); 218 ndev->si_disk = dp; 219 if (dp->d_info.d_serialno) { 220 make_dev_alias(ndev, 221 "serno/%s.s%d%c", 222 dp->d_info.d_serialno, 223 sno, 'a' + i); 224 } 225 ndev->si_flags |= SI_REPROBE_TEST; 226 } 227 } 228 } 229 } else if (info->d_dsflags & DSO_COMPATLABEL) { 230 msg = NULL; 231 if (sp->ds_size >= 0x100000000ULL) 232 ops = &disklabel64_ops; 233 else 234 ops = &disklabel32_ops; 235 sp->ds_label = ops->op_clone_label(info, sp); 236 } else { 237 if (sp->ds_type == DOSPTYP_386BSD || /* XXX */ 238 sp->ds_type == DOSPTYP_NETBSD || 239 sp->ds_type == DOSPTYP_OPENBSD) { 240 log(LOG_WARNING, "%s: cannot find label (%s)\n", 241 dev->si_name, msg); 242 } 243 } 244 245 if (msg == NULL) { 246 sp->ds_wlabel = FALSE; 247 } 248 249 return (msg ? EINVAL : 0); 250 } 251 252 253 static void 254 disk_probe(struct disk *dp, int reprobe) 255 { 256 struct disk_info *info = &dp->d_info; 257 cdev_t dev = dp->d_cdev; 258 cdev_t ndev; 259 int error, i, sno; 260 struct diskslice *sp; 261 262 KKASSERT (info->d_media_blksize != 0); 263 264 dp->d_slice = dsmakeslicestruct(BASE_SLICE, info); 265 disk_debug(1, 266 "disk_probe (begin): %s\n", 267 dp->d_cdev->si_name); 268 269 error = mbrinit(dev, info, &(dp->d_slice)); 270 if (error) 271 return; 272 273 for (i = 0; i < dp->d_slice->dss_nslices; i++) { 274 /* 275 * Ignore the whole-disk slice, it has already been created. 276 */ 277 if (i == WHOLE_DISK_SLICE) 278 continue; 279 sp = &dp->d_slice->dss_slices[i]; 280 281 /* 282 * Handle s0. s0 is a compatibility slice if there are no 283 * other slices and it has not otherwise been set up, else 284 * we ignore it. 285 */ 286 if (i == COMPATIBILITY_SLICE) { 287 sno = 0; 288 if (sp->ds_type == 0 && 289 dp->d_slice->dss_nslices == BASE_SLICE) { 290 sp->ds_size = info->d_media_blocks; 291 sp->ds_reserved = 0; 292 } 293 } else { 294 sno = i - 1; 295 sp->ds_reserved = 0; 296 } 297 298 /* 299 * Ignore 0-length slices 300 */ 301 if (sp->ds_size == 0) 302 continue; 303 304 if (reprobe && 305 (ndev = devfs_find_device_by_name("%ss%d", 306 dev->si_name, sno))) { 307 /* 308 * Device already exists and is still valid 309 */ 310 ndev->si_flags |= SI_REPROBE_TEST; 311 } else { 312 /* 313 * Else create new device 314 */ 315 ndev = make_dev_covering(&disk_ops, dp->d_rawdev->si_ops, 316 dkmakewholeslice(dkunit(dev), i), 317 UID_ROOT, GID_OPERATOR, 0640, 318 "%ss%d", dev->si_name, sno); 319 if (dp->d_info.d_serialno) { 320 make_dev_alias(ndev, "serno/%s.s%d", 321 dp->d_info.d_serialno, sno); 322 } 323 ndev->si_disk = dp; 324 ndev->si_flags |= SI_REPROBE_TEST; 325 } 326 sp->ds_dev = ndev; 327 328 /* 329 * Probe appropriate slices for a disklabel 330 * 331 * XXX slice type 1 used by our gpt probe code. 332 * XXX slice type 0 used by mbr compat slice. 333 */ 334 if (sp->ds_type == DOSPTYP_386BSD || 335 sp->ds_type == DOSPTYP_NETBSD || 336 sp->ds_type == DOSPTYP_OPENBSD || 337 sp->ds_type == 0 || 338 sp->ds_type == 1) { 339 if (dp->d_slice->dss_first_bsd_slice == 0) 340 dp->d_slice->dss_first_bsd_slice = i; 341 disk_probe_slice(dp, ndev, i, reprobe); 342 } 343 } 344 disk_debug(1, 345 "disk_probe (end): %s\n", 346 dp->d_cdev->si_name); 347 } 348 349 350 static void 351 disk_msg_core(void *arg) 352 { 353 struct disk *dp; 354 struct diskslice *sp; 355 lwkt_tokref ilock; 356 disk_msg_t msg; 357 int run; 358 359 lwkt_initport_thread(&disk_msg_port, curthread); 360 wakeup(curthread); 361 run = 1; 362 363 while (run) { 364 msg = (disk_msg_t)lwkt_waitport(&disk_msg_port, 0); 365 366 switch (msg->hdr.u.ms_result) { 367 case DISK_DISK_PROBE: 368 dp = (struct disk *)msg->load; 369 disk_debug(1, 370 "DISK_DISK_PROBE: %s\n", 371 dp->d_cdev->si_name); 372 disk_probe(dp, 0); 373 break; 374 case DISK_DISK_DESTROY: 375 dp = (struct disk *)msg->load; 376 disk_debug(1, 377 "DISK_DISK_DESTROY: %s\n", 378 dp->d_cdev->si_name); 379 devfs_destroy_subnames(dp->d_cdev->si_name); 380 devfs_destroy_dev(dp->d_cdev); 381 lwkt_gettoken(&ilock, &disklist_token); 382 LIST_REMOVE(dp, d_list); 383 lwkt_reltoken(&ilock); 384 if (dp->d_info.d_serialno) { 385 kfree(dp->d_info.d_serialno, M_TEMP); 386 dp->d_info.d_serialno = NULL; 387 } 388 break; 389 case DISK_UNPROBE: 390 dp = (struct disk *)msg->load; 391 disk_debug(1, 392 "DISK_DISK_UNPROBE: %s\n", 393 dp->d_cdev->si_name); 394 devfs_destroy_subnames(dp->d_cdev->si_name); 395 break; 396 case DISK_SLICE_REPROBE: 397 dp = (struct disk *)msg->load; 398 sp = (struct diskslice *)msg->load2; 399 devfs_clr_subnames_flag(sp->ds_dev->si_name, 400 SI_REPROBE_TEST); 401 disk_debug(1, 402 "DISK_SLICE_REPROBE: %s\n", 403 sp->ds_dev->si_name); 404 disk_probe_slice(dp, sp->ds_dev, 405 dkslice(sp->ds_dev), 1); 406 devfs_destroy_subnames_without_flag( 407 sp->ds_dev->si_name, SI_REPROBE_TEST); 408 break; 409 case DISK_DISK_REPROBE: 410 dp = (struct disk *)msg->load; 411 devfs_clr_subnames_flag(dp->d_cdev->si_name, SI_REPROBE_TEST); 412 disk_debug(1, 413 "DISK_DISK_REPROBE: %s\n", 414 dp->d_cdev->si_name); 415 disk_probe(dp, 1); 416 devfs_destroy_subnames_without_flag( 417 dp->d_cdev->si_name, SI_REPROBE_TEST); 418 break; 419 case DISK_SYNC: 420 disk_debug(1, "DISK_SYNC\n"); 421 break; 422 default: 423 devfs_debug(DEVFS_DEBUG_WARNING, 424 "disk_msg_core: unknown message " 425 "received at core\n"); 426 break; 427 } 428 lwkt_replymsg((lwkt_msg_t)msg, 0); 429 } 430 lwkt_exit(); 431 } 432 433 434 /* 435 * Acts as a message drain. Any message that is replied to here gets 436 * destroyed and the memory freed. 437 */ 438 static void 439 disk_msg_autofree_reply(lwkt_port_t port, lwkt_msg_t msg) 440 { 441 objcache_put(disk_msg_cache, msg); 442 } 443 444 445 void 446 disk_msg_send(uint32_t cmd, void *load, void *load2) 447 { 448 disk_msg_t disk_msg; 449 lwkt_port_t port = &disk_msg_port; 450 451 disk_msg = objcache_get(disk_msg_cache, M_WAITOK); 452 453 lwkt_initmsg(&disk_msg->hdr, &disk_dispose_port, 0); 454 455 disk_msg->hdr.u.ms_result = cmd; 456 disk_msg->load = load; 457 disk_msg->load2 = load2; 458 KKASSERT(port); 459 lwkt_sendmsg(port, (lwkt_msg_t)disk_msg); 460 } 461 462 void 463 disk_msg_send_sync(uint32_t cmd, void *load, void *load2) 464 { 465 struct lwkt_port rep_port; 466 disk_msg_t disk_msg = objcache_get(disk_msg_cache, M_WAITOK); 467 disk_msg_t msg_incoming; 468 lwkt_port_t port = &disk_msg_port; 469 470 lwkt_initport_thread(&rep_port, curthread); 471 lwkt_initmsg(&disk_msg->hdr, &rep_port, 0); 472 473 disk_msg->hdr.u.ms_result = cmd; 474 disk_msg->load = load; 475 disk_msg->load2 = load2; 476 477 KKASSERT(port); 478 lwkt_sendmsg(port, (lwkt_msg_t)disk_msg); 479 msg_incoming = lwkt_waitport(&rep_port, 0); 480 } 481 482 /* 483 * Create a raw device for the dev_ops template (which is returned). Also 484 * create a slice and unit managed disk and overload the user visible 485 * device space with it. 486 * 487 * NOTE: The returned raw device is NOT a slice and unit managed device. 488 * It is an actual raw device representing the raw disk as specified by 489 * the passed dev_ops. The disk layer not only returns such a raw device, 490 * it also uses it internally when passing (modified) commands through. 491 */ 492 cdev_t 493 disk_create(int unit, struct disk *dp, struct dev_ops *raw_ops) 494 { 495 lwkt_tokref ilock; 496 cdev_t rawdev; 497 498 disk_debug(1, 499 "disk_create (begin): %s%d\n", 500 raw_ops->head.name, unit); 501 502 rawdev = make_only_dev(raw_ops, dkmakewholedisk(unit), 503 UID_ROOT, GID_OPERATOR, 0640, 504 "%s%d", raw_ops->head.name, unit); 505 506 bzero(dp, sizeof(*dp)); 507 508 dp->d_rawdev = rawdev; 509 dp->d_raw_ops = raw_ops; 510 dp->d_dev_ops = &disk_ops; 511 dp->d_cdev = make_dev_covering(&disk_ops, dp->d_rawdev->si_ops, 512 dkmakewholedisk(unit), 513 UID_ROOT, GID_OPERATOR, 0640, 514 "%s%d", raw_ops->head.name, unit); 515 516 dp->d_cdev->si_disk = dp; 517 518 lwkt_gettoken(&ilock, &disklist_token); 519 LIST_INSERT_HEAD(&disklist, dp, d_list); 520 lwkt_reltoken(&ilock); 521 522 disk_debug(1, 523 "disk_create (end): %s%d\n", 524 raw_ops->head.name, unit); 525 526 return (dp->d_rawdev); 527 } 528 529 530 static void 531 _setdiskinfo(struct disk *disk, struct disk_info *info) 532 { 533 char *oldserialno; 534 535 oldserialno = disk->d_info.d_serialno; 536 bcopy(info, &disk->d_info, sizeof(disk->d_info)); 537 info = &disk->d_info; 538 539 disk_debug(1, 540 "_setdiskinfo: %s\n", 541 disk->d_cdev->si_name); 542 543 /* 544 * The serial number is duplicated so the caller can throw 545 * their copy away. 546 */ 547 if (info->d_serialno && info->d_serialno[0]) { 548 info->d_serialno = kstrdup(info->d_serialno, M_TEMP); 549 disk_cleanserial(info->d_serialno); 550 if (disk->d_cdev) { 551 make_dev_alias(disk->d_cdev, "serno/%s", 552 info->d_serialno); 553 } 554 } else { 555 info->d_serialno = NULL; 556 } 557 if (oldserialno) 558 kfree(oldserialno, M_TEMP); 559 560 /* 561 * The caller may set d_media_size or d_media_blocks and we 562 * calculate the other. 563 */ 564 KKASSERT(info->d_media_size == 0 || info->d_media_blksize == 0); 565 if (info->d_media_size == 0 && info->d_media_blocks) { 566 info->d_media_size = (u_int64_t)info->d_media_blocks * 567 info->d_media_blksize; 568 } else if (info->d_media_size && info->d_media_blocks == 0 && 569 info->d_media_blksize) { 570 info->d_media_blocks = info->d_media_size / 571 info->d_media_blksize; 572 } 573 574 /* 575 * The si_* fields for rawdev are not set until after the 576 * disk_create() call, so someone using the cooked version 577 * of the raw device (i.e. da0s0) will not get the right 578 * si_iosize_max unless we fix it up here. 579 */ 580 if (disk->d_cdev && disk->d_rawdev && 581 disk->d_cdev->si_iosize_max == 0) { 582 disk->d_cdev->si_iosize_max = disk->d_rawdev->si_iosize_max; 583 disk->d_cdev->si_bsize_phys = disk->d_rawdev->si_bsize_phys; 584 disk->d_cdev->si_bsize_best = disk->d_rawdev->si_bsize_best; 585 } 586 } 587 588 /* 589 * Disk drivers must call this routine when media parameters are available 590 * or have changed. 591 */ 592 void 593 disk_setdiskinfo(struct disk *disk, struct disk_info *info) 594 { 595 _setdiskinfo(disk, info); 596 disk_msg_send(DISK_DISK_PROBE, disk, NULL); 597 disk_debug(1, 598 "disk_setdiskinfo: sent probe for %s\n", 599 disk->d_cdev->si_name); 600 } 601 602 void 603 disk_setdiskinfo_sync(struct disk *disk, struct disk_info *info) 604 { 605 _setdiskinfo(disk, info); 606 disk_msg_send_sync(DISK_DISK_PROBE, disk, NULL); 607 disk_debug(1, 608 "disk_setdiskinfo_sync: sent probe for %s\n", 609 disk->d_cdev->si_name); 610 } 611 612 /* 613 * This routine is called when an adapter detaches. The higher level 614 * managed disk device is destroyed while the lower level raw device is 615 * released. 616 */ 617 void 618 disk_destroy(struct disk *disk) 619 { 620 disk_msg_send_sync(DISK_DISK_DESTROY, disk, NULL); 621 return; 622 } 623 624 int 625 disk_dumpcheck(cdev_t dev, u_int64_t *size, u_int64_t *blkno, u_int32_t *secsize) 626 { 627 struct partinfo pinfo; 628 int error; 629 630 bzero(&pinfo, sizeof(pinfo)); 631 error = dev_dioctl(dev, DIOCGPART, (void *)&pinfo, 0, 632 proc0.p_ucred, NULL); 633 if (error) 634 return (error); 635 636 if (pinfo.media_blksize == 0) 637 return (ENXIO); 638 639 if (blkno) /* XXX: make sure this reserved stuff is right */ 640 *blkno = pinfo.reserved_blocks + 641 pinfo.media_offset / pinfo.media_blksize; 642 if (secsize) 643 *secsize = pinfo.media_blksize; 644 if (size) 645 *size = (pinfo.media_blocks - pinfo.reserved_blocks); 646 647 return (0); 648 } 649 650 int 651 disk_dumpconf(cdev_t dev, u_int onoff) 652 { 653 struct dumperinfo di; 654 u_int64_t size, blkno; 655 u_int32_t secsize; 656 int error; 657 658 if (!onoff) 659 return set_dumper(NULL); 660 661 error = disk_dumpcheck(dev, &size, &blkno, &secsize); 662 663 if (error) 664 return ENXIO; 665 666 bzero(&di, sizeof(struct dumperinfo)); 667 di.dumper = diskdump; 668 di.priv = dev; 669 di.blocksize = secsize; 670 di.mediaoffset = blkno * DEV_BSIZE; 671 di.mediasize = size * DEV_BSIZE; 672 673 return set_dumper(&di); 674 } 675 676 void 677 disk_unprobe(struct disk *disk) 678 { 679 if (disk == NULL) 680 return; 681 682 disk_msg_send_sync(DISK_UNPROBE, disk, NULL); 683 } 684 685 void 686 disk_invalidate (struct disk *disk) 687 { 688 if (disk->d_slice) 689 dsgone(&disk->d_slice); 690 } 691 692 struct disk * 693 disk_enumerate(struct disk *disk) 694 { 695 struct disk *dp; 696 lwkt_tokref ilock; 697 698 lwkt_gettoken(&ilock, &disklist_token); 699 if (!disk) 700 dp = (LIST_FIRST(&disklist)); 701 else 702 dp = (LIST_NEXT(disk, d_list)); 703 lwkt_reltoken(&ilock); 704 705 return dp; 706 } 707 708 static 709 int 710 sysctl_disks(SYSCTL_HANDLER_ARGS) 711 { 712 struct disk *disk; 713 int error, first; 714 715 disk = NULL; 716 first = 1; 717 718 while ((disk = disk_enumerate(disk))) { 719 if (!first) { 720 error = SYSCTL_OUT(req, " ", 1); 721 if (error) 722 return error; 723 } else { 724 first = 0; 725 } 726 error = SYSCTL_OUT(req, disk->d_rawdev->si_name, 727 strlen(disk->d_rawdev->si_name)); 728 if (error) 729 return error; 730 } 731 error = SYSCTL_OUT(req, "", 1); 732 return error; 733 } 734 735 SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD, NULL, 0, 736 sysctl_disks, "A", "names of available disks"); 737 738 /* 739 * Open a disk device or partition. 740 */ 741 static 742 int 743 diskopen(struct dev_open_args *ap) 744 { 745 cdev_t dev = ap->a_head.a_dev; 746 struct disk *dp; 747 int error; 748 749 /* 750 * dp can't be NULL here XXX. 751 * 752 * d_slice will be NULL if setdiskinfo() has not been called yet. 753 * setdiskinfo() is typically called whether the disk is present 754 * or not (e.g. CD), but the base disk device is created first 755 * and there may be a race. 756 */ 757 dp = dev->si_disk; 758 if (dp == NULL || dp->d_slice == NULL) 759 return (ENXIO); 760 error = 0; 761 762 /* 763 * Deal with open races 764 */ 765 while (dp->d_flags & DISKFLAG_LOCK) { 766 dp->d_flags |= DISKFLAG_WANTED; 767 error = tsleep(dp, PCATCH, "diskopen", hz); 768 if (error) 769 return (error); 770 } 771 dp->d_flags |= DISKFLAG_LOCK; 772 773 /* 774 * Open the underlying raw device. 775 */ 776 if (!dsisopen(dp->d_slice)) { 777 #if 0 778 if (!pdev->si_iosize_max) 779 pdev->si_iosize_max = dev->si_iosize_max; 780 #endif 781 error = dev_dopen(dp->d_rawdev, ap->a_oflags, 782 ap->a_devtype, ap->a_cred); 783 } 784 #if 0 785 /* 786 * Inherit properties from the underlying device now that it is 787 * open. 788 */ 789 dev_dclone(dev); 790 #endif 791 792 if (error) 793 goto out; 794 error = dsopen(dev, ap->a_devtype, dp->d_info.d_dsflags, 795 &dp->d_slice, &dp->d_info); 796 if (!dsisopen(dp->d_slice)) { 797 dev_dclose(dp->d_rawdev, ap->a_oflags, ap->a_devtype); 798 } 799 out: 800 dp->d_flags &= ~DISKFLAG_LOCK; 801 if (dp->d_flags & DISKFLAG_WANTED) { 802 dp->d_flags &= ~DISKFLAG_WANTED; 803 wakeup(dp); 804 } 805 806 return(error); 807 } 808 809 /* 810 * Close a disk device or partition 811 */ 812 static 813 int 814 diskclose(struct dev_close_args *ap) 815 { 816 cdev_t dev = ap->a_head.a_dev; 817 struct disk *dp; 818 int error; 819 820 error = 0; 821 dp = dev->si_disk; 822 823 dsclose(dev, ap->a_devtype, dp->d_slice); 824 if (!dsisopen(dp->d_slice)) { 825 error = dev_dclose(dp->d_rawdev, ap->a_fflag, ap->a_devtype); 826 } 827 return (error); 828 } 829 830 /* 831 * First execute the ioctl on the disk device, and if it isn't supported 832 * try running it on the backing device. 833 */ 834 static 835 int 836 diskioctl(struct dev_ioctl_args *ap) 837 { 838 cdev_t dev = ap->a_head.a_dev; 839 struct disk *dp; 840 int error; 841 u_int u; 842 843 dp = dev->si_disk; 844 if (dp == NULL) 845 return (ENXIO); 846 847 devfs_debug(DEVFS_DEBUG_DEBUG, 848 "diskioctl: cmd is: %x (name: %s)\n", 849 ap->a_cmd, dev->si_name); 850 devfs_debug(DEVFS_DEBUG_DEBUG, 851 "diskioctl: &dp->d_slice is: %x, %x\n", 852 &dp->d_slice, dp->d_slice); 853 854 if (ap->a_cmd == DIOCGKERNELDUMP) { 855 u = *(u_int *)ap->a_data; 856 return disk_dumpconf(dev, u); 857 } 858 859 error = dsioctl(dev, ap->a_cmd, ap->a_data, ap->a_fflag, 860 &dp->d_slice, &dp->d_info); 861 862 if (error == ENOIOCTL) { 863 error = dev_dioctl(dp->d_rawdev, ap->a_cmd, ap->a_data, 864 ap->a_fflag, ap->a_cred, NULL); 865 } 866 return (error); 867 } 868 869 /* 870 * Execute strategy routine 871 */ 872 static 873 int 874 diskstrategy(struct dev_strategy_args *ap) 875 { 876 cdev_t dev = ap->a_head.a_dev; 877 struct bio *bio = ap->a_bio; 878 struct bio *nbio; 879 struct disk *dp; 880 881 dp = dev->si_disk; 882 883 if (dp == NULL) { 884 bio->bio_buf->b_error = ENXIO; 885 bio->bio_buf->b_flags |= B_ERROR; 886 biodone(bio); 887 return(0); 888 } 889 KKASSERT(dev->si_disk == dp); 890 891 /* 892 * The dscheck() function will also transform the slice relative 893 * block number i.e. bio->bio_offset into a block number that can be 894 * passed directly to the underlying raw device. If dscheck() 895 * returns NULL it will have handled the bio for us (e.g. EOF 896 * or error due to being beyond the device size). 897 */ 898 if ((nbio = dscheck(dev, bio, dp->d_slice)) != NULL) { 899 dev_dstrategy(dp->d_rawdev, nbio); 900 } else { 901 biodone(bio); 902 } 903 return(0); 904 } 905 906 /* 907 * Return the partition size in ?blocks? 908 */ 909 static 910 int 911 diskpsize(struct dev_psize_args *ap) 912 { 913 cdev_t dev = ap->a_head.a_dev; 914 struct disk *dp; 915 916 dp = dev->si_disk; 917 if (dp == NULL) 918 return(ENODEV); 919 ap->a_result = dssize(dev, &dp->d_slice); 920 return(0); 921 } 922 923 /* 924 * When new device entries are instantiated, make sure they inherit our 925 * si_disk structure and block and iosize limits from the raw device. 926 * 927 * This routine is always called synchronously in the context of the 928 * client. 929 * 930 * XXX The various io and block size constraints are not always initialized 931 * properly by devices. 932 */ 933 static 934 int 935 diskclone(struct dev_clone_args *ap) 936 { 937 cdev_t dev = ap->a_head.a_dev; 938 struct disk *dp; 939 dp = dev->si_disk; 940 941 KKASSERT(dp != NULL); 942 dev->si_disk = dp; 943 dev->si_iosize_max = dp->d_rawdev->si_iosize_max; 944 dev->si_bsize_phys = dp->d_rawdev->si_bsize_phys; 945 dev->si_bsize_best = dp->d_rawdev->si_bsize_best; 946 return(0); 947 } 948 949 int 950 diskdump(struct dev_dump_args *ap) 951 { 952 cdev_t dev = ap->a_head.a_dev; 953 struct disk *dp = dev->si_disk; 954 u_int64_t size, offset; 955 int error; 956 957 error = disk_dumpcheck(dev, &size, &ap->a_blkno, &ap->a_secsize); 958 /* XXX: this should probably go in disk_dumpcheck somehow */ 959 if (ap->a_length != 0) { 960 size *= DEV_BSIZE; 961 offset = ap->a_blkno * DEV_BSIZE; 962 if ((ap->a_offset < offset) || 963 (ap->a_offset + ap->a_length - offset > size)) { 964 kprintf("Attempt to write outside dump device boundaries.\n"); 965 error = ENOSPC; 966 } 967 } 968 969 if (error == 0) { 970 ap->a_head.a_dev = dp->d_rawdev; 971 error = dev_doperate(&ap->a_head); 972 } 973 974 return(error); 975 } 976 977 978 SYSCTL_INT(_debug_sizeof, OID_AUTO, diskslices, CTLFLAG_RD, 979 0, sizeof(struct diskslices), "sizeof(struct diskslices)"); 980 981 SYSCTL_INT(_debug_sizeof, OID_AUTO, disk, CTLFLAG_RD, 982 0, sizeof(struct disk), "sizeof(struct disk)"); 983 984 /* 985 * Reorder interval for burst write allowance and minor write 986 * allowance. 987 * 988 * We always want to trickle some writes in to make use of the 989 * disk's zone cache. Bursting occurs on a longer interval and only 990 * runningbufspace is well over the hirunningspace limit. 991 */ 992 int bioq_reorder_burst_interval = 60; /* should be multiple of minor */ 993 SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_burst_interval, 994 CTLFLAG_RW, &bioq_reorder_burst_interval, 0, ""); 995 int bioq_reorder_minor_interval = 5; 996 SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_minor_interval, 997 CTLFLAG_RW, &bioq_reorder_minor_interval, 0, ""); 998 999 int bioq_reorder_burst_bytes = 3000000; 1000 SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_burst_bytes, 1001 CTLFLAG_RW, &bioq_reorder_burst_bytes, 0, ""); 1002 int bioq_reorder_minor_bytes = 262144; 1003 SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_minor_bytes, 1004 CTLFLAG_RW, &bioq_reorder_minor_bytes, 0, ""); 1005 1006 1007 /* 1008 * Order I/Os. Generally speaking this code is designed to make better 1009 * use of drive zone caches. A drive zone cache can typically track linear 1010 * reads or writes for around 16 zones simultaniously. 1011 * 1012 * Read prioritization issues: It is possible for hundreds of megabytes worth 1013 * of writes to be queued asynchronously. This creates a huge bottleneck 1014 * for reads which reduce read bandwidth to a trickle. 1015 * 1016 * To solve this problem we generally reorder reads before writes. 1017 * 1018 * However, a large number of random reads can also starve writes and 1019 * make poor use of the drive zone cache so we allow writes to trickle 1020 * in every N reads. 1021 */ 1022 void 1023 bioqdisksort(struct bio_queue_head *bioq, struct bio *bio) 1024 { 1025 /* 1026 * The BIO wants to be ordered. Adding to the tail also 1027 * causes transition to be set to NULL, forcing the ordering 1028 * of all prior I/O's. 1029 */ 1030 if (bio->bio_buf->b_flags & B_ORDERED) { 1031 bioq_insert_tail(bioq, bio); 1032 return; 1033 } 1034 1035 switch(bio->bio_buf->b_cmd) { 1036 case BUF_CMD_READ: 1037 if (bioq->transition) { 1038 /* 1039 * Insert before the first write. Bleedover writes 1040 * based on reorder intervals to prevent starvation. 1041 */ 1042 TAILQ_INSERT_BEFORE(bioq->transition, bio, bio_act); 1043 ++bioq->reorder; 1044 if (bioq->reorder % bioq_reorder_minor_interval == 0) { 1045 bioqwritereorder(bioq); 1046 if (bioq->reorder >= 1047 bioq_reorder_burst_interval) { 1048 bioq->reorder = 0; 1049 } 1050 } 1051 } else { 1052 /* 1053 * No writes queued (or ordering was forced), 1054 * insert at tail. 1055 */ 1056 TAILQ_INSERT_TAIL(&bioq->queue, bio, bio_act); 1057 } 1058 break; 1059 case BUF_CMD_WRITE: 1060 /* 1061 * Writes are always appended. If no writes were previously 1062 * queued or an ordered tail insertion occured the transition 1063 * field will be NULL. 1064 */ 1065 TAILQ_INSERT_TAIL(&bioq->queue, bio, bio_act); 1066 if (bioq->transition == NULL) 1067 bioq->transition = bio; 1068 break; 1069 default: 1070 /* 1071 * All other request types are forced to be ordered. 1072 */ 1073 bioq_insert_tail(bioq, bio); 1074 break; 1075 } 1076 } 1077 1078 /* 1079 * Move the read-write transition point to prevent reads from 1080 * completely starving our writes. This brings a number of writes into 1081 * the fold every N reads. 1082 * 1083 * We bring a few linear writes into the fold on a minor interval 1084 * and we bring a non-linear burst of writes into the fold on a major 1085 * interval. Bursting only occurs if runningbufspace is really high 1086 * (typically from syncs, fsyncs, or HAMMER flushes). 1087 */ 1088 static 1089 void 1090 bioqwritereorder(struct bio_queue_head *bioq) 1091 { 1092 struct bio *bio; 1093 off_t next_offset; 1094 size_t left; 1095 size_t n; 1096 int check_off; 1097 1098 if (bioq->reorder < bioq_reorder_burst_interval || 1099 !buf_runningbufspace_severe()) { 1100 left = (size_t)bioq_reorder_minor_bytes; 1101 check_off = 1; 1102 } else { 1103 left = (size_t)bioq_reorder_burst_bytes; 1104 check_off = 0; 1105 } 1106 1107 next_offset = bioq->transition->bio_offset; 1108 while ((bio = bioq->transition) != NULL && 1109 (check_off == 0 || next_offset == bio->bio_offset) 1110 ) { 1111 n = bio->bio_buf->b_bcount; 1112 next_offset = bio->bio_offset + n; 1113 bioq->transition = TAILQ_NEXT(bio, bio_act); 1114 if (left < n) 1115 break; 1116 left -= n; 1117 } 1118 } 1119 1120 /* 1121 * Disk error is the preface to plaintive error messages 1122 * about failing disk transfers. It prints messages of the form 1123 1124 hp0g: hard error reading fsbn 12345 of 12344-12347 (hp0 bn %d cn %d tn %d sn %d) 1125 1126 * if the offset of the error in the transfer and a disk label 1127 * are both available. blkdone should be -1 if the position of the error 1128 * is unknown; the disklabel pointer may be null from drivers that have not 1129 * been converted to use them. The message is printed with kprintf 1130 * if pri is LOG_PRINTF, otherwise it uses log at the specified priority. 1131 * The message should be completed (with at least a newline) with kprintf 1132 * or log(-1, ...), respectively. There is no trailing space. 1133 */ 1134 void 1135 diskerr(struct bio *bio, cdev_t dev, const char *what, int pri, int donecnt) 1136 { 1137 struct buf *bp = bio->bio_buf; 1138 const char *term; 1139 1140 switch(bp->b_cmd) { 1141 case BUF_CMD_READ: 1142 term = "read"; 1143 break; 1144 case BUF_CMD_WRITE: 1145 term = "write"; 1146 break; 1147 default: 1148 term = "access"; 1149 break; 1150 } 1151 kprintf("%s: %s %sing ", dev->si_name, what, term); 1152 kprintf("offset %012llx for %d", 1153 (long long)bio->bio_offset, 1154 bp->b_bcount); 1155 1156 if (donecnt) 1157 kprintf(" (%d bytes completed)", donecnt); 1158 } 1159 1160 /* 1161 * Locate a disk device 1162 */ 1163 cdev_t 1164 disk_locate(const char *devname) 1165 { 1166 return devfs_find_device_by_name(devname); 1167 } 1168 1169 void 1170 disk_config(void *arg) 1171 { 1172 disk_msg_send_sync(DISK_SYNC, NULL, NULL); 1173 } 1174 1175 static void 1176 disk_init(void) 1177 { 1178 struct thread* td_core; 1179 1180 disk_msg_cache = objcache_create("disk-msg-cache", 0, 0, 1181 NULL, NULL, NULL, 1182 objcache_malloc_alloc, 1183 objcache_malloc_free, 1184 &disk_msg_malloc_args); 1185 1186 lwkt_token_init(&disklist_token); 1187 1188 /* 1189 * Initialize the reply-only port which acts as a message drain 1190 */ 1191 lwkt_initport_replyonly(&disk_dispose_port, disk_msg_autofree_reply); 1192 1193 lwkt_create(disk_msg_core, /*args*/NULL, &td_core, NULL, 1194 0, 0, "disk_msg_core"); 1195 1196 tsleep(td_core, 0, "diskcore", 0); 1197 } 1198 1199 static void 1200 disk_uninit(void) 1201 { 1202 objcache_destroy(disk_msg_cache); 1203 } 1204 1205 /* 1206 * Clean out illegal characters in serial numbers. 1207 */ 1208 static void 1209 disk_cleanserial(char *serno) 1210 { 1211 char c; 1212 1213 while ((c = *serno) != 0) { 1214 if (c >= 'a' && c <= 'z') 1215 ; 1216 else if (c >= 'A' && c <= 'Z') 1217 ; 1218 else if (c >= '0' && c <= '9') 1219 ; 1220 else if (c == '-' || c == '@' || c == '+' || c == '.') 1221 ; 1222 else 1223 c = '_'; 1224 *serno++= c; 1225 } 1226 } 1227 1228 TUNABLE_INT("kern.disk_debug", &disk_debug_enable); 1229 SYSCTL_INT(_kern, OID_AUTO, disk_debug, CTLFLAG_RW, &disk_debug_enable, 1230 0, "Enable subr_disk debugging"); 1231 1232 SYSINIT(disk_register, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST, disk_init, NULL); 1233 SYSUNINIT(disk_register, SI_SUB_PRE_DRIVERS, SI_ORDER_ANY, disk_uninit, NULL); 1234