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 * and Alex Hornung <ahornung@gmail.com> 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the 17 * distribution. 18 * 3. Neither the name of The DragonFly Project nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific, prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * ---------------------------------------------------------------------------- 36 * "THE BEER-WARE LICENSE" (Revision 42): 37 * <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you 38 * can do whatever you want with this stuff. If we meet some day, and you think 39 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 40 * ---------------------------------------------------------------------------- 41 * 42 * Copyright (c) 1982, 1986, 1988, 1993 43 * The Regents of the University of California. All rights reserved. 44 * (c) UNIX System Laboratories, Inc. 45 * All or some portions of this file are derived from material licensed 46 * to the University of California by American Telephone and Telegraph 47 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 48 * the permission of UNIX System Laboratories, Inc. 49 * 50 * Redistribution and use in source and binary forms, with or without 51 * modification, are permitted provided that the following conditions 52 * are met: 53 * 1. Redistributions of source code must retain the above copyright 54 * notice, this list of conditions and the following disclaimer. 55 * 2. Redistributions in binary form must reproduce the above copyright 56 * notice, this list of conditions and the following disclaimer in the 57 * documentation and/or other materials provided with the distribution. 58 * 3. Neither the name of the University nor the names of its contributors 59 * may be used to endorse or promote products derived from this software 60 * without specific prior written permission. 61 * 62 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 63 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 64 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 65 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 66 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 67 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 68 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 69 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 70 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 71 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 72 * SUCH DAMAGE. 73 * 74 * @(#)ufs_disksubr.c 8.5 (Berkeley) 1/21/94 75 * $FreeBSD: src/sys/kern/subr_disk.c,v 1.20.2.6 2001/10/05 07:14:57 peter Exp $ 76 * $FreeBSD: src/sys/ufs/ufs/ufs_disksubr.c,v 1.44.2.3 2001/03/05 05:42:19 obrien Exp $ 77 */ 78 79 #include <sys/param.h> 80 #include <sys/systm.h> 81 #include <sys/kernel.h> 82 #include <sys/proc.h> 83 #include <sys/sysctl.h> 84 #include <sys/buf.h> 85 #include <sys/conf.h> 86 #include <sys/disklabel.h> 87 #include <sys/disklabel32.h> 88 #include <sys/disklabel64.h> 89 #include <sys/diskslice.h> 90 #include <sys/diskmbr.h> 91 #include <sys/disk.h> 92 #include <sys/kerneldump.h> 93 #include <sys/malloc.h> 94 #include <machine/md_var.h> 95 #include <sys/ctype.h> 96 #include <sys/syslog.h> 97 #include <sys/device.h> 98 #include <sys/msgport.h> 99 #include <sys/devfs.h> 100 #include <sys/thread.h> 101 #include <sys/dsched.h> 102 #include <sys/queue.h> 103 #include <sys/lock.h> 104 #include <sys/udev.h> 105 #include <sys/uuid.h> 106 107 #include <sys/buf2.h> 108 #include <sys/mplock2.h> 109 #include <sys/msgport2.h> 110 #include <sys/thread2.h> 111 112 static MALLOC_DEFINE(M_DISK, "disk", "disk data"); 113 static int disk_debug_enable = 0; 114 115 static void disk_msg_autofree_reply(lwkt_port_t, lwkt_msg_t); 116 static void disk_msg_core(void *); 117 static int disk_probe_slice(struct disk *dp, cdev_t dev, int slice, int reprobe); 118 static void disk_probe(struct disk *dp, int reprobe); 119 static void _setdiskinfo(struct disk *disk, struct disk_info *info); 120 static void bioqwritereorder(struct bio_queue_head *bioq); 121 static void disk_cleanserial(char *serno); 122 static int disk_debug(int, char *, ...) __printflike(2, 3); 123 static cdev_t _disk_create_named(const char *name, int unit, struct disk *dp, 124 struct dev_ops *raw_ops, int clone); 125 126 static d_open_t diskopen; 127 static d_close_t diskclose; 128 static d_ioctl_t diskioctl; 129 static d_strategy_t diskstrategy; 130 static d_psize_t diskpsize; 131 static d_dump_t diskdump; 132 133 static LIST_HEAD(, disk) disklist = LIST_HEAD_INITIALIZER(&disklist); 134 static struct lwkt_token disklist_token; 135 136 static struct dev_ops disk_ops = { 137 { "disk", 0, D_DISK | D_MPSAFE | D_TRACKCLOSE }, 138 .d_open = diskopen, 139 .d_close = diskclose, 140 .d_read = physread, 141 .d_write = physwrite, 142 .d_ioctl = diskioctl, 143 .d_strategy = diskstrategy, 144 .d_dump = diskdump, 145 .d_psize = diskpsize, 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 char uuid_buf[128]; 178 cdev_t ndev; 179 int sno; 180 u_int i; 181 182 disk_debug(2, "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 } 193 194 if (msg == NULL) { 195 if (slice != WHOLE_DISK_SLICE) 196 ops->op_adjust_label_reserved(dp->d_slice, slice, sp); 197 else 198 sp->ds_reserved = 0; 199 200 sp->ds_ops = ops; 201 for (i = 0; i < ops->op_getnumparts(sp->ds_label); i++) { 202 ops->op_loadpartinfo(sp->ds_label, i, &part); 203 if (part.fstype) { 204 if (reprobe && 205 (ndev = devfs_find_device_by_name("%s%c", 206 dev->si_name, 'a' + i)) 207 ) { 208 /* 209 * Device already exists and 210 * is still valid. 211 */ 212 ndev->si_flags |= SI_REPROBE_TEST; 213 214 /* 215 * Destroy old UUID alias 216 */ 217 destroy_dev_alias(ndev, "part-by-uuid/*"); 218 219 /* Create UUID alias */ 220 if (!kuuid_is_nil(&part.storage_uuid)) { 221 snprintf_uuid(uuid_buf, 222 sizeof(uuid_buf), 223 &part.storage_uuid); 224 make_dev_alias(ndev, 225 "part-by-uuid/%s", 226 uuid_buf); 227 udev_dict_set_cstr(ndev, "uuid", uuid_buf); 228 } 229 } else { 230 ndev = make_dev_covering(&disk_ops, dp->d_rawdev->si_ops, 231 dkmakeminor(dkunit(dp->d_cdev), 232 slice, i), 233 UID_ROOT, GID_OPERATOR, 0640, 234 "%s%c", dev->si_name, 'a'+ i); 235 ndev->si_parent = dev; 236 ndev->si_iosize_max = dev->si_iosize_max; 237 ndev->si_disk = dp; 238 udev_dict_set_cstr(ndev, "subsystem", "disk"); 239 /* Inherit parent's disk type */ 240 if (dp->d_disktype) { 241 udev_dict_set_cstr(ndev, "disk-type", 242 __DECONST(char *, dp->d_disktype)); 243 } 244 245 /* Create serno alias */ 246 if (dp->d_info.d_serialno) { 247 make_dev_alias(ndev, 248 "serno/%s.s%d%c", 249 dp->d_info.d_serialno, 250 sno, 'a' + i); 251 } 252 253 /* Create UUID alias */ 254 if (!kuuid_is_nil(&part.storage_uuid)) { 255 snprintf_uuid(uuid_buf, 256 sizeof(uuid_buf), 257 &part.storage_uuid); 258 make_dev_alias(ndev, 259 "part-by-uuid/%s", 260 uuid_buf); 261 udev_dict_set_cstr(ndev, "uuid", uuid_buf); 262 } 263 ndev->si_flags |= SI_REPROBE_TEST; 264 } 265 } 266 } 267 } else if (info->d_dsflags & DSO_COMPATLABEL) { 268 msg = NULL; 269 if (sp->ds_size >= 0x100000000ULL) 270 ops = &disklabel64_ops; 271 else 272 ops = &disklabel32_ops; 273 sp->ds_label = ops->op_clone_label(info, sp); 274 } else { 275 if (sp->ds_type == DOSPTYP_386BSD || /* XXX */ 276 sp->ds_type == DOSPTYP_NETBSD || 277 sp->ds_type == DOSPTYP_OPENBSD) { 278 log(LOG_WARNING, "%s: cannot find label (%s)\n", 279 dev->si_name, msg); 280 } 281 282 if (sp->ds_label.opaque != NULL && sp->ds_ops != NULL) { 283 /* Clear out old label - it's not around anymore */ 284 disk_debug(2, 285 "disk_probe_slice: clear out old diskabel on %s\n", 286 dev->si_name); 287 288 sp->ds_ops->op_freedisklabel(&sp->ds_label); 289 sp->ds_ops = NULL; 290 } 291 } 292 293 if (msg == NULL) { 294 sp->ds_wlabel = FALSE; 295 } 296 297 return (msg ? EINVAL : 0); 298 } 299 300 /* 301 * This routine is only called for newly minted drives or to reprobe 302 * a drive with no open slices. disk_probe_slice() is called directly 303 * when reprobing partition changes within slices. 304 */ 305 static void 306 disk_probe(struct disk *dp, int reprobe) 307 { 308 struct disk_info *info = &dp->d_info; 309 cdev_t dev = dp->d_cdev; 310 cdev_t ndev; 311 int error, i, sno; 312 struct diskslices *osp; 313 struct diskslice *sp; 314 char uuid_buf[128]; 315 316 KKASSERT (info->d_media_blksize != 0); 317 318 osp = dp->d_slice; 319 dp->d_slice = dsmakeslicestruct(BASE_SLICE, info); 320 disk_debug(1, "disk_probe (begin): %s\n", dp->d_cdev->si_name); 321 322 error = mbrinit(dev, info, &(dp->d_slice)); 323 if (error) { 324 dsgone(&osp); 325 return; 326 } 327 328 for (i = 0; i < dp->d_slice->dss_nslices; i++) { 329 /* 330 * Ignore the whole-disk slice, it has already been created. 331 */ 332 if (i == WHOLE_DISK_SLICE) 333 continue; 334 335 #if 1 336 /* 337 * Ignore the compatibility slice s0 if it's a device mapper 338 * volume. 339 */ 340 if ((i == COMPATIBILITY_SLICE) && 341 (info->d_dsflags & DSO_DEVICEMAPPER)) 342 continue; 343 #endif 344 345 sp = &dp->d_slice->dss_slices[i]; 346 347 /* 348 * Handle s0. s0 is a compatibility slice if there are no 349 * other slices and it has not otherwise been set up, else 350 * we ignore it. 351 */ 352 if (i == COMPATIBILITY_SLICE) { 353 sno = 0; 354 if (sp->ds_type == 0 && 355 dp->d_slice->dss_nslices == BASE_SLICE) { 356 sp->ds_size = info->d_media_blocks; 357 sp->ds_reserved = 0; 358 } 359 } else { 360 sno = i - 1; 361 sp->ds_reserved = 0; 362 } 363 364 /* 365 * Ignore 0-length slices 366 */ 367 if (sp->ds_size == 0) 368 continue; 369 370 if (reprobe && 371 (ndev = devfs_find_device_by_name("%ss%d", 372 dev->si_name, sno))) { 373 /* 374 * Device already exists and is still valid 375 */ 376 ndev->si_flags |= SI_REPROBE_TEST; 377 378 /* 379 * Destroy old UUID alias 380 */ 381 destroy_dev_alias(ndev, "slice-by-uuid/*"); 382 383 /* Create UUID alias */ 384 if (!kuuid_is_nil(&sp->ds_stor_uuid)) { 385 snprintf_uuid(uuid_buf, sizeof(uuid_buf), 386 &sp->ds_stor_uuid); 387 make_dev_alias(ndev, "slice-by-uuid/%s", 388 uuid_buf); 389 } 390 } else { 391 /* 392 * Else create new device 393 */ 394 ndev = make_dev_covering(&disk_ops, dp->d_rawdev->si_ops, 395 dkmakewholeslice(dkunit(dev), i), 396 UID_ROOT, GID_OPERATOR, 0640, 397 (info->d_dsflags & DSO_DEVICEMAPPER)? 398 "%s.s%d" : "%ss%d", dev->si_name, sno); 399 ndev->si_parent = dev; 400 ndev->si_iosize_max = dev->si_iosize_max; 401 udev_dict_set_cstr(ndev, "subsystem", "disk"); 402 /* Inherit parent's disk type */ 403 if (dp->d_disktype) { 404 udev_dict_set_cstr(ndev, "disk-type", 405 __DECONST(char *, dp->d_disktype)); 406 } 407 408 /* Create serno alias */ 409 if (dp->d_info.d_serialno) { 410 make_dev_alias(ndev, "serno/%s.s%d", 411 dp->d_info.d_serialno, sno); 412 } 413 414 /* Create UUID alias */ 415 if (!kuuid_is_nil(&sp->ds_stor_uuid)) { 416 snprintf_uuid(uuid_buf, sizeof(uuid_buf), 417 &sp->ds_stor_uuid); 418 make_dev_alias(ndev, "slice-by-uuid/%s", 419 uuid_buf); 420 } 421 422 ndev->si_disk = dp; 423 ndev->si_flags |= SI_REPROBE_TEST; 424 } 425 sp->ds_dev = ndev; 426 427 /* 428 * Probe appropriate slices for a disklabel 429 * 430 * XXX slice type 1 used by our gpt probe code. 431 * XXX slice type 0 used by mbr compat slice. 432 */ 433 if (sp->ds_type == DOSPTYP_386BSD || 434 sp->ds_type == DOSPTYP_NETBSD || 435 sp->ds_type == DOSPTYP_OPENBSD || 436 sp->ds_type == 0 || 437 sp->ds_type == 1) { 438 if (dp->d_slice->dss_first_bsd_slice == 0) 439 dp->d_slice->dss_first_bsd_slice = i; 440 disk_probe_slice(dp, ndev, i, reprobe); 441 } 442 } 443 dsgone(&osp); 444 disk_debug(1, "disk_probe (end): %s\n", dp->d_cdev->si_name); 445 } 446 447 448 static void 449 disk_msg_core(void *arg) 450 { 451 struct disk *dp; 452 struct diskslice *sp; 453 disk_msg_t msg; 454 int run; 455 456 lwkt_gettoken(&disklist_token); 457 lwkt_initport_thread(&disk_msg_port, curthread); 458 wakeup(curthread); /* synchronous startup */ 459 lwkt_reltoken(&disklist_token); 460 461 get_mplock(); /* not mpsafe yet? */ 462 run = 1; 463 464 while (run) { 465 msg = (disk_msg_t)lwkt_waitport(&disk_msg_port, 0); 466 467 switch (msg->hdr.u.ms_result) { 468 case DISK_DISK_PROBE: 469 dp = (struct disk *)msg->load; 470 disk_debug(1, 471 "DISK_DISK_PROBE: %s\n", 472 dp->d_cdev->si_name); 473 disk_iocom_update(dp); 474 disk_probe(dp, 0); 475 break; 476 case DISK_DISK_DESTROY: 477 dp = (struct disk *)msg->load; 478 disk_debug(1, 479 "DISK_DISK_DESTROY: %s\n", 480 dp->d_cdev->si_name); 481 disk_iocom_uninit(dp); 482 483 /* 484 * Interlock against struct disk enumerations. 485 * Wait for enumerations to complete then remove 486 * the dp from the list before tearing it down. 487 * 488 * This avoids races against e.g. 489 * dsched_thread_io_alloc(). 490 */ 491 lwkt_gettoken(&disklist_token); 492 while (dp->d_refs) 493 tsleep(&dp->d_refs, 0, "diskdel", hz / 10); 494 LIST_REMOVE(dp, d_list); 495 496 dsched_disk_destroy_callback(dp); 497 devfs_destroy_related(dp->d_cdev); 498 destroy_dev(dp->d_cdev); 499 destroy_only_dev(dp->d_rawdev); 500 501 lwkt_reltoken(&disklist_token); 502 503 if (dp->d_info.d_serialno) { 504 kfree(dp->d_info.d_serialno, M_TEMP); 505 dp->d_info.d_serialno = NULL; 506 } 507 break; 508 case DISK_UNPROBE: 509 dp = (struct disk *)msg->load; 510 disk_debug(1, 511 "DISK_DISK_UNPROBE: %s\n", 512 dp->d_cdev->si_name); 513 devfs_destroy_related(dp->d_cdev); 514 break; 515 case DISK_SLICE_REPROBE: 516 dp = (struct disk *)msg->load; 517 sp = (struct diskslice *)msg->load2; 518 devfs_clr_related_flag(sp->ds_dev, 519 SI_REPROBE_TEST); 520 disk_debug(1, 521 "DISK_SLICE_REPROBE: %s\n", 522 sp->ds_dev->si_name); 523 disk_probe_slice(dp, sp->ds_dev, 524 dkslice(sp->ds_dev), 1); 525 devfs_destroy_related_without_flag( 526 sp->ds_dev, SI_REPROBE_TEST); 527 break; 528 case DISK_DISK_REPROBE: 529 dp = (struct disk *)msg->load; 530 devfs_clr_related_flag(dp->d_cdev, SI_REPROBE_TEST); 531 disk_debug(1, 532 "DISK_DISK_REPROBE: %s\n", 533 dp->d_cdev->si_name); 534 disk_probe(dp, 1); 535 devfs_destroy_related_without_flag( 536 dp->d_cdev, SI_REPROBE_TEST); 537 break; 538 case DISK_SYNC: 539 disk_debug(1, "DISK_SYNC\n"); 540 break; 541 default: 542 devfs_debug(DEVFS_DEBUG_WARNING, 543 "disk_msg_core: unknown message " 544 "received at core\n"); 545 break; 546 } 547 lwkt_replymsg(&msg->hdr, 0); 548 } 549 lwkt_exit(); 550 } 551 552 553 /* 554 * Acts as a message drain. Any message that is replied to here gets 555 * destroyed and the memory freed. 556 */ 557 static void 558 disk_msg_autofree_reply(lwkt_port_t port, lwkt_msg_t msg) 559 { 560 objcache_put(disk_msg_cache, msg); 561 } 562 563 564 void 565 disk_msg_send(uint32_t cmd, void *load, void *load2) 566 { 567 disk_msg_t disk_msg; 568 lwkt_port_t port = &disk_msg_port; 569 570 disk_msg = objcache_get(disk_msg_cache, M_WAITOK); 571 572 lwkt_initmsg(&disk_msg->hdr, &disk_dispose_port, 0); 573 574 disk_msg->hdr.u.ms_result = cmd; 575 disk_msg->load = load; 576 disk_msg->load2 = load2; 577 KKASSERT(port); 578 lwkt_sendmsg(port, &disk_msg->hdr); 579 } 580 581 void 582 disk_msg_send_sync(uint32_t cmd, void *load, void *load2) 583 { 584 struct lwkt_port rep_port; 585 disk_msg_t disk_msg; 586 lwkt_port_t port; 587 588 disk_msg = objcache_get(disk_msg_cache, M_WAITOK); 589 port = &disk_msg_port; 590 591 /* XXX could probably use curthread's built-in msgport */ 592 lwkt_initport_thread(&rep_port, curthread); 593 lwkt_initmsg(&disk_msg->hdr, &rep_port, 0); 594 595 disk_msg->hdr.u.ms_result = cmd; 596 disk_msg->load = load; 597 disk_msg->load2 = load2; 598 599 lwkt_domsg(port, &disk_msg->hdr, 0); 600 objcache_put(disk_msg_cache, disk_msg); 601 } 602 603 /* 604 * Create a raw device for the dev_ops template (which is returned). Also 605 * create a slice and unit managed disk and overload the user visible 606 * device space with it. 607 * 608 * NOTE: The returned raw device is NOT a slice and unit managed device. 609 * It is an actual raw device representing the raw disk as specified by 610 * the passed dev_ops. The disk layer not only returns such a raw device, 611 * it also uses it internally when passing (modified) commands through. 612 */ 613 cdev_t 614 disk_create(int unit, struct disk *dp, struct dev_ops *raw_ops) 615 { 616 return _disk_create_named(NULL, unit, dp, raw_ops, 0); 617 } 618 619 cdev_t 620 disk_create_clone(int unit, struct disk *dp, 621 struct dev_ops *raw_ops) 622 { 623 return _disk_create_named(NULL, unit, dp, raw_ops, 1); 624 } 625 626 cdev_t 627 disk_create_named(const char *name, int unit, struct disk *dp, 628 struct dev_ops *raw_ops) 629 { 630 return _disk_create_named(name, unit, dp, raw_ops, 0); 631 } 632 633 cdev_t 634 disk_create_named_clone(const char *name, int unit, struct disk *dp, 635 struct dev_ops *raw_ops) 636 { 637 return _disk_create_named(name, unit, dp, raw_ops, 1); 638 } 639 640 static cdev_t 641 _disk_create_named(const char *name, int unit, struct disk *dp, 642 struct dev_ops *raw_ops, int clone) 643 { 644 cdev_t rawdev; 645 646 disk_debug(1, "disk_create (begin): %s%d\n", name, unit); 647 648 if (name) { 649 rawdev = make_only_dev(raw_ops, dkmakewholedisk(unit), 650 UID_ROOT, GID_OPERATOR, 0640, "%s", name); 651 } else { 652 rawdev = make_only_dev(raw_ops, dkmakewholedisk(unit), 653 UID_ROOT, GID_OPERATOR, 0640, 654 "%s%d", raw_ops->head.name, unit); 655 } 656 657 bzero(dp, sizeof(*dp)); 658 659 dp->d_rawdev = rawdev; 660 dp->d_raw_ops = raw_ops; 661 dp->d_dev_ops = &disk_ops; 662 663 if (name) { 664 if (clone) { 665 dp->d_cdev = make_only_dev_covering( 666 &disk_ops, dp->d_rawdev->si_ops, 667 dkmakewholedisk(unit), 668 UID_ROOT, GID_OPERATOR, 0640, 669 "%s", name); 670 } else { 671 dp->d_cdev = make_dev_covering( 672 &disk_ops, dp->d_rawdev->si_ops, 673 dkmakewholedisk(unit), 674 UID_ROOT, GID_OPERATOR, 0640, 675 "%s", name); 676 } 677 } else { 678 if (clone) { 679 dp->d_cdev = make_only_dev_covering( 680 &disk_ops, dp->d_rawdev->si_ops, 681 dkmakewholedisk(unit), 682 UID_ROOT, GID_OPERATOR, 0640, 683 "%s%d", raw_ops->head.name, unit); 684 } else { 685 dp->d_cdev = make_dev_covering( 686 &disk_ops, dp->d_rawdev->si_ops, 687 dkmakewholedisk(unit), 688 UID_ROOT, GID_OPERATOR, 0640, 689 "%s%d", raw_ops->head.name, unit); 690 } 691 } 692 693 udev_dict_set_cstr(dp->d_cdev, "subsystem", "disk"); 694 dp->d_cdev->si_disk = dp; 695 696 if (name) 697 dsched_disk_create_callback(dp, name, unit); 698 else 699 dsched_disk_create_callback(dp, raw_ops->head.name, unit); 700 701 lwkt_gettoken(&disklist_token); 702 LIST_INSERT_HEAD(&disklist, dp, d_list); 703 lwkt_reltoken(&disklist_token); 704 705 disk_iocom_init(dp); 706 707 disk_debug(1, "disk_create (end): %s%d\n", 708 (name != NULL)?(name):(raw_ops->head.name), unit); 709 710 return (dp->d_rawdev); 711 } 712 713 int 714 disk_setdisktype(struct disk *disk, const char *type) 715 { 716 int error; 717 718 KKASSERT(disk != NULL); 719 720 disk->d_disktype = type; 721 error = udev_dict_set_cstr(disk->d_cdev, "disk-type", 722 __DECONST(char *, type)); 723 return error; 724 } 725 726 int 727 disk_getopencount(struct disk *disk) 728 { 729 return disk->d_opencount; 730 } 731 732 static void 733 _setdiskinfo(struct disk *disk, struct disk_info *info) 734 { 735 char *oldserialno; 736 737 oldserialno = disk->d_info.d_serialno; 738 bcopy(info, &disk->d_info, sizeof(disk->d_info)); 739 info = &disk->d_info; 740 741 disk_debug(1, "_setdiskinfo: %s\n", disk->d_cdev->si_name); 742 743 /* 744 * The serial number is duplicated so the caller can throw 745 * their copy away. 746 */ 747 if (info->d_serialno && info->d_serialno[0] && 748 (info->d_serialno[0] != ' ' || strlen(info->d_serialno) > 1)) { 749 info->d_serialno = kstrdup(info->d_serialno, M_TEMP); 750 disk_cleanserial(info->d_serialno); 751 if (disk->d_cdev) { 752 make_dev_alias(disk->d_cdev, "serno/%s", 753 info->d_serialno); 754 } 755 } else { 756 info->d_serialno = NULL; 757 } 758 if (oldserialno) 759 kfree(oldserialno, M_TEMP); 760 761 dsched_disk_update_callback(disk, info); 762 763 /* 764 * The caller may set d_media_size or d_media_blocks and we 765 * calculate the other. 766 */ 767 KKASSERT(info->d_media_size == 0 || info->d_media_blocks == 0); 768 if (info->d_media_size == 0 && info->d_media_blocks) { 769 info->d_media_size = (u_int64_t)info->d_media_blocks * 770 info->d_media_blksize; 771 } else if (info->d_media_size && info->d_media_blocks == 0 && 772 info->d_media_blksize) { 773 info->d_media_blocks = info->d_media_size / 774 info->d_media_blksize; 775 } 776 777 /* 778 * The si_* fields for rawdev are not set until after the 779 * disk_create() call, so someone using the cooked version 780 * of the raw device (i.e. da0s0) will not get the right 781 * si_iosize_max unless we fix it up here. 782 */ 783 if (disk->d_cdev && disk->d_rawdev && 784 disk->d_cdev->si_iosize_max == 0) { 785 disk->d_cdev->si_iosize_max = disk->d_rawdev->si_iosize_max; 786 disk->d_cdev->si_bsize_phys = disk->d_rawdev->si_bsize_phys; 787 disk->d_cdev->si_bsize_best = disk->d_rawdev->si_bsize_best; 788 } 789 790 /* Add the serial number to the udev_dictionary */ 791 if (info->d_serialno) 792 udev_dict_set_cstr(disk->d_cdev, "serno", info->d_serialno); 793 } 794 795 /* 796 * Disk drivers must call this routine when media parameters are available 797 * or have changed. 798 */ 799 void 800 disk_setdiskinfo(struct disk *disk, struct disk_info *info) 801 { 802 _setdiskinfo(disk, info); 803 disk_msg_send(DISK_DISK_PROBE, disk, NULL); 804 disk_debug(1, "disk_setdiskinfo: sent probe for %s\n", 805 disk->d_cdev->si_name); 806 } 807 808 void 809 disk_setdiskinfo_sync(struct disk *disk, struct disk_info *info) 810 { 811 _setdiskinfo(disk, info); 812 disk_msg_send_sync(DISK_DISK_PROBE, disk, NULL); 813 disk_debug(1, "disk_setdiskinfo_sync: sent probe for %s\n", 814 disk->d_cdev->si_name); 815 } 816 817 /* 818 * This routine is called when an adapter detaches. The higher level 819 * managed disk device is destroyed while the lower level raw device is 820 * released. 821 */ 822 void 823 disk_destroy(struct disk *disk) 824 { 825 disk_msg_send_sync(DISK_DISK_DESTROY, disk, NULL); 826 return; 827 } 828 829 int 830 disk_dumpcheck(cdev_t dev, u_int64_t *size, 831 u_int64_t *blkno, u_int32_t *secsize) 832 { 833 struct partinfo pinfo; 834 int error; 835 836 bzero(&pinfo, sizeof(pinfo)); 837 error = dev_dioctl(dev, DIOCGPART, (void *)&pinfo, 0, 838 proc0.p_ucred, NULL, NULL); 839 if (error) 840 return (error); 841 842 if (pinfo.media_blksize == 0) 843 return (ENXIO); 844 845 if (blkno) /* XXX: make sure this reserved stuff is right */ 846 *blkno = pinfo.reserved_blocks + 847 pinfo.media_offset / pinfo.media_blksize; 848 if (secsize) 849 *secsize = pinfo.media_blksize; 850 if (size) 851 *size = (pinfo.media_blocks - pinfo.reserved_blocks); 852 853 return (0); 854 } 855 856 int 857 disk_dumpconf(cdev_t dev, u_int onoff) 858 { 859 struct dumperinfo di; 860 u_int64_t size, blkno; 861 u_int32_t secsize; 862 int error; 863 864 if (!onoff) 865 return set_dumper(NULL); 866 867 error = disk_dumpcheck(dev, &size, &blkno, &secsize); 868 869 if (error) 870 return ENXIO; 871 872 bzero(&di, sizeof(struct dumperinfo)); 873 di.dumper = diskdump; 874 di.priv = dev; 875 di.blocksize = secsize; 876 di.maxiosize = dev->si_iosize_max; 877 di.mediaoffset = blkno * DEV_BSIZE; 878 di.mediasize = size * DEV_BSIZE; 879 880 return set_dumper(&di); 881 } 882 883 void 884 disk_unprobe(struct disk *disk) 885 { 886 if (disk == NULL) 887 return; 888 889 disk_msg_send_sync(DISK_UNPROBE, disk, NULL); 890 } 891 892 void 893 disk_invalidate (struct disk *disk) 894 { 895 dsgone(&disk->d_slice); 896 } 897 898 /* 899 * Enumerate disks, pass a marker and an initial NULL dp to initialize, 900 * then loop with the previously returned dp. 901 * 902 * The returned dp will be referenced, preventing its destruction. When 903 * you pass the returned dp back into the loop the ref is dropped. 904 * 905 * WARNING: If terminating your loop early you must call 906 * disk_enumerate_stop(). 907 */ 908 struct disk * 909 disk_enumerate(struct disk *marker, struct disk *dp) 910 { 911 lwkt_gettoken(&disklist_token); 912 if (dp) { 913 --dp->d_refs; 914 dp = LIST_NEXT(marker, d_list); 915 LIST_REMOVE(marker, d_list); 916 } else { 917 bzero(marker, sizeof(*marker)); 918 marker->d_flags = DISKFLAG_MARKER; 919 dp = LIST_FIRST(&disklist); 920 } 921 while (dp) { 922 if ((dp->d_flags & DISKFLAG_MARKER) == 0) 923 break; 924 dp = LIST_NEXT(dp, d_list); 925 } 926 if (dp) { 927 ++dp->d_refs; 928 LIST_INSERT_AFTER(dp, marker, d_list); 929 } 930 lwkt_reltoken(&disklist_token); 931 return (dp); 932 } 933 934 /* 935 * Terminate an enumeration early. Do not call this function if the 936 * enumeration ended normally. dp can be NULL, indicating that you 937 * wish to retain the ref count on dp. 938 * 939 * This function removes the marker. 940 */ 941 void 942 disk_enumerate_stop(struct disk *marker, struct disk *dp) 943 { 944 lwkt_gettoken(&disklist_token); 945 LIST_REMOVE(marker, d_list); 946 if (dp) 947 --dp->d_refs; 948 lwkt_reltoken(&disklist_token); 949 } 950 951 static 952 int 953 sysctl_disks(SYSCTL_HANDLER_ARGS) 954 { 955 struct disk marker; 956 struct disk *dp; 957 int error, first; 958 959 first = 1; 960 error = 0; 961 dp = NULL; 962 963 while ((dp = disk_enumerate(&marker, dp))) { 964 if (!first) { 965 error = SYSCTL_OUT(req, " ", 1); 966 if (error) { 967 disk_enumerate_stop(&marker, dp); 968 break; 969 } 970 } else { 971 first = 0; 972 } 973 error = SYSCTL_OUT(req, dp->d_rawdev->si_name, 974 strlen(dp->d_rawdev->si_name)); 975 if (error) { 976 disk_enumerate_stop(&marker, dp); 977 break; 978 } 979 } 980 if (error == 0) 981 error = SYSCTL_OUT(req, "", 1); 982 return error; 983 } 984 985 SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD, NULL, 0, 986 sysctl_disks, "A", "names of available disks"); 987 988 /* 989 * Open a disk device or partition. 990 */ 991 static 992 int 993 diskopen(struct dev_open_args *ap) 994 { 995 cdev_t dev = ap->a_head.a_dev; 996 struct disk *dp; 997 int error; 998 999 /* 1000 * dp can't be NULL here XXX. 1001 * 1002 * d_slice will be NULL if setdiskinfo() has not been called yet. 1003 * setdiskinfo() is typically called whether the disk is present 1004 * or not (e.g. CD), but the base disk device is created first 1005 * and there may be a race. 1006 */ 1007 dp = dev->si_disk; 1008 if (dp == NULL || dp->d_slice == NULL) 1009 return (ENXIO); 1010 error = 0; 1011 1012 /* 1013 * Deal with open races 1014 */ 1015 get_mplock(); 1016 while (dp->d_flags & DISKFLAG_LOCK) { 1017 dp->d_flags |= DISKFLAG_WANTED; 1018 error = tsleep(dp, PCATCH, "diskopen", hz); 1019 if (error) { 1020 rel_mplock(); 1021 return (error); 1022 } 1023 } 1024 dp->d_flags |= DISKFLAG_LOCK; 1025 1026 /* 1027 * Open the underlying raw device. 1028 */ 1029 if (!dsisopen(dp->d_slice)) { 1030 #if 0 1031 if (!pdev->si_iosize_max) 1032 pdev->si_iosize_max = dev->si_iosize_max; 1033 #endif 1034 error = dev_dopen(dp->d_rawdev, ap->a_oflags, 1035 ap->a_devtype, ap->a_cred, NULL); 1036 } 1037 1038 if (error) 1039 goto out; 1040 error = dsopen(dev, ap->a_devtype, dp->d_info.d_dsflags, 1041 &dp->d_slice, &dp->d_info); 1042 if (!dsisopen(dp->d_slice)) { 1043 dev_dclose(dp->d_rawdev, ap->a_oflags, ap->a_devtype, NULL); 1044 } 1045 out: 1046 dp->d_flags &= ~DISKFLAG_LOCK; 1047 if (dp->d_flags & DISKFLAG_WANTED) { 1048 dp->d_flags &= ~DISKFLAG_WANTED; 1049 wakeup(dp); 1050 } 1051 rel_mplock(); 1052 1053 KKASSERT(dp->d_opencount >= 0); 1054 /* If the open was successful, bump open count */ 1055 if (error == 0) 1056 atomic_add_int(&dp->d_opencount, 1); 1057 1058 return(error); 1059 } 1060 1061 /* 1062 * Close a disk device or partition 1063 */ 1064 static 1065 int 1066 diskclose(struct dev_close_args *ap) 1067 { 1068 cdev_t dev = ap->a_head.a_dev; 1069 struct disk *dp; 1070 int error; 1071 int lcount; 1072 1073 error = 0; 1074 dp = dev->si_disk; 1075 1076 /* 1077 * The cdev_t represents the disk/slice/part. The shared 1078 * dp structure governs all cdevs associated with the disk. 1079 * 1080 * As a safety only close the underlying raw device on the last 1081 * close the disk device if our tracking of the slices/partitions 1082 * also indicates nothing is open. 1083 */ 1084 KKASSERT(dp->d_opencount >= 1); 1085 lcount = atomic_fetchadd_int(&dp->d_opencount, -1); 1086 1087 get_mplock(); 1088 dsclose(dev, ap->a_devtype, dp->d_slice); 1089 if (lcount <= 1 && !dsisopen(dp->d_slice)) { 1090 error = dev_dclose(dp->d_rawdev, ap->a_fflag, ap->a_devtype, NULL); 1091 } 1092 rel_mplock(); 1093 return (error); 1094 } 1095 1096 /* 1097 * First execute the ioctl on the disk device, and if it isn't supported 1098 * try running it on the backing device. 1099 */ 1100 static 1101 int 1102 diskioctl(struct dev_ioctl_args *ap) 1103 { 1104 cdev_t dev = ap->a_head.a_dev; 1105 struct disk *dp; 1106 int error; 1107 u_int u; 1108 1109 dp = dev->si_disk; 1110 if (dp == NULL) 1111 return (ENXIO); 1112 1113 devfs_debug(DEVFS_DEBUG_DEBUG, 1114 "diskioctl: cmd is: %lx (name: %s)\n", 1115 ap->a_cmd, dev->si_name); 1116 devfs_debug(DEVFS_DEBUG_DEBUG, 1117 "diskioctl: &dp->d_slice is: %p, %p\n", 1118 &dp->d_slice, dp->d_slice); 1119 1120 if (ap->a_cmd == DIOCGKERNELDUMP) { 1121 u = *(u_int *)ap->a_data; 1122 return disk_dumpconf(dev, u); 1123 } 1124 1125 if (ap->a_cmd == DIOCRECLUSTER && dev == dp->d_cdev) { 1126 error = disk_iocom_ioctl(dp, ap->a_cmd, ap->a_data); 1127 return error; 1128 } 1129 1130 if (&dp->d_slice == NULL || dp->d_slice == NULL || 1131 ((dp->d_info.d_dsflags & DSO_DEVICEMAPPER) && 1132 dkslice(dev) == WHOLE_DISK_SLICE)) { 1133 error = ENOIOCTL; 1134 } else { 1135 get_mplock(); 1136 error = dsioctl(dev, ap->a_cmd, ap->a_data, ap->a_fflag, 1137 &dp->d_slice, &dp->d_info); 1138 rel_mplock(); 1139 } 1140 1141 if (error == ENOIOCTL) { 1142 error = dev_dioctl(dp->d_rawdev, ap->a_cmd, ap->a_data, 1143 ap->a_fflag, ap->a_cred, NULL, NULL); 1144 } 1145 return (error); 1146 } 1147 1148 /* 1149 * Execute strategy routine 1150 */ 1151 static 1152 int 1153 diskstrategy(struct dev_strategy_args *ap) 1154 { 1155 cdev_t dev = ap->a_head.a_dev; 1156 struct bio *bio = ap->a_bio; 1157 struct bio *nbio; 1158 struct disk *dp; 1159 1160 dp = dev->si_disk; 1161 1162 if (dp == NULL) { 1163 bio->bio_buf->b_error = ENXIO; 1164 bio->bio_buf->b_flags |= B_ERROR; 1165 biodone(bio); 1166 return(0); 1167 } 1168 KKASSERT(dev->si_disk == dp); 1169 1170 /* 1171 * The dscheck() function will also transform the slice relative 1172 * block number i.e. bio->bio_offset into a block number that can be 1173 * passed directly to the underlying raw device. If dscheck() 1174 * returns NULL it will have handled the bio for us (e.g. EOF 1175 * or error due to being beyond the device size). 1176 */ 1177 if ((nbio = dscheck(dev, bio, dp->d_slice)) != NULL) { 1178 dsched_queue(dp, nbio); 1179 } else { 1180 biodone(bio); 1181 } 1182 return(0); 1183 } 1184 1185 /* 1186 * Return the partition size in ?blocks? 1187 */ 1188 static 1189 int 1190 diskpsize(struct dev_psize_args *ap) 1191 { 1192 cdev_t dev = ap->a_head.a_dev; 1193 struct disk *dp; 1194 1195 dp = dev->si_disk; 1196 if (dp == NULL) 1197 return(ENODEV); 1198 1199 ap->a_result = dssize(dev, &dp->d_slice); 1200 1201 if ((ap->a_result == -1) && 1202 (dp->d_info.d_dsflags & DSO_RAWPSIZE)) { 1203 ap->a_head.a_dev = dp->d_rawdev; 1204 return dev_doperate(&ap->a_head); 1205 } 1206 return(0); 1207 } 1208 1209 static int 1210 diskdump(struct dev_dump_args *ap) 1211 { 1212 cdev_t dev = ap->a_head.a_dev; 1213 struct disk *dp = dev->si_disk; 1214 u_int64_t size, offset; 1215 int error; 1216 1217 error = disk_dumpcheck(dev, &size, &ap->a_blkno, &ap->a_secsize); 1218 /* XXX: this should probably go in disk_dumpcheck somehow */ 1219 if (ap->a_length != 0) { 1220 size *= DEV_BSIZE; 1221 offset = ap->a_blkno * DEV_BSIZE; 1222 if ((ap->a_offset < offset) || 1223 (ap->a_offset + ap->a_length - offset > size)) { 1224 kprintf("Attempt to write outside dump " 1225 "device boundaries.\n"); 1226 error = ENOSPC; 1227 } 1228 } 1229 1230 if (error == 0) { 1231 ap->a_head.a_dev = dp->d_rawdev; 1232 error = dev_doperate(&ap->a_head); 1233 } 1234 1235 return(error); 1236 } 1237 1238 1239 SYSCTL_INT(_debug_sizeof, OID_AUTO, diskslices, CTLFLAG_RD, 1240 0, sizeof(struct diskslices), "sizeof(struct diskslices)"); 1241 1242 SYSCTL_INT(_debug_sizeof, OID_AUTO, disk, CTLFLAG_RD, 1243 0, sizeof(struct disk), "sizeof(struct disk)"); 1244 1245 /* 1246 * Reorder interval for burst write allowance and minor write 1247 * allowance. 1248 * 1249 * We always want to trickle some writes in to make use of the 1250 * disk's zone cache. Bursting occurs on a longer interval and only 1251 * runningbufspace is well over the hirunningspace limit. 1252 */ 1253 int bioq_reorder_burst_interval = 60; /* should be multiple of minor */ 1254 SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_burst_interval, 1255 CTLFLAG_RW, &bioq_reorder_burst_interval, 0, ""); 1256 int bioq_reorder_minor_interval = 5; 1257 SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_minor_interval, 1258 CTLFLAG_RW, &bioq_reorder_minor_interval, 0, ""); 1259 1260 int bioq_reorder_burst_bytes = 3000000; 1261 SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_burst_bytes, 1262 CTLFLAG_RW, &bioq_reorder_burst_bytes, 0, ""); 1263 int bioq_reorder_minor_bytes = 262144; 1264 SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_minor_bytes, 1265 CTLFLAG_RW, &bioq_reorder_minor_bytes, 0, ""); 1266 1267 1268 /* 1269 * Order I/Os. Generally speaking this code is designed to make better 1270 * use of drive zone caches. A drive zone cache can typically track linear 1271 * reads or writes for around 16 zones simultaniously. 1272 * 1273 * Read prioritization issues: It is possible for hundreds of megabytes worth 1274 * of writes to be queued asynchronously. This creates a huge bottleneck 1275 * for reads which reduce read bandwidth to a trickle. 1276 * 1277 * To solve this problem we generally reorder reads before writes. 1278 * 1279 * However, a large number of random reads can also starve writes and 1280 * make poor use of the drive zone cache so we allow writes to trickle 1281 * in every N reads. 1282 */ 1283 void 1284 bioqdisksort(struct bio_queue_head *bioq, struct bio *bio) 1285 { 1286 /* 1287 * The BIO wants to be ordered. Adding to the tail also 1288 * causes transition to be set to NULL, forcing the ordering 1289 * of all prior I/O's. 1290 */ 1291 if (bio->bio_buf->b_flags & B_ORDERED) { 1292 bioq_insert_tail(bioq, bio); 1293 return; 1294 } 1295 1296 switch(bio->bio_buf->b_cmd) { 1297 case BUF_CMD_READ: 1298 if (bioq->transition) { 1299 /* 1300 * Insert before the first write. Bleedover writes 1301 * based on reorder intervals to prevent starvation. 1302 */ 1303 TAILQ_INSERT_BEFORE(bioq->transition, bio, bio_act); 1304 ++bioq->reorder; 1305 if (bioq->reorder % bioq_reorder_minor_interval == 0) { 1306 bioqwritereorder(bioq); 1307 if (bioq->reorder >= 1308 bioq_reorder_burst_interval) { 1309 bioq->reorder = 0; 1310 } 1311 } 1312 } else { 1313 /* 1314 * No writes queued (or ordering was forced), 1315 * insert at tail. 1316 */ 1317 TAILQ_INSERT_TAIL(&bioq->queue, bio, bio_act); 1318 } 1319 break; 1320 case BUF_CMD_WRITE: 1321 /* 1322 * Writes are always appended. If no writes were previously 1323 * queued or an ordered tail insertion occured the transition 1324 * field will be NULL. 1325 */ 1326 TAILQ_INSERT_TAIL(&bioq->queue, bio, bio_act); 1327 if (bioq->transition == NULL) 1328 bioq->transition = bio; 1329 break; 1330 default: 1331 /* 1332 * All other request types are forced to be ordered. 1333 */ 1334 bioq_insert_tail(bioq, bio); 1335 break; 1336 } 1337 } 1338 1339 /* 1340 * Move the read-write transition point to prevent reads from 1341 * completely starving our writes. This brings a number of writes into 1342 * the fold every N reads. 1343 * 1344 * We bring a few linear writes into the fold on a minor interval 1345 * and we bring a non-linear burst of writes into the fold on a major 1346 * interval. Bursting only occurs if runningbufspace is really high 1347 * (typically from syncs, fsyncs, or HAMMER flushes). 1348 */ 1349 static 1350 void 1351 bioqwritereorder(struct bio_queue_head *bioq) 1352 { 1353 struct bio *bio; 1354 off_t next_offset; 1355 size_t left; 1356 size_t n; 1357 int check_off; 1358 1359 if (bioq->reorder < bioq_reorder_burst_interval || 1360 !buf_runningbufspace_severe()) { 1361 left = (size_t)bioq_reorder_minor_bytes; 1362 check_off = 1; 1363 } else { 1364 left = (size_t)bioq_reorder_burst_bytes; 1365 check_off = 0; 1366 } 1367 1368 next_offset = bioq->transition->bio_offset; 1369 while ((bio = bioq->transition) != NULL && 1370 (check_off == 0 || next_offset == bio->bio_offset) 1371 ) { 1372 n = bio->bio_buf->b_bcount; 1373 next_offset = bio->bio_offset + n; 1374 bioq->transition = TAILQ_NEXT(bio, bio_act); 1375 if (left < n) 1376 break; 1377 left -= n; 1378 } 1379 } 1380 1381 /* 1382 * Bounds checking against the media size, used for the raw partition. 1383 * secsize, mediasize and b_blkno must all be the same units. 1384 * Possibly this has to be DEV_BSIZE (512). 1385 */ 1386 int 1387 bounds_check_with_mediasize(struct bio *bio, int secsize, uint64_t mediasize) 1388 { 1389 struct buf *bp = bio->bio_buf; 1390 int64_t sz; 1391 1392 sz = howmany(bp->b_bcount, secsize); 1393 1394 if (bio->bio_offset/DEV_BSIZE + sz > mediasize) { 1395 sz = mediasize - bio->bio_offset/DEV_BSIZE; 1396 if (sz == 0) { 1397 /* If exactly at end of disk, return EOF. */ 1398 bp->b_resid = bp->b_bcount; 1399 return 0; 1400 } 1401 if (sz < 0) { 1402 /* If past end of disk, return EINVAL. */ 1403 bp->b_error = EINVAL; 1404 return 0; 1405 } 1406 /* Otherwise, truncate request. */ 1407 bp->b_bcount = sz * secsize; 1408 } 1409 1410 return 1; 1411 } 1412 1413 /* 1414 * Disk error is the preface to plaintive error messages 1415 * about failing disk transfers. It prints messages of the form 1416 1417 hp0g: hard error reading fsbn 12345 of 12344-12347 (hp0 bn %d cn %d tn %d sn %d) 1418 1419 * if the offset of the error in the transfer and a disk label 1420 * are both available. blkdone should be -1 if the position of the error 1421 * is unknown; the disklabel pointer may be null from drivers that have not 1422 * been converted to use them. The message is printed with kprintf 1423 * if pri is LOG_PRINTF, otherwise it uses log at the specified priority. 1424 * The message should be completed (with at least a newline) with kprintf 1425 * or log(-1, ...), respectively. There is no trailing space. 1426 */ 1427 void 1428 diskerr(struct bio *bio, cdev_t dev, const char *what, int pri, int donecnt) 1429 { 1430 struct buf *bp = bio->bio_buf; 1431 const char *term; 1432 1433 switch(bp->b_cmd) { 1434 case BUF_CMD_READ: 1435 term = "read"; 1436 break; 1437 case BUF_CMD_WRITE: 1438 term = "write"; 1439 break; 1440 default: 1441 term = "access"; 1442 break; 1443 } 1444 kprintf("%s: %s %sing ", dev->si_name, what, term); 1445 kprintf("offset %012llx for %d", 1446 (long long)bio->bio_offset, 1447 bp->b_bcount); 1448 1449 if (donecnt) 1450 kprintf(" (%d bytes completed)", donecnt); 1451 } 1452 1453 /* 1454 * Locate a disk device 1455 */ 1456 cdev_t 1457 disk_locate(const char *devname) 1458 { 1459 return devfs_find_device_by_name("%s", devname); 1460 } 1461 1462 void 1463 disk_config(void *arg) 1464 { 1465 disk_msg_send_sync(DISK_SYNC, NULL, NULL); 1466 } 1467 1468 static void 1469 disk_init(void) 1470 { 1471 struct thread* td_core; 1472 1473 disk_msg_cache = objcache_create("disk-msg-cache", 0, 0, 1474 NULL, NULL, NULL, 1475 objcache_malloc_alloc, 1476 objcache_malloc_free, 1477 &disk_msg_malloc_args); 1478 1479 lwkt_token_init(&disklist_token, "disks"); 1480 1481 /* 1482 * Initialize the reply-only port which acts as a message drain 1483 */ 1484 lwkt_initport_replyonly(&disk_dispose_port, disk_msg_autofree_reply); 1485 1486 lwkt_gettoken(&disklist_token); 1487 lwkt_create(disk_msg_core, /*args*/NULL, &td_core, NULL, 1488 0, -1, "disk_msg_core"); 1489 tsleep(td_core, 0, "diskcore", 0); 1490 lwkt_reltoken(&disklist_token); 1491 } 1492 1493 static void 1494 disk_uninit(void) 1495 { 1496 objcache_destroy(disk_msg_cache); 1497 } 1498 1499 /* 1500 * Clean out illegal characters in serial numbers. 1501 */ 1502 static void 1503 disk_cleanserial(char *serno) 1504 { 1505 char c; 1506 1507 while ((c = *serno) != 0) { 1508 if (c >= 'a' && c <= 'z') 1509 ; 1510 else if (c >= 'A' && c <= 'Z') 1511 ; 1512 else if (c >= '0' && c <= '9') 1513 ; 1514 else if (c == '-' || c == '@' || c == '+' || c == '.') 1515 ; 1516 else 1517 c = '_'; 1518 *serno++= c; 1519 } 1520 } 1521 1522 TUNABLE_INT("kern.disk_debug", &disk_debug_enable); 1523 SYSCTL_INT(_kern, OID_AUTO, disk_debug, CTLFLAG_RW, &disk_debug_enable, 1524 0, "Enable subr_disk debugging"); 1525 1526 SYSINIT(disk_register, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST, disk_init, NULL); 1527 SYSUNINIT(disk_register, SI_SUB_PRE_DRIVERS, SI_ORDER_ANY, disk_uninit, NULL); 1528