Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/sys/disk.h
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1 /* $NetBSD: disk.h,v 1.77 2021/07/24 21:31:39 andvar Exp $ */ 2 3 /*- 4 * Copyright (c) 1996, 1997, 2004 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1992, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * This software was developed by the Computer Systems Engineering group 38 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 39 * contributed to Berkeley. 40 * 41 * All advertising materials mentioning features or use of this software 42 * must display the following acknowledgement: 43 * This product includes software developed by the University of 44 * California, Lawrence Berkeley Laboratories. 45 * 46 * Redistribution and use in source and binary forms, with or without 47 * modification, are permitted provided that the following conditions 48 * are met: 49 * 1. Redistributions of source code must retain the above copyright 50 * notice, this list of conditions and the following disclaimer. 51 * 2. Redistributions in binary form must reproduce the above copyright 52 * notice, this list of conditions and the following disclaimer in the 53 * documentation and/or other materials provided with the distribution. 54 * 3. Neither the name of the University nor the names of its contributors 55 * may be used to endorse or promote products derived from this software 56 * without specific prior written permission. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 61 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 68 * SUCH DAMAGE. 69 * 70 * from: Header: disk.h,v 1.5 92/11/19 04:33:03 torek Exp (LBL) 71 * 72 * @(#)disk.h 8.2 (Berkeley) 1/9/95 73 */ 74 75 #ifndef _SYS_DISK_H_ 76 #define _SYS_DISK_H_ 77 78 /* 79 * Disk device structures. 80 */ 81 82 #include <sys/dkio.h> 83 #include <sys/time.h> 84 #include <sys/queue.h> 85 #include <sys/iostat.h> 86 87 /* 88 * Disk information dictionary. 89 * 90 * This contains general information for disk devices. 91 * 92 * <dict> 93 * <key>type</key> 94 * <string>...</string> 95 * <key>geometry</key> 96 * <dict> 97 * <!-- See below for disk geometry dictionary 98 * contents. --> 99 * </dict> 100 * 101 * <!-- optional information --> 102 * <key>rpm</key> 103 * <integer>...</integer> 104 * <key>sector-interleave</key> 105 * <integer>...</integer> 106 * <key>track-skew</key> 107 * <integer>...</integer> 108 * <key>cylinder-skew</key> 109 * <integer>...</integer> 110 * <key>head-switch-usecs</key> 111 * <integer>...</integer> 112 * <key>track-seek-usecs</key> 113 * <integer>...</integer> 114 * <key>removable</key> 115 * <false/> 116 * <key>ecc</key> 117 * <false/> 118 * <key>bad-sector-forwarding</key> 119 * <true/> 120 * <key>ramdisk</key> 121 * <false/> 122 * <key>back-to-back-transfers</key> 123 * <true/> 124 * 125 * <!-- additional information for SMD drives --> 126 * <key>smd-skip-sectoring</key> 127 * <false/> 128 * <!-- XXX better names for these properties --> 129 * <key>smd-mindist</key> 130 * <integer>...</integer> 131 * <key>smd-maxdist</key> 132 * <integer>...</integer> 133 * <key>smd-sdist</key> 134 * <integer>...</integer> 135 * 136 * <!-- additional information for ST506 drives --> 137 * <!-- XXX better names for these properties --> 138 * <key>st506-precompcyl</key> 139 * <integer>...</integer> 140 * <key>st506-gap3</key> 141 * <integer>...</integer> 142 * 143 * <!-- additional information for ATA drives --> 144 * <!-- XXX --> 145 * 146 * <!-- additional information for SCSI drives --> 147 * <!-- XXX --> 148 * </dict> 149 */ 150 151 /* 152 * dkwedge_info: 153 * 154 * Information needed to configure (or query configuration of) a 155 * disk wedge. 156 */ 157 struct dkwedge_info { 158 char dkw_devname[16];/* device-style name (e.g. "dk0") */ 159 uint8_t dkw_wname[128]; /* wedge name (Unicode, UTF-8) */ 160 char dkw_parent[16]; /* parent disk device name */ 161 daddr_t dkw_offset; /* LBA offset of wedge in parent */ 162 uint64_t dkw_size; /* size of wedge in blocks */ 163 char dkw_ptype[32]; /* partition type string */ 164 }; 165 166 /* 167 * dkwedge_list: 168 * 169 * Structure used to query a list of wedges. 170 */ 171 struct dkwedge_list { 172 void *dkwl_buf; /* storage for dkwedge_info array */ 173 size_t dkwl_bufsize; /* size of that buffer */ 174 u_int dkwl_nwedges; /* total number of wedges */ 175 u_int dkwl_ncopied; /* number actually copied */ 176 }; 177 178 /* Some common partition types */ 179 #define DKW_PTYPE_UNKNOWN "" 180 #define DKW_PTYPE_UNUSED "unused" 181 #define DKW_PTYPE_SWAP "swap" 182 #define DKW_PTYPE_V6 "v6" 183 #define DKW_PTYPE_V7 "v7" 184 #define DKW_PTYPE_SYSV "sysv" 185 #define DKW_PTYPE_V71K "v71k" 186 #define DKW_PTYPE_V8 "v8" 187 #define DKW_PTYPE_FFS "ffs" 188 #define DKW_PTYPE_FAT "msdos" 189 #define DKW_PTYPE_LFS "lfs" 190 #define DKW_PTYPE_OTHER "other" 191 #define DKW_PTYPE_HPFS "hpfs" 192 #define DKW_PTYPE_ISO9660 "cd9660" 193 #define DKW_PTYPE_BOOT "boot" 194 #define DKW_PTYPE_AMIGADOS "ados" 195 #define DKW_PTYPE_HFS "hfs" 196 #define DKW_PTYPE_FILECORE "filecore" 197 #define DKW_PTYPE_EXT2FS "ext2fs" 198 #define DKW_PTYPE_NTFS "ntfs" 199 #define DKW_PTYPE_RAIDFRAME "raidframe" 200 #define DKW_PTYPE_CCD "ccd" 201 #define DKW_PTYPE_JFS2 "jfs2" 202 #define DKW_PTYPE_APPLEUFS "appleufs" 203 #define DKW_PTYPE_VINUM "vinum" 204 #define DKW_PTYPE_UDF "udf" 205 #define DKW_PTYPE_APPLEHFS "hfs" 206 #define DKW_PTYPE_SYSVBFS "sysvbfs" 207 #define DKW_PTYPE_EFS "efs" 208 #define DKW_PTYPE_NILFS "nilfs" 209 #define DKW_PTYPE_CGD "cgd" 210 #define DKW_PTYPE_MINIXFS3 "minixfs3" 211 #define DKW_PTYPE_VMKCORE "vmkcore" 212 #define DKW_PTYPE_VMFS "vmfs" 213 #define DKW_PTYPE_VMWRESV "vmwresv" 214 #define DKW_PTYPE_ZFS "zfs" 215 216 /* 217 * Ensure each symbol used in FSTYPE_DEFN in <sys/disklabel.h> 218 * has a corresponding DKW_PTYPE_* definition. 219 */ 220 #define DKW_PTYPE_MSDOS DKW_PTYPE_FAT 221 #define DKW_PTYPE_BSDFFS DKW_PTYPE_FFS 222 #define DKW_PTYPE_BSDLFS DKW_PTYPE_LFS 223 #define DKW_PTYPE_ADOS DKW_PTYPE_AMIGADOS 224 #define DKW_PTYPE_EX2FS DKW_PTYPE_EXT2FS 225 #define DKW_PTYPE_RAID DKW_PTYPE_RAIDFRAME 226 227 /* 228 * Disk geometry dictionary. 229 * 230 * NOTE: Not all geometry information is relevant for every kind of disk. 231 * 232 * <dict> 233 * <key>sectors-per-unit</key> 234 * <integer>...</integer> 235 * <key>sector-size</key> 236 * <integer>...</integer> 237 * <key>sectors-per-track</key> 238 * <integer>...</integer> 239 * <key>tracks-per-cylinder</key> 240 * <integer>...</integer> 241 * <key>cylinders-per-unit</key> 242 * <integer>...</integer> 243 * <key>physical-cylinders-per-unit</key> 244 * <integer>...</integer> 245 * <key>spare-sectors-per-track</key> 246 * <integer>...</integer> 247 * <key>spare-sectors-per-cylinder</key> 248 * <integer>...</integer> 249 * <key>alternative-cylinders</key> 250 * <integer>...</integer> 251 * </dict> 252 * NOTE: Not all geometry information is relevant for every kind of disk. 253 */ 254 255 struct disk_geom { 256 int64_t dg_secperunit; /* # of data sectors per unit */ 257 uint32_t dg_secsize; /* # of bytes per sector */ 258 uint32_t dg_nsectors; /* # of data sectors per track */ 259 uint32_t dg_ntracks; /* # of tracks per cylinder */ 260 uint32_t dg_ncylinders; /* # of data cylinders per unit */ 261 uint32_t dg_secpercyl; /* # of data sectors per cylinder */ 262 uint32_t dg_pcylinders; /* # of physical cylinders per unit */ 263 264 /* 265 * Spares (bad sector replacements) below are not counted in 266 * dg_nsectors or dg_secpercyl. Spare sectors are assumed to 267 * be physical sectors which occupy space at the end of each 268 * track and/or cylinder. 269 */ 270 uint32_t dg_sparespertrack; 271 uint32_t dg_sparespercyl; 272 /* 273 * Alternative cylinders include maintenance, replacement, 274 * configuration description areas, etc. 275 */ 276 uint32_t dg_acylinders; 277 }; 278 279 /* 280 * Bad sector lists per fixed disk 281 */ 282 struct disk_badsectors { 283 SLIST_ENTRY(disk_badsectors) dbs_next; 284 daddr_t dbs_min; /* min. sector number */ 285 daddr_t dbs_max; /* max. sector number */ 286 struct timeval dbs_failedat; /* first failure at */ 287 }; 288 289 struct disk_badsecinfo { 290 uint32_t dbsi_bufsize; /* size of region pointed to */ 291 uint32_t dbsi_skip; /* how many to skip past */ 292 uint32_t dbsi_copied; /* how many got copied back */ 293 uint32_t dbsi_left; /* remaining to copy */ 294 void * dbsi_buffer; /* region to copy disk_badsectors to */ 295 }; 296 297 #define DK_STRATEGYNAMELEN 32 298 struct disk_strategy { 299 char dks_name[DK_STRATEGYNAMELEN]; /* name of strategy */ 300 char *dks_param; /* notyet; should be NULL */ 301 size_t dks_paramlen; /* notyet; should be 0 */ 302 }; 303 304 /* Sector alignment */ 305 struct disk_sectoralign { 306 uint32_t dsa_firstaligned; /* first aligned sector # */ 307 uint32_t dsa_alignment; /* sectors per aligned sector */ 308 }; 309 310 #ifdef _KERNEL 311 #include <sys/device.h> 312 #include <sys/mutex.h> 313 314 #include <prop/proplib.h> 315 316 struct buf; 317 struct disk; 318 struct disklabel; 319 struct cpu_disklabel; 320 struct lwp; 321 struct vnode; 322 323 /* 324 * dkwedge_discovery_method: 325 * 326 * Structure used to describe partition map parsing schemes 327 * used for wedge autodiscovery. 328 */ 329 struct dkwedge_discovery_method { 330 /* link in wedge driver's list */ 331 LIST_ENTRY(dkwedge_discovery_method) ddm_list; 332 const char *ddm_name; /* name of this method */ 333 int ddm_priority; /* search priority */ 334 int (*ddm_discover)(struct disk *, struct vnode *); 335 }; 336 337 #define DKWEDGE_DISCOVERY_METHOD_DECL(name, prio, discover) \ 338 static struct dkwedge_discovery_method name ## _ddm = { \ 339 { NULL, NULL }, \ 340 #name, \ 341 prio, \ 342 discover \ 343 }; \ 344 __link_set_add_data(dkwedge_methods, name ## _ddm) 345 346 /* 347 * Disk partition dictionary. 348 * 349 * A partition is represented as a dictionary containing generic partition 350 * properties (such as starting block and block count), as well as information 351 * that is specific to individual partition map formats. 352 * 353 * <dict> 354 * <key>start-block</key> 355 * <integer>...</integer> 356 * <key>block-count</key> 357 * <integer>...</integer> 358 * <!-- DKW_PTYPE strings ("" or missing if unknown) --> 359 * <key>type</type> 360 * <string>...</string> 361 * <!-- optional --> 362 * <key>name</key> 363 * <string>...</string> 364 * 365 * <!-- these are valid for GPT partition maps --> 366 * <key>gpt-type-guid</key> 367 * <string>...</string> 368 * <key>gpt-partition-guid</key> 369 * <string>...</string> 370 * <key>gpt-platform-required</key> 371 * <false/> 372 * 373 * <!-- these are valid for 4.4BSD partition maps --> 374 * <key>bsd44-partition-type</key> 375 * <integer>...</integer> 376 * <key>bsd44-fs-fragment-size</key> 377 * <integer>...</integer> 378 * <key>bsd44-iso9660-session-offset</key> 379 * <integer>...</integer> 380 * <key>bsd44-ffs-cylinders-per-group</key> 381 * <integer>...</integer> 382 * <key>bsd44-lfs-segment-shift</key> 383 * <integer>...</integer> 384 * 385 * <!-- these are valid for NeXT partition maps --> 386 * <key>next-block-size</key> 387 * <integer>...</integer> 388 * <key>next-fs-fragment-size</key> 389 * <integer>...</integer> 390 * <key>next-fs-optimization</key> 391 * <string>...</string> <!-- "space" or "time" --> 392 * <key>next-fs-cylinders-per-group</key> 393 * <integer>...</integer> 394 * <key>next-bytes-per-inode-density</key> 395 * <integer>...</integer> 396 * <key>next-minfree-percentage</key> 397 * <integer>...</integer> 398 * <key>next-run-newfs-during-init</key> 399 * <false/> 400 * <key>next-mount-point</key> 401 * <string>...</string> 402 * <key>next-automount</key> 403 * <true/> 404 * <key>next-partition-type</key> 405 * <string>...</string> 406 * 407 * <!-- these are valid for MBR partition maps --> 408 * <key>mbr-start-head</key> 409 * <integer>...</integer> 410 * <key>mbr-start-sector</key> 411 * <integer>...</integer> 412 * <key>mbr-start-cylinder</key> 413 * <integer>...</integer> 414 * <key>mbr-partition-type</key> 415 * <integer>...</integer> 416 * <key>mbr-end-head</key> 417 * <integer>...</integer> 418 * <key>mbr-end-sector</key> 419 * <integer>...</integer> 420 * <key>mbr-end-cylinder</key> 421 * <integer>...</integer> 422 * <key>mbr-active-partition</key> 423 * <false/> 424 * 425 * <!-- these are valid for Apple partition maps --> 426 * <key>apple-partition-type</key> 427 * <string>...</string> 428 * <!-- XXX What else do we need? wrstuden? --> 429 * 430 * <!-- these are valid for RISCiX partition maps --> 431 * <key>riscix-partition-type</key> 432 * <integer>...</integer> 433 * 434 * <!-- these are valid for MIPS/SGI partition maps --> 435 * <key>mips-partition-type</key> 436 * <integer>...</integer> 437 * 438 * <!-- SunOS 4 partition maps have no specific 439 * additional information. Note, however, 440 * that SunOS 4 partitions must begin on 441 * cylinder boundaries. --> 442 * 443 * <!-- XXX Need Amiga partition map info --> 444 * 445 * <!-- these are valid for VTOC partition maps --> 446 * <key>vtoc-tag</key> 447 * <integer>...</integer> 448 * <key>vtoc-unmount</key> 449 * <false/> 450 * <key>vtoc-read-only</key> 451 * <false/> 452 * <!-- XXX is this really part of the partition info? --> 453 * <key>vtoc-timestamp</key> 454 * <integer>...</integer> 455 * 456 * <!-- mvme68k partition maps use 4.4BSD partition 457 * info stuffed into two different areas of the 458 * disk information label recognized by BUG. --> 459 * 460 * <!-- XXX What else? --> 461 * </dict> 462 */ 463 464 struct disk { 465 TAILQ_ENTRY(disk) dk_link; /* link in global disklist */ 466 const char *dk_name; /* disk name */ 467 prop_dictionary_t dk_info; /* reference to disk-info dictionary */ 468 struct disk_geom dk_geom; /* cooked version of dk_info */ 469 int dk_bopenmask; /* block devices open */ 470 int dk_copenmask; /* character devices open */ 471 int dk_openmask; /* composite (bopen|copen) */ 472 int dk_state; /* label state ### */ 473 int dk_blkshift; /* shift to convert DEV_BSIZE to blks */ 474 int dk_byteshift; /* shift to convert bytes to blks */ 475 476 /* 477 * Metrics data; note that some metrics may have no meaning 478 * on certain types of disks. 479 */ 480 struct io_stats *dk_stats; 481 482 const struct dkdriver *dk_driver; /* pointer to driver */ 483 484 /* 485 * Information required to be the parent of a disk wedge. 486 */ 487 kmutex_t dk_rawlock; /* lock on these fields */ 488 u_int dk_rawopens; /* # of openes of rawvp */ 489 struct vnode *dk_rawvp; /* vnode for the RAW_PART bdev */ 490 491 kmutex_t dk_openlock; /* lock on these and openmask */ 492 u_int dk_nwedges; /* # of configured wedges */ 493 /* all wedges on this disk */ 494 LIST_HEAD(, dkwedge_softc) dk_wedges; 495 496 /* 497 * Disk label information. Storage for the in-core disk label 498 * must be dynamically allocated, otherwise the size of this 499 * structure becomes machine-dependent. 500 */ 501 daddr_t dk_labelsector; /* sector containing label */ 502 struct disklabel *dk_label; /* label */ 503 struct cpu_disklabel *dk_cpulabel; 504 }; 505 506 struct dkdriver { 507 void (*d_strategy)(struct buf *); 508 void (*d_minphys)(struct buf *); 509 int (*d_open)(dev_t, int, int, struct lwp *); 510 int (*d_close)(dev_t, int, int, struct lwp *); 511 int (*d_diskstart)(device_t, struct buf *); 512 void (*d_iosize)(device_t, int *); 513 int (*d_dumpblocks)(device_t, void *, daddr_t, int); 514 int (*d_lastclose)(device_t); 515 int (*d_discard)(device_t, off_t, off_t); 516 int (*d_firstopen)(device_t, dev_t, int, int); 517 void (*d_label)(device_t, struct disklabel *lp); 518 }; 519 520 /* states */ 521 #define DK_CLOSED 0 /* drive is closed */ 522 #define DK_WANTOPEN 1 /* drive being opened */ 523 #define DK_WANTOPENRAW 2 /* drive being opened */ 524 #define DK_RDLABEL 3 /* label being read */ 525 #define DK_OPEN 4 /* label read, drive open */ 526 #define DK_OPENRAW 5 /* open without label */ 527 528 #define DK_BSIZE2BLKSHIFT(b) ((ffs((b) / DEV_BSIZE)) - 1) 529 #define DK_BSIZE2BYTESHIFT(b) (ffs((b)) - 1) 530 #define DK_DEV_BSIZE_OK(b) \ 531 ((b) >= DEV_BSIZE && ((b) & ((b) - 1)) == 0 && (b) <= MAXPHYS) 532 533 extern int disk_count; /* number of disks in global disklist */ 534 535 struct proc; 536 537 void disk_rename(struct disk *, const char *); 538 void disk_attach(struct disk *); 539 int disk_begindetach(struct disk *, int (*)(device_t), device_t, int); 540 void disk_detach(struct disk *); 541 void disk_init(struct disk *, const char *, const struct dkdriver *); 542 void disk_destroy(struct disk *); 543 void disk_wait(struct disk *); 544 void disk_busy(struct disk *); 545 void disk_unbusy(struct disk *, long, int); 546 bool disk_isbusy(struct disk *); 547 struct disk *disk_find(const char *); 548 int disk_ioctl(struct disk *, dev_t, u_long, void *, int, struct lwp *); 549 void disk_set_info(device_t, struct disk *, const char *); 550 551 void dkwedge_init(void); 552 int dkwedge_add(struct dkwedge_info *); 553 int dkwedge_del(struct dkwedge_info *); 554 void dkwedge_delall(struct disk *); 555 int dkwedge_list(struct disk *, struct dkwedge_list *, struct lwp *); 556 void dkwedge_discover(struct disk *); 557 int dkwedge_read(struct disk *, struct vnode *, daddr_t, void *, size_t); 558 device_t dkwedge_find_by_wname(const char *); 559 device_t dkwedge_find_by_parent(const char *, size_t *); 560 const char *dkwedge_get_parent_name(dev_t); 561 void dkwedge_print_wnames(void); 562 device_t dkwedge_find_partition(device_t, daddr_t, uint64_t); 563 564 #endif /* _KERNEL */ 565 566 #endif /* _SYS_DISK_H_ */
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