1#ifndef _LINUX_GENHD_H 2#define _LINUX_GENHD_H 3 4/* 5 * genhd.h Copyright (C) 1992 Drew Eckhardt 6 * Generic hard disk header file by 7 * Drew Eckhardt 8 * 9 * <drew@colorado.edu> 10 */ 11 12#include <linux/types.h> 13 14enum { 15/* These three have identical behaviour; use the second one if DOS FDISK gets 16 confused about extended/logical partitions starting past cylinder 1023. */ 17 DOS_EXTENDED_PARTITION = 5, 18 LINUX_EXTENDED_PARTITION = 0x85, 19 WIN98_EXTENDED_PARTITION = 0x0f, 20 21 LINUX_SWAP_PARTITION = 0x82, 22 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */ 23 24 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION, 25 NEW_SOLARIS_X86_PARTITION = 0xbf, 26 27 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */ 28 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */ 29 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */ 30 EZD_PARTITION = 0x55, /* EZ-DRIVE */ 31 32 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */ 33 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */ 34 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */ 35 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */ 36 MINIX_PARTITION = 0x81, /* Minix Partition ID */ 37 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */ 38}; 39 40#ifndef __KERNEL__ 41 42struct partition { 43 unsigned char boot_ind; /* 0x80 - active */ 44 unsigned char head; /* starting head */ 45 unsigned char sector; /* starting sector */ 46 unsigned char cyl; /* starting cylinder */ 47 unsigned char sys_ind; /* What partition type */ 48 unsigned char end_head; /* end head */ 49 unsigned char end_sector; /* end sector */ 50 unsigned char end_cyl; /* end cylinder */ 51 unsigned int start_sect; /* starting sector counting from 0 */ 52 unsigned int nr_sects; /* nr of sectors in partition */ 53} __attribute__((packed)); 54 55#endif 56 57#ifdef __KERNEL__ 58#include <linux/major.h> 59#include <linux/device.h> 60#include <linux/smp.h> 61#include <linux/string.h> 62#include <linux/fs.h> 63 64struct partition { 65 unsigned char boot_ind; /* 0x80 - active */ 66 unsigned char head; /* starting head */ 67 unsigned char sector; /* starting sector */ 68 unsigned char cyl; /* starting cylinder */ 69 unsigned char sys_ind; /* What partition type */ 70 unsigned char end_head; /* end head */ 71 unsigned char end_sector; /* end sector */ 72 unsigned char end_cyl; /* end cylinder */ 73 __le32 start_sect; /* starting sector counting from 0 */ 74 __le32 nr_sects; /* nr of sectors in partition */ 75} __attribute__((packed)); 76 77struct hd_struct { 78 sector_t start_sect; 79 sector_t nr_sects; 80 struct kobject kobj; 81 struct kobject *holder_dir; 82 unsigned ios[2], sectors[2]; /* READs and WRITEs */ 83 int policy, partno; 84}; 85 86#define GENHD_FL_REMOVABLE 1 87#define GENHD_FL_DRIVERFS 2 88#define GENHD_FL_CD 8 89#define GENHD_FL_UP 16 90#define GENHD_FL_SUPPRESS_PARTITION_INFO 32 91 92struct disk_stats { 93 unsigned long sectors[2]; /* READs and WRITEs */ 94 unsigned long ios[2]; 95 unsigned long merges[2]; 96 unsigned long ticks[2]; 97 unsigned long io_ticks; 98 unsigned long time_in_queue; 99}; 100 101struct gendisk { 102 int major; /* major number of driver */ 103 int first_minor; 104 int minors; /* maximum number of minors, =1 for 105 * disks that can't be partitioned. */ 106 char disk_name[32]; /* name of major driver */ 107 struct hd_struct **part; /* [indexed by minor] */ 108 int part_uevent_suppress; 109 struct block_device_operations *fops; 110 struct request_queue *queue; 111 void *private_data; 112 sector_t capacity; 113 114 int flags; 115 struct device *driverfs_dev; 116 struct kobject kobj; 117 struct kobject *holder_dir; 118 struct kobject *slave_dir; 119 120 struct timer_rand_state *random; 121 int policy; 122 123 atomic_t sync_io; /* RAID */ 124 unsigned long stamp; 125 int in_flight; 126#ifdef CONFIG_SMP 127 struct disk_stats *dkstats; 128#else 129 struct disk_stats dkstats; 130#endif 131}; 132 133/* Structure for sysfs attributes on block devices */ 134struct disk_attribute { 135 struct attribute attr; 136 ssize_t (*show)(struct gendisk *, char *); 137 ssize_t (*store)(struct gendisk *, const char *, size_t); 138}; 139 140/* 141 * Macros to operate on percpu disk statistics: 142 * 143 * The __ variants should only be called in critical sections. The full 144 * variants disable/enable preemption. 145 */ 146#ifdef CONFIG_SMP 147#define __disk_stat_add(gendiskp, field, addnd) \ 148 (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd) 149 150#define disk_stat_read(gendiskp, field) \ 151({ \ 152 typeof(gendiskp->dkstats->field) res = 0; \ 153 int i; \ 154 for_each_possible_cpu(i) \ 155 res += per_cpu_ptr(gendiskp->dkstats, i)->field; \ 156 res; \ 157}) 158 159static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) { 160 int i; 161 for_each_possible_cpu(i) 162 memset(per_cpu_ptr(gendiskp->dkstats, i), value, 163 sizeof (struct disk_stats)); 164} 165 166#else 167#define __disk_stat_add(gendiskp, field, addnd) \ 168 (gendiskp->dkstats.field += addnd) 169#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field) 170 171static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) { 172 memset(&gendiskp->dkstats, value, sizeof (struct disk_stats)); 173} 174#endif 175 176#define disk_stat_add(gendiskp, field, addnd) \ 177 do { \ 178 preempt_disable(); \ 179 __disk_stat_add(gendiskp, field, addnd); \ 180 preempt_enable(); \ 181 } while (0) 182 183#define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1) 184#define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1) 185 186#define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1) 187#define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1) 188 189#define __disk_stat_sub(gendiskp, field, subnd) \ 190 __disk_stat_add(gendiskp, field, -subnd) 191#define disk_stat_sub(gendiskp, field, subnd) \ 192 disk_stat_add(gendiskp, field, -subnd) 193 194 195/* Inlines to alloc and free disk stats in struct gendisk */ 196#ifdef CONFIG_SMP 197static inline int init_disk_stats(struct gendisk *disk) 198{ 199 disk->dkstats = alloc_percpu(struct disk_stats); 200 if (!disk->dkstats) 201 return 0; 202 return 1; 203} 204 205static inline void free_disk_stats(struct gendisk *disk) 206{ 207 free_percpu(disk->dkstats); 208} 209#else /* CONFIG_SMP */ 210static inline int init_disk_stats(struct gendisk *disk) 211{ 212 return 1; 213} 214 215static inline void free_disk_stats(struct gendisk *disk) 216{ 217} 218#endif /* CONFIG_SMP */ 219 220/* drivers/block/ll_rw_blk.c */ 221extern void disk_round_stats(struct gendisk *disk); 222 223/* drivers/block/genhd.c */ 224extern int get_blkdev_list(char *, int); 225extern void add_disk(struct gendisk *disk); 226extern void del_gendisk(struct gendisk *gp); 227extern void unlink_gendisk(struct gendisk *gp); 228extern struct gendisk *get_gendisk(dev_t dev, int *part); 229 230extern void set_device_ro(struct block_device *bdev, int flag); 231extern void set_disk_ro(struct gendisk *disk, int flag); 232 233/* drivers/char/random.c */ 234extern void add_disk_randomness(struct gendisk *disk); 235extern void rand_initialize_disk(struct gendisk *disk); 236 237static inline sector_t get_start_sect(struct block_device *bdev) 238{ 239 return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect; 240} 241static inline sector_t get_capacity(struct gendisk *disk) 242{ 243 return disk->capacity; 244} 245static inline void set_capacity(struct gendisk *disk, sector_t size) 246{ 247 disk->capacity = size; 248} 249 250#endif /* __KERNEL__ */ 251 252#ifdef CONFIG_SOLARIS_X86_PARTITION 253 254#define SOLARIS_X86_NUMSLICE 8 255#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL) 256 257struct solaris_x86_slice { 258 __le16 s_tag; /* ID tag of partition */ 259 __le16 s_flag; /* permission flags */ 260 __le32 s_start; /* start sector no of partition */ 261 __le32 s_size; /* # of blocks in partition */ 262}; 263 264struct solaris_x86_vtoc { 265 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */ 266 __le32 v_sanity; /* to verify vtoc sanity */ 267 __le32 v_version; /* layout version */ 268 char v_volume[8]; /* volume name */ 269 __le16 v_sectorsz; /* sector size in bytes */ 270 __le16 v_nparts; /* number of partitions */ 271 unsigned int v_reserved[10]; /* free space */ 272 struct solaris_x86_slice 273 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */ 274 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */ 275 char v_asciilabel[128]; /* for compatibility */ 276}; 277 278#endif /* CONFIG_SOLARIS_X86_PARTITION */ 279 280#ifdef CONFIG_BSD_DISKLABEL 281/* 282 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il> 283 * updated by Marc Espie <Marc.Espie@openbsd.org> 284 */ 285 286/* check against BSD src/sys/sys/disklabel.h for consistency */ 287 288#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */ 289#define BSD_MAXPARTITIONS 16 290#define OPENBSD_MAXPARTITIONS 16 291#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */ 292struct bsd_disklabel { 293 __le32 d_magic; /* the magic number */ 294 __s16 d_type; /* drive type */ 295 __s16 d_subtype; /* controller/d_type specific */ 296 char d_typename[16]; /* type name, e.g. "eagle" */ 297 char d_packname[16]; /* pack identifier */ 298 __u32 d_secsize; /* # of bytes per sector */ 299 __u32 d_nsectors; /* # of data sectors per track */ 300 __u32 d_ntracks; /* # of tracks per cylinder */ 301 __u32 d_ncylinders; /* # of data cylinders per unit */ 302 __u32 d_secpercyl; /* # of data sectors per cylinder */ 303 __u32 d_secperunit; /* # of data sectors per unit */ 304 __u16 d_sparespertrack; /* # of spare sectors per track */ 305 __u16 d_sparespercyl; /* # of spare sectors per cylinder */ 306 __u32 d_acylinders; /* # of alt. cylinders per unit */ 307 __u16 d_rpm; /* rotational speed */ 308 __u16 d_interleave; /* hardware sector interleave */ 309 __u16 d_trackskew; /* sector 0 skew, per track */ 310 __u16 d_cylskew; /* sector 0 skew, per cylinder */ 311 __u32 d_headswitch; /* head switch time, usec */ 312 __u32 d_trkseek; /* track-to-track seek, usec */ 313 __u32 d_flags; /* generic flags */ 314#define NDDATA 5 315 __u32 d_drivedata[NDDATA]; /* drive-type specific information */ 316#define NSPARE 5 317 __u32 d_spare[NSPARE]; /* reserved for future use */ 318 __le32 d_magic2; /* the magic number (again) */ 319 __le16 d_checksum; /* xor of data incl. partitions */ 320 321 /* filesystem and partition information: */ 322 __le16 d_npartitions; /* number of partitions in following */ 323 __le32 d_bbsize; /* size of boot area at sn0, bytes */ 324 __le32 d_sbsize; /* max size of fs superblock, bytes */ 325 struct bsd_partition { /* the partition table */ 326 __le32 p_size; /* number of sectors in partition */ 327 __le32 p_offset; /* starting sector */ 328 __le32 p_fsize; /* filesystem basic fragment size */ 329 __u8 p_fstype; /* filesystem type, see below */ 330 __u8 p_frag; /* filesystem fragments per block */ 331 __le16 p_cpg; /* filesystem cylinders per group */ 332 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */ 333}; 334 335#endif /* CONFIG_BSD_DISKLABEL */ 336 337#ifdef CONFIG_UNIXWARE_DISKLABEL 338/* 339 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl> 340 * and Krzysztof G. Baranowski <kgb@knm.org.pl> 341 */ 342 343#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */ 344#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */ 345#define UNIXWARE_NUMSLICE 16 346#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */ 347 348struct unixware_slice { 349 __le16 s_label; /* label */ 350 __le16 s_flags; /* permission flags */ 351 __le32 start_sect; /* starting sector */ 352 __le32 nr_sects; /* number of sectors in slice */ 353}; 354 355struct unixware_disklabel { 356 __le32 d_type; /* drive type */ 357 __le32 d_magic; /* the magic number */ 358 __le32 d_version; /* version number */ 359 char d_serial[12]; /* serial number of the device */ 360 __le32 d_ncylinders; /* # of data cylinders per device */ 361 __le32 d_ntracks; /* # of tracks per cylinder */ 362 __le32 d_nsectors; /* # of data sectors per track */ 363 __le32 d_secsize; /* # of bytes per sector */ 364 __le32 d_part_start; /* # of first sector of this partition */ 365 __le32 d_unknown1[12]; /* ? */ 366 __le32 d_alt_tbl; /* byte offset of alternate table */ 367 __le32 d_alt_len; /* byte length of alternate table */ 368 __le32 d_phys_cyl; /* # of physical cylinders per device */ 369 __le32 d_phys_trk; /* # of physical tracks per cylinder */ 370 __le32 d_phys_sec; /* # of physical sectors per track */ 371 __le32 d_phys_bytes; /* # of physical bytes per sector */ 372 __le32 d_unknown2; /* ? */ 373 __le32 d_unknown3; /* ? */ 374 __le32 d_pad[8]; /* pad */ 375 376 struct unixware_vtoc { 377 __le32 v_magic; /* the magic number */ 378 __le32 v_version; /* version number */ 379 char v_name[8]; /* volume name */ 380 __le16 v_nslices; /* # of slices */ 381 __le16 v_unknown1; /* ? */ 382 __le32 v_reserved[10]; /* reserved */ 383 struct unixware_slice 384 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */ 385 } vtoc; 386 387}; /* 408 */ 388 389#endif /* CONFIG_UNIXWARE_DISKLABEL */ 390 391#ifdef CONFIG_MINIX_SUBPARTITION 392# define MINIX_NR_SUBPARTITIONS 4 393#endif /* CONFIG_MINIX_SUBPARTITION */ 394 395#ifdef __KERNEL__ 396 397char *disk_name (struct gendisk *hd, int part, char *buf); 398 399extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev); 400extern void add_partition(struct gendisk *, int, sector_t, sector_t); 401extern void delete_partition(struct gendisk *, int); 402 403extern struct gendisk *alloc_disk_node(int minors, int node_id); 404extern struct gendisk *alloc_disk(int minors); 405extern struct kobject *get_disk(struct gendisk *disk); 406extern void put_disk(struct gendisk *disk); 407 408extern void blk_register_region(dev_t dev, unsigned long range, 409 struct module *module, 410 struct kobject *(*probe)(dev_t, int *, void *), 411 int (*lock)(dev_t, void *), 412 void *data); 413extern void blk_unregister_region(dev_t dev, unsigned long range); 414 415static inline struct block_device *bdget_disk(struct gendisk *disk, int index) 416{ 417 return bdget(MKDEV(disk->major, disk->first_minor) + index); 418} 419 420#endif 421 422#endif 423