include/linux/genhd.h

   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
  14 #ifdef CONFIG_BLOCK
  15
  16 enum {
  17 /* These three have identical behaviour; use the second one if DOS FDISK gets
  18    confused about extended/logical partitions starting past cylinder 1023. */
  19         DOS_EXTENDED_PARTITION = 5,
  20         LINUX_EXTENDED_PARTITION = 0x85,
  21         WIN98_EXTENDED_PARTITION = 0x0f,
  22
  23         SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
  24
  25         LINUX_SWAP_PARTITION = 0x82,
  26         LINUX_DATA_PARTITION = 0x83,
  27         LINUX_LVM_PARTITION = 0x8e,
  28         LINUX_RAID_PARTITION = 0xfd,    /* autodetect RAID partition */
  29
  30         SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
  31         NEW_SOLARIS_X86_PARTITION = 0xbf,
  32
  33         DM6_AUX1PARTITION = 0x51,       /* no DDO:  use xlated geom */
  34         DM6_AUX3PARTITION = 0x53,       /* no DDO:  use xlated geom */
  35         DM6_PARTITION = 0x54,           /* has DDO: use xlated geom & offset */
  36         EZD_PARTITION = 0x55,           /* EZ-DRIVE */
  37
  38         FREEBSD_PARTITION = 0xa5,       /* FreeBSD Partition ID */
  39         OPENBSD_PARTITION = 0xa6,       /* OpenBSD Partition ID */
  40         NETBSD_PARTITION = 0xa9,        /* NetBSD Partition ID */
  41         BSDI_PARTITION = 0xb7,          /* BSDI Partition ID */
  42         MINIX_PARTITION = 0x81,         /* Minix Partition ID */
  43         UNIXWARE_PARTITION = 0x63,      /* Same as GNU_HURD and SCO Unix */
  44 };
  45
  46 #ifndef __KERNEL__
  47
  48 struct partition {
  49         unsigned char boot_ind;         /* 0x80 - active */
  50         unsigned char head;             /* starting head */
  51         unsigned char sector;           /* starting sector */
  52         unsigned char cyl;              /* starting cylinder */
  53         unsigned char sys_ind;          /* What partition type */
  54         unsigned char end_head;         /* end head */
  55         unsigned char end_sector;       /* end sector */
  56         unsigned char end_cyl;          /* end cylinder */
  57         unsigned int start_sect;        /* starting sector counting from 0 */
  58         unsigned int nr_sects;          /* nr of sectors in partition */
  59 } __attribute__((packed));
  60
  61 #endif
  62
  63 #ifdef __KERNEL__
  64 #include <linux/major.h>
  65 #include <linux/device.h>
  66 #include <linux/smp.h>
  67 #include <linux/string.h>
  68 #include <linux/fs.h>
  69
  70 struct partition {
  71         unsigned char boot_ind;         /* 0x80 - active */
  72         unsigned char head;             /* starting head */
  73         unsigned char sector;           /* starting sector */
  74         unsigned char cyl;              /* starting cylinder */
  75         unsigned char sys_ind;          /* What partition type */
  76         unsigned char end_head;         /* end head */
  77         unsigned char end_sector;       /* end sector */
  78         unsigned char end_cyl;          /* end cylinder */
  79         __le32 start_sect;      /* starting sector counting from 0 */
  80         __le32 nr_sects;                /* nr of sectors in partition */
  81 } __attribute__((packed));
  82
  83 struct hd_struct {
  84         sector_t start_sect;
  85         sector_t nr_sects;
  86         struct kobject kobj;
  87         struct kobject *holder_dir;
  88         unsigned ios[2], sectors[2];    /* READs and WRITEs */
  89         int policy, partno;
  90 #ifdef CONFIG_FAIL_MAKE_REQUEST
  91         int make_it_fail;
  92 #endif
  93 };
  94
  95 #define GENHD_FL_REMOVABLE                      1
  96 #define GENHD_FL_DRIVERFS                       2
  97 #define GENHD_FL_CD                             8
  98 #define GENHD_FL_UP                             16
  99 #define GENHD_FL_SUPPRESS_PARTITION_INFO        32
 100 #define GENHD_FL_FAIL                           64
 101
 102 struct disk_stats {
 103         unsigned long sectors[2];       /* READs and WRITEs */
 104         unsigned long ios[2];
 105         unsigned long merges[2];
 106         unsigned long ticks[2];
 107         unsigned long io_ticks;
 108         unsigned long time_in_queue;
 109 };
 110
 111 struct gendisk {
 112         int major;                      /* major number of driver */
 113         int first_minor;
 114         int minors;                     /* maximum number of minors, =1 for
 115                                          * disks that can't be partitioned. */
 116         char disk_name[32];             /* name of major driver */
 117         struct hd_struct **part;        /* [indexed by minor] */
 118         int part_uevent_suppress;
 119         struct block_device_operations *fops;
 120         struct request_queue *queue;
 121         void *private_data;
 122         sector_t capacity;
 123
 124         int flags;
 125         struct device *driverfs_dev;
 126         struct kobject kobj;
 127         struct kobject *holder_dir;
 128         struct kobject *slave_dir;
 129
 130         struct timer_rand_state *random;
 131         int policy;
 132
 133         atomic_t sync_io;               /* RAID */
 134         unsigned long stamp;
 135         int in_flight;
 136 #ifdef  CONFIG_SMP
 137         struct disk_stats *dkstats;
 138 #else
 139         struct disk_stats dkstats;
 140 #endif
 141 };
 142
 143 /* Structure for sysfs attributes on block devices */
 144 struct disk_attribute {
 145         struct attribute attr;
 146         ssize_t (*show)(struct gendisk *, char *);
 147         ssize_t (*store)(struct gendisk *, const char *, size_t);
 148 };
 149
 150 /*
 151  * Macros to operate on percpu disk statistics:
 152  *
 153  * The __ variants should only be called in critical sections. The full
 154  * variants disable/enable preemption.
 155  */
 156 #ifdef  CONFIG_SMP
 157 #define __disk_stat_add(gendiskp, field, addnd)         \
 158         (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
 159
 160 #define disk_stat_read(gendiskp, field)                                 \
 161 ({                                                                      \
 162         typeof(gendiskp->dkstats->field) res = 0;                       \
 163         int i;                                                          \
 164         for_each_possible_cpu(i)                                        \
 165                 res += per_cpu_ptr(gendiskp->dkstats, i)->field;        \
 166         res;                                                            \
 167 })
 168
 169 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)       {
 170         int i;
 171         for_each_possible_cpu(i)
 172                 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
 173                                 sizeof (struct disk_stats));
 174 }
 175
 176 #else
 177 #define __disk_stat_add(gendiskp, field, addnd) \
 178                                 (gendiskp->dkstats.field += addnd)
 179 #define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
 180
 181 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)       {
 182         memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
 183 }
 184 #endif
 185
 186 #define disk_stat_add(gendiskp, field, addnd)                   \
 187         do {                                                    \
 188                 preempt_disable();                              \
 189                 __disk_stat_add(gendiskp, field, addnd);        \
 190                 preempt_enable();                               \
 191         } while (0)
 192
 193 #define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
 194 #define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
 195
 196 #define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
 197 #define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
 198
 199 #define __disk_stat_sub(gendiskp, field, subnd) \
 200                 __disk_stat_add(gendiskp, field, -subnd)
 201 #define disk_stat_sub(gendiskp, field, subnd) \
 202                 disk_stat_add(gendiskp, field, -subnd)
 203
 204
 205 /* Inlines to alloc and free disk stats in struct gendisk */
 206 #ifdef  CONFIG_SMP
 207 static inline int init_disk_stats(struct gendisk *disk)
 208 {
 209         disk->dkstats = alloc_percpu(struct disk_stats);
 210         if (!disk->dkstats)
 211                 return 0;
 212         return 1;
 213 }
 214
 215 static inline void free_disk_stats(struct gendisk *disk)
 216 {
 217         free_percpu(disk->dkstats);
 218 }
 219 #else   /* CONFIG_SMP */
 220 static inline int init_disk_stats(struct gendisk *disk)
 221 {
 222         return 1;
 223 }
 224
 225 static inline void free_disk_stats(struct gendisk *disk)
 226 {
 227 }
 228 #endif  /* CONFIG_SMP */
 229
 230 /* drivers/block/ll_rw_blk.c */
 231 extern void disk_round_stats(struct gendisk *disk);
 232
 233 /* drivers/block/genhd.c */
 234 extern int get_blkdev_list(char *, int);
 235 extern void add_disk(struct gendisk *disk);
 236 extern void del_gendisk(struct gendisk *gp);
 237 extern void unlink_gendisk(struct gendisk *gp);
 238 extern struct gendisk *get_gendisk(dev_t dev, int *part);
 239
 240 extern void set_device_ro(struct block_device *bdev, int flag);
 241 extern void set_disk_ro(struct gendisk *disk, int flag);
 242
 243 /* drivers/char/random.c */
 244 extern void add_disk_randomness(struct gendisk *disk);
 245 extern void rand_initialize_disk(struct gendisk *disk);
 246
 247 static inline sector_t get_start_sect(struct block_device *bdev)
 248 {
 249         return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
 250 }
 251 static inline sector_t get_capacity(struct gendisk *disk)
 252 {
 253         return disk->capacity;
 254 }
 255 static inline void set_capacity(struct gendisk *disk, sector_t size)
 256 {
 257         disk->capacity = size;
 258 }
 259
 260 #endif  /*  __KERNEL__  */
 261
 262 #ifdef CONFIG_SOLARIS_X86_PARTITION
 263
 264 #define SOLARIS_X86_NUMSLICE    8
 265 #define SOLARIS_X86_VTOC_SANE   (0x600DDEEEUL)
 266
 267 struct solaris_x86_slice {
 268         __le16 s_tag;           /* ID tag of partition */
 269         __le16 s_flag;          /* permission flags */
 270         __le32 s_start;         /* start sector no of partition */
 271         __le32 s_size;          /* # of blocks in partition */
 272 };
 273
 274 struct solaris_x86_vtoc {
 275         unsigned int v_bootinfo[3];     /* info needed by mboot (unsupported) */
 276         __le32 v_sanity;                /* to verify vtoc sanity */
 277         __le32 v_version;               /* layout version */
 278         char    v_volume[8];            /* volume name */
 279         __le16  v_sectorsz;             /* sector size in bytes */
 280         __le16  v_nparts;               /* number of partitions */
 281         unsigned int v_reserved[10];    /* free space */
 282         struct solaris_x86_slice
 283                 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
 284         unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
 285         char    v_asciilabel[128];      /* for compatibility */
 286 };
 287
 288 #endif /* CONFIG_SOLARIS_X86_PARTITION */
 289
 290 #ifdef CONFIG_BSD_DISKLABEL
 291 /*
 292  * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
 293  * updated by Marc Espie <Marc.Espie@openbsd.org>
 294  */
 295
 296 /* check against BSD src/sys/sys/disklabel.h for consistency */
 297
 298 #define BSD_DISKMAGIC   (0x82564557UL)  /* The disk magic number */
 299 #define BSD_MAXPARTITIONS       16
 300 #define OPENBSD_MAXPARTITIONS   16
 301 #define BSD_FS_UNUSED           0       /* disklabel unused partition entry ID */
 302 struct bsd_disklabel {
 303         __le32  d_magic;                /* the magic number */
 304         __s16   d_type;                 /* drive type */
 305         __s16   d_subtype;              /* controller/d_type specific */
 306         char    d_typename[16];         /* type name, e.g. "eagle" */
 307         char    d_packname[16];                 /* pack identifier */
 308         __u32   d_secsize;              /* # of bytes per sector */
 309         __u32   d_nsectors;             /* # of data sectors per track */
 310         __u32   d_ntracks;              /* # of tracks per cylinder */
 311         __u32   d_ncylinders;           /* # of data cylinders per unit */
 312         __u32   d_secpercyl;            /* # of data sectors per cylinder */
 313         __u32   d_secperunit;           /* # of data sectors per unit */
 314         __u16   d_sparespertrack;       /* # of spare sectors per track */
 315         __u16   d_sparespercyl;         /* # of spare sectors per cylinder */
 316         __u32   d_acylinders;           /* # of alt. cylinders per unit */
 317         __u16   d_rpm;                  /* rotational speed */
 318         __u16   d_interleave;           /* hardware sector interleave */
 319         __u16   d_trackskew;            /* sector 0 skew, per track */
 320         __u16   d_cylskew;              /* sector 0 skew, per cylinder */
 321         __u32   d_headswitch;           /* head switch time, usec */
 322         __u32   d_trkseek;              /* track-to-track seek, usec */
 323         __u32   d_flags;                /* generic flags */
 324 #define NDDATA 5
 325         __u32   d_drivedata[NDDATA];    /* drive-type specific information */
 326 #define NSPARE 5
 327         __u32   d_spare[NSPARE];        /* reserved for future use */
 328         __le32  d_magic2;               /* the magic number (again) */
 329         __le16  d_checksum;             /* xor of data incl. partitions */
 330
 331                         /* filesystem and partition information: */
 332         __le16  d_npartitions;          /* number of partitions in following */
 333         __le32  d_bbsize;               /* size of boot area at sn0, bytes */
 334         __le32  d_sbsize;               /* max size of fs superblock, bytes */
 335         struct  bsd_partition {         /* the partition table */
 336                 __le32  p_size;         /* number of sectors in partition */
 337                 __le32  p_offset;       /* starting sector */
 338                 __le32  p_fsize;        /* filesystem basic fragment size */
 339                 __u8    p_fstype;       /* filesystem type, see below */
 340                 __u8    p_frag;         /* filesystem fragments per block */
 341                 __le16  p_cpg;          /* filesystem cylinders per group */
 342         } d_partitions[BSD_MAXPARTITIONS];      /* actually may be more */
 343 };
 344
 345 #endif  /* CONFIG_BSD_DISKLABEL */
 346
 347 #ifdef CONFIG_UNIXWARE_DISKLABEL
 348 /*
 349  * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
 350  * and Krzysztof G. Baranowski <kgb@knm.org.pl>
 351  */
 352
 353 #define UNIXWARE_DISKMAGIC     (0xCA5E600DUL)   /* The disk magic number */
 354 #define UNIXWARE_DISKMAGIC2    (0x600DDEEEUL)   /* The slice table magic nr */
 355 #define UNIXWARE_NUMSLICE      16
 356 #define UNIXWARE_FS_UNUSED     0                /* Unused slice entry ID */
 357
 358 struct unixware_slice {
 359         __le16   s_label;       /* label */
 360         __le16   s_flags;       /* permission flags */
 361         __le32   start_sect;    /* starting sector */
 362         __le32   nr_sects;      /* number of sectors in slice */
 363 };
 364
 365 struct unixware_disklabel {
 366         __le32   d_type;                /* drive type */
 367         __le32   d_magic;                /* the magic number */
 368         __le32   d_version;              /* version number */
 369         char    d_serial[12];           /* serial number of the device */
 370         __le32   d_ncylinders;           /* # of data cylinders per device */
 371         __le32   d_ntracks;              /* # of tracks per cylinder */
 372         __le32   d_nsectors;             /* # of data sectors per track */
 373         __le32   d_secsize;              /* # of bytes per sector */
 374         __le32   d_part_start;           /* # of first sector of this partition */
 375         __le32   d_unknown1[12];         /* ? */
 376         __le32  d_alt_tbl;              /* byte offset of alternate table */
 377         __le32  d_alt_len;              /* byte length of alternate table */
 378         __le32  d_phys_cyl;             /* # of physical cylinders per device */
 379         __le32  d_phys_trk;             /* # of physical tracks per cylinder */
 380         __le32  d_phys_sec;             /* # of physical sectors per track */
 381         __le32  d_phys_bytes;           /* # of physical bytes per sector */
 382         __le32  d_unknown2;             /* ? */
 383         __le32   d_unknown3;             /* ? */
 384         __le32  d_pad[8];               /* pad */
 385
 386         struct unixware_vtoc {
 387                 __le32  v_magic;                /* the magic number */
 388                 __le32  v_version;              /* version number */
 389                 char    v_name[8];              /* volume name */
 390                 __le16  v_nslices;              /* # of slices */
 391                 __le16  v_unknown1;             /* ? */
 392                 __le32  v_reserved[10];         /* reserved */
 393                 struct unixware_slice
 394                         v_slice[UNIXWARE_NUMSLICE];     /* slice headers */
 395         } vtoc;
 396
 397 };  /* 408 */
 398
 399 #endif /* CONFIG_UNIXWARE_DISKLABEL */
 400
 401 #ifdef CONFIG_MINIX_SUBPARTITION
 402 #   define MINIX_NR_SUBPARTITIONS  4
 403 #endif /* CONFIG_MINIX_SUBPARTITION */
 404
 405 #ifdef __KERNEL__
 406
 407 #define ADDPART_FLAG_NONE       0
 408 #define ADDPART_FLAG_RAID       1
 409 #define ADDPART_FLAG_WHOLEDISK  2
 410
 411 char *disk_name (struct gendisk *hd, int part, char *buf);
 412
 413 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
 414 extern void add_partition(struct gendisk *, int, sector_t, sector_t, int);
 415 extern void delete_partition(struct gendisk *, int);
 416
 417 extern struct gendisk *alloc_disk_node(int minors, int node_id);
 418 extern struct gendisk *alloc_disk(int minors);
 419 extern struct kobject *get_disk(struct gendisk *disk);
 420 extern void put_disk(struct gendisk *disk);
 421
 422 extern void blk_register_region(dev_t dev, unsigned long range,
 423                         struct module *module,
 424                         struct kobject *(*probe)(dev_t, int *, void *),
 425                         int (*lock)(dev_t, void *),
 426                         void *data);
 427 extern void blk_unregister_region(dev_t dev, unsigned long range);
 428
 429 static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
 430 {
 431         return bdget(MKDEV(disk->major, disk->first_minor) + index);
 432 }
 433
 434 #endif
 435
 436 #endif
 437
 438 #endif