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 enum {
  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
  42 struct 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
  64 struct 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
  77 struct 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
  92 struct 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
 101 struct 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 */
 134 struct 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
 159 static 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
 171 static 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
 197 static 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
 205 static inline void free_disk_stats(struct gendisk *disk)
 206 {
 207         free_percpu(disk->dkstats);
 208 }
 209 #else   /* CONFIG_SMP */
 210 static inline int init_disk_stats(struct gendisk *disk)
 211 {
 212         return 1;
 213 }
 214
 215 static inline void free_disk_stats(struct gendisk *disk)
 216 {
 217 }
 218 #endif  /* CONFIG_SMP */
 219
 220 /* drivers/block/ll_rw_blk.c */
 221 extern void disk_round_stats(struct gendisk *disk);
 222
 223 /* drivers/block/genhd.c */
 224 extern int get_blkdev_list(char *, int);
 225 extern void add_disk(struct gendisk *disk);
 226 extern void del_gendisk(struct gendisk *gp);
 227 extern void unlink_gendisk(struct gendisk *gp);
 228 extern struct gendisk *get_gendisk(dev_t dev, int *part);
 229
 230 extern void set_device_ro(struct block_device *bdev, int flag);
 231 extern void set_disk_ro(struct gendisk *disk, int flag);
 232
 233 /* drivers/char/random.c */
 234 extern void add_disk_randomness(struct gendisk *disk);
 235 extern void rand_initialize_disk(struct gendisk *disk);
 236
 237 static inline sector_t get_start_sect(struct block_device *bdev)
 238 {
 239         return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
 240 }
 241 static inline sector_t get_capacity(struct gendisk *disk)
 242 {
 243         return disk->capacity;
 244 }
 245 static 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
 257 struct 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
 264 struct 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 */
 292 struct 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
 348 struct 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
 355 struct 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
 397 char *disk_name (struct gendisk *hd, int part, char *buf);
 398
 399 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
 400 extern void add_partition(struct gendisk *, int, sector_t, sector_t);
 401 extern void delete_partition(struct gendisk *, int);
 402
 403 extern struct gendisk *alloc_disk_node(int minors, int node_id);
 404 extern struct gendisk *alloc_disk(int minors);
 405 extern struct kobject *get_disk(struct gendisk *disk);
 406 extern void put_disk(struct gendisk *disk);
 407
 408 extern 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);
 413 extern void blk_unregister_region(dev_t dev, unsigned long range);
 414
 415 static 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