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