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