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 #include <linux/workqueue.h>
  70
  71 struct partition {
  72         unsigned char boot_ind;         /* 0x80 - active */
  73         unsigned char head;             /* starting head */
  74         unsigned char sector;           /* starting sector */
  75         unsigned char cyl;              /* starting cylinder */
  76         unsigned char sys_ind;          /* What partition type */
  77         unsigned char end_head;         /* end head */
  78         unsigned char end_sector;       /* end sector */
  79         unsigned char end_cyl;          /* end cylinder */
  80         __le32 start_sect;      /* starting sector counting from 0 */
  81         __le32 nr_sects;                /* nr of sectors in partition */
  82 } __attribute__((packed));
  83
  84 struct hd_struct {
  85         sector_t start_sect;
  86         sector_t nr_sects;
  87         struct kobject kobj;
  88         struct kobject *holder_dir;
  89         unsigned ios[2], sectors[2];    /* READs and WRITEs */
  90         int policy, partno;
  91 #ifdef CONFIG_FAIL_MAKE_REQUEST
  92         int make_it_fail;
  93 #endif
  94 };
  95
  96 #define GENHD_FL_REMOVABLE                      1
  97 #define GENHD_FL_DRIVERFS                       2
  98 #define GENHD_FL_MEDIA_CHANGE_NOTIFY            4
  99 #define GENHD_FL_CD                             8
 100 #define GENHD_FL_UP                             16
 101 #define GENHD_FL_SUPPRESS_PARTITION_INFO        32
 102 #define GENHD_FL_FAIL                           64
 103
 104 struct disk_stats {
 105         unsigned long sectors[2];       /* READs and WRITEs */
 106         unsigned long ios[2];
 107         unsigned long merges[2];
 108         unsigned long ticks[2];
 109         unsigned long io_ticks;
 110         unsigned long time_in_queue;
 111 };
 112
 113 struct gendisk {
 114         int major;                      /* major number of driver */
 115         int first_minor;
 116         int minors;                     /* maximum number of minors, =1 for
 117                                          * disks that can't be partitioned. */
 118         char disk_name[32];             /* name of major driver */
 119         struct hd_struct **part;        /* [indexed by minor] */
 120         int part_uevent_suppress;
 121         struct block_device_operations *fops;
 122         struct request_queue *queue;
 123         void *private_data;
 124         sector_t capacity;
 125
 126         int flags;
 127         struct device *driverfs_dev;
 128         struct kobject kobj;
 129         struct kobject *holder_dir;
 130         struct kobject *slave_dir;
 131
 132         struct timer_rand_state *random;
 133         int policy;
 134
 135         atomic_t sync_io;               /* RAID */
 136         unsigned long stamp;
 137         int in_flight;
 138 #ifdef  CONFIG_SMP
 139         struct disk_stats *dkstats;
 140 #else
 141         struct disk_stats dkstats;
 142 #endif
 143         struct work_struct async_notify;
 144 };
 145
 146 /* Structure for sysfs attributes on block devices */
 147 struct disk_attribute {
 148         struct attribute attr;
 149         ssize_t (*show)(struct gendisk *, char *);
 150         ssize_t (*store)(struct gendisk *, const char *, size_t);
 151 };
 152
 153 /*
 154  * Macros to operate on percpu disk statistics:
 155  *
 156  * The __ variants should only be called in critical sections. The full
 157  * variants disable/enable preemption.
 158  */
 159 #ifdef  CONFIG_SMP
 160 #define __disk_stat_add(gendiskp, field, addnd)         \
 161         (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
 162
 163 #define disk_stat_read(gendiskp, field)                                 \
 164 ({                                                                      \
 165         typeof(gendiskp->dkstats->field) res = 0;                       \
 166         int i;                                                          \
 167         for_each_possible_cpu(i)                                        \
 168                 res += per_cpu_ptr(gendiskp->dkstats, i)->field;        \
 169         res;                                                            \
 170 })
 171
 172 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)       {
 173         int i;
 174         for_each_possible_cpu(i)
 175                 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
 176                                 sizeof (struct disk_stats));
 177 }
 178
 179 #else
 180 #define __disk_stat_add(gendiskp, field, addnd) \
 181                                 (gendiskp->dkstats.field += addnd)
 182 #define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
 183
 184 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)       {
 185         memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
 186 }
 187 #endif
 188
 189 #define disk_stat_add(gendiskp, field, addnd)                   \
 190         do {                                                    \
 191                 preempt_disable();                              \
 192                 __disk_stat_add(gendiskp, field, addnd);        \
 193                 preempt_enable();                               \
 194         } while (0)
 195
 196 #define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
 197 #define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
 198
 199 #define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
 200 #define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
 201
 202 #define __disk_stat_sub(gendiskp, field, subnd) \
 203                 __disk_stat_add(gendiskp, field, -subnd)
 204 #define disk_stat_sub(gendiskp, field, subnd) \
 205                 disk_stat_add(gendiskp, field, -subnd)
 206
 207
 208 /* Inlines to alloc and free disk stats in struct gendisk */
 209 #ifdef  CONFIG_SMP
 210 static inline int init_disk_stats(struct gendisk *disk)
 211 {
 212         disk->dkstats = alloc_percpu(struct disk_stats);
 213         if (!disk->dkstats)
 214                 return 0;
 215         return 1;
 216 }
 217
 218 static inline void free_disk_stats(struct gendisk *disk)
 219 {
 220         free_percpu(disk->dkstats);
 221 }
 222 #else   /* CONFIG_SMP */
 223 static inline int init_disk_stats(struct gendisk *disk)
 224 {
 225         return 1;
 226 }
 227
 228 static inline void free_disk_stats(struct gendisk *disk)
 229 {
 230 }
 231 #endif  /* CONFIG_SMP */
 232
 233 /* drivers/block/ll_rw_blk.c */
 234 extern void disk_round_stats(struct gendisk *disk);
 235
 236 /* drivers/block/genhd.c */
 237 extern int get_blkdev_list(char *, int);
 238 extern void add_disk(struct gendisk *disk);
 239 extern void del_gendisk(struct gendisk *gp);
 240 extern void unlink_gendisk(struct gendisk *gp);
 241 extern struct gendisk *get_gendisk(dev_t dev, int *part);
 242
 243 extern void set_device_ro(struct block_device *bdev, int flag);
 244 extern void set_disk_ro(struct gendisk *disk, int flag);
 245
 246 /* drivers/char/random.c */
 247 extern void add_disk_randomness(struct gendisk *disk);
 248 extern void rand_initialize_disk(struct gendisk *disk);
 249
 250 static inline sector_t get_start_sect(struct block_device *bdev)
 251 {
 252         return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
 253 }
 254 static inline sector_t get_capacity(struct gendisk *disk)
 255 {
 256         return disk->capacity;
 257 }
 258 static inline void set_capacity(struct gendisk *disk, sector_t size)
 259 {
 260         disk->capacity = size;
 261 }
 262
 263 #endif  /*  __KERNEL__  */
 264
 265 #ifdef CONFIG_SOLARIS_X86_PARTITION
 266
 267 #define SOLARIS_X86_NUMSLICE    16
 268 #define SOLARIS_X86_VTOC_SANE   (0x600DDEEEUL)
 269
 270 struct solaris_x86_slice {
 271         __le16 s_tag;           /* ID tag of partition */
 272         __le16 s_flag;          /* permission flags */
 273         __le32 s_start;         /* start sector no of partition */
 274         __le32 s_size;          /* # of blocks in partition */
 275 };
 276
 277 struct solaris_x86_vtoc {
 278         unsigned int v_bootinfo[3];     /* info needed by mboot (unsupported) */
 279         __le32 v_sanity;                /* to verify vtoc sanity */
 280         __le32 v_version;               /* layout version */
 281         char    v_volume[8];            /* volume name */
 282         __le16  v_sectorsz;             /* sector size in bytes */
 283         __le16  v_nparts;               /* number of partitions */
 284         unsigned int v_reserved[10];    /* free space */
 285         struct solaris_x86_slice
 286                 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
 287         unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
 288         char    v_asciilabel[128];      /* for compatibility */
 289 };
 290
 291 #endif /* CONFIG_SOLARIS_X86_PARTITION */
 292
 293 #ifdef CONFIG_BSD_DISKLABEL
 294 /*
 295  * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
 296  * updated by Marc Espie <Marc.Espie@openbsd.org>
 297  */
 298
 299 /* check against BSD src/sys/sys/disklabel.h for consistency */
 300
 301 #define BSD_DISKMAGIC   (0x82564557UL)  /* The disk magic number */
 302 #define BSD_MAXPARTITIONS       16
 303 #define OPENBSD_MAXPARTITIONS   16
 304 #define BSD_FS_UNUSED           0       /* disklabel unused partition entry ID */
 305 struct bsd_disklabel {
 306         __le32  d_magic;                /* the magic number */
 307         __s16   d_type;                 /* drive type */
 308         __s16   d_subtype;              /* controller/d_type specific */
 309         char    d_typename[16];         /* type name, e.g. "eagle" */
 310         char    d_packname[16];                 /* pack identifier */
 311         __u32   d_secsize;              /* # of bytes per sector */
 312         __u32   d_nsectors;             /* # of data sectors per track */
 313         __u32   d_ntracks;              /* # of tracks per cylinder */
 314         __u32   d_ncylinders;           /* # of data cylinders per unit */
 315         __u32   d_secpercyl;            /* # of data sectors per cylinder */
 316         __u32   d_secperunit;           /* # of data sectors per unit */
 317         __u16   d_sparespertrack;       /* # of spare sectors per track */
 318         __u16   d_sparespercyl;         /* # of spare sectors per cylinder */
 319         __u32   d_acylinders;           /* # of alt. cylinders per unit */
 320         __u16   d_rpm;                  /* rotational speed */
 321         __u16   d_interleave;           /* hardware sector interleave */
 322         __u16   d_trackskew;            /* sector 0 skew, per track */
 323         __u16   d_cylskew;              /* sector 0 skew, per cylinder */
 324         __u32   d_headswitch;           /* head switch time, usec */
 325         __u32   d_trkseek;              /* track-to-track seek, usec */
 326         __u32   d_flags;                /* generic flags */
 327 #define NDDATA 5
 328         __u32   d_drivedata[NDDATA];    /* drive-type specific information */
 329 #define NSPARE 5
 330         __u32   d_spare[NSPARE];        /* reserved for future use */
 331         __le32  d_magic2;               /* the magic number (again) */
 332         __le16  d_checksum;             /* xor of data incl. partitions */
 333
 334                         /* filesystem and partition information: */
 335         __le16  d_npartitions;          /* number of partitions in following */
 336         __le32  d_bbsize;               /* size of boot area at sn0, bytes */
 337         __le32  d_sbsize;               /* max size of fs superblock, bytes */
 338         struct  bsd_partition {         /* the partition table */
 339                 __le32  p_size;         /* number of sectors in partition */
 340                 __le32  p_offset;       /* starting sector */
 341                 __le32  p_fsize;        /* filesystem basic fragment size */
 342                 __u8    p_fstype;       /* filesystem type, see below */
 343                 __u8    p_frag;         /* filesystem fragments per block */
 344                 __le16  p_cpg;          /* filesystem cylinders per group */
 345         } d_partitions[BSD_MAXPARTITIONS];      /* actually may be more */
 346 };
 347
 348 #endif  /* CONFIG_BSD_DISKLABEL */
 349
 350 #ifdef CONFIG_UNIXWARE_DISKLABEL
 351 /*
 352  * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
 353  * and Krzysztof G. Baranowski <kgb@knm.org.pl>
 354  */
 355
 356 #define UNIXWARE_DISKMAGIC     (0xCA5E600DUL)   /* The disk magic number */
 357 #define UNIXWARE_DISKMAGIC2    (0x600DDEEEUL)   /* The slice table magic nr */
 358 #define UNIXWARE_NUMSLICE      16
 359 #define UNIXWARE_FS_UNUSED     0                /* Unused slice entry ID */
 360
 361 struct unixware_slice {
 362         __le16   s_label;       /* label */
 363         __le16   s_flags;       /* permission flags */
 364         __le32   start_sect;    /* starting sector */
 365         __le32   nr_sects;      /* number of sectors in slice */
 366 };
 367
 368 struct unixware_disklabel {
 369         __le32   d_type;                /* drive type */
 370         __le32   d_magic;                /* the magic number */
 371         __le32   d_version;              /* version number */
 372         char    d_serial[12];           /* serial number of the device */
 373         __le32   d_ncylinders;           /* # of data cylinders per device */
 374         __le32   d_ntracks;              /* # of tracks per cylinder */
 375         __le32   d_nsectors;             /* # of data sectors per track */
 376         __le32   d_secsize;              /* # of bytes per sector */
 377         __le32   d_part_start;           /* # of first sector of this partition */
 378         __le32   d_unknown1[12];         /* ? */
 379         __le32  d_alt_tbl;              /* byte offset of alternate table */
 380         __le32  d_alt_len;              /* byte length of alternate table */
 381         __le32  d_phys_cyl;             /* # of physical cylinders per device */
 382         __le32  d_phys_trk;             /* # of physical tracks per cylinder */
 383         __le32  d_phys_sec;             /* # of physical sectors per track */
 384         __le32  d_phys_bytes;           /* # of physical bytes per sector */
 385         __le32  d_unknown2;             /* ? */
 386         __le32   d_unknown3;             /* ? */
 387         __le32  d_pad[8];               /* pad */
 388
 389         struct unixware_vtoc {
 390                 __le32  v_magic;                /* the magic number */
 391                 __le32  v_version;              /* version number */
 392                 char    v_name[8];              /* volume name */
 393                 __le16  v_nslices;              /* # of slices */
 394                 __le16  v_unknown1;             /* ? */
 395                 __le32  v_reserved[10];         /* reserved */
 396                 struct unixware_slice
 397                         v_slice[UNIXWARE_NUMSLICE];     /* slice headers */
 398         } vtoc;
 399
 400 };  /* 408 */
 401
 402 #endif /* CONFIG_UNIXWARE_DISKLABEL */
 403
 404 #ifdef CONFIG_MINIX_SUBPARTITION
 405 #   define MINIX_NR_SUBPARTITIONS  4
 406 #endif /* CONFIG_MINIX_SUBPARTITION */
 407
 408 #ifdef __KERNEL__
 409
 410 #define ADDPART_FLAG_NONE       0
 411 #define ADDPART_FLAG_RAID       1
 412 #define ADDPART_FLAG_WHOLEDISK  2
 413
 414 char *disk_name (struct gendisk *hd, int part, char *buf);
 415
 416 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
 417 extern void add_partition(struct gendisk *, int, sector_t, sector_t, int);
 418 extern void delete_partition(struct gendisk *, int);
 419 extern void printk_all_partitions(void);
 420
 421 extern struct gendisk *alloc_disk_node(int minors, int node_id);
 422 extern struct gendisk *alloc_disk(int minors);
 423 extern struct kobject *get_disk(struct gendisk *disk);
 424 extern void put_disk(struct gendisk *disk);
 425 extern void genhd_media_change_notify(struct gendisk *disk);
 426 extern void blk_register_region(dev_t dev, unsigned long range,
 427                         struct module *module,
 428                         struct kobject *(*probe)(dev_t, int *, void *),
 429                         int (*lock)(dev_t, void *),
 430                         void *data);
 431 extern void blk_unregister_region(dev_t dev, unsigned long range);
 432
 433 static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
 434 {
 435         return bdget(MKDEV(disk->major, disk->first_minor) + index);
 436 }
 437
 438 #endif
 439
 440 #else /* CONFIG_BLOCK */
 441
 442 static inline void printk_all_partitions(void) { }
 443
 444 #endif /* CONFIG_BLOCK */
 445
 446 #endif