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 #include <linux/kdev_t.h>
  14
  15 #ifdef CONFIG_BLOCK
  16
  17 #define kobj_to_dev(k) container_of(k, struct device, kobj)
  18 #define dev_to_disk(device) container_of(device, struct gendisk, dev)
  19 #define dev_to_part(device) container_of(device, struct hd_struct, dev)
  20
  21 extern struct device_type disk_type;
  22 extern struct device_type part_type;
  23 extern struct kobject *block_depr;
  24 extern struct class block_class;
  25
  26 enum {
  27 /* These three have identical behaviour; use the second one if DOS FDISK gets
  28    confused about extended/logical partitions starting past cylinder 1023. */
  29         DOS_EXTENDED_PARTITION = 5,
  30         LINUX_EXTENDED_PARTITION = 0x85,
  31         WIN98_EXTENDED_PARTITION = 0x0f,
  32
  33         SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
  34
  35         LINUX_SWAP_PARTITION = 0x82,
  36         LINUX_DATA_PARTITION = 0x83,
  37         LINUX_LVM_PARTITION = 0x8e,
  38         LINUX_RAID_PARTITION = 0xfd,    /* autodetect RAID partition */
  39
  40         SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
  41         NEW_SOLARIS_X86_PARTITION = 0xbf,
  42
  43         DM6_AUX1PARTITION = 0x51,       /* no DDO:  use xlated geom */
  44         DM6_AUX3PARTITION = 0x53,       /* no DDO:  use xlated geom */
  45         DM6_PARTITION = 0x54,           /* has DDO: use xlated geom & offset */
  46         EZD_PARTITION = 0x55,           /* EZ-DRIVE */
  47
  48         FREEBSD_PARTITION = 0xa5,       /* FreeBSD Partition ID */
  49         OPENBSD_PARTITION = 0xa6,       /* OpenBSD Partition ID */
  50         NETBSD_PARTITION = 0xa9,        /* NetBSD Partition ID */
  51         BSDI_PARTITION = 0xb7,          /* BSDI Partition ID */
  52         MINIX_PARTITION = 0x81,         /* Minix Partition ID */
  53         UNIXWARE_PARTITION = 0x63,      /* Same as GNU_HURD and SCO Unix */
  54 };
  55
  56 #ifndef __KERNEL__
  57
  58 struct partition {
  59         unsigned char boot_ind;         /* 0x80 - active */
  60         unsigned char head;             /* starting head */
  61         unsigned char sector;           /* starting sector */
  62         unsigned char cyl;              /* starting cylinder */
  63         unsigned char sys_ind;          /* What partition type */
  64         unsigned char end_head;         /* end head */
  65         unsigned char end_sector;       /* end sector */
  66         unsigned char end_cyl;          /* end cylinder */
  67         unsigned int start_sect;        /* starting sector counting from 0 */
  68         unsigned int nr_sects;          /* nr of sectors in partition */
  69 } __attribute__((packed));
  70
  71 #endif
  72
  73 #ifdef __KERNEL__
  74 #include <linux/major.h>
  75 #include <linux/device.h>
  76 #include <linux/smp.h>
  77 #include <linux/string.h>
  78 #include <linux/fs.h>
  79 #include <linux/workqueue.h>
  80
  81 struct partition {
  82         unsigned char boot_ind;         /* 0x80 - active */
  83         unsigned char head;             /* starting head */
  84         unsigned char sector;           /* starting sector */
  85         unsigned char cyl;              /* starting cylinder */
  86         unsigned char sys_ind;          /* What partition type */
  87         unsigned char end_head;         /* end head */
  88         unsigned char end_sector;       /* end sector */
  89         unsigned char end_cyl;          /* end cylinder */
  90         __le32 start_sect;      /* starting sector counting from 0 */
  91         __le32 nr_sects;                /* nr of sectors in partition */
  92 } __attribute__((packed));
  93
  94 struct hd_struct {
  95         sector_t start_sect;
  96         sector_t nr_sects;
  97         struct device dev;
  98         struct kobject *holder_dir;
  99         unsigned ios[2], sectors[2];    /* READs and WRITEs */
 100         int policy, partno;
 101 #ifdef CONFIG_FAIL_MAKE_REQUEST
 102         int make_it_fail;
 103 #endif
 104 };
 105
 106 #define GENHD_FL_REMOVABLE                      1
 107 #define GENHD_FL_DRIVERFS                       2
 108 #define GENHD_FL_MEDIA_CHANGE_NOTIFY            4
 109 #define GENHD_FL_CD                             8
 110 #define GENHD_FL_UP                             16
 111 #define GENHD_FL_SUPPRESS_PARTITION_INFO        32
 112 #define GENHD_FL_FAIL                           64
 113
 114 struct disk_stats {
 115         unsigned long sectors[2];       /* READs and WRITEs */
 116         unsigned long ios[2];
 117         unsigned long merges[2];
 118         unsigned long ticks[2];
 119         unsigned long io_ticks;
 120         unsigned long time_in_queue;
 121 };
 122
 123 struct gendisk {
 124         int major;                      /* major number of driver */
 125         int first_minor;
 126         int minors;                     /* maximum number of minors, =1 for
 127                                          * disks that can't be partitioned. */
 128         char disk_name[32];             /* name of major driver */
 129         struct hd_struct **part;        /* [indexed by minor] */
 130         struct block_device_operations *fops;
 131         struct request_queue *queue;
 132         void *private_data;
 133         sector_t capacity;
 134
 135         int flags;
 136         struct device *driverfs_dev;  // FIXME: remove
 137         struct device dev;
 138         struct kobject *holder_dir;
 139         struct kobject *slave_dir;
 140
 141         struct timer_rand_state *random;
 142         int policy;
 143
 144         atomic_t sync_io;               /* RAID */
 145         unsigned long stamp;
 146         int in_flight;
 147 #ifdef  CONFIG_SMP
 148         struct disk_stats *dkstats;
 149 #else
 150         struct disk_stats dkstats;
 151 #endif
 152         struct work_struct async_notify;
 153 };
 154
 155 /*
 156  * Macros to operate on percpu disk statistics:
 157  *
 158  * The __ variants should only be called in critical sections. The full
 159  * variants disable/enable preemption.
 160  */
 161 #ifdef  CONFIG_SMP
 162 #define __disk_stat_add(gendiskp, field, addnd)         \
 163         (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
 164
 165 #define disk_stat_read(gendiskp, field)                                 \
 166 ({                                                                      \
 167         typeof(gendiskp->dkstats->field) res = 0;                       \
 168         int i;                                                          \
 169         for_each_possible_cpu(i)                                        \
 170                 res += per_cpu_ptr(gendiskp->dkstats, i)->field;        \
 171         res;                                                            \
 172 })
 173
 174 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)       {
 175         int i;
 176         for_each_possible_cpu(i)
 177                 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
 178                                 sizeof (struct disk_stats));
 179 }
 180
 181 #else
 182 #define __disk_stat_add(gendiskp, field, addnd) \
 183                                 (gendiskp->dkstats.field += addnd)
 184 #define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
 185
 186 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)       {
 187         memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
 188 }
 189 #endif
 190
 191 #define disk_stat_add(gendiskp, field, addnd)                   \
 192         do {                                                    \
 193                 preempt_disable();                              \
 194                 __disk_stat_add(gendiskp, field, addnd);        \
 195                 preempt_enable();                               \
 196         } while (0)
 197
 198 #define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
 199 #define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
 200
 201 #define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
 202 #define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
 203
 204 #define __disk_stat_sub(gendiskp, field, subnd) \
 205                 __disk_stat_add(gendiskp, field, -subnd)
 206 #define disk_stat_sub(gendiskp, field, subnd) \
 207                 disk_stat_add(gendiskp, field, -subnd)
 208
 209
 210 /* Inlines to alloc and free disk stats in struct gendisk */
 211 #ifdef  CONFIG_SMP
 212 static inline int init_disk_stats(struct gendisk *disk)
 213 {
 214         disk->dkstats = alloc_percpu(struct disk_stats);
 215         if (!disk->dkstats)
 216                 return 0;
 217         return 1;
 218 }
 219
 220 static inline void free_disk_stats(struct gendisk *disk)
 221 {
 222         free_percpu(disk->dkstats);
 223 }
 224 #else   /* CONFIG_SMP */
 225 static inline int init_disk_stats(struct gendisk *disk)
 226 {
 227         return 1;
 228 }
 229
 230 static inline void free_disk_stats(struct gendisk *disk)
 231 {
 232 }
 233 #endif  /* CONFIG_SMP */
 234
 235 /* drivers/block/ll_rw_blk.c */
 236 extern void disk_round_stats(struct gendisk *disk);
 237
 238 /* drivers/block/genhd.c */
 239 extern int get_blkdev_list(char *, int);
 240 extern void add_disk(struct gendisk *disk);
 241 extern void del_gendisk(struct gendisk *gp);
 242 extern void unlink_gendisk(struct gendisk *gp);
 243 extern struct gendisk *get_gendisk(dev_t dev, int *part);
 244
 245 extern void set_device_ro(struct block_device *bdev, int flag);
 246 extern void set_disk_ro(struct gendisk *disk, int flag);
 247
 248 /* drivers/char/random.c */
 249 extern void add_disk_randomness(struct gendisk *disk);
 250 extern void rand_initialize_disk(struct gendisk *disk);
 251
 252 static inline sector_t get_start_sect(struct block_device *bdev)
 253 {
 254         return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
 255 }
 256 static inline sector_t get_capacity(struct gendisk *disk)
 257 {
 258         return disk->capacity;
 259 }
 260 static inline void set_capacity(struct gendisk *disk, sector_t size)
 261 {
 262         disk->capacity = size;
 263 }
 264
 265 #endif  /*  __KERNEL__  */
 266
 267 #ifdef CONFIG_SOLARIS_X86_PARTITION
 268
 269 #define SOLARIS_X86_NUMSLICE    16
 270 #define SOLARIS_X86_VTOC_SANE   (0x600DDEEEUL)
 271
 272 struct solaris_x86_slice {
 273         __le16 s_tag;           /* ID tag of partition */
 274         __le16 s_flag;          /* permission flags */
 275         __le32 s_start;         /* start sector no of partition */
 276         __le32 s_size;          /* # of blocks in partition */
 277 };
 278
 279 struct solaris_x86_vtoc {
 280         unsigned int v_bootinfo[3];     /* info needed by mboot (unsupported) */
 281         __le32 v_sanity;                /* to verify vtoc sanity */
 282         __le32 v_version;               /* layout version */
 283         char    v_volume[8];            /* volume name */
 284         __le16  v_sectorsz;             /* sector size in bytes */
 285         __le16  v_nparts;               /* number of partitions */
 286         unsigned int v_reserved[10];    /* free space */
 287         struct solaris_x86_slice
 288                 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
 289         unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
 290         char    v_asciilabel[128];      /* for compatibility */
 291 };
 292
 293 #endif /* CONFIG_SOLARIS_X86_PARTITION */
 294
 295 #ifdef CONFIG_BSD_DISKLABEL
 296 /*
 297  * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
 298  * updated by Marc Espie <Marc.Espie@openbsd.org>
 299  */
 300
 301 /* check against BSD src/sys/sys/disklabel.h for consistency */
 302
 303 #define BSD_DISKMAGIC   (0x82564557UL)  /* The disk magic number */
 304 #define BSD_MAXPARTITIONS       16
 305 #define OPENBSD_MAXPARTITIONS   16
 306 #define BSD_FS_UNUSED           0       /* disklabel unused partition entry ID */
 307 struct bsd_disklabel {
 308         __le32  d_magic;                /* the magic number */
 309         __s16   d_type;                 /* drive type */
 310         __s16   d_subtype;              /* controller/d_type specific */
 311         char    d_typename[16];         /* type name, e.g. "eagle" */
 312         char    d_packname[16];                 /* pack identifier */
 313         __u32   d_secsize;              /* # of bytes per sector */
 314         __u32   d_nsectors;             /* # of data sectors per track */
 315         __u32   d_ntracks;              /* # of tracks per cylinder */
 316         __u32   d_ncylinders;           /* # of data cylinders per unit */
 317         __u32   d_secpercyl;            /* # of data sectors per cylinder */
 318         __u32   d_secperunit;           /* # of data sectors per unit */
 319         __u16   d_sparespertrack;       /* # of spare sectors per track */
 320         __u16   d_sparespercyl;         /* # of spare sectors per cylinder */
 321         __u32   d_acylinders;           /* # of alt. cylinders per unit */
 322         __u16   d_rpm;                  /* rotational speed */
 323         __u16   d_interleave;           /* hardware sector interleave */
 324         __u16   d_trackskew;            /* sector 0 skew, per track */
 325         __u16   d_cylskew;              /* sector 0 skew, per cylinder */
 326         __u32   d_headswitch;           /* head switch time, usec */
 327         __u32   d_trkseek;              /* track-to-track seek, usec */
 328         __u32   d_flags;                /* generic flags */
 329 #define NDDATA 5
 330         __u32   d_drivedata[NDDATA];    /* drive-type specific information */
 331 #define NSPARE 5
 332         __u32   d_spare[NSPARE];        /* reserved for future use */
 333         __le32  d_magic2;               /* the magic number (again) */
 334         __le16  d_checksum;             /* xor of data incl. partitions */
 335
 336                         /* filesystem and partition information: */
 337         __le16  d_npartitions;          /* number of partitions in following */
 338         __le32  d_bbsize;               /* size of boot area at sn0, bytes */
 339         __le32  d_sbsize;               /* max size of fs superblock, bytes */
 340         struct  bsd_partition {         /* the partition table */
 341                 __le32  p_size;         /* number of sectors in partition */
 342                 __le32  p_offset;       /* starting sector */
 343                 __le32  p_fsize;        /* filesystem basic fragment size */
 344                 __u8    p_fstype;       /* filesystem type, see below */
 345                 __u8    p_frag;         /* filesystem fragments per block */
 346                 __le16  p_cpg;          /* filesystem cylinders per group */
 347         } d_partitions[BSD_MAXPARTITIONS];      /* actually may be more */
 348 };
 349
 350 #endif  /* CONFIG_BSD_DISKLABEL */
 351
 352 #ifdef CONFIG_UNIXWARE_DISKLABEL
 353 /*
 354  * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
 355  * and Krzysztof G. Baranowski <kgb@knm.org.pl>
 356  */
 357
 358 #define UNIXWARE_DISKMAGIC     (0xCA5E600DUL)   /* The disk magic number */
 359 #define UNIXWARE_DISKMAGIC2    (0x600DDEEEUL)   /* The slice table magic nr */
 360 #define UNIXWARE_NUMSLICE      16
 361 #define UNIXWARE_FS_UNUSED     0                /* Unused slice entry ID */
 362
 363 struct unixware_slice {
 364         __le16   s_label;       /* label */
 365         __le16   s_flags;       /* permission flags */
 366         __le32   start_sect;    /* starting sector */
 367         __le32   nr_sects;      /* number of sectors in slice */
 368 };
 369
 370 struct unixware_disklabel {
 371         __le32   d_type;                /* drive type */
 372         __le32   d_magic;                /* the magic number */
 373         __le32   d_version;              /* version number */
 374         char    d_serial[12];           /* serial number of the device */
 375         __le32   d_ncylinders;           /* # of data cylinders per device */
 376         __le32   d_ntracks;              /* # of tracks per cylinder */
 377         __le32   d_nsectors;             /* # of data sectors per track */
 378         __le32   d_secsize;              /* # of bytes per sector */
 379         __le32   d_part_start;           /* # of first sector of this partition */
 380         __le32   d_unknown1[12];         /* ? */
 381         __le32  d_alt_tbl;              /* byte offset of alternate table */
 382         __le32  d_alt_len;              /* byte length of alternate table */
 383         __le32  d_phys_cyl;             /* # of physical cylinders per device */
 384         __le32  d_phys_trk;             /* # of physical tracks per cylinder */
 385         __le32  d_phys_sec;             /* # of physical sectors per track */
 386         __le32  d_phys_bytes;           /* # of physical bytes per sector */
 387         __le32  d_unknown2;             /* ? */
 388         __le32   d_unknown3;             /* ? */
 389         __le32  d_pad[8];               /* pad */
 390
 391         struct unixware_vtoc {
 392                 __le32  v_magic;                /* the magic number */
 393                 __le32  v_version;              /* version number */
 394                 char    v_name[8];              /* volume name */
 395                 __le16  v_nslices;              /* # of slices */
 396                 __le16  v_unknown1;             /* ? */
 397                 __le32  v_reserved[10];         /* reserved */
 398                 struct unixware_slice
 399                         v_slice[UNIXWARE_NUMSLICE];     /* slice headers */
 400         } vtoc;
 401
 402 };  /* 408 */
 403
 404 #endif /* CONFIG_UNIXWARE_DISKLABEL */
 405
 406 #ifdef CONFIG_MINIX_SUBPARTITION
 407 #   define MINIX_NR_SUBPARTITIONS  4
 408 #endif /* CONFIG_MINIX_SUBPARTITION */
 409
 410 #ifdef __KERNEL__
 411
 412 #define ADDPART_FLAG_NONE       0
 413 #define ADDPART_FLAG_RAID       1
 414 #define ADDPART_FLAG_WHOLEDISK  2
 415
 416 extern dev_t blk_lookup_devt(const char *name);
 417 extern char *disk_name (struct gendisk *hd, int part, char *buf);
 418
 419 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
 420 extern void add_partition(struct gendisk *, int, sector_t, sector_t, int);
 421 extern void delete_partition(struct gendisk *, int);
 422 extern void printk_all_partitions(void);
 423
 424 extern struct gendisk *alloc_disk_node(int minors, int node_id);
 425 extern struct gendisk *alloc_disk(int minors);
 426 extern struct kobject *get_disk(struct gendisk *disk);
 427 extern void put_disk(struct gendisk *disk);
 428 extern void genhd_media_change_notify(struct gendisk *disk);
 429 extern void blk_register_region(dev_t devt, unsigned long range,
 430                         struct module *module,
 431                         struct kobject *(*probe)(dev_t, int *, void *),
 432                         int (*lock)(dev_t, void *),
 433                         void *data);
 434 extern void blk_unregister_region(dev_t devt, unsigned long range);
 435
 436 static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
 437 {
 438         return bdget(MKDEV(disk->major, disk->first_minor) + index);
 439 }
 440
 441 #endif
 442
 443 #else /* CONFIG_BLOCK */
 444
 445 static inline void printk_all_partitions(void) { }
 446
 447 static inline dev_t blk_lookup_devt(const char *name)
 448 {
 449         dev_t devt = MKDEV(0, 0);
 450         return devt;
 451 }
 452
 453 #endif /* CONFIG_BLOCK */
 454
 455 #endif