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 disk_stats {
  95         unsigned long sectors[2];       /* READs and WRITEs */
  96         unsigned long ios[2];
  97         unsigned long merges[2];
  98         unsigned long ticks[2];
  99         unsigned long io_ticks;
 100         unsigned long time_in_queue;
 101 };
 102
 103 struct hd_struct {
 104         sector_t start_sect;
 105         sector_t nr_sects;
 106         struct device dev;
 107         struct kobject *holder_dir;
 108         unsigned ios[2], sectors[2];    /* READs and WRITEs */
 109         int policy, partno;
 110 #ifdef CONFIG_FAIL_MAKE_REQUEST
 111         int make_it_fail;
 112 #endif
 113         unsigned long stamp;
 114         int in_flight;
 115 #ifdef  CONFIG_SMP
 116         struct disk_stats *dkstats;
 117 #else
 118         struct disk_stats dkstats;
 119 #endif
 120 };
 121
 122 #define GENHD_FL_REMOVABLE                      1
 123 #define GENHD_FL_DRIVERFS                       2
 124 #define GENHD_FL_MEDIA_CHANGE_NOTIFY            4
 125 #define GENHD_FL_CD                             8
 126 #define GENHD_FL_UP                             16
 127 #define GENHD_FL_SUPPRESS_PARTITION_INFO        32
 128 #define GENHD_FL_FAIL                           64
 129
 130
 131 struct gendisk {
 132         int major;                      /* major number of driver */
 133         int first_minor;
 134         int minors;                     /* maximum number of minors, =1 for
 135                                          * disks that can't be partitioned. */
 136         char disk_name[32];             /* name of major driver */
 137         struct hd_struct **part;        /* [indexed by minor] */
 138         struct block_device_operations *fops;
 139         struct request_queue *queue;
 140         void *private_data;
 141         sector_t capacity;
 142
 143         int flags;
 144         struct device *driverfs_dev;  // FIXME: remove
 145         struct device dev;
 146         struct kobject *holder_dir;
 147         struct kobject *slave_dir;
 148
 149         struct timer_rand_state *random;
 150         int policy;
 151
 152         atomic_t sync_io;               /* RAID */
 153         unsigned long stamp;
 154         int in_flight;
 155 #ifdef  CONFIG_SMP
 156         struct disk_stats *dkstats;
 157 #else
 158         struct disk_stats dkstats;
 159 #endif
 160         struct work_struct async_notify;
 161 };
 162
 163 /*
 164  * Macros to operate on percpu disk statistics:
 165  *
 166  * The __ variants should only be called in critical sections. The full
 167  * variants disable/enable preemption.
 168  */
 169 static inline struct hd_struct *get_part(struct gendisk *gendiskp,
 170                                          sector_t sector)
 171 {
 172         struct hd_struct *part;
 173         int i;
 174         for (i = 0; i < gendiskp->minors - 1; i++) {
 175                 part = gendiskp->part[i];
 176                 if (part && part->start_sect <= sector
 177                     && sector < part->start_sect + part->nr_sects)
 178                         return part;
 179         }
 180         return NULL;
 181 }
 182
 183 #ifdef  CONFIG_SMP
 184 #define __disk_stat_add(gendiskp, field, addnd)         \
 185         (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
 186
 187 #define disk_stat_read(gendiskp, field)                                 \
 188 ({                                                                      \
 189         typeof(gendiskp->dkstats->field) res = 0;                       \
 190         int i;                                                          \
 191         for_each_possible_cpu(i)                                        \
 192                 res += per_cpu_ptr(gendiskp->dkstats, i)->field;        \
 193         res;                                                            \
 194 })
 195
 196 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)       {
 197         int i;
 198         for_each_possible_cpu(i)
 199                 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
 200                                 sizeof (struct disk_stats));
 201 }
 202
 203 #define __part_stat_add(part, field, addnd)                             \
 204         (per_cpu_ptr(part->dkstats, smp_processor_id())->field += addnd)
 205
 206 #define __all_stat_add(gendiskp, field, addnd, sector)          \
 207 ({                                                              \
 208         struct hd_struct *part = get_part(gendiskp, sector);    \
 209         if (part)                                               \
 210                 __part_stat_add(part, field, addnd);            \
 211         __disk_stat_add(gendiskp, field, addnd);                \
 212 })
 213
 214 #define part_stat_read(part, field)                                     \
 215 ({                                                                      \
 216         typeof(part->dkstats->field) res = 0;                           \
 217         int i;                                                          \
 218         for_each_possible_cpu(i)                                        \
 219                 res += per_cpu_ptr(part->dkstats, i)->field;            \
 220         res;                                                            \
 221 })
 222
 223 static inline void part_stat_set_all(struct hd_struct *part, int value) {
 224         int i;
 225         for_each_possible_cpu(i)
 226                 memset(per_cpu_ptr(part->dkstats, i), value,
 227                        sizeof(struct disk_stats));
 228 }
 229
 230 #else
 231 #define __disk_stat_add(gendiskp, field, addnd) \
 232                                 (gendiskp->dkstats.field += addnd)
 233 #define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
 234
 235 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
 236 {
 237         memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
 238 }
 239
 240 #define __part_stat_add(part, field, addnd) \
 241         (part->dkstats.field += addnd)
 242
 243 #define __all_stat_add(gendiskp, field, addnd, sector)          \
 244 ({                                                              \
 245         struct hd_struct *part = get_part(gendiskp, sector);    \
 246         if (part)                                               \
 247                 part->dkstats.field += addnd;                   \
 248         __disk_stat_add(gendiskp, field, addnd);                \
 249 })
 250
 251 #define part_stat_read(part, field)     (part->dkstats.field)
 252
 253 static inline void part_stat_set_all(struct hd_struct *part, int value)
 254 {
 255         memset(&part->dkstats, value, sizeof(struct disk_stats));
 256 }
 257
 258 #endif
 259
 260 #define disk_stat_add(gendiskp, field, addnd)                   \
 261         do {                                                    \
 262                 preempt_disable();                              \
 263                 __disk_stat_add(gendiskp, field, addnd);        \
 264                 preempt_enable();                               \
 265         } while (0)
 266
 267 #define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
 268 #define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
 269
 270 #define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
 271 #define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
 272
 273 #define __disk_stat_sub(gendiskp, field, subnd) \
 274                 __disk_stat_add(gendiskp, field, -subnd)
 275 #define disk_stat_sub(gendiskp, field, subnd) \
 276                 disk_stat_add(gendiskp, field, -subnd)
 277
 278 #define part_stat_add(gendiskp, field, addnd)           \
 279         do {                                            \
 280                 preempt_disable();                      \
 281                 __part_stat_add(gendiskp, field, addnd);\
 282                 preempt_enable();                       \
 283         } while (0)
 284
 285 #define __part_stat_dec(gendiskp, field) __part_stat_add(gendiskp, field, -1)
 286 #define part_stat_dec(gendiskp, field) part_stat_add(gendiskp, field, -1)
 287
 288 #define __part_stat_inc(gendiskp, field) __part_stat_add(gendiskp, field, 1)
 289 #define part_stat_inc(gendiskp, field) part_stat_add(gendiskp, field, 1)
 290
 291 #define __part_stat_sub(gendiskp, field, subnd) \
 292                 __part_stat_add(gendiskp, field, -subnd)
 293 #define part_stat_sub(gendiskp, field, subnd) \
 294                 part_stat_add(gendiskp, field, -subnd)
 295
 296 #define all_stat_add(gendiskp, field, addnd, sector)            \
 297         do {                                                    \
 298                 preempt_disable();                              \
 299                 __all_stat_add(gendiskp, field, addnd, sector); \
 300                 preempt_enable();                               \
 301         } while (0)
 302
 303 #define __all_stat_dec(gendiskp, field, sector) \
 304                 __all_stat_add(gendiskp, field, -1, sector)
 305 #define all_stat_dec(gendiskp, field, sector) \
 306                 all_stat_add(gendiskp, field, -1, sector)
 307
 308 #define __all_stat_inc(gendiskp, field, sector) \
 309                 __all_stat_add(gendiskp, field, 1, sector)
 310 #define all_stat_inc(gendiskp, field, sector) \
 311                 all_stat_add(gendiskp, field, 1, sector)
 312
 313 #define __all_stat_sub(gendiskp, field, subnd, sector) \
 314                 __all_stat_add(gendiskp, field, -subnd, sector)
 315 #define all_stat_sub(gendiskp, field, subnd, sector) \
 316                 all_stat_add(gendiskp, field, -subnd, sector)
 317
 318 /* Inlines to alloc and free disk stats in struct gendisk */
 319 #ifdef  CONFIG_SMP
 320 static inline int init_disk_stats(struct gendisk *disk)
 321 {
 322         disk->dkstats = alloc_percpu(struct disk_stats);
 323         if (!disk->dkstats)
 324                 return 0;
 325         return 1;
 326 }
 327
 328 static inline void free_disk_stats(struct gendisk *disk)
 329 {
 330         free_percpu(disk->dkstats);
 331 }
 332
 333 static inline int init_part_stats(struct hd_struct *part)
 334 {
 335         part->dkstats = alloc_percpu(struct disk_stats);
 336         if (!part->dkstats)
 337                 return 0;
 338         return 1;
 339 }
 340
 341 static inline void free_part_stats(struct hd_struct *part)
 342 {
 343         free_percpu(part->dkstats);
 344 }
 345
 346 #else   /* CONFIG_SMP */
 347 static inline int init_disk_stats(struct gendisk *disk)
 348 {
 349         return 1;
 350 }
 351
 352 static inline void free_disk_stats(struct gendisk *disk)
 353 {
 354 }
 355
 356 static inline int init_part_stats(struct hd_struct *part)
 357 {
 358         return 1;
 359 }
 360
 361 static inline void free_part_stats(struct hd_struct *part)
 362 {
 363 }
 364 #endif  /* CONFIG_SMP */
 365
 366 /* drivers/block/ll_rw_blk.c */
 367 extern void disk_round_stats(struct gendisk *disk);
 368 extern void part_round_stats(struct hd_struct *part);
 369
 370 /* drivers/block/genhd.c */
 371 extern int get_blkdev_list(char *, int);
 372 extern void add_disk(struct gendisk *disk);
 373 extern void del_gendisk(struct gendisk *gp);
 374 extern void unlink_gendisk(struct gendisk *gp);
 375 extern struct gendisk *get_gendisk(dev_t dev, int *part);
 376
 377 extern void set_device_ro(struct block_device *bdev, int flag);
 378 extern void set_disk_ro(struct gendisk *disk, int flag);
 379
 380 /* drivers/char/random.c */
 381 extern void add_disk_randomness(struct gendisk *disk);
 382 extern void rand_initialize_disk(struct gendisk *disk);
 383
 384 static inline sector_t get_start_sect(struct block_device *bdev)
 385 {
 386         return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
 387 }
 388 static inline sector_t get_capacity(struct gendisk *disk)
 389 {
 390         return disk->capacity;
 391 }
 392 static inline void set_capacity(struct gendisk *disk, sector_t size)
 393 {
 394         disk->capacity = size;
 395 }
 396
 397 #endif  /*  __KERNEL__  */
 398
 399 #ifdef CONFIG_SOLARIS_X86_PARTITION
 400
 401 #define SOLARIS_X86_NUMSLICE    16
 402 #define SOLARIS_X86_VTOC_SANE   (0x600DDEEEUL)
 403
 404 struct solaris_x86_slice {
 405         __le16 s_tag;           /* ID tag of partition */
 406         __le16 s_flag;          /* permission flags */
 407         __le32 s_start;         /* start sector no of partition */
 408         __le32 s_size;          /* # of blocks in partition */
 409 };
 410
 411 struct solaris_x86_vtoc {
 412         unsigned int v_bootinfo[3];     /* info needed by mboot (unsupported) */
 413         __le32 v_sanity;                /* to verify vtoc sanity */
 414         __le32 v_version;               /* layout version */
 415         char    v_volume[8];            /* volume name */
 416         __le16  v_sectorsz;             /* sector size in bytes */
 417         __le16  v_nparts;               /* number of partitions */
 418         unsigned int v_reserved[10];    /* free space */
 419         struct solaris_x86_slice
 420                 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
 421         unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
 422         char    v_asciilabel[128];      /* for compatibility */
 423 };
 424
 425 #endif /* CONFIG_SOLARIS_X86_PARTITION */
 426
 427 #ifdef CONFIG_BSD_DISKLABEL
 428 /*
 429  * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
 430  * updated by Marc Espie <Marc.Espie@openbsd.org>
 431  */
 432
 433 /* check against BSD src/sys/sys/disklabel.h for consistency */
 434
 435 #define BSD_DISKMAGIC   (0x82564557UL)  /* The disk magic number */
 436 #define BSD_MAXPARTITIONS       16
 437 #define OPENBSD_MAXPARTITIONS   16
 438 #define BSD_FS_UNUSED           0       /* disklabel unused partition entry ID */
 439 struct bsd_disklabel {
 440         __le32  d_magic;                /* the magic number */
 441         __s16   d_type;                 /* drive type */
 442         __s16   d_subtype;              /* controller/d_type specific */
 443         char    d_typename[16];         /* type name, e.g. "eagle" */
 444         char    d_packname[16];                 /* pack identifier */
 445         __u32   d_secsize;              /* # of bytes per sector */
 446         __u32   d_nsectors;             /* # of data sectors per track */
 447         __u32   d_ntracks;              /* # of tracks per cylinder */
 448         __u32   d_ncylinders;           /* # of data cylinders per unit */
 449         __u32   d_secpercyl;            /* # of data sectors per cylinder */
 450         __u32   d_secperunit;           /* # of data sectors per unit */
 451         __u16   d_sparespertrack;       /* # of spare sectors per track */
 452         __u16   d_sparespercyl;         /* # of spare sectors per cylinder */
 453         __u32   d_acylinders;           /* # of alt. cylinders per unit */
 454         __u16   d_rpm;                  /* rotational speed */
 455         __u16   d_interleave;           /* hardware sector interleave */
 456         __u16   d_trackskew;            /* sector 0 skew, per track */
 457         __u16   d_cylskew;              /* sector 0 skew, per cylinder */
 458         __u32   d_headswitch;           /* head switch time, usec */
 459         __u32   d_trkseek;              /* track-to-track seek, usec */
 460         __u32   d_flags;                /* generic flags */
 461 #define NDDATA 5
 462         __u32   d_drivedata[NDDATA];    /* drive-type specific information */
 463 #define NSPARE 5
 464         __u32   d_spare[NSPARE];        /* reserved for future use */
 465         __le32  d_magic2;               /* the magic number (again) */
 466         __le16  d_checksum;             /* xor of data incl. partitions */
 467
 468                         /* filesystem and partition information: */
 469         __le16  d_npartitions;          /* number of partitions in following */
 470         __le32  d_bbsize;               /* size of boot area at sn0, bytes */
 471         __le32  d_sbsize;               /* max size of fs superblock, bytes */
 472         struct  bsd_partition {         /* the partition table */
 473                 __le32  p_size;         /* number of sectors in partition */
 474                 __le32  p_offset;       /* starting sector */
 475                 __le32  p_fsize;        /* filesystem basic fragment size */
 476                 __u8    p_fstype;       /* filesystem type, see below */
 477                 __u8    p_frag;         /* filesystem fragments per block */
 478                 __le16  p_cpg;          /* filesystem cylinders per group */
 479         } d_partitions[BSD_MAXPARTITIONS];      /* actually may be more */
 480 };
 481
 482 #endif  /* CONFIG_BSD_DISKLABEL */
 483
 484 #ifdef CONFIG_UNIXWARE_DISKLABEL
 485 /*
 486  * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
 487  * and Krzysztof G. Baranowski <kgb@knm.org.pl>
 488  */
 489
 490 #define UNIXWARE_DISKMAGIC     (0xCA5E600DUL)   /* The disk magic number */
 491 #define UNIXWARE_DISKMAGIC2    (0x600DDEEEUL)   /* The slice table magic nr */
 492 #define UNIXWARE_NUMSLICE      16
 493 #define UNIXWARE_FS_UNUSED     0                /* Unused slice entry ID */
 494
 495 struct unixware_slice {
 496         __le16   s_label;       /* label */
 497         __le16   s_flags;       /* permission flags */
 498         __le32   start_sect;    /* starting sector */
 499         __le32   nr_sects;      /* number of sectors in slice */
 500 };
 501
 502 struct unixware_disklabel {
 503         __le32   d_type;                /* drive type */
 504         __le32   d_magic;                /* the magic number */
 505         __le32   d_version;              /* version number */
 506         char    d_serial[12];           /* serial number of the device */
 507         __le32   d_ncylinders;           /* # of data cylinders per device */
 508         __le32   d_ntracks;              /* # of tracks per cylinder */
 509         __le32   d_nsectors;             /* # of data sectors per track */
 510         __le32   d_secsize;              /* # of bytes per sector */
 511         __le32   d_part_start;           /* # of first sector of this partition */
 512         __le32   d_unknown1[12];         /* ? */
 513         __le32  d_alt_tbl;              /* byte offset of alternate table */
 514         __le32  d_alt_len;              /* byte length of alternate table */
 515         __le32  d_phys_cyl;             /* # of physical cylinders per device */
 516         __le32  d_phys_trk;             /* # of physical tracks per cylinder */
 517         __le32  d_phys_sec;             /* # of physical sectors per track */
 518         __le32  d_phys_bytes;           /* # of physical bytes per sector */
 519         __le32  d_unknown2;             /* ? */
 520         __le32   d_unknown3;             /* ? */
 521         __le32  d_pad[8];               /* pad */
 522
 523         struct unixware_vtoc {
 524                 __le32  v_magic;                /* the magic number */
 525                 __le32  v_version;              /* version number */
 526                 char    v_name[8];              /* volume name */
 527                 __le16  v_nslices;              /* # of slices */
 528                 __le16  v_unknown1;             /* ? */
 529                 __le32  v_reserved[10];         /* reserved */
 530                 struct unixware_slice
 531                         v_slice[UNIXWARE_NUMSLICE];     /* slice headers */
 532         } vtoc;
 533
 534 };  /* 408 */
 535
 536 #endif /* CONFIG_UNIXWARE_DISKLABEL */
 537
 538 #ifdef CONFIG_MINIX_SUBPARTITION
 539 #   define MINIX_NR_SUBPARTITIONS  4
 540 #endif /* CONFIG_MINIX_SUBPARTITION */
 541
 542 #ifdef __KERNEL__
 543
 544 #define ADDPART_FLAG_NONE       0
 545 #define ADDPART_FLAG_RAID       1
 546 #define ADDPART_FLAG_WHOLEDISK  2
 547
 548 extern dev_t blk_lookup_devt(const char *name);
 549 extern char *disk_name (struct gendisk *hd, int part, char *buf);
 550
 551 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
 552 extern void add_partition(struct gendisk *, int, sector_t, sector_t, int);
 553 extern void delete_partition(struct gendisk *, int);
 554 extern void printk_all_partitions(void);
 555
 556 extern struct gendisk *alloc_disk_node(int minors, int node_id);
 557 extern struct gendisk *alloc_disk(int minors);
 558 extern struct kobject *get_disk(struct gendisk *disk);
 559 extern void put_disk(struct gendisk *disk);
 560 extern void genhd_media_change_notify(struct gendisk *disk);
 561 extern void blk_register_region(dev_t devt, unsigned long range,
 562                         struct module *module,
 563                         struct kobject *(*probe)(dev_t, int *, void *),
 564                         int (*lock)(dev_t, void *),
 565                         void *data);
 566 extern void blk_unregister_region(dev_t devt, unsigned long range);
 567
 568 static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
 569 {
 570         return bdget(MKDEV(disk->major, disk->first_minor) + index);
 571 }
 572
 573 #endif
 574
 575 #else /* CONFIG_BLOCK */
 576
 577 static inline void printk_all_partitions(void) { }
 578
 579 static inline dev_t blk_lookup_devt(const char *name)
 580 {
 581         dev_t devt = MKDEV(0, 0);
 582         return devt;
 583 }
 584
 585 #endif /* CONFIG_BLOCK */
 586
 587 #endif