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 part_type;
  22 extern struct kobject *block_depr;
  23 extern struct class block_class;
  24
  25 extern const struct seq_operations partitions_op;
  26 extern const struct seq_operations diskstats_op;
  27
  28 enum {
  29 /* These three have identical behaviour; use the second one if DOS FDISK gets
  30    confused about extended/logical partitions starting past cylinder 1023. */
  31         DOS_EXTENDED_PARTITION = 5,
  32         LINUX_EXTENDED_PARTITION = 0x85,
  33         WIN98_EXTENDED_PARTITION = 0x0f,
  34
  35         SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
  36
  37         LINUX_SWAP_PARTITION = 0x82,
  38         LINUX_DATA_PARTITION = 0x83,
  39         LINUX_LVM_PARTITION = 0x8e,
  40         LINUX_RAID_PARTITION = 0xfd,    /* autodetect RAID partition */
  41
  42         SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
  43         NEW_SOLARIS_X86_PARTITION = 0xbf,
  44
  45         DM6_AUX1PARTITION = 0x51,       /* no DDO:  use xlated geom */
  46         DM6_AUX3PARTITION = 0x53,       /* no DDO:  use xlated geom */
  47         DM6_PARTITION = 0x54,           /* has DDO: use xlated geom & offset */
  48         EZD_PARTITION = 0x55,           /* EZ-DRIVE */
  49
  50         FREEBSD_PARTITION = 0xa5,       /* FreeBSD Partition ID */
  51         OPENBSD_PARTITION = 0xa6,       /* OpenBSD Partition ID */
  52         NETBSD_PARTITION = 0xa9,        /* NetBSD Partition ID */
  53         BSDI_PARTITION = 0xb7,          /* BSDI Partition ID */
  54         MINIX_PARTITION = 0x81,         /* Minix Partition ID */
  55         UNIXWARE_PARTITION = 0x63,      /* Same as GNU_HURD and SCO Unix */
  56 };
  57
  58 #ifndef __KERNEL__
  59
  60 struct partition {
  61         unsigned char boot_ind;         /* 0x80 - active */
  62         unsigned char head;             /* starting head */
  63         unsigned char sector;           /* starting sector */
  64         unsigned char cyl;              /* starting cylinder */
  65         unsigned char sys_ind;          /* What partition type */
  66         unsigned char end_head;         /* end head */
  67         unsigned char end_sector;       /* end sector */
  68         unsigned char end_cyl;          /* end cylinder */
  69         unsigned int start_sect;        /* starting sector counting from 0 */
  70         unsigned int nr_sects;          /* nr of sectors in partition */
  71 } __attribute__((packed));
  72
  73 #endif
  74
  75 #ifdef __KERNEL__
  76 #include <linux/major.h>
  77 #include <linux/device.h>
  78 #include <linux/smp.h>
  79 #include <linux/string.h>
  80 #include <linux/fs.h>
  81 #include <linux/workqueue.h>
  82
  83 struct partition {
  84         unsigned char boot_ind;         /* 0x80 - active */
  85         unsigned char head;             /* starting head */
  86         unsigned char sector;           /* starting sector */
  87         unsigned char cyl;              /* starting cylinder */
  88         unsigned char sys_ind;          /* What partition type */
  89         unsigned char end_head;         /* end head */
  90         unsigned char end_sector;       /* end sector */
  91         unsigned char end_cyl;          /* end cylinder */
  92         __le32 start_sect;      /* starting sector counting from 0 */
  93         __le32 nr_sects;                /* nr of sectors in partition */
  94 } __attribute__((packed));
  95
  96 struct disk_stats {
  97         unsigned long sectors[2];       /* READs and WRITEs */
  98         unsigned long ios[2];
  99         unsigned long merges[2];
 100         unsigned long ticks[2];
 101         unsigned long io_ticks;
 102         unsigned long time_in_queue;
 103 };
 104
 105 struct hd_struct {
 106         sector_t start_sect;
 107         sector_t nr_sects;
 108         struct device dev;
 109         struct kobject *holder_dir;
 110         int policy, partno;
 111 #ifdef CONFIG_FAIL_MAKE_REQUEST
 112         int make_it_fail;
 113 #endif
 114         unsigned long stamp;
 115         int in_flight;
 116 #ifdef  CONFIG_SMP
 117         struct disk_stats *dkstats;
 118 #else
 119         struct disk_stats dkstats;
 120 #endif
 121 };
 122
 123 #define GENHD_FL_REMOVABLE                      1
 124 #define GENHD_FL_DRIVERFS                       2
 125 #define GENHD_FL_MEDIA_CHANGE_NOTIFY            4
 126 #define GENHD_FL_CD                             8
 127 #define GENHD_FL_UP                             16
 128 #define GENHD_FL_SUPPRESS_PARTITION_INFO        32
 129 #define GENHD_FL_FAIL                           64
 130
 131
 132 struct gendisk {
 133         int major;                      /* major number of driver */
 134         int first_minor;
 135         int minors;                     /* maximum number of minors, =1 for
 136                                          * disks that can't be partitioned. */
 137         char disk_name[32];             /* name of major driver */
 138         struct hd_struct **part;        /* [indexed by minor] */
 139         struct block_device_operations *fops;
 140         struct request_queue *queue;
 141         void *private_data;
 142         sector_t capacity;
 143
 144         int flags;
 145         struct device *driverfs_dev;  // FIXME: remove
 146         struct device dev;
 147         struct kobject *holder_dir;
 148         struct kobject *slave_dir;
 149
 150         struct timer_rand_state *random;
 151         int policy;
 152
 153         atomic_t sync_io;               /* RAID */
 154         unsigned long stamp;
 155         int in_flight;
 156 #ifdef  CONFIG_SMP
 157         struct disk_stats *dkstats;
 158 #else
 159         struct disk_stats dkstats;
 160 #endif
 161         struct work_struct async_notify;
 162 };
 163
 164 /*
 165  * Macros to operate on percpu disk statistics:
 166  *
 167  * The __ variants should only be called in critical sections. The full
 168  * variants disable/enable preemption.
 169  */
 170 static inline struct hd_struct *get_part(struct gendisk *gendiskp,
 171                                          sector_t sector)
 172 {
 173         struct hd_struct *part;
 174         int i;
 175         for (i = 0; i < gendiskp->minors - 1; i++) {
 176                 part = gendiskp->part[i];
 177                 if (part && part->start_sect <= sector
 178                     && sector < part->start_sect + part->nr_sects)
 179                         return part;
 180         }
 181         return NULL;
 182 }
 183
 184 #ifdef  CONFIG_SMP
 185 #define __disk_stat_add(gendiskp, field, addnd)         \
 186         (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
 187
 188 #define disk_stat_read(gendiskp, field)                                 \
 189 ({                                                                      \
 190         typeof(gendiskp->dkstats->field) res = 0;                       \
 191         int i;                                                          \
 192         for_each_possible_cpu(i)                                        \
 193                 res += per_cpu_ptr(gendiskp->dkstats, i)->field;        \
 194         res;                                                            \
 195 })
 196
 197 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)       {
 198         int i;
 199         for_each_possible_cpu(i)
 200                 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
 201                                 sizeof (struct disk_stats));
 202 }
 203
 204 #define __part_stat_add(part, field, addnd)                             \
 205         (per_cpu_ptr(part->dkstats, smp_processor_id())->field += addnd)
 206
 207 #define __all_stat_add(gendiskp, field, addnd, sector)          \
 208 ({                                                              \
 209         struct hd_struct *part = get_part(gendiskp, sector);    \
 210         if (part)                                               \
 211                 __part_stat_add(part, field, addnd);            \
 212         __disk_stat_add(gendiskp, field, addnd);                \
 213 })
 214
 215 #define part_stat_read(part, field)                                     \
 216 ({                                                                      \
 217         typeof(part->dkstats->field) res = 0;                           \
 218         int i;                                                          \
 219         for_each_possible_cpu(i)                                        \
 220                 res += per_cpu_ptr(part->dkstats, i)->field;            \
 221         res;                                                            \
 222 })
 223
 224 static inline void part_stat_set_all(struct hd_struct *part, int value) {
 225         int i;
 226         for_each_possible_cpu(i)
 227                 memset(per_cpu_ptr(part->dkstats, i), value,
 228                        sizeof(struct disk_stats));
 229 }
 230
 231 #else
 232 #define __disk_stat_add(gendiskp, field, addnd) \
 233                                 (gendiskp->dkstats.field += addnd)
 234 #define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
 235
 236 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
 237 {
 238         memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
 239 }
 240
 241 #define __part_stat_add(part, field, addnd) \
 242         (part->dkstats.field += addnd)
 243
 244 #define __all_stat_add(gendiskp, field, addnd, sector)          \
 245 ({                                                              \
 246         struct hd_struct *part = get_part(gendiskp, sector);    \
 247         if (part)                                               \
 248                 part->dkstats.field += addnd;                   \
 249         __disk_stat_add(gendiskp, field, addnd);                \
 250 })
 251
 252 #define part_stat_read(part, field)     (part->dkstats.field)
 253
 254 static inline void part_stat_set_all(struct hd_struct *part, int value)
 255 {
 256         memset(&part->dkstats, value, sizeof(struct disk_stats));
 257 }
 258
 259 #endif
 260
 261 #define disk_stat_add(gendiskp, field, addnd)                   \
 262         do {                                                    \
 263                 preempt_disable();                              \
 264                 __disk_stat_add(gendiskp, field, addnd);        \
 265                 preempt_enable();                               \
 266         } while (0)
 267
 268 #define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
 269 #define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
 270
 271 #define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
 272 #define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
 273
 274 #define __disk_stat_sub(gendiskp, field, subnd) \
 275                 __disk_stat_add(gendiskp, field, -subnd)
 276 #define disk_stat_sub(gendiskp, field, subnd) \
 277                 disk_stat_add(gendiskp, field, -subnd)
 278
 279 #define part_stat_add(gendiskp, field, addnd)           \
 280         do {                                            \
 281                 preempt_disable();                      \
 282                 __part_stat_add(gendiskp, field, addnd);\
 283                 preempt_enable();                       \
 284         } while (0)
 285
 286 #define __part_stat_dec(gendiskp, field) __part_stat_add(gendiskp, field, -1)
 287 #define part_stat_dec(gendiskp, field) part_stat_add(gendiskp, field, -1)
 288
 289 #define __part_stat_inc(gendiskp, field) __part_stat_add(gendiskp, field, 1)
 290 #define part_stat_inc(gendiskp, field) part_stat_add(gendiskp, field, 1)
 291
 292 #define __part_stat_sub(gendiskp, field, subnd) \
 293                 __part_stat_add(gendiskp, field, -subnd)
 294 #define part_stat_sub(gendiskp, field, subnd) \
 295                 part_stat_add(gendiskp, field, -subnd)
 296
 297 #define all_stat_add(gendiskp, field, addnd, sector)            \
 298         do {                                                    \
 299                 preempt_disable();                              \
 300                 __all_stat_add(gendiskp, field, addnd, sector); \
 301                 preempt_enable();                               \
 302         } while (0)
 303
 304 #define __all_stat_dec(gendiskp, field, sector) \
 305                 __all_stat_add(gendiskp, field, -1, sector)
 306 #define all_stat_dec(gendiskp, field, sector) \
 307                 all_stat_add(gendiskp, field, -1, sector)
 308
 309 #define __all_stat_inc(gendiskp, field, sector) \
 310                 __all_stat_add(gendiskp, field, 1, sector)
 311 #define all_stat_inc(gendiskp, field, sector) \
 312                 all_stat_add(gendiskp, field, 1, sector)
 313
 314 #define __all_stat_sub(gendiskp, field, subnd, sector) \
 315                 __all_stat_add(gendiskp, field, -subnd, sector)
 316 #define all_stat_sub(gendiskp, field, subnd, sector) \
 317                 all_stat_add(gendiskp, field, -subnd, sector)
 318
 319 /* Inlines to alloc and free disk stats in struct gendisk */
 320 #ifdef  CONFIG_SMP
 321 static inline int init_disk_stats(struct gendisk *disk)
 322 {
 323         disk->dkstats = alloc_percpu(struct disk_stats);
 324         if (!disk->dkstats)
 325                 return 0;
 326         return 1;
 327 }
 328
 329 static inline void free_disk_stats(struct gendisk *disk)
 330 {
 331         free_percpu(disk->dkstats);
 332 }
 333
 334 static inline int init_part_stats(struct hd_struct *part)
 335 {
 336         part->dkstats = alloc_percpu(struct disk_stats);
 337         if (!part->dkstats)
 338                 return 0;
 339         return 1;
 340 }
 341
 342 static inline void free_part_stats(struct hd_struct *part)
 343 {
 344         free_percpu(part->dkstats);
 345 }
 346
 347 #else   /* CONFIG_SMP */
 348 static inline int init_disk_stats(struct gendisk *disk)
 349 {
 350         return 1;
 351 }
 352
 353 static inline void free_disk_stats(struct gendisk *disk)
 354 {
 355 }
 356
 357 static inline int init_part_stats(struct hd_struct *part)
 358 {
 359         return 1;
 360 }
 361
 362 static inline void free_part_stats(struct hd_struct *part)
 363 {
 364 }
 365 #endif  /* CONFIG_SMP */
 366
 367 /* drivers/block/ll_rw_blk.c */
 368 extern void disk_round_stats(struct gendisk *disk);
 369 extern void part_round_stats(struct hd_struct *part);
 370
 371 /* drivers/block/genhd.c */
 372 extern int get_blkdev_list(char *, int);
 373 extern void add_disk(struct gendisk *disk);
 374 extern void del_gendisk(struct gendisk *gp);
 375 extern void unlink_gendisk(struct gendisk *gp);
 376 extern struct gendisk *get_gendisk(dev_t dev, int *part);
 377
 378 extern void set_device_ro(struct block_device *bdev, int flag);
 379 extern void set_disk_ro(struct gendisk *disk, int flag);
 380
 381 /* drivers/char/random.c */
 382 extern void add_disk_randomness(struct gendisk *disk);
 383 extern void rand_initialize_disk(struct gendisk *disk);
 384
 385 static inline sector_t get_start_sect(struct block_device *bdev)
 386 {
 387         return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
 388 }
 389 static inline sector_t get_capacity(struct gendisk *disk)
 390 {
 391         return disk->capacity;
 392 }
 393 static inline void set_capacity(struct gendisk *disk, sector_t size)
 394 {
 395         disk->capacity = size;
 396 }
 397
 398 #endif  /*  __KERNEL__  */
 399
 400 #ifdef CONFIG_SOLARIS_X86_PARTITION
 401
 402 #define SOLARIS_X86_NUMSLICE    16
 403 #define SOLARIS_X86_VTOC_SANE   (0x600DDEEEUL)
 404
 405 struct solaris_x86_slice {
 406         __le16 s_tag;           /* ID tag of partition */
 407         __le16 s_flag;          /* permission flags */
 408         __le32 s_start;         /* start sector no of partition */
 409         __le32 s_size;          /* # of blocks in partition */
 410 };
 411
 412 struct solaris_x86_vtoc {
 413         unsigned int v_bootinfo[3];     /* info needed by mboot (unsupported) */
 414         __le32 v_sanity;                /* to verify vtoc sanity */
 415         __le32 v_version;               /* layout version */
 416         char    v_volume[8];            /* volume name */
 417         __le16  v_sectorsz;             /* sector size in bytes */
 418         __le16  v_nparts;               /* number of partitions */
 419         unsigned int v_reserved[10];    /* free space */
 420         struct solaris_x86_slice
 421                 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
 422         unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
 423         char    v_asciilabel[128];      /* for compatibility */
 424 };
 425
 426 #endif /* CONFIG_SOLARIS_X86_PARTITION */
 427
 428 #ifdef CONFIG_BSD_DISKLABEL
 429 /*
 430  * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
 431  * updated by Marc Espie <Marc.Espie@openbsd.org>
 432  */
 433
 434 /* check against BSD src/sys/sys/disklabel.h for consistency */
 435
 436 #define BSD_DISKMAGIC   (0x82564557UL)  /* The disk magic number */
 437 #define BSD_MAXPARTITIONS       16
 438 #define OPENBSD_MAXPARTITIONS   16
 439 #define BSD_FS_UNUSED           0       /* disklabel unused partition entry ID */
 440 struct bsd_disklabel {
 441         __le32  d_magic;                /* the magic number */
 442         __s16   d_type;                 /* drive type */
 443         __s16   d_subtype;              /* controller/d_type specific */
 444         char    d_typename[16];         /* type name, e.g. "eagle" */
 445         char    d_packname[16];                 /* pack identifier */
 446         __u32   d_secsize;              /* # of bytes per sector */
 447         __u32   d_nsectors;             /* # of data sectors per track */
 448         __u32   d_ntracks;              /* # of tracks per cylinder */
 449         __u32   d_ncylinders;           /* # of data cylinders per unit */
 450         __u32   d_secpercyl;            /* # of data sectors per cylinder */
 451         __u32   d_secperunit;           /* # of data sectors per unit */
 452         __u16   d_sparespertrack;       /* # of spare sectors per track */
 453         __u16   d_sparespercyl;         /* # of spare sectors per cylinder */
 454         __u32   d_acylinders;           /* # of alt. cylinders per unit */
 455         __u16   d_rpm;                  /* rotational speed */
 456         __u16   d_interleave;           /* hardware sector interleave */
 457         __u16   d_trackskew;            /* sector 0 skew, per track */
 458         __u16   d_cylskew;              /* sector 0 skew, per cylinder */
 459         __u32   d_headswitch;           /* head switch time, usec */
 460         __u32   d_trkseek;              /* track-to-track seek, usec */
 461         __u32   d_flags;                /* generic flags */
 462 #define NDDATA 5
 463         __u32   d_drivedata[NDDATA];    /* drive-type specific information */
 464 #define NSPARE 5
 465         __u32   d_spare[NSPARE];        /* reserved for future use */
 466         __le32  d_magic2;               /* the magic number (again) */
 467         __le16  d_checksum;             /* xor of data incl. partitions */
 468
 469                         /* filesystem and partition information: */
 470         __le16  d_npartitions;          /* number of partitions in following */
 471         __le32  d_bbsize;               /* size of boot area at sn0, bytes */
 472         __le32  d_sbsize;               /* max size of fs superblock, bytes */
 473         struct  bsd_partition {         /* the partition table */
 474                 __le32  p_size;         /* number of sectors in partition */
 475                 __le32  p_offset;       /* starting sector */
 476                 __le32  p_fsize;        /* filesystem basic fragment size */
 477                 __u8    p_fstype;       /* filesystem type, see below */
 478                 __u8    p_frag;         /* filesystem fragments per block */
 479                 __le16  p_cpg;          /* filesystem cylinders per group */
 480         } d_partitions[BSD_MAXPARTITIONS];      /* actually may be more */
 481 };
 482
 483 #endif  /* CONFIG_BSD_DISKLABEL */
 484
 485 #ifdef CONFIG_UNIXWARE_DISKLABEL
 486 /*
 487  * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
 488  * and Krzysztof G. Baranowski <kgb@knm.org.pl>
 489  */
 490
 491 #define UNIXWARE_DISKMAGIC     (0xCA5E600DUL)   /* The disk magic number */
 492 #define UNIXWARE_DISKMAGIC2    (0x600DDEEEUL)   /* The slice table magic nr */
 493 #define UNIXWARE_NUMSLICE      16
 494 #define UNIXWARE_FS_UNUSED     0                /* Unused slice entry ID */
 495
 496 struct unixware_slice {
 497         __le16   s_label;       /* label */
 498         __le16   s_flags;       /* permission flags */
 499         __le32   start_sect;    /* starting sector */
 500         __le32   nr_sects;      /* number of sectors in slice */
 501 };
 502
 503 struct unixware_disklabel {
 504         __le32   d_type;                /* drive type */
 505         __le32   d_magic;                /* the magic number */
 506         __le32   d_version;              /* version number */
 507         char    d_serial[12];           /* serial number of the device */
 508         __le32   d_ncylinders;           /* # of data cylinders per device */
 509         __le32   d_ntracks;              /* # of tracks per cylinder */
 510         __le32   d_nsectors;             /* # of data sectors per track */
 511         __le32   d_secsize;              /* # of bytes per sector */
 512         __le32   d_part_start;           /* # of first sector of this partition */
 513         __le32   d_unknown1[12];         /* ? */
 514         __le32  d_alt_tbl;              /* byte offset of alternate table */
 515         __le32  d_alt_len;              /* byte length of alternate table */
 516         __le32  d_phys_cyl;             /* # of physical cylinders per device */
 517         __le32  d_phys_trk;             /* # of physical tracks per cylinder */
 518         __le32  d_phys_sec;             /* # of physical sectors per track */
 519         __le32  d_phys_bytes;           /* # of physical bytes per sector */
 520         __le32  d_unknown2;             /* ? */
 521         __le32   d_unknown3;             /* ? */
 522         __le32  d_pad[8];               /* pad */
 523
 524         struct unixware_vtoc {
 525                 __le32  v_magic;                /* the magic number */
 526                 __le32  v_version;              /* version number */
 527                 char    v_name[8];              /* volume name */
 528                 __le16  v_nslices;              /* # of slices */
 529                 __le16  v_unknown1;             /* ? */
 530                 __le32  v_reserved[10];         /* reserved */
 531                 struct unixware_slice
 532                         v_slice[UNIXWARE_NUMSLICE];     /* slice headers */
 533         } vtoc;
 534
 535 };  /* 408 */
 536
 537 #endif /* CONFIG_UNIXWARE_DISKLABEL */
 538
 539 #ifdef CONFIG_MINIX_SUBPARTITION
 540 #   define MINIX_NR_SUBPARTITIONS  4
 541 #endif /* CONFIG_MINIX_SUBPARTITION */
 542
 543 #ifdef __KERNEL__
 544
 545 #define ADDPART_FLAG_NONE       0
 546 #define ADDPART_FLAG_RAID       1
 547 #define ADDPART_FLAG_WHOLEDISK  2
 548
 549 extern dev_t blk_lookup_devt(const char *name);
 550 extern char *disk_name (struct gendisk *hd, int part, char *buf);
 551
 552 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
 553 extern void add_partition(struct gendisk *, int, sector_t, sector_t, int);
 554 extern void delete_partition(struct gendisk *, int);
 555 extern void printk_all_partitions(void);
 556
 557 extern struct gendisk *alloc_disk_node(int minors, int node_id);
 558 extern struct gendisk *alloc_disk(int minors);
 559 extern struct kobject *get_disk(struct gendisk *disk);
 560 extern void put_disk(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