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