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 enum {
  26 /* These three have identical behaviour; use the second one if DOS FDISK gets
  27    confused about extended/logical partitions starting past cylinder 1023. */
  28         DOS_EXTENDED_PARTITION = 5,
  29         LINUX_EXTENDED_PARTITION = 0x85,
  30         WIN98_EXTENDED_PARTITION = 0x0f,
  31
  32         SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
  33
  34         LINUX_SWAP_PARTITION = 0x82,
  35         LINUX_DATA_PARTITION = 0x83,
  36         LINUX_LVM_PARTITION = 0x8e,
  37         LINUX_RAID_PARTITION = 0xfd,    /* autodetect RAID partition */
  38
  39         SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
  40         NEW_SOLARIS_X86_PARTITION = 0xbf,
  41
  42         DM6_AUX1PARTITION = 0x51,       /* no DDO:  use xlated geom */
  43         DM6_AUX3PARTITION = 0x53,       /* no DDO:  use xlated geom */
  44         DM6_PARTITION = 0x54,           /* has DDO: use xlated geom & offset */
  45         EZD_PARTITION = 0x55,           /* EZ-DRIVE */
  46
  47         FREEBSD_PARTITION = 0xa5,       /* FreeBSD Partition ID */
  48         OPENBSD_PARTITION = 0xa6,       /* OpenBSD Partition ID */
  49         NETBSD_PARTITION = 0xa9,        /* NetBSD Partition ID */
  50         BSDI_PARTITION = 0xb7,          /* BSDI Partition ID */
  51         MINIX_PARTITION = 0x81,         /* Minix Partition ID */
  52         UNIXWARE_PARTITION = 0x63,      /* Same as GNU_HURD and SCO Unix */
  53 };
  54
  55 #ifndef __KERNEL__
  56
  57 struct partition {
  58         unsigned char boot_ind;         /* 0x80 - active */
  59         unsigned char head;             /* starting head */
  60         unsigned char sector;           /* starting sector */
  61         unsigned char cyl;              /* starting cylinder */
  62         unsigned char sys_ind;          /* What partition type */
  63         unsigned char end_head;         /* end head */
  64         unsigned char end_sector;       /* end sector */
  65         unsigned char end_cyl;          /* end cylinder */
  66         unsigned int start_sect;        /* starting sector counting from 0 */
  67         unsigned int nr_sects;          /* nr of sectors in partition */
  68 } __attribute__((packed));
  69
  70 #endif
  71
  72 #ifdef __KERNEL__
  73 #include <linux/major.h>
  74 #include <linux/device.h>
  75 #include <linux/smp.h>
  76 #include <linux/string.h>
  77 #include <linux/fs.h>
  78 #include <linux/workqueue.h>
  79
  80 struct partition {
  81         unsigned char boot_ind;         /* 0x80 - active */
  82         unsigned char head;             /* starting head */
  83         unsigned char sector;           /* starting sector */
  84         unsigned char cyl;              /* starting cylinder */
  85         unsigned char sys_ind;          /* What partition type */
  86         unsigned char end_head;         /* end head */
  87         unsigned char end_sector;       /* end sector */
  88         unsigned char end_cyl;          /* end cylinder */
  89         __le32 start_sect;      /* starting sector counting from 0 */
  90         __le32 nr_sects;                /* nr of sectors in partition */
  91 } __attribute__((packed));
  92
  93 struct disk_stats {
  94         unsigned long sectors[2];       /* READs and WRITEs */
  95         unsigned long ios[2];
  96         unsigned long merges[2];
  97         unsigned long ticks[2];
  98         unsigned long io_ticks;
  99         unsigned long time_in_queue;
 100 };
 101
 102 struct hd_struct {
 103         sector_t start_sect;
 104         sector_t nr_sects;
 105         struct device dev;
 106         struct kobject *holder_dir;
 107         int policy, partno;
 108 #ifdef CONFIG_FAIL_MAKE_REQUEST
 109         int make_it_fail;
 110 #endif
 111         unsigned long stamp;
 112         int in_flight;
 113 #ifdef  CONFIG_SMP
 114         struct disk_stats *dkstats;
 115 #else
 116         struct disk_stats dkstats;
 117 #endif
 118 };
 119
 120 #define GENHD_FL_REMOVABLE                      1
 121 #define GENHD_FL_DRIVERFS                       2
 122 #define GENHD_FL_MEDIA_CHANGE_NOTIFY            4
 123 #define GENHD_FL_CD                             8
 124 #define GENHD_FL_UP                             16
 125 #define GENHD_FL_SUPPRESS_PARTITION_INFO        32
 126 #define GENHD_FL_FAIL                           64
 127
 128
 129 struct gendisk {
 130         int major;                      /* major number of driver */
 131         int first_minor;
 132         int minors;                     /* maximum number of minors, =1 for
 133                                          * disks that can't be partitioned. */
 134         char disk_name[32];             /* name of major driver */
 135         struct hd_struct **part;        /* [indexed by minor] */
 136         struct block_device_operations *fops;
 137         struct request_queue *queue;
 138         void *private_data;
 139         sector_t capacity;
 140
 141         int flags;
 142         struct device *driverfs_dev;  // FIXME: remove
 143         struct device dev;
 144         struct kobject *holder_dir;
 145         struct kobject *slave_dir;
 146
 147         struct timer_rand_state *random;
 148         int policy;
 149
 150         atomic_t sync_io;               /* RAID */
 151         unsigned long stamp;
 152         int in_flight;
 153 #ifdef  CONFIG_SMP
 154         struct disk_stats *dkstats;
 155 #else
 156         struct disk_stats dkstats;
 157 #endif
 158         struct work_struct async_notify;
 159 };
 160
 161 /*
 162  * Macros to operate on percpu disk statistics:
 163  *
 164  * The __ variants should only be called in critical sections. The full
 165  * variants disable/enable preemption.
 166  */
 167 static inline struct hd_struct *get_part(struct gendisk *gendiskp,
 168                                          sector_t sector)
 169 {
 170         struct hd_struct *part;
 171         int i;
 172         for (i = 0; i < gendiskp->minors - 1; i++) {
 173                 part = gendiskp->part[i];
 174                 if (part && part->start_sect <= sector
 175                     && sector < part->start_sect + part->nr_sects)
 176                         return part;
 177         }
 178         return NULL;
 179 }
 180
 181 #ifdef  CONFIG_SMP
 182 #define __disk_stat_add(gendiskp, field, addnd)         \
 183         (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
 184
 185 #define disk_stat_read(gendiskp, field)                                 \
 186 ({                                                                      \
 187         typeof(gendiskp->dkstats->field) res = 0;                       \
 188         int i;                                                          \
 189         for_each_possible_cpu(i)                                        \
 190                 res += per_cpu_ptr(gendiskp->dkstats, i)->field;        \
 191         res;                                                            \
 192 })
 193
 194 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)       {
 195         int i;
 196         for_each_possible_cpu(i)
 197                 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
 198                                 sizeof (struct disk_stats));
 199 }
 200
 201 #define __part_stat_add(part, field, addnd)                             \
 202         (per_cpu_ptr(part->dkstats, smp_processor_id())->field += addnd)
 203
 204 #define __all_stat_add(gendiskp, field, addnd, sector)          \
 205 ({                                                              \
 206         struct hd_struct *part = get_part(gendiskp, sector);    \
 207         if (part)                                               \
 208                 __part_stat_add(part, field, addnd);            \
 209         __disk_stat_add(gendiskp, field, addnd);                \
 210 })
 211
 212 #define part_stat_read(part, field)                                     \
 213 ({                                                                      \
 214         typeof(part->dkstats->field) res = 0;                           \
 215         int i;                                                          \
 216         for_each_possible_cpu(i)                                        \
 217                 res += per_cpu_ptr(part->dkstats, i)->field;            \
 218         res;                                                            \
 219 })
 220
 221 static inline void part_stat_set_all(struct hd_struct *part, int value) {
 222         int i;
 223         for_each_possible_cpu(i)
 224                 memset(per_cpu_ptr(part->dkstats, i), value,
 225                        sizeof(struct disk_stats));
 226 }
 227
 228 #else
 229 #define __disk_stat_add(gendiskp, field, addnd) \
 230                                 (gendiskp->dkstats.field += addnd)
 231 #define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
 232
 233 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
 234 {
 235         memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
 236 }
 237
 238 #define __part_stat_add(part, field, addnd) \
 239         (part->dkstats.field += addnd)
 240
 241 #define __all_stat_add(gendiskp, field, addnd, sector)          \
 242 ({                                                              \
 243         struct hd_struct *part = get_part(gendiskp, sector);    \
 244         if (part)                                               \
 245                 part->dkstats.field += addnd;                   \
 246         __disk_stat_add(gendiskp, field, addnd);                \
 247 })
 248
 249 #define part_stat_read(part, field)     (part->dkstats.field)
 250
 251 static inline void part_stat_set_all(struct hd_struct *part, int value)
 252 {
 253         memset(&part->dkstats, value, sizeof(struct disk_stats));
 254 }
 255
 256 #endif
 257
 258 #define disk_stat_add(gendiskp, field, addnd)                   \
 259         do {                                                    \
 260                 preempt_disable();                              \
 261                 __disk_stat_add(gendiskp, field, addnd);        \
 262                 preempt_enable();                               \
 263         } while (0)
 264
 265 #define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
 266 #define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
 267
 268 #define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
 269 #define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
 270
 271 #define __disk_stat_sub(gendiskp, field, subnd) \
 272                 __disk_stat_add(gendiskp, field, -subnd)
 273 #define disk_stat_sub(gendiskp, field, subnd) \
 274                 disk_stat_add(gendiskp, field, -subnd)
 275
 276 #define part_stat_add(gendiskp, field, addnd)           \
 277         do {                                            \
 278                 preempt_disable();                      \
 279                 __part_stat_add(gendiskp, field, addnd);\
 280                 preempt_enable();                       \
 281         } while (0)
 282
 283 #define __part_stat_dec(gendiskp, field) __part_stat_add(gendiskp, field, -1)
 284 #define part_stat_dec(gendiskp, field) part_stat_add(gendiskp, field, -1)
 285
 286 #define __part_stat_inc(gendiskp, field) __part_stat_add(gendiskp, field, 1)
 287 #define part_stat_inc(gendiskp, field) part_stat_add(gendiskp, field, 1)
 288
 289 #define __part_stat_sub(gendiskp, field, subnd) \
 290                 __part_stat_add(gendiskp, field, -subnd)
 291 #define part_stat_sub(gendiskp, field, subnd) \
 292                 part_stat_add(gendiskp, field, -subnd)
 293
 294 #define all_stat_add(gendiskp, field, addnd, sector)            \
 295         do {                                                    \
 296                 preempt_disable();                              \
 297                 __all_stat_add(gendiskp, field, addnd, sector); \
 298                 preempt_enable();                               \
 299         } while (0)
 300
 301 #define __all_stat_dec(gendiskp, field, sector) \
 302                 __all_stat_add(gendiskp, field, -1, sector)
 303 #define all_stat_dec(gendiskp, field, sector) \
 304                 all_stat_add(gendiskp, field, -1, sector)
 305
 306 #define __all_stat_inc(gendiskp, field, sector) \
 307                 __all_stat_add(gendiskp, field, 1, sector)
 308 #define all_stat_inc(gendiskp, field, sector) \
 309                 all_stat_add(gendiskp, field, 1, sector)
 310
 311 #define __all_stat_sub(gendiskp, field, subnd, sector) \
 312                 __all_stat_add(gendiskp, field, -subnd, sector)
 313 #define all_stat_sub(gendiskp, field, subnd, sector) \
 314                 all_stat_add(gendiskp, field, -subnd, sector)
 315
 316 /* Inlines to alloc and free disk stats in struct gendisk */
 317 #ifdef  CONFIG_SMP
 318 static inline int init_disk_stats(struct gendisk *disk)
 319 {
 320         disk->dkstats = alloc_percpu(struct disk_stats);
 321         if (!disk->dkstats)
 322                 return 0;
 323         return 1;
 324 }
 325
 326 static inline void free_disk_stats(struct gendisk *disk)
 327 {
 328         free_percpu(disk->dkstats);
 329 }
 330
 331 static inline int init_part_stats(struct hd_struct *part)
 332 {
 333         part->dkstats = alloc_percpu(struct disk_stats);
 334         if (!part->dkstats)
 335                 return 0;
 336         return 1;
 337 }
 338
 339 static inline void free_part_stats(struct hd_struct *part)
 340 {
 341         free_percpu(part->dkstats);
 342 }
 343
 344 #else   /* CONFIG_SMP */
 345 static inline int init_disk_stats(struct gendisk *disk)
 346 {
 347         return 1;
 348 }
 349
 350 static inline void free_disk_stats(struct gendisk *disk)
 351 {
 352 }
 353
 354 static inline int init_part_stats(struct hd_struct *part)
 355 {
 356         return 1;
 357 }
 358
 359 static inline void free_part_stats(struct hd_struct *part)
 360 {
 361 }
 362 #endif  /* CONFIG_SMP */
 363
 364 /* drivers/block/ll_rw_blk.c */
 365 extern void disk_round_stats(struct gendisk *disk);
 366 extern void part_round_stats(struct hd_struct *part);
 367
 368 /* drivers/block/genhd.c */
 369 extern int get_blkdev_list(char *, int);
 370 extern void add_disk(struct gendisk *disk);
 371 extern void del_gendisk(struct gendisk *gp);
 372 extern void unlink_gendisk(struct gendisk *gp);
 373 extern struct gendisk *get_gendisk(dev_t dev, int *part);
 374
 375 extern void set_device_ro(struct block_device *bdev, int flag);
 376 extern void set_disk_ro(struct gendisk *disk, int flag);
 377
 378 /* drivers/char/random.c */
 379 extern void add_disk_randomness(struct gendisk *disk);
 380 extern void rand_initialize_disk(struct gendisk *disk);
 381
 382 static inline sector_t get_start_sect(struct block_device *bdev)
 383 {
 384         return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
 385 }
 386 static inline sector_t get_capacity(struct gendisk *disk)
 387 {
 388         return disk->capacity;
 389 }
 390 static inline void set_capacity(struct gendisk *disk, sector_t size)
 391 {
 392         disk->capacity = size;
 393 }
 394
 395 #endif  /*  __KERNEL__  */
 396
 397 #ifdef CONFIG_SOLARIS_X86_PARTITION
 398
 399 #define SOLARIS_X86_NUMSLICE    16
 400 #define SOLARIS_X86_VTOC_SANE   (0x600DDEEEUL)
 401
 402 struct solaris_x86_slice {
 403         __le16 s_tag;           /* ID tag of partition */
 404         __le16 s_flag;          /* permission flags */
 405         __le32 s_start;         /* start sector no of partition */
 406         __le32 s_size;          /* # of blocks in partition */
 407 };
 408
 409 struct solaris_x86_vtoc {
 410         unsigned int v_bootinfo[3];     /* info needed by mboot (unsupported) */
 411         __le32 v_sanity;                /* to verify vtoc sanity */
 412         __le32 v_version;               /* layout version */
 413         char    v_volume[8];            /* volume name */
 414         __le16  v_sectorsz;             /* sector size in bytes */
 415         __le16  v_nparts;               /* number of partitions */
 416         unsigned int v_reserved[10];    /* free space */
 417         struct solaris_x86_slice
 418                 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
 419         unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
 420         char    v_asciilabel[128];      /* for compatibility */
 421 };
 422
 423 #endif /* CONFIG_SOLARIS_X86_PARTITION */
 424
 425 #ifdef CONFIG_BSD_DISKLABEL
 426 /*
 427  * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
 428  * updated by Marc Espie <Marc.Espie@openbsd.org>
 429  */
 430
 431 /* check against BSD src/sys/sys/disklabel.h for consistency */
 432
 433 #define BSD_DISKMAGIC   (0x82564557UL)  /* The disk magic number */
 434 #define BSD_MAXPARTITIONS       16
 435 #define OPENBSD_MAXPARTITIONS   16
 436 #define BSD_FS_UNUSED           0       /* disklabel unused partition entry ID */
 437 struct bsd_disklabel {
 438         __le32  d_magic;                /* the magic number */
 439         __s16   d_type;                 /* drive type */
 440         __s16   d_subtype;              /* controller/d_type specific */
 441         char    d_typename[16];         /* type name, e.g. "eagle" */
 442         char    d_packname[16];                 /* pack identifier */
 443         __u32   d_secsize;              /* # of bytes per sector */
 444         __u32   d_nsectors;             /* # of data sectors per track */
 445         __u32   d_ntracks;              /* # of tracks per cylinder */
 446         __u32   d_ncylinders;           /* # of data cylinders per unit */
 447         __u32   d_secpercyl;            /* # of data sectors per cylinder */
 448         __u32   d_secperunit;           /* # of data sectors per unit */
 449         __u16   d_sparespertrack;       /* # of spare sectors per track */
 450         __u16   d_sparespercyl;         /* # of spare sectors per cylinder */
 451         __u32   d_acylinders;           /* # of alt. cylinders per unit */
 452         __u16   d_rpm;                  /* rotational speed */
 453         __u16   d_interleave;           /* hardware sector interleave */
 454         __u16   d_trackskew;            /* sector 0 skew, per track */
 455         __u16   d_cylskew;              /* sector 0 skew, per cylinder */
 456         __u32   d_headswitch;           /* head switch time, usec */
 457         __u32   d_trkseek;              /* track-to-track seek, usec */
 458         __u32   d_flags;                /* generic flags */
 459 #define NDDATA 5
 460         __u32   d_drivedata[NDDATA];    /* drive-type specific information */
 461 #define NSPARE 5
 462         __u32   d_spare[NSPARE];        /* reserved for future use */
 463         __le32  d_magic2;               /* the magic number (again) */
 464         __le16  d_checksum;             /* xor of data incl. partitions */
 465
 466                         /* filesystem and partition information: */
 467         __le16  d_npartitions;          /* number of partitions in following */
 468         __le32  d_bbsize;               /* size of boot area at sn0, bytes */
 469         __le32  d_sbsize;               /* max size of fs superblock, bytes */
 470         struct  bsd_partition {         /* the partition table */
 471                 __le32  p_size;         /* number of sectors in partition */
 472                 __le32  p_offset;       /* starting sector */
 473                 __le32  p_fsize;        /* filesystem basic fragment size */
 474                 __u8    p_fstype;       /* filesystem type, see below */
 475                 __u8    p_frag;         /* filesystem fragments per block */
 476                 __le16  p_cpg;          /* filesystem cylinders per group */
 477         } d_partitions[BSD_MAXPARTITIONS];      /* actually may be more */
 478 };
 479
 480 #endif  /* CONFIG_BSD_DISKLABEL */
 481
 482 #ifdef CONFIG_UNIXWARE_DISKLABEL
 483 /*
 484  * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
 485  * and Krzysztof G. Baranowski <kgb@knm.org.pl>
 486  */
 487
 488 #define UNIXWARE_DISKMAGIC     (0xCA5E600DUL)   /* The disk magic number */
 489 #define UNIXWARE_DISKMAGIC2    (0x600DDEEEUL)   /* The slice table magic nr */
 490 #define UNIXWARE_NUMSLICE      16
 491 #define UNIXWARE_FS_UNUSED     0                /* Unused slice entry ID */
 492
 493 struct unixware_slice {
 494         __le16   s_label;       /* label */
 495         __le16   s_flags;       /* permission flags */
 496         __le32   start_sect;    /* starting sector */
 497         __le32   nr_sects;      /* number of sectors in slice */
 498 };
 499
 500 struct unixware_disklabel {
 501         __le32   d_type;                /* drive type */
 502         __le32   d_magic;                /* the magic number */
 503         __le32   d_version;              /* version number */
 504         char    d_serial[12];           /* serial number of the device */
 505         __le32   d_ncylinders;           /* # of data cylinders per device */
 506         __le32   d_ntracks;              /* # of tracks per cylinder */
 507         __le32   d_nsectors;             /* # of data sectors per track */
 508         __le32   d_secsize;              /* # of bytes per sector */
 509         __le32   d_part_start;           /* # of first sector of this partition */
 510         __le32   d_unknown1[12];         /* ? */
 511         __le32  d_alt_tbl;              /* byte offset of alternate table */
 512         __le32  d_alt_len;              /* byte length of alternate table */
 513         __le32  d_phys_cyl;             /* # of physical cylinders per device */
 514         __le32  d_phys_trk;             /* # of physical tracks per cylinder */
 515         __le32  d_phys_sec;             /* # of physical sectors per track */
 516         __le32  d_phys_bytes;           /* # of physical bytes per sector */
 517         __le32  d_unknown2;             /* ? */
 518         __le32   d_unknown3;             /* ? */
 519         __le32  d_pad[8];               /* pad */
 520
 521         struct unixware_vtoc {
 522                 __le32  v_magic;                /* the magic number */
 523                 __le32  v_version;              /* version number */
 524                 char    v_name[8];              /* volume name */
 525                 __le16  v_nslices;              /* # of slices */
 526                 __le16  v_unknown1;             /* ? */
 527                 __le32  v_reserved[10];         /* reserved */
 528                 struct unixware_slice
 529                         v_slice[UNIXWARE_NUMSLICE];     /* slice headers */
 530         } vtoc;
 531
 532 };  /* 408 */
 533
 534 #endif /* CONFIG_UNIXWARE_DISKLABEL */
 535
 536 #ifdef CONFIG_MINIX_SUBPARTITION
 537 #   define MINIX_NR_SUBPARTITIONS  4
 538 #endif /* CONFIG_MINIX_SUBPARTITION */
 539
 540 #ifdef __KERNEL__
 541
 542 #define ADDPART_FLAG_NONE       0
 543 #define ADDPART_FLAG_RAID       1
 544 #define ADDPART_FLAG_WHOLEDISK  2
 545
 546 extern dev_t blk_lookup_devt(const char *name);
 547 extern char *disk_name (struct gendisk *hd, int part, char *buf);
 548
 549 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
 550 extern void add_partition(struct gendisk *, int, sector_t, sector_t, int);
 551 extern void delete_partition(struct gendisk *, int);
 552 extern void printk_all_partitions(void);
 553
 554 extern struct gendisk *alloc_disk_node(int minors, int node_id);
 555 extern struct gendisk *alloc_disk(int minors);
 556 extern struct kobject *get_disk(struct gendisk *disk);
 557 extern void put_disk(struct gendisk *disk);
 558 extern void blk_register_region(dev_t devt, unsigned long range,
 559                         struct module *module,
 560                         struct kobject *(*probe)(dev_t, int *, void *),
 561                         int (*lock)(dev_t, void *),
 562                         void *data);
 563 extern void blk_unregister_region(dev_t devt, unsigned long range);
 564
 565 static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
 566 {
 567         return bdget(MKDEV(disk->major, disk->first_minor) + index);
 568 }
 569
 570 #endif
 571
 572 #else /* CONFIG_BLOCK */
 573
 574 static inline void printk_all_partitions(void) { }
 575
 576 static inline dev_t blk_lookup_devt(const char *name)
 577 {
 578         dev_t devt = MKDEV(0, 0);
 579         return devt;
 580 }
 581
 582 #endif /* CONFIG_BLOCK */
 583
 584 #endif