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