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 #include <linux/rcupdate.h>
  15
  16 #ifdef CONFIG_BLOCK
  17
  18 #define kobj_to_dev(k)          container_of((k), struct device, kobj)
  19 #define dev_to_disk(device)     container_of((device), struct gendisk, part0.__dev)
  20 #define dev_to_part(device)     container_of((device), struct hd_struct, __dev)
  21 #define disk_to_dev(disk)       (&(disk)->part0.__dev)
  22 #define part_to_dev(part)       (&((part)->__dev))
  23
  24 extern struct device_type part_type;
  25 extern struct kobject *block_depr;
  26 extern struct class block_class;
  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 #define DISK_MAX_PARTS                  256
  59 #define DISK_NAME_LEN                   32
  60
  61 #include <linux/major.h>
  62 #include <linux/device.h>
  63 #include <linux/smp.h>
  64 #include <linux/string.h>
  65 #include <linux/fs.h>
  66 #include <linux/workqueue.h>
  67
  68 struct partition {
  69         unsigned char boot_ind;         /* 0x80 - active */
  70         unsigned char head;             /* starting head */
  71         unsigned char sector;           /* starting sector */
  72         unsigned char cyl;              /* starting cylinder */
  73         unsigned char sys_ind;          /* What partition type */
  74         unsigned char end_head;         /* end head */
  75         unsigned char end_sector;       /* end sector */
  76         unsigned char end_cyl;          /* end cylinder */
  77         __le32 start_sect;      /* starting sector counting from 0 */
  78         __le32 nr_sects;                /* nr of sectors in partition */
  79 } __attribute__((packed));
  80
  81 struct disk_stats {
  82         unsigned long sectors[2];       /* READs and WRITEs */
  83         unsigned long ios[2];
  84         unsigned long merges[2];
  85         unsigned long ticks[2];
  86         unsigned long io_ticks;
  87         unsigned long time_in_queue;
  88 };
  89
  90 struct hd_struct {
  91         sector_t start_sect;
  92         sector_t nr_sects;
  93         sector_t alignment_offset;
  94         struct device __dev;
  95         struct kobject *holder_dir;
  96         int policy, partno;
  97 #ifdef CONFIG_FAIL_MAKE_REQUEST
  98         int make_it_fail;
  99 #endif
 100         unsigned long stamp;
 101         int in_flight[2];
 102 #ifdef  CONFIG_SMP
 103         struct disk_stats *dkstats;
 104 #else
 105         struct disk_stats dkstats;
 106 #endif
 107         struct rcu_head rcu_head;
 108 };
 109
 110 #define GENHD_FL_REMOVABLE                      1
 111 #define GENHD_FL_DRIVERFS                       2
 112 #define GENHD_FL_MEDIA_CHANGE_NOTIFY            4
 113 #define GENHD_FL_CD                             8
 114 #define GENHD_FL_UP                             16
 115 #define GENHD_FL_SUPPRESS_PARTITION_INFO        32
 116 #define GENHD_FL_EXT_DEVT                       64 /* allow extended devt */
 117 #define GENHD_FL_NATIVE_CAPACITY                128
 118
 119 #define BLK_SCSI_MAX_CMDS       (256)
 120 #define BLK_SCSI_CMD_PER_LONG   (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
 121
 122 struct blk_scsi_cmd_filter {
 123         unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
 124         unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
 125         struct kobject kobj;
 126 };
 127
 128 struct disk_part_tbl {
 129         struct rcu_head rcu_head;
 130         int len;
 131         struct hd_struct *last_lookup;
 132         struct hd_struct *part[];
 133 };
 134
 135 struct gendisk {
 136         /* major, first_minor and minors are input parameters only,
 137          * don't use directly.  Use disk_devt() and disk_max_parts().
 138          */
 139         int major;                      /* major number of driver */
 140         int first_minor;
 141         int minors;                     /* maximum number of minors, =1 for
 142                                          * disks that can't be partitioned. */
 143
 144         char disk_name[DISK_NAME_LEN];  /* name of major driver */
 145         char *(*nodename)(struct gendisk *gd);
 146         /* Array of pointers to partitions indexed by partno.
 147          * Protected with matching bdev lock but stat and other
 148          * non-critical accesses use RCU.  Always access through
 149          * helpers.
 150          */
 151         struct disk_part_tbl *part_tbl;
 152         struct hd_struct part0;
 153
 154         struct block_device_operations *fops;
 155         struct request_queue *queue;
 156         void *private_data;
 157
 158         int flags;
 159         struct device *driverfs_dev;  // FIXME: remove
 160         struct kobject *slave_dir;
 161
 162         struct timer_rand_state *random;
 163
 164         atomic_t sync_io;               /* RAID */
 165         struct work_struct async_notify;
 166 #ifdef  CONFIG_BLK_DEV_INTEGRITY
 167         struct blk_integrity *integrity;
 168 #endif
 169         int node_id;
 170 };
 171
 172 static inline struct gendisk *part_to_disk(struct hd_struct *part)
 173 {
 174         if (likely(part)) {
 175                 if (part->partno)
 176                         return dev_to_disk(part_to_dev(part)->parent);
 177                 else
 178                         return dev_to_disk(part_to_dev(part));
 179         }
 180         return NULL;
 181 }
 182
 183 static inline int disk_max_parts(struct gendisk *disk)
 184 {
 185         if (disk->flags & GENHD_FL_EXT_DEVT)
 186                 return DISK_MAX_PARTS;
 187         return disk->minors;
 188 }
 189
 190 static inline bool disk_partitionable(struct gendisk *disk)
 191 {
 192         return disk_max_parts(disk) > 1;
 193 }
 194
 195 static inline dev_t disk_devt(struct gendisk *disk)
 196 {
 197         return disk_to_dev(disk)->devt;
 198 }
 199
 200 static inline dev_t part_devt(struct hd_struct *part)
 201 {
 202         return part_to_dev(part)->devt;
 203 }
 204
 205 extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
 206
 207 static inline void disk_put_part(struct hd_struct *part)
 208 {
 209         if (likely(part))
 210                 put_device(part_to_dev(part));
 211 }
 212
 213 /*
 214  * Smarter partition iterator without context limits.
 215  */
 216 #define DISK_PITER_REVERSE      (1 << 0) /* iterate in the reverse direction */
 217 #define DISK_PITER_INCL_EMPTY   (1 << 1) /* include 0-sized parts */
 218 #define DISK_PITER_INCL_PART0   (1 << 2) /* include partition 0 */
 219 #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
 220
 221 struct disk_part_iter {
 222         struct gendisk          *disk;
 223         struct hd_struct        *part;
 224         int                     idx;
 225         unsigned int            flags;
 226 };
 227
 228 extern void disk_part_iter_init(struct disk_part_iter *piter,
 229                                  struct gendisk *disk, unsigned int flags);
 230 extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
 231 extern void disk_part_iter_exit(struct disk_part_iter *piter);
 232
 233 extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
 234                                              sector_t sector);
 235
 236 /*
 237  * Macros to operate on percpu disk statistics:
 238  *
 239  * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
 240  * and should be called between disk_stat_lock() and
 241  * disk_stat_unlock().
 242  *
 243  * part_stat_read() can be called at any time.
 244  *
 245  * part_stat_{add|set_all}() and {init|free}_part_stats are for
 246  * internal use only.
 247  */
 248 #ifdef  CONFIG_SMP
 249 #define part_stat_lock()        ({ rcu_read_lock(); get_cpu(); })
 250 #define part_stat_unlock()      do { put_cpu(); rcu_read_unlock(); } while (0)
 251
 252 #define __part_stat_add(cpu, part, field, addnd)                        \
 253         (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
 254
 255 #define part_stat_read(part, field)                                     \
 256 ({                                                                      \
 257         typeof((part)->dkstats->field) res = 0;                         \
 258         int i;                                                          \
 259         for_each_possible_cpu(i)                                        \
 260                 res += per_cpu_ptr((part)->dkstats, i)->field;          \
 261         res;                                                            \
 262 })
 263
 264 static inline void part_stat_set_all(struct hd_struct *part, int value)
 265 {
 266         int i;
 267
 268         for_each_possible_cpu(i)
 269                 memset(per_cpu_ptr(part->dkstats, i), value,
 270                                 sizeof(struct disk_stats));
 271 }
 272
 273 static inline int init_part_stats(struct hd_struct *part)
 274 {
 275         part->dkstats = alloc_percpu(struct disk_stats);
 276         if (!part->dkstats)
 277                 return 0;
 278         return 1;
 279 }
 280
 281 static inline void free_part_stats(struct hd_struct *part)
 282 {
 283         free_percpu(part->dkstats);
 284 }
 285
 286 #else /* !CONFIG_SMP */
 287 #define part_stat_lock()        ({ rcu_read_lock(); 0; })
 288 #define part_stat_unlock()      rcu_read_unlock()
 289
 290 #define __part_stat_add(cpu, part, field, addnd)                                \
 291         ((part)->dkstats.field += addnd)
 292
 293 #define part_stat_read(part, field)     ((part)->dkstats.field)
 294
 295 static inline void part_stat_set_all(struct hd_struct *part, int value)
 296 {
 297         memset(&part->dkstats, value, sizeof(struct disk_stats));
 298 }
 299
 300 static inline int init_part_stats(struct hd_struct *part)
 301 {
 302         return 1;
 303 }
 304
 305 static inline void free_part_stats(struct hd_struct *part)
 306 {
 307 }
 308
 309 #endif /* CONFIG_SMP */
 310
 311 #define part_stat_add(cpu, part, field, addnd)  do {                    \
 312         __part_stat_add((cpu), (part), field, addnd);                   \
 313         if ((part)->partno)                                             \
 314                 __part_stat_add((cpu), &part_to_disk((part))->part0,    \
 315                                 field, addnd);                          \
 316 } while (0)
 317
 318 #define part_stat_dec(cpu, gendiskp, field)                             \
 319         part_stat_add(cpu, gendiskp, field, -1)
 320 #define part_stat_inc(cpu, gendiskp, field)                             \
 321         part_stat_add(cpu, gendiskp, field, 1)
 322 #define part_stat_sub(cpu, gendiskp, field, subnd)                      \
 323         part_stat_add(cpu, gendiskp, field, -subnd)
 324
 325 static inline void part_inc_in_flight(struct hd_struct *part, int rw)
 326 {
 327         part->in_flight[rw]++;
 328         if (part->partno)
 329                 part_to_disk(part)->part0.in_flight[rw]++;
 330 }
 331
 332 static inline void part_dec_in_flight(struct hd_struct *part, int rw)
 333 {
 334         part->in_flight[rw]--;
 335         if (part->partno)
 336                 part_to_disk(part)->part0.in_flight[rw]--;
 337 }
 338
 339 static inline int part_in_flight(struct hd_struct *part)
 340 {
 341         return part->in_flight[0] + part->in_flight[1];
 342 }
 343
 344 /* block/blk-core.c */
 345 extern void part_round_stats(int cpu, struct hd_struct *part);
 346
 347 /* block/genhd.c */
 348 extern void add_disk(struct gendisk *disk);
 349 extern void del_gendisk(struct gendisk *gp);
 350 extern void unlink_gendisk(struct gendisk *gp);
 351 extern struct gendisk *get_gendisk(dev_t dev, int *partno);
 352 extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
 353
 354 extern void set_device_ro(struct block_device *bdev, int flag);
 355 extern void set_disk_ro(struct gendisk *disk, int flag);
 356
 357 static inline int get_disk_ro(struct gendisk *disk)
 358 {
 359         return disk->part0.policy;
 360 }
 361
 362 /* drivers/char/random.c */
 363 extern void add_disk_randomness(struct gendisk *disk);
 364 extern void rand_initialize_disk(struct gendisk *disk);
 365
 366 static inline sector_t get_start_sect(struct block_device *bdev)
 367 {
 368         return bdev->bd_part->start_sect;
 369 }
 370 static inline sector_t get_capacity(struct gendisk *disk)
 371 {
 372         return disk->part0.nr_sects;
 373 }
 374 static inline void set_capacity(struct gendisk *disk, sector_t size)
 375 {
 376         disk->part0.nr_sects = size;
 377 }
 378
 379 #ifdef CONFIG_SOLARIS_X86_PARTITION
 380
 381 #define SOLARIS_X86_NUMSLICE    16
 382 #define SOLARIS_X86_VTOC_SANE   (0x600DDEEEUL)
 383
 384 struct solaris_x86_slice {
 385         __le16 s_tag;           /* ID tag of partition */
 386         __le16 s_flag;          /* permission flags */
 387         __le32 s_start;         /* start sector no of partition */
 388         __le32 s_size;          /* # of blocks in partition */
 389 };
 390
 391 struct solaris_x86_vtoc {
 392         unsigned int v_bootinfo[3];     /* info needed by mboot (unsupported) */
 393         __le32 v_sanity;                /* to verify vtoc sanity */
 394         __le32 v_version;               /* layout version */
 395         char    v_volume[8];            /* volume name */
 396         __le16  v_sectorsz;             /* sector size in bytes */
 397         __le16  v_nparts;               /* number of partitions */
 398         unsigned int v_reserved[10];    /* free space */
 399         struct solaris_x86_slice
 400                 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
 401         unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
 402         char    v_asciilabel[128];      /* for compatibility */
 403 };
 404
 405 #endif /* CONFIG_SOLARIS_X86_PARTITION */
 406
 407 #ifdef CONFIG_BSD_DISKLABEL
 408 /*
 409  * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
 410  * updated by Marc Espie <Marc.Espie@openbsd.org>
 411  */
 412
 413 /* check against BSD src/sys/sys/disklabel.h for consistency */
 414
 415 #define BSD_DISKMAGIC   (0x82564557UL)  /* The disk magic number */
 416 #define BSD_MAXPARTITIONS       16
 417 #define OPENBSD_MAXPARTITIONS   16
 418 #define BSD_FS_UNUSED           0       /* disklabel unused partition entry ID */
 419 struct bsd_disklabel {
 420         __le32  d_magic;                /* the magic number */
 421         __s16   d_type;                 /* drive type */
 422         __s16   d_subtype;              /* controller/d_type specific */
 423         char    d_typename[16];         /* type name, e.g. "eagle" */
 424         char    d_packname[16];                 /* pack identifier */
 425         __u32   d_secsize;              /* # of bytes per sector */
 426         __u32   d_nsectors;             /* # of data sectors per track */
 427         __u32   d_ntracks;              /* # of tracks per cylinder */
 428         __u32   d_ncylinders;           /* # of data cylinders per unit */
 429         __u32   d_secpercyl;            /* # of data sectors per cylinder */
 430         __u32   d_secperunit;           /* # of data sectors per unit */
 431         __u16   d_sparespertrack;       /* # of spare sectors per track */
 432         __u16   d_sparespercyl;         /* # of spare sectors per cylinder */
 433         __u32   d_acylinders;           /* # of alt. cylinders per unit */
 434         __u16   d_rpm;                  /* rotational speed */
 435         __u16   d_interleave;           /* hardware sector interleave */
 436         __u16   d_trackskew;            /* sector 0 skew, per track */
 437         __u16   d_cylskew;              /* sector 0 skew, per cylinder */
 438         __u32   d_headswitch;           /* head switch time, usec */
 439         __u32   d_trkseek;              /* track-to-track seek, usec */
 440         __u32   d_flags;                /* generic flags */
 441 #define NDDATA 5
 442         __u32   d_drivedata[NDDATA];    /* drive-type specific information */
 443 #define NSPARE 5
 444         __u32   d_spare[NSPARE];        /* reserved for future use */
 445         __le32  d_magic2;               /* the magic number (again) */
 446         __le16  d_checksum;             /* xor of data incl. partitions */
 447
 448                         /* filesystem and partition information: */
 449         __le16  d_npartitions;          /* number of partitions in following */
 450         __le32  d_bbsize;               /* size of boot area at sn0, bytes */
 451         __le32  d_sbsize;               /* max size of fs superblock, bytes */
 452         struct  bsd_partition {         /* the partition table */
 453                 __le32  p_size;         /* number of sectors in partition */
 454                 __le32  p_offset;       /* starting sector */
 455                 __le32  p_fsize;        /* filesystem basic fragment size */
 456                 __u8    p_fstype;       /* filesystem type, see below */
 457                 __u8    p_frag;         /* filesystem fragments per block */
 458                 __le16  p_cpg;          /* filesystem cylinders per group */
 459         } d_partitions[BSD_MAXPARTITIONS];      /* actually may be more */
 460 };
 461
 462 #endif  /* CONFIG_BSD_DISKLABEL */
 463
 464 #ifdef CONFIG_UNIXWARE_DISKLABEL
 465 /*
 466  * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
 467  * and Krzysztof G. Baranowski <kgb@knm.org.pl>
 468  */
 469
 470 #define UNIXWARE_DISKMAGIC     (0xCA5E600DUL)   /* The disk magic number */
 471 #define UNIXWARE_DISKMAGIC2    (0x600DDEEEUL)   /* The slice table magic nr */
 472 #define UNIXWARE_NUMSLICE      16
 473 #define UNIXWARE_FS_UNUSED     0                /* Unused slice entry ID */
 474
 475 struct unixware_slice {
 476         __le16   s_label;       /* label */
 477         __le16   s_flags;       /* permission flags */
 478         __le32   start_sect;    /* starting sector */
 479         __le32   nr_sects;      /* number of sectors in slice */
 480 };
 481
 482 struct unixware_disklabel {
 483         __le32   d_type;                /* drive type */
 484         __le32   d_magic;                /* the magic number */
 485         __le32   d_version;              /* version number */
 486         char    d_serial[12];           /* serial number of the device */
 487         __le32   d_ncylinders;           /* # of data cylinders per device */
 488         __le32   d_ntracks;              /* # of tracks per cylinder */
 489         __le32   d_nsectors;             /* # of data sectors per track */
 490         __le32   d_secsize;              /* # of bytes per sector */
 491         __le32   d_part_start;           /* # of first sector of this partition */
 492         __le32   d_unknown1[12];         /* ? */
 493         __le32  d_alt_tbl;              /* byte offset of alternate table */
 494         __le32  d_alt_len;              /* byte length of alternate table */
 495         __le32  d_phys_cyl;             /* # of physical cylinders per device */
 496         __le32  d_phys_trk;             /* # of physical tracks per cylinder */
 497         __le32  d_phys_sec;             /* # of physical sectors per track */
 498         __le32  d_phys_bytes;           /* # of physical bytes per sector */
 499         __le32  d_unknown2;             /* ? */
 500         __le32   d_unknown3;             /* ? */
 501         __le32  d_pad[8];               /* pad */
 502
 503         struct unixware_vtoc {
 504                 __le32  v_magic;                /* the magic number */
 505                 __le32  v_version;              /* version number */
 506                 char    v_name[8];              /* volume name */
 507                 __le16  v_nslices;              /* # of slices */
 508                 __le16  v_unknown1;             /* ? */
 509                 __le32  v_reserved[10];         /* reserved */
 510                 struct unixware_slice
 511                         v_slice[UNIXWARE_NUMSLICE];     /* slice headers */
 512         } vtoc;
 513
 514 };  /* 408 */
 515
 516 #endif /* CONFIG_UNIXWARE_DISKLABEL */
 517
 518 #ifdef CONFIG_MINIX_SUBPARTITION
 519 #   define MINIX_NR_SUBPARTITIONS  4
 520 #endif /* CONFIG_MINIX_SUBPARTITION */
 521
 522 #define ADDPART_FLAG_NONE       0
 523 #define ADDPART_FLAG_RAID       1
 524 #define ADDPART_FLAG_WHOLEDISK  2
 525
 526 extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
 527 extern void blk_free_devt(dev_t devt);
 528 extern dev_t blk_lookup_devt(const char *name, int partno);
 529 extern char *disk_name (struct gendisk *hd, int partno, char *buf);
 530
 531 extern int disk_expand_part_tbl(struct gendisk *disk, int target);
 532 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
 533 extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
 534                                                      int partno, sector_t start,
 535                                                      sector_t len, int flags);
 536 extern void delete_partition(struct gendisk *, int);
 537 extern void printk_all_partitions(void);
 538
 539 extern struct gendisk *alloc_disk_node(int minors, int node_id);
 540 extern struct gendisk *alloc_disk(int minors);
 541 extern struct kobject *get_disk(struct gendisk *disk);
 542 extern void put_disk(struct gendisk *disk);
 543 extern void blk_register_region(dev_t devt, unsigned long range,
 544                         struct module *module,
 545                         struct kobject *(*probe)(dev_t, int *, void *),
 546                         int (*lock)(dev_t, void *),
 547                         void *data);
 548 extern void blk_unregister_region(dev_t devt, unsigned long range);
 549
 550 extern ssize_t part_size_show(struct device *dev,
 551                               struct device_attribute *attr, char *buf);
 552 extern ssize_t part_stat_show(struct device *dev,
 553                               struct device_attribute *attr, char *buf);
 554 extern ssize_t part_inflight_show(struct device *dev,
 555                               struct device_attribute *attr, char *buf);
 556 #ifdef CONFIG_FAIL_MAKE_REQUEST
 557 extern ssize_t part_fail_show(struct device *dev,
 558                               struct device_attribute *attr, char *buf);
 559 extern ssize_t part_fail_store(struct device *dev,
 560                                struct device_attribute *attr,
 561                                const char *buf, size_t count);
 562 #endif /* CONFIG_FAIL_MAKE_REQUEST */
 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 partno)
 569 {
 570         dev_t devt = MKDEV(0, 0);
 571         return devt;
 572 }
 573
 574 #endif /* CONFIG_BLOCK */
 575
 576 #endif /* _LINUX_GENHD_H */