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         unsigned int discard_alignment;
  95         struct device __dev;
  96         struct kobject *holder_dir;
  97         int policy, partno;
  98 #ifdef CONFIG_FAIL_MAKE_REQUEST
  99         int make_it_fail;
 100 #endif
 101         unsigned long stamp;
 102         int in_flight[2];
 103 #ifdef  CONFIG_SMP
 104         struct disk_stats __percpu *dkstats;
 105 #else
 106         struct disk_stats dkstats;
 107 #endif
 108         struct rcu_head rcu_head;
 109 };
 110
 111 #define GENHD_FL_REMOVABLE                      1
 112 /* 2 is unused */
 113 #define GENHD_FL_MEDIA_CHANGE_NOTIFY            4
 114 #define GENHD_FL_CD                             8
 115 #define GENHD_FL_UP                             16
 116 #define GENHD_FL_SUPPRESS_PARTITION_INFO        32
 117 #define GENHD_FL_EXT_DEVT                       64 /* allow extended devt */
 118 #define GENHD_FL_NATIVE_CAPACITY                128
 119
 120 #define BLK_SCSI_MAX_CMDS       (256)
 121 #define BLK_SCSI_CMD_PER_LONG   (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
 122
 123 struct blk_scsi_cmd_filter {
 124         unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
 125         unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
 126         struct kobject kobj;
 127 };
 128
 129 struct disk_part_tbl {
 130         struct rcu_head rcu_head;
 131         int len;
 132         struct hd_struct *last_lookup;
 133         struct hd_struct *part[];
 134 };
 135
 136 struct gendisk {
 137         /* major, first_minor and minors are input parameters only,
 138          * don't use directly.  Use disk_devt() and disk_max_parts().
 139          */
 140         int major;                      /* major number of driver */
 141         int first_minor;
 142         int minors;                     /* maximum number of minors, =1 for
 143                                          * disks that can't be partitioned. */
 144
 145         char disk_name[DISK_NAME_LEN];  /* name of major driver */
 146         char *(*devnode)(struct gendisk *gd, mode_t *mode);
 147         /* Array of pointers to partitions indexed by partno.
 148          * Protected with matching bdev lock but stat and other
 149          * non-critical accesses use RCU.  Always access through
 150          * helpers.
 151          */
 152         struct disk_part_tbl *part_tbl;
 153         struct hd_struct part0;
 154
 155         const struct block_device_operations *fops;
 156         struct request_queue *queue;
 157         void *private_data;
 158
 159         int flags;
 160         struct device *driverfs_dev;  // FIXME: remove
 161         struct kobject *slave_dir;
 162
 163         struct timer_rand_state *random;
 164
 165         atomic_t sync_io;               /* RAID */
 166         struct work_struct async_notify;
 167 #ifdef  CONFIG_BLK_DEV_INTEGRITY
 168         struct blk_integrity *integrity;
 169 #endif
 170         int node_id;
 171 };
 172
 173 static inline struct gendisk *part_to_disk(struct hd_struct *part)
 174 {
 175         if (likely(part)) {
 176                 if (part->partno)
 177                         return dev_to_disk(part_to_dev(part)->parent);
 178                 else
 179                         return dev_to_disk(part_to_dev(part));
 180         }
 181         return NULL;
 182 }
 183
 184 static inline int disk_max_parts(struct gendisk *disk)
 185 {
 186         if (disk->flags & GENHD_FL_EXT_DEVT)
 187                 return DISK_MAX_PARTS;
 188         return disk->minors;
 189 }
 190
 191 static inline bool disk_partitionable(struct gendisk *disk)
 192 {
 193         return disk_max_parts(disk) > 1;
 194 }
 195
 196 static inline dev_t disk_devt(struct gendisk *disk)
 197 {
 198         return disk_to_dev(disk)->devt;
 199 }
 200
 201 static inline dev_t part_devt(struct hd_struct *part)
 202 {
 203         return part_to_dev(part)->devt;
 204 }
 205
 206 extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
 207
 208 static inline void disk_put_part(struct hd_struct *part)
 209 {
 210         if (likely(part))
 211                 put_device(part_to_dev(part));
 212 }
 213
 214 /*
 215  * Smarter partition iterator without context limits.
 216  */
 217 #define DISK_PITER_REVERSE      (1 << 0) /* iterate in the reverse direction */
 218 #define DISK_PITER_INCL_EMPTY   (1 << 1) /* include 0-sized parts */
 219 #define DISK_PITER_INCL_PART0   (1 << 2) /* include partition 0 */
 220 #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
 221
 222 struct disk_part_iter {
 223         struct gendisk          *disk;
 224         struct hd_struct        *part;
 225         int                     idx;
 226         unsigned int            flags;
 227 };
 228
 229 extern void disk_part_iter_init(struct disk_part_iter *piter,
 230                                  struct gendisk *disk, unsigned int flags);
 231 extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
 232 extern void disk_part_iter_exit(struct disk_part_iter *piter);
 233
 234 extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
 235                                              sector_t sector);
 236
 237 /*
 238  * Macros to operate on percpu disk statistics:
 239  *
 240  * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
 241  * and should be called between disk_stat_lock() and
 242  * disk_stat_unlock().
 243  *
 244  * part_stat_read() can be called at any time.
 245  *
 246  * part_stat_{add|set_all}() and {init|free}_part_stats are for
 247  * internal use only.
 248  */
 249 #ifdef  CONFIG_SMP
 250 #define part_stat_lock()        ({ rcu_read_lock(); get_cpu(); })
 251 #define part_stat_unlock()      do { put_cpu(); rcu_read_unlock(); } while (0)
 252
 253 #define __part_stat_add(cpu, part, field, addnd)                        \
 254         (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
 255
 256 #define part_stat_read(part, field)                                     \
 257 ({                                                                      \
 258         typeof((part)->dkstats->field) res = 0;                         \
 259         unsigned int _cpu;                                              \
 260         for_each_possible_cpu(_cpu)                                     \
 261                 res += per_cpu_ptr((part)->dkstats, _cpu)->field;       \
 262         res;                                                            \
 263 })
 264
 265 static inline void part_stat_set_all(struct hd_struct *part, int value)
 266 {
 267         int i;
 268
 269         for_each_possible_cpu(i)
 270                 memset(per_cpu_ptr(part->dkstats, i), value,
 271                                 sizeof(struct disk_stats));
 272 }
 273
 274 static inline int init_part_stats(struct hd_struct *part)
 275 {
 276         part->dkstats = alloc_percpu(struct disk_stats);
 277         if (!part->dkstats)
 278                 return 0;
 279         return 1;
 280 }
 281
 282 static inline void free_part_stats(struct hd_struct *part)
 283 {
 284         free_percpu(part->dkstats);
 285 }
 286
 287 #else /* !CONFIG_SMP */
 288 #define part_stat_lock()        ({ rcu_read_lock(); 0; })
 289 #define part_stat_unlock()      rcu_read_unlock()
 290
 291 #define __part_stat_add(cpu, part, field, addnd)                                \
 292         ((part)->dkstats.field += addnd)
 293
 294 #define part_stat_read(part, field)     ((part)->dkstats.field)
 295
 296 static inline void part_stat_set_all(struct hd_struct *part, int value)
 297 {
 298         memset(&part->dkstats, value, sizeof(struct disk_stats));
 299 }
 300
 301 static inline int init_part_stats(struct hd_struct *part)
 302 {
 303         return 1;
 304 }
 305
 306 static inline void free_part_stats(struct hd_struct *part)
 307 {
 308 }
 309
 310 #endif /* CONFIG_SMP */
 311
 312 #define part_stat_add(cpu, part, field, addnd)  do {                    \
 313         __part_stat_add((cpu), (part), field, addnd);                   \
 314         if ((part)->partno)                                             \
 315                 __part_stat_add((cpu), &part_to_disk((part))->part0,    \
 316                                 field, addnd);                          \
 317 } while (0)
 318
 319 #define part_stat_dec(cpu, gendiskp, field)                             \
 320         part_stat_add(cpu, gendiskp, field, -1)
 321 #define part_stat_inc(cpu, gendiskp, field)                             \
 322         part_stat_add(cpu, gendiskp, field, 1)
 323 #define part_stat_sub(cpu, gendiskp, field, subnd)                      \
 324         part_stat_add(cpu, gendiskp, field, -subnd)
 325
 326 static inline void part_inc_in_flight(struct hd_struct *part, int rw)
 327 {
 328         part->in_flight[rw]++;
 329         if (part->partno)
 330                 part_to_disk(part)->part0.in_flight[rw]++;
 331 }
 332
 333 static inline void part_dec_in_flight(struct hd_struct *part, int rw)
 334 {
 335         part->in_flight[rw]--;
 336         if (part->partno)
 337                 part_to_disk(part)->part0.in_flight[rw]--;
 338 }
 339
 340 static inline int part_in_flight(struct hd_struct *part)
 341 {
 342         return part->in_flight[0] + part->in_flight[1];
 343 }
 344
 345 /* block/blk-core.c */
 346 extern void part_round_stats(int cpu, struct hd_struct *part);
 347
 348 /* block/genhd.c */
 349 extern void add_disk(struct gendisk *disk);
 350 extern void del_gendisk(struct gendisk *gp);
 351 extern void unlink_gendisk(struct gendisk *gp);
 352 extern struct gendisk *get_gendisk(dev_t dev, int *partno);
 353 extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
 354
 355 extern void set_device_ro(struct block_device *bdev, int flag);
 356 extern void set_disk_ro(struct gendisk *disk, int flag);
 357
 358 static inline int get_disk_ro(struct gendisk *disk)
 359 {
 360         return disk->part0.policy;
 361 }
 362
 363 /* drivers/char/random.c */
 364 extern void add_disk_randomness(struct gendisk *disk);
 365 extern void rand_initialize_disk(struct gendisk *disk);
 366
 367 static inline sector_t get_start_sect(struct block_device *bdev)
 368 {
 369         return bdev->bd_part->start_sect;
 370 }
 371 static inline sector_t get_capacity(struct gendisk *disk)
 372 {
 373         return disk->part0.nr_sects;
 374 }
 375 static inline void set_capacity(struct gendisk *disk, sector_t size)
 376 {
 377         disk->part0.nr_sects = size;
 378 }
 379
 380 #ifdef CONFIG_SOLARIS_X86_PARTITION
 381
 382 #define SOLARIS_X86_NUMSLICE    16
 383 #define SOLARIS_X86_VTOC_SANE   (0x600DDEEEUL)
 384
 385 struct solaris_x86_slice {
 386         __le16 s_tag;           /* ID tag of partition */
 387         __le16 s_flag;          /* permission flags */
 388         __le32 s_start;         /* start sector no of partition */
 389         __le32 s_size;          /* # of blocks in partition */
 390 };
 391
 392 struct solaris_x86_vtoc {
 393         unsigned int v_bootinfo[3];     /* info needed by mboot (unsupported) */
 394         __le32 v_sanity;                /* to verify vtoc sanity */
 395         __le32 v_version;               /* layout version */
 396         char    v_volume[8];            /* volume name */
 397         __le16  v_sectorsz;             /* sector size in bytes */
 398         __le16  v_nparts;               /* number of partitions */
 399         unsigned int v_reserved[10];    /* free space */
 400         struct solaris_x86_slice
 401                 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
 402         unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
 403         char    v_asciilabel[128];      /* for compatibility */
 404 };
 405
 406 #endif /* CONFIG_SOLARIS_X86_PARTITION */
 407
 408 #ifdef CONFIG_BSD_DISKLABEL
 409 /*
 410  * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
 411  * updated by Marc Espie <Marc.Espie@openbsd.org>
 412  */
 413
 414 /* check against BSD src/sys/sys/disklabel.h for consistency */
 415
 416 #define BSD_DISKMAGIC   (0x82564557UL)  /* The disk magic number */
 417 #define BSD_MAXPARTITIONS       16
 418 #define OPENBSD_MAXPARTITIONS   16
 419 #define BSD_FS_UNUSED           0       /* disklabel unused partition entry ID */
 420 struct bsd_disklabel {
 421         __le32  d_magic;                /* the magic number */
 422         __s16   d_type;                 /* drive type */
 423         __s16   d_subtype;              /* controller/d_type specific */
 424         char    d_typename[16];         /* type name, e.g. "eagle" */
 425         char    d_packname[16];                 /* pack identifier */
 426         __u32   d_secsize;              /* # of bytes per sector */
 427         __u32   d_nsectors;             /* # of data sectors per track */
 428         __u32   d_ntracks;              /* # of tracks per cylinder */
 429         __u32   d_ncylinders;           /* # of data cylinders per unit */
 430         __u32   d_secpercyl;            /* # of data sectors per cylinder */
 431         __u32   d_secperunit;           /* # of data sectors per unit */
 432         __u16   d_sparespertrack;       /* # of spare sectors per track */
 433         __u16   d_sparespercyl;         /* # of spare sectors per cylinder */
 434         __u32   d_acylinders;           /* # of alt. cylinders per unit */
 435         __u16   d_rpm;                  /* rotational speed */
 436         __u16   d_interleave;           /* hardware sector interleave */
 437         __u16   d_trackskew;            /* sector 0 skew, per track */
 438         __u16   d_cylskew;              /* sector 0 skew, per cylinder */
 439         __u32   d_headswitch;           /* head switch time, usec */
 440         __u32   d_trkseek;              /* track-to-track seek, usec */
 441         __u32   d_flags;                /* generic flags */
 442 #define NDDATA 5
 443         __u32   d_drivedata[NDDATA];    /* drive-type specific information */
 444 #define NSPARE 5
 445         __u32   d_spare[NSPARE];        /* reserved for future use */
 446         __le32  d_magic2;               /* the magic number (again) */
 447         __le16  d_checksum;             /* xor of data incl. partitions */
 448
 449                         /* filesystem and partition information: */
 450         __le16  d_npartitions;          /* number of partitions in following */
 451         __le32  d_bbsize;               /* size of boot area at sn0, bytes */
 452         __le32  d_sbsize;               /* max size of fs superblock, bytes */
 453         struct  bsd_partition {         /* the partition table */
 454                 __le32  p_size;         /* number of sectors in partition */
 455                 __le32  p_offset;       /* starting sector */
 456                 __le32  p_fsize;        /* filesystem basic fragment size */
 457                 __u8    p_fstype;       /* filesystem type, see below */
 458                 __u8    p_frag;         /* filesystem fragments per block */
 459                 __le16  p_cpg;          /* filesystem cylinders per group */
 460         } d_partitions[BSD_MAXPARTITIONS];      /* actually may be more */
 461 };
 462
 463 #endif  /* CONFIG_BSD_DISKLABEL */
 464
 465 #ifdef CONFIG_UNIXWARE_DISKLABEL
 466 /*
 467  * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
 468  * and Krzysztof G. Baranowski <kgb@knm.org.pl>
 469  */
 470
 471 #define UNIXWARE_DISKMAGIC     (0xCA5E600DUL)   /* The disk magic number */
 472 #define UNIXWARE_DISKMAGIC2    (0x600DDEEEUL)   /* The slice table magic nr */
 473 #define UNIXWARE_NUMSLICE      16
 474 #define UNIXWARE_FS_UNUSED     0                /* Unused slice entry ID */
 475
 476 struct unixware_slice {
 477         __le16   s_label;       /* label */
 478         __le16   s_flags;       /* permission flags */
 479         __le32   start_sect;    /* starting sector */
 480         __le32   nr_sects;      /* number of sectors in slice */
 481 };
 482
 483 struct unixware_disklabel {
 484         __le32   d_type;                /* drive type */
 485         __le32   d_magic;                /* the magic number */
 486         __le32   d_version;              /* version number */
 487         char    d_serial[12];           /* serial number of the device */
 488         __le32   d_ncylinders;           /* # of data cylinders per device */
 489         __le32   d_ntracks;              /* # of tracks per cylinder */
 490         __le32   d_nsectors;             /* # of data sectors per track */
 491         __le32   d_secsize;              /* # of bytes per sector */
 492         __le32   d_part_start;           /* # of first sector of this partition */
 493         __le32   d_unknown1[12];         /* ? */
 494         __le32  d_alt_tbl;              /* byte offset of alternate table */
 495         __le32  d_alt_len;              /* byte length of alternate table */
 496         __le32  d_phys_cyl;             /* # of physical cylinders per device */
 497         __le32  d_phys_trk;             /* # of physical tracks per cylinder */
 498         __le32  d_phys_sec;             /* # of physical sectors per track */
 499         __le32  d_phys_bytes;           /* # of physical bytes per sector */
 500         __le32  d_unknown2;             /* ? */
 501         __le32   d_unknown3;             /* ? */
 502         __le32  d_pad[8];               /* pad */
 503
 504         struct unixware_vtoc {
 505                 __le32  v_magic;                /* the magic number */
 506                 __le32  v_version;              /* version number */
 507                 char    v_name[8];              /* volume name */
 508                 __le16  v_nslices;              /* # of slices */
 509                 __le16  v_unknown1;             /* ? */
 510                 __le32  v_reserved[10];         /* reserved */
 511                 struct unixware_slice
 512                         v_slice[UNIXWARE_NUMSLICE];     /* slice headers */
 513         } vtoc;
 514
 515 };  /* 408 */
 516
 517 #endif /* CONFIG_UNIXWARE_DISKLABEL */
 518
 519 #ifdef CONFIG_MINIX_SUBPARTITION
 520 #   define MINIX_NR_SUBPARTITIONS  4
 521 #endif /* CONFIG_MINIX_SUBPARTITION */
 522
 523 #define ADDPART_FLAG_NONE       0
 524 #define ADDPART_FLAG_RAID       1
 525 #define ADDPART_FLAG_WHOLEDISK  2
 526
 527 extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
 528 extern void blk_free_devt(dev_t devt);
 529 extern dev_t blk_lookup_devt(const char *name, int partno);
 530 extern char *disk_name (struct gendisk *hd, int partno, char *buf);
 531
 532 extern int disk_expand_part_tbl(struct gendisk *disk, int target);
 533 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
 534 extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
 535                                                      int partno, sector_t start,
 536                                                      sector_t len, int flags);
 537 extern void delete_partition(struct gendisk *, int);
 538 extern void printk_all_partitions(void);
 539
 540 extern struct gendisk *alloc_disk_node(int minors, int node_id);
 541 extern struct gendisk *alloc_disk(int minors);
 542 extern struct kobject *get_disk(struct gendisk *disk);
 543 extern void put_disk(struct gendisk *disk);
 544 extern void blk_register_region(dev_t devt, unsigned long range,
 545                         struct module *module,
 546                         struct kobject *(*probe)(dev_t, int *, void *),
 547                         int (*lock)(dev_t, void *),
 548                         void *data);
 549 extern void blk_unregister_region(dev_t devt, unsigned long range);
 550
 551 extern ssize_t part_size_show(struct device *dev,
 552                               struct device_attribute *attr, char *buf);
 553 extern ssize_t part_stat_show(struct device *dev,
 554                               struct device_attribute *attr, char *buf);
 555 extern ssize_t part_inflight_show(struct device *dev,
 556                               struct device_attribute *attr, char *buf);
 557 #ifdef CONFIG_FAIL_MAKE_REQUEST
 558 extern ssize_t part_fail_show(struct device *dev,
 559                               struct device_attribute *attr, char *buf);
 560 extern ssize_t part_fail_store(struct device *dev,
 561                                struct device_attribute *attr,
 562                                const char *buf, size_t count);
 563 #endif /* CONFIG_FAIL_MAKE_REQUEST */
 564
 565 #else /* CONFIG_BLOCK */
 566
 567 static inline void printk_all_partitions(void) { }
 568
 569 static inline dev_t blk_lookup_devt(const char *name, int partno)
 570 {
 571         dev_t devt = MKDEV(0, 0);
 572         return devt;
 573 }
 574
 575 #endif /* CONFIG_BLOCK */
 576
 577 #endif /* _LINUX_GENHD_H */