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 #include <linux/slab.h>
  16
  17 #ifdef CONFIG_BLOCK
  18
  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 #define PARTITION_META_INFO_VOLNAMELTH  64
  91 #define PARTITION_META_INFO_UUIDLTH     16
  92
  93 struct partition_meta_info {
  94         u8 uuid[PARTITION_META_INFO_UUIDLTH];   /* always big endian */
  95         u8 volname[PARTITION_META_INFO_VOLNAMELTH];
  96 };
  97
  98 struct hd_struct {
  99         sector_t start_sect;
 100         sector_t nr_sects;
 101         sector_t alignment_offset;
 102         unsigned int discard_alignment;
 103         struct device __dev;
 104         struct kobject *holder_dir;
 105         int policy, partno;
 106         struct partition_meta_info *info;
 107 #ifdef CONFIG_FAIL_MAKE_REQUEST
 108         int make_it_fail;
 109 #endif
 110         unsigned long stamp;
 111         atomic_t in_flight[2];
 112 #ifdef  CONFIG_SMP
 113         struct disk_stats __percpu *dkstats;
 114 #else
 115         struct disk_stats dkstats;
 116 #endif
 117         atomic_t ref;
 118         struct rcu_head rcu_head;
 119 };
 120
 121 #define GENHD_FL_REMOVABLE                      1
 122 /* 2 is unused */
 123 #define GENHD_FL_MEDIA_CHANGE_NOTIFY            4
 124 #define GENHD_FL_CD                             8
 125 #define GENHD_FL_UP                             16
 126 #define GENHD_FL_SUPPRESS_PARTITION_INFO        32
 127 #define GENHD_FL_EXT_DEVT                       64 /* allow extended devt */
 128 #define GENHD_FL_NATIVE_CAPACITY                128
 129 #define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE     256
 130 #define GENHD_FL_NO_PART_SCAN                   512
 131
 132 enum {
 133         DISK_EVENT_MEDIA_CHANGE                 = 1 << 0, /* media changed */
 134         DISK_EVENT_EJECT_REQUEST                = 1 << 1, /* eject requested */
 135 };
 136
 137 #define BLK_SCSI_MAX_CMDS       (256)
 138 #define BLK_SCSI_CMD_PER_LONG   (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
 139
 140 struct blk_scsi_cmd_filter {
 141         unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
 142         unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
 143         struct kobject kobj;
 144 };
 145
 146 struct disk_part_tbl {
 147         struct rcu_head rcu_head;
 148         int len;
 149         struct hd_struct __rcu *last_lookup;
 150         struct hd_struct __rcu *part[];
 151 };
 152
 153 struct disk_events;
 154
 155 struct gendisk {
 156         /* major, first_minor and minors are input parameters only,
 157          * don't use directly.  Use disk_devt() and disk_max_parts().
 158          */
 159         int major;                      /* major number of driver */
 160         int first_minor;
 161         int minors;                     /* maximum number of minors, =1 for
 162                                          * disks that can't be partitioned. */
 163
 164         char disk_name[DISK_NAME_LEN];  /* name of major driver */
 165         char *(*devnode)(struct gendisk *gd, umode_t *mode);
 166
 167         unsigned int events;            /* supported events */
 168         unsigned int async_events;      /* async events, subset of all */
 169
 170         /* Array of pointers to partitions indexed by partno.
 171          * Protected with matching bdev lock but stat and other
 172          * non-critical accesses use RCU.  Always access through
 173          * helpers.
 174          */
 175         struct disk_part_tbl __rcu *part_tbl;
 176         struct hd_struct part0;
 177
 178         const struct block_device_operations *fops;
 179         struct request_queue *queue;
 180         void *private_data;
 181
 182         int flags;
 183         struct device *driverfs_dev;  // FIXME: remove
 184         struct kobject *slave_dir;
 185
 186         struct timer_rand_state *random;
 187         atomic_t sync_io;               /* RAID */
 188         struct disk_events *ev;
 189 #ifdef  CONFIG_BLK_DEV_INTEGRITY
 190         struct blk_integrity *integrity;
 191 #endif
 192         int node_id;
 193 };
 194
 195 static inline struct gendisk *part_to_disk(struct hd_struct *part)
 196 {
 197         if (likely(part)) {
 198                 if (part->partno)
 199                         return dev_to_disk(part_to_dev(part)->parent);
 200                 else
 201                         return dev_to_disk(part_to_dev(part));
 202         }
 203         return NULL;
 204 }
 205
 206 static inline void part_pack_uuid(const u8 *uuid_str, u8 *to)
 207 {
 208         int i;
 209         for (i = 0; i < 16; ++i) {
 210                 *to++ = (hex_to_bin(*uuid_str) << 4) |
 211                         (hex_to_bin(*(uuid_str + 1)));
 212                 uuid_str += 2;
 213                 switch (i) {
 214                 case 3:
 215                 case 5:
 216                 case 7:
 217                 case 9:
 218                         uuid_str++;
 219                         continue;
 220                 }
 221         }
 222 }
 223
 224 static inline int disk_max_parts(struct gendisk *disk)
 225 {
 226         if (disk->flags & GENHD_FL_EXT_DEVT)
 227                 return DISK_MAX_PARTS;
 228         return disk->minors;
 229 }
 230
 231 static inline bool disk_part_scan_enabled(struct gendisk *disk)
 232 {
 233         return disk_max_parts(disk) > 1 &&
 234                 !(disk->flags & GENHD_FL_NO_PART_SCAN);
 235 }
 236
 237 static inline dev_t disk_devt(struct gendisk *disk)
 238 {
 239         return disk_to_dev(disk)->devt;
 240 }
 241
 242 static inline dev_t part_devt(struct hd_struct *part)
 243 {
 244         return part_to_dev(part)->devt;
 245 }
 246
 247 extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
 248
 249 static inline void disk_put_part(struct hd_struct *part)
 250 {
 251         if (likely(part))
 252                 put_device(part_to_dev(part));
 253 }
 254
 255 /*
 256  * Smarter partition iterator without context limits.
 257  */
 258 #define DISK_PITER_REVERSE      (1 << 0) /* iterate in the reverse direction */
 259 #define DISK_PITER_INCL_EMPTY   (1 << 1) /* include 0-sized parts */
 260 #define DISK_PITER_INCL_PART0   (1 << 2) /* include partition 0 */
 261 #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
 262
 263 struct disk_part_iter {
 264         struct gendisk          *disk;
 265         struct hd_struct        *part;
 266         int                     idx;
 267         unsigned int            flags;
 268 };
 269
 270 extern void disk_part_iter_init(struct disk_part_iter *piter,
 271                                  struct gendisk *disk, unsigned int flags);
 272 extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
 273 extern void disk_part_iter_exit(struct disk_part_iter *piter);
 274
 275 extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
 276                                              sector_t sector);
 277
 278 /*
 279  * Macros to operate on percpu disk statistics:
 280  *
 281  * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
 282  * and should be called between disk_stat_lock() and
 283  * disk_stat_unlock().
 284  *
 285  * part_stat_read() can be called at any time.
 286  *
 287  * part_stat_{add|set_all}() and {init|free}_part_stats are for
 288  * internal use only.
 289  */
 290 #ifdef  CONFIG_SMP
 291 #define part_stat_lock()        ({ rcu_read_lock(); get_cpu(); })
 292 #define part_stat_unlock()      do { put_cpu(); rcu_read_unlock(); } while (0)
 293
 294 #define __part_stat_add(cpu, part, field, addnd)                        \
 295         (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
 296
 297 #define part_stat_read(part, field)                                     \
 298 ({                                                                      \
 299         typeof((part)->dkstats->field) res = 0;                         \
 300         unsigned int _cpu;                                              \
 301         for_each_possible_cpu(_cpu)                                     \
 302                 res += per_cpu_ptr((part)->dkstats, _cpu)->field;       \
 303         res;                                                            \
 304 })
 305
 306 static inline void part_stat_set_all(struct hd_struct *part, int value)
 307 {
 308         int i;
 309
 310         for_each_possible_cpu(i)
 311                 memset(per_cpu_ptr(part->dkstats, i), value,
 312                                 sizeof(struct disk_stats));
 313 }
 314
 315 static inline int init_part_stats(struct hd_struct *part)
 316 {
 317         part->dkstats = alloc_percpu(struct disk_stats);
 318         if (!part->dkstats)
 319                 return 0;
 320         return 1;
 321 }
 322
 323 static inline void free_part_stats(struct hd_struct *part)
 324 {
 325         free_percpu(part->dkstats);
 326 }
 327
 328 #else /* !CONFIG_SMP */
 329 #define part_stat_lock()        ({ rcu_read_lock(); 0; })
 330 #define part_stat_unlock()      rcu_read_unlock()
 331
 332 #define __part_stat_add(cpu, part, field, addnd)                                \
 333         ((part)->dkstats.field += addnd)
 334
 335 #define part_stat_read(part, field)     ((part)->dkstats.field)
 336
 337 static inline void part_stat_set_all(struct hd_struct *part, int value)
 338 {
 339         memset(&part->dkstats, value, sizeof(struct disk_stats));
 340 }
 341
 342 static inline int init_part_stats(struct hd_struct *part)
 343 {
 344         return 1;
 345 }
 346
 347 static inline void free_part_stats(struct hd_struct *part)
 348 {
 349 }
 350
 351 #endif /* CONFIG_SMP */
 352
 353 #define part_stat_add(cpu, part, field, addnd)  do {                    \
 354         __part_stat_add((cpu), (part), field, addnd);                   \
 355         if ((part)->partno)                                             \
 356                 __part_stat_add((cpu), &part_to_disk((part))->part0,    \
 357                                 field, addnd);                          \
 358 } while (0)
 359
 360 #define part_stat_dec(cpu, gendiskp, field)                             \
 361         part_stat_add(cpu, gendiskp, field, -1)
 362 #define part_stat_inc(cpu, gendiskp, field)                             \
 363         part_stat_add(cpu, gendiskp, field, 1)
 364 #define part_stat_sub(cpu, gendiskp, field, subnd)                      \
 365         part_stat_add(cpu, gendiskp, field, -subnd)
 366
 367 static inline void part_inc_in_flight(struct hd_struct *part, int rw)
 368 {
 369         atomic_inc(&part->in_flight[rw]);
 370         if (part->partno)
 371                 atomic_inc(&part_to_disk(part)->part0.in_flight[rw]);
 372 }
 373
 374 static inline void part_dec_in_flight(struct hd_struct *part, int rw)
 375 {
 376         atomic_dec(&part->in_flight[rw]);
 377         if (part->partno)
 378                 atomic_dec(&part_to_disk(part)->part0.in_flight[rw]);
 379 }
 380
 381 static inline int part_in_flight(struct hd_struct *part)
 382 {
 383         return atomic_read(&part->in_flight[0]) + atomic_read(&part->in_flight[1]);
 384 }
 385
 386 static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
 387 {
 388         if (disk)
 389                 return kzalloc_node(sizeof(struct partition_meta_info),
 390                                     GFP_KERNEL, disk->node_id);
 391         return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL);
 392 }
 393
 394 static inline void free_part_info(struct hd_struct *part)
 395 {
 396         kfree(part->info);
 397 }
 398
 399 /* block/blk-core.c */
 400 extern void part_round_stats(int cpu, struct hd_struct *part);
 401
 402 /* block/genhd.c */
 403 extern void add_disk(struct gendisk *disk);
 404 extern void del_gendisk(struct gendisk *gp);
 405 extern struct gendisk *get_gendisk(dev_t dev, int *partno);
 406 extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
 407
 408 extern void set_device_ro(struct block_device *bdev, int flag);
 409 extern void set_disk_ro(struct gendisk *disk, int flag);
 410
 411 static inline int get_disk_ro(struct gendisk *disk)
 412 {
 413         return disk->part0.policy;
 414 }
 415
 416 extern void disk_block_events(struct gendisk *disk);
 417 extern void disk_unblock_events(struct gendisk *disk);
 418 extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
 419 extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
 420
 421 /* drivers/char/random.c */
 422 extern void add_disk_randomness(struct gendisk *disk);
 423 extern void rand_initialize_disk(struct gendisk *disk);
 424
 425 static inline sector_t get_start_sect(struct block_device *bdev)
 426 {
 427         return bdev->bd_part->start_sect;
 428 }
 429 static inline sector_t get_capacity(struct gendisk *disk)
 430 {
 431         return disk->part0.nr_sects;
 432 }
 433 static inline void set_capacity(struct gendisk *disk, sector_t size)
 434 {
 435         disk->part0.nr_sects = size;
 436 }
 437
 438 #ifdef CONFIG_SOLARIS_X86_PARTITION
 439
 440 #define SOLARIS_X86_NUMSLICE    16
 441 #define SOLARIS_X86_VTOC_SANE   (0x600DDEEEUL)
 442
 443 struct solaris_x86_slice {
 444         __le16 s_tag;           /* ID tag of partition */
 445         __le16 s_flag;          /* permission flags */
 446         __le32 s_start;         /* start sector no of partition */
 447         __le32 s_size;          /* # of blocks in partition */
 448 };
 449
 450 struct solaris_x86_vtoc {
 451         unsigned int v_bootinfo[3];     /* info needed by mboot (unsupported) */
 452         __le32 v_sanity;                /* to verify vtoc sanity */
 453         __le32 v_version;               /* layout version */
 454         char    v_volume[8];            /* volume name */
 455         __le16  v_sectorsz;             /* sector size in bytes */
 456         __le16  v_nparts;               /* number of partitions */
 457         unsigned int v_reserved[10];    /* free space */
 458         struct solaris_x86_slice
 459                 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
 460         unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
 461         char    v_asciilabel[128];      /* for compatibility */
 462 };
 463
 464 #endif /* CONFIG_SOLARIS_X86_PARTITION */
 465
 466 #ifdef CONFIG_BSD_DISKLABEL
 467 /*
 468  * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
 469  * updated by Marc Espie <Marc.Espie@openbsd.org>
 470  */
 471
 472 /* check against BSD src/sys/sys/disklabel.h for consistency */
 473
 474 #define BSD_DISKMAGIC   (0x82564557UL)  /* The disk magic number */
 475 #define BSD_MAXPARTITIONS       16
 476 #define OPENBSD_MAXPARTITIONS   16
 477 #define BSD_FS_UNUSED           0       /* disklabel unused partition entry ID */
 478 struct bsd_disklabel {
 479         __le32  d_magic;                /* the magic number */
 480         __s16   d_type;                 /* drive type */
 481         __s16   d_subtype;              /* controller/d_type specific */
 482         char    d_typename[16];         /* type name, e.g. "eagle" */
 483         char    d_packname[16];                 /* pack identifier */
 484         __u32   d_secsize;              /* # of bytes per sector */
 485         __u32   d_nsectors;             /* # of data sectors per track */
 486         __u32   d_ntracks;              /* # of tracks per cylinder */
 487         __u32   d_ncylinders;           /* # of data cylinders per unit */
 488         __u32   d_secpercyl;            /* # of data sectors per cylinder */
 489         __u32   d_secperunit;           /* # of data sectors per unit */
 490         __u16   d_sparespertrack;       /* # of spare sectors per track */
 491         __u16   d_sparespercyl;         /* # of spare sectors per cylinder */
 492         __u32   d_acylinders;           /* # of alt. cylinders per unit */
 493         __u16   d_rpm;                  /* rotational speed */
 494         __u16   d_interleave;           /* hardware sector interleave */
 495         __u16   d_trackskew;            /* sector 0 skew, per track */
 496         __u16   d_cylskew;              /* sector 0 skew, per cylinder */
 497         __u32   d_headswitch;           /* head switch time, usec */
 498         __u32   d_trkseek;              /* track-to-track seek, usec */
 499         __u32   d_flags;                /* generic flags */
 500 #define NDDATA 5
 501         __u32   d_drivedata[NDDATA];    /* drive-type specific information */
 502 #define NSPARE 5
 503         __u32   d_spare[NSPARE];        /* reserved for future use */
 504         __le32  d_magic2;               /* the magic number (again) */
 505         __le16  d_checksum;             /* xor of data incl. partitions */
 506
 507                         /* filesystem and partition information: */
 508         __le16  d_npartitions;          /* number of partitions in following */
 509         __le32  d_bbsize;               /* size of boot area at sn0, bytes */
 510         __le32  d_sbsize;               /* max size of fs superblock, bytes */
 511         struct  bsd_partition {         /* the partition table */
 512                 __le32  p_size;         /* number of sectors in partition */
 513                 __le32  p_offset;       /* starting sector */
 514                 __le32  p_fsize;        /* filesystem basic fragment size */
 515                 __u8    p_fstype;       /* filesystem type, see below */
 516                 __u8    p_frag;         /* filesystem fragments per block */
 517                 __le16  p_cpg;          /* filesystem cylinders per group */
 518         } d_partitions[BSD_MAXPARTITIONS];      /* actually may be more */
 519 };
 520
 521 #endif  /* CONFIG_BSD_DISKLABEL */
 522
 523 #ifdef CONFIG_UNIXWARE_DISKLABEL
 524 /*
 525  * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
 526  * and Krzysztof G. Baranowski <kgb@knm.org.pl>
 527  */
 528
 529 #define UNIXWARE_DISKMAGIC     (0xCA5E600DUL)   /* The disk magic number */
 530 #define UNIXWARE_DISKMAGIC2    (0x600DDEEEUL)   /* The slice table magic nr */
 531 #define UNIXWARE_NUMSLICE      16
 532 #define UNIXWARE_FS_UNUSED     0                /* Unused slice entry ID */
 533
 534 struct unixware_slice {
 535         __le16   s_label;       /* label */
 536         __le16   s_flags;       /* permission flags */
 537         __le32   start_sect;    /* starting sector */
 538         __le32   nr_sects;      /* number of sectors in slice */
 539 };
 540
 541 struct unixware_disklabel {
 542         __le32   d_type;                /* drive type */
 543         __le32   d_magic;                /* the magic number */
 544         __le32   d_version;              /* version number */
 545         char    d_serial[12];           /* serial number of the device */
 546         __le32   d_ncylinders;           /* # of data cylinders per device */
 547         __le32   d_ntracks;              /* # of tracks per cylinder */
 548         __le32   d_nsectors;             /* # of data sectors per track */
 549         __le32   d_secsize;              /* # of bytes per sector */
 550         __le32   d_part_start;           /* # of first sector of this partition */
 551         __le32   d_unknown1[12];         /* ? */
 552         __le32  d_alt_tbl;              /* byte offset of alternate table */
 553         __le32  d_alt_len;              /* byte length of alternate table */
 554         __le32  d_phys_cyl;             /* # of physical cylinders per device */
 555         __le32  d_phys_trk;             /* # of physical tracks per cylinder */
 556         __le32  d_phys_sec;             /* # of physical sectors per track */
 557         __le32  d_phys_bytes;           /* # of physical bytes per sector */
 558         __le32  d_unknown2;             /* ? */
 559         __le32   d_unknown3;             /* ? */
 560         __le32  d_pad[8];               /* pad */
 561
 562         struct unixware_vtoc {
 563                 __le32  v_magic;                /* the magic number */
 564                 __le32  v_version;              /* version number */
 565                 char    v_name[8];              /* volume name */
 566                 __le16  v_nslices;              /* # of slices */
 567                 __le16  v_unknown1;             /* ? */
 568                 __le32  v_reserved[10];         /* reserved */
 569                 struct unixware_slice
 570                         v_slice[UNIXWARE_NUMSLICE];     /* slice headers */
 571         } vtoc;
 572
 573 };  /* 408 */
 574
 575 #endif /* CONFIG_UNIXWARE_DISKLABEL */
 576
 577 #ifdef CONFIG_MINIX_SUBPARTITION
 578 #   define MINIX_NR_SUBPARTITIONS  4
 579 #endif /* CONFIG_MINIX_SUBPARTITION */
 580
 581 #define ADDPART_FLAG_NONE       0
 582 #define ADDPART_FLAG_RAID       1
 583 #define ADDPART_FLAG_WHOLEDISK  2
 584
 585 extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
 586 extern void blk_free_devt(dev_t devt);
 587 extern dev_t blk_lookup_devt(const char *name, int partno);
 588 extern char *disk_name (struct gendisk *hd, int partno, char *buf);
 589
 590 extern int disk_expand_part_tbl(struct gendisk *disk, int target);
 591 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
 592 extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev);
 593 extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
 594                                                      int partno, sector_t start,
 595                                                      sector_t len, int flags,
 596                                                      struct partition_meta_info
 597                                                        *info);
 598 extern void __delete_partition(struct hd_struct *);
 599 extern void delete_partition(struct gendisk *, int);
 600 extern void printk_all_partitions(void);
 601
 602 extern struct gendisk *alloc_disk_node(int minors, int node_id);
 603 extern struct gendisk *alloc_disk(int minors);
 604 extern struct kobject *get_disk(struct gendisk *disk);
 605 extern void put_disk(struct gendisk *disk);
 606 extern void blk_register_region(dev_t devt, unsigned long range,
 607                         struct module *module,
 608                         struct kobject *(*probe)(dev_t, int *, void *),
 609                         int (*lock)(dev_t, void *),
 610                         void *data);
 611 extern void blk_unregister_region(dev_t devt, unsigned long range);
 612
 613 extern ssize_t part_size_show(struct device *dev,
 614                               struct device_attribute *attr, char *buf);
 615 extern ssize_t part_stat_show(struct device *dev,
 616                               struct device_attribute *attr, char *buf);
 617 extern ssize_t part_inflight_show(struct device *dev,
 618                               struct device_attribute *attr, char *buf);
 619 #ifdef CONFIG_FAIL_MAKE_REQUEST
 620 extern ssize_t part_fail_show(struct device *dev,
 621                               struct device_attribute *attr, char *buf);
 622 extern ssize_t part_fail_store(struct device *dev,
 623                                struct device_attribute *attr,
 624                                const char *buf, size_t count);
 625 #endif /* CONFIG_FAIL_MAKE_REQUEST */
 626
 627 static inline void hd_ref_init(struct hd_struct *part)
 628 {
 629         atomic_set(&part->ref, 1);
 630         smp_mb();
 631 }
 632
 633 static inline void hd_struct_get(struct hd_struct *part)
 634 {
 635         atomic_inc(&part->ref);
 636         smp_mb__after_atomic_inc();
 637 }
 638
 639 static inline int hd_struct_try_get(struct hd_struct *part)
 640 {
 641         return atomic_inc_not_zero(&part->ref);
 642 }
 643
 644 static inline void hd_struct_put(struct hd_struct *part)
 645 {
 646         if (atomic_dec_and_test(&part->ref))
 647                 __delete_partition(part);
 648 }
 649
 650 #else /* CONFIG_BLOCK */
 651
 652 static inline void printk_all_partitions(void) { }
 653
 654 static inline dev_t blk_lookup_devt(const char *name, int partno)
 655 {
 656         dev_t devt = MKDEV(0, 0);
 657         return devt;
 658 }
 659
 660 #endif /* CONFIG_BLOCK */
 661
 662 #endif /* _LINUX_GENHD_H */