LXR linux/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
  21extern struct device_type part_type;
  22extern struct kobject *block_depr;
  23extern struct class block_class;
  24
  25extern const struct seq_operations partitions_op;
  26extern const struct seq_operations diskstats_op;
  27
  28enum {
  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
  65struct 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
  78struct 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        
  87struct 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
 114struct gendisk {
 115        int major;                      /* major number of driver */
 116        int first_minor;
 117        int minors;                     /* maximum number of minors, =1 for
 118                                         * disks that can't be partitioned. */
 119        char disk_name[32];             /* name of major driver */
 120        struct hd_struct **part;        /* [indexed by minor] */
 121        struct block_device_operations *fops;
 122        struct request_queue *queue;
 123        void *private_data;
 124        sector_t capacity;
 125
 126        int flags;
 127        struct device *driverfs_dev;  // FIXME: remove
 128        struct device dev;
 129        struct kobject *holder_dir;
 130        struct kobject *slave_dir;
 131
 132        struct timer_rand_state *random;
 133        int policy;
 134
 135        atomic_t sync_io;               /* RAID */
 136        unsigned long stamp;
 137        int in_flight;
 138#ifdef  CONFIG_SMP
 139        struct disk_stats *dkstats;
 140#else
 141        struct disk_stats dkstats;
 142#endif
 143        struct work_struct async_notify;
 144};
 145
 146/* 
 147 * Macros to operate on percpu disk statistics:
 148 *
 149 * The __ variants should only be called in critical sections. The full
 150 * variants disable/enable preemption.
 151 */
 152static inline struct hd_struct *get_part(struct gendisk *gendiskp,
 153                                         sector_t sector)
 154{
 155        struct hd_struct *part;
 156        int i;
 157        for (i = 0; i < gendiskp->minors - 1; i++) {
 158                part = gendiskp->part[i];
 159                if (part && part->start_sect <= sector
 160                    && sector < part->start_sect + part->nr_sects)
 161                        return part;
 162        }
 163        return NULL;
 164}
 165
 166#ifdef  CONFIG_SMP
 167#define __disk_stat_add(gendiskp, field, addnd)         \
 168        (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
 169
 170#define disk_stat_read(gendiskp, field)                                 \
 171({                                                                      \
 172        typeof(gendiskp->dkstats->field) res = 0;                       \
 173        int i;                                                          \
 174        for_each_possible_cpu(i)                                        \
 175                res += per_cpu_ptr(gendiskp->dkstats, i)->field;        \
 176        res;                                                            \
 177})
 178
 179static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)       {
 180        int i;
 181        for_each_possible_cpu(i)
 182                memset(per_cpu_ptr(gendiskp->dkstats, i), value,
 183                                sizeof (struct disk_stats));
 184}               
 185
 186#define __part_stat_add(part, field, addnd)                             \
 187        (per_cpu_ptr(part->dkstats, smp_processor_id())->field += addnd)
 188
 189#define __all_stat_add(gendiskp, field, addnd, sector)          \
 190({                                                              \
 191        struct hd_struct *part = get_part(gendiskp, sector);    \
 192        if (part)                                               \
 193                __part_stat_add(part, field, addnd);            \
 194        __disk_stat_add(gendiskp, field, addnd);                \
 195})
 196
 197#define part_stat_read(part, field)                                     \
 198({                                                                      \
 199        typeof(part->dkstats->field) res = 0;                           \
 200        int i;                                                          \
 201        for_each_possible_cpu(i)                                        \
 202                res += per_cpu_ptr(part->dkstats, i)->field;            \
 203        res;                                                            \
 204})
 205
 206static inline void part_stat_set_all(struct hd_struct *part, int value) {
 207        int i;
 208        for_each_possible_cpu(i)
 209                memset(per_cpu_ptr(part->dkstats, i), value,
 210                       sizeof(struct disk_stats));
 211}
 212                                
 213#else /* !CONFIG_SMP */
 214#define __disk_stat_add(gendiskp, field, addnd) \
 215                                (gendiskp->dkstats.field += addnd)
 216#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
 217
 218static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
 219{
 220        memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
 221}
 222
 223#define __part_stat_add(part, field, addnd) \
 224        (part->dkstats.field += addnd)
 225
 226#define __all_stat_add(gendiskp, field, addnd, sector)          \
 227({                                                              \
 228        struct hd_struct *part = get_part(gendiskp, sector);    \
 229        if (part)                                               \
 230                part->dkstats.field += addnd;                   \
 231        __disk_stat_add(gendiskp, field, addnd);                \
 232})
 233
 234#define part_stat_read(part, field)     (part->dkstats.field)
 235
 236static inline void part_stat_set_all(struct hd_struct *part, int value)
 237{
 238        memset(&part->dkstats, value, sizeof(struct disk_stats));
 239}
 240
 241#endif /* CONFIG_SMP */
 242
 243#define disk_stat_add(gendiskp, field, addnd)                   \
 244        do {                                                    \
 245                preempt_disable();                              \
 246                __disk_stat_add(gendiskp, field, addnd);        \
 247                preempt_enable();                               \
 248        } while (0)
 249
 250#define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
 251#define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
 252
 253#define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
 254#define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
 255
 256#define __disk_stat_sub(gendiskp, field, subnd) \
 257                __disk_stat_add(gendiskp, field, -subnd)
 258#define disk_stat_sub(gendiskp, field, subnd) \
 259                disk_stat_add(gendiskp, field, -subnd)
 260
 261#define part_stat_add(gendiskp, field, addnd)           \
 262        do {                                            \
 263                preempt_disable();                      \
 264                __part_stat_add(gendiskp, field, addnd);\
 265                preempt_enable();                       \
 266        } while (0)
 267
 268#define __part_stat_dec(gendiskp, field) __part_stat_add(gendiskp, field, -1)
 269#define part_stat_dec(gendiskp, field) part_stat_add(gendiskp, field, -1)
 270
 271#define __part_stat_inc(gendiskp, field) __part_stat_add(gendiskp, field, 1)
 272#define part_stat_inc(gendiskp, field) part_stat_add(gendiskp, field, 1)
 273
 274#define __part_stat_sub(gendiskp, field, subnd) \
 275                __part_stat_add(gendiskp, field, -subnd)
 276#define part_stat_sub(gendiskp, field, subnd) \
 277                part_stat_add(gendiskp, field, -subnd)
 278
 279#define all_stat_add(gendiskp, field, addnd, sector)            \
 280        do {                                                    \
 281                preempt_disable();                              \
 282                __all_stat_add(gendiskp, field, addnd, sector); \
 283                preempt_enable();                               \
 284        } while (0)
 285
 286#define __all_stat_dec(gendiskp, field, sector) \
 287                __all_stat_add(gendiskp, field, -1, sector)
 288#define all_stat_dec(gendiskp, field, sector) \
 289                all_stat_add(gendiskp, field, -1, sector)
 290
 291#define __all_stat_inc(gendiskp, field, sector) \
 292                __all_stat_add(gendiskp, field, 1, sector)
 293#define all_stat_inc(gendiskp, field, sector) \
 294                all_stat_add(gendiskp, field, 1, sector)
 295
 296#define __all_stat_sub(gendiskp, field, subnd, sector) \
 297                __all_stat_add(gendiskp, field, -subnd, sector)
 298#define all_stat_sub(gendiskp, field, subnd, sector) \
 299                all_stat_add(gendiskp, field, -subnd, sector)
 300
 301/* Inlines to alloc and free disk stats in struct gendisk */
 302#ifdef  CONFIG_SMP
 303static inline int init_disk_stats(struct gendisk *disk)
 304{
 305        disk->dkstats = alloc_percpu(struct disk_stats);
 306        if (!disk->dkstats)
 307                return 0;
 308        return 1;
 309}
 310
 311static inline void free_disk_stats(struct gendisk *disk)
 312{
 313        free_percpu(disk->dkstats);
 314}
 315
 316static inline int init_part_stats(struct hd_struct *part)
 317{
 318        part->dkstats = alloc_percpu(struct disk_stats);
 319        if (!part->dkstats)
 320                return 0;
 321        return 1;
 322}
 323
 324static inline void free_part_stats(struct hd_struct *part)
 325{
 326        free_percpu(part->dkstats);
 327}
 328
 329#else   /* CONFIG_SMP */
 330static inline int init_disk_stats(struct gendisk *disk)
 331{
 332        return 1;
 333}
 334
 335static inline void free_disk_stats(struct gendisk *disk)
 336{
 337}
 338
 339static inline int init_part_stats(struct hd_struct *part)
 340{
 341        return 1;
 342}
 343
 344static inline void free_part_stats(struct hd_struct *part)
 345{
 346}
 347#endif  /* CONFIG_SMP */
 348
 349/* drivers/block/ll_rw_blk.c */
 350extern void disk_round_stats(struct gendisk *disk);
 351extern void part_round_stats(struct hd_struct *part);
 352
 353/* drivers/block/genhd.c */
 354extern int get_blkdev_list(char *, int);
 355extern void add_disk(struct gendisk *disk);
 356extern void del_gendisk(struct gendisk *gp);
 357extern void unlink_gendisk(struct gendisk *gp);
 358extern struct gendisk *get_gendisk(dev_t dev, int *part);
 359
 360extern void set_device_ro(struct block_device *bdev, int flag);
 361extern void set_disk_ro(struct gendisk *disk, int flag);
 362
 363/* drivers/char/random.c */
 364extern void add_disk_randomness(struct gendisk *disk);
 365extern void rand_initialize_disk(struct gendisk *disk);
 366
 367static inline sector_t get_start_sect(struct block_device *bdev)
 368{
 369        return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
 370}
 371static inline sector_t get_capacity(struct gendisk *disk)
 372{
 373        return disk->capacity;
 374}
 375static inline void set_capacity(struct gendisk *disk, sector_t size)
 376{
 377        disk->capacity = size;
 378}
 379
 380#ifdef CONFIG_SOLARIS_X86_PARTITION
 381
 382#define SOLARIS_X86_NUMSLICE    16
 383#define SOLARIS_X86_VTOC_SANE   (0x600DDEEEUL)
 384
 385struct 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
 392struct 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 */
 420struct 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
 476struct 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
 483struct 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
 527extern dev_t blk_lookup_devt(const char *name);
 528extern char *disk_name (struct gendisk *hd, int part, char *buf);
 529
 530extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
 531extern void add_partition(struct gendisk *, int, sector_t, sector_t, int);
 532extern void delete_partition(struct gendisk *, int);
 533extern void printk_all_partitions(void);
 534
 535extern struct gendisk *alloc_disk_node(int minors, int node_id);
 536extern struct gendisk *alloc_disk(int minors);
 537extern struct kobject *get_disk(struct gendisk *disk);
 538extern void put_disk(struct gendisk *disk);
 539extern void blk_register_region(dev_t devt, unsigned long range,
 540                        struct module *module,
 541                        struct kobject *(*probe)(dev_t, int *, void *),
 542                        int (*lock)(dev_t, void *),
 543                        void *data);
 544extern void blk_unregister_region(dev_t devt, unsigned long range);
 545
 546static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
 547{
 548        return bdget(MKDEV(disk->major, disk->first_minor) + index);
 549}
 550
 551#else /* CONFIG_BLOCK */
 552
 553static inline void printk_all_partitions(void) { }
 554
 555static inline dev_t blk_lookup_devt(const char *name)
 556{
 557        dev_t devt = MKDEV(0, 0);
 558        return devt;
 559}
 560
 561#endif /* CONFIG_BLOCK */
 562
 563#endif /* _LINUX_GENHD_H */
 564