include/linux/genhd.h

   1 #ifndef _LINUX_GENHD_H
   2 #define _LINUX_GENHD_H
   3
   4 /*
   5  *      genhd.h Copyright (C) 1992 Drew Eckhardt
   6  *      Generic hard disk header file by
   7  *              Drew Eckhardt
   8  *
   9  *              <drew@colorado.edu>
  10  */
  11
  12 #include <linux/types.h>
  13 #include <linux/kdev_t.h>
  14
  15 #ifdef CONFIG_BLOCK
  16
  17 #define kobj_to_dev(k) container_of(k, struct device, kobj)
  18 #define dev_to_disk(device) container_of(device, struct gendisk, dev)
  19 #define dev_to_part(device) container_of(device, struct hd_struct, dev)
  20
  21 extern struct device_type part_type;
  22 extern struct kobject *block_depr;
  23 extern struct class block_class;
  24
  25 extern const struct seq_operations partitions_op;
  26 extern const struct seq_operations diskstats_op;
  27
  28 enum {
  29 /* These three have identical behaviour; use the second one if DOS FDISK gets
  30    confused about extended/logical partitions starting past cylinder 1023. */
  31         DOS_EXTENDED_PARTITION = 5,
  32         LINUX_EXTENDED_PARTITION = 0x85,
  33         WIN98_EXTENDED_PARTITION = 0x0f,
  34
  35         SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
  36
  37         LINUX_SWAP_PARTITION = 0x82,
  38         LINUX_DATA_PARTITION = 0x83,
  39         LINUX_LVM_PARTITION = 0x8e,
  40         LINUX_RAID_PARTITION = 0xfd,    /* autodetect RAID partition */
  41
  42         SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
  43         NEW_SOLARIS_X86_PARTITION = 0xbf,
  44
  45         DM6_AUX1PARTITION = 0x51,       /* no DDO:  use xlated geom */
  46         DM6_AUX3PARTITION = 0x53,       /* no DDO:  use xlated geom */
  47         DM6_PARTITION = 0x54,           /* has DDO: use xlated geom & offset */
  48         EZD_PARTITION = 0x55,           /* EZ-DRIVE */
  49
  50         FREEBSD_PARTITION = 0xa5,       /* FreeBSD Partition ID */
  51         OPENBSD_PARTITION = 0xa6,       /* OpenBSD Partition ID */
  52         NETBSD_PARTITION = 0xa9,        /* NetBSD Partition ID */
  53         BSDI_PARTITION = 0xb7,          /* BSDI Partition ID */
  54         MINIX_PARTITION = 0x81,         /* Minix Partition ID */
  55         UNIXWARE_PARTITION = 0x63,      /* Same as GNU_HURD and SCO Unix */
  56 };
  57
  58 #include <linux/major.h>
  59 #include <linux/device.h>
  60 #include <linux/smp.h>
  61 #include <linux/string.h>
  62 #include <linux/fs.h>
  63 #include <linux/workqueue.h>
  64
  65 struct partition {
  66         unsigned char boot_ind;         /* 0x80 - active */
  67         unsigned char head;             /* starting head */
  68         unsigned char sector;           /* starting sector */
  69         unsigned char cyl;              /* starting cylinder */
  70         unsigned char sys_ind;          /* What partition type */
  71         unsigned char end_head;         /* end head */
  72         unsigned char end_sector;       /* end sector */
  73         unsigned char end_cyl;          /* end cylinder */
  74         __le32 start_sect;      /* starting sector counting from 0 */
  75         __le32 nr_sects;                /* nr of sectors in partition */
  76 } __attribute__((packed));
  77
  78 struct disk_stats {
  79         unsigned long sectors[2];       /* READs and WRITEs */
  80         unsigned long ios[2];
  81         unsigned long merges[2];
  82         unsigned long ticks[2];
  83         unsigned long io_ticks;
  84         unsigned long time_in_queue;
  85 };
  86
  87 struct hd_struct {
  88         sector_t start_sect;
  89         sector_t nr_sects;
  90         struct device dev;
  91         struct kobject *holder_dir;
  92         int policy, partno;
  93 #ifdef CONFIG_FAIL_MAKE_REQUEST
  94         int make_it_fail;
  95 #endif
  96         unsigned long stamp;
  97         int in_flight;
  98 #ifdef  CONFIG_SMP
  99         struct disk_stats *dkstats;
 100 #else
 101         struct disk_stats dkstats;
 102 #endif
 103 };
 104
 105 #define GENHD_FL_REMOVABLE                      1
 106 #define GENHD_FL_DRIVERFS                       2
 107 #define GENHD_FL_MEDIA_CHANGE_NOTIFY            4
 108 #define GENHD_FL_CD                             8
 109 #define GENHD_FL_UP                             16
 110 #define GENHD_FL_SUPPRESS_PARTITION_INFO        32
 111 #define GENHD_FL_FAIL                           64
 112
 113
 114 struct 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  */
 152 static 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
 179 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)       {
 180         int i;
 181
 182         for_each_possible_cpu(i)
 183                 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
 184                                 sizeof(struct disk_stats));
 185 }
 186
 187 #define __part_stat_add(part, field, addnd)                             \
 188         (per_cpu_ptr(part->dkstats, smp_processor_id())->field += addnd)
 189
 190 #define __all_stat_add(gendiskp, part, field, addnd, sector)    \
 191 ({                                                              \
 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
 206 static inline void part_stat_set_all(struct hd_struct *part, int value)
 207 {
 208         int i;
 209
 210         for_each_possible_cpu(i)
 211                 memset(per_cpu_ptr(part->dkstats, i), value,
 212                                 sizeof(struct disk_stats));
 213 }
 214
 215 #else /* !CONFIG_SMP */
 216 #define __disk_stat_add(gendiskp, field, addnd) \
 217                                 (gendiskp->dkstats.field += addnd)
 218 #define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
 219
 220 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
 221 {
 222         memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
 223 }
 224
 225 #define __part_stat_add(part, field, addnd) \
 226         (part->dkstats.field += addnd)
 227
 228 #define __all_stat_add(gendiskp, part, field, addnd, sector)    \
 229 ({                                                              \
 230         if (part)                                               \
 231                 part->dkstats.field += addnd;                   \
 232         __disk_stat_add(gendiskp, field, addnd);                \
 233 })
 234
 235 #define part_stat_read(part, field)     (part->dkstats.field)
 236
 237 static inline void part_stat_set_all(struct hd_struct *part, int value)
 238 {
 239         memset(&part->dkstats, value, sizeof(struct disk_stats));
 240 }
 241
 242 #endif /* CONFIG_SMP */
 243
 244 #define disk_stat_add(gendiskp, field, addnd)                   \
 245         do {                                                    \
 246                 preempt_disable();                              \
 247                 __disk_stat_add(gendiskp, field, addnd);        \
 248                 preempt_enable();                               \
 249         } while (0)
 250
 251 #define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
 252 #define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
 253
 254 #define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
 255 #define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
 256
 257 #define __disk_stat_sub(gendiskp, field, subnd) \
 258                 __disk_stat_add(gendiskp, field, -subnd)
 259 #define disk_stat_sub(gendiskp, field, subnd) \
 260                 disk_stat_add(gendiskp, field, -subnd)
 261
 262 #define part_stat_add(gendiskp, field, addnd)           \
 263         do {                                            \
 264                 preempt_disable();                      \
 265                 __part_stat_add(gendiskp, field, addnd);\
 266                 preempt_enable();                       \
 267         } while (0)
 268
 269 #define __part_stat_dec(gendiskp, field) __part_stat_add(gendiskp, field, -1)
 270 #define part_stat_dec(gendiskp, field) part_stat_add(gendiskp, field, -1)
 271
 272 #define __part_stat_inc(gendiskp, field) __part_stat_add(gendiskp, field, 1)
 273 #define part_stat_inc(gendiskp, field) part_stat_add(gendiskp, field, 1)
 274
 275 #define __part_stat_sub(gendiskp, field, subnd) \
 276                 __part_stat_add(gendiskp, field, -subnd)
 277 #define part_stat_sub(gendiskp, field, subnd) \
 278                 part_stat_add(gendiskp, field, -subnd)
 279
 280 #define all_stat_add(gendiskp, part, field, addnd, sector)      \
 281         do {                                                    \
 282                 preempt_disable();                              \
 283                 __all_stat_add(gendiskp, part, field, addnd, sector);   \
 284                 preempt_enable();                               \
 285         } while (0)
 286
 287 #define __all_stat_dec(gendiskp, field, sector) \
 288                 __all_stat_add(gendiskp, field, -1, sector)
 289 #define all_stat_dec(gendiskp, field, sector) \
 290                 all_stat_add(gendiskp, field, -1, sector)
 291
 292 #define __all_stat_inc(gendiskp, part, field, sector) \
 293                 __all_stat_add(gendiskp, part, field, 1, sector)
 294 #define all_stat_inc(gendiskp, part, field, sector) \
 295                 all_stat_add(gendiskp, part, field, 1, sector)
 296
 297 #define __all_stat_sub(gendiskp, part, field, subnd, sector) \
 298                 __all_stat_add(gendiskp, part, field, -subnd, sector)
 299 #define all_stat_sub(gendiskp, part, field, subnd, sector) \
 300                 all_stat_add(gendiskp, part, field, -subnd, sector)
 301
 302 /* Inlines to alloc and free disk stats in struct gendisk */
 303 #ifdef  CONFIG_SMP
 304 static inline int init_disk_stats(struct gendisk *disk)
 305 {
 306         disk->dkstats = alloc_percpu(struct disk_stats);
 307         if (!disk->dkstats)
 308                 return 0;
 309         return 1;
 310 }
 311
 312 static inline void free_disk_stats(struct gendisk *disk)
 313 {
 314         free_percpu(disk->dkstats);
 315 }
 316
 317 static inline int init_part_stats(struct hd_struct *part)
 318 {
 319         part->dkstats = alloc_percpu(struct disk_stats);
 320         if (!part->dkstats)
 321                 return 0;
 322         return 1;
 323 }
 324
 325 static inline void free_part_stats(struct hd_struct *part)
 326 {
 327         free_percpu(part->dkstats);
 328 }
 329
 330 #else   /* CONFIG_SMP */
 331 static inline int init_disk_stats(struct gendisk *disk)
 332 {
 333         return 1;
 334 }
 335
 336 static inline void free_disk_stats(struct gendisk *disk)
 337 {
 338 }
 339
 340 static inline int init_part_stats(struct hd_struct *part)
 341 {
 342         return 1;
 343 }
 344
 345 static inline void free_part_stats(struct hd_struct *part)
 346 {
 347 }
 348 #endif  /* CONFIG_SMP */
 349
 350 /* drivers/block/ll_rw_blk.c */
 351 extern void disk_round_stats(struct gendisk *disk);
 352 extern void part_round_stats(struct hd_struct *part);
 353
 354 /* drivers/block/genhd.c */
 355 extern int get_blkdev_list(char *, int);
 356 extern void add_disk(struct gendisk *disk);
 357 extern void del_gendisk(struct gendisk *gp);
 358 extern void unlink_gendisk(struct gendisk *gp);
 359 extern struct gendisk *get_gendisk(dev_t dev, int *part);
 360
 361 extern void set_device_ro(struct block_device *bdev, int flag);
 362 extern void set_disk_ro(struct gendisk *disk, int flag);
 363
 364 /* drivers/char/random.c */
 365 extern void add_disk_randomness(struct gendisk *disk);
 366 extern void rand_initialize_disk(struct gendisk *disk);
 367
 368 static inline sector_t get_start_sect(struct block_device *bdev)
 369 {
 370         return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
 371 }
 372 static inline sector_t get_capacity(struct gendisk *disk)
 373 {
 374         return disk->capacity;
 375 }
 376 static inline void set_capacity(struct gendisk *disk, sector_t size)
 377 {
 378         disk->capacity = size;
 379 }
 380
 381 #ifdef CONFIG_SOLARIS_X86_PARTITION
 382
 383 #define SOLARIS_X86_NUMSLICE    16
 384 #define SOLARIS_X86_VTOC_SANE   (0x600DDEEEUL)
 385
 386 struct solaris_x86_slice {
 387         __le16 s_tag;           /* ID tag of partition */
 388         __le16 s_flag;          /* permission flags */
 389         __le32 s_start;         /* start sector no of partition */
 390         __le32 s_size;          /* # of blocks in partition */
 391 };
 392
 393 struct solaris_x86_vtoc {
 394         unsigned int v_bootinfo[3];     /* info needed by mboot (unsupported) */
 395         __le32 v_sanity;                /* to verify vtoc sanity */
 396         __le32 v_version;               /* layout version */
 397         char    v_volume[8];            /* volume name */
 398         __le16  v_sectorsz;             /* sector size in bytes */
 399         __le16  v_nparts;               /* number of partitions */
 400         unsigned int v_reserved[10];    /* free space */
 401         struct solaris_x86_slice
 402                 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
 403         unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
 404         char    v_asciilabel[128];      /* for compatibility */
 405 };
 406
 407 #endif /* CONFIG_SOLARIS_X86_PARTITION */
 408
 409 #ifdef CONFIG_BSD_DISKLABEL
 410 /*
 411  * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
 412  * updated by Marc Espie <Marc.Espie@openbsd.org>
 413  */
 414
 415 /* check against BSD src/sys/sys/disklabel.h for consistency */
 416
 417 #define BSD_DISKMAGIC   (0x82564557UL)  /* The disk magic number */
 418 #define BSD_MAXPARTITIONS       16
 419 #define OPENBSD_MAXPARTITIONS   16
 420 #define BSD_FS_UNUSED           0       /* disklabel unused partition entry ID */
 421 struct bsd_disklabel {
 422         __le32  d_magic;                /* the magic number */
 423         __s16   d_type;                 /* drive type */
 424         __s16   d_subtype;              /* controller/d_type specific */
 425         char    d_typename[16];         /* type name, e.g. "eagle" */
 426         char    d_packname[16];                 /* pack identifier */
 427         __u32   d_secsize;              /* # of bytes per sector */
 428         __u32   d_nsectors;             /* # of data sectors per track */
 429         __u32   d_ntracks;              /* # of tracks per cylinder */
 430         __u32   d_ncylinders;           /* # of data cylinders per unit */
 431         __u32   d_secpercyl;            /* # of data sectors per cylinder */
 432         __u32   d_secperunit;           /* # of data sectors per unit */
 433         __u16   d_sparespertrack;       /* # of spare sectors per track */
 434         __u16   d_sparespercyl;         /* # of spare sectors per cylinder */
 435         __u32   d_acylinders;           /* # of alt. cylinders per unit */
 436         __u16   d_rpm;                  /* rotational speed */
 437         __u16   d_interleave;           /* hardware sector interleave */
 438         __u16   d_trackskew;            /* sector 0 skew, per track */
 439         __u16   d_cylskew;              /* sector 0 skew, per cylinder */
 440         __u32   d_headswitch;           /* head switch time, usec */
 441         __u32   d_trkseek;              /* track-to-track seek, usec */
 442         __u32   d_flags;                /* generic flags */
 443 #define NDDATA 5
 444         __u32   d_drivedata[NDDATA];    /* drive-type specific information */
 445 #define NSPARE 5
 446         __u32   d_spare[NSPARE];        /* reserved for future use */
 447         __le32  d_magic2;               /* the magic number (again) */
 448         __le16  d_checksum;             /* xor of data incl. partitions */
 449
 450                         /* filesystem and partition information: */
 451         __le16  d_npartitions;          /* number of partitions in following */
 452         __le32  d_bbsize;               /* size of boot area at sn0, bytes */
 453         __le32  d_sbsize;               /* max size of fs superblock, bytes */
 454         struct  bsd_partition {         /* the partition table */
 455                 __le32  p_size;         /* number of sectors in partition */
 456                 __le32  p_offset;       /* starting sector */
 457                 __le32  p_fsize;        /* filesystem basic fragment size */
 458                 __u8    p_fstype;       /* filesystem type, see below */
 459                 __u8    p_frag;         /* filesystem fragments per block */
 460                 __le16  p_cpg;          /* filesystem cylinders per group */
 461         } d_partitions[BSD_MAXPARTITIONS];      /* actually may be more */
 462 };
 463
 464 #endif  /* CONFIG_BSD_DISKLABEL */
 465
 466 #ifdef CONFIG_UNIXWARE_DISKLABEL
 467 /*
 468  * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
 469  * and Krzysztof G. Baranowski <kgb@knm.org.pl>
 470  */
 471
 472 #define UNIXWARE_DISKMAGIC     (0xCA5E600DUL)   /* The disk magic number */
 473 #define UNIXWARE_DISKMAGIC2    (0x600DDEEEUL)   /* The slice table magic nr */
 474 #define UNIXWARE_NUMSLICE      16
 475 #define UNIXWARE_FS_UNUSED     0                /* Unused slice entry ID */
 476
 477 struct unixware_slice {
 478         __le16   s_label;       /* label */
 479         __le16   s_flags;       /* permission flags */
 480         __le32   start_sect;    /* starting sector */
 481         __le32   nr_sects;      /* number of sectors in slice */
 482 };
 483
 484 struct unixware_disklabel {
 485         __le32   d_type;                /* drive type */
 486         __le32   d_magic;                /* the magic number */
 487         __le32   d_version;              /* version number */
 488         char    d_serial[12];           /* serial number of the device */
 489         __le32   d_ncylinders;           /* # of data cylinders per device */
 490         __le32   d_ntracks;              /* # of tracks per cylinder */
 491         __le32   d_nsectors;             /* # of data sectors per track */
 492         __le32   d_secsize;              /* # of bytes per sector */
 493         __le32   d_part_start;           /* # of first sector of this partition */
 494         __le32   d_unknown1[12];         /* ? */
 495         __le32  d_alt_tbl;              /* byte offset of alternate table */
 496         __le32  d_alt_len;              /* byte length of alternate table */
 497         __le32  d_phys_cyl;             /* # of physical cylinders per device */
 498         __le32  d_phys_trk;             /* # of physical tracks per cylinder */
 499         __le32  d_phys_sec;             /* # of physical sectors per track */
 500         __le32  d_phys_bytes;           /* # of physical bytes per sector */
 501         __le32  d_unknown2;             /* ? */
 502         __le32   d_unknown3;             /* ? */
 503         __le32  d_pad[8];               /* pad */
 504
 505         struct unixware_vtoc {
 506                 __le32  v_magic;                /* the magic number */
 507                 __le32  v_version;              /* version number */
 508                 char    v_name[8];              /* volume name */
 509                 __le16  v_nslices;              /* # of slices */
 510                 __le16  v_unknown1;             /* ? */
 511                 __le32  v_reserved[10];         /* reserved */
 512                 struct unixware_slice
 513                         v_slice[UNIXWARE_NUMSLICE];     /* slice headers */
 514         } vtoc;
 515
 516 };  /* 408 */
 517
 518 #endif /* CONFIG_UNIXWARE_DISKLABEL */
 519
 520 #ifdef CONFIG_MINIX_SUBPARTITION
 521 #   define MINIX_NR_SUBPARTITIONS  4
 522 #endif /* CONFIG_MINIX_SUBPARTITION */
 523
 524 #define ADDPART_FLAG_NONE       0
 525 #define ADDPART_FLAG_RAID       1
 526 #define ADDPART_FLAG_WHOLEDISK  2
 527
 528 extern dev_t blk_lookup_devt(const char *name, int part);
 529 extern char *disk_name (struct gendisk *hd, int part, char *buf);
 530
 531 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
 532 extern void add_partition(struct gendisk *, int, sector_t, sector_t, int);
 533 extern void delete_partition(struct gendisk *, int);
 534 extern void printk_all_partitions(void);
 535
 536 extern struct gendisk *alloc_disk_node(int minors, int node_id);
 537 extern struct gendisk *alloc_disk(int minors);
 538 extern struct kobject *get_disk(struct gendisk *disk);
 539 extern void put_disk(struct gendisk *disk);
 540 extern void blk_register_region(dev_t devt, unsigned long range,
 541                         struct module *module,
 542                         struct kobject *(*probe)(dev_t, int *, void *),
 543                         int (*lock)(dev_t, void *),
 544                         void *data);
 545 extern void blk_unregister_region(dev_t devt, unsigned long range);
 546
 547 static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
 548 {
 549         return bdget(MKDEV(disk->major, disk->first_minor) + index);
 550 }
 551
 552 #else /* CONFIG_BLOCK */
 553
 554 static inline void printk_all_partitions(void) { }
 555
 556 static inline dev_t blk_lookup_devt(const char *name, int part)
 557 {
 558         dev_t devt = MKDEV(0, 0);
 559         return devt;
 560 }
 561
 562 #endif /* CONFIG_BLOCK */
 563
 564 #endif /* _LINUX_GENHD_H */