5 * genhd.h Copyright (C) 1992 Drew Eckhardt
6 * Generic hard disk header file by
12 #include <linux/types.h>
13 #include <linux/kdev_t.h>
14 #include <linux/rcupdate.h>
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))
24 extern struct device_type part_type
;
25 extern struct kobject
*block_depr
;
26 extern struct class block_class
;
28 extern const struct seq_operations partitions_op
;
29 extern const struct seq_operations diskstats_op
;
32 /* These three have identical behaviour; use the second one if DOS FDISK gets
33 confused about extended/logical partitions starting past cylinder 1023. */
34 DOS_EXTENDED_PARTITION
= 5,
35 LINUX_EXTENDED_PARTITION
= 0x85,
36 WIN98_EXTENDED_PARTITION
= 0x0f,
38 SUN_WHOLE_DISK
= DOS_EXTENDED_PARTITION
,
40 LINUX_SWAP_PARTITION
= 0x82,
41 LINUX_DATA_PARTITION
= 0x83,
42 LINUX_LVM_PARTITION
= 0x8e,
43 LINUX_RAID_PARTITION
= 0xfd, /* autodetect RAID partition */
45 SOLARIS_X86_PARTITION
= LINUX_SWAP_PARTITION
,
46 NEW_SOLARIS_X86_PARTITION
= 0xbf,
48 DM6_AUX1PARTITION
= 0x51, /* no DDO: use xlated geom */
49 DM6_AUX3PARTITION
= 0x53, /* no DDO: use xlated geom */
50 DM6_PARTITION
= 0x54, /* has DDO: use xlated geom & offset */
51 EZD_PARTITION
= 0x55, /* EZ-DRIVE */
53 FREEBSD_PARTITION
= 0xa5, /* FreeBSD Partition ID */
54 OPENBSD_PARTITION
= 0xa6, /* OpenBSD Partition ID */
55 NETBSD_PARTITION
= 0xa9, /* NetBSD Partition ID */
56 BSDI_PARTITION
= 0xb7, /* BSDI Partition ID */
57 MINIX_PARTITION
= 0x81, /* Minix Partition ID */
58 UNIXWARE_PARTITION
= 0x63, /* Same as GNU_HURD and SCO Unix */
61 #include <linux/major.h>
62 #include <linux/device.h>
63 #include <linux/smp.h>
64 #include <linux/string.h>
66 #include <linux/workqueue.h>
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
));
82 unsigned long sectors
[2]; /* READs and WRITEs */
84 unsigned long merges
[2];
85 unsigned long ticks
[2];
86 unsigned long io_ticks
;
87 unsigned long time_in_queue
;
94 struct kobject
*holder_dir
;
96 #ifdef CONFIG_FAIL_MAKE_REQUEST
102 struct disk_stats
*dkstats
;
104 struct disk_stats dkstats
;
106 struct rcu_head rcu_head
;
109 #define GENHD_FL_REMOVABLE 1
110 #define GENHD_FL_DRIVERFS 2
111 #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
112 #define GENHD_FL_CD 8
113 #define GENHD_FL_UP 16
114 #define GENHD_FL_SUPPRESS_PARTITION_INFO 32
115 #define GENHD_FL_FAIL 64
118 /* major, first_minor, minors and ext_minors are input
119 * parameters only, don't use directly. Use disk_devt() and
122 int major
; /* major number of driver */
124 int minors
; /* maximum number of minors, =1 for
125 * disks that can't be partitioned. */
126 int ext_minors
; /* number of extended dynamic minors */
128 char disk_name
[32]; /* name of major driver */
130 /* Array of pointers to partitions indexed by partno.
131 * Protected with matching bdev lock but stat and other
132 * non-critical accesses use RCU. Always access through
135 struct hd_struct
**__part
;
136 struct hd_struct part0
;
138 struct block_device_operations
*fops
;
139 struct request_queue
*queue
;
143 struct device
*driverfs_dev
; // FIXME: remove
144 struct kobject
*slave_dir
;
146 struct timer_rand_state
*random
;
148 atomic_t sync_io
; /* RAID */
152 struct disk_stats
*dkstats
;
154 struct disk_stats dkstats
;
156 struct work_struct async_notify
;
157 #ifdef CONFIG_BLK_DEV_INTEGRITY
158 struct blk_integrity
*integrity
;
162 static inline struct gendisk
*part_to_disk(struct hd_struct
*part
)
166 return dev_to_disk(part_to_dev(part
)->parent
);
168 return dev_to_disk(part_to_dev(part
));
173 static inline int disk_max_parts(struct gendisk
*disk
)
175 return disk
->minors
+ disk
->ext_minors
;
178 static inline bool disk_partitionable(struct gendisk
*disk
)
180 return disk_max_parts(disk
) > 1;
183 static inline dev_t
disk_devt(struct gendisk
*disk
)
185 return disk_to_dev(disk
)->devt
;
188 static inline dev_t
part_devt(struct hd_struct
*part
)
190 return part_to_dev(part
)->devt
;
193 extern struct hd_struct
*disk_get_part(struct gendisk
*disk
, int partno
);
195 static inline void disk_put_part(struct hd_struct
*part
)
198 put_device(part_to_dev(part
));
202 * Smarter partition iterator without context limits.
204 #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
205 #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
206 #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
208 struct disk_part_iter
{
209 struct gendisk
*disk
;
210 struct hd_struct
*part
;
215 extern void disk_part_iter_init(struct disk_part_iter
*piter
,
216 struct gendisk
*disk
, unsigned int flags
);
217 extern struct hd_struct
*disk_part_iter_next(struct disk_part_iter
*piter
);
218 extern void disk_part_iter_exit(struct disk_part_iter
*piter
);
220 extern struct hd_struct
*disk_map_sector_rcu(struct gendisk
*disk
,
224 * Macros to operate on percpu disk statistics:
226 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
227 * and should be called between disk_stat_lock() and
228 * disk_stat_unlock().
230 * part_stat_read() can be called at any time.
232 * part_stat_{add|set_all}() and {init|free}_part_stats are for
236 #define disk_stat_lock() ({ rcu_read_lock(); get_cpu(); })
237 #define disk_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
239 #define disk_stat_add(cpu, gendiskp, field, addnd) \
240 (per_cpu_ptr(gendiskp->dkstats, cpu)->field += addnd)
242 #define disk_stat_read(gendiskp, field) \
244 typeof(gendiskp->dkstats->field) res = 0; \
246 for_each_possible_cpu(i) \
247 res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
251 static inline void disk_stat_set_all(struct gendisk
*gendiskp
, int value
)
255 for_each_possible_cpu(i
)
256 memset(per_cpu_ptr(gendiskp
->dkstats
, i
), value
,
257 sizeof(struct disk_stats
));
260 #define part_stat_add(cpu, part, field, addnd) \
261 (per_cpu_ptr(part->dkstats, cpu)->field += addnd)
263 #define all_stat_add(cpu, gendiskp, part, field, addnd, sector) \
266 part_stat_add(cpu, part, field, addnd); \
267 disk_stat_add(cpu, gendiskp, field, addnd); \
270 #define part_stat_read(part, field) \
272 typeof(part->dkstats->field) res = 0; \
274 for_each_possible_cpu(i) \
275 res += per_cpu_ptr(part->dkstats, i)->field; \
279 static inline void part_stat_set_all(struct hd_struct
*part
, int value
)
283 for_each_possible_cpu(i
)
284 memset(per_cpu_ptr(part
->dkstats
, i
), value
,
285 sizeof(struct disk_stats
));
288 #else /* !CONFIG_SMP */
289 #define disk_stat_lock() ({ rcu_read_lock(); 0; })
290 #define disk_stat_unlock() rcu_read_unlock()
292 #define disk_stat_add(cpu, gendiskp, field, addnd) \
293 (gendiskp->dkstats.field += addnd)
294 #define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
296 static inline void disk_stat_set_all(struct gendisk
*gendiskp
, int value
)
298 memset(&gendiskp
->dkstats
, value
, sizeof (struct disk_stats
));
301 #define part_stat_add(cpu, part, field, addnd) \
302 (part->dkstats.field += addnd)
304 #define all_stat_add(cpu, gendiskp, part, field, addnd, sector) \
307 part_stat_add(cpu, part, field, addnd); \
308 disk_stat_add(cpu, gendiskp, field, addnd); \
311 #define part_stat_read(part, field) (part->dkstats.field)
313 static inline void part_stat_set_all(struct hd_struct
*part
, int value
)
315 memset(&part
->dkstats
, value
, sizeof(struct disk_stats
));
318 #endif /* CONFIG_SMP */
320 #define disk_stat_dec(cpu, gendiskp, field) \
321 disk_stat_add(cpu, gendiskp, field, -1)
322 #define disk_stat_inc(cpu, gendiskp, field) \
323 disk_stat_add(cpu, gendiskp, field, 1)
324 #define disk_stat_sub(cpu, gendiskp, field, subnd) \
325 disk_stat_add(cpu, gendiskp, field, -subnd)
327 #define part_stat_dec(cpu, gendiskp, field) \
328 part_stat_add(cpu, gendiskp, field, -1)
329 #define part_stat_inc(cpu, gendiskp, field) \
330 part_stat_add(cpu, gendiskp, field, 1)
331 #define part_stat_sub(cpu, gendiskp, field, subnd) \
332 part_stat_add(cpu, gendiskp, field, -subnd)
334 #define all_stat_dec(cpu, gendiskp, field, sector) \
335 all_stat_add(cpu, gendiskp, field, -1, sector)
336 #define all_stat_inc(cpu, gendiskp, part, field, sector) \
337 all_stat_add(cpu, gendiskp, part, field, 1, sector)
338 #define all_stat_sub(cpu, gendiskp, part, field, subnd, sector) \
339 all_stat_add(cpu, gendiskp, part, field, -subnd, sector)
341 /* Inlines to alloc and free disk stats in struct gendisk */
343 static inline int init_disk_stats(struct gendisk
*disk
)
345 disk
->dkstats
= alloc_percpu(struct disk_stats
);
351 static inline void free_disk_stats(struct gendisk
*disk
)
353 free_percpu(disk
->dkstats
);
356 static inline int init_part_stats(struct hd_struct
*part
)
358 part
->dkstats
= alloc_percpu(struct disk_stats
);
364 static inline void free_part_stats(struct hd_struct
*part
)
366 free_percpu(part
->dkstats
);
369 #else /* CONFIG_SMP */
370 static inline int init_disk_stats(struct gendisk
*disk
)
375 static inline void free_disk_stats(struct gendisk
*disk
)
379 static inline int init_part_stats(struct hd_struct
*part
)
384 static inline void free_part_stats(struct hd_struct
*part
)
387 #endif /* CONFIG_SMP */
389 /* drivers/block/ll_rw_blk.c */
390 extern void disk_round_stats(int cpu
, struct gendisk
*disk
);
391 extern void part_round_stats(int cpu
, struct hd_struct
*part
);
393 /* drivers/block/genhd.c */
394 extern int get_blkdev_list(char *, int);
395 extern void add_disk(struct gendisk
*disk
);
396 extern void del_gendisk(struct gendisk
*gp
);
397 extern void unlink_gendisk(struct gendisk
*gp
);
398 extern struct gendisk
*get_gendisk(dev_t dev
, int *partno
);
399 extern struct block_device
*bdget_disk(struct gendisk
*disk
, int partno
);
401 extern void set_device_ro(struct block_device
*bdev
, int flag
);
402 extern void set_disk_ro(struct gendisk
*disk
, int flag
);
404 static inline int get_disk_ro(struct gendisk
*disk
)
406 return disk
->part0
.policy
;
409 /* drivers/char/random.c */
410 extern void add_disk_randomness(struct gendisk
*disk
);
411 extern void rand_initialize_disk(struct gendisk
*disk
);
413 static inline sector_t
get_start_sect(struct block_device
*bdev
)
415 return bdev
->bd_part
->start_sect
;
417 static inline sector_t
get_capacity(struct gendisk
*disk
)
419 return disk
->part0
.nr_sects
;
421 static inline void set_capacity(struct gendisk
*disk
, sector_t size
)
423 disk
->part0
.nr_sects
= size
;
426 #ifdef CONFIG_SOLARIS_X86_PARTITION
428 #define SOLARIS_X86_NUMSLICE 16
429 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
431 struct solaris_x86_slice
{
432 __le16 s_tag
; /* ID tag of partition */
433 __le16 s_flag
; /* permission flags */
434 __le32 s_start
; /* start sector no of partition */
435 __le32 s_size
; /* # of blocks in partition */
438 struct solaris_x86_vtoc
{
439 unsigned int v_bootinfo
[3]; /* info needed by mboot (unsupported) */
440 __le32 v_sanity
; /* to verify vtoc sanity */
441 __le32 v_version
; /* layout version */
442 char v_volume
[8]; /* volume name */
443 __le16 v_sectorsz
; /* sector size in bytes */
444 __le16 v_nparts
; /* number of partitions */
445 unsigned int v_reserved
[10]; /* free space */
446 struct solaris_x86_slice
447 v_slice
[SOLARIS_X86_NUMSLICE
]; /* slice headers */
448 unsigned int timestamp
[SOLARIS_X86_NUMSLICE
]; /* timestamp (unsupported) */
449 char v_asciilabel
[128]; /* for compatibility */
452 #endif /* CONFIG_SOLARIS_X86_PARTITION */
454 #ifdef CONFIG_BSD_DISKLABEL
456 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
457 * updated by Marc Espie <Marc.Espie@openbsd.org>
460 /* check against BSD src/sys/sys/disklabel.h for consistency */
462 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
463 #define BSD_MAXPARTITIONS 16
464 #define OPENBSD_MAXPARTITIONS 16
465 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
466 struct bsd_disklabel
{
467 __le32 d_magic
; /* the magic number */
468 __s16 d_type
; /* drive type */
469 __s16 d_subtype
; /* controller/d_type specific */
470 char d_typename
[16]; /* type name, e.g. "eagle" */
471 char d_packname
[16]; /* pack identifier */
472 __u32 d_secsize
; /* # of bytes per sector */
473 __u32 d_nsectors
; /* # of data sectors per track */
474 __u32 d_ntracks
; /* # of tracks per cylinder */
475 __u32 d_ncylinders
; /* # of data cylinders per unit */
476 __u32 d_secpercyl
; /* # of data sectors per cylinder */
477 __u32 d_secperunit
; /* # of data sectors per unit */
478 __u16 d_sparespertrack
; /* # of spare sectors per track */
479 __u16 d_sparespercyl
; /* # of spare sectors per cylinder */
480 __u32 d_acylinders
; /* # of alt. cylinders per unit */
481 __u16 d_rpm
; /* rotational speed */
482 __u16 d_interleave
; /* hardware sector interleave */
483 __u16 d_trackskew
; /* sector 0 skew, per track */
484 __u16 d_cylskew
; /* sector 0 skew, per cylinder */
485 __u32 d_headswitch
; /* head switch time, usec */
486 __u32 d_trkseek
; /* track-to-track seek, usec */
487 __u32 d_flags
; /* generic flags */
489 __u32 d_drivedata
[NDDATA
]; /* drive-type specific information */
491 __u32 d_spare
[NSPARE
]; /* reserved for future use */
492 __le32 d_magic2
; /* the magic number (again) */
493 __le16 d_checksum
; /* xor of data incl. partitions */
495 /* filesystem and partition information: */
496 __le16 d_npartitions
; /* number of partitions in following */
497 __le32 d_bbsize
; /* size of boot area at sn0, bytes */
498 __le32 d_sbsize
; /* max size of fs superblock, bytes */
499 struct bsd_partition
{ /* the partition table */
500 __le32 p_size
; /* number of sectors in partition */
501 __le32 p_offset
; /* starting sector */
502 __le32 p_fsize
; /* filesystem basic fragment size */
503 __u8 p_fstype
; /* filesystem type, see below */
504 __u8 p_frag
; /* filesystem fragments per block */
505 __le16 p_cpg
; /* filesystem cylinders per group */
506 } d_partitions
[BSD_MAXPARTITIONS
]; /* actually may be more */
509 #endif /* CONFIG_BSD_DISKLABEL */
511 #ifdef CONFIG_UNIXWARE_DISKLABEL
513 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
514 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
517 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
518 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
519 #define UNIXWARE_NUMSLICE 16
520 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
522 struct unixware_slice
{
523 __le16 s_label
; /* label */
524 __le16 s_flags
; /* permission flags */
525 __le32 start_sect
; /* starting sector */
526 __le32 nr_sects
; /* number of sectors in slice */
529 struct unixware_disklabel
{
530 __le32 d_type
; /* drive type */
531 __le32 d_magic
; /* the magic number */
532 __le32 d_version
; /* version number */
533 char d_serial
[12]; /* serial number of the device */
534 __le32 d_ncylinders
; /* # of data cylinders per device */
535 __le32 d_ntracks
; /* # of tracks per cylinder */
536 __le32 d_nsectors
; /* # of data sectors per track */
537 __le32 d_secsize
; /* # of bytes per sector */
538 __le32 d_part_start
; /* # of first sector of this partition */
539 __le32 d_unknown1
[12]; /* ? */
540 __le32 d_alt_tbl
; /* byte offset of alternate table */
541 __le32 d_alt_len
; /* byte length of alternate table */
542 __le32 d_phys_cyl
; /* # of physical cylinders per device */
543 __le32 d_phys_trk
; /* # of physical tracks per cylinder */
544 __le32 d_phys_sec
; /* # of physical sectors per track */
545 __le32 d_phys_bytes
; /* # of physical bytes per sector */
546 __le32 d_unknown2
; /* ? */
547 __le32 d_unknown3
; /* ? */
548 __le32 d_pad
[8]; /* pad */
550 struct unixware_vtoc
{
551 __le32 v_magic
; /* the magic number */
552 __le32 v_version
; /* version number */
553 char v_name
[8]; /* volume name */
554 __le16 v_nslices
; /* # of slices */
555 __le16 v_unknown1
; /* ? */
556 __le32 v_reserved
[10]; /* reserved */
557 struct unixware_slice
558 v_slice
[UNIXWARE_NUMSLICE
]; /* slice headers */
563 #endif /* CONFIG_UNIXWARE_DISKLABEL */
565 #ifdef CONFIG_MINIX_SUBPARTITION
566 # define MINIX_NR_SUBPARTITIONS 4
567 #endif /* CONFIG_MINIX_SUBPARTITION */
569 #define ADDPART_FLAG_NONE 0
570 #define ADDPART_FLAG_RAID 1
571 #define ADDPART_FLAG_WHOLEDISK 2
573 extern int blk_alloc_devt(struct hd_struct
*part
, dev_t
*devt
);
574 extern void blk_free_devt(dev_t devt
);
575 extern dev_t
blk_lookup_devt(const char *name
, int partno
);
576 extern char *disk_name (struct gendisk
*hd
, int partno
, char *buf
);
578 extern int rescan_partitions(struct gendisk
*disk
, struct block_device
*bdev
);
579 extern int __must_check
add_partition(struct gendisk
*, int, sector_t
, sector_t
, int);
580 extern void delete_partition(struct gendisk
*, int);
581 extern void printk_all_partitions(void);
583 extern struct gendisk
*alloc_disk_node(int minors
, int node_id
);
584 extern struct gendisk
*alloc_disk(int minors
);
585 extern struct gendisk
*alloc_disk_ext_node(int minors
, int ext_minrs
,
587 extern struct gendisk
*alloc_disk_ext(int minors
, int ext_minors
);
588 extern struct kobject
*get_disk(struct gendisk
*disk
);
589 extern void put_disk(struct gendisk
*disk
);
590 extern void blk_register_region(dev_t devt
, unsigned long range
,
591 struct module
*module
,
592 struct kobject
*(*probe
)(dev_t
, int *, void *),
593 int (*lock
)(dev_t
, void *),
595 extern void blk_unregister_region(dev_t devt
, unsigned long range
);
597 extern ssize_t
part_size_show(struct device
*dev
,
598 struct device_attribute
*attr
, char *buf
);
600 #else /* CONFIG_BLOCK */
602 static inline void printk_all_partitions(void) { }
604 static inline dev_t
blk_lookup_devt(const char *name
, int partno
)
606 dev_t devt
= MKDEV(0, 0);
610 #endif /* CONFIG_BLOCK */
612 #endif /* _LINUX_GENHD_H */