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 #define DISK_MAX_PARTS 256
63 #include <linux/major.h>
64 #include <linux/device.h>
65 #include <linux/smp.h>
66 #include <linux/string.h>
68 #include <linux/workqueue.h>
71 unsigned char boot_ind
; /* 0x80 - active */
72 unsigned char head
; /* starting head */
73 unsigned char sector
; /* starting sector */
74 unsigned char cyl
; /* starting cylinder */
75 unsigned char sys_ind
; /* What partition type */
76 unsigned char end_head
; /* end head */
77 unsigned char end_sector
; /* end sector */
78 unsigned char end_cyl
; /* end cylinder */
79 __le32 start_sect
; /* starting sector counting from 0 */
80 __le32 nr_sects
; /* nr of sectors in partition */
81 } __attribute__((packed
));
84 unsigned long sectors
[2]; /* READs and WRITEs */
86 unsigned long merges
[2];
87 unsigned long ticks
[2];
88 unsigned long io_ticks
;
89 unsigned long time_in_queue
;
96 struct kobject
*holder_dir
;
98 #ifdef CONFIG_FAIL_MAKE_REQUEST
104 struct disk_stats
*dkstats
;
106 struct disk_stats dkstats
;
108 struct rcu_head rcu_head
;
111 #define GENHD_FL_REMOVABLE 1
112 #define GENHD_FL_DRIVERFS 2
113 #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
114 #define GENHD_FL_CD 8
115 #define GENHD_FL_UP 16
116 #define GENHD_FL_SUPPRESS_PARTITION_INFO 32
117 #define GENHD_FL_EXT_DEVT 64 /* allow extended devt */
119 #define BLK_SCSI_MAX_CMDS (256)
120 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
122 struct blk_scsi_cmd_filter
{
123 unsigned long read_ok
[BLK_SCSI_CMD_PER_LONG
];
124 unsigned long write_ok
[BLK_SCSI_CMD_PER_LONG
];
128 struct disk_part_tbl
{
129 struct rcu_head rcu_head
;
131 struct hd_struct
*part
[];
135 /* major, first_minor and minors are input parameters only,
136 * don't use directly. Use disk_devt() and disk_max_parts().
138 int major
; /* major number of driver */
140 int minors
; /* maximum number of minors, =1 for
141 * disks that can't be partitioned. */
143 char disk_name
[32]; /* name of major driver */
145 /* Array of pointers to partitions indexed by partno.
146 * Protected with matching bdev lock but stat and other
147 * non-critical accesses use RCU. Always access through
150 struct disk_part_tbl
*part_tbl
;
151 struct hd_struct part0
;
153 struct block_device_operations
*fops
;
154 struct request_queue
*queue
;
158 struct device
*driverfs_dev
; // FIXME: remove
159 struct kobject
*slave_dir
;
161 struct timer_rand_state
*random
;
163 atomic_t sync_io
; /* RAID */
164 struct work_struct async_notify
;
165 #ifdef CONFIG_BLK_DEV_INTEGRITY
166 struct blk_integrity
*integrity
;
171 static inline struct gendisk
*part_to_disk(struct hd_struct
*part
)
175 return dev_to_disk(part_to_dev(part
)->parent
);
177 return dev_to_disk(part_to_dev(part
));
182 static inline int disk_max_parts(struct gendisk
*disk
)
184 if (disk
->flags
& GENHD_FL_EXT_DEVT
)
185 return DISK_MAX_PARTS
;
189 static inline bool disk_partitionable(struct gendisk
*disk
)
191 return disk_max_parts(disk
) > 1;
194 static inline dev_t
disk_devt(struct gendisk
*disk
)
196 return disk_to_dev(disk
)->devt
;
199 static inline dev_t
part_devt(struct hd_struct
*part
)
201 return part_to_dev(part
)->devt
;
204 extern struct hd_struct
*disk_get_part(struct gendisk
*disk
, int partno
);
206 static inline void disk_put_part(struct hd_struct
*part
)
209 put_device(part_to_dev(part
));
213 * Smarter partition iterator without context limits.
215 #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
216 #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
217 #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
219 struct disk_part_iter
{
220 struct gendisk
*disk
;
221 struct hd_struct
*part
;
226 extern void disk_part_iter_init(struct disk_part_iter
*piter
,
227 struct gendisk
*disk
, unsigned int flags
);
228 extern struct hd_struct
*disk_part_iter_next(struct disk_part_iter
*piter
);
229 extern void disk_part_iter_exit(struct disk_part_iter
*piter
);
231 extern struct hd_struct
*disk_map_sector_rcu(struct gendisk
*disk
,
235 * Macros to operate on percpu disk statistics:
237 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
238 * and should be called between disk_stat_lock() and
239 * disk_stat_unlock().
241 * part_stat_read() can be called at any time.
243 * part_stat_{add|set_all}() and {init|free}_part_stats are for
247 #define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
248 #define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
250 #define __part_stat_add(cpu, part, field, addnd) \
251 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
253 #define part_stat_read(part, field) \
255 typeof((part)->dkstats->field) res = 0; \
257 for_each_possible_cpu(i) \
258 res += per_cpu_ptr((part)->dkstats, i)->field; \
262 static inline void part_stat_set_all(struct hd_struct
*part
, int value
)
266 for_each_possible_cpu(i
)
267 memset(per_cpu_ptr(part
->dkstats
, i
), value
,
268 sizeof(struct disk_stats
));
271 static inline int init_part_stats(struct hd_struct
*part
)
273 part
->dkstats
= alloc_percpu(struct disk_stats
);
279 static inline void free_part_stats(struct hd_struct
*part
)
281 free_percpu(part
->dkstats
);
284 #else /* !CONFIG_SMP */
285 #define part_stat_lock() ({ rcu_read_lock(); 0; })
286 #define part_stat_unlock() rcu_read_unlock()
288 #define __part_stat_add(cpu, part, field, addnd) \
289 ((part)->dkstats.field += addnd)
291 #define part_stat_read(part, field) ((part)->dkstats.field)
293 static inline void part_stat_set_all(struct hd_struct
*part
, int value
)
295 memset(&part
->dkstats
, value
, sizeof(struct disk_stats
));
298 static inline int init_part_stats(struct hd_struct
*part
)
303 static inline void free_part_stats(struct hd_struct
*part
)
307 #endif /* CONFIG_SMP */
309 #define part_stat_add(cpu, part, field, addnd) do { \
310 __part_stat_add((cpu), (part), field, addnd); \
311 if ((part)->partno) \
312 __part_stat_add((cpu), &part_to_disk((part))->part0, \
316 #define part_stat_dec(cpu, gendiskp, field) \
317 part_stat_add(cpu, gendiskp, field, -1)
318 #define part_stat_inc(cpu, gendiskp, field) \
319 part_stat_add(cpu, gendiskp, field, 1)
320 #define part_stat_sub(cpu, gendiskp, field, subnd) \
321 part_stat_add(cpu, gendiskp, field, -subnd)
323 static inline void part_inc_in_flight(struct hd_struct
*part
)
327 part_to_disk(part
)->part0
.in_flight
++;
330 static inline void part_dec_in_flight(struct hd_struct
*part
)
334 part_to_disk(part
)->part0
.in_flight
--;
337 /* drivers/block/ll_rw_blk.c */
338 extern void part_round_stats(int cpu
, struct hd_struct
*part
);
340 /* drivers/block/genhd.c */
341 extern int get_blkdev_list(char *, int);
342 extern void add_disk(struct gendisk
*disk
);
343 extern void del_gendisk(struct gendisk
*gp
);
344 extern void unlink_gendisk(struct gendisk
*gp
);
345 extern struct gendisk
*get_gendisk(dev_t dev
, int *partno
);
346 extern struct block_device
*bdget_disk(struct gendisk
*disk
, int partno
);
348 extern void set_device_ro(struct block_device
*bdev
, int flag
);
349 extern void set_disk_ro(struct gendisk
*disk
, int flag
);
351 static inline int get_disk_ro(struct gendisk
*disk
)
353 return disk
->part0
.policy
;
356 /* drivers/char/random.c */
357 extern void add_disk_randomness(struct gendisk
*disk
);
358 extern void rand_initialize_disk(struct gendisk
*disk
);
360 static inline sector_t
get_start_sect(struct block_device
*bdev
)
362 return bdev
->bd_part
->start_sect
;
364 static inline sector_t
get_capacity(struct gendisk
*disk
)
366 return disk
->part0
.nr_sects
;
368 static inline void set_capacity(struct gendisk
*disk
, sector_t size
)
370 disk
->part0
.nr_sects
= size
;
373 #ifdef CONFIG_SOLARIS_X86_PARTITION
375 #define SOLARIS_X86_NUMSLICE 16
376 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
378 struct solaris_x86_slice
{
379 __le16 s_tag
; /* ID tag of partition */
380 __le16 s_flag
; /* permission flags */
381 __le32 s_start
; /* start sector no of partition */
382 __le32 s_size
; /* # of blocks in partition */
385 struct solaris_x86_vtoc
{
386 unsigned int v_bootinfo
[3]; /* info needed by mboot (unsupported) */
387 __le32 v_sanity
; /* to verify vtoc sanity */
388 __le32 v_version
; /* layout version */
389 char v_volume
[8]; /* volume name */
390 __le16 v_sectorsz
; /* sector size in bytes */
391 __le16 v_nparts
; /* number of partitions */
392 unsigned int v_reserved
[10]; /* free space */
393 struct solaris_x86_slice
394 v_slice
[SOLARIS_X86_NUMSLICE
]; /* slice headers */
395 unsigned int timestamp
[SOLARIS_X86_NUMSLICE
]; /* timestamp (unsupported) */
396 char v_asciilabel
[128]; /* for compatibility */
399 #endif /* CONFIG_SOLARIS_X86_PARTITION */
401 #ifdef CONFIG_BSD_DISKLABEL
403 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
404 * updated by Marc Espie <Marc.Espie@openbsd.org>
407 /* check against BSD src/sys/sys/disklabel.h for consistency */
409 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
410 #define BSD_MAXPARTITIONS 16
411 #define OPENBSD_MAXPARTITIONS 16
412 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
413 struct bsd_disklabel
{
414 __le32 d_magic
; /* the magic number */
415 __s16 d_type
; /* drive type */
416 __s16 d_subtype
; /* controller/d_type specific */
417 char d_typename
[16]; /* type name, e.g. "eagle" */
418 char d_packname
[16]; /* pack identifier */
419 __u32 d_secsize
; /* # of bytes per sector */
420 __u32 d_nsectors
; /* # of data sectors per track */
421 __u32 d_ntracks
; /* # of tracks per cylinder */
422 __u32 d_ncylinders
; /* # of data cylinders per unit */
423 __u32 d_secpercyl
; /* # of data sectors per cylinder */
424 __u32 d_secperunit
; /* # of data sectors per unit */
425 __u16 d_sparespertrack
; /* # of spare sectors per track */
426 __u16 d_sparespercyl
; /* # of spare sectors per cylinder */
427 __u32 d_acylinders
; /* # of alt. cylinders per unit */
428 __u16 d_rpm
; /* rotational speed */
429 __u16 d_interleave
; /* hardware sector interleave */
430 __u16 d_trackskew
; /* sector 0 skew, per track */
431 __u16 d_cylskew
; /* sector 0 skew, per cylinder */
432 __u32 d_headswitch
; /* head switch time, usec */
433 __u32 d_trkseek
; /* track-to-track seek, usec */
434 __u32 d_flags
; /* generic flags */
436 __u32 d_drivedata
[NDDATA
]; /* drive-type specific information */
438 __u32 d_spare
[NSPARE
]; /* reserved for future use */
439 __le32 d_magic2
; /* the magic number (again) */
440 __le16 d_checksum
; /* xor of data incl. partitions */
442 /* filesystem and partition information: */
443 __le16 d_npartitions
; /* number of partitions in following */
444 __le32 d_bbsize
; /* size of boot area at sn0, bytes */
445 __le32 d_sbsize
; /* max size of fs superblock, bytes */
446 struct bsd_partition
{ /* the partition table */
447 __le32 p_size
; /* number of sectors in partition */
448 __le32 p_offset
; /* starting sector */
449 __le32 p_fsize
; /* filesystem basic fragment size */
450 __u8 p_fstype
; /* filesystem type, see below */
451 __u8 p_frag
; /* filesystem fragments per block */
452 __le16 p_cpg
; /* filesystem cylinders per group */
453 } d_partitions
[BSD_MAXPARTITIONS
]; /* actually may be more */
456 #endif /* CONFIG_BSD_DISKLABEL */
458 #ifdef CONFIG_UNIXWARE_DISKLABEL
460 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
461 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
464 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
465 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
466 #define UNIXWARE_NUMSLICE 16
467 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
469 struct unixware_slice
{
470 __le16 s_label
; /* label */
471 __le16 s_flags
; /* permission flags */
472 __le32 start_sect
; /* starting sector */
473 __le32 nr_sects
; /* number of sectors in slice */
476 struct unixware_disklabel
{
477 __le32 d_type
; /* drive type */
478 __le32 d_magic
; /* the magic number */
479 __le32 d_version
; /* version number */
480 char d_serial
[12]; /* serial number of the device */
481 __le32 d_ncylinders
; /* # of data cylinders per device */
482 __le32 d_ntracks
; /* # of tracks per cylinder */
483 __le32 d_nsectors
; /* # of data sectors per track */
484 __le32 d_secsize
; /* # of bytes per sector */
485 __le32 d_part_start
; /* # of first sector of this partition */
486 __le32 d_unknown1
[12]; /* ? */
487 __le32 d_alt_tbl
; /* byte offset of alternate table */
488 __le32 d_alt_len
; /* byte length of alternate table */
489 __le32 d_phys_cyl
; /* # of physical cylinders per device */
490 __le32 d_phys_trk
; /* # of physical tracks per cylinder */
491 __le32 d_phys_sec
; /* # of physical sectors per track */
492 __le32 d_phys_bytes
; /* # of physical bytes per sector */
493 __le32 d_unknown2
; /* ? */
494 __le32 d_unknown3
; /* ? */
495 __le32 d_pad
[8]; /* pad */
497 struct unixware_vtoc
{
498 __le32 v_magic
; /* the magic number */
499 __le32 v_version
; /* version number */
500 char v_name
[8]; /* volume name */
501 __le16 v_nslices
; /* # of slices */
502 __le16 v_unknown1
; /* ? */
503 __le32 v_reserved
[10]; /* reserved */
504 struct unixware_slice
505 v_slice
[UNIXWARE_NUMSLICE
]; /* slice headers */
510 #endif /* CONFIG_UNIXWARE_DISKLABEL */
512 #ifdef CONFIG_MINIX_SUBPARTITION
513 # define MINIX_NR_SUBPARTITIONS 4
514 #endif /* CONFIG_MINIX_SUBPARTITION */
516 #define ADDPART_FLAG_NONE 0
517 #define ADDPART_FLAG_RAID 1
518 #define ADDPART_FLAG_WHOLEDISK 2
520 extern int blk_alloc_devt(struct hd_struct
*part
, dev_t
*devt
);
521 extern void blk_free_devt(dev_t devt
);
522 extern dev_t
blk_lookup_devt(const char *name
, int partno
);
523 extern char *disk_name (struct gendisk
*hd
, int partno
, char *buf
);
525 extern int disk_expand_part_tbl(struct gendisk
*disk
, int target
);
526 extern int rescan_partitions(struct gendisk
*disk
, struct block_device
*bdev
);
527 extern int __must_check
add_partition(struct gendisk
*, int, sector_t
, sector_t
, int);
528 extern void delete_partition(struct gendisk
*, int);
529 extern void printk_all_partitions(void);
531 extern struct gendisk
*alloc_disk_node(int minors
, int node_id
);
532 extern struct gendisk
*alloc_disk(int minors
);
533 extern struct kobject
*get_disk(struct gendisk
*disk
);
534 extern void put_disk(struct gendisk
*disk
);
535 extern void blk_register_region(dev_t devt
, unsigned long range
,
536 struct module
*module
,
537 struct kobject
*(*probe
)(dev_t
, int *, void *),
538 int (*lock
)(dev_t
, void *),
540 extern void blk_unregister_region(dev_t devt
, unsigned long range
);
542 extern ssize_t
part_size_show(struct device
*dev
,
543 struct device_attribute
*attr
, char *buf
);
544 extern ssize_t
part_stat_show(struct device
*dev
,
545 struct device_attribute
*attr
, char *buf
);
546 #ifdef CONFIG_FAIL_MAKE_REQUEST
547 extern ssize_t
part_fail_show(struct device
*dev
,
548 struct device_attribute
*attr
, char *buf
);
549 extern ssize_t
part_fail_store(struct device
*dev
,
550 struct device_attribute
*attr
,
551 const char *buf
, size_t count
);
552 #endif /* CONFIG_FAIL_MAKE_REQUEST */
554 #else /* CONFIG_BLOCK */
556 static inline void printk_all_partitions(void) { }
558 static inline dev_t
blk_lookup_devt(const char *name
, int partno
)
560 dev_t devt
= MKDEV(0, 0);
564 #endif /* CONFIG_BLOCK */
566 #endif /* _LINUX_GENHD_H */