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, dev)
20 #define dev_to_part(device) container_of(device, struct hd_struct, dev)
22 extern struct device_type part_type;
23 extern struct kobject *block_depr;
24 extern struct class block_class;
26 extern const struct seq_operations partitions_op;
27 extern const struct seq_operations diskstats_op;
30 /* These three have identical behaviour; use the second one if DOS FDISK gets
31 confused about extended/logical partitions starting past cylinder 1023. */
32 DOS_EXTENDED_PARTITION = 5,
33 LINUX_EXTENDED_PARTITION = 0x85,
34 WIN98_EXTENDED_PARTITION = 0x0f,
36 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
38 LINUX_SWAP_PARTITION = 0x82,
39 LINUX_DATA_PARTITION = 0x83,
40 LINUX_LVM_PARTITION = 0x8e,
41 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
43 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
44 NEW_SOLARIS_X86_PARTITION = 0xbf,
46 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
47 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
48 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
49 EZD_PARTITION = 0x55, /* EZ-DRIVE */
51 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
52 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
53 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
54 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
55 MINIX_PARTITION = 0x81, /* Minix Partition ID */
56 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
59 #include <linux/major.h>
60 #include <linux/device.h>
61 #include <linux/smp.h>
62 #include <linux/string.h>
64 #include <linux/workqueue.h>
67 unsigned char boot_ind; /* 0x80 - active */
68 unsigned char head; /* starting head */
69 unsigned char sector; /* starting sector */
70 unsigned char cyl; /* starting cylinder */
71 unsigned char sys_ind; /* What partition type */
72 unsigned char end_head; /* end head */
73 unsigned char end_sector; /* end sector */
74 unsigned char end_cyl; /* end cylinder */
75 __le32 start_sect; /* starting sector counting from 0 */
76 __le32 nr_sects; /* nr of sectors in partition */
77 } __attribute__((packed));
80 unsigned long sectors[2]; /* READs and WRITEs */
82 unsigned long merges[2];
83 unsigned long ticks[2];
84 unsigned long io_ticks;
85 unsigned long time_in_queue;
92 struct kobject *holder_dir;
94 #ifdef CONFIG_FAIL_MAKE_REQUEST
100 struct disk_stats *dkstats;
102 struct disk_stats dkstats;
104 struct rcu_head rcu_head;
107 #define GENHD_FL_REMOVABLE 1
108 #define GENHD_FL_DRIVERFS 2
109 #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
110 #define GENHD_FL_CD 8
111 #define GENHD_FL_UP 16
112 #define GENHD_FL_SUPPRESS_PARTITION_INFO 32
113 #define GENHD_FL_FAIL 64
116 /* major, first_minor and minors are input parameters only,
117 * don't use directly. Use disk_devt() and disk_max_parts().
119 int major; /* major number of driver */
121 int minors; /* maximum number of minors, =1 for
122 * disks that can't be partitioned. */
124 char disk_name[32]; /* name of major driver */
126 /* Array of pointers to partitions indexed by partno - 1.
127 * Protected with matching bdev lock but stat and other
128 * non-critical accesses use RCU. Always access through
131 struct hd_struct **__part;
133 struct block_device_operations *fops;
134 struct request_queue *queue;
139 struct device *driverfs_dev; // FIXME: remove
141 struct kobject *holder_dir;
142 struct kobject *slave_dir;
144 struct timer_rand_state *random;
147 atomic_t sync_io; /* RAID */
151 struct disk_stats *dkstats;
153 struct disk_stats dkstats;
155 struct work_struct async_notify;
156 #ifdef CONFIG_BLK_DEV_INTEGRITY
157 struct blk_integrity *integrity;
161 static inline struct gendisk *part_to_disk(struct hd_struct *part)
164 return dev_to_disk((part)->dev.parent);
168 static inline int disk_max_parts(struct gendisk *disk)
170 return disk->minors - 1;
173 static inline dev_t disk_devt(struct gendisk *disk)
175 return disk->dev.devt;
178 static inline dev_t part_devt(struct hd_struct *part)
180 return part->dev.devt;
183 extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
185 static inline void disk_put_part(struct hd_struct *part)
188 put_device(&part->dev);
192 * Smarter partition iterator without context limits.
194 #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
195 #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
197 struct disk_part_iter {
198 struct gendisk *disk;
199 struct hd_struct *part;
204 extern void disk_part_iter_init(struct disk_part_iter *piter,
205 struct gendisk *disk, unsigned int flags);
206 extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
207 extern void disk_part_iter_exit(struct disk_part_iter *piter);
209 extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
213 * Macros to operate on percpu disk statistics:
215 * The __ variants should only be called in critical sections. The full
216 * variants disable/enable preemption.
220 #define __disk_stat_add(gendiskp, field, addnd) \
221 (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
223 #define disk_stat_read(gendiskp, field) \
225 typeof(gendiskp->dkstats->field) res = 0; \
227 for_each_possible_cpu(i) \
228 res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
232 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
235 for_each_possible_cpu(i)
236 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
237 sizeof(struct disk_stats));
240 #define __part_stat_add(part, field, addnd) \
241 (per_cpu_ptr(part->dkstats, smp_processor_id())->field += addnd)
243 #define __all_stat_add(gendiskp, part, field, addnd, sector) \
246 __part_stat_add(part, field, addnd); \
247 __disk_stat_add(gendiskp, field, addnd); \
250 #define part_stat_read(part, field) \
252 typeof(part->dkstats->field) res = 0; \
254 for_each_possible_cpu(i) \
255 res += per_cpu_ptr(part->dkstats, i)->field; \
259 static inline void part_stat_set_all(struct hd_struct *part, int value)
263 for_each_possible_cpu(i)
264 memset(per_cpu_ptr(part->dkstats, i), value,
265 sizeof(struct disk_stats));
268 #else /* !CONFIG_SMP */
269 #define __disk_stat_add(gendiskp, field, addnd) \
270 (gendiskp->dkstats.field += addnd)
271 #define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
273 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
275 memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
278 #define __part_stat_add(part, field, addnd) \
279 (part->dkstats.field += addnd)
281 #define __all_stat_add(gendiskp, part, field, addnd, sector) \
284 part->dkstats.field += addnd; \
285 __disk_stat_add(gendiskp, field, addnd); \
288 #define part_stat_read(part, field) (part->dkstats.field)
290 static inline void part_stat_set_all(struct hd_struct *part, int value)
292 memset(&part->dkstats, value, sizeof(struct disk_stats));
295 #endif /* CONFIG_SMP */
297 #define disk_stat_add(gendiskp, field, addnd) \
300 __disk_stat_add(gendiskp, field, addnd); \
304 #define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
305 #define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
307 #define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
308 #define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
310 #define __disk_stat_sub(gendiskp, field, subnd) \
311 __disk_stat_add(gendiskp, field, -subnd)
312 #define disk_stat_sub(gendiskp, field, subnd) \
313 disk_stat_add(gendiskp, field, -subnd)
315 #define part_stat_add(gendiskp, field, addnd) \
318 __part_stat_add(gendiskp, field, addnd);\
322 #define __part_stat_dec(gendiskp, field) __part_stat_add(gendiskp, field, -1)
323 #define part_stat_dec(gendiskp, field) part_stat_add(gendiskp, field, -1)
325 #define __part_stat_inc(gendiskp, field) __part_stat_add(gendiskp, field, 1)
326 #define part_stat_inc(gendiskp, field) part_stat_add(gendiskp, field, 1)
328 #define __part_stat_sub(gendiskp, field, subnd) \
329 __part_stat_add(gendiskp, field, -subnd)
330 #define part_stat_sub(gendiskp, field, subnd) \
331 part_stat_add(gendiskp, field, -subnd)
333 #define all_stat_add(gendiskp, part, field, addnd, sector) \
336 __all_stat_add(gendiskp, part, field, addnd, sector); \
340 #define __all_stat_dec(gendiskp, field, sector) \
341 __all_stat_add(gendiskp, field, -1, sector)
342 #define all_stat_dec(gendiskp, field, sector) \
343 all_stat_add(gendiskp, field, -1, sector)
345 #define __all_stat_inc(gendiskp, part, field, sector) \
346 __all_stat_add(gendiskp, part, field, 1, sector)
347 #define all_stat_inc(gendiskp, part, field, sector) \
348 all_stat_add(gendiskp, part, field, 1, sector)
350 #define __all_stat_sub(gendiskp, part, field, subnd, sector) \
351 __all_stat_add(gendiskp, part, field, -subnd, sector)
352 #define all_stat_sub(gendiskp, part, field, subnd, sector) \
353 all_stat_add(gendiskp, part, field, -subnd, sector)
355 /* Inlines to alloc and free disk stats in struct gendisk */
357 static inline int init_disk_stats(struct gendisk *disk)
359 disk->dkstats = alloc_percpu(struct disk_stats);
365 static inline void free_disk_stats(struct gendisk *disk)
367 free_percpu(disk->dkstats);
370 static inline int init_part_stats(struct hd_struct *part)
372 part->dkstats = alloc_percpu(struct disk_stats);
378 static inline void free_part_stats(struct hd_struct *part)
380 free_percpu(part->dkstats);
383 #else /* CONFIG_SMP */
384 static inline int init_disk_stats(struct gendisk *disk)
389 static inline void free_disk_stats(struct gendisk *disk)
393 static inline int init_part_stats(struct hd_struct *part)
398 static inline void free_part_stats(struct hd_struct *part)
401 #endif /* CONFIG_SMP */
403 /* drivers/block/ll_rw_blk.c */
404 extern void disk_round_stats(struct gendisk *disk);
405 extern void part_round_stats(struct hd_struct *part);
407 /* drivers/block/genhd.c */
408 extern int get_blkdev_list(char *, int);
409 extern void add_disk(struct gendisk *disk);
410 extern void del_gendisk(struct gendisk *gp);
411 extern void unlink_gendisk(struct gendisk *gp);
412 extern struct gendisk *get_gendisk(dev_t dev, int *partno);
413 extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
415 extern void set_device_ro(struct block_device *bdev, int flag);
416 extern void set_disk_ro(struct gendisk *disk, int flag);
418 /* drivers/char/random.c */
419 extern void add_disk_randomness(struct gendisk *disk);
420 extern void rand_initialize_disk(struct gendisk *disk);
422 static inline sector_t get_start_sect(struct block_device *bdev)
424 return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
426 static inline sector_t get_capacity(struct gendisk *disk)
428 return disk->capacity;
430 static inline void set_capacity(struct gendisk *disk, sector_t size)
432 disk->capacity = size;
435 #ifdef CONFIG_SOLARIS_X86_PARTITION
437 #define SOLARIS_X86_NUMSLICE 16
438 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
440 struct solaris_x86_slice {
441 __le16 s_tag; /* ID tag of partition */
442 __le16 s_flag; /* permission flags */
443 __le32 s_start; /* start sector no of partition */
444 __le32 s_size; /* # of blocks in partition */
447 struct solaris_x86_vtoc {
448 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
449 __le32 v_sanity; /* to verify vtoc sanity */
450 __le32 v_version; /* layout version */
451 char v_volume[8]; /* volume name */
452 __le16 v_sectorsz; /* sector size in bytes */
453 __le16 v_nparts; /* number of partitions */
454 unsigned int v_reserved[10]; /* free space */
455 struct solaris_x86_slice
456 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
457 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
458 char v_asciilabel[128]; /* for compatibility */
461 #endif /* CONFIG_SOLARIS_X86_PARTITION */
463 #ifdef CONFIG_BSD_DISKLABEL
465 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
466 * updated by Marc Espie <Marc.Espie@openbsd.org>
469 /* check against BSD src/sys/sys/disklabel.h for consistency */
471 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
472 #define BSD_MAXPARTITIONS 16
473 #define OPENBSD_MAXPARTITIONS 16
474 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
475 struct bsd_disklabel {
476 __le32 d_magic; /* the magic number */
477 __s16 d_type; /* drive type */
478 __s16 d_subtype; /* controller/d_type specific */
479 char d_typename[16]; /* type name, e.g. "eagle" */
480 char d_packname[16]; /* pack identifier */
481 __u32 d_secsize; /* # of bytes per sector */
482 __u32 d_nsectors; /* # of data sectors per track */
483 __u32 d_ntracks; /* # of tracks per cylinder */
484 __u32 d_ncylinders; /* # of data cylinders per unit */
485 __u32 d_secpercyl; /* # of data sectors per cylinder */
486 __u32 d_secperunit; /* # of data sectors per unit */
487 __u16 d_sparespertrack; /* # of spare sectors per track */
488 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
489 __u32 d_acylinders; /* # of alt. cylinders per unit */
490 __u16 d_rpm; /* rotational speed */
491 __u16 d_interleave; /* hardware sector interleave */
492 __u16 d_trackskew; /* sector 0 skew, per track */
493 __u16 d_cylskew; /* sector 0 skew, per cylinder */
494 __u32 d_headswitch; /* head switch time, usec */
495 __u32 d_trkseek; /* track-to-track seek, usec */
496 __u32 d_flags; /* generic flags */
498 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
500 __u32 d_spare[NSPARE]; /* reserved for future use */
501 __le32 d_magic2; /* the magic number (again) */
502 __le16 d_checksum; /* xor of data incl. partitions */
504 /* filesystem and partition information: */
505 __le16 d_npartitions; /* number of partitions in following */
506 __le32 d_bbsize; /* size of boot area at sn0, bytes */
507 __le32 d_sbsize; /* max size of fs superblock, bytes */
508 struct bsd_partition { /* the partition table */
509 __le32 p_size; /* number of sectors in partition */
510 __le32 p_offset; /* starting sector */
511 __le32 p_fsize; /* filesystem basic fragment size */
512 __u8 p_fstype; /* filesystem type, see below */
513 __u8 p_frag; /* filesystem fragments per block */
514 __le16 p_cpg; /* filesystem cylinders per group */
515 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
518 #endif /* CONFIG_BSD_DISKLABEL */
520 #ifdef CONFIG_UNIXWARE_DISKLABEL
522 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
523 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
526 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
527 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
528 #define UNIXWARE_NUMSLICE 16
529 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
531 struct unixware_slice {
532 __le16 s_label; /* label */
533 __le16 s_flags; /* permission flags */
534 __le32 start_sect; /* starting sector */
535 __le32 nr_sects; /* number of sectors in slice */
538 struct unixware_disklabel {
539 __le32 d_type; /* drive type */
540 __le32 d_magic; /* the magic number */
541 __le32 d_version; /* version number */
542 char d_serial[12]; /* serial number of the device */
543 __le32 d_ncylinders; /* # of data cylinders per device */
544 __le32 d_ntracks; /* # of tracks per cylinder */
545 __le32 d_nsectors; /* # of data sectors per track */
546 __le32 d_secsize; /* # of bytes per sector */
547 __le32 d_part_start; /* # of first sector of this partition */
548 __le32 d_unknown1[12]; /* ? */
549 __le32 d_alt_tbl; /* byte offset of alternate table */
550 __le32 d_alt_len; /* byte length of alternate table */
551 __le32 d_phys_cyl; /* # of physical cylinders per device */
552 __le32 d_phys_trk; /* # of physical tracks per cylinder */
553 __le32 d_phys_sec; /* # of physical sectors per track */
554 __le32 d_phys_bytes; /* # of physical bytes per sector */
555 __le32 d_unknown2; /* ? */
556 __le32 d_unknown3; /* ? */
557 __le32 d_pad[8]; /* pad */
559 struct unixware_vtoc {
560 __le32 v_magic; /* the magic number */
561 __le32 v_version; /* version number */
562 char v_name[8]; /* volume name */
563 __le16 v_nslices; /* # of slices */
564 __le16 v_unknown1; /* ? */
565 __le32 v_reserved[10]; /* reserved */
566 struct unixware_slice
567 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
572 #endif /* CONFIG_UNIXWARE_DISKLABEL */
574 #ifdef CONFIG_MINIX_SUBPARTITION
575 # define MINIX_NR_SUBPARTITIONS 4
576 #endif /* CONFIG_MINIX_SUBPARTITION */
578 #define ADDPART_FLAG_NONE 0
579 #define ADDPART_FLAG_RAID 1
580 #define ADDPART_FLAG_WHOLEDISK 2
582 extern dev_t blk_lookup_devt(const char *name, int partno);
583 extern char *disk_name (struct gendisk *hd, int partno, char *buf);
585 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
586 extern int __must_check add_partition(struct gendisk *, int, sector_t, sector_t, int);
587 extern void delete_partition(struct gendisk *, int);
588 extern void printk_all_partitions(void);
590 extern struct gendisk *alloc_disk_node(int minors, int node_id);
591 extern struct gendisk *alloc_disk(int minors);
592 extern struct kobject *get_disk(struct gendisk *disk);
593 extern void put_disk(struct gendisk *disk);
594 extern void blk_register_region(dev_t devt, unsigned long range,
595 struct module *module,
596 struct kobject *(*probe)(dev_t, int *, void *),
597 int (*lock)(dev_t, void *),
599 extern void blk_unregister_region(dev_t devt, unsigned long range);
601 #else /* CONFIG_BLOCK */
603 static inline void printk_all_partitions(void) { }
605 static inline dev_t blk_lookup_devt(const char *name, int partno)
607 dev_t devt = MKDEV(0, 0);
611 #endif /* CONFIG_BLOCK */
613 #endif /* _LINUX_GENHD_H */