diff options
Diffstat (limited to 'include/linux/genhd.h')
| -rw-r--r-- | include/linux/genhd.h | 424 |
1 files changed, 424 insertions, 0 deletions
diff --git a/include/linux/genhd.h b/include/linux/genhd.h new file mode 100644 index 000000000000..47dedaf971d6 --- /dev/null +++ b/include/linux/genhd.h @@ -0,0 +1,424 @@ +#ifndef _LINUX_GENHD_H +#define _LINUX_GENHD_H + +/* + * genhd.h Copyright (C) 1992 Drew Eckhardt + * Generic hard disk header file by + * Drew Eckhardt + * + * <drew@colorado.edu> + */ + +#include <linux/config.h> +#include <linux/types.h> +#include <linux/major.h> +#include <linux/device.h> +#include <linux/smp.h> +#include <linux/string.h> +#include <linux/fs.h> + +enum { +/* These three have identical behaviour; use the second one if DOS FDISK gets + confused about extended/logical partitions starting past cylinder 1023. */ + DOS_EXTENDED_PARTITION = 5, + LINUX_EXTENDED_PARTITION = 0x85, + WIN98_EXTENDED_PARTITION = 0x0f, + + LINUX_SWAP_PARTITION = 0x82, + LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */ + + SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION, + NEW_SOLARIS_X86_PARTITION = 0xbf, + + DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */ + DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */ + DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */ + EZD_PARTITION = 0x55, /* EZ-DRIVE */ + + FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */ + OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */ + NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */ + BSDI_PARTITION = 0xb7, /* BSDI Partition ID */ + MINIX_PARTITION = 0x81, /* Minix Partition ID */ + UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */ +}; + +#ifndef __KERNEL__ + +struct partition { + unsigned char boot_ind; /* 0x80 - active */ + unsigned char head; /* starting head */ + unsigned char sector; /* starting sector */ + unsigned char cyl; /* starting cylinder */ + unsigned char sys_ind; /* What partition type */ + unsigned char end_head; /* end head */ + unsigned char end_sector; /* end sector */ + unsigned char end_cyl; /* end cylinder */ + unsigned int start_sect; /* starting sector counting from 0 */ + unsigned int nr_sects; /* nr of sectors in partition */ +} __attribute__((packed)); + +#endif + +#ifdef __KERNEL__ +struct partition { + unsigned char boot_ind; /* 0x80 - active */ + unsigned char head; /* starting head */ + unsigned char sector; /* starting sector */ + unsigned char cyl; /* starting cylinder */ + unsigned char sys_ind; /* What partition type */ + unsigned char end_head; /* end head */ + unsigned char end_sector; /* end sector */ + unsigned char end_cyl; /* end cylinder */ + __le32 start_sect; /* starting sector counting from 0 */ + __le32 nr_sects; /* nr of sectors in partition */ +} __attribute__((packed)); + +struct hd_struct { + sector_t start_sect; + sector_t nr_sects; + struct kobject kobj; + unsigned reads, read_sectors, writes, write_sectors; + int policy, partno; +}; + +#define GENHD_FL_REMOVABLE 1 +#define GENHD_FL_DRIVERFS 2 +#define GENHD_FL_CD 8 +#define GENHD_FL_UP 16 +#define GENHD_FL_SUPPRESS_PARTITION_INFO 32 + +struct disk_stats { + unsigned read_sectors, write_sectors; + unsigned reads, writes; + unsigned read_merges, write_merges; + unsigned read_ticks, write_ticks; + unsigned io_ticks; + unsigned time_in_queue; +}; + +struct gendisk { + int major; /* major number of driver */ + int first_minor; + int minors; /* maximum number of minors, =1 for + * disks that can't be partitioned. */ + char disk_name[32]; /* name of major driver */ + struct hd_struct **part; /* [indexed by minor] */ + struct block_device_operations *fops; + struct request_queue *queue; + void *private_data; + sector_t capacity; + + int flags; + char devfs_name[64]; /* devfs crap */ + int number; /* more of the same */ + struct device *driverfs_dev; + struct kobject kobj; + + struct timer_rand_state *random; + int policy; + + atomic_t sync_io; /* RAID */ + unsigned long stamp, stamp_idle; + int in_flight; +#ifdef CONFIG_SMP + struct disk_stats *dkstats; +#else + struct disk_stats dkstats; +#endif +}; + +/* Structure for sysfs attributes on block devices */ +struct disk_attribute { + struct attribute attr; + ssize_t (*show)(struct gendisk *, char *); +}; + +/* + * Macros to operate on percpu disk statistics: + * + * The __ variants should only be called in critical sections. The full + * variants disable/enable preemption. + */ +#ifdef CONFIG_SMP +#define __disk_stat_add(gendiskp, field, addnd) \ + (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd) + +#define disk_stat_read(gendiskp, field) \ +({ \ + typeof(gendiskp->dkstats->field) res = 0; \ + int i; \ + for (i=0; i < NR_CPUS; i++) { \ + if (!cpu_possible(i)) \ + continue; \ + res += per_cpu_ptr(gendiskp->dkstats, i)->field; \ + } \ + res; \ +}) + +static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) { + int i; + for (i=0; i < NR_CPUS; i++) { + if (cpu_possible(i)) { + memset(per_cpu_ptr(gendiskp->dkstats, i), value, + sizeof (struct disk_stats)); + } + } +} + +#else +#define __disk_stat_add(gendiskp, field, addnd) \ + (gendiskp->dkstats.field += addnd) +#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field) + +static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) { + memset(&gendiskp->dkstats, value, sizeof (struct disk_stats)); +} +#endif + +#define disk_stat_add(gendiskp, field, addnd) \ + do { \ + preempt_disable(); \ + __disk_stat_add(gendiskp, field, addnd); \ + preempt_enable(); \ + } while (0) + +#define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1) +#define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1) + +#define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1) +#define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1) + +#define __disk_stat_sub(gendiskp, field, subnd) \ + __disk_stat_add(gendiskp, field, -subnd) +#define disk_stat_sub(gendiskp, field, subnd) \ + disk_stat_add(gendiskp, field, -subnd) + + +/* Inlines to alloc and free disk stats in struct gendisk */ +#ifdef CONFIG_SMP +static inline int init_disk_stats(struct gendisk *disk) +{ + disk->dkstats = alloc_percpu(struct disk_stats); + if (!disk->dkstats) + return 0; + return 1; +} + +static inline void free_disk_stats(struct gendisk *disk) +{ + free_percpu(disk->dkstats); +} +#else /* CONFIG_SMP */ +static inline int init_disk_stats(struct gendisk *disk) +{ + return 1; +} + +static inline void free_disk_stats(struct gendisk *disk) +{ +} +#endif /* CONFIG_SMP */ + +/* drivers/block/ll_rw_blk.c */ +extern void disk_round_stats(struct gendisk *disk); + +/* drivers/block/genhd.c */ +extern int get_blkdev_list(char *); +extern void add_disk(struct gendisk *disk); +extern void del_gendisk(struct gendisk *gp); +extern void unlink_gendisk(struct gendisk *gp); +extern struct gendisk *get_gendisk(dev_t dev, int *part); + +extern void set_device_ro(struct block_device *bdev, int flag); +extern void set_disk_ro(struct gendisk *disk, int flag); + +/* drivers/char/random.c */ +extern void add_disk_randomness(struct gendisk *disk); +extern void rand_initialize_disk(struct gendisk *disk); + +static inline sector_t get_start_sect(struct block_device *bdev) +{ + return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect; +} +static inline sector_t get_capacity(struct gendisk *disk) +{ + return disk->capacity; +} +static inline void set_capacity(struct gendisk *disk, sector_t size) +{ + disk->capacity = size; +} + +#endif /* __KERNEL__ */ + +#ifdef CONFIG_SOLARIS_X86_PARTITION + +#define SOLARIS_X86_NUMSLICE 8 +#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL) + +struct solaris_x86_slice { + __le16 s_tag; /* ID tag of partition */ + __le16 s_flag; /* permission flags */ + __le32 s_start; /* start sector no of partition */ + __le32 s_size; /* # of blocks in partition */ +}; + +struct solaris_x86_vtoc { + unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */ + __le32 v_sanity; /* to verify vtoc sanity */ + __le32 v_version; /* layout version */ + char v_volume[8]; /* volume name */ + __le16 v_sectorsz; /* sector size in bytes */ + __le16 v_nparts; /* number of partitions */ + unsigned int v_reserved[10]; /* free space */ + struct solaris_x86_slice + v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */ + unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */ + char v_asciilabel[128]; /* for compatibility */ +}; + +#endif /* CONFIG_SOLARIS_X86_PARTITION */ + +#ifdef CONFIG_BSD_DISKLABEL +/* + * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il> + * updated by Marc Espie <Marc.Espie@openbsd.org> + */ + +/* check against BSD src/sys/sys/disklabel.h for consistency */ + +#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */ +#define BSD_MAXPARTITIONS 16 +#define OPENBSD_MAXPARTITIONS 16 +#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */ +struct bsd_disklabel { + __le32 d_magic; /* the magic number */ + __s16 d_type; /* drive type */ + __s16 d_subtype; /* controller/d_type specific */ + char d_typename[16]; /* type name, e.g. "eagle" */ + char d_packname[16]; /* pack identifier */ + __u32 d_secsize; /* # of bytes per sector */ + __u32 d_nsectors; /* # of data sectors per track */ + __u32 d_ntracks; /* # of tracks per cylinder */ + __u32 d_ncylinders; /* # of data cylinders per unit */ + __u32 d_secpercyl; /* # of data sectors per cylinder */ + __u32 d_secperunit; /* # of data sectors per unit */ + __u16 d_sparespertrack; /* # of spare sectors per track */ + __u16 d_sparespercyl; /* # of spare sectors per cylinder */ + __u32 d_acylinders; /* # of alt. cylinders per unit */ + __u16 d_rpm; /* rotational speed */ + __u16 d_interleave; /* hardware sector interleave */ + __u16 d_trackskew; /* sector 0 skew, per track */ + __u16 d_cylskew; /* sector 0 skew, per cylinder */ + __u32 d_headswitch; /* head switch time, usec */ + __u32 d_trkseek; /* track-to-track seek, usec */ + __u32 d_flags; /* generic flags */ +#define NDDATA 5 + __u32 d_drivedata[NDDATA]; /* drive-type specific information */ +#define NSPARE 5 + __u32 d_spare[NSPARE]; /* reserved for future use */ + __le32 d_magic2; /* the magic number (again) */ + __le16 d_checksum; /* xor of data incl. partitions */ + + /* filesystem and partition information: */ + __le16 d_npartitions; /* number of partitions in following */ + __le32 d_bbsize; /* size of boot area at sn0, bytes */ + __le32 d_sbsize; /* max size of fs superblock, bytes */ + struct bsd_partition { /* the partition table */ + __le32 p_size; /* number of sectors in partition */ + __le32 p_offset; /* starting sector */ + __le32 p_fsize; /* filesystem basic fragment size */ + __u8 p_fstype; /* filesystem type, see below */ + __u8 p_frag; /* filesystem fragments per block */ + __le16 p_cpg; /* filesystem cylinders per group */ + } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */ +}; + +#endif /* CONFIG_BSD_DISKLABEL */ + +#ifdef CONFIG_UNIXWARE_DISKLABEL +/* + * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl> + * and Krzysztof G. Baranowski <kgb@knm.org.pl> + */ + +#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */ +#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */ +#define UNIXWARE_NUMSLICE 16 +#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */ + +struct unixware_slice { + __le16 s_label; /* label */ + __le16 s_flags; /* permission flags */ + __le32 start_sect; /* starting sector */ + __le32 nr_sects; /* number of sectors in slice */ +}; + +struct unixware_disklabel { + __le32 d_type; /* drive type */ + __le32 d_magic; /* the magic number */ + __le32 d_version; /* version number */ + char d_serial[12]; /* serial number of the device */ + __le32 d_ncylinders; /* # of data cylinders per device */ + __le32 d_ntracks; /* # of tracks per cylinder */ + __le32 d_nsectors; /* # of data sectors per track */ + __le32 d_secsize; /* # of bytes per sector */ + __le32 d_part_start; /* # of first sector of this partition */ + __le32 d_unknown1[12]; /* ? */ + __le32 d_alt_tbl; /* byte offset of alternate table */ + __le32 d_alt_len; /* byte length of alternate table */ + __le32 d_phys_cyl; /* # of physical cylinders per device */ + __le32 d_phys_trk; /* # of physical tracks per cylinder */ + __le32 d_phys_sec; /* # of physical sectors per track */ + __le32 d_phys_bytes; /* # of physical bytes per sector */ + __le32 d_unknown2; /* ? */ + __le32 d_unknown3; /* ? */ + __le32 d_pad[8]; /* pad */ + + struct unixware_vtoc { + __le32 v_magic; /* the magic number */ + __le32 v_version; /* version number */ + char v_name[8]; /* volume name */ + __le16 v_nslices; /* # of slices */ + __le16 v_unknown1; /* ? */ + __le32 v_reserved[10]; /* reserved */ + struct unixware_slice + v_slice[UNIXWARE_NUMSLICE]; /* slice headers */ + } vtoc; + +}; /* 408 */ + +#endif /* CONFIG_UNIXWARE_DISKLABEL */ + +#ifdef CONFIG_MINIX_SUBPARTITION +# define MINIX_NR_SUBPARTITIONS 4 +#endif /* CONFIG_MINIX_SUBPARTITION */ + +#ifdef __KERNEL__ + +char *disk_name (struct gendisk *hd, int part, char *buf); + +extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev); +extern void add_partition(struct gendisk *, int, sector_t, sector_t); +extern void delete_partition(struct gendisk *, int); + +extern struct gendisk *alloc_disk(int minors); +extern struct kobject *get_disk(struct gendisk *disk); +extern void put_disk(struct gendisk *disk); + +extern void blk_register_region(dev_t dev, unsigned long range, + struct module *module, + struct kobject *(*probe)(dev_t, int *, void *), + int (*lock)(dev_t, void *), + void *data); +extern void blk_unregister_region(dev_t dev, unsigned long range); + +static inline struct block_device *bdget_disk(struct gendisk *disk, int index) +{ + return bdget(MKDEV(disk->major, disk->first_minor) + index); +} + +#endif + +#endif |