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