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| Rev | Author | Line No. | Line |
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| 422 | giacomo | 1 | #ifndef _LINUX_GENHD_H |
| 2 | #define _LINUX_GENHD_H |
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| 3 | |||
| 4 | /* |
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| 5 | * genhd.h Copyright (C) 1992 Drew Eckhardt |
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| 6 | * Generic hard disk header file by |
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| 7 | * Drew Eckhardt |
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| 8 | * |
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| 9 | * <drew@colorado.edu> |
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| 10 | */ |
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| 11 | |||
| 12 | #include <linux/config.h> |
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| 13 | #include <linux/types.h> |
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| 14 | #include <linux/major.h> |
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| 15 | #include <linux/device.h> |
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| 16 | #include <linux/smp.h> |
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| 17 | #include <linux/string.h> |
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| 18 | #include <linux/fs.h> |
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| 19 | |||
| 20 | enum { |
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| 21 | /* These three have identical behaviour; use the second one if DOS FDISK gets |
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| 22 | confused about extended/logical partitions starting past cylinder 1023. */ |
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| 23 | DOS_EXTENDED_PARTITION = 5, |
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| 24 | LINUX_EXTENDED_PARTITION = 0x85, |
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| 25 | WIN98_EXTENDED_PARTITION = 0x0f, |
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| 26 | |||
| 27 | LINUX_SWAP_PARTITION = 0x82, |
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| 28 | LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */ |
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| 29 | |||
| 30 | SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION, |
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| 31 | |||
| 32 | DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */ |
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| 33 | DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */ |
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| 34 | DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */ |
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| 35 | EZD_PARTITION = 0x55, /* EZ-DRIVE */ |
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| 36 | |||
| 37 | FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */ |
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| 38 | OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */ |
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| 39 | NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */ |
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| 40 | BSDI_PARTITION = 0xb7, /* BSDI Partition ID */ |
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| 41 | MINIX_PARTITION = 0x81, /* Minix Partition ID */ |
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| 42 | UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */ |
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| 43 | }; |
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| 44 | |||
| 45 | struct partition { |
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| 46 | unsigned char boot_ind; /* 0x80 - active */ |
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| 47 | unsigned char head; /* starting head */ |
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| 48 | unsigned char sector; /* starting sector */ |
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| 49 | unsigned char cyl; /* starting cylinder */ |
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| 50 | unsigned char sys_ind; /* What partition type */ |
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| 51 | unsigned char end_head; /* end head */ |
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| 52 | unsigned char end_sector; /* end sector */ |
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| 53 | unsigned char end_cyl; /* end cylinder */ |
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| 54 | unsigned int start_sect; /* starting sector counting from 0 */ |
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| 55 | unsigned int nr_sects; /* nr of sectors in partition */ |
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| 56 | } __attribute__((packed)); |
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| 57 | |||
| 58 | #ifdef __KERNEL__ |
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| 59 | struct hd_struct { |
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| 60 | sector_t start_sect; |
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| 61 | sector_t nr_sects; |
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| 62 | struct kobject kobj; |
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| 63 | unsigned reads, read_sectors, writes, write_sectors; |
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| 64 | int policy, partno; |
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| 65 | }; |
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| 66 | |||
| 67 | #define GENHD_FL_REMOVABLE 1 |
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| 68 | #define GENHD_FL_DRIVERFS 2 |
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| 69 | #define GENHD_FL_CD 8 |
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| 70 | #define GENHD_FL_UP 16 |
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| 71 | |||
| 72 | struct disk_stats { |
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| 73 | unsigned read_sectors, write_sectors; |
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| 74 | unsigned reads, writes; |
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| 75 | unsigned read_merges, write_merges; |
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| 76 | unsigned read_ticks, write_ticks; |
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| 77 | unsigned io_ticks; |
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| 78 | unsigned time_in_queue; |
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| 79 | }; |
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| 80 | |||
| 81 | struct gendisk { |
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| 82 | int major; /* major number of driver */ |
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| 83 | int first_minor; |
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| 84 | int minors; |
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| 85 | char disk_name[16]; /* name of major driver */ |
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| 86 | struct hd_struct **part; /* [indexed by minor] */ |
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| 87 | struct block_device_operations *fops; |
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| 88 | struct request_queue *queue; |
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| 89 | void *private_data; |
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| 90 | sector_t capacity; |
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| 91 | |||
| 92 | int flags; |
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| 93 | char devfs_name[64]; /* devfs crap */ |
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| 94 | int number; /* more of the same */ |
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| 95 | struct device *driverfs_dev; |
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| 96 | struct kobject kobj; |
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| 97 | |||
| 98 | struct timer_rand_state *random; |
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| 99 | int policy; |
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| 100 | |||
| 101 | unsigned sync_io; /* RAID */ |
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| 102 | unsigned long stamp, stamp_idle; |
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| 103 | int in_flight; |
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| 104 | #ifdef CONFIG_SMP |
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| 105 | struct disk_stats *dkstats; |
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| 106 | #else |
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| 107 | struct disk_stats dkstats; |
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| 108 | #endif |
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| 109 | }; |
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| 110 | |||
| 111 | /* |
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| 112 | * Macros to operate on percpu disk statistics: |
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| 113 | * Since writes to disk_stats are serialised through the queue_lock, |
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| 114 | * smp_processor_id() should be enough to get to the per_cpu versions |
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| 115 | * of statistics counters |
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| 116 | */ |
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| 117 | #ifdef CONFIG_SMP |
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| 118 | #define disk_stat_add(gendiskp, field, addnd) \ |
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| 119 | (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd) |
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| 120 | #define disk_stat_read(gendiskp, field) \ |
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| 121 | ({ \ |
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| 122 | typeof(gendiskp->dkstats->field) res = 0; \ |
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| 123 | int i; \ |
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| 124 | for (i=0; i < NR_CPUS; i++) { \ |
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| 125 | if (!cpu_possible(i)) \ |
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| 126 | continue; \ |
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| 127 | res += per_cpu_ptr(gendiskp->dkstats, i)->field; \ |
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| 128 | } \ |
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| 129 | res; \ |
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| 130 | }) |
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| 131 | |||
| 132 | static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) { |
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| 133 | int i; |
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| 134 | for (i=0; i < NR_CPUS; i++) { |
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| 135 | if (cpu_possible(i)) { |
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| 136 | memset(per_cpu_ptr(gendiskp->dkstats, i), value, |
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| 137 | sizeof (struct disk_stats)); |
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| 138 | } |
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| 139 | } |
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| 140 | } |
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| 141 | |||
| 142 | #else |
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| 143 | #define disk_stat_add(gendiskp, field, addnd) (gendiskp->dkstats.field += addnd) |
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| 144 | #define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field) |
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| 145 | |||
| 146 | static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) { |
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| 147 | memset(&gendiskp->dkstats, value, sizeof (struct disk_stats)); |
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| 148 | } |
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| 149 | #endif |
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| 150 | |||
| 151 | #define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1) |
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| 152 | #define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1) |
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| 153 | #define disk_stat_sub(gendiskp, field, subnd) \ |
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| 154 | disk_stat_add(gendiskp, field, -subnd) |
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| 155 | |||
| 156 | |||
| 157 | /* Inlines to alloc and free disk stats in struct gendisk */ |
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| 158 | #ifdef CONFIG_SMP |
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| 159 | static inline int init_disk_stats(struct gendisk *disk) |
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| 160 | { |
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| 161 | disk->dkstats = alloc_percpu(struct disk_stats); |
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| 162 | if (!disk->dkstats) |
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| 163 | return 0; |
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| 164 | return 1; |
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| 165 | } |
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| 166 | |||
| 167 | static inline void free_disk_stats(struct gendisk *disk) |
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| 168 | { |
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| 169 | free_percpu(disk->dkstats); |
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| 170 | } |
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| 171 | #else /* CONFIG_SMP */ |
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| 172 | static inline int init_disk_stats(struct gendisk *disk) |
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| 173 | { |
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| 174 | return 1; |
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| 175 | } |
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| 176 | |||
| 177 | static inline void free_disk_stats(struct gendisk *disk) |
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| 178 | { |
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| 179 | } |
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| 180 | #endif /* CONFIG_SMP */ |
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| 181 | |||
| 182 | /* drivers/block/ll_rw_blk.c */ |
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| 183 | extern void disk_round_stats(struct gendisk *disk); |
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| 184 | |||
| 185 | /* drivers/block/genhd.c */ |
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| 186 | extern void add_disk(struct gendisk *disk); |
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| 187 | extern void del_gendisk(struct gendisk *gp); |
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| 188 | extern void unlink_gendisk(struct gendisk *gp); |
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| 189 | extern struct gendisk *get_gendisk(dev_t dev, int *part); |
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| 190 | |||
| 191 | extern void set_device_ro(struct block_device *bdev, int flag); |
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| 192 | extern void set_disk_ro(struct gendisk *disk, int flag); |
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| 193 | |||
| 194 | /* drivers/char/random.c */ |
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| 195 | extern void add_disk_randomness(struct gendisk *disk); |
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| 196 | extern void rand_initialize_disk(struct gendisk *disk); |
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| 197 | |||
| 198 | static inline sector_t get_start_sect(struct block_device *bdev) |
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| 199 | { |
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| 200 | return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect; |
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| 201 | } |
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| 202 | static inline sector_t get_capacity(struct gendisk *disk) |
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| 203 | { |
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| 204 | return disk->capacity; |
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| 205 | } |
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| 206 | static inline void set_capacity(struct gendisk *disk, sector_t size) |
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| 207 | { |
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| 208 | disk->capacity = size; |
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| 209 | } |
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| 210 | |||
| 211 | #endif /* __KERNEL__ */ |
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| 212 | |||
| 213 | #ifdef CONFIG_SOLARIS_X86_PARTITION |
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| 214 | |||
| 215 | #define SOLARIS_X86_NUMSLICE 8 |
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| 216 | #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL) |
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| 217 | |||
| 218 | struct solaris_x86_slice { |
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| 219 | ushort s_tag; /* ID tag of partition */ |
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| 220 | ushort s_flag; /* permission flags */ |
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| 221 | unsigned int s_start; /* start sector no of partition */ |
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| 222 | unsigned int s_size; /* # of blocks in partition */ |
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| 223 | }; |
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| 224 | |||
| 225 | struct solaris_x86_vtoc { |
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| 226 | unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */ |
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| 227 | unsigned int v_sanity; /* to verify vtoc sanity */ |
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| 228 | unsigned int v_version; /* layout version */ |
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| 229 | char v_volume[8]; /* volume name */ |
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| 230 | ushort v_sectorsz; /* sector size in bytes */ |
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| 231 | ushort v_nparts; /* number of partitions */ |
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| 232 | unsigned int v_reserved[10]; /* free space */ |
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| 233 | struct solaris_x86_slice |
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| 234 | v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */ |
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| 235 | unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */ |
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| 236 | char v_asciilabel[128]; /* for compatibility */ |
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| 237 | }; |
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| 238 | |||
| 239 | #endif /* CONFIG_SOLARIS_X86_PARTITION */ |
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| 240 | |||
| 241 | #ifdef CONFIG_BSD_DISKLABEL |
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| 242 | /* |
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| 243 | * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il> |
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| 244 | * updated by Marc Espie <Marc.Espie@openbsd.org> |
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| 245 | */ |
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| 246 | |||
| 247 | /* check against BSD src/sys/sys/disklabel.h for consistency */ |
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| 248 | |||
| 249 | #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */ |
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| 250 | #define BSD_MAXPARTITIONS 8 |
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| 251 | #define OPENBSD_MAXPARTITIONS 16 |
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| 252 | #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */ |
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| 253 | struct bsd_disklabel { |
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| 254 | __u32 d_magic; /* the magic number */ |
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| 255 | __s16 d_type; /* drive type */ |
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| 256 | __s16 d_subtype; /* controller/d_type specific */ |
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| 257 | char d_typename[16]; /* type name, e.g. "eagle" */ |
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| 258 | char d_packname[16]; /* pack identifier */ |
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| 259 | __u32 d_secsize; /* # of bytes per sector */ |
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| 260 | __u32 d_nsectors; /* # of data sectors per track */ |
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| 261 | __u32 d_ntracks; /* # of tracks per cylinder */ |
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| 262 | __u32 d_ncylinders; /* # of data cylinders per unit */ |
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| 263 | __u32 d_secpercyl; /* # of data sectors per cylinder */ |
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| 264 | __u32 d_secperunit; /* # of data sectors per unit */ |
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| 265 | __u16 d_sparespertrack; /* # of spare sectors per track */ |
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| 266 | __u16 d_sparespercyl; /* # of spare sectors per cylinder */ |
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| 267 | __u32 d_acylinders; /* # of alt. cylinders per unit */ |
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| 268 | __u16 d_rpm; /* rotational speed */ |
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| 269 | __u16 d_interleave; /* hardware sector interleave */ |
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| 270 | __u16 d_trackskew; /* sector 0 skew, per track */ |
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| 271 | __u16 d_cylskew; /* sector 0 skew, per cylinder */ |
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| 272 | __u32 d_headswitch; /* head switch time, usec */ |
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| 273 | __u32 d_trkseek; /* track-to-track seek, usec */ |
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| 274 | __u32 d_flags; /* generic flags */ |
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| 275 | #define NDDATA 5 |
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| 276 | __u32 d_drivedata[NDDATA]; /* drive-type specific information */ |
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| 277 | #define NSPARE 5 |
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| 278 | __u32 d_spare[NSPARE]; /* reserved for future use */ |
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| 279 | __u32 d_magic2; /* the magic number (again) */ |
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| 280 | __u16 d_checksum; /* xor of data incl. partitions */ |
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| 281 | |||
| 282 | /* filesystem and partition information: */ |
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| 283 | __u16 d_npartitions; /* number of partitions in following */ |
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| 284 | __u32 d_bbsize; /* size of boot area at sn0, bytes */ |
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| 285 | __u32 d_sbsize; /* max size of fs superblock, bytes */ |
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| 286 | struct bsd_partition { /* the partition table */ |
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| 287 | __u32 p_size; /* number of sectors in partition */ |
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| 288 | __u32 p_offset; /* starting sector */ |
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| 289 | __u32 p_fsize; /* filesystem basic fragment size */ |
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| 290 | __u8 p_fstype; /* filesystem type, see below */ |
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| 291 | __u8 p_frag; /* filesystem fragments per block */ |
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| 292 | __u16 p_cpg; /* filesystem cylinders per group */ |
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| 293 | } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */ |
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| 294 | }; |
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| 295 | |||
| 296 | #endif /* CONFIG_BSD_DISKLABEL */ |
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| 297 | |||
| 298 | #ifdef CONFIG_UNIXWARE_DISKLABEL |
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| 299 | /* |
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| 300 | * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl> |
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| 301 | * and Krzysztof G. Baranowski <kgb@knm.org.pl> |
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| 302 | */ |
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| 303 | |||
| 304 | #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */ |
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| 305 | #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */ |
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| 306 | #define UNIXWARE_NUMSLICE 16 |
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| 307 | #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */ |
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| 308 | |||
| 309 | struct unixware_slice { |
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| 310 | __u16 s_label; /* label */ |
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| 311 | __u16 s_flags; /* permission flags */ |
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| 312 | __u32 start_sect; /* starting sector */ |
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| 313 | __u32 nr_sects; /* number of sectors in slice */ |
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| 314 | }; |
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| 315 | |||
| 316 | struct unixware_disklabel { |
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| 317 | __u32 d_type; /* drive type */ |
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| 318 | __u32 d_magic; /* the magic number */ |
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| 319 | __u32 d_version; /* version number */ |
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| 320 | char d_serial[12]; /* serial number of the device */ |
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| 321 | __u32 d_ncylinders; /* # of data cylinders per device */ |
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| 322 | __u32 d_ntracks; /* # of tracks per cylinder */ |
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| 323 | __u32 d_nsectors; /* # of data sectors per track */ |
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| 324 | __u32 d_secsize; /* # of bytes per sector */ |
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| 325 | __u32 d_part_start; /* # of first sector of this partition */ |
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| 326 | __u32 d_unknown1[12]; /* ? */ |
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| 327 | __u32 d_alt_tbl; /* byte offset of alternate table */ |
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| 328 | __u32 d_alt_len; /* byte length of alternate table */ |
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| 329 | __u32 d_phys_cyl; /* # of physical cylinders per device */ |
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| 330 | __u32 d_phys_trk; /* # of physical tracks per cylinder */ |
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| 331 | __u32 d_phys_sec; /* # of physical sectors per track */ |
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| 332 | __u32 d_phys_bytes; /* # of physical bytes per sector */ |
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| 333 | __u32 d_unknown2; /* ? */ |
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| 334 | __u32 d_unknown3; /* ? */ |
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| 335 | __u32 d_pad[8]; /* pad */ |
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| 336 | |||
| 337 | struct unixware_vtoc { |
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| 338 | __u32 v_magic; /* the magic number */ |
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| 339 | __u32 v_version; /* version number */ |
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| 340 | char v_name[8]; /* volume name */ |
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| 341 | __u16 v_nslices; /* # of slices */ |
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| 342 | __u16 v_unknown1; /* ? */ |
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| 343 | __u32 v_reserved[10]; /* reserved */ |
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| 344 | struct unixware_slice |
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| 345 | v_slice[UNIXWARE_NUMSLICE]; /* slice headers */ |
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| 346 | } vtoc; |
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| 347 | |||
| 348 | }; /* 408 */ |
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| 349 | |||
| 350 | #endif /* CONFIG_UNIXWARE_DISKLABEL */ |
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| 351 | |||
| 352 | #ifdef CONFIG_MINIX_SUBPARTITION |
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| 353 | # define MINIX_NR_SUBPARTITIONS 4 |
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| 354 | #endif /* CONFIG_MINIX_SUBPARTITION */ |
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| 355 | |||
| 356 | #ifdef __KERNEL__ |
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| 357 | |||
| 358 | char *disk_name (struct gendisk *hd, int part, char *buf); |
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| 359 | |||
| 360 | extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev); |
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| 361 | extern void add_partition(struct gendisk *, int, sector_t, sector_t); |
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| 362 | extern void delete_partition(struct gendisk *, int); |
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| 363 | |||
| 364 | extern struct gendisk *alloc_disk(int minors); |
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| 365 | extern struct kobject *get_disk(struct gendisk *disk); |
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| 366 | extern void put_disk(struct gendisk *disk); |
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| 367 | |||
| 368 | extern void blk_register_region(dev_t dev, unsigned long range, |
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| 369 | struct module *module, |
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| 370 | struct kobject *(*probe)(dev_t, int *, void *), |
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| 371 | int (*lock)(dev_t, void *), |
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| 372 | void *data); |
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| 373 | extern void blk_unregister_region(dev_t dev, unsigned long range); |
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| 374 | |||
| 375 | static inline struct block_device *bdget_disk(struct gendisk *disk, int index) |
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| 376 | { |
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| 377 | return bdget(MKDEV(disk->major, disk->first_minor) + index); |
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| 378 | } |
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| 379 | |||
| 380 | #endif |
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| 381 | |||
| 382 | #endif |