genhd.h.txt

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这是普通硬盘的分区头文件

相关文件：
	/drivers/block/genhd.c

************************基本数据结构*********************************
(1):struct gendisk {
        int major;                      /* major number of driver */
        const char *major_name;         /* name of major driver */
        int minor_shift;               /* number of times minor is shifted to
                                           get real minor */
        int max_p;                      /* maximum partitions per device */
        struct hd_struct *part;         /* [indexed by minor] */
        int *sizes;                     /* [idem], device size in blocks */
        int nr_real;                    /* number of real devices */
        void *real_devices;             /* internal use */
        struct gendisk *next;
        struct block_device_operations *fops;
        devfs_handle_t *de_arr;         /* one per physical disc */
        char *flags;                    /* one per physical disc */
     };

(2):struct hd_struct {
        long start_sect;		//开始扇区
        long nr_sects;			//扇区数量
        devfs_handle_t de;      	//devfs的入口
        /* Performance status: */
        unsigned int ios_in_flight;
        unsigned int io_ticks;
        unsigned int last_idle_time;
        unsigned int last_queue_change;
        unsigned int aveq;
        unsigned int rd_ios;
        unsigned int rd_merges;
        unsigned int rd_ticks;
        unsigned int rd_sectors;
        unsigned int wr_ios;
        unsigned int wr_merges;
        unsigned int wr_ticks;
        unsigned int wr_sectors;
    };


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