raid5.h.txt

这是一个牛人的linux学习内核时分析内核的笔记

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相关文件
	/drivers/md/raid5.c

************************结构*********************************
struct stripe_head {	//这个结构是条纹的头指针
        struct stripe_head      *hash_next, **hash_pprev; 
        struct list_head        lru;                    
        struct raid5_private_data       *raid_conf;
        struct buffer_head      *bh_cache[MD_SB_DISKS];
        struct buffer_head      *bh_read[MD_SB_DISKS]; 
        struct buffer_head      *bh_write[MD_SB_DISKS];
        struct buffer_head      *bh_written[MD_SB_DISKS];
        unsigned long           sector;	//对于条纹中的每一个磁盘它的扇区的读					//写都是对应于同一个扇区的            
        int                     size;                   
        int                     pd_idx;                 
        unsigned long           state;                  
        atomic_t                count;                  
        spinlock_t              lock;
        int                     sync_redone;
};

struct raid5_conf_t
struct raid5_private_data {
        struct stripe_head      **stripe_hashtbl;
        mddev_t                 *mddev;
        mdk_thread_t            *thread, *resync_thread;
        struct disk_info        disks[MD_SB_DISKS];
        struct disk_info        *spare;
        int                     buffer_size;
        int                     chunk_size, 	//块大小，也就是每个条纹单位							//的大小，字节单位
	int			level, algorithm;
        int                     raid_disks,	//阵列中所有的磁盘数，不包括						//热闲置盘
	int			working_disks,	//还在工作的磁盘数
	int 			failed_disks;
        int                     resync_parity;
        int                     max_nr_stripes;
        struct list_head        handle_list; 	//需要处理的条纹 */        
        atomic_t                active_stripes;
        struct list_head        inactive_list;
        md_wait_queue_head_t    wait_for_stripe;//等待条纹的释放，条纹的						//stripe_head有一定的数量的

        md_spinlock_t           device_lock;
}
typedef struct raid5_private_data raid5_conf_t	//配置结构


struct disk_info {
        kdev_t  dev;		
        int     operational;
        int     number;
        int     raid_disk;
        int     write_only;
        int     spare;
        int     used_slot;
};

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