linux内核md源代码解读 七 阵列同步一 ：先容阵列同步

7780行，设置同步运行状态。同步状态有如下：

     /* recovery/resync flags  
     * NEEDED:   we might need to start a resync/recover 
     * RUNNING:  a thread is running, or about to be started 
     * SYNC:     actually doing a resync, not a recovery 
     * RECOVER:  doing recovery, or need to try it. 
     * INTR:     resync needs to be aborted for some reason 
     * DONE:     thread is done and is waiting to be reaped 
     * REQUEST:  user-space has requested a sync (used with SYNC) 
     * CHECK:    user-space request for check-only, no repair 
     * RESHAPE:  A reshape is happening 
     * 
     * If neither SYNC or RESHAPE are set, then it is a recovery. 
     */
#define     MD_RECOVERY_RUNNING     0  
#define     MD_RECOVERY_SYNC     1  
#define     MD_RECOVERY_RECOVER     2  
#define     MD_RECOVERY_INTR     3  
#define     MD_RECOVERY_DONE     4  
#define     MD_RECOVERY_NEEDED     5  
#define     MD_RECOVERY_REQUESTED     6  
#define     MD_RECOVERY_CHECK     7  
#define     MD_RECOVERY_RESHAPE     8  
#define     MD_RECOVERY_FROZEN     9

* NEEDED:   需要启动同步线程

* RUNNING:  准备启动或已经有同步线程有运行

* SYNC:     做同步操作

* RECOVER:  尝试或已经在重建操作

* INTR:     同步中断

* DONE:     同步完成

* REQUEST:  用户请求同步

* CHECK:    用户请求检查

* RESHAPE:  reshape操作

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