linux内核md源代码解读 八 阵列同步二：同步过程

7346         j = 0;  
7347         if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {  
7348                 /* resync follows the size requested by the personality, 
7349                  * which defaults to physical size, but can be virtual size 
7350                  */
7351                 max_sectors = mddev->resync_max_sectors;  
7352                 mddev->resync_mismatches = 0;  
7353                 /* we don't use the checkpoint if there's a bitmap */
7354                 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))  
7355                         j = mddev->resync_min;  
7356                 else if (!mddev->bitmap)  
7357                         j = mddev->recovery_cp;  
7358   
7359         } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))  
7360                 max_sectors = mddev->resync_max_sectors;  
7361         else {  
7362                 /* recovery follows the physical size of devices */
7363                 max_sectors = mddev->dev_sectors;  
7364                 j = MaxSector;  
7365                 rcu_read_lock();  
7366                 rdev_for_each_rcu(rdev, mddev)  
7367                         if (rdev->raid_disk >= 0 &&  
7368                             !test_bit(Faulty, &rdev->flags) &&  
7369                             !test_bit(In_sync, &rdev->flags) &&  
7370                             rdev->recovery_offset < j)  
7371                                 j = rdev->recovery_offset;  
7372                 rcu_read_unlock();  
7373         }  
7374   
7375         printk(KERN_INFO "md: %s of RAID array %sn", desc, mdname(mddev));  
7376         printk(KERN_INFO "md: minimum _guaranteed_  speed:"
7377                 " %d KB/sec/disk.n", speed_min(mddev));  
7378         printk(KERN_INFO "md: using maximum available idle IO bandwidth "
7379                "(but not more than %d KB/sec) for %s.n",  
7380                speed_max(mddev), desc);  
7381   
7382         is_mddev_idle(mddev, 1); /* this initializes IO event counters */

7347行，是同步。

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