快照的快照删除：cannot delete dir - Directory not empty

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事件概要：第一次测试创建快照的快照后，想要把其删除快照。但失败，失败提示如下：

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[iyunv@mylinux ~]# btrfs subvolume delete /mydata/logs_snapshot Delete subvolume (no-commit): '/mydata/logs_snapshot' ERROR: cannot delete '/mydata/logs_snapshot' - Directory not empty

一步步跟着老师的脚步操作，怎么我的就失败了呢，各种纠结，下面是问题处理过程命令：

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[iyunv@mylinux ~]# btrfs subvolume delete /mydata/logs_snapshot/ Delete subvolume (no-commit): '/mydata/logs_snapshot' ERROR: cannot delete '/mydata/logs_snapshot' - Directory not empty You have new mail in /var/spool/mail/root #查看文件夹快照logs_snapshot里面内容 [iyunv@mylinux ~]# ls /mydata/logs_snapshot grub2.cfg  logs #尝试删除快照文件夹里的文件，但目录不可这样删除，需要加-rf参数 [iyunv@mylinux ~]# rm /mydata/logs_snapshot/* rm: remove regular file ‘/mydata/logs_snapshot/grub2.cfg’? y rm: cannot remove ‘/mydata/logs_snapshot/logs’: Is a directory [iyunv@mylinux ~]# ll -a /mydata/logs_snapshot total 16 drwxr-xr-x. 1 root root  8 Oct  5 17:05 . drwxr-xr-x. 1 root root 90 Oct  5 17:03 .. drwxr-xr-x. 1 root root 18 Oct  5 16:51 logs [iyunv@mylinux mydata]# rm -rf logs_snapshot    #加上-rf参数尝试删除文件夹logs但失败了 rm: cannot remove ‘logs_snapshot/logs’: Operation not permitted [iyunv@mylinux mydata]# chmod  777 logs_snapshot    #对该文件授权 [iyunv@mylinux mydata]# ll total 24 -rw-r--r--. 1 root root     0 Oct  5 12:47 a.txt drwxr-xr-x. 1 root root     0 Oct  5 16:18 cache -rw-r--r--. 1 root root 13948 Oct  5 13:03 functions -rw-r--r--. 1 root root  5137 Oct  5 12:47 grub2.cfg drwxr-xr-x. 1 root root    18 Oct  5 16:59 logs drwxrwxrwx. 1 root root     8 Oct  5 17:05 logs_snapshot [iyunv@mylinux mydata]# rm -rf logs_snapshot    #仍然无法删除 rm: cannot remove ‘logs_snapshot/logs’: Operation not permitted #就这样折腾了好长一段时间，网上资料也找过尝试过但无果，这时候脑海里出现，为何不先查看快照列表 [iyunv@mylinux logs_snapshot]# btrfs subvolume list /mydata ID 266 gen 104 top level 5 path cache ID 267 gen 122 top level 5 path logs ID 270 gen 128 top level 5 path logs_snapshot ID 271 gen 126 top level 270 path logs_snapshot/logs    #这就是病根 #快照的快照需要先删除最里层的，方可删除外面的快照。 [iyunv@mylinux logs_snapshot]# btrfs subvolume delete /mydata/logs_snapshot/logs Delete subvolume (no-commit): '/mydata/logs_snapshot/logs' [iyunv@mylinux logs_snapshot]# ls [iyunv@mylinux logs_snapshot]# cd .. [iyunv@mylinux mydata]# btrfs subvolume delete /mydata/logs_snapshot Delete subvolume (no-commit): '/mydata/logs_snapshot' [iyunv@mylinux mydata]# btrfs subvolume list /mydata ID 266 gen 104 top level 5 path cache ID 267 gen 122 top level 5 path logs