Linux mount bind vs rbind and umount rbind

最近注意到mount的选项里, 有一个--bind, 还有一个--rbind

man 手册上有相关介绍:

The  bind  mount  call  attaches only (part of) a single filesystem, not possible submounts. The entire file hierarchy
including submounts is attached a second place using

mount --rbind olddir newdir

or shortoption

mount -R olddir newdir

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