如何对btrfs子卷进行递归快照? [英] How to take a recursive snapshot of a btrfs subvol?

问题描述

假设一个名为"child-subvol"的btrfs子卷在另一个子卷中说"root-subvol"，并且如果我们拍摄"root-subvol"的快照，那么"child-subvol"也应快照.

Assume that a btrfs subvol named "child-subvol" is within a another subvol say, "root-subvol" and if we take snapshot of "root-subvol" then, the "child-subvol" should also be taken a snapshot.

由于btrfs文件系统中尚不支持递归快照，因此又如何实现呢?

Since recursive snapshot support is not yet there in btrfs file system, how can this be achieved alternatively ?

推荐答案

步骤1:获取所有驻留的btrfs子卷.最好按以下命令所实现的排序顺序.

Step 1: Get all the residing btrfs sub-volumes. Preferably in the sorted order as achieved by the command below.

$ btrfs子卷列表-sort = -path <top_subvol>

$ btrfs subvolume list --sort=-path < top_subvol >

第2步:按照获得的优先顺序执行删除/快照操作.

Step 2: In the order of preference as obtained, perform delete/Snapshot operation.

$ btrfs子卷删除<subvol-name>

$ btrfs subvolume delete < subvol-name >

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