On 07/12/17 08:27, Qu Wenruo wrote:
When doing snapshot, btrfs only needs to increase reference of 2nd highest level tree blocks of original snapshot, other than "walking the tree". (If tree root level is 2, then level 2 node is copied, while all reference of level 1 tree blocks get increased)
Out of curiosity, how does it interacts with nocow files? Does every write to these files involves backref walk?
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