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    Handling copy on first write data for snapshot purposes
    4.
    发明授权
    Handling copy on first write data for snapshot purposes 有权
    处理第一次写入数据的副本用于快照

    公开(公告)号：US08874524B1

    公开(公告)日：2014-10-28

    申请号：US13530503

    申请日：2012-06-22

    Applicant: Junping Zhao ,  Ivan Bassov ,  Kevin Xu ,  Gang Xie ,  Jialin Yang ,  Wei Qi

    Inventor： Junping Zhao ,  Ivan Bassov ,  Kevin Xu ,  Gang Xie ,  Jialin Yang ,  Wei Qi

    IPC: G06F7/00 ,  G06F17/30

    CPC classification number: G06F17/30088 ,  G06F11/2071 ,  G06F2201/84

    Abstract: A technique performs a write operation. The technique involves receiving, after a snapshot of a file system is taken, a write instruction to write new data to a particular portion of the file system. The technique further involves includes reading, in response to the write instruction, metadata to determine whether the new data is a first update of the particular portion since the snapshot was taken. The metadata identifies portions of the file system which have changed since the snapshot was taken. The technique further involves, when the new data is a first update of the particular portion since the snapshot was taken, copying the original data from cache memory (i.e., from the file system buffer cache) to snapshot storage (i.e., to a dedicated save area) and, after the original data is copied, updating the original data in the cache memory with the new data.

    Abstract translation: 一种技术执行写操作。 该技术涉及在文件系统的快照之后接收写入指令以将新数据写入文件系统的特定部分。 该技术还包括响应于写入指令读取元数据以确定新数据是否是拍摄快照以来特定部分的第一更新。 元数据标识自拍摄快照以来已经更改的文件系统的部分。 该技术还涉及当新数据是拍摄快照后特定部分的第一次更新时，将原始数据从高速缓冲存储器（即，从文件系统缓冲区高速缓存）复制到快照存储（即，到专用保存 区域），并且在原始数据被复制之后，用新数据更新高速缓冲存储器中的原始数据。

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