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    • 2. 发明授权
    • Handling copy on first write data for snapshot purposes
    • 处理第一次写入数据的副本用于快照
    • US08874524B1
    • 2014-10-28
    • US13530503
    • 2012-06-22
    • Junping ZhaoIvan BassovKevin XuGang XieJialin YangWei Qi
    • Junping ZhaoIvan BassovKevin XuGang XieJialin YangWei Qi
    • G06F7/00G06F17/30
    • G06F17/30088G06F11/2071G06F2201/84
    • 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.
    • 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。
    • 3. 发明授权
    • Calculating quota usage without impacting file system services
    • 计算配额使用而不影响文件系统服务
    • US08554809B1
    • 2013-10-08
    • US13116913
    • 2011-05-26
    • Yingchao ZhouWei KangWeigang ZhongChen GongKevin XuSitaram Pawar
    • Yingchao ZhouWei KangWeigang ZhongChen GongKevin XuSitaram Pawar
    • G06F7/00
    • G06F17/30082
    • An online tree quota check tool computes quota usage of files in a directory tree while the structure of the directory tree keeps changing due to concurrent write access by other applications and clients. The quota check tool computes the quota usage without interfering with the ongoing file access operations that change the directory content and quota usage. A quota check database keeps track of which files have been checked and which have not, so that each file is checked and its quota usage is accumulated once and only once while directories are moved and directory scans are restarted as a result of the changing directory content. File system operations are modified to synchronize with the online tree quota check. The quota check tool can be single threaded or multi-threaded. A multi-threaded tool dispatches idle directory iteration threads to scan subdirectories in the directory tree.
    • 在线树配额检查工具计算目录树中文件的配额使用,而目录树的结构由于其他应用程序和客户端的并发写入访问而不断变化。 配额检查工具计算配额使用情况,而不会影响正在进行的文件访问操作,这些操作会更改目录内容和配额使用情况。 配额检查数据库跟踪哪些文件已被检查,哪些文件没有被检查,以便每个文件被检查,并且其目录被移动并且由于更改目录内容而重新启动目录扫描时一次且仅存储一次的配额使用 。 文件系统操作被修改为与在线树配额检查同步。 配额检查工具可以是单线程或多线程。 多线程工具调度空闲的目录循环线程来扫描目录树中的子目录。