发明申请
US20050044080A1 Management of the file-modification time attribute in a multi-processor file server system
有权
管理多处理器文件服务器系统中的文件修改时间属性
- 专利标题: Management of the file-modification time attribute in a multi-processor file server system
- 专利标题(中): 管理多处理器文件服务器系统中的文件修改时间属性
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申请号: US10645976申请日: 2003-08-22
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公开(公告)号: US20050044080A1公开(公告)日: 2005-02-24
- 发明人: Stephen Fridella , Gang Ma , Xiaoye Jiang , Sorin Faibish , Rui Liang
- 申请人: Stephen Fridella , Gang Ma , Xiaoye Jiang , Sorin Faibish , Rui Liang
- 主分类号: G06F17/30
- IPC分类号: G06F17/30
摘要:
To permit multiple unsynchronized processors to update the file-modification time attribute of a file during concurrent asynchronous writes to the file, a primary processor having a clock manages access to metadata of the file. A number of secondary processors service client request for access to the file. Each secondary processor has a timer. When the primary processor grants a range lock upon the file to a secondary, it returns its clock time (m). Upon receipt, the secondary starts a local timer (t). When the secondary modifies the file data, it determines a file-modification time that is a function of the clock time and the timer interval, such as a sum (m+t). When the secondary receives an updated file-modification time (mp) from the primary, if mp>m+t, then the secondary updates the clock time (m) to (mp) and resets its local timer.
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