发明授权
US08117160B1 Methods and apparatus for creating point in time copies in a file system using reference counts
有权
使用引用计数在文件系统中创建时间点副本的方法和设备
- 专利标题： Methods and apparatus for creating point in time copies in a file system using reference counts
- 专利标题（中）： 使用引用计数在文件系统中创建时间点副本的方法和设备
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申请号： US12241715申请日： 2008-09-30
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公开(公告)号： US08117160B1公开(公告)日： 2012-02-14
- 发明人: Hongliang Tang , Sairam Veeraswamy , Peter Bixby
- 申请人： Hongliang Tang , Sairam Veeraswamy , Peter Bixby
- 申请人地址： US MA Hopkinton
- 专利权人： EMC Corporation
- 当前专利权人： EMC Corporation
- 当前专利权人地址： US MA Hopkinton
- 代理机构： Muirhead and Saturnelli, LLC
- 主分类号： G06F7/00
- IPC分类号： G06F7/00
摘要：
Embodiments of the invention relate to maintaining reference counts in a file system to track when a block is available to be freed. When a snapshot copy of a file is created, rather than copying all the blocks of the file for the snapshot copy, the snapshot inode is given pointers to the blocks of the file. Rather than updating the reference counts for all these blocks to indicate that they are now in use by more than one file, the update of reference counts for at least some of these blocks may be deferred until a later time.
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