Method, system and computer program product for implementing copy-on-write of a file
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United States of America Patent
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Aug 1, 2006
Grant Date -
Nov 4, 2004
app pub date -
Apr 29, 2003
filing date -
Apr 29, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Various copy-on-write implementations for a computing environment are presented. One copy-on-write implementation includes employing a read mapping table to perform a first virtual block to physical block mapping for use in reading a block of data of a file to be copy-on-written from physical storage for modification; and employing a different, write mapping table to perform a second virtual block to physical block mapping for use in writing a modified block of the file data to physical storage, wherein copy-on-write of the block of data is achieved using a single write operation. In another implementation, a distributed copy-on-write of a file for a client server environment is presented. This distributed copy-on-write includes performing, by a first client, copy-on-write of at least one block of data of the file to be copy-on-written, and performing, by a second client, copy-on-write of at least one other block of data of the file, wherein multiple clients perform the copy-on-write of the file.
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