File system implementing write once read many (WORM)
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United States of America Patent
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May 23, 2017
Issued Date -
N/A
app pub date -
Oct 17, 2014
filing date -
Oct 24, 2013
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The embodiments deal with files that are already present in a storage when mounting the storage in a file system and files created after the mounting as different groups. (Metadata of) the files is classified. The files are each divided into metadata (index) and a file main body and are recorded on different storage areas, that is, an index partition (IP) and a data partition (DP), associated with each other. This file system is effective in a storage format in which a new file is merely written and an already written file is not updated or deleted (for example, a tape medium used in the LTFS). The embodiments implement a WORM file system by rejecting a request to update or delete a file that is present at mounting as a WORM file and permitting update or deletion of a file that is created after mounting until the storage is unmounted.
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