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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
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Subject: BIO_DELETE equivalent for file on FFS filesystem
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is it possible. suppose i have 1GB file with my data and 100 1 megabyte 
parts of it is no longer needed. i could reorganize that file to take 
900MB or... can i call some system function to "punch" holes?