Peter Jeremy wrote: >On Mon, 2004-Jul-19 21:29:54 -0700, Tim Kientzle wrote: > > >>I have some ideas about sparse file handling, >>but they're not gtar-compatible. (The gtar >>approach has a number of drawbacks. The primary >>one being that on many systems it requires reading >>the entire file twice, once to find holes and again >>to actually archive the file. >> >> > >Actually, it's not possible to accurately determine the holes in a >file by reading it - you can't differentiate between a hole and a >allocated block of zeroes. What you need is a (new) syscall that >invokes a new VOP_... and returns a bitmap of allocated blocks. This >would be non-trival unfortunately. > OR, given the right flags, note all blocks of zeros as if they were unallocated, and write them that way.. regardless of how it was in the original file. > > >Received on Tue Jul 20 2004 - 15:28:30 UTC
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