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locate holes in a sparse file.

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Top Forums Programming locate holes in a sparse file.
# 15  
Old 05-18-2009
bittorrent library used with version control for 3D engine map distribution
# 16  
Old 05-20-2009
The only Unix filesystem I am aware of that currently supports the functionality you are looking for is ZFS using the SEEK_HOLE and SEEK_DATA whence options to lseek(). From the Solaris lseek() man page:

- If whence is SEEK_HOLE, the offset of the start of the
next hole greater than or equal to the supplied offset
is returned.

- If whence is SEEK_DATA, the file pointer is set to the
start of the next non-hole file region greater than or
equal to the supplied offset.

There is also the Andreas Dilger FIEMAP extend mapping ioctl() proposal which I am aware of but have no real experience with. An implementation for Linux ext3 and ext4 filesystems is available. Do a Web search for FIEMAP and SEEK_HOLE for more information or read the Linux 2.6 kernel documentation file .../kernel/Documentation/filesystems/fiemap.txt
Last edited by fpmurphy; 05-20-2009 at 01:20 AM..
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