There are no "specs" as to how a sparse file is handled in response to writes.
Sparse is mostly beneficial when the holes are very large.
If an app really wants to have minimal on disk space, you should pre-allocate space with fallocate.
You may even need to hole punch after the writes. Both xfs and ext4 support both fallocate and hole punching. (I don't know the userspace call to hole punch. I think its a relatively new feature for ext4.)
Greg
On Aug 4, 2011 10:16 PM, "Ashish Sangwan" <ashishsangwan2@xxxxxxxxx> wrote:
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