On Mon, Apr 30, 2007 at 10:47:02AM +1000, David Chinner wrote:
> For FA_ALLOCATE, it's supposed to change the file size if we

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> allocate past EOF, right?

I would argue no.  Use truncate for that.
> For FA_DEALLOCATE, does it change the filesize at all?
Same as above.
> Or does

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> it just punch a hole in the file?

Yes.
> FWIW, we definitely need a FA_PREALLOCATE mode (FA_ALLOCATE but does

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> not change file size) so we can preallocate beyond EOF for apps

> which use O_APPEND (i.e. changing file size would cause problems for

> them).

FA_ALLOCATE should be able to allocate past-EOF I would argue.

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