On Sun, Apr 29, 2007 at 10:25:59PM -0700, Chris Wedgwood wrote: > 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 > > allocate past EOF, right? > > I would argue no. Use truncate for that. I'm going from the ext4 implementation because the semantics have not been documented yet. IIRC, the argument for FA_ALLOCATE changing file size is that posix_fallocate() is supposed to change the file size. I think that having a mode for real preallocation and another for posix_fallocate is a valid thing to do... Note that the way XFS implements growing the file size after the allocation is via a truncate.... > > For FA_DEALLOCATE, does it change the filesize at all? > > Same as above. > > > Or does > > it just punch a hole in the file? > > Yes. That's would what I did because otherwise you'd use ftruncate64(). Without documented behaviour or an ext4 implementation, I have to ask what it's supposed to do, though ;) Cheers, Dave. -- Dave Chinner Principal Engineer SGI Australian Software Group - To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
