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UDF discards file preallocations on every ->put_inode which is totally
bogus.  It already discards them in ->release which makes sense for normal
writes, so the only additional discard is in ->clear_inode so we make sure
we don't leak any reservations for shared writeable mappings.

This follows similar changes to ext2 and ext3.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>