Some filesystems may allow multiple files to point to a particular
extent.  This patch adds flag FIEMAP_EXTENT_SHARED to denote extents
that are shared with other inodes.
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>
Acked-by: NMark Fasheh <mfasheh@suse.com>
Signed-off-by: NJoel Becker <joel.becker@oracle.com>