xfs: Introduce a helper routine to probe data or hole offset from page cache
Introduce helpers to probe data or hole offset from page cache. Signed-off-by: Jie Liu <jeff.liu@oracle.com> Reviewed-by: Mark Tinguely <tinguely@sgi.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Ben Myers <bpm@sgi.com>
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