dax: Convert dax_lock_mapping_entry to XArray
Instead of always retrying when we slept, only retry if the page has
moved.
Signed-off-by: 
Matthew Wilcox <willy@infradead.org>
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Instead of always retrying when we slept, only retry if the page has
moved.
Signed-off-by: Matthew Wilcox <willy@infradead.org>