xfs: take the ilock shared if possible in xfs_file_iomap_begin
We always just read the extent first, and will later lock exlusively after first dropping the lock in case we actually allocate blocks. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
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