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If we have to create a big symlink (i.e. one that doesn't fit into
i_block[]), we are not 64bit block safe and the namei code does not
handle extents at all.  Fix both.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>