xfs: clean up locking in xfs_file_iomap_begin
Rather than checking what kind of locking is needed in a helper function and then jumping through hoops to do the locking in line, move the locking to the helper function that does all the checks and rename it to xfs_ilock_for_iomap(). This also allows us to hoist all the nonblocking checks up into the locking helper, further simplifier the code flow in xfs_file_iomap_begin() and making it easier to understand. Signed-Off-By: Dave Chinner <dchinner@redhat.com> Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
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