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What to test
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(1) lseek value after a getdents matches the d_off of the last entry
    received.
(2) lseek using d_off and then getdents gets the proper entry.
(3) lseek using d_off and then getdents with (d_reclen -1) returns EINVAL.

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How to test
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(1) make test
(2) Check the result manually.