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Problem Report 0530 Details

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Report 0530 Actions

    Problem Report Number 0530
    Submitter's Classification Test Suite problem
    State Resolved
    Resolution Rejected (REJ)
    Problem Resolution ID REJ.X.0149
    Raised 2002-04-19 08:00
    Updated 2003-03-13 08:00
    Published null
    Product Standard Network File System
    Certification Program The Open Brand certification program
    Test Suite VSX4+XNFS version 4.4.5
    Test Identification POSIX.os/ioprim/read 15
    Problem Summary PG4R.150 test15 works as follows, the test is on the server, but executes on the client. The test creates a file of 36 bytes on the NFS mount default filesystem, then opens it and seeks to the end. Then a one ...
    Problem Text
    test15 works as follows, the test is on the server, but executes on the client.
    The test creates a file of 36 bytes on the NFS mount default filesystem, then
    opens it and seeks to the end. Then a one byte read is done. The test then
    checks the atime of the file, but our implementation it finds that it hasn't
    changed.

    On our implementation, the file is cached on the client and when the read is
    done, it done on the cached copy. Thus the copy of the server is never accessed,
    note a write would cause an access on the server copy. This behavior matches
    allowed behavior as discussed in RFC 1813. Enum time_how is defined to control
    how atime and mtime are set from the client. One value of the enum is
    DONT_CHANGE, which means the client is not allowed to change the atime.
    Test Output
    ************************************************************************
    /tset/POSIX.os/ioprim/read/T.read 15 Failed

    Test Description:
    A successful call to read() at end of file marks for update the
    st_atime field of the file.
    Posix Ref: Component READ Assertion 6.4.1.2-21(A)

    Test Strategy:
    OPEN existing file containing 36 bytes of known data
    SEEK to end of file
    SAVE timestamps using fsavtimes() - (genlib)
    VERIFY that read(fd,buf,1) returns 0
    VERIFY that only the st_atime timestamp has changed using fchktimes()

    Test Information:
    time stamps incorrect: atime was not updated

    ************************************************************************

    Review Information

    Review Type TSMA Review
    Start Date null
    Completed null
    Status Complete
    Review Recommendation No Resolution Given
    Review Response
    This test was changed in 1993 to avoid exactly the problem described.
    Originally the file used was the same one used by earlier tests, and
    so the data may have been cached by the client. The modified test
    creates a new file on the server, and the client does not read from
    this file until after the first atime value has been obtained.

    Note that tests 13 and 15 are identical except that in test 13 the
    read() returns some data and in test 15 a seek to the end of the file
    is done, so that the read() returns an EOF indication. If test 13 is
    not failing on this implementation, then the failure of test 15 cannot
    be due to cached data on the client, and it would appear that the test
    has correctly identified a fault in the implementation.

    It is recommended that this request is refused.

    Review Type SA Review
    Start Date null
    Completed null
    Status Complete
    Review Resolution Rejected (REJ)
    Review Conclusion
    This request is refused.

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