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Problem Report 0514 Details

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Report 0514 Actions

    Problem Report Number 0514
    Submitter's Classification Specification problem
    State Resolved
    Resolution Rejected (REJ)
    Problem Resolution ID REJ.X.0133
    Raised 1996-10-29 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 4.3.5
    Test Identification POSIX.os/ioprim/read 21
    Problem Summary PG4R.134 >From the NFS protocol point of view, it is impossible for the NFS server to know that a particular client has a file system mounted read only. The server can only check if the local file system is re...
    Problem Text
    >From the NFS protocol point of view, it is impossible for the NFS server
    to know that a particular client has a file system mounted read only.
    The server can only check if the local file system is read only or if the
    file system is exported read only. Enforcement for file systems mounted
    on a client read only is the responsibility of the client. The protocol
    does not allow for a read request to indicate that the file system on the
    client is mounted read only. Thus, the atime update cannot be prevented.
    I don't feel that this assertion is applicable to XNFS.

    Note that the test case is using a read/write file system on the server
    and first mounts it read/write on the client to create the test file.
    It then unmounts it and then remounts it read only. The read is performed
    and the atime is modified.
    Test Output
    200|0 21 15:19:35|TP Start
    520|0 21 00010610 5 1|Call to read() changed time stamps on read-d.21/fread-t.21
    520|0 21 00010610 5 2|time stamps incorrect: atime was updated
    220|0 21 1 15:19:45|FAIL

    ************************************************************************
    /tset/POSIX.os/ioprim/read/T.read 21 Failed

    Test Description:
    If the implementation supports a read-only file system:
    When the file descriptor references a file on a read-only file
    system, then read() does not update the time related element
    st_atime of the file.
    Posix Ref: Component READ Assertion 6.4.1.2-X1(C)

    Test Strategy:
    CREATE directory
    CREATE child process
    OBTAIN the name of the readonly file system VSX_ROFS using vgetenv()
    - (vlib)
    EXECUTE new program using as parameters : name of readonly file
    system, directory name and file name
    SUBPROGRAM:
    CREATE file on readonly file system and mount it readonly using
    setuprofs() - (tsetlib)
    OPEN file on readonly file system using open()
    SAVE file timestamp using savtimes()
    READ data from file using read()
    VERIFY that 0 is returned and errno is unchanged
    VERIFY that time stamps were not changed using chktimes()
    UNMOUNT readonly file system and remove data file using
    clnuprofs() - (tsetlib)

    Test Information:
    Call to read() changed time stamps on read-d.21/fread-t.21
    time stamps incorrect: atime was updated
    ************************************************************************

    Review Information

    Review Type TSMA Review
    Start Date null
    Completed null
    Status Complete
    Review Recommendation No Resolution Given
    Review Response
    We recommend this request be refused, the specification
    is clear that writes to a read-only filesystem will fail
    when mounted with the read-only mode, regardless of the export
    mode. Therefore a read() function should not mark for update the st_atime
    field.

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

    Problem Reporting System Options:

     

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