Re: More benchmarking stuff...

[Matthew Dillon]

:According to kirk FSYNC() does the right thing and 'sync()' doesn't.
:

    Lets see... well, it will sync the file state, but it will not
    necessarily sync the related directory entry (as far as I can tell).

    So if you take a case such as sendmail creating a queue file, fsync
    will succeed and the file itself will be consistent, but the directory
    entry for the file may not yet have been created and synced.  A crash
    at that point would result in a missing file.

    Kirk would know for sure.

    -

    At some point we need to extend the kernel VOP_FSYNC API to include
    a file offset/range so NFS can conditionally fsync part of a file and
    know for sure that it's data and metadata have gone to the platter.
    And its directory entry as well in the case of a newly created file.

                                        -Matt
                                        Matthew Dillon 
                                        <[EMAIL PROTECTED]>


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