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    SubjectRe: statfs() / statvfs() syscall ballsup...
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    >>>>> " " == Linus Torvalds <torvalds@osdl.org> writes:

    > On Fri, 10 Oct 2003, Joel Becker wrote:
    >>
    >> msync() forces write(), like fsync(). It doesn't force read().

    > Actually, the kernel has a "readahead(fd, offset, size)" system
    > call that will start asynchronous read-ahead on any
    > mapping. After that, just touching the page will obviously map
    > in and synchronize the result.

    That's different. That's just preheating the page cache.

    It does nothing for the case Joel mentioned where 2 different nodes
    are writing to the same device, and you need to force a read in order
    to resynchronize the page cache.
    Apart from O_DIRECT, we have nothing in the kernel as it stands that
    will allow userland to deal with this case.

    Cheers,
    Trond
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