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    SubjectRe: [RFC] mount flag "direct" (fwd)
    On Wed, 4 Sep 2002, Daniel Phillips wrote:

    >
    > You're well wide of the mark here, in that you're relying on the assumption
    > that caching is important to the application he has in mind. The raw transfer
    > bandwidth may well be sufficient, especially if it is unimpeded by being
    > funneled through a bottleneck like our vfs cache.
    >

    the fact that he is saying that this needs to run normal filesystems tells
    us that.

    if you need a filesystem to max out transfer rate and don't want to have
    it cache things that is a VERY specialized thing and not something that
    will match what NTFS/XFS/JFS/ReiserFS/ext2 etc are going to be used for.

    either he has a very specialized need (in which case a specialized
    filesystem is probably the best bet anyway) or he is trying to support
    normal uses (in which case caching is important)

    however the point is that the read-modify-write cycle is a form of cache,
    it is only safe if you aquire a lock at the beginning of it and release it
    at the end. A standard filesystem won't do this, this is what makes a DFS.

    David Lang

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