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    SubjectRe: [PATCH v3] fs: Invalidate the cache for a parent block-device if fsync() is called for a partition
    On Tue, 31 Jan 2012 14:04:25 -0500
    Christoph Hellwig <hch@infradead.org> wrote:

    > On Tue, Jan 31, 2012 at 10:58:24AM -0800, Andrew Morton wrote:
    > > One concern I have with the proposal is that it would forever rule out
    > > support of >16T devices on 32-bit machines.
    > >
    > > At present with 64-bit sector_t and 32-bit pgoff_t, I think we'd have a
    > > reasonable chance of supporting, say, four 8T partitions on a 32T
    > > device. But if we were to switch the kernel from using four 4T
    > > address_spaces (sda1-4) over to using a single 32T address_space (sda)
    > > then we can rule it all out.
    >
    > how do you plan to write the partition label in your hypothetic setup
    > if you can't open the main device?
    >
    > And even if we solved that and people could create partitions on these
    > devices but not open the main device, or use large lvm volumes it would
    > be an absolutely major confusion.
    >

    I didn't say the kernel would support this as-is.

    If the partitioning scheme requires writing to the individual
    partitions then something would need to be done, such as a simple
    offsetting DM driver.


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