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    SubjectRe: data corruption using raid0+lvm2+jfs with 2.6.0-test3
    On Wed, Aug 13, 2003 at 09:05:58AM +1000, Neil Brown wrote:
    > A better solution, which is too much for 2.6.0, is to have a cleaner
    > interface wherein the client of the block device uses a two-stage
    > process to submit requests.
    > Firstly it says:
    > I want to do IO at this location, what is the max number of sectors
    > allowed?
    > Then it adds pages to the bio upto that limit.
    > Finally it say
    > OK, here is the request.
    >
    > The first and final stages have to be properly paired so that a
    > device knows if there are any pending requests and can hold-off any
    > device reconfiguration until all pending requests have completed.

    This is exactly what I'd like to do. The merge_bvec_fn is unusable by
    dm (and probably md) because this function is mapping specific - so
    dm_suspend/dm_resume need to be lifted above it.

    - Joe
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