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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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