Jeff
Gerard Roudier wrote:
>
> On Mon, 1 Nov 1999, Andrea Arcangeli wrote:
>
> > On Mon, 1 Nov 1999, Gerard Roudier wrote:
> >
> > >I can understand that (1) perhaps allows to implement some features not
> > >possible with the layering used in Linux, at the price of increasing FS
> > >complexity probably.
> >
> > Agreed. This because at the blockdevice layer you lost all the semantics
> > of the data and so at the ll_rw_block layer you can't implement any clever
> > algorithm in order to relocate the data on optimal physical locations.
>
> I am not sure that implementing mirroring (or RAID) with File System
> interactions was the way to go given the number of File Systems supported
> by Linux (in fact the current approach looks just fine to me). But I have
> no objection about some FS controlling this feature by itself. Result is
> indeed that this FS layer gets more complex.
>
> May-be the block device layer should be moved to block peripheral drivers,
> but I donnot see in what this will significantly change the semantic about
> data from the FS layer.
>
> Gérard.
>
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