Christoph Hellwig wrote:
We can have a simpler variant as a start if we really want. But we
need to pass it through the mtd layer. There is a reason we have this
thing called devices drivers, and we don't want to add knowledge of
ioremap to the filesystems and have users find out physical addresses
of their flash to pass it as mount option.
I see your poing with regard to layering, and I agree to it.
In order to do ioremap/iounmap at least we need a counterpart
put_xip_page thing to do iounmap in that path. Our dcss segments on
390 did not raise that requirement: they had a permanent kernel mapping.
The quiz question to me is: why don't we establish a permanenet
mapping of the entire thing from mount() to unmount(). That eliminates
the need to do iomap/iounmap, eliminates the need to have
put_xip_page, and eliminates to care about what layer would do this.
Would work for cramfs, won't work for read+write flash filesystems.
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