actually bh_new is needed also to serialize with the buffercache, a new
bh mapped in pagecache must be dropped from the buffercache before we
can start using it (unmap_underlying_metadata).
so at least for 2.4 I wouldn't drop it :)
>
> However, I don't think it was ever implemented, so if you prefer the
> straightforward (brute-force but ugly) approach, just get rid of it.
>
> Linus
Andrea
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