once block_dev is in pagecache there will obviously be no-way to
share cache between the block device and the filesystem, because
all the caches will be in completly different address spaces.
Once we are at this point... will there be any use in having block
devices? FreeBSD appears to have done without them completely about a
year ago (an observation, not a comment on whether this is a good
idea or not).
--cw
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