> I think this is a result of the "blockdev in pagecache" change added in
> 2.4.10. One of the byproducts of this change is that if a block device
> is closed (no other openers) then all of the pages from this device are
> dropped from the cache. In the case of a floppy drive, this is very
> important, as you don't want to be cacheing data from one floppy after
> you have inserted a new floppy.
RTFS. That _exactly_ matches the behaviour of buffer-cache variant.
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