multiple pending filesystem requests for the same block ?
Luigi Rizzo
rizzo at icir.org
Tue Jul 26 13:54:45 GMT 2005
(context: SoC work on pluggable disk schedulers,
http://wikitest.freebsd.org/moin.cgi/Hybrid
The doubt we have is the following:
can the filesystem code have multiple pending write requests for
the same disk block ?
the current (elevator) disk scheduler should have no problem with
this, because even if disksort reorders requests, two requests
for the same block retain the issue ordering.
However we wonder if this feature is actually expected by
the filesystem code, or it does not matter because it
never issues a new request before the previous one on the
same area is complete.
thanks
luigi
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