Date: Tue, 26 Jul 2005 06:54:44 -0700 From: Luigi Rizzo <rizzo@icir.org> To: current@freebsd.org Cc: s223560@studenti.ing.unipi.it Subject: multiple pending filesystem requests for the same block ? Message-ID: <20050726065444.A37735@xorpc.icir.org>
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(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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