Messages in this thread | | | Date | Tue, 3 Sep 2002 18:23:02 +0200 | From | Lars Marowsky-Bree <> | Subject | Re: [RFC] mount flag "direct" |
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On 2002-09-03T17:44:10, "Peter T. Breuer" <ptb@it.uc3m.es> said:
> No! I do not want /A/ fs, but /any/ fs, and I want to add the vfs > support necessary :-). > > That's really what my question is driving at. I see that I need to > make VFS ops communicate "tag requests" to the block layer, in > order to implement locking. Now you and Rik have pointed out one > operation that needs locking. My next question is obviously: can you > point me more or less precisely at this operation in the VFS layer? > I've only started studying it and I am relatively unfamiliar with it.
Your approach is not feasible.
Distributed filesystems have a lot of subtle pitfalls - locking, cache coherency, journal replay to name a few - which you can hardly solve at the VFS layer.
Good reading would be any sort of entry literature on clustering, I would recommend "In search of clusters" and many of the whitepapers Google will turn up for you, as well as the OpenGFS source.
Sincerely, Lars Marowsky-Brée <lmb@suse.de>
-- Immortality is an adequate definition of high availability for me. --- Gregory F. Pfister
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