[BIO] request->flags ambiguity

From: Samium Gromoff (deepfire@ibe.miee.ru)
Date: Fri Jun 27 2003 - 04:47:56 EST


        I might just be completely off base, but something struck me lately as odd, and i`d
        like to hear what you folks think about the issue.

        I`m wondering about the ambiguity of the struct request->flags field.

        Is it ok to have a possibility of a request with conflicting meanings attached to it?
        For example REQ_CMD | REQ_PM_SHUTDOWN | REQ_SPECIAL.

        It may be, depending on the implementation, that they are not completely
        conflicting, but its hard to believe that there is zero ambiguity at all.

        If i`m not mistaken this looks as creating opportunities for various subtle bugs.

        Shouldn`t it make more sense to separate request-type-indicator flags
        into a separate unambiguous type field, which would take
        one of the following values:
                - read/write request
                - sense query
                - power control
                - special request

        And not a currently possible combination of all of them, which seem to be the
        current situation.

-- 
regards, Samium Gromoff
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