Date: Sat, 9 Aug 2008 16:37:33 -0400 From: John Baldwin <jhb@freebsd.org> To: arch@freebsd.org Subject: Make MOD_QUIESCE a bit more useful.. Message-ID: <200808091637.33820.jhb@freebsd.org>
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So currently the MOD_QUIESCE event is posted to a module when unloading a kld so it can veto non-forced unloads. However, the current implementation in the kernel linker is to run through all the modules in a file, posting MOD_QUIESCE followed by MOD_UNLOAD on each module serially. Thus, if you have multiple modules in a single kld and one of the modules veto's an unload request via MOD_QUIESCE, you don't know as the module author if any of your modules were unloaded via MOD_UNLOAD or not. I think a better approach would be to change the kernel linker to invoke MOD_QUIESCE on all modules in a single pass first. If none of those fail (or it's a forced unload), then it can do a second pass invoking MOD_UNLOAD on all the modules. -- John Baldwin
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