>>> You mean define a FS-specific structure and point generic_ip to it?
>>
>> Yes. Or, if the FS-specific field is small enough, then just make it
>> part of the union of FS-specific stuff.
>
> Fine. Actually, one day I hope to see the union blown away and every
> FS just write a pointer.
Not without benchmarks I hope! You get double the number of memory
allocations, most likely increased memory usage, and the extra
overhead (register pressure and memory access?) of indirection.
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