what happened to mark_buffer_protected()

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Nice function. Used to use it. 2.4.8. 2.4.12-going-on-13 and it's no
longer there. No BH_Protected field in the bh either.

OK, so how do I stop buffers being reclaimed now? My intention
is to keep the buffer hanging around forever once I have written to it,
so that further reads to that block of my device return the buffer
content without ever getting to my device (that's right, write-once,
read-many).

He's off to read the ramdisk code, tara, tarum, tara ...

Peter
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