[dm-devel] [high-level] user-space access to dm target?

[Peter Desnoyers]

We’re developing an SMR translation layer in a device mapper target, and we’d like to keep a lot of the complexity (recovery at startup, parts of the garbage collection algorithm) in user space.

I was wondering what people’s thoughts are on the best strategy for the user/kernel interface here?

We’re currently doing something quite gross - using a /proc file with a simple protocol based on reading and writing fixed-sized binary messages. For our purposes this works fairly well, but clearly we need something cleaner if we want this to go anywhere.

Thanks,
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 Peter Desnoyers                                  pjd at ccs.neu.edu
 Northeastern Computer & Information Science      (617) 373-8683