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

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


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

[Akira Hayakawa]

Hi Peter,

Just curious.

Are you looking for device-mapper in userland like FUSE?

Akira

On 2016/08/04 6:46, Peter Desnoyers wrote:
> 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,
> .....................................................................
>  Peter Desnoyers                                  pjd@ccs.neu.edu
>  Northeastern Computer & Information Science      (617) 373-8683
> 
> 
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel
> 

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