linux-kernel - Re: [fuse-devel] [PATCHSET] CUSE: implement CUSE

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Date:	Sat, 30 Aug 2008 14:30:32 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Archie Cobbs <archie@...lroad.org>
CC:	Mike Hommey <mh@...ndium.org>, fuse-devel@...ts.sourceforge.net,
	greg@...ah.com, linux-kernel@...r.kernel.org, miklos@...redi.hu
Subject: Re: [fuse-devel] [PATCHSET] CUSE: implement CUSE

Hello,

Archie Cobbs wrote:
>> Thought about that but it's really no different from nbd or loop
>> depending on your application and block devices don't really implement
>> the file operations so it won't have too much in common with FUSE.
> 
> I think BUSE would be useful. For one, it allows you to avoid problems with
> the extra caching you get with a loopback device. And NBD is too limiting
> for some applications.
> 
> For my half-ignorant analysis of the caching issues, see:
>   http://code.google.com/p/s3backer/wiki/PerformanceConsiderations#Caching
> 
> This is also an example of an application where NBD doesn't suffice.
> 
>> Also, there's the complication of going out to disk for more memory cases.
> 
> Not sure what you mean exactly (my fault), but it seems BUSE would have fewer
> places for memory problems (including deadlocks) than loopback over FUSE,
> which is the only way to do this kind of stuff now.

Yeah, compared to loopback over FUSE, anything would have less
problem. :-) I don't know much about nbd but it's pretty much solving
the same problem so I think it's logical to extend nbd including
giving it a new transport if necessary?  Or is there something
fundamentally better when it's done via FUSE?

Thanks.

-- 
tejun
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