linux-kernel - Re: [PATCHSET] FUSE: extend FUSE to support more operations

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Message-Id: <E1L0CWu-0004Dk-F9@pomaz-ex.szeredi.hu>
Date:	Wed, 12 Nov 2008 11:00:56 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	tj@...nel.org
CC:	miklos@...redi.hu, fuse-devel@...ts.sourceforge.net,
	greg@...ah.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCHSET] FUSE: extend FUSE to support more operations

On Wed, 12 Nov 2008, Tejun Heo wrote:
> > Comments about the others:
> > 
> >   0002-FUSE-pass-nonblock-flag-to-client.patch
> > 
> > this is not needed, f_flags are already passed to userspace for read
> > and write.
> 
> Hmmm... I'll try to find out whether I can use f_flags.  There was
> something that prevented it from working properly.  I'll dig.

Support for this was missing from libfuse, but now I fixed that in the
CVS version.

> >   0004-FUSE-implement-direct-lseek-support.patch
> > 
> > this is trickier to get the interface right I think.  If we want to
> > allow filesystems to implement a custom lseek, then we also want them
> > to keep track of the file position, which means we must differentiate
> > between a write(2) and a pwrite(2) and similarly for reads.  AFAICS
> > this isn't needed for CUSE so we can leave this to later.
> 
> Read/write already passes @offset, so the only thing required is an
> extra flag there.  I mainly wanted a way for a CUSE server to veto lseek
> with proper error and still think it's better to have this as we don't
> really know what wacky users are out there.  What do you think about an
> extra flag?

OK, but that's gonna involve a fair bit of API churn, and I'm not sure
it's worth it at this stage.  If this is not needed for the OSS
emulation, I think we should postpone it.

Thanks,
Miklos
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