Re: silent semantic changes with reiser4

[Jamie Lokier]

Rik van Riel wrote:
> > All of which can be handled in userspace library code.
> > 
> > What compelling reason is there for doing this in the kernel?
> 
> There's a compelling reason to do it in userspace.  If an
> unaware program copies or moves such a file with streams
> inside, it doesn't break the streams and aware programs will
> continue to see them.
> 
> OTOH, if we had the streams in the kernel, unaware applications
> would continuously break the metadata and streams that the
> streams aware programs expect !

You appear not to have read any of my mails on this topic.

Properly implemented metadata can:

  (1) operate in both modes simultaneously;
  (2) work with unaware applications;
  (3) provide performance enhancements to aware applications;
  (4) provide storage enhancements to both;
  (5) provide useful features that work with standard unmodified unix tools,

all at once.  That includes program copies.

-- Jamie
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