Re: [RFC/PATCH 0/2] ext4: Transparent Decompression Support

From: JÃrn Engel
Date: Thu Jul 25 2013 - 16:18:54 EST

On Thu, 25 July 2013 13:09:39 -0700, Zach Brown wrote:
> > > What about introducing a new flag, O_COMPR which tells the
> > > kernel, btw, we want this file to be decompressed if it can be. It
> > > can fallback to O_RDONLY or something like that? That gets rid of
> > > the chattr ugliness.
> >
> > How is that different from chattr ugliness, which also comes down to a
> > single flag? ;)
> It's much worse because it's per fd instead of per inode.
> The page cache, where the undisclosed complexity of this proposal lurks,
> where compressed and uncompressed cached copies of the data need to be
> managed somehow, is per inode.

You've been giving it away! Bad Zach, no cookies tonight.


With a PC, I always felt limited by the software available. On Unix,
I am limited only by my knowledge.
-- Peter J. Schoenster
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