linux-ext4 - RE: [PATCH V2 2/7] Cleancache (was Transcendent Memory): core files

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Date:	Wed, 9 Jun 2010 20:28:21 -0700 (PDT)
From:	Dan Magenheimer <dan.magenheimer@...cle.com>
To:	ngupta@...are.org
Cc:	chris.mason@...cle.com, viro@...iv.linux.org.uk,
	akpm@...ux-foundation.org, adilger@....com, tytso@....edu,
	mfasheh@...e.com, joel.becker@...cle.com, matthew@....cx,
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	ocfs2-devel@....oracle.com, linux-mm@...ck.org, jeremy@...p.org,
	JBeulich@...ell.com, kurt.hackel@...cle.com, npiggin@...e.de,
	dave.mccracken@...cle.com, riel@...hat.com, avi@...hat.com,
	konrad.wilk@...cle.com
Subject: RE: [PATCH V2 2/7] Cleancache (was Transcendent Memory): core files

> I just finished a rough (but working) implementation of in-kernel
> page cache compression backend (called zcache). During this work,
> I found some issues with cleancache, mostly related to (lack of)
> comments/documentation:

Great to hear!  And excellent feedback on the missing
documentation... I am working on this right now so your
feedback is very timely.

(documentation and funcition return values comments deleted
as I will fix all of them)

> > +
> > +static inline int cleancache_init_fs(size_t pagesize)
> > +
> 
>  - It seems that returning pool_id of 0 is considered as error
> condition (as it appears from deactivate_locked_super() changes).
> This seems weird; I think only negative pool_id should considered
> as error. Anyway, please add function comments for these.

Hmmm... this is a bug.  0 is a valid pool_id.  I'll fix it
for the next rev.

> Page cache compression was a long-pending project. I'm glad its
> coming into shape with the help of cleancache :)

Thanks!
Dan
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