linux-ext4 - [LFS/MM TOPIC] fs reflink issues, fs online scrub/check, etc

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Message-ID: <20160210191848.GC6346@birch.djwong.org>
Date:	Wed, 10 Feb 2016 11:18:48 -0800
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	lsf-pc@...ts.linux-foundation.org
Cc:	xfs <xfs@....sgi.com>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-ext4 <linux-ext4@...r.kernel.org>,
	linux-btrfs <linux-btrfs@...r.kernel.org>,
	ocfs2-devel@....oracle.com
Subject: [LFS/MM TOPIC] fs reflink issues, fs online scrub/check, etc

[resend, email exploded, sorry...]

Hi,

I want to discuss a few FS related topics that I haven't already seen on
the mailing lists:

 * Shared pagecache pages for reflinked files (and by extension making dax
   work with reflink on xfs)

 * Providing a simple interface for scrubbing filesystem metadata in the
   background (the online check thing).  Ideally we'd make it easy to discover
   what kind of metadata there is to check and provide a simple interface to
   check the metadata, once discovered.  This is a tricky interface topic
   since FS design differs pretty widely.

 * Rudimentary online repair and rebuilding (xfs) from secondary metadata

 * Working out the variances in the btrfs/xfs/ocfs2/nfs reflink implementations
   and making sure they all get test coverage

I would also like participate in some of the proposed discussions:

 * The ext4 summit (and whatever meeting of XFS devs may happen)

 * Integrating existing filesystems into pmem, or hallway bofs about designing
   new filesystems for pmem

 * Actually seeing the fs developers (well, everyone!) in person again :)

--Darrick
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