linux-kernel - Re: [PATCH v2 0/3] add support for metadata encryption to F2FS

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Message-ID: <X9vyM0jb91Q7aBJW@google.com>
Date:   Fri, 18 Dec 2020 00:05:07 +0000
From:   Satya Tangirala <satyat@...gle.com>
To:     "Theodore Y. Ts'o" <tytso@....edu>
Cc:     Jaegeuk Kim <jaegeuk@...nel.org>,
        Eric Biggers <ebiggers@...nel.org>, Chao Yu <chao@...nel.org>,
        linux-kernel@...r.kernel.org, linux-fscrypt@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [PATCH v2 0/3] add support for metadata encryption to F2FS

On Thu, Dec 17, 2020 at 06:34:27PM -0500, Theodore Y. Ts'o wrote:
> On Thu, Dec 17, 2020 at 08:51:14PM +0000, Satya Tangirala wrote:
> > On Thu, Dec 17, 2020 at 01:08:49PM -0500, Theodore Y. Ts'o wrote:
> > > On Thu, Dec 17, 2020 at 03:04:32PM +0000, Satya Tangirala wrote:
> > > > This patch series adds support for metadata encryption to F2FS using
> > > > blk-crypto.
> > > 
> > > Is there a companion patch series needed so that f2fstools can
> > > check/repair a file system with metadata encryption enabled?
> > > 
> > > 	       	    	   	- Ted
> > Yes! It's at
> > https://lore.kernel.org/linux-f2fs-devel/20201217151013.1513045-1-satyat@google.com/
> 
> Cool, I've been meaning to update f2fs-tools in Debian, and including
> these patches will allow us to generate {kvm,gce,android}-xfstests
> images with this support.  I'm hoping to get to it sometime betweeen
> Christmas and New Year's.
> 
> I guess there will need to be some additional work needed to create
> the f2fs image with a fixed keys for a particular file system in
> xfstests-bld, and then mounting and checking said image with the
> appropriatre keys as well.   Is that something you've put together?
> 
I did put something together that sets up metadata encryption on the disks
used by kvm-xfstests. The main code changes were to add a fixed
metadata encryption key with keyctl, and export MKFS_OPTIONS with the
metadata encryption options.

The mkfs options are the only options that need direct modification because
the rest of the tools (fsck/dump etc.) automatically do the right thing if
the FS superblock has the metadata encryption options. But the rest of the
tools do need the metadata encryption key to be present, and some
xfstests/other parts of the harness code clear the keyrings directly, so I
had a few more hacky changes to re-add the keys when they're cleared.
Some more hacky changes were needed because some xfstests override
MKFS_OPTIONS. I'll be happy to send what I have to you/put it up somewhere.
I'll also try to clean up the code a little, but my knowledge of xfstests
is definitely limited so it might take a little while.
> Cheers,
> 
> 						- Ted