Re: [f2fs-dev] [PATCH 0/1] userspace support for F2FS metadata encryption

[Satya Tangirala via Linux-f2fs-devel <linux-f2fs-devel@lists.sourceforge.net>]

On Thu, Dec 17, 2020 at 08:23:18AM -0800, Jaegeuk Kim wrote:
> Hi Satya,
> 
> Could you please consider to rebase the patches on f2fs-tools/dev branch?
> I've applied compression support which will have some conflicts with this
> series. And, could you check this works with multi-partition support?
> 
Sure, I'll do that! I sent out v2 of this patch series earlier today,
so would you want me to send out a rebased version asap? or when
I send out v3?

Also, newbie question - multi-partition support is the same as
multi-device support, right?
> Thanks,
> 
> On 10/05, Satya Tangirala wrote:
> > The kernel patches for F2FS metadata encryption are at:
> > 
> > https://lore.kernel.org/linux-fscrypt/20201005073606.1949772-4-satyat@google.com/
> > 
> > This patch implements the userspace changes required for metadata
> > encryption support as implemented in the kernel changes above. All blocks
> > in the filesystem are encrypted with the user provided metadata encryption
> > key except for the superblock (and its redundant copy). The DUN for a block
> > is its offset from the start of the filesystem.
> > 
> > This patch introduces two new options for the userspace tools: '-A' to
> > specify the encryption algorithm, and '-M' to specify the encryption key.
> > mkfs.f2fs will store the encryption algorithm used for metadata encryption
> > in the superblock itself, so '-A' is only applicable to mkfs.f2fs. The rest
> > of the tools only take the '-M' option, and will obtain the encryption
> > algorithm from the superblock of the FS.
> > 
> > Limitations: 
> > Metadata encryption with sparse storage has not been implemented yet in
> > this patch.
> > 
> > This patch requires the metadata encryption key to be readable from
> > userspace, and does not ensure that it is zeroed before the program exits
> > for any reason.
> > 
> > Satya Tangirala (1):
> >   f2fs-tools: Introduce metadata encryption support
> > 
> >  fsck/main.c                   |  47 ++++++-
> >  fsck/mount.c                  |  33 ++++-
> >  include/f2fs_fs.h             |  10 +-
> >  include/f2fs_metadata_crypt.h |  21 ++++
> >  lib/Makefile.am               |   4 +-
> >  lib/f2fs_metadata_crypt.c     | 226 ++++++++++++++++++++++++++++++++++
> >  lib/libf2fs_io.c              |  87 +++++++++++--
> >  mkfs/f2fs_format.c            |   5 +-
> >  mkfs/f2fs_format_main.c       |  33 ++++-
> >  9 files changed, 446 insertions(+), 20 deletions(-)
> >  create mode 100644 include/f2fs_metadata_crypt.h
> >  create mode 100644 lib/f2fs_metadata_crypt.c
> > 
> > -- 
> > 2.28.0.806.g8561365e88-goog


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