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

[Jaegeuk Kim <jaegeuk@kernel.org>]

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?

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