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Date:   Thu, 24 Oct 2019 14:54:35 -0700
From:   Eric Biggers <>
Cc:,,, Satya Tangirala <>,
        Paul Crowley <>,
        Paul Lawrence <>,
        "Theodore Y . Ts'o" <>,
        Jaegeuk Kim <>
Subject: [PATCH v2 0/3] fscrypt: support for IV_INO_LBLK_64 policies


In preparation for adding inline encryption support to fscrypt, this
patchset adds a new fscrypt policy flag which modifies the encryption to
be optimized for inline encryption hardware compliant with the UFS v2.1
standard or the upcoming version of the eMMC standard.

This means using per-mode keys instead of per-file keys, and in
compensation including the inode number in the IVs.  For ext4, this
precludes filesystem shrinking, so I've also added a compat feature
which will prevent the filesystem from being shrunk.

I've separated this from the full "Inline Encryption Support" patchset
to avoid conflating an implementation (inline encryption) with a new
on-disk format (IV_INO_LBLK_64).  This patchset purely adds support for
IV_INO_LBLK_64 policies to fscrypt, but implements them using the
existing filesystem layer crypto.

We're planning to make the *implementation* (filesystem layer or inline
crypto) be controlled by a mount option '-o inlinecrypt'.

This patchset applies to fscrypt.git#master and can also be retrieved from

I've written a ciphertext verification test for this new type of policy:

Work-in-progress patches for the inline encryption implementation of
both IV_INO_LBLK_64 and regular policies can be found at

Changes v1 => v2:

- Rename the flag from INLINE_CRYPT_OPTIMIZED to IV_INO_LBLK_64.

- Use the same key derivation and IV generation scheme for filenames
  encryption too.

- Improve the documentation and commit messages.

Eric Biggers (3):
  fscrypt: add support for IV_INO_LBLK_64 policies
  ext4: add support for IV_INO_LBLK_64 encryption policies
  f2fs: add support for IV_INO_LBLK_64 encryption policies

 Documentation/filesystems/fscrypt.rst | 63 +++++++++++++++++----------
 fs/crypto/crypto.c                    | 10 ++++-
 fs/crypto/fscrypt_private.h           | 16 +++++--
 fs/crypto/keyring.c                   |  6 ++-
 fs/crypto/keysetup.c                  | 45 ++++++++++++++-----
 fs/crypto/policy.c                    | 41 ++++++++++++++++-
 fs/ext4/ext4.h                        |  2 +
 fs/ext4/super.c                       | 14 ++++++
 fs/f2fs/super.c                       | 26 ++++++++---
 include/linux/fscrypt.h               |  3 ++
 include/uapi/linux/fscrypt.h          |  3 +-
 11 files changed, 182 insertions(+), 47 deletions(-)


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