Hello, 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 (https://lkml.kernel.org/linux-fsdevel/20190821075714.65140-1-satyat@xxxxxxxxxx/) 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 https://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux.git/log/?h=inline-crypt-optimized-v2 I've written a ciphertext verification test for this new type of policy: https://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/xfstests-dev.git/log/?h=inline-encryption Work-in-progress patches for the inline encryption implementation of both IV_INO_LBLK_64 and regular policies can be found at https://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux.git/log/?h=inline-encryption-wip 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(-) -- 2.24.0.rc0.303.g954a862665-goog
