[PATCH v3 0/4] Inline Encryption Support for fscrypt

[Satya Tangirala <satyat@google.com>]

This patch series adds support for Inline Encryption to fscrypt, f2fs
and ext4. It builds on the inline encryption support now present in
the block layer, and has been rebased on v5.8-rc3.

This patch series previously went though a number of iterations as part
of the "Inline Encryption Support" patchset (last version was v13:
https://lkml.kernel.org/r/20200514003727.69001-1-satyat@google.com).

Patch 1 introduces the SB_INLINECRYPT sb options, which filesystems
should set if they want to use blk-crypto for file content en/decryption.

Patch 2 adds inline encryption support to fscrypt. To use inline
encryption with fscrypt, the filesystem must set the above mentioned
SB_INLINECRYPT sb option. When this option is set, the contents of
encrypted files will be en/decrypted using blk-crypto.

Patches 3 and 4 wire up f2fs and ext4 respectively to fscrypt support for
inline encryption, and e.g ensure that bios are submitted with blocks
that not only are contiguous, but also have continuous DUNs.

This patchset was tested by running xfstests with the "inlinecrypt" mount
option on ext4 and f2fs with test dummy encryption (the actual
en/decryption of file contents was handled by the blk-crypto-fallback). It
was also tested along with the UFS patches from the original series on some
Qualcomm and Mediatek chipsets with hardware inline encryption support
(refer to
https://lkml.kernel.org/linux-scsi/20200501045111.665881-1-ebiggers@kernel.org/
and
https://lkml.kernel.org/linux-scsi/20200304022101.14165-1-stanley.chu@mediatek.com/
for more details on those tests).

Changes v2 => v3
 - Fix issue with inline encryption + IV_INO_LBLK_32 policy found by Eric
 - minor cleanup

Changes v1 => v2
 - SB_INLINECRYPT mount option is shown by individual filesystems instead
   of by the common VFS code since the option is parsed by filesystem
   specific code, and is not a mount option applicable generically to
   all filesystems.
 - Make fscrypt_select_encryption_impl() return error code when it fails
   to allocate memory.
 - cleanups
 
Changes v13 in original patchset => v1
 - rename struct fscrypt_info::ci_key to ci_enc_key
 - set dun bytes more precisely in fscrypt
 - cleanups

Eric Biggers (1):
  ext4: add inline encryption support

Satya Tangirala (3):
  fs: introduce SB_INLINECRYPT
  fscrypt: add inline encryption support
  f2fs: add inline encryption support

 Documentation/admin-guide/ext4.rst    |   7 +
 Documentation/filesystems/f2fs.rst    |   7 +
 Documentation/filesystems/fscrypt.rst |   3 +
 fs/buffer.c                           |   7 +-
 fs/crypto/Kconfig                     |   6 +
 fs/crypto/Makefile                    |   1 +
 fs/crypto/bio.c                       |  51 ++++
 fs/crypto/crypto.c                    |   2 +-
 fs/crypto/fname.c                     |   4 +-
 fs/crypto/fscrypt_private.h           | 115 +++++++-
 fs/crypto/inline_crypt.c              | 364 ++++++++++++++++++++++++++
 fs/crypto/keyring.c                   |   6 +-
 fs/crypto/keysetup.c                  |  70 +++--
 fs/crypto/keysetup_v1.c               |  16 +-
 fs/ext4/inode.c                       |   4 +-
 fs/ext4/page-io.c                     |   6 +-
 fs/ext4/readpage.c                    |  11 +-
 fs/ext4/super.c                       |  12 +
 fs/f2fs/compress.c                    |   2 +-
 fs/f2fs/data.c                        |  78 +++++-
 fs/f2fs/super.c                       |  35 +++
 include/linux/fs.h                    |   1 +
 include/linux/fscrypt.h               |  82 ++++++
 23 files changed, 819 insertions(+), 71 deletions(-)
 create mode 100644 fs/crypto/inline_crypt.c

-- 
2.27.0.212.ge8ba1cc988-goog