[PATCH v2 0/6] fscrypt: Switch to sync_skcipher and on-stack requests

[Eric Biggers]

Simplify the code and eliminate per-encryption-op dynamic memory
allocations by switching from crypto_skcipher to crypto_sync_skcipher,
and from dynamic request allocation to SYNC_SKCIPHER_REQUEST_ON_STACK.

Previously, this change would have made the x86 accelerated AES code no
longer be used, which would have been very bad.  However, I fixed that
in 6.16.  So we can make this simplification now.

This patchset applies to fscrypt/for-next.  The base-commit (listed
below) can be found in next-20250708

Changed in v2:
- Added patches that remove the gfp_t argument from functions that no
  longer need it.
- Eliminated the goto in derive_key_aes().
- Improved commit messages.

Eric Biggers (6):
  fscrypt: Don't use asynchronous CryptoAPI algorithms
  fscrypt: Drop FORBID_WEAK_KEYS flag for AES-ECB
  fscrypt: Switch to sync_skcipher and on-stack requests
  fscrypt: Remove gfp_t argument from fscrypt_crypt_data_unit()
  fscrypt: Remove gfp_t argument from fscrypt_encrypt_block_inplace()
  ceph: Remove gfp_t argument from ceph_fscrypt_encrypt_*()

 fs/ceph/crypto.c            | 13 +++-----
 fs/ceph/crypto.h            | 10 +++---
 fs/ceph/file.c              |  3 +-
 fs/ceph/inode.c             |  3 +-
 fs/crypto/bio.c             |  3 +-
 fs/crypto/crypto.c          | 44 +++++++++-----------------
 fs/crypto/fname.c           | 63 +++++++++++++------------------------
 fs/crypto/fscrypt_private.h | 10 +++---
 fs/crypto/keysetup.c        | 23 +++++++-------
 fs/crypto/keysetup_v1.c     | 56 ++++++++++++++-------------------
 fs/ubifs/crypto.c           |  2 +-
 include/linux/fscrypt.h     |  5 ++-
 12 files changed, 91 insertions(+), 144 deletions(-)


base-commit: b41c1d8d07906786c60893980d52688f31d114a6
-- 
2.50.1