[PATCH 00/13] fscrypt, ext4: prepare for blocksize != PAGE_SIZE

[Eric Biggers <ebiggers@kernel.org>]

Hello,

This patch series prepares fs/crypto/, and partially ext4, for the
'blocksize != PAGE_SIZE' case.

This basically contains the encryption changes from Chandan Rajendra's
patch series "[V2,00/13] Consolidate FS read I/O callbacks code"
(https://patchwork.kernel.org/project/linux-fscrypt/list/?series=111039)
that don't require introducing the read_callbacks and don't depend on
fsverity stuff.  But they've been reworked to clean things up a lot.

I propose that to move things forward for ext4 encryption with
'blocksize != PAGE_SIZE', we apply this series (or something similar) to
the fscrypt tree for 5.3 on its own merits.  Then the read_callbacks
series on top of it will much smaller and easier to review.

AFAIK, after this series the only thing stopping ext4 encryption from
working with blocksize != PAGE_SIZE is the lack of encryption support in
block_read_full_page(), which the read_callbacks will address.

This series applies to the fscrypt tree, and it can also be retrieved
from git at https://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux.git
branch "fscrypt-subpage-blocks-prep".

Chandan Rajendra (3):
  ext4: clear BH_Uptodate flag on decryption error
  ext4: decrypt only the needed blocks in ext4_block_write_begin()
  ext4: decrypt only the needed block in __ext4_block_zero_page_range()

Eric Biggers (10):
  fscrypt: simplify bounce page handling
  fscrypt: remove the "write" part of struct fscrypt_ctx
  fscrypt: rename fscrypt_do_page_crypto() to fscrypt_crypt_block()
  fscrypt: clean up some BUG_ON()s in block encryption/decryption
  fscrypt: introduce fscrypt_encrypt_block_inplace()
  fscrypt: support encrypting multiple filesystem blocks per page
  fscrypt: handle blocksize < PAGE_SIZE in fscrypt_zeroout_range()
  fscrypt: introduce fscrypt_decrypt_block_inplace()
  fscrypt: support decrypting multiple filesystem blocks per page
  ext4: encrypt only up to last block in ext4_bio_write_page()

 fs/crypto/bio.c             |  73 +++------
 fs/crypto/crypto.c          | 299 ++++++++++++++++++++----------------
 fs/crypto/fscrypt_private.h |  14 +-
 fs/ext4/inode.c             |  35 +++--
 fs/ext4/page-io.c           |  44 +++---
 fs/f2fs/data.c              |  17 +-
 fs/ubifs/crypto.c           |  19 +--
 include/linux/fscrypt.h     |  96 ++++++++----
 8 files changed, 319 insertions(+), 278 deletions(-)

-- 
2.21.0.593.g511ec345e18-goog