[PATCH V4 0/9] Remove fs specific fscrypt and fsverity build config options

[Chandan Rajendra <chandan@linux.vnet.ibm.com>]

In order to have a common code base for fscrypt & fsverity "post read"
processing across filesystems which implement fscrypt/fsverity, this
commit removes filesystem specific build config option
(CONFIG_EXT4_FS_ENCRYPTION, CONFIG_EXT4_FS_VERITY,
CONFIG_F2FS_FS_ENCRYPTION, CONFIG_F2FS_FS_VERITY and
CONFIG_UBIFS_FS_ENCRYPTION) and replaces it with build options
(CONFIG_FS_ENCRYPTION and CONFIG_FS_VERITY) whose values affect all
the filesystems making use of fscrypt and fsverity.

The Kconfig recursive dependency issue reported by kbuild test bot for
IA64 architecture still needs to be fixed. I should be able to fix the
problem and post the next verison of patches by today.

PS: Since I have access to only to x86 and ppc64le machines, I haven't tested the
defconfig files for other architectures.

Changelog:
V3 -> V4:
1. For non-fsverity supported kernels, return success when fsverity_file_open()
   is invoked for non-fsverity files.

V2 -> V3:
1. Remove unnecessary line breaks.
2. Remove the definition of f2fs_encrypted_inode().
3. Fix Kconfig dependencies for fscrypt w.r.t F2FS and UBIFS. If F2FS is enabled
   in the kernel build configuration, F2FS_FS_XATTR is selected if FS_ENCRYPTION
   is enabled. Similarly, if UBIFS is enabled in the kernel build configuration,
   UBIFS_FS_XATTR and BLOCK is selected if FS_ENCRYPTION is enabled.
4. Two new patches have been added to move verity status check to
   fsverity_file_open() and fsverity_prepare_setattr().
5. For patch "f2fs: use IS_VERITY() to check inode's fsverity status", the
   acked-by tag given by Chao Yu has been removed since I added an invocation to
   f2fs_set_inode_flags() inside f2fs_set_verity(). This is needed to have
   S_VERITY flag set on the corresponding VFS inode.

V1 -> V2:
1. Address the following review comments provided by Eric Biggers,
   - In ext4_should_use_dax(), Use ext4_test_inode_flag() to check for
     fscrypt/fsverity status of an inode.
   - Update documentation associated with fscrypt & fsverity to refer to
     CONFIG_FS_ENCRYPTION and CONFIG_FS_VERITY build flags.
   - Remove filesystem specific fscrypt build configuration from defconfig
     files.
   - Provide a list of supported filesystems for CONFIG_FS_ENCRYPTION and
     CONFIG_FS_VERITY build flags.
   - Update comment describing S_VERITY flag.
2. Remove UBIFS specific encryption build option and make use of the generic
   CONFIG_FS_ENCRYPTION flag.

RFC -> V1:
1. Add a new patch to implement S_VERITY/IS_VERITY().
2. Split code that replaces filesystem specific routines with generic
   IS_ENCRYPTED() and IS_VERITY() calls into separate patches.

Chandan Rajendra (9):
  ext4: use IS_ENCRYPTED() to check encryption status
  f2fs: use IS_ENCRYPTED() to check encryption status
  fscrypt: remove filesystem specific build config option
  Add S_VERITY and IS_VERITY()
  ext4: use IS_VERITY() to check inode's fsverity status
  f2fs: use IS_VERITY() to check inode's fsverity status
  fsverity: Remove filesystem specific build config option
  fsverity: Move verity status check to fsverity_file_open
  fsverity: Move verity status check to fsverity_prepare_setattr

 Documentation/filesystems/fscrypt.rst   |   4 +-
 Documentation/filesystems/fsverity.rst  |   4 +-
 arch/mips/configs/generic_defconfig     |   2 +-
 arch/nds32/configs/defconfig            |   2 +-
 arch/s390/configs/debug_defconfig       |   2 +-
 arch/s390/configs/performance_defconfig |   2 +-
 fs/crypto/Kconfig                       |   5 +-
 fs/crypto/fscrypt_private.h             |   1 -
 fs/ext4/Kconfig                         |  35 --
 fs/ext4/dir.c                           |  10 +-
 fs/ext4/ext4.h                          |  23 +-
 fs/ext4/ext4_jbd2.h                     |   2 +-
 fs/ext4/extents.c                       |   4 +-
 fs/ext4/file.c                          |   8 +-
 fs/ext4/ialloc.c                        |   2 +-
 fs/ext4/inode.c                         |  40 ++-
 fs/ext4/ioctl.c                         |   4 +-
 fs/ext4/move_extent.c                   |   3 +-
 fs/ext4/namei.c                         |  18 +-
 fs/ext4/page-io.c                       |   9 +-
 fs/ext4/readpage.c                      |  10 +-
 fs/ext4/super.c                         |  13 +-
 fs/ext4/sysfs.c                         |   8 +-
 fs/f2fs/Kconfig                         |  32 +-
 fs/f2fs/data.c                          |   6 +-
 fs/f2fs/dir.c                           |  10 +-
 fs/f2fs/f2fs.h                          |  23 +-
 fs/f2fs/file.c                          |  28 +-
 fs/f2fs/inode.c                         |   8 +-
 fs/f2fs/namei.c                         |   6 +-
 fs/f2fs/super.c                         |  15 +-
 fs/f2fs/sysfs.c                         |   8 +-
 fs/ubifs/Kconfig                        |  13 +-
 fs/ubifs/Makefile                       |   2 +-
 fs/ubifs/ioctl.c                        |   4 +-
 fs/ubifs/sb.c                           |   2 +-
 fs/ubifs/super.c                        |   2 +-
 fs/ubifs/ubifs.h                        |   5 +-
 fs/verity/Kconfig                       |   3 +-
 fs/verity/fsverity_private.h            |   1 -
 fs/verity/setup.c                       |   5 +-
 include/linux/fs.h                      |  10 +-
 include/linux/fscrypt.h                 | 416 +++++++++++++++++++++++-
 include/linux/fscrypt_notsupp.h         | 231 -------------
 include/linux/fscrypt_supp.h            | 204 ------------
 include/linux/fsverity.h                |  17 +-
 46 files changed, 562 insertions(+), 700 deletions(-)
 delete mode 100644 include/linux/fscrypt_notsupp.h
 delete mode 100644 include/linux/fscrypt_supp.h

-- 
2.19.1