btrfs: add fscrypt support

Hello,

This is based on 

https://github.com/btrfs/linux.git for-next

which has the recent pull from the fscrypt tree.

I've reworked a lot of this to incorporate Eric's suggestions.  There are a few
more patches because of bugs I've found in testing, and I've disabled a few
features, namely RAID5/6 and send, as they will require more work to support
with encryption and that can be done after the core work is merged.

Thanks,

Josef

v4->v5:
- Addressed all the comments from Eric and then reworked the rest of the code to
  handle the various changes.
- Fixed read repair.
- Fixed log replay.
- Disabled send for encrypted file systems.
- Disabled turning on encryption on RAID5/6 file systems.

v3->v4:
- Added support for '-o test_dummy_encryption' at Eric's suggestion, this
  uncovered a load of issues.
- Preliminary work to support decrypting names for our various name resolution
  ioctls.  I didn't get everything but I got the ones we depend on in fstests.
- Preliminary work for send of an encrypted directory with the key loaded.
  There's probably still bugs in here, but it doesn't crash anymore.
- Fixed how we limit the bio size to work with direct and buffered io.
- Fixed using the wrong fscrypt extent context for writes into prealloc extents.

Josef Bacik (38):
  fscrypt: add per-extent encryption support
  fscrypt: allow inline encryption for extent based encryption
  fscrypt: add a fscrypt_inode_open helper
  fscrypt: conditionally don't wipe mk secret until the last active user
    is done
  blk-crypto: add a process bio callback
  fscrypt: add a process_bio hook to fscrypt_operations
  fscrypt: add documentation about extent encryption
  btrfs: add infrastructure for safe em freeing
  btrfs: select encryption dependencies if FS_ENCRYPTION
  btrfs: add fscrypt_info and encryption_type to ordered_extent
  btrfs: plumb through setting the fscrypt_info for ordered extents
  btrfs: plumb the fscrypt extent context through create_io_em
  btrfs: populate the ordered_extent with the fscrypt context
  btrfs: keep track of fscrypt info and orig_start for dio reads
  btrfs: add an optional encryption context to the end of file extents
  btrfs: pass through fscrypt_extent_info to the file extent helpers
  btrfs: implement the fscrypt extent encryption hooks
  btrfs: setup fscrypt_extent_info for new extents
  btrfs: populate ordered_extent with the orig offset
  btrfs: set the bio fscrypt context when applicable
  btrfs: add a bio argument to btrfs_csum_one_bio
  btrfs: add orig_logical to btrfs_bio
  btrfs: limit encrypted writes to 256 segments
  btrfs: implement process_bio cb for fscrypt
  btrfs: implement read repair for encryption
  btrfs: add test_dummy_encryption support
  btrfs: don't rewrite ret from inode_permission
  btrfs: move inode_to_path higher in backref.c
  btrfs: make btrfs_ref_to_path handle encrypted filenames
  btrfs: don't search back for dir inode item in INO_LOOKUP_USER
  btrfs: deal with encrypted symlinks in send
  btrfs: decrypt file names for send
  btrfs: load the inode context before sending writes
  btrfs: set the appropriate free space settings in reconfigure
  btrfs: support encryption with log replay
  btrfs: disable auto defrag on encrypted files
  btrfs: disable encryption on RAID5/6
  btrfs: disable send if we have encryption enabled

Omar Sandoval (7):
  fscrypt: expose fscrypt_nokey_name
  btrfs: disable various operations on encrypted inodes
  btrfs: start using fscrypt hooks
  btrfs: add inode encryption contexts
  btrfs: add new FEATURE_INCOMPAT_ENCRYPT flag
  btrfs: adapt readdir for encrypted and nokey names
  btrfs: implement fscrypt ioctls

Sweet Tea Dorminy (7):
  btrfs: disable verity on encrypted inodes
  btrfs: handle nokey names.
  btrfs: gate encryption behind BTRFS_DEBUG
  btrfs: add get_devices hook for fscrypt
  btrfs: set file extent encryption excplicitly
  btrfs: add fscrypt_info and encryption_type to extent_map
  btrfs: explicitly track file extent length for replace and drop

 Documentation/filesystems/fscrypt.rst |  41 ++
 block/blk-crypto-fallback.c           |  43 +++
 block/blk-crypto-internal.h           |   8 +
 block/blk-crypto-profile.c            |   2 +
 block/blk-crypto.c                    |   6 +-
 fs/btrfs/Kconfig                      |   3 +
 fs/btrfs/Makefile                     |   1 +
 fs/btrfs/accessors.h                  |  50 +++
 fs/btrfs/backref.c                    | 114 ++++--
 fs/btrfs/bio.c                        | 163 +++++++-
 fs/btrfs/bio.h                        |  16 +-
 fs/btrfs/btrfs_inode.h                |   3 +-
 fs/btrfs/compression.c                |   9 +
 fs/btrfs/ctree.h                      |   5 +
 fs/btrfs/defrag.c                     |  18 +-
 fs/btrfs/delayed-inode.c              |  29 +-
 fs/btrfs/delayed-inode.h              |   6 +-
 fs/btrfs/dir-item.c                   | 108 +++++-
 fs/btrfs/dir-item.h                   |  11 +-
 fs/btrfs/disk-io.c                    |   3 +-
 fs/btrfs/extent_io.c                  | 120 +++++-
 fs/btrfs/extent_io.h                  |   3 +
 fs/btrfs/extent_map.c                 | 104 ++++-
 fs/btrfs/extent_map.h                 |  26 ++
 fs/btrfs/file-item.c                  |  33 +-
 fs/btrfs/file-item.h                  |   7 +-
 fs/btrfs/file.c                       |  12 +-
 fs/btrfs/fs.h                         |   6 +-
 fs/btrfs/fscrypt.c                    | 423 ++++++++++++++++++++
 fs/btrfs/fscrypt.h                    | 116 ++++++
 fs/btrfs/inode.c                      | 529 ++++++++++++++++++++------
 fs/btrfs/ioctl.c                      |  69 ++--
 fs/btrfs/ordered-data.c               |  36 +-
 fs/btrfs/ordered-data.h               |  21 +-
 fs/btrfs/reflink.c                    |   8 +
 fs/btrfs/root-tree.c                  |   8 +-
 fs/btrfs/root-tree.h                  |   2 +-
 fs/btrfs/send.c                       | 140 ++++++-
 fs/btrfs/super.c                      | 106 +++++-
 fs/btrfs/super.h                      |   3 +-
 fs/btrfs/sysfs.c                      |   6 +
 fs/btrfs/tree-checker.c               |  66 +++-
 fs/btrfs/tree-log.c                   |  37 +-
 fs/btrfs/verity.c                     |   3 +
 fs/crypto/crypto.c                    |  10 +-
 fs/crypto/fname.c                     |  36 --
 fs/crypto/fscrypt_private.h           |  42 ++
 fs/crypto/hooks.c                     |  46 ++-
 fs/crypto/inline_crypt.c              |  84 +++-
 fs/crypto/keyring.c                   |  18 +-
 fs/crypto/keysetup.c                  | 166 ++++++++
 fs/crypto/policy.c                    |  47 +++
 include/linux/blk-crypto.h            |  15 +-
 include/linux/fscrypt.h               | 125 ++++++
 include/uapi/linux/btrfs.h            |   1 +
 include/uapi/linux/btrfs_tree.h       |  35 +-
 56 files changed, 2798 insertions(+), 350 deletions(-)
 create mode 100644 fs/btrfs/fscrypt.c
 create mode 100644 fs/btrfs/fscrypt.h

-- 
2.43.0