Move fscrypt and fsverity info out of struct inode

This is a cleaned-up implementation of moving the i_crypt_info and i_verity_info pointers out of 'struct inode' and into the fs-specific part of the inode, as proposed previously by Christian at
https://lore.kernel.org/r/[email protected]/

The high-level concept is still the same: fs/crypto/ and fs/verity/ locate the pointer by adding an offset to the address of struct inode. The offset is retrieved from fscrypt_operations or fsverity_operations.

I've cleaned up a lot of the details, including:
- Grouped changes into patches differently
- Rewrote commit messages and comments to be clearer
- Adjusted code formatting to be consistent with existing code
- Removed unneeded #ifdefs
- Improved choice and location of VFS_WARN_ON_ONCE() statements
- Added missing kerneldoc for ubifs_inode::i_crypt_info
- Moved field initialization to init_once functions when they exist
- Improved ceph offset calculation and removed unneeded static_asserts
- fsverity_get_info() now checks IS_VERITY() instead of v_ops
- fscrypt_put_encryption_info() no longer checks IS_ENCRYPTED(), since I no longer think it's actually correct there.
- verity_data_blocks() now keeps doing a raw dereference
- Dropped fscrypt_set_inode_info()
- Renamed some functions
- Do offset calculation using int, so we don't rely on unsigned overflow
- And more.

For v4 and earlier, see
https://lore.kernel.org/r/[email protected]/

I'd like to take this series through the fscrypt tree for 6.18. (fsverity normally has a separate tree, but by choosing just one tree for this, we'll avoid conflicts in some places.)

Eric Biggers (13):
fscrypt: replace raw loads of info pointer with helper function
fscrypt: add support for info in fs-specific part of inode
ext4: move crypt info pointer to fs-specific part of inode
f2fs: move crypt info pointer to fs-specific part of inode
ubifs: move crypt info pointer to fs-specific part of inode
ceph: move crypt info pointer to fs-specific part of inode
fs: remove inode::i_crypt_info
fsverity: add support for info in fs-specific part of inode
ext4: move verity info pointer to fs-specific part of inode
f2fs: move verity info pointer to fs-specific part of inode
btrfs: move verity info pointer to fs-specific part of inode
fs: remove inode::i_verity_info
fsverity: check IS_VERITY() in fsverity_cleanup_inode()

 fs/btrfs/btrfs_inode.h       |  5 ++++
 fs/btrfs/inode.c             |  3 ++
 fs/btrfs/verity.c            |  2 ++
 fs/ceph/crypto.c             |  2 ++
 fs/ceph/inode.c              |  1 +
 fs/ceph/super.h              |  1 +
 fs/crypto/bio.c              |  2 +-
 fs/crypto/crypto.c           | 14 +++++----
 fs/crypto/fname.c            | 11 +++----
 fs/crypto/fscrypt_private.h  |  4 +--
 fs/crypto/hooks.c            |  2 +-
 fs/crypto/inline_crypt.c     | 12 ++++----
 fs/crypto/keysetup.c         | 43 ++++++++++++++++-----------
 fs/crypto/policy.c           |  7 +++--
 fs/ext4/crypto.c             |  2 ++
 fs/ext4/ext4.h               |  8 +++++
 fs/ext4/super.c              |  6 ++++
 fs/ext4/verity.c             |  2 ++
 fs/f2fs/f2fs.h               |  6 ++++
 fs/f2fs/super.c              | 10 ++++++-
 fs/f2fs/verity.c             |  2 ++
 fs/ubifs/crypto.c            |  2 ++
 fs/ubifs/ubifs.h             |  4 +++
 fs/verity/enable.c           |  6 ++--
 fs/verity/fsverity_private.h |  9 +++---
 fs/verity/open.c             | 23 ++++++++-------
 fs/verity/verify.c           |  2 +-
 include/linux/fs.h           | 10 -------
 include/linux/fscrypt.h      | 40 +++++++++++++++++++++++--
 include/linux/fsverity.h     | 57 +++++++++++++++++++++++++++++-------
 30 files changed, 215 insertions(+), 83 deletions(-)

base-commit: 561c80369df0733ba0574882a1635287b20f9de2

2.50.1