Merge patch series "Move fscrypt and fsverity info out of struct inode"

Eric Biggers <ebiggers@kernel.org> says:

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/20250723-work-inode-fscrypt-v4-0-c8e11488a0e6@kernel.org/

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.

* patches from https://lore.kernel.org/20250810075706.172910-1-ebiggers@kernel.org:
  fsverity: check IS_VERITY() in fsverity_cleanup_inode()
  fs: remove inode::i_verity_info
  btrfs: move verity info pointer to fs-specific part of inode
  f2fs: move verity info pointer to fs-specific part of inode
  ext4: move verity info pointer to fs-specific part of inode
  fsverity: add support for info in fs-specific part of inode
  fs: remove inode::i_crypt_info
  ceph: move crypt info pointer to fs-specific part of inode
  ubifs: move crypt info pointer to fs-specific part of inode
  f2fs: move crypt info pointer to fs-specific part of inode
  ext4: move crypt info pointer to fs-specific part of inode
  fscrypt: add support for info in fs-specific part of inode
  fscrypt: replace raw loads of info pointer with helper function

Link: https://lore.kernel.org/20250810075706.172910-1-ebiggers@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

1 files changed, 6 insertions, 5 deletions

diff --git a/fs/crypto/fname.c b/fs/crypto/fname.c
index f9f6713e144f..fb77ad1ca74a 100644
--- a/fs/crypto/fname.c
+++ b/fs/crypto/fname.c
@@ -94,7 +94,7 @@ static inline bool fscrypt_is_dot_dotdot(const struct qstr *str)
 int fscrypt_fname_encrypt(const struct inode *inode, const struct qstr *iname,
 			  u8 *out, unsigned int olen)
 {
-	const struct fscrypt_inode_info *ci = inode->i_crypt_info;
+	const struct fscrypt_inode_info *ci = fscrypt_get_inode_info_raw(inode);
 	struct crypto_sync_skcipher *tfm = ci->ci_enc_key.tfm;
 	SYNC_SKCIPHER_REQUEST_ON_STACK(req, tfm);
 	union fscrypt_iv iv;
@@ -138,7 +138,7 @@ static int fname_decrypt(const struct inode *inode,
 			 const struct fscrypt_str *iname,
 			 struct fscrypt_str *oname)
 {
-	const struct fscrypt_inode_info *ci = inode->i_crypt_info;
+	const struct fscrypt_inode_info *ci = fscrypt_get_inode_info_raw(inode);
 	struct crypto_sync_skcipher *tfm = ci->ci_enc_key.tfm;
 	SYNC_SKCIPHER_REQUEST_ON_STACK(req, tfm);
 	union fscrypt_iv iv;
@@ -274,8 +274,9 @@ bool __fscrypt_fname_encrypted_size(const union fscrypt_policy *policy,
 bool fscrypt_fname_encrypted_size(const struct inode *inode, u32 orig_len,
 				  u32 max_len, u32 *encrypted_len_ret)
 {
-	return __fscrypt_fname_encrypted_size(&inode->i_crypt_info->ci_policy,
-					      orig_len, max_len,
+	const struct fscrypt_inode_info *ci = fscrypt_get_inode_info_raw(inode);
+
+	return __fscrypt_fname_encrypted_size(&ci->ci_policy, orig_len, max_len,
 					      encrypted_len_ret);
 }
 EXPORT_SYMBOL_GPL(fscrypt_fname_encrypted_size);
@@ -543,7 +544,7 @@ EXPORT_SYMBOL_GPL(fscrypt_match_name);
  */
 u64 fscrypt_fname_siphash(const struct inode *dir, const struct qstr *name)
 {
-	const struct fscrypt_inode_info *ci = dir->i_crypt_info;
+	const struct fscrypt_inode_info *ci = fscrypt_get_inode_info_raw(dir);
 
 	WARN_ON_ONCE(!ci->ci_dirhash_key_initialized);