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>

3 files changed, 10 insertions, 0 deletions

diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index b99fb0273292..2c9489497cbe 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -338,6 +338,11 @@ struct btrfs_inode {
 	struct list_head delayed_iput;
 
 	struct rw_semaphore i_mmap_lock;
+
+#ifdef CONFIG_FS_VERITY
+	struct fsverity_info *i_verity_info;
+#endif
+
 	struct inode vfs_inode;
 };
 
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index b77dd22b8cdb..de722b232ec1 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7961,6 +7961,9 @@ static void init_once(void *foo)
 	struct btrfs_inode *ei = foo;
 
 	inode_init_once(&ei->vfs_inode);
+#ifdef CONFIG_FS_VERITY
+	ei->i_verity_info = NULL;
+#endif
 }
 
 void __cold btrfs_destroy_cachep(void)
diff --git a/fs/btrfs/verity.c b/fs/btrfs/verity.c
index b7a96a005487..4633cbcfcdb9 100644
--- a/fs/btrfs/verity.c
+++ b/fs/btrfs/verity.c
@@ -802,6 +802,8 @@ static int btrfs_write_merkle_tree_block(struct inode *inode, const void *buf,
 }
 
 const struct fsverity_operations btrfs_verityops = {
+	.inode_info_offs         = (int)offsetof(struct btrfs_inode, i_verity_info) -
+				   (int)offsetof(struct btrfs_inode, vfs_inode),
 	.begin_enable_verity     = btrfs_begin_enable_verity,
 	.end_enable_verity       = btrfs_end_enable_verity,
 	.get_verity_descriptor   = btrfs_get_verity_descriptor,