diff options
| author | Eric Biggers <ebiggers@kernel.org> | 2025-08-10 00:57:05 -0700 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2025-08-21 13:58:08 +0200 |
| commit | 818c659ac164e4e4639ceaedaccbdfebb1ef63b5 (patch) | |
| tree | e9ca83772f6a07c1f0b389f585ccb54522d634c9 /include/linux/fsverity.h | |
| parent | fcafdd4210658986470208230253ba5cdc6107a0 (diff) | |
fs: remove inode::i_verity_info
Now that all fsverity-capable filesystems store the pointer to
fsverity_info in the filesystem-specific part of the inode structure,
inode::i_verity_info is no longer needed. Update fsverity_info_addr()
to no longer support the fallback to inode::i_verity_info. Finally,
remove inode::i_verity_info itself, and move the forward declaration of
struct fsverity_info from fs.h (which no longer needs it) to fsverity.h.
The end result of the migration to the filesystem-specific pointer is
memory savings on CONFIG_FS_VERITY=y kernels for all filesystems that
don't support fsverity. Specifically, their in-memory inodes are now
smaller by the size of a pointer: either 4 or 8 bytes.
Co-developed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Link: https://lore.kernel.org/20250810075706.172910-13-ebiggers@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'include/linux/fsverity.h')
| -rw-r--r-- | include/linux/fsverity.h | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/include/linux/fsverity.h b/include/linux/fsverity.h index e0f132cb7839..844f7b8b56bb 100644 --- a/include/linux/fsverity.h +++ b/include/linux/fsverity.h @@ -26,6 +26,8 @@ /* Arbitrary limit to bound the kmalloc() size. Can be changed. */ #define FS_VERITY_MAX_DESCRIPTOR_SIZE 16384 +struct fsverity_info; + /* Verity operations for filesystems */ struct fsverity_operations { /** @@ -130,11 +132,15 @@ struct fsverity_operations { #ifdef CONFIG_FS_VERITY +/* + * Returns the address of the verity info pointer within the filesystem-specific + * part of the inode. (To save memory on filesystems that don't support + * fsverity, a field in 'struct inode' itself is no longer used.) + */ static inline struct fsverity_info ** fsverity_info_addr(const struct inode *inode) { - if (inode->i_sb->s_vop->inode_info_offs == 0) - return (struct fsverity_info **)&inode->i_verity_info; + VFS_WARN_ON_ONCE(inode->i_sb->s_vop->inode_info_offs == 0); return (void *)inode + inode->i_sb->s_vop->inode_info_offs; } |