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fsverity: check IS_VERITY() in fsverity_cleanup_inode()

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Since getting the address of the fsverity_info has gotten a bit more
expensive, make fsverity_cleanup_inode() check for IS_VERITY() instead.
This avoids adding more overhead to non-verity files.

This assumes that verity info is never set when !IS_VERITY(), which is
currently true, but add a VFS_WARN_ON_ONCE() that asserts that.  (This
of course defeats the optimization, but only when CONFIG_VFS_DEBUG=y.)

Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Link: https://lore.kernel.org/20250810075706.172910-14-ebiggers@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Eric Biggers
2025-08-10 00:57:06 -07:00
committed by Christian Brauner
parent 818c659ac1
commit 8a3d00dde6
1 changed files with 8 additions and 1 deletions
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9
include/linux/fsverity.h
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@@ -190,8 +190,15 @@ void __fsverity_cleanup_inode(struct inode *inode);
*/
static inline void fsverity_cleanup_inode(struct inode *inode)
{
if (*fsverity_info_addr(inode))
/*
* Only IS_VERITY() inodes can have verity info, so start by checking
* for IS_VERITY() (which is faster than retrieving the pointer to the
* verity info). This minimizes overhead for non-verity inodes.
*/
if (IS_VERITY(inode))
__fsverity_cleanup_inode(inode);
else
VFS_WARN_ON_ONCE(*fsverity_info_addr(inode) != NULL);
}
/* read_metadata.c */