[PATCH 3/4] fsverity: optimize fsverity_cleanup_inode() on non-verity files

[Eric Biggers <ebiggers@kernel.org>]

From: Eric Biggers <ebiggers@google.com>

Make fsverity_cleanup_inode() an inline function that checks for
non-NULL ->i_verity_info, then (if needed) calls
__fsverity_cleanup_inode() to do the real work.  This reduces the
overhead on non-verity files.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/verity/open.c         | 10 ++--------
 include/linux/fsverity.h | 14 +++++++++++++-
 2 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/fs/verity/open.c b/fs/verity/open.c
index e1e531d5e09a..c723a62841db 100644
--- a/fs/verity/open.c
+++ b/fs/verity/open.c
@@ -348,18 +348,12 @@ int __fsverity_prepare_setattr(struct dentry *dentry, struct iattr *attr)
 }
 EXPORT_SYMBOL_GPL(__fsverity_prepare_setattr);
 
-/**
- * fsverity_cleanup_inode() - free the inode's verity info, if present
- * @inode: an inode being evicted
- *
- * Filesystems must call this on inode eviction to free ->i_verity_info.
- */
-void fsverity_cleanup_inode(struct inode *inode)
+void __fsverity_cleanup_inode(struct inode *inode)
 {
 	fsverity_free_info(inode->i_verity_info);
 	inode->i_verity_info = NULL;
 }
-EXPORT_SYMBOL_GPL(fsverity_cleanup_inode);
+EXPORT_SYMBOL_GPL(__fsverity_cleanup_inode);
 
 int __init fsverity_init_info_cache(void)
 {
diff --git a/include/linux/fsverity.h b/include/linux/fsverity.h
index 84b498fff7ec..203f4962c54a 100644
--- a/include/linux/fsverity.h
+++ b/include/linux/fsverity.h
@@ -150,7 +150,19 @@ int fsverity_get_digest(struct inode *inode,
 
 int __fsverity_file_open(struct inode *inode, struct file *filp);
 int __fsverity_prepare_setattr(struct dentry *dentry, struct iattr *attr);
-void fsverity_cleanup_inode(struct inode *inode);
+void __fsverity_cleanup_inode(struct inode *inode);
+
+/**
+ * fsverity_cleanup_inode() - free the inode's verity info, if present
+ * @inode: an inode being evicted
+ *
+ * Filesystems must call this on inode eviction to free ->i_verity_info.
+ */
+static inline void fsverity_cleanup_inode(struct inode *inode)
+{
+	if (inode->i_verity_info)
+		__fsverity_cleanup_inode(inode);
+}
 
 /* read_metadata.c */
 
-- 
2.38.1