fsverity: optimize fsverity_prepare_setattr() on non-verity files

Make fsverity_prepare_setattr() an inline function that does the
IS_VERITY() check, then (if needed) calls __fsverity_prepare_setattr()
to do the real work.  This reduces the overhead on non-verity files.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Acked-by: Dave Chinner <dchinner@redhat.com>
Link: https://lore.kernel.org/r/20221214224304.145712-3-ebiggers@kernel.org

diff --git a/fs/verity/open.c b/fs/verity/open.c
index 673d6db..e1e531d 100644 (file)
--- a/fs/verity/open.c
+++ b/fs/verity/open.c
@@ -337,26 +337,16 @@ int __fsverity_file_open(struct inode *inode, struct file *filp)
 }
 EXPORT_SYMBOL_GPL(__fsverity_file_open);
 
-/**
- * fsverity_prepare_setattr() - prepare to change a verity inode's attributes
- * @dentry: dentry through which the inode is being changed
- * @attr: attributes to change
- *
- * Verity files are immutable, so deny truncates.  This isn't covered by the
- * open-time check because sys_truncate() takes a path, not a file descriptor.
- *
- * Return: 0 on success, -errno on failure
- */
-int fsverity_prepare_setattr(struct dentry *dentry, struct iattr *attr)
+int __fsverity_prepare_setattr(struct dentry *dentry, struct iattr *attr)
 {
-       if (IS_VERITY(d_inode(dentry)) && (attr->ia_valid & ATTR_SIZE)) {
+       if (attr->ia_valid & ATTR_SIZE) {
                pr_debug("Denying truncate of verity file (ino %lu)\n",
                         d_inode(dentry)->i_ino);
                return -EPERM;
        }
        return 0;
 }
-EXPORT_SYMBOL_GPL(fsverity_prepare_setattr);
+EXPORT_SYMBOL_GPL(__fsverity_prepare_setattr);
 
 /**
  * fsverity_cleanup_inode() - free the inode's verity info, if present

diff --git a/include/linux/fsverity.h b/include/linux/fsverity.h
index 326bf2e..84b498f 100644 (file)
--- a/include/linux/fsverity.h
+++ b/include/linux/fsverity.h
@@ -149,7 +149,7 @@ int fsverity_get_digest(struct inode *inode,
 /* open.c */
 
 int __fsverity_file_open(struct inode *inode, struct file *filp);
-int fsverity_prepare_setattr(struct dentry *dentry, struct iattr *attr);
+int __fsverity_prepare_setattr(struct dentry *dentry, struct iattr *attr);
 void fsverity_cleanup_inode(struct inode *inode);
 
 /* read_metadata.c */
@@ -198,10 +198,10 @@ static inline int __fsverity_file_open(struct inode *inode, struct file *filp)
        return -EOPNOTSUPP;
 }
 
-static inline int fsverity_prepare_setattr(struct dentry *dentry,
-                                          struct iattr *attr)
+static inline int __fsverity_prepare_setattr(struct dentry *dentry,
+                                            struct iattr *attr)
 {
-       return IS_VERITY(d_inode(dentry)) ? -EOPNOTSUPP : 0;
+       return -EOPNOTSUPP;
 }
 
 static inline void fsverity_cleanup_inode(struct inode *inode)
@@ -274,4 +274,22 @@ static inline int fsverity_file_open(struct inode *inode, struct file *filp)
        return 0;
 }
 
+/**
+ * fsverity_prepare_setattr() - prepare to change a verity inode's attributes
+ * @dentry: dentry through which the inode is being changed
+ * @attr: attributes to change
+ *
+ * Verity files are immutable, so deny truncates.  This isn't covered by the
+ * open-time check because sys_truncate() takes a path, not a file descriptor.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+static inline int fsverity_prepare_setattr(struct dentry *dentry,
+                                          struct iattr *attr)
+{
+       if (IS_VERITY(d_inode(dentry)))
+               return __fsverity_prepare_setattr(dentry, attr);
+       return 0;
+}
+
 #endif /* _LINUX_FSVERITY_H */