[PATCH v7 05/10] landlock: Move find_rule definition above landlock_append_fs_rule

[Justin Suess <utilityemal77@gmail.com>]

Move find_rule above landlock_append_fs_rule to allow usage of find_rule
from within without an additional prototype declaration

Cc: Tingmao Wang <m@maowtm.org>
Signed-off-by: Justin Suess <utilityemal77@gmail.com>
---

Notes:
    v6..v7 changes:
    
      * New patch split out from the v6 core NO_INHERIT implementation.

 security/landlock/fs.c | 58 +++++++++++++++++++++---------------------
 1 file changed, 29 insertions(+), 29 deletions(-)

diff --git a/security/landlock/fs.c b/security/landlock/fs.c
index 7ec26c671f91..86a3435ebbba 100644
--- a/security/landlock/fs.c
+++ b/security/landlock/fs.c
@@ -352,6 +352,35 @@ static enum landlock_walk_result landlock_walk_path_up(struct path *const path)
 	return LANDLOCK_WALK_CONTINUE;
 }
 
+/* Access-control management */
+
+/*
+ * The lifetime of the returned rule is tied to @domain.
+ *
+ * Returns NULL if no rule is found or if @dentry is negative.
+ */
+static const struct landlock_rule *
+find_rule(const struct landlock_ruleset *const domain,
+	  const struct dentry *const dentry)
+{
+	const struct landlock_rule *rule;
+	const struct inode *inode;
+	struct landlock_id id = {
+		.type = LANDLOCK_KEY_INODE,
+	};
+
+	/* Ignores nonexistent leafs. */
+	if (d_is_negative(dentry))
+		return NULL;
+
+	inode = d_backing_inode(dentry);
+	rcu_read_lock();
+	id.key.object = rcu_dereference(landlock_inode(inode)->object);
+	rule = landlock_find_rule(domain, id);
+	rcu_read_unlock();
+	return rule;
+}
+
 /*
  * @path: Should have been checked by get_path_from_fd().
  */
@@ -388,35 +417,6 @@ int landlock_append_fs_rule(struct landlock_ruleset *const ruleset,
 	return err;
 }
 
-/* Access-control management */
-
-/*
- * The lifetime of the returned rule is tied to @domain.
- *
- * Returns NULL if no rule is found or if @dentry is negative.
- */
-static const struct landlock_rule *
-find_rule(const struct landlock_ruleset *const domain,
-	  const struct dentry *const dentry)
-{
-	const struct landlock_rule *rule;
-	const struct inode *inode;
-	struct landlock_id id = {
-		.type = LANDLOCK_KEY_INODE,
-	};
-
-	/* Ignores nonexistent leafs. */
-	if (d_is_negative(dentry))
-		return NULL;
-
-	inode = d_backing_inode(dentry);
-	rcu_read_lock();
-	id.key.object = rcu_dereference(landlock_inode(inode)->object);
-	rule = landlock_find_rule(domain, id);
-	rcu_read_unlock();
-	return rule;
-}
-
 /*
  * Allows access to pseudo filesystems that will never be mountable (e.g.
  * sockfs, pipefs), but can still be reachable through
-- 
2.53.0