eventfs: Make sure that parent->d_inode is locked in creating files/dirs

Since the locking of the parent->d_inode has been moved outside the
creation of the files and directories (as it use to be locked via a
conditional), add a WARN_ON_ONCE() to the case that it's not locked.

Link: https://lkml.kernel.org/r/[email protected]

Cc: Masami Hiramatsu <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Andrew Morton <[email protected]>
Reviewed-by: Josef Bacik <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>

fs/tracefs/event_inode.c

@@ -327,6 +327,8 @@ create_file_dentry(struct eventfs_inode *ei, int idx,
 	struct dentry **e_dentry = &ei->d_children[idx];
 	struct dentry *dentry;
 
+	WARN_ON_ONCE(!inode_is_locked(parent->d_inode));
+
 	mutex_lock(&eventfs_mutex);
 	if (ei->is_freed) {
 		mutex_unlock(&eventfs_mutex);
@@ -430,6 +432,8 @@ create_dir_dentry(struct eventfs_inode *pei, struct eventfs_inode *ei,
 {
 	struct dentry *dentry = NULL;
 
+	WARN_ON_ONCE(!inode_is_locked(parent->d_inode));
+
 	mutex_lock(&eventfs_mutex);
 	if (pei->is_freed || ei->is_freed) {
 		mutex_unlock(&eventfs_mutex);