[PATCH 4/4] eventfs: Make sure that parent->d_inode is locked in creating files/dirs

[Steven Rostedt]

From: "Steven Rostedt (Google)" <rost...@goodmis.org>

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.

Signed-off-by: Steven Rostedt (Google) <rost...@goodmis.org>
---
 fs/tracefs/event_inode.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/tracefs/event_inode.c b/fs/tracefs/event_inode.c
index 590e8176449b..0b90869fd805 100644
--- a/fs/tracefs/event_inode.c
+++ b/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);
-- 
2.42.0