linux-kernel - [PATCH 4/4] eventfs: Make sure that parent->d

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Message-ID: <20231121231112.853962542@goodmis.org>
Date:   Tue, 21 Nov 2023 18:10:07 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 4/4] eventfs: Make sure that parent->d_inode is locked in creating
 files/dirs

From: "Steven Rostedt (Google)" <rostedt@...dmis.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) <rostedt@...dmis.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