linux-kernel - [v6.6][PATCH 06/57] Revert "eventfs: Remove "is

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Date: Tue, 06 Feb 2024 07:09:11 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org,
 stable@...r.kernel.org
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Sasha Levin <sashal@...nel.org>,
 Masami Hiramatsu <mhiramat@...nel.org>,
 Mark Rutland <mark.rutland@....com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: [v6.6][PATCH 06/57] Revert "eventfs: Remove "is_freed" union with rcu head"

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

This reverts commit fa18a8a0539b02cc621938091691f0b73f0b1288.

The eventfs was not designed properly and may have some hidden bugs in it.
Linus rewrote it properly and I trust his version more than this one. Revert
the backported patches for 6.6 and re-apply all the changes to make it
equivalent to Linus's version.

Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 fs/tracefs/event_inode.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/fs/tracefs/event_inode.c b/fs/tracefs/event_inode.c
index a64d8fa39e54..8c8d64e76103 100644
--- a/fs/tracefs/event_inode.c
+++ b/fs/tracefs/event_inode.c
@@ -38,7 +38,6 @@ struct eventfs_inode {
  * @fop:	file_operations for file or directory
  * @iop:	inode_operations for file or directory
  * @data:	something that the caller will want to get to later on
- * @is_freed:	Flag set if the eventfs is on its way to be freed
  * @mode:	the permission that the file or directory should have
  */
 struct eventfs_file {
@@ -53,14 +52,15 @@ struct eventfs_file {
 	 * Union - used for deletion
 	 * @del_list:	list of eventfs_file to delete
 	 * @rcu:	eventfs_file to delete in RCU
+	 * @is_freed:	node is freed if one of the above is set
 	 */
 	union {
 		struct list_head	del_list;
 		struct rcu_head		rcu;
+		unsigned long		is_freed;
 	};
 	void				*data;
-	unsigned int			is_freed:1;
-	unsigned int			mode:31;
+	umode_t				mode;
 };
 
 static DEFINE_MUTEX(eventfs_mutex);
@@ -814,8 +814,6 @@ static void eventfs_remove_rec(struct eventfs_file *ef, struct list_head *head,
 		}
 	}
 
-	ef->is_freed = 1;
-
 	list_del_rcu(&ef->list);
 	list_add_tail(&ef->del_list, head);
 }
-- 
2.43.0