linux-kernel - [PATCH v6 2/8] eventfs: Have a free_ei() that just frees the eventfs

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Date:   Wed, 01 Nov 2023 13:25:43 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ajay Kaher <akaher@...are.com>
Subject: [PATCH v6 2/8] eventfs: Have a free_ei() that just frees the eventfs_inode

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

As the eventfs_inode is freed in two different locations, make a helper
function free_ei() to make sure all the allocated fields of the
eventfs_inode is freed.

This requires renaming the existing free_ei() which is called by the srcu
handler to free_rcu_ei() and have free_ei() just do the freeing, where
free_rcu_ei() will call it.

Cc: Ajay Kaher <akaher@...are.com>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
Changes since v5: https://lkml.kernel.org/r/20231031223420.141626438@goodmis.org

- Resynced to this patch series

 fs/tracefs/event_inode.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/fs/tracefs/event_inode.c b/fs/tracefs/event_inode.c
index 1ce73acf3df0..dd5971855732 100644
--- a/fs/tracefs/event_inode.c
+++ b/fs/tracefs/event_inode.c
@@ -129,6 +129,13 @@ static struct dentry *create_dir(const char *name, struct dentry *parent)
 	return eventfs_end_creating(dentry);
 }
 
+static void free_ei(struct eventfs_inode *ei)
+{
+	kfree_const(ei->name);
+	kfree(ei->d_children);
+	kfree(ei);
+}
+
 /**
  * eventfs_set_ei_status_free - remove the dentry reference from an eventfs_inode
  * @ti: the tracefs_inode of the dentry
@@ -168,9 +175,7 @@ void eventfs_set_ei_status_free(struct tracefs_inode *ti, struct dentry *dentry)
 			eventfs_remove_dir(ei_child);
 		}
 
-		kfree_const(ei->name);
-		kfree(ei->d_children);
-		kfree(ei);
+		free_ei(ei);
 		return;
 	}
 
@@ -784,13 +789,11 @@ struct eventfs_inode *eventfs_create_events_dir(const char *name, struct dentry
 	return ERR_PTR(-ENOMEM);
 }
 
-static void free_ei(struct rcu_head *head)
+static void free_rcu_ei(struct rcu_head *head)
 {
 	struct eventfs_inode *ei = container_of(head, struct eventfs_inode, rcu);
 
-	kfree_const(ei->name);
-	kfree(ei->d_children);
-	kfree(ei);
+	free_ei(ei);
 }
 
 /**
@@ -881,7 +884,7 @@ void eventfs_remove_dir(struct eventfs_inode *ei)
 		for (i = 0; i < ei->nr_entries; i++)
 			unhook_dentry(&ei->d_children[i], &dentry_list);
 		unhook_dentry(&ei->dentry, &dentry_list);
-		call_srcu(&eventfs_srcu, &ei->rcu, free_ei);
+		call_srcu(&eventfs_srcu, &ei->rcu, free_rcu_ei);
 	}
 	mutex_unlock(&eventfs_mutex);
 
-- 
2.42.0