linux-kernel - [PATCH 4/8] eventfs: adding eventfs file, directory remove function

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Date:   Sun, 22 Jan 2023 22:37:03 +0530
From:   Ajay Kaher <akaher@...are.com>
To:     rostedt@...dmis.org, mhiramat@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        chinglinyu@...gle.com, namit@...are.com, srivatsab@...are.com,
        srivatsa@...il.mit.edu, amakhalov@...are.com,
        vsirnapalli@...are.com, tkundu@...are.com, er.ajay.kaher@...il.com,
        Ajay Kaher <akaher@...are.com>
Subject: [PATCH 4/8] eventfs: adding eventfs file, directory remove function

Adding eventfs_remove(), this function will recursively remove
dir or file info from eventfs.

Signed-off-by: Ajay Kaher <akaher@...are.com>
Co-developed-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
Tested-by: Ching-lin Yu <chinglinyu@...gle.com>
---
 fs/tracefs/event_inode.c | 26 ++++++++++++++++++++++++++
 include/linux/tracefs.h  |  2 ++
 2 files changed, 28 insertions(+)

diff --git a/fs/tracefs/event_inode.c b/fs/tracefs/event_inode.c
index e479712..4d47da0 100644
--- a/fs/tracefs/event_inode.c
+++ b/fs/tracefs/event_inode.c
@@ -279,3 +279,29 @@ int eventfs_add_file(const char *name, umode_t mode,
 	list_add_tail(&ef->list, &ef_parent->ei->e_top_files);
 	return 0;
 }
+
+/**
+ * eventfs_remove - remove eventfs dir or file from list
+ * @eventfs_file: a pointer to eventfs_file to be removed.
+ *
+ * This function recursively remove eventfs_file which
+ * contains info of file or dir.
+ */
+void eventfs_remove(struct eventfs_file *ef)
+{
+	struct eventfs_file *ef_child, *n;
+
+	if (!ef)
+		return;
+
+	if (ef->ei) {
+		/* search for nested folders or files */
+		list_for_each_entry_safe(ef_child, n, &ef->ei->e_top_files, list) {
+			eventfs_remove(ef_child);
+		}
+		kfree(ef->ei);
+	}
+	list_del(&ef->list);
+	kfree(ef->name);
+	kfree(ef);
+}
diff --git a/include/linux/tracefs.h b/include/linux/tracefs.h
index 7d390d2..b02cbba 100644
--- a/include/linux/tracefs.h
+++ b/include/linux/tracefs.h
@@ -55,6 +55,8 @@ int eventfs_add_top_file(const char *name, umode_t mode,
 			 struct dentry *parent, void *data,
 			 const struct file_operations *fops);
 
+void eventfs_remove(struct eventfs_file *ef);
+
 struct dentry *tracefs_create_file(const char *name, umode_t mode,
 				   struct dentry *parent, void *data,
 				   const struct file_operations *fops);
-- 
2.7.4