commit a3d1e7eb5abe3aa1095bc75d1a6760d3809bd672
author Al Viro <viro@zeniv.linux.org.uk> Mon Nov 18 09:43:10 2019 -0500
committer Al Viro <viro@zeniv.linux.org.uk> Tue Dec 10 22:29:58 2019 -0500
tree 1dce9bdc1052f0a94dffe67526e38f5a8202164f
parent e42617b825f8073569da76dc4510bfa019b1c35a

simple_recursive_removal(): kernel-side rm -rf for ramfs-style filesystems

two requirements: no file creations in IS_DEADDIR and no cross-directory
renames whatsoever.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

kernel/trace/trace.c

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 23459d5..84a0046 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -8496,7 +8496,7 @@ static struct trace_array *trace_array_create(const char *name)
 
 	ret = event_trace_add_tracer(tr->dir, tr);
 	if (ret) {
-		tracefs_remove_recursive(tr->dir);
+		tracefs_remove(tr->dir);
 		goto out_free_tr;
 	}
 
@@ -8605,7 +8605,7 @@ static int __remove_instance(struct trace_array *tr)
 	event_trace_del_tracer(tr);
 	ftrace_clear_pids(tr);
 	ftrace_destroy_function_files(tr);
-	tracefs_remove_recursive(tr->dir);
+	tracefs_remove(tr->dir);
 	free_trace_buffers(tr);
 
 	for (i = 0; i < tr->nr_topts; i++) {

kernel/trace/trace_events.c

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index c6de3ce..1faf3a1 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -697,7 +697,7 @@ static void remove_subsystem(struct trace_subsystem_dir *dir)
 		return;
 
 	if (!--dir->nr_events) {
-		tracefs_remove_recursive(dir->entry);
+		tracefs_remove(dir->entry);
 		list_del(&dir->list);
 		__put_system_dir(dir);
 	}
@@ -716,7 +716,7 @@ static void remove_event_file_dir(struct trace_event_file *file)
 		}
 		spin_unlock(&dir->d_lock);
 
-		tracefs_remove_recursive(dir);
+		tracefs_remove(dir);
 	}
 
 	list_del(&file->list);
@@ -3064,7 +3064,7 @@ int event_trace_del_tracer(struct trace_array *tr)
 
 	down_write(&trace_event_sem);
 	__trace_remove_event_dirs(tr);
-	tracefs_remove_recursive(tr->event_dir);
+	tracefs_remove(tr->event_dir);
 	up_write(&trace_event_sem);
 
 	tr->event_dir = NULL;

kernel/trace/trace_hwlat.c

diff --git a/kernel/trace/trace_hwlat.c b/kernel/trace/trace_hwlat.c
index 6638d63..402d022 100644
--- a/kernel/trace/trace_hwlat.c
+++ b/kernel/trace/trace_hwlat.c
@@ -556,7 +556,7 @@ static int init_tracefs(void)
 	return 0;
 
  err:
-	tracefs_remove_recursive(top_dir);
+	tracefs_remove(top_dir);
 	return -ENOMEM;
 }