On Tue, 28 Oct 2025 00:45:38 +0000
Al Viro [off-list ref] wrote:

A mix of persistent and non-persistent dentries in there.  Strictly
speaking, no need for kill_litter_super() anyway - it pins an internal
mount whenever a persistent dentry is created, so at fs shutdown time
there won't be any to deal with.

However, let's make it explicit - replace d_instantiate() with
d_make_persistent() + dput() (the latter in tracefs_end_creating(),
where it folds with inode_unlock() into simple_done_creating())
for dentries we want persistent and have d_make_discardable() done
either by simple_recursive_removal() (used by tracefs_remove())
or explicitly in eventfs_remove_events_dir().

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

I ran the tracing selftests and some other tests I have against this and
nothing interesting happened. I didn't run my full test suite, but it looks
sane to me.

Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>

-- Steve