6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: "Steven Rostedt (Google)" <rostedt@xxxxxxxxxxx>
commit 2819f23ac12ce93ff79ca7a54597df9a4a1f6331 upstream.
The update to removing the eventfs_file changed the way the events top
level directory was handled. Instead of returning a dentry, it now returns
the eventfs_inode. In this changed, the removing of the events top level
directory is not much different than removing any of the other
directories. Because of this, the removal just called eventfs_remove_dir()
instead of eventfs_remove_events_dir().
Although eventfs_remove_dir() does the clean up, it misses out on the
dget() of the ei->dentry done in eventfs_create_events_dir(). It makes
more sense to match eventfs_create_events_dir() with a specific function
eventfs_remove_events_dir() and this specific function can then perform
the dput() to the dentry that had the dget() when it was created.
Fixes: 5790b1fb3d67 ("eventfs: Remove eventfs_file and just use eventfs_inode")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202310051743.y9EobbUr-lkp@xxxxxxxxx/
Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/tracefs/event_inode.c | 19 +++++++------------
include/linux/tracefs.h | 1 +
kernel/trace/trace_events.c | 2 +-
3 files changed, 9 insertions(+), 13 deletions(-)
--- a/fs/tracefs/event_inode.c
+++ b/fs/tracefs/event_inode.c
@@ -901,22 +901,17 @@ void eventfs_remove_dir(struct eventfs_i
}
/**
- * eventfs_remove_events_dir - remove eventfs dir or file from list
- * @dentry: events's dentry to be removed.
+ * eventfs_remove_events_dir - remove the top level eventfs directory
+ * @ei: the event_inode returned by eventfs_create_events_dir().
*
- * This function remove events main directory
+ * This function removes the events main directory
*/
-void eventfs_remove_events_dir(struct dentry *dentry)
+void eventfs_remove_events_dir(struct eventfs_inode *ei)
{
- struct tracefs_inode *ti;
+ struct dentry *dentry = ei->dentry;
- if (!dentry || !dentry->d_inode)
- return;
+ eventfs_remove_dir(ei);
- ti = get_tracefs(dentry->d_inode);
- if (!ti || !(ti->flags & TRACEFS_EVENT_INODE))
- return;
-
- d_invalidate(dentry);
+ /* Matches the dget() from eventfs_create_events_dir() */
dput(dentry);
}
--- a/include/linux/tracefs.h
+++ b/include/linux/tracefs.h
@@ -41,6 +41,7 @@ struct eventfs_inode *eventfs_create_dir
const struct eventfs_entry *entries,
int size, void *data);
+void eventfs_remove_events_dir(struct eventfs_inode *ei);
void eventfs_remove_dir(struct eventfs_inode *ei);
struct dentry *tracefs_create_file(const char *name, umode_t mode,
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -3893,7 +3893,7 @@ int event_trace_del_tracer(struct trace_
down_write(&trace_event_sem);
__trace_remove_event_dirs(tr);
- eventfs_remove_dir(tr->event_dir);
+ eventfs_remove_events_dir(tr->event_dir);
up_write(&trace_event_sem);
tr->event_dir = NULL;
