From: "Steven Rostedt (Google)" rostedt@goodmis.org
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@intel.com Closes: https://lore.kernel.org/oe-kbuild-all/202310051743.y9EobbUr-lkp@intel.com/ Signed-off-by: Steven Rostedt (Google) rostedt@goodmis.org (cherry picked from commit 2819f23ac12ce93ff79ca7a54597df9a4a1f6331) --- fs/tracefs/event_inode.c | 19 +++++++------------ include/linux/tracefs.h | 1 + kernel/trace/trace_events.c | 2 +- 3 files changed, 9 insertions(+), 13 deletions(-)
diff --git a/fs/tracefs/event_inode.c b/fs/tracefs/event_inode.c index eab18b157ef5..1ccd100bc565 100644 --- a/fs/tracefs/event_inode.c +++ b/fs/tracefs/event_inode.c @@ -901,22 +901,17 @@ void eventfs_remove_dir(struct eventfs_inode *ei) }
/** - * 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; - - if (!dentry || !dentry->d_inode) - return; + struct dentry *dentry = ei->dentry;
- ti = get_tracefs(dentry->d_inode); - if (!ti || !(ti->flags & TRACEFS_EVENT_INODE)) - return; + eventfs_remove_dir(ei);
- d_invalidate(dentry); + /* Matches the dget() from eventfs_create_events_dir() */ dput(dentry); } diff --git a/include/linux/tracefs.h b/include/linux/tracefs.h index 0c39704455d9..13359b1a35d1 100644 --- a/include/linux/tracefs.h +++ b/include/linux/tracefs.h @@ -41,6 +41,7 @@ struct eventfs_inode *eventfs_create_dir(const char *name, struct eventfs_inode 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, diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c index 6595317c3830..697163f8f670 100644 --- a/kernel/trace/trace_events.c +++ b/kernel/trace/trace_events.c @@ -3893,7 +3893,7 @@ int event_trace_del_tracer(struct trace_array *tr)
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;