[PATCH slab/for-next 10/14] fanotify: specify SLAB_MAY_ACCOUNT for event caches

["Harry Yoo (Meta)" <harry@kernel.org>]

fanotify events are allocated with GFP_KERNEL_ACCOUNT and charged to
the memcg of the listener. Specify SLAB_MAY_ACCOUNT when the object
may be charged to a memcg. __GFP_ACCOUNT without SLAB_MAY_ACCOUNT
will not be allowed.

Path: fsnotify() -> fanotify_handle_event()
  -> fanotify_alloc_event(GFP_KERNEL_ACCOUNT)
  -> kmem_cache_alloc(fanotify_{fid,path,perm,mnt}_event_cachep)

Assisted-by: LLM
Cc: Jan Kara <jack@suse.cz>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Harry Yoo (Meta) <harry@kernel.org>
---
 fs/notify/fanotify/fanotify_user.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index a32c6634d592..bc1227e521a8 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -2184,14 +2184,16 @@ static int __init fanotify_user_setup(void)
 	fanotify_mark_cache = KMEM_CACHE(fanotify_mark,
 					 SLAB_PANIC|SLAB_ACCOUNT);
 	fanotify_fid_event_cachep = KMEM_CACHE(fanotify_fid_event,
-					       SLAB_PANIC);
+					       SLAB_PANIC|SLAB_MAY_ACCOUNT);
 	fanotify_path_event_cachep = KMEM_CACHE(fanotify_path_event,
-						SLAB_PANIC);
+						SLAB_PANIC|SLAB_MAY_ACCOUNT);
 	if (IS_ENABLED(CONFIG_FANOTIFY_ACCESS_PERMISSIONS)) {
 		fanotify_perm_event_cachep =
-			KMEM_CACHE(fanotify_perm_event, SLAB_PANIC);
+			KMEM_CACHE(fanotify_perm_event,
+				   SLAB_PANIC|SLAB_MAY_ACCOUNT);
 	}
-	fanotify_mnt_event_cachep = KMEM_CACHE(fanotify_mnt_event, SLAB_PANIC);
+	fanotify_mnt_event_cachep = KMEM_CACHE(fanotify_mnt_event,
+					       SLAB_PANIC|SLAB_MAY_ACCOUNT);
 
 	fanotify_max_queued_events = FANOTIFY_DEFAULT_MAX_EVENTS;
 	init_user_ns.ucount_max[UCOUNT_FANOTIFY_GROUPS] =

-- 
2.54.0