[PATCH 3/5] inotify: use container_of instead of casting

[Eric Paris <eparis@redhat.com>]

inotify_free_mark casts directly from an fsnotify_mark_entry to an
inotify_inode_mark_entry.  This works, but should use container_of instead
for future proofing.

Signed-off-by: Eric Paris <eparis@redhat.com>
---

 fs/notify/inotify/inotify_user.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index c3086b0..fb38e73 100644
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -424,7 +424,9 @@ skip_send_ignore:
 /* ding dong the mark is dead */
 static void inotify_free_mark(struct fsnotify_mark_entry *entry)
 {
-	struct inotify_inode_mark_entry *ientry = (struct inotify_inode_mark_entry *)entry;
+	struct inotify_inode_mark_entry *ientry;
+
+	ientry = container_of(entry, struct inotify_inode_mark_entry, fsn_entry);
 
 	kmem_cache_free(inotify_inode_mark_cachep, ientry);
 }