fsnotify: add flags to fsnotify_mark_entries

To differentiate between inode and vfsmount (or other future) types of
marks we add a flags field and set the inode bit on inode marks (the only
currently supported type of mark)

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

2 files changed, 5 insertions, 0 deletions

diff --git a/fs/notify/inode_mark.c b/fs/notify/inode_mark.c
index 6731408c49f7..b00065842b3e 100644
--- a/fs/notify/inode_mark.c
+++ b/fs/notify/inode_mark.c
@@ -322,6 +322,8 @@ int fsnotify_add_mark(struct fsnotify_mark_entry *entry,
         if (unlikely(!inode))
                 return -EINVAL;
 
+        entry->flags = FSNOTIFY_MARK_FLAG_INODE;
+
         /*
          * if this group isn't being testing for inode type events we need
          * to start testing
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index 0c0fd4ee2840..cf165857199b 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -267,6 +267,9 @@ struct fsnotify_mark_entry {
                 struct fsnotify_vfsmount_mark m;
         };
         struct list_head free_g_list;   /* tmp list used when freeing this mark */
+#define FSNOTIFY_MARK_FLAG_INODE        0x01
+#define FSNOTIFY_MARK_FLAG_VFSMOUNT     0x02
+        unsigned int flags;             /* vfsmount or inode mark? */
         void (*free_mark)(struct fsnotify_mark_entry *entry); /* called on final put+free */
 };