fsnotify: let connector point to an abstract object
Make the code to attach/detach a connector to object more generic
by letting the fsnotify connector point to an abstract fsnotify_connp_t.
Code that needs to dereference an inode or mount object now uses the
helpers fsnotify_conn_{inode,mount}.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index 8efb866..381cfb0 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -256,6 +256,13 @@ FSNOTIFY_ITER_FUNCS(vfsmount, VFSMOUNT)
for (type = 0; type < FSNOTIFY_OBJ_TYPE_COUNT; type++)
/*
+ * fsnotify_connp_t is what we embed in objects which connector can be attached
+ * to. fsnotify_connp_t * is how we refer from connector back to object.
+ */
+struct fsnotify_mark_connector;
+typedef struct fsnotify_mark_connector __rcu *fsnotify_connp_t;
+
+/*
* Inode / vfsmount point to this structure which tracks all marks attached to
* the inode / vfsmount. The reference to inode / vfsmount is held by this
* structure. We destroy this structure when there are no more marks attached
@@ -264,17 +271,15 @@ FSNOTIFY_ITER_FUNCS(vfsmount, VFSMOUNT)
struct fsnotify_mark_connector {
spinlock_t lock;
unsigned int type; /* Type of object [lock] */
- union { /* Object pointer [lock] */
- struct inode *inode;
- struct vfsmount *mnt;
+ union {
+ /* Object pointer [lock] */
+ fsnotify_connp_t *obj;
/* Used listing heads to free after srcu period expires */
struct fsnotify_mark_connector *destroy_next;
};
struct hlist_head list;
};
-typedef struct fsnotify_mark_connector __rcu *fsnotify_connp_t;
-
/*
* A mark is simply an object attached to an in core inode which allows an
* fsnotify listener to indicate they are either no longer interested in events