[PATCH v3 11/13] fsnotify: add fsnotify_connector_inode() wrapper

[Amir Goldstein <amir73il@xxxxxxxxx>]

Soon we will be changing the way to dereference an inode object from
connector object. Introduce a wrapper to abstract this dereference.

Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx>
---
 fs/notify/fdinfo.c               |  4 ++--
 fs/notify/mark.c                 |  3 ++-
 include/linux/fsnotify_backend.h |  6 ++++++
 kernel/audit_tree.c              | 11 ++++++-----
 4 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/fs/notify/fdinfo.c b/fs/notify/fdinfo.c
index 10aac1942c9f..b3cf03e347a8 100644
--- a/fs/notify/fdinfo.c
+++ b/fs/notify/fdinfo.c
@@ -81,7 +81,7 @@ static void inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
 		return;
 
 	inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
-	inode = igrab(mark->connector->inode);
+	inode = igrab(fsnotify_connector_inode(mark->connector));
 	if (inode) {
 		/*
 		 * IN_ALL_EVENTS represents all of the mask bits
@@ -117,7 +117,7 @@ static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
 		mflags |= FAN_MARK_IGNORED_SURV_MODIFY;
 
 	if (mark->connector->type == FSNOTIFY_OBJ_TYPE_INODE) {
-		inode = igrab(mark->connector->inode);
+		inode = igrab(fsnotify_connector_inode(mark->connector));
 		if (!inode)
 			return;
 		seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ",
diff --git a/fs/notify/mark.c b/fs/notify/mark.c
index 771178c46eeb..7103a0a442e7 100644
--- a/fs/notify/mark.c
+++ b/fs/notify/mark.c
@@ -140,7 +140,8 @@ void fsnotify_recalc_mask(struct fsnotify_mark_connector *conn)
 	__fsnotify_recalc_mask(conn);
 	spin_unlock(&conn->lock);
 	if (conn->type == FSNOTIFY_OBJ_TYPE_INODE)
-		__fsnotify_update_child_dentry_flags(conn->inode);
+		__fsnotify_update_child_dentry_flags(
+				fsnotify_connector_inode(conn));
 }
 
 /* Free all connectors queued for freeing once SRCU period ends */
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index b2826dd1e68c..6e9397c16124 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -279,6 +279,12 @@ static inline struct inode *fsnotify_obj_inode(struct fsnotify_obj *obj)
 	return container_of(obj, struct inode, i_fsnotify);
 }
 
+static inline struct inode *fsnotify_connector_inode(
+		struct fsnotify_mark_connector *conn)
+{
+	return conn->inode;
+}
+
 /*
  * 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
diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
index eadee98f5a12..529e4757f4e1 100644
--- a/kernel/audit_tree.c
+++ b/kernel/audit_tree.c
@@ -183,7 +183,7 @@ static unsigned long chunk_to_key(struct audit_chunk *chunk)
 	 */
 	if (WARN_ON_ONCE(!chunk->mark.connector))
 		return 0;
-	return (unsigned long)chunk->mark.connector->inode;
+	return (unsigned long)fsnotify_connector_inode(chunk->mark.connector);
 }
 
 static inline struct list_head *chunk_hash(unsigned long key)
@@ -258,7 +258,7 @@ static void untag_chunk(struct node *p)
 	spin_lock(&entry->lock);
 	/*
 	 * mark_mutex protects mark from getting detached and thus also from
-	 * mark->connector->inode getting NULL.
+	 * mark->connector->obj getting NULL.
 	 */
 	if (chunk->dead || !(entry->flags & FSNOTIFY_MARK_FLAG_ATTACHED)) {
 		spin_unlock(&entry->lock);
@@ -288,8 +288,9 @@ static void untag_chunk(struct node *p)
 	if (!new)
 		goto Fallback;
 
-	if (fsnotify_add_inode_mark_locked(&new->mark, entry->connector->inode,
-					   1)) {
+	if (fsnotify_add_inode_mark_locked(&new->mark,
+				fsnotify_connector_inode(entry->connector),
+				1)) {
 		fsnotify_put_mark(&new->mark);
 		goto Fallback;
 	}
@@ -434,7 +435,7 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
 	}
 
 	if (fsnotify_add_inode_mark_locked(chunk_entry,
-			     old_entry->connector->inode, 1)) {
+			fsnotify_connector_inode(old_entry->connector), 1)) {
 		spin_unlock(&old_entry->lock);
 		mutex_unlock(&old_entry->group->mark_mutex);
 		fsnotify_put_mark(chunk_entry);
-- 
2.7.4