[PATCH v2 1/5] fsnotify: pass dentry instead of inode when available

[Amir Goldstein <amir73il@xxxxxxxxx>]

Define a new data type to pass for event FSNOTIFY_EVENT_DENTRY
and use it whenever a dentry is available instead of passing
it's ->d_inode as data type FSNOTIFY_EVENT_INODE.

None of the current fsnotify backends make use of the inode data
with data type FSNOTIFY_EVENT_INODE - only the data of type
FSNOTIFY_EVENT_PATH is ever used, so this change has no immediate
consequences.

Soon, we are going to use the dentry data type to support more
events with fanotify backend.

Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx>
---
 fs/notify/fsnotify.c             |  8 ++++----
 include/linux/fsnotify.h         | 15 +++++++--------
 include/linux/fsnotify_backend.h |  3 ++-
 3 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index ecf09b6243d9..6a120b7f8b94 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -178,11 +178,11 @@ int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask
 
 		take_dentry_name_snapshot(&name, dentry);
 		if (path)
-			ret = fsnotify(p_inode, mask, path, FSNOTIFY_EVENT_PATH,
-				       name.name, 0);
+			ret = fsnotify(p_inode, mask, path,
+				       FSNOTIFY_EVENT_PATH, name.name, 0);
 		else
-			ret = fsnotify(p_inode, mask, dentry->d_inode, FSNOTIFY_EVENT_INODE,
-				       name.name, 0);
+			ret = fsnotify(p_inode, mask, dentry,
+				       FSNOTIFY_EVENT_DENTRY, name.name, 0);
 		release_dentry_name_snapshot(&name);
 	}
 
diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
index 2ccb08cb5d6a..9dadc0bcd7a9 100644
--- a/include/linux/fsnotify.h
+++ b/include/linux/fsnotify.h
@@ -99,14 +99,14 @@ static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
 
 	fsnotify(old_dir, old_dir_mask, source, FSNOTIFY_EVENT_INODE, old_name,
 		 fs_cookie);
-	fsnotify(new_dir, new_dir_mask, source, FSNOTIFY_EVENT_INODE, new_name,
+	fsnotify(new_dir, new_dir_mask, moved, FSNOTIFY_EVENT_DENTRY, new_name,
 		 fs_cookie);
 
 	if (target)
 		fsnotify_link_count(target);
 
 	if (source)
-		fsnotify(source, FS_MOVE_SELF, moved->d_inode, FSNOTIFY_EVENT_INODE, NULL, 0);
+		fsnotify(source, FS_MOVE_SELF, moved, FSNOTIFY_EVENT_DENTRY, NULL, 0);
 	audit_inode_child(new_dir, moved, AUDIT_TYPE_CHILD_CREATE);
 }
 
@@ -155,7 +155,7 @@ static inline void fsnotify_create(struct inode *inode, struct dentry *dentry)
 {
 	audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE);
 
-	fsnotify(inode, FS_CREATE, dentry->d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0);
+	fsnotify(inode, FS_CREATE, dentry, FSNOTIFY_EVENT_DENTRY, dentry->d_name.name, 0);
 }
 
 /*
@@ -168,7 +168,7 @@ static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct
 	fsnotify_link_count(inode);
 	audit_inode_child(dir, new_dentry, AUDIT_TYPE_CHILD_CREATE);
 
-	fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE, new_dentry->d_name.name, 0);
+	fsnotify(dir, FS_CREATE, new_dentry, FSNOTIFY_EVENT_DENTRY, new_dentry->d_name.name, 0);
 }
 
 /*
@@ -177,11 +177,10 @@ static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct
 static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)
 {
 	__u32 mask = (FS_CREATE | FS_ISDIR);
-	struct inode *d_inode = dentry->d_inode;
 
 	audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE);
 
-	fsnotify(inode, mask, d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0);
+	fsnotify(inode, mask, dentry, FSNOTIFY_EVENT_DENTRY, dentry->d_name.name, 0);
 }
 
 /*
@@ -262,7 +261,7 @@ static inline void fsnotify_xattr(struct dentry *dentry)
 		mask |= FS_ISDIR;
 
 	fsnotify_parent(NULL, dentry, mask);
-	fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
+	fsnotify(inode, mask, dentry, FSNOTIFY_EVENT_DENTRY, NULL, 0);
 }
 
 /*
@@ -297,7 +296,7 @@ static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
 			mask |= FS_ISDIR;
 
 		fsnotify_parent(NULL, dentry, mask);
-		fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
+		fsnotify(inode, mask, dentry, FSNOTIFY_EVENT_DENTRY, NULL, 0);
 	}
 }
 
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index 7639774e7475..24d92455be03 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -208,10 +208,11 @@ struct fsnotify_group {
 	};
 };
 
-/* when calling fsnotify tell it if the data is a path or inode */
+/* when calling fsnotify tell it if the data is a path or inode or dentry */
 #define FSNOTIFY_EVENT_NONE	0
 #define FSNOTIFY_EVENT_PATH	1
 #define FSNOTIFY_EVENT_INODE	2
+#define FSNOTIFY_EVENT_DENTRY	3
 
 enum fsnotify_obj_type {
 	FSNOTIFY_OBJ_TYPE_INODE,
-- 
2.17.1