[PATCH 3/6] fsnotify: simplify arguments passing to fsnotify_parent()

[Amir Goldstein <amir73il@xxxxxxxxx>]

Instead of passing both dentry and path and having to figure out which
one to use, use the data/data_type convention to simplify the code.

Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx>
---
 fs/notify/fsnotify.c             | 21 ++++++++++-----------
 include/linux/fsnotify.h         | 14 ++------------
 include/linux/fsnotify_backend.h | 12 ++++++------
 3 files changed, 18 insertions(+), 29 deletions(-)

diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index 13578372aee8..a8b281569bbf 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -143,14 +143,18 @@ void __fsnotify_update_child_dentry_flags(struct inode *inode)
 }
 
 /* Notify this dentry's parent about a child's events. */
-int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask)
+int fsnotify_parent(__u32 mask, const void *data, int data_type)
 {
-	struct dentry *parent;
+	struct dentry *parent, *dentry;
 	struct inode *p_inode;
 	int ret = 0;
 
-	if (!dentry)
-		dentry = path->dentry;
+	if (data_type == FSNOTIFY_EVENT_DENTRY)
+		dentry = (struct dentry *)data;
+	else if (data_type == FSNOTIFY_EVENT_PATH)
+		dentry = ((struct path *)data)->dentry;
+	else
+		return 0;
 
 	if (!(dentry->d_flags & DCACHE_FSNOTIFY_PARENT_WATCHED))
 		return 0;
@@ -168,12 +172,7 @@ int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask
 		mask |= FS_EVENT_ON_CHILD;
 
 		take_dentry_name_snapshot(&name, dentry);
-		if (path)
-			ret = fsnotify(p_inode, mask, path, FSNOTIFY_EVENT_PATH,
-				       &name.name, 0);
-		else
-			ret = fsnotify(p_inode, mask, dentry,
-				       FSNOTIFY_EVENT_DENTRY, &name.name, 0);
+		ret = fsnotify(p_inode, mask, data, data_type, &name.name, 0);
 		release_dentry_name_snapshot(&name);
 	}
 
@@ -181,7 +180,7 @@ int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask
 
 	return ret;
 }
-EXPORT_SYMBOL_GPL(__fsnotify_parent);
+EXPORT_SYMBOL_GPL(fsnotify_parent);
 
 static int send_to_group(struct inode *to_tell,
 			 __u32 mask, const void *data,
diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
index 5746420bb121..dfdc8a1a3c38 100644
--- a/include/linux/fsnotify.h
+++ b/include/linux/fsnotify.h
@@ -30,30 +30,20 @@ static inline int fsnotify_dirent(struct inode *dir, struct dentry *dentry,
 			&dentry->d_name, 0);
 }
 
-/* Notify this dentry's parent about a child's events. */
-static inline int fsnotify_parent(const struct path *path,
-				  struct dentry *dentry, __u32 mask)
-{
-	if (!dentry)
-		dentry = path->dentry;
-
-	return __fsnotify_parent(path, dentry, mask);
-}
-
 /*
  * Simple wrappers to consolidate calls fsnotify_parent()/fsnotify() when
  * an event is on a path/dentry.
  */
 static inline void fsnotify_dentry(struct dentry *dentry, __u32 mask)
 {
-	fsnotify_parent(NULL, dentry, mask);
+	fsnotify_parent(mask, dentry, FSNOTIFY_EVENT_DENTRY);
 	fsnotify(d_inode(dentry), mask, dentry, FSNOTIFY_EVENT_DENTRY, NULL, 0);
 }
 
 static inline int fsnotify_path(struct inode *inode, const struct path *path,
 				__u32 mask)
 {
-	int ret = fsnotify_parent(path, NULL, mask);
+	int ret = fsnotify_parent(mask, path, FSNOTIFY_EVENT_PATH);
 
 	if (ret)
 		return ret;
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index cb47759b1ce9..77edd866926f 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -351,9 +351,9 @@ struct fsnotify_mark {
 /* called from the vfs helpers */
 
 /* main fsnotify call to send events */
-extern int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
-		    const struct qstr *name, u32 cookie);
-extern int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask);
+extern int fsnotify(struct inode *to_tell, __u32 mask, const void *data,
+		    int data_type, const struct qstr *name, u32 cookie);
+extern int fsnotify_parent(__u32 mask, const void *data, int data_type);
 extern void __fsnotify_inode_delete(struct inode *inode);
 extern void __fsnotify_vfsmount_delete(struct vfsmount *mnt);
 extern void fsnotify_sb_delete(struct super_block *sb);
@@ -508,13 +508,13 @@ static inline void fsnotify_init_event(struct fsnotify_event *event,
 
 #else
 
-static inline int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
-			   const struct qstr *name, u32 cookie)
+static inline int fsnotify(struct inode *to_tell, __u32 mask, const void *data,
+			   int data_type, const struct qstr *name, u32 cookie)
 {
 	return 0;
 }
 
-static inline int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask)
+static inline int fsnotify_parent(__u32 mask, const void *data, int data_type)
 {
 	return 0;
 }
-- 
2.17.1