fsnotify: kill FSNOTIFY_EVENT_FILE

Some fsnotify operations send a struct file.  This is more information than
we technically need.  We instead send a struct path in all cases instead of
sometimes a path and sometimes a file.
Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
Signed-off-by: Eric Paris <eparis@redhat.com>

fs/notify/fsnotify.c

@@ -79,15 +79,15 @@ void __fsnotify_update_child_dentry_flags(struct inode *inode)
 }
 
 /* Notify this dentry's parent about a child's events. */
-void __fsnotify_parent(struct file *file, struct dentry *dentry, __u32 mask)
+void __fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask)
 {
 	struct dentry *parent;
 	struct inode *p_inode;
 	bool send = false;
 	bool should_update_children = false;
 
-	if (file)
-		dentry = file->f_path.dentry;
+	if (!dentry)
+		dentry = path->dentry;
 
 	if (!(dentry->d_flags & DCACHE_FSNOTIFY_PARENT_WATCHED))
 		return;
@@ -119,8 +119,8 @@ void __fsnotify_parent(struct file *file, struct dentry *dentry, __u32 mask)
 		 * specifies these are events which came from a child. */
 		mask |= FS_EVENT_ON_CHILD;
 
-		if (file)
-			fsnotify(p_inode, mask, file, FSNOTIFY_EVENT_FILE,
+		if (path)
+			fsnotify(p_inode, mask, path, FSNOTIFY_EVENT_PATH,
 				 dentry->d_name.name, 0);
 		else
 			fsnotify(p_inode, mask, dentry->d_inode, FSNOTIFY_EVENT_INODE,
@@ -194,8 +194,6 @@ void fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is, const
  
 	if (data_is == FSNOTIFY_EVENT_PATH)
 		mnt = ((struct path *)data)->mnt;
-	else if (data_is == FSNOTIFY_EVENT_FILE)
-		mnt = ((struct file *)data)->f_path.mnt;
 
 	/* if this inode's directed listeners don't care and nothing on the vfsmount
 	 * listeners list cares, nothing to do */

fs/notify/notification.c

@@ -390,15 +390,6 @@ struct fsnotify_event *fsnotify_create_event(struct inode *to_tell, __u32 mask,
 	event->data_type = data_type;
 
 	switch (data_type) {
-	case FSNOTIFY_EVENT_FILE: {
-		struct file *file = data;
-		struct path *path = &file->f_path;
-		event->path.dentry = path->dentry;
-		event->path.mnt = path->mnt;
-		path_get(&event->path);
-		event->data_type = FSNOTIFY_EVENT_PATH;
-		break;
-	}
 	case FSNOTIFY_EVENT_PATH: {
 		struct path *path = data;
 		event->path.dentry = path->dentry;

include/linux/fsnotify.h

@@ -26,14 +26,12 @@ static inline void fsnotify_d_instantiate(struct dentry *entry,
 }
 
 /* Notify this dentry's parent about a child's events. */
-static inline void fsnotify_parent(struct file *file, struct dentry *dentry, __u32 mask)
+static inline void fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask)
 {
-	BUG_ON(file && dentry);
+	if (!dentry)
+		dentry = path->dentry;
 
-	if (file)
-		dentry = file->f_path.dentry;
-
-	__fsnotify_parent(file, dentry, mask);
+	__fsnotify_parent(path, dentry, mask);
 }
 
 /*
@@ -160,14 +158,15 @@ static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)
  */
 static inline void fsnotify_access(struct file *file)
 {
-	struct inode *inode = file->f_path.dentry->d_inode;
+	struct path *path = &file->f_path;
+	struct inode *inode = path->dentry->d_inode;
 	__u32 mask = FS_ACCESS;
 
 	if (S_ISDIR(inode->i_mode))
 		mask |= FS_IN_ISDIR;
 
-	fsnotify_parent(file, NULL, mask);
-	fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE, NULL, 0);
+	fsnotify_parent(path, NULL, mask);
+	fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
 }
 
 /*
@@ -175,14 +174,15 @@ static inline void fsnotify_access(struct file *file)
  */
 static inline void fsnotify_modify(struct file *file)
 {
-	struct inode *inode = file->f_path.dentry->d_inode;
+	struct path *path = &file->f_path;
+	struct inode *inode = path->dentry->d_inode;
 	__u32 mask = FS_MODIFY;
 
 	if (S_ISDIR(inode->i_mode))
 		mask |= FS_IN_ISDIR;
 
-	fsnotify_parent(file, NULL, mask);
-	fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE, NULL, 0);
+	fsnotify_parent(path, NULL, mask);
+	fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
 }
 
 /*
@@ -190,14 +190,15 @@ static inline void fsnotify_modify(struct file *file)
  */
 static inline void fsnotify_open(struct file *file)
 {
-	struct inode *inode = file->f_path.dentry->d_inode;
+	struct path *path = &file->f_path;
+	struct inode *inode = path->dentry->d_inode;
 	__u32 mask = FS_OPEN;
 
 	if (S_ISDIR(inode->i_mode))
 		mask |= FS_IN_ISDIR;
 
-	fsnotify_parent(file, NULL, mask);
-	fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE, NULL, 0);
+	fsnotify_parent(path, NULL, mask);
+	fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
 }
 
 /*
@@ -205,6 +206,7 @@ static inline void fsnotify_open(struct file *file)
  */
 static inline void fsnotify_close(struct file *file)
 {
+	struct path *path = &file->f_path;
 	struct inode *inode = file->f_path.dentry->d_inode;
 	fmode_t mode = file->f_mode;
 	__u32 mask = (mode & FMODE_WRITE) ? FS_CLOSE_WRITE : FS_CLOSE_NOWRITE;
@@ -212,8 +214,8 @@ static inline void fsnotify_close(struct file *file)
 	if (S_ISDIR(inode->i_mode))
 		mask |= FS_IN_ISDIR;
 
-	fsnotify_parent(file, NULL, mask);
-	fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE, NULL, 0);
+	fsnotify_parent(path, NULL, mask);
+	fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
 }
 
 /*

include/linux/fsnotify_backend.h

@@ -214,7 +214,6 @@ struct fsnotify_event {
 #define FSNOTIFY_EVENT_NONE	0
 #define FSNOTIFY_EVENT_PATH	1
 #define FSNOTIFY_EVENT_INODE	2
-#define FSNOTIFY_EVENT_FILE	3
 	int data_type;		/* which of the above union we have */
 	atomic_t refcnt;	/* how many groups still are using/need to send this event */
 	__u32 mask;		/* the type of access, bitwise OR for FS_* event types */
@@ -280,7 +279,7 @@ struct fsnotify_mark_entry {
 /* main fsnotify call to send events */
 extern void fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is,
 		     const char *name, u32 cookie);
-extern void __fsnotify_parent(struct file *file, struct dentry *dentry, __u32 mask);
+extern void __fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask);
 extern void __fsnotify_inode_delete(struct inode *inode);
 extern u32 fsnotify_get_cookie(void);
 
@@ -393,7 +392,7 @@ static inline void fsnotify(struct inode *to_tell, __u32 mask, void *data, int d
 			    const char *name, u32 cookie)
 {}
 
-static inline void __fsnotify_parent(struct file *file, struct dentry *dentry, __u32 mask)
+static inline void __fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask)
 {}
 
 static inline void __fsnotify_inode_delete(struct inode *inode)