security: remove dead hook sb_umount_close

Unused hook.  Remove.

Signed-off-by: Eric Paris <eparis@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>

fs/namespace.c

@@ -628,7 +628,6 @@ repeat:
 		mnt->mnt_pinned = 0;
 		spin_unlock(&vfsmount_lock);
 		acct_auto_close_mnt(mnt);
-		security_sb_umount_close(mnt);
 		goto repeat;
 	}
 }

include/linux/security.h

@@ -272,11 +272,6 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
  *	@mnt contains the mounted file system.
  *	@flags contains the unmount flags, e.g. MNT_FORCE.
  *	Return 0 if permission is granted.
- * @sb_umount_close:
- *	Close any files in the @mnt mounted filesystem that are held open by
- *	the security module.  This hook is called during an umount operation
- *	prior to checking whether the filesystem is still busy.
- *	@mnt contains the mounted filesystem.
  * @sb_umount_busy:
  *	Handle a failed umount of the @mnt mounted filesystem, e.g.  re-opening
  *	any files that were closed by umount_close.  This hook is called during
@@ -1479,7 +1474,6 @@ struct security_operations {
 	int (*sb_mount) (char *dev_name, struct path *path,
 			 char *type, unsigned long flags, void *data);
 	int (*sb_umount) (struct vfsmount *mnt, int flags);
-	void (*sb_umount_close) (struct vfsmount *mnt);
 	void (*sb_umount_busy) (struct vfsmount *mnt);
 	void (*sb_post_remount) (struct vfsmount *mnt,
 				 unsigned long flags, void *data);
@@ -1777,7 +1771,6 @@ int security_sb_statfs(struct dentry *dentry);
 int security_sb_mount(char *dev_name, struct path *path,
 		      char *type, unsigned long flags, void *data);
 int security_sb_umount(struct vfsmount *mnt, int flags);
-void security_sb_umount_close(struct vfsmount *mnt);
 void security_sb_umount_busy(struct vfsmount *mnt);
 void security_sb_post_remount(struct vfsmount *mnt, unsigned long flags, void *data);
 void security_sb_post_addmount(struct vfsmount *mnt, struct path *mountpoint);
@@ -2096,9 +2089,6 @@ static inline int security_sb_umount(struct vfsmount *mnt, int flags)
 	return 0;
 }
 
-static inline void security_sb_umount_close(struct vfsmount *mnt)
-{ }
-
 static inline void security_sb_umount_busy(struct vfsmount *mnt)
 { }
 

security/capability.c

@@ -85,10 +85,6 @@ static int cap_sb_umount(struct vfsmount *mnt, int flags)
 	return 0;
 }
 
-static void cap_sb_umount_close(struct vfsmount *mnt)
-{
-}
-
 static void cap_sb_umount_busy(struct vfsmount *mnt)
 {
 }
@@ -937,7 +933,6 @@ void security_fixup_ops(struct security_operations *ops)
 	set_to_cap_if_null(ops, sb_statfs);
 	set_to_cap_if_null(ops, sb_mount);
 	set_to_cap_if_null(ops, sb_umount);
-	set_to_cap_if_null(ops, sb_umount_close);
 	set_to_cap_if_null(ops, sb_umount_busy);
 	set_to_cap_if_null(ops, sb_post_remount);
 	set_to_cap_if_null(ops, sb_post_addmount);

security/security.c

@@ -311,11 +311,6 @@ int security_sb_umount(struct vfsmount *mnt, int flags)
 	return security_ops->sb_umount(mnt, flags);
 }
 
-void security_sb_umount_close(struct vfsmount *mnt)
-{
-	security_ops->sb_umount_close(mnt);
-}
-
 void security_sb_umount_busy(struct vfsmount *mnt)
 {
 	security_ops->sb_umount_busy(mnt);