locks: fix setlease methods to free passed-in lock

We modified setlease to require the caller to allocate the new lease in
the case of creating a new lease, but forgot to fix up the filesystem
methods.

Cc: Steven Whitehouse <[e-mail]>
Cc: Steve French <[e-mail]>
Cc: Trond Myklebust <[e-mail]>
Signed-off-by: J. Bruce Fields <[e-mail]>
Acked-by: Arnd Bergmann <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

fs/cifs/cifsfs.c

···
 		   knows that the file won't be changed on the server
 		   by anyone else */
 		return generic_setlease(file, arg, lease);
-	else
+	else {
+		if (arg != F_UNLCK)
+			locks_free_lock(*lease);
 		return -EAGAIN;
+	}
 }
 
 struct file_system_type cifs_fs_type = {

fs/gfs2/file.c

···
 
 static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
 {
+	if (arg != F_UNLCK)
+		locks_free_lock(*fl);
 	return -EINVAL;
 }
 

fs/locks.c

···
 EXPORT_SYMBOL_GPL(locks_release_private);
 
 /* Free a lock which is not in use. */
-static void locks_free_lock(struct file_lock *fl)
+void locks_free_lock(struct file_lock *fl)
 {
 	BUG_ON(waitqueue_active(&fl->fl_wait));
 	BUG_ON(!list_empty(&fl->fl_block));
···
 	locks_release_private(fl);
 	kmem_cache_free(filelock_cache, fl);
 }
+EXPORT_SYMBOL(locks_free_lock);
 
 void locks_init_lock(struct file_lock *fl)
 {

fs/nfs/file.c

···
 	dprintk("NFS: setlease(%s/%s, arg=%ld)\n",
 			file->f_path.dentry->d_parent->d_name.name,
 			file->f_path.dentry->d_name.name, arg);
-
+	if (arg != F_UNLCK)
+		locks_free_lock(*fl);
 	return -EINVAL;
 }

include/linux/fs.h

···
 extern int fcntl_getlease(struct file *filp);
 
 /* fs/locks.c */
+void locks_free_lock(struct file_lock *fl);
 extern void locks_init_lock(struct file_lock *);
 extern struct file_lock * locks_alloc_lock(void);
 extern void locks_copy_lock(struct file_lock *, struct file_lock *);