--- fs/9p/vfs_file.c

+++ fs/9p/vfs_file.c

@@ -114,7 +114,7 @@ static int v9fs_file_lock(struct file *f

P9_DPRINTK(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);

/* No mandatory locks */

- if (__mandatory_lock(inode))

+ if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)

return -ENOLCK;

if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {