ovl: set I_CREATING on inode being created

...otherwise there will be list corruption due to inode_sb_list_add() being
called for inode already on the sb list.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Fixes: e950564 ("vfs: don't evict uninitialized inode")
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/overlayfs/dir.c

@@ -603,6 +603,10 @@ static int ovl_create_object(struct dentry *dentry, int mode, dev_t rdev,
 	if (!inode)
 		goto out_drop_write;
 
+	spin_lock(&inode->i_lock);
+	inode->i_state |= I_CREATING;
+	spin_unlock(&inode->i_lock);
+
 	inode_init_owner(inode, dentry->d_parent->d_inode, mode);
 	attr.mode = inode->i_mode;