From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2B538C04EBE for ; Thu, 8 Oct 2020 07:55:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B9DD121897 for ; Thu, 8 Oct 2020 07:55:08 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="s5am6itE" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728935AbgJHHzH (ORCPT ); Thu, 8 Oct 2020 03:55:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52102 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728851AbgJHHy7 (ORCPT ); Thu, 8 Oct 2020 03:54:59 -0400 Received: from mail-pg1-x542.google.com (mail-pg1-x542.google.com [IPv6:2607:f8b0:4864:20::542]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5948BC0613D5; Thu, 8 Oct 2020 00:54:58 -0700 (PDT) Received: by mail-pg1-x542.google.com with SMTP id h6so3595154pgk.4; Thu, 08 Oct 2020 00:54:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=uRaztcCJnlOoX6i9scY25dALTRO/x6REIkOSQ8S7jV8=; b=s5am6itE5ChGCgbRnNVLHpQK3th4boGgvEyz/+NCiS/yVET+IQvmz+R7EGHO/mDQxu D6QKxsonLgPo5UaJ5jajc5nvXTMqkP9BsLSZ+G2OQtxFjEocWZc3ja5hXZZSByAASU9f T9P3CvPF7HkFcUaAHkROPIzZyu4ZASaPuuaPA+cY7/LUOrvd7OlgqxQGkLZXT6PcNUPI 6Bb9pcCgbv2ayWI+WAdFai8nslKRJSO79E7n36X70DvCPLAfLW9x9bnemZMh45jd3Qpj rQWRceAcpwlVyXqe9Bm42qUm44gv23i12iV1YgOtKTOlcOMvVF7/qobS4kSTeBSloJOX exIg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=uRaztcCJnlOoX6i9scY25dALTRO/x6REIkOSQ8S7jV8=; b=YqjIjE8JLG/awOH4Y4eayVD9OTp2Wr/kerXlMKYaDF/SVRXF6LdTW5AjHBxpKTXsIJ 1RXMUOY6i453X0NeEDF4cxFVo3cMIBcpu3rslL9rjdLOVFNSNdPhJqn2fYmWbiEkx6J3 8Kv19S6DuH+YtGyEcgYsedfqOmrGSUOmq/GXrGXhXWpaI6hcgpQGji6GHc7tCYS1felJ eF/j5r4Gyk4UoG2FxZweBZVTGbe3uAmD0PN5JMXARxQJweLvBMy6xIXXm9yShO6az9rx PKHZTcgZi8c45X0KXnmo3PeGl9dgJMAhIBNGvylPPNA+7IhYzDDQVqP48bsJPS+JFiNd FW0w== X-Gm-Message-State: AOAM531rFUKXoSjfl9nt3me3TopbF5RF1+Smc4YstiVjzhcX5ABuQiHH AsRfBwlrSua0nNQVgxKf1rU= X-Google-Smtp-Source: ABdhPJxmneky4Nkjo5WcAH3W3ovFYU42Ol4bsicbBn4KnNNC4bw5RMfh4unJXvihHs0zVvq7rxpVdQ== X-Received: by 2002:a62:93:0:b029:13e:d13d:a085 with SMTP id 141-20020a6200930000b029013ed13da085mr6187059pfa.28.1602143697958; Thu, 08 Oct 2020 00:54:57 -0700 (PDT) Received: from localhost.localdomain ([203.205.141.61]) by smtp.gmail.com with ESMTPSA id k206sm6777106pfd.126.2020.10.08.00.54.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Oct 2020 00:54:57 -0700 (PDT) From: yulei.kernel@gmail.com X-Google-Original-From: yuleixzhang@tencent.com To: akpm@linux-foundation.org, naoya.horiguchi@nec.com, viro@zeniv.linux.org.uk, pbonzini@redhat.com Cc: linux-fsdevel@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, xiaoguangrong.eric@gmail.com, kernellwp@gmail.com, lihaiwei.kernel@gmail.com, Yulei Zhang , Chen Zhuo Subject: [PATCH 16/35] dmemfs: introduce ->split() to dmemfs_vm_ops Date: Thu, 8 Oct 2020 15:54:06 +0800 Message-Id: X-Mailer: git-send-email 2.17.1 In-Reply-To: References: In-Reply-To: References: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Yulei Zhang It is required by __split_vma() to adjust vma. munmap() which create hole unaligned to pagesize in dmemfs-mapping should be forbidden. Signed-off-by: Chen Zhuo Signed-off-by: Yulei Zhang --- fs/dmemfs/inode.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/fs/dmemfs/inode.c b/fs/dmemfs/inode.c index 6932d73edab6..e37498c00497 100644 --- a/fs/dmemfs/inode.c +++ b/fs/dmemfs/inode.c @@ -453,6 +453,13 @@ dmemfs_access_dmem(struct vm_area_struct *vma, unsigned long addr, return len; } +static int dmemfs_split(struct vm_area_struct *vma, unsigned long addr) +{ + if (addr & (dmem_page_size(file_inode(vma->vm_file)) - 1)) + return -EINVAL; + return 0; +} + static vm_fault_t dmemfs_fault(struct vm_fault *vmf) { struct vm_area_struct *vma = vmf->vma; @@ -487,6 +494,7 @@ static unsigned long dmemfs_pagesize(struct vm_area_struct *vma) } static const struct vm_operations_struct dmemfs_vm_ops = { + .split = dmemfs_split, .fault = dmemfs_fault, .pagesize = dmemfs_pagesize, .access = dmemfs_access_dmem, -- 2.28.0