From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Date: Wed, 5 Sep 2018 09:53:36 -0400
From: "J. Bruce Fields" <bfields@fieldses.org>
To: Jeff Layton <jlayton@redhat.com>
Cc: =?utf-8?B?54Sm5pmT5Yas?= <milestonejxd@gmail.com>,
        R.E.Wolff@bitwizard.nl, linux-fsdevel@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: POSIX violation by writeback error
Message-ID: <20180905135336.GB22395@fieldses.org>
References: <CAJDTihzqn3whQ47uUOxGYk4Je4S10ehNEQCtfb=j--iCsdDqgQ@mail.gmail.com>
 <82ffc434137c2ca47a8edefbe7007f5cbecd1cca.camel@redhat.com>
 <CAJDTihw7T8WLme09W8VHCRfiALq4fxg1ZsywcSjn6hXsAw5wRw@mail.gmail.com>
 <cd137e88c9e882200c08c7336aa7b5a1c84a7ba3.camel@redhat.com>
 <20180904161203.GD17478@fieldses.org>
 <20180904162348.GN17123@BitWizard.nl>
 <20180904185411.GA22166@fieldses.org>
 <a9d586a8c520e52bad2396b93f8d5cb8a9fd2071.camel@redhat.com>
 <CAJDTihxE07BuXMBmShXuj=TbJCK1mq3ZMFMxP1-T=xjhPF5ySw@mail.gmail.com>
 <09ba078797a1327713e5c2d3111641246451c06e.camel@redhat.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <09ba078797a1327713e5c2d3111641246451c06e.camel@redhat.com>
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-fsdevel.vger.kernel.org>

On Wed, Sep 05, 2018 at 06:55:15AM -0400, Jeff Layton wrote:
> There is no requirement for a filesystem to flush data on close(). In
> fact, most local filesystems do not. NFS does, but that's because it has
> to in order to provide close-to-open cache consistency semantics.

And these days even NFS can delay writeback till after close thanks to
write delegations.

--b.