From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail105.syd.optusnet.com.au ([211.29.132.249]:44651 "EHLO mail105.syd.optusnet.com.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726953AbfDWWC2 (ORCPT ); Tue, 23 Apr 2019 18:02:28 -0400 Date: Wed, 24 Apr 2019 08:02:17 +1000 From: Dave Chinner Subject: Re: [PATCH v6 6/6] xfs: disable map_sync for async flush Message-ID: <20190423220217.GA29573@dread.disaster.area> References: <20190423080612.15361-1-pagupta@redhat.com> <20190423080612.15361-7-pagupta@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190423080612.15361-7-pagupta@redhat.com> Sender: linux-xfs-owner@vger.kernel.org List-ID: List-Id: xfs To: Pankaj Gupta Cc: linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, kvm@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-acpi@vger.kernel.org, qemu-devel@nongnu.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, dan.j.williams@intel.com, zwisler@kernel.org, vishal.l.verma@intel.com, dave.jiang@intel.com, mst@redhat.com, jasowang@redhat.com, willy@infradead.org, rjw@rjwysocki.net, hch@infradead.org, lenb@kernel.org, jack@suse.cz, tytso@mit.edu, adilger.kernel@dilger.ca, darrick.wong@oracle.com, lcapitulino@redhat.com, kwolf@redhat.com, imammedo@redhat.com, jmoyer@redhat.com, nilal@redhat.com, riel@surriel.com, stefanha@redhat.com, aarcange@redhat.com, david@redhat.com, cohuck@redhat.com, xiaoguangrong.eric@gmail.com, pbonzini@redhat.com, yuval.shaia@oracle.com, kilobyte@angband.pl On Tue, Apr 23, 2019 at 01:36:12PM +0530, Pankaj Gupta wrote: > Dont support 'MAP_SYNC' with non-DAX files and DAX files > with asynchronous dax_device. Virtio pmem provides > asynchronous host page cache flush mechanism. We don't > support 'MAP_SYNC' with virtio pmem and xfs. > > Signed-off-by: Pankaj Gupta > --- > fs/xfs/xfs_file.c | 10 ++++++---- > 1 file changed, 6 insertions(+), 4 deletions(-) > > diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c > index 1f2e2845eb76..0e59be018511 100644 > --- a/fs/xfs/xfs_file.c > +++ b/fs/xfs/xfs_file.c > @@ -1196,11 +1196,13 @@ xfs_file_mmap( > struct file *filp, > struct vm_area_struct *vma) > { > - /* > - * We don't support synchronous mappings for non-DAX files. At least > - * until someone comes with a sensible use case. > + struct dax_device *dax_dev = xfs_find_daxdev_for_inode > + (file_inode(filp)); > + > + /* We don't support synchronous mappings for non-DAX files and > + * for DAX files if underneath dax_device is not synchronous. > */ /* * This is the correct multi-line comment format. Please * update the patch to maintain the existing comment format. */ Cheers, Dave. -- Dave Chinner david@fromorbit.com