From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:60484 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725935AbfDCKmg (ORCPT ); Wed, 3 Apr 2019 06:42:36 -0400 From: Pankaj Gupta Subject: [PATCH v4 5/5] xfs: disable map_sync for async flush Date: Wed, 3 Apr 2019 16:10:18 +0530 Message-Id: <20190403104018.23947-6-pagupta@redhat.com> In-Reply-To: <20190403104018.23947-1-pagupta@redhat.com> References: <20190403104018.23947-1-pagupta@redhat.com> Sender: linux-xfs-owner@vger.kernel.org List-ID: List-Id: xfs To: 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 Cc: 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, david@fromorbit.com, cohuck@redhat.com, xiaoguangrong.eric@gmail.com, pagupta@redhat.com 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 | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 1f2e2845eb76..dced2eb8c91a 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -1203,6 +1203,14 @@ xfs_file_mmap( if (!IS_DAX(file_inode(filp)) && (vma->vm_flags & VM_SYNC)) return -EOPNOTSUPP; + /* We don't support synchronous mappings with DAX files if + * dax_device is not synchronous. + */ + if (IS_DAX(file_inode(filp)) && !dax_synchronous( + xfs_find_daxdev_for_inode(file_inode(filp))) && + (vma->vm_flags & VM_SYNC)) + return -EOPNOTSUPP; + file_accessed(filp); vma->vm_ops = &xfs_file_vm_ops; if (IS_DAX(file_inode(filp))) -- 2.20.1