From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga07.intel.com ([134.134.136.100]:31168 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965652AbdIYXOd (ORCPT ); Mon, 25 Sep 2017 19:14:33 -0400 From: Ross Zwisler Subject: [PATCH 7/7] xfs: re-enable XFS per-inode DAX Date: Mon, 25 Sep 2017 17:14:04 -0600 Message-Id: <20170925231404.32723-8-ross.zwisler@linux.intel.com> In-Reply-To: <20170925231404.32723-1-ross.zwisler@linux.intel.com> References: <20170925231404.32723-1-ross.zwisler@linux.intel.com> Sender: linux-xfs-owner@vger.kernel.org List-ID: List-Id: xfs To: Andrew Morton , linux-kernel@vger.kernel.org Cc: Ross Zwisler , "Darrick J. Wong" , "J. Bruce Fields" , Christoph Hellwig , Dan Williams , Dave Chinner , Jan Kara , Jeff Layton , linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-nvdimm@lists.01.org, linux-xfs@vger.kernel.org Re-enable the XFS per-inode DAX flag, preventing S_DAX from changing when any mappings are present. Signed-off-by: Ross Zwisler --- fs/xfs/xfs_ioctl.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index 386b437..7a24dd5 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -1012,12 +1012,10 @@ xfs_diflags_to_linux( inode->i_flags |= S_NOATIME; else inode->i_flags &= ~S_NOATIME; -#if 0 /* disabled until the flag switching races are sorted out */ if ((xflags & FS_XFLAG_DAX) || (ip->i_mount->m_flags & XFS_MOUNT_DAX)) inode->i_flags |= S_DAX; else inode->i_flags &= ~S_DAX; -#endif } static bool @@ -1049,6 +1047,8 @@ xfs_ioctl_setattr_xflags( { struct xfs_mount *mp = ip->i_mount; uint64_t di_flags2; + struct address_space *mapping = VFS_I(ip)->i_mapping; + bool dax_changing; /* Can't change realtime flag if any extents are allocated. */ if ((ip->i_d.di_nextents || ip->i_delayed_blks) && @@ -1084,10 +1084,23 @@ xfs_ioctl_setattr_xflags( if (di_flags2 && ip->i_d.di_version < 3) return -EINVAL; + dax_changing = xfs_is_dax_state_changing(fa->fsx_xflags, ip); + if (dax_changing) { + i_mmap_lock_read(mapping); + if (mapping_mapped(mapping)) { + i_mmap_unlock_read(mapping); + return -EBUSY; + } + } + ip->i_d.di_flags = xfs_flags2diflags(ip, fa->fsx_xflags); ip->i_d.di_flags2 = di_flags2; xfs_diflags_to_linux(ip); + + if (dax_changing) + i_mmap_unlock_read(mapping); + xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG); xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); XFS_STATS_INC(mp, xs_ig_attrchg); -- 2.9.5