Re: [PATCH] xfs: fix rt_dev usage for DAX
From: Darrick J. Wong <hidden>
Date: 2018-02-01 00:30:00
Also in:
nvdimm
On Wed, Jan 31, 2018 at 05:13:20PM -0700, Dave Jiang wrote:
quoted hunk ↗ jump to hunk
When using realtime device (rtdev) with xfs where the data device is not DAX capable, two issues arise. One is when data device is not DAX but the realtime device is DAX capable, we currently disable DAX. After passing this check, we are also not marking the inode as DAX capable. This change will allow DAX enabled if the data device or the realtime device is DAX capable. S_DAX will be marked for the inode if the file is residing on a DAX capable device. This will prevent the case of rtdev is not DAX and data device is DAX to create realtime files. Signed-off-by: Dave Jiang <dave.jiang@intel.com> Reported-by: Darrick Wong <redacted> --- fs/xfs/xfs_iops.c | 3 ++- fs/xfs/xfs_super.c | 2 +- 2 files changed, 3 insertions(+), 2 deletions(-)diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c index 56475fcd76f2..ab352c325301 100644 --- a/fs/xfs/xfs_iops.c +++ b/fs/xfs/xfs_iops.c@@ -1204,7 +1204,8 @@ xfs_diflags_to_iflags( ip->i_mount->m_sb.sb_blocksize == PAGE_SIZE && !xfs_is_reflink_inode(ip) && (ip->i_mount->m_flags & XFS_MOUNT_DAX || - ip->i_d.di_flags2 & XFS_DIFLAG2_DAX)) + ip->i_d.di_flags2 & XFS_DIFLAG2_DAX) && + blk_queue_dax(bdev_get_queue(inode->i_sb->s_bdev))) inode->i_flags |= S_DAX; }diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index 1dacccc367f8..2b2a02bcf72e 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c@@ -1653,7 +1653,7 @@ xfs_fs_fill_super( "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); error = bdev_dax_supported(sb, sb->s_blocksize); - if (error) { + if (error && !mp->m_rtdev_targp->bt_daxdev) {
Don't we have to do all the other __bdev_dax_supported checks on the rtdev too? It seems to want to check that dax_direct_access actually works before it commits to returning 0, and I don't see why you wouldn't do that for the dax rtdev too. --D
xfs_alert(mp, "DAX unsupported by block device. Turning off DAX."); mp->m_flags &= ~XFS_MOUNT_DAX; -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html