xfs: flush data dev on external log write

We incorrectly flush the log device instead of the data device when
trying to ensure metadata is correctly on disk before writing the
unmount record.

Fixes: eef983ffeae7 ("xfs: journal IO cache flush reductions")
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>

diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 36fa2650b0813fdbec34da1dc87ba82a27c05547..96434cc4df6e5d57cf0fb24ba1870841a988ccdd 100644 (file)
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -833,7 +833,7 @@ xlog_write_unmount_record(
         * stamp the tail LSN into the unmount record.
         */
        if (log->l_targ != log->l_mp->m_ddev_targp)
-               blkdev_issue_flush(log->l_targ->bt_bdev);
+               blkdev_issue_flush(log->l_mp->m_ddev_targp->bt_bdev);
        return xlog_write(log, &vec, ticket, NULL, NULL, XLOG_UNMOUNT_TRANS);
 }