[PATCH 06/20] xfs: don't use REQ_PREFLUSH for split log writes

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If we have to split a log write because it wraps the end of the log we
can't just use REQ_PREFLUSH to flush before the first log write,
as the writes might get reordered somewhere in the I/O stack.  Issue
a manual flush in that case so that the ordering of the two log I/Os
doesn't matter.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Dave Chinner <dchinner@xxxxxxxxxx>
---
 fs/xfs/xfs_log.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 3b82ca8ac9c8..646a190e5730 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -1941,7 +1941,7 @@ xlog_sync(
 	 * synchronously here; for an internal log we can simply use the block
 	 * layer state machine for preflushes.
 	 */
-	if (log->l_mp->m_logdev_targp != log->l_mp->m_ddev_targp)
+	if (log->l_mp->m_logdev_targp != log->l_mp->m_ddev_targp || split)
 		xfs_blkdev_issue_flush(log->l_mp->m_ddev_targp);
 	else
 		bp->b_flags |= XBF_FLUSH;
-- 
2.20.1




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