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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@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig 2019-06-28 19:27:21 -07:00 committed by Darrick J. Wong
parent 366fc4b898
commit 1f9489be02
1 changed files with 1 additions and 1 deletions
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2
fs/xfs/xfs_log.c
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@ -1904,7 +1904,7 @@ 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;