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xfs: remove incorrect log write optimization 

We do need a barrier for the first buffer of a split log write.
Otherwise we might incorrectly stamp the tail LSN into transactions
in the first part of the split write, or not flush data I/O before
updating the inode size.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig 2010-06-28 10:34:34 -04:00 committed by Alex Elder
parent 2727ccc950
commit 651701d71d
1 changed files with 2 additions and 5 deletions
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7
fs/xfs/xfs_log.c
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@ -1423,11 +1423,8 @@ xlog_sync(xlog_t *log,
XFS_BUF_BUSY(bp); XFS_BUF_BUSY(bp);
XFS_BUF_ASYNC(bp); XFS_BUF_ASYNC(bp);
bp->b_flags |= XBF_LOG_BUFFER; bp->b_flags |= XBF_LOG_BUFFER;
/*
* Do an ordered write for the log block. if (log->l_mp->m_flags & XFS_MOUNT_BARRIER)
* Its unnecessary to flush the first split block in the log wrap case.
*/
if (!split && (log->l_mp->m_flags & XFS_MOUNT_BARRIER))
XFS_BUF_ORDERED(bp); XFS_BUF_ORDERED(bp);
ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1);