From: Christoph Hellwig <hch@infradead.org>
To: xfs@oss.sgi.com
Subject: [PATCH] xfs: remove incorrect log write optimization
Date: Mon, 28 Jun 2010 10:34:34 -0400 [thread overview]
Message-ID: <20100628143434.GA5473@infradead.org> (raw)
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
block, or not flush data I/O before updating the inode size.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Index: xfs-dev/fs/xfs/xfs_log.c
===================================================================
--- xfs-dev.orig/fs/xfs/xfs_log.c 2010-06-28 11:51:30.423004228 +0200
+++ xfs-dev/fs/xfs/xfs_log.c 2010-06-28 11:52:52.559255519 +0200
@@ -1423,11 +1423,8 @@ xlog_sync(xlog_t *log,
XFS_BUF_BUSY(bp);
XFS_BUF_ASYNC(bp);
bp->b_flags |= XBF_LOG_BUFFER;
- /*
- * Do an ordered write for the log block.
- * Its unnecessary to flush the first split block in the log wrap case.
- */
- if (!split && (log->l_mp->m_flags & XFS_MOUNT_BARRIER))
+
+ if (log->l_mp->m_flags & XFS_MOUNT_BARRIER)
XFS_BUF_ORDERED(bp);
ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1);
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next reply other threads:[~2010-06-28 14:31 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-28 14:34 Christoph Hellwig [this message]
2010-07-09 16:13 ` [PATCH] xfs: remove incorrect log write optimization Christoph Hellwig
2010-07-12 3:30 ` Alex Elder
2010-07-12 16:04 ` Christoph Hellwig
2010-07-13 19:52 ` Alex Elder
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