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Re: spurious -ENOSPC on XFS

To: Mikulas Patocka <mpatocka@xxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, xfs@xxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
Subject: Re: spurious -ENOSPC on XFS
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Thu, 22 Jan 2009 15:59:13 -0500
In-reply-to: <20090120232422.GF10158@disturbed>
References: <Pine.LNX.4.64.0901120509550.11089@xxxxxxxxxxxxxxxxxxxxxxxxxxx> <20090113214949.GN8071@disturbed> <Pine.LNX.4.64.0901132324070.16396@xxxxxxxxxxxxxxxxxxxxxxxxxxx> <20090118173144.GA1999@xxxxxxxxxxxxx> <Pine.LNX.4.64.0901201430250.4603@xxxxxxxxxxxxxxxxxxxxxxxxxxx> <20090120232422.GF10158@disturbed>
User-agent: Mutt/1.5.18 (2008-05-17)
On Wed, Jan 21, 2009 at 10:24:22AM +1100, Dave Chinner wrote:
> Right, so you need to use internal xfs sync functions that don't
> have these problems. That is:
>       error = xfs_sync_inodes(ip->i_mount, SYNC_DELWRI|SYNC_WAIT);
> will do a blocking flush of all the inodes without deadlocks occurring.
> Then you can remove the 500ms wait.

I've given this a try with Eric's testcase from #724 in the oss bugzilla,
but it's not enough yet.  I thinks that's because SYNC_WAIT is rather
meaningless for data writeout, and we need SYNC_IOWAIT instead.  The
patch below gets the testcase working for me:

Index: linux-2.6/fs/xfs/linux-2.6/xfs_sync.c
--- linux-2.6.orig/fs/xfs/linux-2.6/xfs_sync.c  2009-01-22 06:29:30.646141628 
+++ linux-2.6/fs/xfs/linux-2.6/xfs_sync.c       2009-01-22 21:57:53.073864570 
@@ -446,7 +446,9 @@ xfs_flush_device_work(
        void            *arg)
        struct inode    *inode = arg;
-       sync_blockdev(mp->m_super->s_bdev);
+       xfs_sync_inodes(mp, SYNC_DELWRI);
+       xfs_sync_inodes(mp, SYNC_DELWRI | SYNC_IOWAIT);

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