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[PATCH 0/2] splice: fix direct IO/splice deadlock

To: linux-fsdevel@xxxxxxxxxxxxxxx
Subject: [PATCH 0/2] splice: fix direct IO/splice deadlock
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Wed, 28 Nov 2012 13:12:46 +1100
Cc: xfs@xxxxxxxxxxx
Hi Folks,

These two patches have been sitting in my tree for some time. I think I've even
posted them before. Basically, XFS can deadlock when you use splice and direct
IO on the same file concurrently because the splice write inverts the locking
order of the i_mutex and the xfs inode i_iolock. The first patch moves the guts
of the i_mutex protected region of the splice write to an actor function, and
the second uses this structure to enable XFS to provide an actor that uses the
correct locking order and hence avoid the deadlock.




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