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Btrfs: Check for a blocking lock before taking the spin
authorChris Mason <chris.mason@oracle.com>
Fri, 13 Mar 2009 00:12:45 +0000 (20:12 -0400)
committerChris Mason <chris.mason@oracle.com>
Tue, 24 Mar 2009 20:14:27 +0000 (16:14 -0400)
This reduces contention on the extent buffer spin locks by testing for a
blocking lock before trying to take the spinlock.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

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