tree ffd9484c6e80f90bcf0c4da2f41dda57c8d6eac5
parent 7f366cfecfc126731f8ac505d72026d691dac79a
author Chris Mason <chris.mason@oracle.com> 1236903165 -0400
committer Chris Mason <chris.mason@oracle.com> 1237925667 -0400

Btrfs: Check for a blocking lock before taking the spin

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>