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H A Dctree.cdiff 240f62c8756df285da11469259b3900f32883168 Wed Mar 23 13:54:42 CDT 2011 Chris Mason <chris.mason@oracle.com> Btrfs: use RCU instead of a spinlock to protect the root node

The pointer to the extent buffer for the root of each tree
is protected by a spinlock so that we can safely read the pointer
and take a reference on the extent buffer.

But now that the extent buffers are freed via RCU, we can safely
use rcu_read_lock instead.

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