tree 9343db596aec175e9640aa2800b80f01496d7047
parent 1c2308f8e7d8491467e0095af2b01500f1b70819
author Zheng Yan <zheng.yan@oracle.com> 1222190054 -0400
committer Chris Mason <chris.mason@oracle.com> 1222355047 -0400

Btrfs: Full back reference support

This patch makes the back reference system to explicit record the
location of parent node for all types of extents. The location of
parent node is placed into the offset field of backref key. Every
time a tree block is balanced, the back references for the affected
lower level extents are updated.

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