tree a95bada9d991780e0611e94529e63c8178f4f3be
parent 902b22f341efa00be802418a0a8c57bddcd269a6
author Chris Mason <chris.mason@oracle.com> 1219236710 -0400
committer Chris Mason <chris.mason@oracle.com> 1222355046 -0400

Btrfs: Fix add_extent_mapping to check for duplicates across the whole range

add_extent_mapping was allowing the insertion of overlapping extents.
This never used to happen because it only inserted the extents from disk
and those were never overlapping.

But, with the data=ordered code, the disk and memory representations of the
file are not the same.  add_extent_mapping needs to ensure a new extent
does not overlap before it inserts.

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