Commits
Li Zefan committed 4d2c8f62f12
Btrfs: clean up code for merging extent maps unpin_extent_cache() and add_extent_mapping() shares the same code that merges extent maps. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>