tree de7ac71aa9fa00d3ce2b1849c97733f37799900c
parent d43317dcd074818d4bd12ddd4184a29aff98907b
author Chris Mason <chris.mason@oracle.com> 1320623456 -0500
committer Chris Mason <chris.mason@oracle.com> 1320623456 -0500

Btrfs: check for a null fs root when writing to the backup root log

During log replay, can commit the transaction before the fs_root
pointers are setup, so we have to make sure they are not null before
trying to use them.

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