Btrfs: init relocate extent_io_tree with a mapping
authorJosef Bacik <jbacik@fusionio.com>
Fri, 31 May 2013 17:04:36 +0000 (13:04 -0400)
committerChris Mason <chris.mason@fusionio.com>
Sat, 8 Jun 2013 19:07:53 +0000 (15:07 -0400)
commita9995eece39a0630ebbfc1ab38570bce6c8a8f5b
tree1dab3bca657f98015fed634bf08e2cc9742741f6
parent6379ef9fb2482a92b5fe09f927d6ce1f989c0c6d
Btrfs: init relocate extent_io_tree with a mapping

Dave reported a NULL pointer deref.  This is caused because he thought he'd be
smart and add sanity checks to the extent_io bit operations, but he didn't
expect a tree to have a NULL mapping.  To fix this we just need to init the
relocation's processed_blocks with the btree_inode->i_mapping.  Thanks,

Reported-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
fs/btrfs/relocation.c