• Filipe Manana's avatar
    Btrfs: correctly get tree level in tree_backref_for_extent · a1317f45
    Filipe Manana authored
    If we are using skinny metadata, the block's tree level is in the offset
    of the key and not in a btrfs_tree_block_info structure following the
    extent item (it doesn't exist). Therefore fix it.
    
    Besides returning the correct level in the tree, this also prevents reading
    past the leaf's end in the case where the extent item is the last item in
    the leaf (eb) and it has only 1 inline reference - this is because
    sizeof(struct btrfs_tree_block_info) is greater than
    sizeof(struct btrfs_extent_inline_ref).
    
    Got it while running a scrub which produced the following warning:
    
        BTRFS: checksum error at logical 42123264 on dev /dev/sde, sector 15840: metadata node (level 24) in tree 5
    Signed-off-by: default avatarFilipe Manana <fdmanana@suse.com>
    Reviewed-by: default avatarSatoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
    Signed-off-by: default avatarChris Mason <clm@fb.com>
    a1317f45
backref.c 50.3 KB