16 /* list of blocks (on disk) * This record is used to describe a set of filesystem blocks, * and is used with two type tags, WAPBL_WC_BLOCKS and * WAPBL_WC_REVOCATIONS. * * For WAPBL_WC_BLOCKS, a copy of each listed block can be found * starting at the next log device blocksize boundary. starting at * one log device block since the start of the record. This contains * the bulk of the filesystem journal data which is written using * these records before being written into the filesystem. * * The WAPBL_WC_REVOCATIONS record is used to indicate that any * previously listed blocks should not be written into the filesystem. * This is important so that deallocated and reallocated data blocks * do not get overwritten with stale data from the journal. The * revocation records do not contain a copy of any actual block data. */