xfs_dec_fdblocks
error = xfs_dec_fdblocks(mp, hidden_space, true);
error = xfs_dec_fdblocks(mp, da_new - da_old, true);
error = xfs_dec_fdblocks(ip->i_mount, len, true);
error = xfs_dec_fdblocks(mp, hidden_space, true);
error = xfs_dec_fdblocks(mp, delta, true);
error = xfs_dec_fdblocks(mp, delta, true);
error = xfs_dec_fdblocks(mp, fdblocks, false);
error = xfs_dec_fdblocks(mp, indlen, false);
if (blocks && xfs_dec_fdblocks(tp->t_mountp, blocks, rsvd))
error = xfs_dec_fdblocks(mp, blocks, rsvd);