fs_active
fs->fs_active = space;
if (fs->fs_active != 0) {
free(fs->fs_active, M_DEVBUF);
fs->fs_active = 0;
fs->fs_active = NULL;
#define ACTIVECGNUM(fs, cg) ((fs)->fs_active[(cg) / (NBBY * sizeof(uint64_t))])
if ((fs)->fs_active) \
if ((fs)->fs_active) \
u_int *fs_active; /* (u) used by snapshots to track fs */