Symbol: BO_WWAIT
sys/kern/vfs_bio.c
5230
if ((--bo->bo_numoutput == 0) && (bo->bo_flag & BO_WWAIT)) {
sys/kern/vfs_bio.c
5231
bo->bo_flag &= ~BO_WWAIT;
sys/kern/vfs_bio.c
5246
bo->bo_flag |= BO_WWAIT;