gbincore
if ((bp = gbincore(&vp->v_bufobj, lblkno)) != NULL) {
if ((bpa = gbincore(&vp->v_bufobj, lblkno)) == NULL)
bp = gbincore(bo, blkno);
rbp = gbincore(&vp->v_bufobj, lblkno+i);
if ((tbp = gbincore(&vp->v_bufobj, start_lbn)) == NULL ||
if ((tbp = gbincore(bo, start_lbn)) == NULL ||
nbp = gbincore(bo, lblkno);
struct buf *gbincore(struct bufobj *, daddr_t);
bp = gbincore(bo, lbn);
if ((origbp = gbincore(bp->b_bufobj, bp->b_lblkno)) == NULL)