dbAllocAG
rc = dbAllocAG(bmp, agno, nblocks, l2nb, &blkno);
static int dbAllocAG(struct bmap * bmp, int agno, s64 nblocks, int l2nb,
if ((rc = dbAllocAG(bmp, agno, nblocks, l2nb, results)) != -ENOSPC)
if ((rc = dbAllocAG(bmp, agno, nblocks, l2nb, results)) == -ENOSPC)