Block*
dataBlock(uchar score[VtScoreSize], uint type, uint tag)
{
Block *b, *bl;
int lpb;
Label l;
u32int addr;
addr = globalToLocal(score);
if(addr == NilBlock)
return ventiBlock(score, type);
lpb = h.blockSize/LabelSize;
bl = readBlock(PartLabel, addr/lpb);
if(bl == nil)
return nil;
if(!labelUnpack(&l, bl->data, addr%lpb)) {
werrstr("%r");
blockPut(bl);
return nil;
}
blockPut(bl);
if(l.type != type) {
werrstr("type mismatch; got %d (%s) wanted %d (%s)",
l.type, btStr(l.type), type, btStr(type));
return nil;
}
if(tag && l.tag != tag) {
werrstr("tag mismatch; got 0x%.8ux wanted 0x%.8ux",
l.tag, tag);
return nil;
}
b = readBlock(PartData, addr);
if(b == nil)
return nil;
b->l = l;
return b;
}
static u32int
blockAlloc(int type, u32int tag)
{
static u32int addr;
Label l;
int lpb;
lpb = bsize/LabelSize;
blockRead(PartLabel, addr/lpb);
if(!labelUnpack(&l, buf, addr % lpb))
vtFatal("bad label: %r");
if(l.state != BsFree)
vtFatal("want to allocate block already in use");
l.epoch = 1;
l.epochClose = ~(u32int)0;
l.type = type;
l.state = BsAlloc;
l.tag = tag;
labelPack(&l, buf, addr % lpb);
blockWrite(PartLabel, addr/lpb);
return addr++;
}
