void
sumarena(Arena *arena)
{
ZBlock *b;
DigestState s;
uint64_t a, e;
uint32_t bs;
int t;
uint8_t score[VtScoreSize];
bs = MaxIoSize;
if(bs < arena->blocksize)
bs = arena->blocksize;
/*
* read & sum all blocks except the last one
*/
flushdcache();
memset(&s, 0, sizeof s);
b = alloczblock(bs, 0, arena->part->blocksize);
e = arena->base + arena->size;
for(a = arena->base - arena->blocksize; a + arena->blocksize <= e; a += bs){
disksched();
while((t=arenasumsleeptime) == SleepForever){
sleep(1000);
disksched();
}
sleep(t);
if(a + bs > e)
bs = arena->blocksize;
if(readpart(arena->part, a, b->data, bs) < 0)
goto ReadErr;
addstat(StatSumRead, 1);
addstat(StatSumReadBytes, bs);
sha1(b->data, bs, nil, &s);
}
/*
* the last one is special, since it may already have the checksum included
*/
bs = arena->blocksize;
if(readpart(arena->part, e, b->data, bs) < 0){
ReadErr:
logerr(EOk, "sumarena can't sum %s, read at %lld failed: %r", arena->name, a);
freezblock(b);
return;
}
addstat(StatSumRead, 1);
addstat(StatSumReadBytes, bs);
sha1(b->data, bs-VtScoreSize, nil, &s);
sha1(zeroscore, VtScoreSize, nil, &s);
sha1(nil, 0, score, &s);
/*
* check for no checksum or the same
*/
if(scorecmp(score, &b->data[bs - VtScoreSize]) != 0
&& scorecmp(zeroscore, &b->data[bs - VtScoreSize]) != 0)
logerr(EOk, "overwriting mismatched checksums for arena=%s, found=%V calculated=%V",
arena->name, &b->data[bs - VtScoreSize], score);
freezblock(b);
qlock(&arena->lock);
scorecp(arena->score, score);
wbarena(arena);
qunlock(&arena->lock);
}
static int
icachewritesect(Index *ix, ISect *is, u8int *buf)
{
int err, i, werr, h, bsize, t;
u32int lo, hi;
u64int addr, naddr;
uint nbuf, off;
DBlock *b;
IBucket ib;
IEntry *ie, *iedirty, **l, *chunk;
lo = is->start * ix->div;
if(TWID32/ix->div < is->stop)
hi = TWID32;
else
hi = is->stop * ix->div - 1;
trace(TraceProc, "icachewritesect enter %ud %ud %llud",
lo, hi, iwrite.as.aa);
iedirty = icachedirty(lo, hi, iwrite.as.aa);
iedirty = iesort(iedirty);
bsize = 1 << is->blocklog;
err = 0;
while(iedirty){
disksched();
while((t = icachesleeptime) == SleepForever){
sleep(1000);
disksched();
}
if(t < minicachesleeptime)
t = minicachesleeptime;
if(t > 0)
sleep(t);
trace(TraceProc, "icachewritesect nextchunk");
chunk = nextchunk(ix, is, &iedirty, &addr, &nbuf);
trace(TraceProc, "icachewritesect readpart 0x%llux+0x%ux",
addr, nbuf);
if(readpart(is->part, addr, buf, nbuf) < 0){
fprint(2, "%s: part %s addr 0x%llux: icachewritesect "
"readpart: %r\n", argv0, is->part->name, addr);
err = -1;
continue;
}
trace(TraceProc, "icachewritesect updatebuf");
addstat(StatIsectReadBytes, nbuf);
addstat(StatIsectRead, 1);
for(l=&chunk; (ie=*l)!=nil; l=&ie->nextdirty){
again:
naddr = ie2diskaddr(ix, is, ie);
off = naddr - addr;
if(off+bsize > nbuf){
fprint(2, "%s: whoops! addr=0x%llux nbuf=%ud "
"addr+nbuf=0x%llux naddr=0x%llux\n",
argv0, addr, nbuf, addr+nbuf, naddr);
assert(off+bsize <= nbuf);
}
unpackibucket(&ib, buf+off, is->bucketmagic);
if(okibucket(&ib, is) < 0){
fprint(2, "%s: bad bucket XXX\n", argv0);
goto skipit;
}
trace(TraceProc, "icachewritesect add %V at 0x%llux",
ie->score, naddr);
h = bucklook(ie->score, ie->ia.type, ib.data, ib.n);
if(h & 1){
h ^= 1;
packientry(ie, &ib.data[h]);
}else if(ib.n < is->buckmax){
memmove(&ib.data[h + IEntrySize], &ib.data[h],
ib.n*IEntrySize - h);
ib.n++;
packientry(ie, &ib.data[h]);
}else{
fprint(2, "%s: bucket overflow XXX\n", argv0);
skipit:
err = -1;
*l = ie->nextdirty;
ie = *l;
if(ie)
goto again;
else
break;
}
packibucket(&ib, buf+off, is->bucketmagic);
}
diskaccess(1);
trace(TraceProc, "icachewritesect writepart", addr, nbuf);
werr = 0;
if(writepart(is->part, addr, buf, nbuf) < 0 || flushpart(is->part) < 0)
werr = -1;
for(i=0; i<nbuf; i+=bsize){
if((b = _getdblock(is->part, addr+i, ORDWR, 0)) != nil){
memmove(b->data, buf+i, bsize);
putdblock(b);
}
}
if(werr < 0){
fprint(2, "%s: part %s addr 0x%llux: icachewritesect "
"writepart: %r\n", argv0, is->part->name, addr);
err = -1;
continue;
}
addstat(StatIsectWriteBytes, nbuf);
addstat(StatIsectWrite, 1);
icacheclean(chunk);
}
trace(TraceProc, "icachewritesect done");
return err;
}