// bypass standard alloc/insert routines to use the extent we want.
static DiskLoc insert( const DiskLoc& ext, int i ) {
BSONObjBuilder b;
b.append( "a", i );
BSONObj o = b.done();
int len = o.objsize();
Extent *e = ext.ext();
e = getDur().writing(e);
int ofs;
if ( e->lastRecord.isNull() )
ofs = ext.getOfs() + ( e->_extentData - (char *)e );
else
ofs = e->lastRecord.getOfs() + e->lastRecord.rec()->lengthWithHeaders();
DiskLoc dl( ext.a(), ofs );
Record *r = dl.rec();
r = (Record*) getDur().writingPtr(r, Record::HeaderSize + len);
r->lengthWithHeaders() = Record::HeaderSize + len;
r->extentOfs() = e->myLoc.getOfs();
r->nextOfs() = DiskLoc::NullOfs;
r->prevOfs() = e->lastRecord.isNull() ? DiskLoc::NullOfs : e->lastRecord.getOfs();
memcpy( r->data(), o.objdata(), len );
if ( e->firstRecord.isNull() )
e->firstRecord = dl;
else
getDur().writingInt(e->lastRecord.rec()->nextOfs()) = ofs;
e->lastRecord = dl;
return dl;
}
void initializeV1RS(OperationContext* txn,
const LocAndSize* records,
const LocAndSize* drecs,
DummyExtentManager* em,
DummyRecordStoreV1MetaData* md) {
invariant(records || drecs); // if both are NULL nothing is being created...
// Need to start with a blank slate
invariant(em->numFiles() == 0);
invariant(md->firstExtent().isNull());
// pre-allocate extents (even extents that aren't part of this RS)
{
typedef std::map<int, size_t> ExtentSizes;
ExtentSizes extentSizes;
accumulateExtentSizeRequirements(records, &extentSizes);
accumulateExtentSizeRequirements(drecs, &extentSizes);
invariant(!extentSizes.empty());
const int maxExtent = extentSizes.rbegin()->first;
for (int i = 0; i <= maxExtent; i++) {
const size_t size = extentSizes.count(i) ? extentSizes[i] : 0;
const DiskLoc loc = em->allocateExtent(txn, md->isCapped(), size, 0);
// This function and assertState depend on these details of DummyExtentManager
invariant(loc.a() == i);
invariant(loc.getOfs() == 0);
}
// link together extents that should be part of this RS
md->setFirstExtent(txn, DiskLoc(extentSizes.begin()->first, 0));
md->setLastExtent(txn, DiskLoc(extentSizes.rbegin()->first, 0));
for (ExtentSizes::iterator it = extentSizes.begin();
boost::next(it) != extentSizes.end(); /* ++it */ ) {
const int a = it->first;
++it;
const int b = it->first;
em->getExtent(DiskLoc(a, 0))->xnext = DiskLoc(b, 0);
em->getExtent(DiskLoc(b, 0))->xprev = DiskLoc(a, 0);
}
// This signals "done allocating new extents".
if (md->isCapped())
md->setDeletedListEntry(txn, 1, DiskLoc());
}
if (records && !records[0].loc.isNull()) {
int recIdx = 0;
DiskLoc extLoc = md->firstExtent();
while (!extLoc.isNull()) {
Extent* ext = em->getExtent(extLoc);
int prevOfs = DiskLoc::NullOfs;
while (extLoc.a() == records[recIdx].loc.a()) { // for all records in this extent
const DiskLoc loc = records[recIdx].loc;
const int size = records[recIdx].size;;
invariant(size >= Record::HeaderSize);
md->incrementStats(txn, size - Record::HeaderSize, 1);
if (ext->firstRecord.isNull())
ext->firstRecord = loc;
Record* rec = em->recordForV1(loc);
rec->lengthWithHeaders() = size;
rec->extentOfs() = 0;
rec->prevOfs() = prevOfs;
prevOfs = loc.getOfs();
const DiskLoc nextLoc = records[recIdx + 1].loc;
if (nextLoc.a() == loc.a()) { // if next is in same extent
rec->nextOfs() = nextLoc.getOfs();
}
else {
rec->nextOfs() = DiskLoc::NullOfs;
ext->lastRecord = loc;
}
recIdx++;
}
extLoc = ext->xnext;
}
invariant(records[recIdx].loc.isNull());
}
if (drecs && !drecs[0].loc.isNull()) {
int drecIdx = 0;
DiskLoc* prevNextPtr = NULL;
int lastBucket = -1;
while (!drecs[drecIdx].loc.isNull()) {
const DiskLoc loc = drecs[drecIdx].loc;
const int size = drecs[drecIdx].size;
invariant(size >= Record::HeaderSize);
const int bucket = RecordStoreV1Base::bucket(size);
if (md->isCapped()) {
// All drecs form a single list in bucket 0
if (prevNextPtr == NULL) {
md->setDeletedListEntry(txn, 0, loc);
}
else {
*prevNextPtr = loc;
}
if (loc.a() < md->capExtent().a()
&& drecs[drecIdx + 1].loc.a() == md->capExtent().a()) {
// Bucket 1 is known as cappedLastDelRecLastExtent
md->setDeletedListEntry(txn, 1, loc);
}
}
else if (bucket != lastBucket) {
invariant(bucket > lastBucket); // if this fails, drecs weren't sorted by bucket
md->setDeletedListEntry(txn, bucket, loc);
lastBucket = bucket;
}
else {
*prevNextPtr = loc;
}
DeletedRecord* drec = &em->recordForV1(loc)->asDeleted();
drec->lengthWithHeaders() = size;
drec->extentOfs() = 0;
drec->nextDeleted() = DiskLoc();
prevNextPtr = &drec->nextDeleted();
drecIdx++;
}
}
// Make sure we set everything up as requested.
assertStateV1RS(records, drecs, em, md);
}
Extent* ExtentManager::extentFor( const DiskLoc& loc ) const {
Record* record = recordFor( loc );
DiskLoc extentLoc( loc.a(), record->extentOfs() );
return getExtent( extentLoc );
}
DiskLoc MmapV1ExtentManager::extentLocForV1( const DiskLoc& loc ) const {
Record* record = recordForV1( loc );
return DiskLoc( loc.a(), record->extentOfs() );
}