Status SimpleRecordStoreV1::truncate(OperationContext* txn) {
const DiskLoc firstExtLoc = _details->firstExtent(txn);
if (firstExtLoc.isNull() || !firstExtLoc.isValid()) {
// Already empty
return Status::OK();
}
// Free all extents except the first.
Extent* firstExt = _extentManager->getExtent(firstExtLoc);
if (!firstExt->xnext.isNull()) {
const DiskLoc extNextLoc = firstExt->xnext;
const DiskLoc oldLastExtLoc = _details->lastExtent(txn);
Extent* const nextExt = _extentManager->getExtent(extNextLoc);
// Unlink other extents;
*txn->recoveryUnit()->writing(&nextExt->xprev) = DiskLoc();
*txn->recoveryUnit()->writing(&firstExt->xnext) = DiskLoc();
_details->setLastExtent(txn, firstExtLoc);
_details->setLastExtentSize(txn, firstExt->length);
_extentManager->freeExtents(txn, extNextLoc, oldLastExtLoc);
}
// Make the first (now only) extent a single large deleted record.
*txn->recoveryUnit()->writing(&firstExt->firstRecord) = DiskLoc();
*txn->recoveryUnit()->writing(&firstExt->lastRecord) = DiskLoc();
_details->orphanDeletedList(txn);
addDeletedRec(txn, _findFirstSpot(txn, firstExtLoc, firstExt));
// Make stats reflect that there are now no documents in this record store.
_details->setStats(txn, 0, 0);
return Status::OK();
}
void RecordStoreV1Base::increaseStorageSize(OperationContext* txn, int size, bool enforceQuota) {
DiskLoc eloc = _extentManager->allocateExtent(txn, isCapped(), size, enforceQuota);
Extent* e = _extentManager->getExtent(eloc);
invariant(e);
*txn->recoveryUnit()->writing(&e->nsDiagnostic) = _ns;
txn->recoveryUnit()->writing(&e->xnext)->Null();
txn->recoveryUnit()->writing(&e->xprev)->Null();
txn->recoveryUnit()->writing(&e->firstRecord)->Null();
txn->recoveryUnit()->writing(&e->lastRecord)->Null();
DiskLoc emptyLoc = _findFirstSpot(txn, eloc, e);
if (_details->lastExtent(txn).isNull()) {
invariant(_details->firstExtent(txn).isNull());
_details->setFirstExtent(txn, eloc);
_details->setLastExtent(txn, eloc);
_details->setCapExtent(txn, eloc);
invariant(e->xprev.isNull());
invariant(e->xnext.isNull());
} else {
invariant(!_details->firstExtent(txn).isNull());
*txn->recoveryUnit()->writing(&e->xprev) = _details->lastExtent(txn);
*txn->recoveryUnit()->writing(
&_extentManager->getExtent(_details->lastExtent(txn))->xnext) = eloc;
_details->setLastExtent(txn, eloc);
}
_details->setLastExtentSize(txn, e->length);
addDeletedRec(txn, emptyLoc);
}
