void NamespaceDetails::emptyCappedCollection( const char *ns ) {
DEV verify( this == nsdetails(ns) );
massert( 13424, "collection must be capped", capped );
massert( 13425, "background index build in progress", !indexBuildInProgress );
massert( 13426, "indexes present", nIndexes == 0 );
// Clear all references to this namespace.
ClientCursor::invalidate( ns );
NamespaceDetailsTransient::clearForPrefix( ns );
// Get a writeable reference to 'this' and reset all pertinent
// attributes.
NamespaceDetails *t = writingWithoutExtra();
t->cappedLastDelRecLastExtent() = DiskLoc();
t->cappedListOfAllDeletedRecords() = DiskLoc();
// preserve firstExtent/lastExtent
t->capExtent = firstExtent;
t->stats.datasize = stats.nrecords = 0;
// lastExtentSize preserve
// nIndexes preserve 0
// capped preserve true
// max preserve
t->paddingFactor = 1.0;
t->flags = 0;
t->capFirstNewRecord = DiskLoc();
t->capFirstNewRecord.setInvalid();
t->cappedLastDelRecLastExtent().setInvalid();
// dataFileVersion preserve
// indexFileVersion preserve
t->multiKeyIndexBits = 0;
t->reservedA = 0;
t->extraOffset = 0;
// indexBuildInProgress preserve 0
memset(t->reserved, 0, sizeof(t->reserved));
// Reset all existing extents and recreate the deleted list.
for( DiskLoc ext = firstExtent; !ext.isNull(); ext = ext.ext()->xnext ) {
DiskLoc prev = ext.ext()->xprev;
DiskLoc next = ext.ext()->xnext;
DiskLoc empty = ext.ext()->reuse( ns, true );
ext.ext()->xprev.writing() = prev;
ext.ext()->xnext.writing() = next;
addDeletedRec( empty.drec(), empty );
}
}
void NamespaceDetails::emptyCappedCollection( const char *ns ) {
DEV verify( this == nsdetails(ns) );
massert( 13424, "collection must be capped", isCapped() );
massert( 13425, "background index build in progress", !_indexBuildsInProgress );
vector<BSONObj> indexes = Helpers::findAll( Namespace( ns ).getSisterNS( "system.indexes" ) , BSON( "ns" << ns ) );
for ( unsigned i=0; i<indexes.size(); i++ ) {
indexes[i] = indexes[i].copy();
}
if ( _nIndexes ) {
string errmsg;
BSONObjBuilder note;
bool res = dropIndexes( this , ns , "*" , errmsg , note , true );
massert( 13426 , str::stream() << "failed during index drop: " << errmsg , res );
}
// Clear all references to this namespace.
ClientCursor::invalidate( ns );
NamespaceDetailsTransient::resetCollection( ns );
// Get a writeable reference to 'this' and reset all pertinent
// attributes.
NamespaceDetails *t = writingWithoutExtra();
t->cappedLastDelRecLastExtent() = DiskLoc();
t->cappedListOfAllDeletedRecords() = DiskLoc();
// preserve firstExtent/lastExtent
t->_capExtent = _firstExtent;
t->_stats.datasize = _stats.nrecords = 0;
// lastExtentSize preserve
// nIndexes preserve 0
// capped preserve true
// max preserve
t->_paddingFactor = 1.0;
t->_systemFlags = 0;
t->_capFirstNewRecord = DiskLoc();
t->_capFirstNewRecord.setInvalid();
t->cappedLastDelRecLastExtent().setInvalid();
// dataFileVersion preserve
// indexFileVersion preserve
t->_multiKeyIndexBits = 0;
t->_reservedA = 0;
t->_extraOffset = 0;
// indexBuildInProgress preserve 0
memset(t->_reserved, 0, sizeof(t->_reserved));
// Reset all existing extents and recreate the deleted list.
for( DiskLoc ext = _firstExtent; !ext.isNull(); ext = ext.ext()->xnext ) {
DiskLoc prev = ext.ext()->xprev;
DiskLoc next = ext.ext()->xnext;
DiskLoc empty = ext.ext()->reuse( ns, true );
ext.ext()->xprev.writing() = prev;
ext.ext()->xnext.writing() = next;
addDeletedRec( empty.drec(), empty );
}
for ( unsigned i=0; i<indexes.size(); i++ ) {
theDataFileMgr.insertWithObjMod(Namespace( ns ).getSisterNS( "system.indexes" ).c_str(),
indexes[i],
false,
true);
}
}