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pdfile.cpp
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pdfile.cpp
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// pdfile.cpp
/**
* Copyright (C) 2008 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
todo:
_ table scans must be sequential, not next/prev pointers
_ coalesce deleted
_ disallow system* manipulations from the database.
*/
#include "mongo/pch.h"
#include "mongo/db/pdfile.h"
#include <algorithm>
#include <boost/filesystem/operations.hpp>
#include <list>
#include "mongo/base/counter.h"
#include "mongo/db/auth/authorization_manager.h"
#include "mongo/db/pdfile_private.h"
#include "mongo/db/background.h"
#include "mongo/db/btree.h"
#include "mongo/db/commands/server_status.h"
#include "mongo/db/curop-inl.h"
#include "mongo/db/db.h"
#include "mongo/db/dbhelpers.h"
#include "mongo/db/extsort.h"
#include "mongo/db/index_update.h"
#include "mongo/db/instance.h"
#include "mongo/db/kill_current_op.h"
#include "mongo/db/lasterror.h"
#include "mongo/db/memconcept.h"
#include "mongo/db/namespace-inl.h"
#include "mongo/db/ops/delete.h"
#include "mongo/db/repl.h"
#include "mongo/db/replutil.h"
#include "mongo/db/sort_phase_one.h"
#include "mongo/util/file.h"
#include "mongo/util/file_allocator.h"
#include "mongo/util/hashtab.h"
#include "mongo/util/mmap.h"
#include "mongo/util/processinfo.h"
namespace mongo {
BOOST_STATIC_ASSERT( sizeof(Extent)-4 == 48+128 );
BOOST_STATIC_ASSERT( sizeof(DataFileHeader)-4 == 8192 );
bool isValidNS( const StringData& ns ) {
// TODO: should check for invalid characters
size_t idx = ns.find( '.' );
if ( idx == string::npos )
return false;
if ( idx == ns.size() - 1 )
return false;
return true;
}
// TODO SERVER-4328
bool inDBRepair = false;
struct doingRepair {
doingRepair() {
verify( ! inDBRepair );
inDBRepair = true;
}
~doingRepair() {
inDBRepair = false;
}
};
SimpleMutex BackgroundOperation::m("bg");
map<string, unsigned> BackgroundOperation::dbsInProg;
set<string> BackgroundOperation::nsInProg;
bool BackgroundOperation::inProgForDb(const char *db) {
SimpleMutex::scoped_lock lk(m);
return dbsInProg[db] != 0;
}
bool BackgroundOperation::inProgForNs(const char *ns) {
SimpleMutex::scoped_lock lk(m);
return nsInProg.count(ns) != 0;
}
void BackgroundOperation::assertNoBgOpInProgForDb(const char *db) {
uassert(12586, "cannot perform operation: a background operation is currently running for this database",
!inProgForDb(db));
}
void BackgroundOperation::assertNoBgOpInProgForNs(const char *ns) {
uassert(12587, "cannot perform operation: a background operation is currently running for this collection",
!inProgForNs(ns));
}
BackgroundOperation::BackgroundOperation(const char *ns) : _ns(ns) {
SimpleMutex::scoped_lock lk(m);
dbsInProg[_ns.db]++;
nsInProg.insert(_ns.ns());
}
BackgroundOperation::~BackgroundOperation() {
SimpleMutex::scoped_lock lk(m);
dbsInProg[_ns.db]--;
nsInProg.erase(_ns.ns());
}
void BackgroundOperation::dump(stringstream& ss) {
SimpleMutex::scoped_lock lk(m);
if( nsInProg.size() ) {
ss << "\n<b>Background Jobs in Progress</b>\n";
for( set<string>::iterator i = nsInProg.begin(); i != nsInProg.end(); i++ )
ss << " " << *i << '\n';
}
for( map<string,unsigned>::iterator i = dbsInProg.begin(); i != dbsInProg.end(); i++ ) {
if( i->second )
ss << "database " << i->first << ": " << i->second << '\n';
}
}
/* ----------------------------------------- */
#ifdef _WIN32
string dbpath = "\\data\\db\\";
#else
string dbpath = "/data/db/";
#endif
const char FREELIST_NS[] = ".$freelist";
bool directoryperdb = false;
string repairpath;
string pidfilepath;
DataFileMgr theDataFileMgr;
DatabaseHolder _dbHolder;
int MAGIC = 0x1000;
DatabaseHolder& dbHolderUnchecked() {
return _dbHolder;
}
void addNewNamespaceToCatalog(const char *ns, const BSONObj *options = 0);
void ensureIdIndexForNewNs(const char *ns) {
if ( ( strstr( ns, ".system." ) == 0 || legalClientSystemNS( ns , false ) ) &&
strstr( ns, FREELIST_NS ) == 0 ) {
LOG( 1 ) << "adding _id index for collection " << ns << endl;
ensureHaveIdIndex( ns, false );
}
}
string getDbContext() {
stringstream ss;
Client * c = currentClient.get();
if ( c ) {
Client::Context * cx = c->getContext();
if ( cx ) {
Database *database = cx->db();
if ( database ) {
ss << database->name << ' ';
ss << cx->ns() << ' ';
}
}
}
return ss.str();
}
/*---------------------------------------------------------------------*/
// inheritable class to implement an operation that may be applied to all
// files in a database using _applyOpToDataFiles()
class FileOp {
public:
virtual ~FileOp() {}
// Return true if file exists and operation successful
virtual bool apply( const boost::filesystem::path &p ) = 0;
virtual const char * op() const = 0;
};
void _applyOpToDataFiles( const char *database, FileOp &fo, bool afterAllocator = false, const string& path = dbpath );
void _deleteDataFiles(const char *database) {
if ( directoryperdb ) {
FileAllocator::get()->waitUntilFinished();
MONGO_ASSERT_ON_EXCEPTION_WITH_MSG( boost::filesystem::remove_all( boost::filesystem::path( dbpath ) / database ), "delete data files with a directoryperdb" );
return;
}
class : public FileOp {
virtual bool apply( const boost::filesystem::path &p ) {
return boost::filesystem::remove( p );
}
virtual const char * op() const {
return "remove";
}
} deleter;
_applyOpToDataFiles( database, deleter, true );
}
int Extent::initialSize(int len) {
long long sz = len * 16;
if ( len < 1000 ) sz = len * 64;
if ( sz > 1000000000 )
sz = 1000000000;
int z = ((int)sz) & 0xffffff00;
verify( z > len );
return z;
}
void checkConfigNS(const char *ns) {
if ( cmdLine.configsvr &&
!( str::startsWith( ns, "config." ) || str::startsWith( ns, "admin." ) ) ) {
uasserted(14037, "can't create user databases on a --configsvr instance");
}
}
bool _userCreateNS(const char *ns, const BSONObj& options, string& err, bool *deferIdIndex) {
LOG(1) << "create collection " << ns << ' ' << options << endl;
if ( nsdetails(ns) ) {
err = "collection already exists";
return false;
}
checkConfigNS(ns);
long long size = Extent::initialSize(128);
{
BSONElement e = options.getField("size");
if ( e.isNumber() ) {
size = e.numberLong();
uassert( 10083 , "create collection invalid size spec", size > 0 );
size += 0xff;
size &= 0xffffffffffffff00LL;
if ( size < Extent::minSize() )
size = Extent::minSize();
}
}
bool newCapped = false;
long long mx = 0;
if( options["capped"].trueValue() ) {
newCapped = true;
BSONElement e = options.getField("max");
if ( e.isNumber() ) {
mx = e.numberLong();
uassert( 16495,
"max in a capped collection has to be < 2^31 or not set",
NamespaceDetails::validMaxCappedDocs(&mx) );
}
}
// $nExtents just for debug/testing.
BSONElement e = options.getField( "$nExtents" );
Database *database = cc().database();
if ( e.type() == Array ) {
// We create one extent per array entry, with size specified
// by the array value.
BSONObjIterator i( e.embeddedObject() );
while( i.more() ) {
BSONElement e = i.next();
int size = int( e.number() );
verify( size <= 0x7fffffff );
// $nExtents is just for testing - always allocate new extents
// rather than reuse existing extents so we have some predictibility
// in the extent size used by our tests
database->suitableFile( ns, (int) size, false, false )->createExtent( ns, (int) size, newCapped );
}
}
else if ( int( e.number() ) > 0 ) {
// We create '$nExtents' extents, each of size 'size'.
int nExtents = int( e.number() );
verify( size <= 0x7fffffff );
for ( int i = 0; i < nExtents; ++i ) {
verify( size <= 0x7fffffff );
// $nExtents is just for testing - always allocate new extents
// rather than reuse existing extents so we have some predictibility
// in the extent size used by our tests
database->suitableFile( ns, (int) size, false, false )->createExtent( ns, (int) size, newCapped );
}
}
else {
// This is the non test case, where we don't have a $nExtents spec.
while ( size > 0 ) {
const int max = Extent::maxSize();
const int min = Extent::minSize();
int desiredExtentSize = static_cast<int> (size > max ? max : size);
desiredExtentSize = static_cast<int> (desiredExtentSize < min ? min : desiredExtentSize);
desiredExtentSize &= 0xffffff00;
Extent *e = database->allocExtent( ns, desiredExtentSize, newCapped, true );
size -= e->length;
}
}
NamespaceDetails *d = nsdetails(ns);
verify(d);
bool ensure = true;
// respect autoIndexId if set. otherwise, create an _id index for all colls, except for
// capped ones in local w/o autoIndexID (reason for the exception is for the oplog and
// non-replicated capped colls)
if( options.hasField( "autoIndexId" ) ||
(newCapped && nsToDatabase( ns ) == "local" ) ) {
ensure = options.getField( "autoIndexId" ).trueValue();
}
if( ensure ) {
if( deferIdIndex )
*deferIdIndex = true;
else
ensureIdIndexForNewNs( ns );
}
if ( mx > 0 )
d->setMaxCappedDocs( mx );
bool isFreeList = strstr(ns, FREELIST_NS) != 0;
if( !isFreeList )
addNewNamespaceToCatalog(ns, options.isEmpty() ? 0 : &options);
if ( options["flags"].numberInt() ) {
d->replaceUserFlags( options["flags"].numberInt() );
}
return true;
}
/** { ..., capped: true, size: ..., max: ... }
@param deferIdIndex - if not not, defers id index creation. sets the bool value to true if we wanted to create the id index.
@return true if successful
*/
bool userCreateNS(const char *ns, BSONObj options, string& err, bool logForReplication, bool *deferIdIndex) {
const char *coll = strchr( ns, '.' ) + 1;
massert( 10356 , str::stream() << "invalid ns: " << ns , NamespaceString::validCollectionName(ns));
bool ok = _userCreateNS(ns, options, err, deferIdIndex);
if ( logForReplication && ok ) {
if ( options.getField( "create" ).eoo() ) {
BSONObjBuilder b;
b << "create" << coll;
b.appendElements( options );
options = b.obj();
}
string logNs = nsToDatabase(ns) + ".$cmd";
logOp("c", logNs.c_str(), options);
}
return ok;
}
/*---------------------------------------------------------------------*/
int MongoDataFile::maxSize() {
if ( sizeof( int* ) == 4 ) {
return 512 * 1024 * 1024;
}
else if ( cmdLine.smallfiles ) {
return 0x7ff00000 >> 2;
}
else {
return 0x7ff00000;
}
}
NOINLINE_DECL void MongoDataFile::badOfs2(int ofs) const {
stringstream ss;
ss << "bad offset:" << ofs << " accessing file: " << mmf.filename() << " - consider repairing database";
uasserted(13441, ss.str());
}
NOINLINE_DECL void MongoDataFile::badOfs(int ofs) const {
stringstream ss;
ss << "bad offset:" << ofs << " accessing file: " << mmf.filename() << " - consider repairing database";
uasserted(13440, ss.str());
}
int MongoDataFile::defaultSize( const char *filename ) const {
int size;
if ( fileNo <= 4 )
size = (64*1024*1024) << fileNo;
else
size = 0x7ff00000;
if ( cmdLine.smallfiles ) {
size = size >> 2;
}
return size;
}
static void check(void *_mb) {
if( sizeof(char *) == 4 )
uassert( 10084 , "can't map file memory - mongo requires 64 bit build for larger datasets", _mb != 0);
else
uassert( 10085 , "can't map file memory", _mb != 0);
}
/** @return true if found and opened. if uninitialized (prealloc only) does not open. */
bool MongoDataFile::openExisting( const char *filename ) {
verify( _mb == 0 );
if( !boost::filesystem::exists(filename) )
return false;
if( !mmf.open(filename,false) ) {
dlog(2) << "info couldn't open " << filename << " probably end of datafile list" << endl;
return false;
}
_mb = mmf.getView(); verify(_mb);
unsigned long long sz = mmf.length();
verify( sz <= 0x7fffffff );
verify( sz % 4096 == 0 );
if( sz < 64*1024*1024 && !cmdLine.smallfiles ) {
if( sz >= 16*1024*1024 && sz % (1024*1024) == 0 ) {
log() << "info openExisting file size " << sz << " but cmdLine.smallfiles=false" << endl;
}
else {
log() << "openExisting size " << sz << " less then minimum file size expectation " << filename << endl;
verify(false);
}
}
check(_mb);
if( header()->uninitialized() )
return false;
return true;
}
void MongoDataFile::open( const char *filename, int minSize, bool preallocateOnly ) {
long size = defaultSize( filename );
while ( size < minSize ) {
if ( size < maxSize() / 2 )
size *= 2;
else {
size = maxSize();
break;
}
}
if ( size > maxSize() )
size = maxSize();
verify( size >= 64*1024*1024 || cmdLine.smallfiles );
verify( size % 4096 == 0 );
if ( preallocateOnly ) {
if ( cmdLine.prealloc ) {
FileAllocator::get()->requestAllocation( filename, size );
}
return;
}
{
verify( _mb == 0 );
unsigned long long sz = size;
if( mmf.create(filename, sz, false) )
_mb = mmf.getView();
verify( sz <= 0x7fffffff );
size = (int) sz;
}
check(_mb);
header()->init(fileNo, size, filename);
}
void MongoDataFile::flush( bool sync ) {
mmf.flush( sync );
}
void addNewExtentToNamespace(const char *ns, Extent *e, DiskLoc eloc, DiskLoc emptyLoc, bool capped) {
NamespaceIndex *ni = nsindex(ns);
NamespaceDetails *details = ni->details(ns);
if ( details ) {
verify( !details->lastExtent.isNull() );
verify( !details->firstExtent.isNull() );
getDur().writingDiskLoc(e->xprev) = details->lastExtent;
getDur().writingDiskLoc(details->lastExtent.ext()->xnext) = eloc;
verify( !eloc.isNull() );
getDur().writingDiskLoc(details->lastExtent) = eloc;
}
else {
ni->add_ns(ns, eloc, capped);
details = ni->details(ns);
}
{
NamespaceDetails *dw = details->writingWithoutExtra();
dw->lastExtentSize = e->length;
}
details->addDeletedRec(emptyLoc.drec(), emptyLoc);
}
Extent* MongoDataFile::createExtent(const char *ns, int approxSize, bool newCapped, int loops) {
verify( approxSize <= Extent::maxSize() );
{
// make sizes align with VM page size
int newSize = (approxSize + 0xfff) & 0xfffff000;
verify( newSize >= 0 );
if( newSize < Extent::maxSize() )
approxSize = newSize;
}
massert( 10357 , "shutdown in progress", ! inShutdown() );
massert( 10358 , "bad new extent size", approxSize >= Extent::minSize() && approxSize <= Extent::maxSize() );
massert( 10359 , "header==0 on new extent: 32 bit mmap space exceeded?", header() ); // null if file open failed
int ExtentSize = min(header()->unusedLength, approxSize);
DiskLoc loc;
if ( ExtentSize < Extent::minSize() ) {
/* note there could be a lot of looping here is db just started and
no files are open yet. we might want to do something about that. */
if ( loops > 8 ) {
verify( loops < 10000 );
out() << "warning: loops=" << loops << " fileno:" << fileNo << ' ' << ns << '\n';
}
log() << "newExtent: " << ns << " file " << fileNo << " full, adding a new file" << endl;
return cc().database()->addAFile( 0, true )->createExtent(ns, approxSize, newCapped, loops+1);
}
int offset = header()->unused.getOfs();
DataFileHeader *h = header();
h->unused.writing().set( fileNo, offset + ExtentSize );
getDur().writingInt(h->unusedLength) = h->unusedLength - ExtentSize;
loc.set(fileNo, offset);
Extent *e = _getExtent(loc);
DiskLoc emptyLoc = getDur().writing(e)->init(ns, ExtentSize, fileNo, offset, newCapped);
addNewExtentToNamespace(ns, e, loc, emptyLoc, newCapped);
DEV tlog(1) << "new extent " << ns << " size: 0x" << hex << ExtentSize << " loc: 0x" << hex << offset
<< " emptyLoc:" << hex << emptyLoc.getOfs() << dec << endl;
return e;
}
Extent* DataFileMgr::allocFromFreeList(const char *ns, int approxSize, bool capped) {
string s = cc().database()->name + FREELIST_NS;
NamespaceDetails *f = nsdetails(s.c_str());
if( f ) {
int low, high;
if( capped ) {
// be strict about the size
low = approxSize;
if( low > 2048 ) low -= 256;
high = (int) (approxSize * 1.05) + 256;
}
else {
low = (int) (approxSize * 0.8);
high = (int) (approxSize * 1.4);
}
if( high <= 0 ) {
// overflowed
high = max(approxSize, Extent::maxSize());
}
if ( high <= Extent::minSize() ) {
// the minimum extent size is 4097
high = Extent::minSize() + 1;
}
int n = 0;
Extent *best = 0;
int bestDiff = 0x7fffffff;
{
Timer t;
DiskLoc L = f->firstExtent;
while( !L.isNull() ) {
Extent * e = L.ext();
if( e->length >= low && e->length <= high ) {
int diff = abs(e->length - approxSize);
if( diff < bestDiff ) {
bestDiff = diff;
best = e;
if( ((double) diff) / approxSize < 0.1 ) {
// close enough
break;
}
if( t.seconds() >= 2 ) {
// have spent lots of time in write lock, and we are in [low,high], so close enough
// could come into play if extent freelist is very long
break;
}
}
else {
OCCASIONALLY {
if( high < 64 * 1024 && t.seconds() >= 2 ) {
// be less picky if it is taking a long time
high = 64 * 1024;
}
}
}
}
L = e->xnext;
++n;
}
if( t.seconds() >= 10 ) {
log() << "warning: slow scan in allocFromFreeList (in write lock)" << endl;
}
}
if( n > 128 ) LOG( n < 512 ? 1 : 0 ) << "warning: newExtent " << n << " scanned\n";
if( best ) {
Extent *e = best;
// remove from the free list
if( !e->xprev.isNull() )
e->xprev.ext()->xnext.writing() = e->xnext;
if( !e->xnext.isNull() )
e->xnext.ext()->xprev.writing() = e->xprev;
if( f->firstExtent == e->myLoc )
f->firstExtent.writing() = e->xnext;
if( f->lastExtent == e->myLoc )
f->lastExtent.writing() = e->xprev;
// use it
OCCASIONALLY if( n > 512 ) log() << "warning: newExtent " << n << " scanned" << endl;
DiskLoc emptyLoc = e->reuse(ns, capped);
addNewExtentToNamespace(ns, e, e->myLoc, emptyLoc, capped);
return e;
}
}
return 0;
// return createExtent(ns, approxSize, capped);
}
/*---------------------------------------------------------------------*/
void Extent::markEmpty() {
xnext.Null();
xprev.Null();
firstRecord.Null();
lastRecord.Null();
}
DiskLoc Extent::reuse(const char *nsname, bool capped) {
return getDur().writing(this)->_reuse(nsname, capped);
}
void getEmptyLoc(const char *ns, const DiskLoc extentLoc, int extentLength, bool capped, /*out*/DiskLoc& emptyLoc, /*out*/int& delRecLength) {
emptyLoc = extentLoc;
emptyLoc.inc( Extent::HeaderSize() );
delRecLength = extentLength - Extent::HeaderSize();
if( delRecLength >= 32*1024 && str::contains(ns, '$') && !capped ) {
// probably an index. so skip forward to keep its records page aligned
int& ofs = emptyLoc.GETOFS();
int newOfs = (ofs + 0xfff) & ~0xfff;
delRecLength -= (newOfs-ofs);
dassert( delRecLength > 0 );
ofs = newOfs;
}
}
DiskLoc Extent::_reuse(const char *nsname, bool capped) {
LOG(3) << "_reuse extent was:" << nsDiagnostic.toString() << " now:" << nsname << endl;
if (magic != extentSignature) {
StringBuilder sb;
sb << "bad extent signature " << toHex(&magic, 4)
<< " for namespace '" << nsDiagnostic.toString()
<< "' found in Extent::_reuse";
msgasserted(10360, sb.str());
}
nsDiagnostic = nsname;
markEmpty();
DiskLoc emptyLoc;
int delRecLength;
getEmptyLoc(nsname, myLoc, length, capped, emptyLoc, delRecLength);
// todo: some dup code here and below in Extent::init
DeletedRecord* empty = getDur().writing(DataFileMgr::getDeletedRecord(emptyLoc));
empty->lengthWithHeaders() = delRecLength;
empty->extentOfs() = myLoc.getOfs();
empty->nextDeleted().Null();
return emptyLoc;
}
/* assumes already zeroed -- insufficient for block 'reuse' perhaps */
DiskLoc Extent::init(const char *nsname, int _length, int _fileNo, int _offset, bool capped) {
magic = extentSignature;
myLoc.set(_fileNo, _offset);
xnext.Null();
xprev.Null();
nsDiagnostic = nsname;
length = _length;
firstRecord.Null();
lastRecord.Null();
DiskLoc emptyLoc;
int delRecLength;
getEmptyLoc(nsname, myLoc, _length, capped, emptyLoc, delRecLength);
DeletedRecord* empty = getDur().writing(DataFileMgr::getDeletedRecord(emptyLoc));
empty->lengthWithHeaders() = delRecLength;
empty->extentOfs() = myLoc.getOfs();
empty->nextDeleted().Null();
return emptyLoc;
}
bool Extent::validates(const DiskLoc diskLoc, BSONArrayBuilder* errors) {
bool extentOk = true;
if (magic != extentSignature) {
if (errors) {
StringBuilder sb;
sb << "bad extent signature " << toHex(&magic, 4)
<< " in extent " << diskLoc.toString();
*errors << sb.str();
}
extentOk = false;
}
if (myLoc != diskLoc) {
if (errors) {
StringBuilder sb;
sb << "extent " << diskLoc.toString()
<< " self-pointer is " << myLoc.toString();
*errors << sb.str();
}
extentOk = false;
}
if (firstRecord.isNull() != lastRecord.isNull()) {
if (errors) {
StringBuilder sb;
if (firstRecord.isNull()) {
sb << "in extent " << diskLoc.toString()
<< ", firstRecord is null but lastRecord is "
<< lastRecord.toString();
}
else {
sb << "in extent " << diskLoc.toString()
<< ", firstRecord is " << firstRecord.toString()
<< " but lastRecord is null";
}
*errors << sb.str();
}
extentOk = false;
}
if (length < minSize()) {
if (errors) {
StringBuilder sb;
sb << "length of extent " << diskLoc.toString()
<< " is " << length
<< ", which is less than minimum length of " << minSize();
*errors << sb.str();
}
extentOk = false;
}
return extentOk;
}
/*
Record* Extent::newRecord(int len) {
if( firstEmptyRegion.isNull() )8
return 0;
verify(len > 0);
int newRecSize = len + Record::HeaderSize;
DiskLoc newRecordLoc = firstEmptyRegion;
Record *r = getRecord(newRecordLoc);
int left = r->netLength() - len;
if( left < 0 ) {
//
firstEmptyRegion.Null();
return 0;
}
DiskLoc nextEmpty = r->next.getNextEmpty(firstEmptyRegion);
r->lengthWithHeaders = newRecSize;
r->next.markAsFirstOrLastInExtent(this); // we're now last in the extent
if( !lastRecord.isNull() ) {
verify(getRecord(lastRecord)->next.lastInExtent()); // it was the last one
getRecord(lastRecord)->next.set(newRecordLoc); // until now
r->prev.set(lastRecord);
}
else {
r->prev.markAsFirstOrLastInExtent(this); // we are the first in the extent
verify( firstRecord.isNull() );
firstRecord = newRecordLoc;
}
lastRecord = newRecordLoc;
if( left < Record::HeaderSize + 32 ) {
firstEmptyRegion.Null();
}
else {
firstEmptyRegion.inc(newRecSize);
Record *empty = getRecord(firstEmptyRegion);
empty->next.set(nextEmpty); // not for empty records, unless in-use records, next and prev can be null.
empty->prev.Null();
empty->lengthWithHeaders = left;
}
return r;
}
*/
int Extent::maxSize() {
int maxExtentSize = 0x7ff00000;
if ( cmdLine.smallfiles ) {
maxExtentSize >>= 2;
}
return maxExtentSize;
}
/*---------------------------------------------------------------------*/
DataFileMgr::DataFileMgr() : _precalcedMutex("PrecalcedMutex"), _precalced(NULL) {
}
SortPhaseOne* DataFileMgr::getPrecalced() const {
return _precalced;
}
void DataFileMgr::setPrecalced(SortPhaseOne* precalced) {
_precalced = precalced;
}
shared_ptr<Cursor> DataFileMgr::findAll(const StringData& ns, const DiskLoc &startLoc) {
NamespaceDetails * d = nsdetails( ns );
if ( ! d )
return shared_ptr<Cursor>(new BasicCursor(DiskLoc()));
DiskLoc loc = d->firstExtent;
Extent *e = getExtent(loc);
DEBUGGING {
out() << "listing extents for " << ns << endl;
DiskLoc tmp = loc;
set<DiskLoc> extents;
while ( 1 ) {
Extent *f = getExtent(tmp);
out() << "extent: " << tmp.toString() << endl;
extents.insert(tmp);
tmp = f->xnext;
if ( tmp.isNull() )
break;
f = f->getNextExtent();
}
out() << endl;
d->dumpDeleted(&extents);
}
if ( d->isCapped() )
return shared_ptr<Cursor>( ForwardCappedCursor::make( d , startLoc ) );
if ( !startLoc.isNull() )
return shared_ptr<Cursor>(new BasicCursor( startLoc ));
while ( e->firstRecord.isNull() && !e->xnext.isNull() ) {
/* todo: if extent is empty, free it for reuse elsewhere.
that is a bit complicated have to clean up the freelists.
*/
RARELY out() << "info DFM::findAll(): extent " << loc.toString() << " was empty, skipping ahead. ns:" << ns << endl;
// find a nonempty extent
// it might be nice to free the whole extent here! but have to clean up free recs then.
e = e->getNextExtent();
}
return shared_ptr<Cursor>(new BasicCursor( e->firstRecord ));
}
/* get a table scan cursor, but can be forward or reverse direction.
order.$natural - if set, > 0 means forward (asc), < 0 backward (desc).
*/
shared_ptr<Cursor> findTableScan(const char *ns, const BSONObj& order, const DiskLoc &startLoc) {
BSONElement el = order.getField("$natural"); // e.g., { $natural : -1 }
if ( el.number() >= 0 )
return DataFileMgr::findAll(ns, startLoc);
// "reverse natural order"
NamespaceDetails *d = nsdetails(ns);
if ( !d )
return shared_ptr<Cursor>(new BasicCursor(DiskLoc()));
if ( !d->isCapped() ) {
if ( !startLoc.isNull() )
return shared_ptr<Cursor>(new ReverseCursor( startLoc ));
Extent *e = d->lastExtent.ext();
while ( e->lastRecord.isNull() && !e->xprev.isNull() ) {
OCCASIONALLY out() << " findTableScan: extent empty, skipping ahead" << endl;
e = e->getPrevExtent();
}
return shared_ptr<Cursor>(new ReverseCursor( e->lastRecord ));
}
else {
return shared_ptr<Cursor>( new ReverseCappedCursor( d, startLoc ) );
}
}
void printFreeList() {
string s = cc().database()->name + FREELIST_NS;
log() << "dump freelist " << s << endl;
NamespaceDetails *freeExtents = nsdetails(s.c_str());
if( freeExtents == 0 ) {
log() << " freeExtents==0" << endl;
return;
}
DiskLoc a = freeExtents->firstExtent;
while( !a.isNull() ) {
Extent *e = a.ext();
log() << " extent " << a.toString() << " len:" << e->length << " prev:" << e->xprev.toString() << endl;
a = e->xnext;
}
log() << "end freelist" << endl;
}
/** free a list of extents that are no longer in use. this is a double linked list of extents
(could be just one in the list)
*/
void freeExtents(DiskLoc firstExt, DiskLoc lastExt) {
{
verify( !firstExt.isNull() && !lastExt.isNull() );
Extent *f = firstExt.ext();
Extent *l = lastExt.ext();
verify( f->xprev.isNull() );
verify( l->xnext.isNull() );
verify( f==l || !f->xnext.isNull() );
verify( f==l || !l->xprev.isNull() );
}
string s = cc().database()->name + FREELIST_NS;
NamespaceDetails *freeExtents = nsdetails(s.c_str());
if( freeExtents == 0 ) {
string err;
_userCreateNS(s.c_str(), BSONObj(), err, 0); // todo: this actually allocates an extent, which is bad!
freeExtents = nsdetails(s.c_str());
massert( 10361 , "can't create .$freelist", freeExtents);
}
if( freeExtents->firstExtent.isNull() ) {
freeExtents->firstExtent.writing() = firstExt;
freeExtents->lastExtent.writing() = lastExt;
}
else {
DiskLoc a = freeExtents->firstExtent;
verify( a.ext()->xprev.isNull() );
getDur().writingDiskLoc( a.ext()->xprev ) = lastExt;
getDur().writingDiskLoc( lastExt.ext()->xnext ) = a;
getDur().writingDiskLoc( freeExtents->firstExtent ) = firstExt;
}
//printFreeList();
}
/* drop a collection/namespace */
void dropNS(const string& nsToDrop) {
NamespaceDetails* d = nsdetails(nsToDrop.c_str());
uassert( 10086 , (string)"ns not found: " + nsToDrop , d );
BackgroundOperation::assertNoBgOpInProgForNs(nsToDrop.c_str());
NamespaceString s(nsToDrop);
verify( s.db == cc().database()->name );
if( s.isSystem() ) {
if( s.coll == "system.profile" )
uassert( 10087 , "turn off profiling before dropping system.profile collection", cc().database()->profile == 0 );
else
uasserted( 12502, "can't drop system ns" );
}
{
// remove from the system catalog
BSONObj cond = BSON( "name" << nsToDrop ); // { name: "colltodropname" }
string system_namespaces = cc().database()->name + ".system.namespaces";
/*int n = */ deleteObjects(system_namespaces.c_str(), cond, false, false, true);
// no check of return code as this ns won't exist for some of the new storage engines
}
// free extents
if( !d->firstExtent.isNull() ) {
freeExtents(d->firstExtent, d->lastExtent);
getDur().writingDiskLoc( d->firstExtent ).setInvalid();
getDur().writingDiskLoc( d->lastExtent ).setInvalid();
}
// remove from the catalog hashtable
cc().database()->namespaceIndex.kill_ns(nsToDrop.c_str());
}
void dropCollection( const string &name, string &errmsg, BSONObjBuilder &result ) {
LOG(1) << "dropCollection: " << name << endl;
NamespaceDetails *d = nsdetails(name.c_str());
if( d == 0 )
return;
BackgroundOperation::assertNoBgOpInProgForNs(name.c_str());
if ( d->nIndexes != 0 ) {
try {
verify( dropIndexes(d, name.c_str(), "*", errmsg, result, true) );
}
catch( DBException& e ) {
stringstream ss;
ss << "drop: dropIndexes for collection failed - consider trying repair ";
ss << " cause: " << e.what();