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// @file file_allocator.cpp
/* Copyright 2009 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "pch.h"
#include <fcntl.h>
#include <errno.h>
#if defined(__freebsd__) || defined(__openbsd__)
#include <sys/stat.h>
#endif
#include "timer.h"
#include "mongoutils/str.h"
using namespace mongoutils;
#ifndef O_NOATIME
#define O_NOATIME (0)
#endif
#include "file_allocator.h"
namespace mongo {
#if defined(_WIN32)
FileAllocator::FileAllocator(){
}
void FileAllocator::start(){
}
void FileAllocator::requestAllocation( const string &name, long &size ) {
/* Some of the system calls in the file allocator don't work in win,
so no win support - 32 or 64 bit. Plus we don't seem to need preallocation
on windows anyway as we don't have to pre-zero the file there.
*/
}
void FileAllocator::allocateAsap( const string &name, unsigned long long &size ){
// no-op
}
void FileAllocator::waitUntilFinished() const {
// no-op
}
void FileAllocator::ensureLength(int fd , long size) {
// we don't zero on windows
// TODO : we should to avoid fragmentation
}
#else
FileAllocator::FileAllocator()
: _pendingMutex("FileAllocator"), _failed() {
}
void FileAllocator::start() {
boost::thread t( boost::bind( &FileAllocator::run , this ) );
}
void FileAllocator::requestAllocation( const string &name, long &size ) {
scoped_lock lk( _pendingMutex );
if ( _failed )
return;
long oldSize = prevSize( name );
if ( oldSize != -1 ) {
size = oldSize;
return;
}
_pending.push_back( name );
_pendingSize[ name ] = size;
_pendingUpdated.notify_all();
}
void FileAllocator::allocateAsap( const string &name, unsigned long long &size ) {
scoped_lock lk( _pendingMutex );
long oldSize = prevSize( name );
if ( oldSize != -1 ) {
size = oldSize;
if ( !inProgress( name ) )
return;
}
checkFailure();
_pendingSize[ name ] = size;
if ( _pending.size() == 0 )
_pending.push_back( name );
else if ( _pending.front() != name ) {
_pending.remove( name );
list< string >::iterator i = _pending.begin();
++i;
_pending.insert( i, name );
}
_pendingUpdated.notify_all();
while( inProgress( name ) ) {
checkFailure();
_pendingUpdated.wait( lk.boost() );
}
}
void FileAllocator::waitUntilFinished() const {
if ( _failed )
return;
scoped_lock lk( _pendingMutex );
while( _pending.size() != 0 )
_pendingUpdated.wait( lk.boost() );
}
void FileAllocator::ensureLength(int fd , long size) {
#if defined(__linux__)
int ret = posix_fallocate(fd,0,size);
if ( ret == 0 )
return;
log() << "FileAllocator: posix_fallocate failed: " << errnoWithDescription( ret ) << " falling back" << endl;
#endif
off_t filelen = lseek(fd, 0, SEEK_END);
if ( filelen < size ) {
if (filelen != 0) {
stringstream ss;
ss << "failure creating new datafile; lseek failed for fd " << fd << " with errno: " << errnoWithDescription();
uassert( 10440 , ss.str(), filelen == 0 );
}
// Check for end of disk.
uassert( 10441 , str::stream() << "Unable to allocate new file of size " << size << ' ' << errnoWithDescription(),
size - 1 == lseek(fd, size - 1, SEEK_SET) );
uassert( 10442 , str::stream() << "Unable to allocate new file of size " << size << ' ' << errnoWithDescription(),
1 == write(fd, "", 1) );
lseek(fd, 0, SEEK_SET);
const long z = 256 * 1024;
const boost::scoped_array<char> buf_holder (new char[z]);
char* buf = buf_holder.get();
memset(buf, 0, z);
long left = size;
while ( left > 0 ) {
long towrite = left;
if ( towrite > z )
towrite = z;
int written = write( fd , buf , towrite );
uassert( 10443 , errnoWithPrefix("FileAllocator: file write failed" ), written > 0 );
left -= written;
}
}
}
void FileAllocator::checkFailure() {
if (_failed) {
// we want to log the problem (diskfull.js expects it) but we do not want to dump a stack tracke
msgassertedNoTrace( 12520, "new file allocation failure" );
}
}
long FileAllocator::prevSize( const string &name ) const {
if ( _pendingSize.count( name ) > 0 )
return _pendingSize[ name ];
if ( boost::filesystem::exists( name ) )
return boost::filesystem::file_size( name );
return -1;
}
// caller must hold _pendingMutex lock.
bool FileAllocator::inProgress( const string &name ) const {
for( list< string >::const_iterator i = _pending.begin(); i != _pending.end(); ++i )
if ( *i == name )
return true;
return false;
}
void FileAllocator::run( FileAllocator * fa ){
setThreadName( "FileAllocator" );
while( 1 ) {
{
scoped_lock lk( fa->_pendingMutex );
if ( fa->_pending.size() == 0 )
fa->_pendingUpdated.wait( lk.boost() );
}
while( 1 ) {
string name;
long size;
{
scoped_lock lk( fa->_pendingMutex );
if ( fa->_pending.size() == 0 )
break;
name = fa->_pending.front();
size = fa->_pendingSize[ name ];
}
try {
log() << "allocating new datafile " << name << ", filling with zeroes..." << endl;
long fd = open(name.c_str(), O_CREAT | O_RDWR | O_NOATIME, S_IRUSR | S_IWUSR);
if ( fd <= 0 ) {
stringstream ss;
ss << "FileAllocator: couldn't open " << name << ' ' << errnoWithDescription();
uassert( 10439 , ss.str(), fd <= 0 );
}
#if defined(POSIX_FADV_DONTNEED)
if( posix_fadvise(fd, 0, size, POSIX_FADV_DONTNEED) ) {
log() << "warning: posix_fadvise fails " << name << ' ' << errnoWithDescription() << endl;
}
#endif
Timer t;
/* make sure the file is the full desired length */
ensureLength( fd , size );
log() << "done allocating datafile " << name << ", "
<< "size: " << size/1024/1024 << "MB, "
<< " took " << ((double)t.millis())/1000.0 << " secs"
<< endl;
close( fd );
} catch ( ... ) {
log() << "error failed to allocate new file: " << name
<< " size: " << size << ' ' << errnoWithDescription() << endl;
try {
BOOST_CHECK_EXCEPTION( boost::filesystem::remove( name ) );
} catch ( ... ) {
}
scoped_lock lk( fa->_pendingMutex );
fa->_failed = true;
// not erasing from pending
fa->_pendingUpdated.notify_all();
return; // no more allocation
}
{
scoped_lock lk( fa->_pendingMutex );
fa->_pendingSize.erase( name );
fa->_pending.pop_front();
fa->_pendingUpdated.notify_all();
}
}
}
}
#endif
// The mutex contained in this object may be held on shutdown.
FileAllocator &theFileAllocator_ = *(new FileAllocator());
FileAllocator &theFileAllocator() { return theFileAllocator_; }
} // namespace mongo
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