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/**
* Copyright (C) 2009 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/>.
*/
#include "../stdafx.h"
#include <fcntl.h>
#include <errno.h>
#if defined(__freebsd__)
#include <sys/stat.h>
#endif
#ifndef O_NOATIME
#define O_NOATIME 0
#endif
namespace mongo {
// Handles allocation of contiguous files on disk. Allocation may be
// requested asynchronously or synchronously.
class FileAllocator {
// The public functions may not be called concurrently. The allocation
// functions may be called multiple times per file, but only the first
// size specified per file will be used.
public:
#if !defined(_WIN32)
FileAllocator() : failed_() {}
#endif
void start() {
#if !defined(_WIN32)
Runner r( *this );
boost::thread t( r );
#endif
}
// May be called if file exists. If file exists, or its allocation has
// been requested, size is updated to match existing file size.
void requestAllocation( const string &name, int &size ) {
#if !defined(_WIN32)
boostlock lk( pendingMutex_ );
int oldSize = prevSize( name );
if ( oldSize != -1 ) {
size = oldSize;
return;
}
pending_.push_back( name );
pendingSize_[ name ] = size;
pendingUpdated_.notify_all();
#endif
}
// Returns when file has been allocated. If file exists, size is
// updated to match existing file size.
void allocateAsap( const string &name, int &size ) {
#if !defined(_WIN32)
boostlock lk( pendingMutex_ );
int oldSize = prevSize( name );
if ( oldSize != -1 ) {
size = oldSize;
if ( !inProgress( name ) )
return;
}
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 ) )
pendingUpdated_.wait( lk );
#endif
}
void waitUntilFinished() const {
#if !defined(_WIN32)
if ( failed_ )
return;
boostlock lk( pendingMutex_ );
while( pending_.size() != 0 )
pendingUpdated_.wait( lk );
#endif
}
private:
#if !defined(_WIN32)
// caller must hold pendingMutex_ lock. Returns size if allocated or
// allocation requested, -1 otherwise.
int 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 inProgress( const string &name ) const {
for( list< string >::const_iterator i = pending_.begin(); i != pending_.end(); ++i )
if ( *i == name )
return true;
return false;
}
mutable boost::mutex pendingMutex_;
mutable boost::condition pendingUpdated_;
list< string > pending_;
mutable map< string, int > pendingSize_;
bool failed_;
struct Runner {
Runner( FileAllocator &allocator ) : a_( allocator ) {}
FileAllocator &a_;
void operator()() {
while( 1 ) {
{
boostlock lk( a_.pendingMutex_ );
if ( a_.pending_.size() == 0 )
a_.pendingUpdated_.wait( lk );
}
while( 1 ) {
string name;
int size;
{
boostlock lk( a_.pendingMutex_ );
if ( a_.pending_.size() == 0 )
break;
name = a_.pending_.front();
size = a_.pendingSize_[ name ];
}
try {
int fd = open(name.c_str(), O_CREAT | O_RDWR | O_NOATIME, S_IRUSR | S_IWUSR);
if ( fd <= 0 ) {
stringstream ss;
ss << "couldn't open " << name << ' ' << errno;
massert( ss.str(), fd <= 0 );
}
/* make sure the file is the full desired length */
off_t filelen = lseek(fd, 0, SEEK_END);
if ( filelen < size ) {
massert( "failure mapping new file", filelen == 0 );
// Check for end of disk.
massert( "Unable to allocate file of desired size",
size - 1 == lseek(fd, size - 1, SEEK_SET) );
massert( "Unable to allocate file of desired size",
1 == write(fd, "", 1) );
lseek(fd, 0, SEEK_SET);
log() << "allocating new datafile " << name << ", filling with zeroes..." << endl;
Timer t;
int z = 8192;
char buf[z];
memset(buf, 0, z);
int left = size;
while ( 1 ) {
if ( left <= z ) {
massert( "write failed", left == write(fd, buf, left) );
break;
}
massert( "write failed", z == write(fd, buf, z) );
left -= z;
}
log() << "done allocating datafile " << name << ", size: " << size << ", took " << ((double)t.millis())/1000.0 << " secs" << endl;
}
close( fd );
} catch ( ... ) {
problem() << "Failed to allocate new file: " << name
<< ", size: " << size << ", aborting." << endl;
try {
BOOST_CHECK_EXCEPTION( boost::filesystem::remove( name ) );
} catch ( ... ) {
}
a_.failed_ = true;
dbexit( 45 );
}
{
boostlock lk( a_.pendingMutex_ );
a_.pendingSize_.erase( name );
a_.pending_.pop_front();
a_.pendingUpdated_.notify_all();
}
}
}
}
};
#endif
};
FileAllocator &theFileAllocator();
} // namespace mongo
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