/* returns an fd on success, or a -1 on failure and sets errno */
int
tr_fdFileCheckout( const char * folder,
const char * torrentFile,
int doWrite,
int doPreallocate,
uint64_t desiredFileSize )
{
int i, winner = -1;
struct tr_openfile * o;
char * filename;
assert( folder && *folder );
assert( torrentFile && *torrentFile );
assert( doWrite == 0 || doWrite == 1 );
filename = tr_buildPath( folder, torrentFile, NULL );
dbgmsg( "looking for file '%s', writable %c", filename,
doWrite ? 'y' : 'n' );
tr_lockLock( gFd->lock );
/* Is it already open? */
for( i = 0; i < TR_MAX_OPEN_FILES; ++i )
{
o = &gFd->open[i];
if( !fileIsOpen( o ) )
continue;
if( strcmp( filename, o->filename ) )
continue;
if( fileIsCheckedOut( o ) )
{
dbgmsg( "found it! it's open, but checked out. waiting..." );
tr_lockUnlock( gFd->lock );
tr_wait( 200 );
tr_lockLock( gFd->lock );
i = -1; /* reloop */
continue;
}
if( doWrite && !o->isWritable )
{
dbgmsg(
"found it! it's open and available, but isn't writable. closing..." );
TrCloseFile( i );
break;
}
dbgmsg( "found it! it's ready for use!" );
winner = i;
break;
}
dbgmsg(
"it's not already open. looking for an open slot or an old file." );
while( winner < 0 )
{
uint64_t date = tr_date( ) + 1;
/* look for the file that's been open longest */
for( i = 0; i < TR_MAX_OPEN_FILES; ++i )
{
o = &gFd->open[i];
if( !fileIsOpen( o ) )
{
winner = i;
dbgmsg( "found an empty slot in %d", winner );
break;
}
if( date > o->date )
{
date = o->date;
winner = i;
}
}
if( winner >= 0 )
{
if( fileIsOpen( &gFd->open[winner] ) )
{
dbgmsg( "closing file '%s', slot #%d",
gFd->open[winner].filename,
winner );
TrCloseFile( winner );
}
}
else
{
dbgmsg(
"everything's full! waiting for someone else to finish something" );
tr_lockUnlock( gFd->lock );
tr_wait( 200 );
tr_lockLock( gFd->lock );
}
}
assert( winner >= 0 );
o = &gFd->open[winner];
if( !fileIsOpen( o ) )
{
const int err = TrOpenFile( winner, folder, torrentFile, doWrite, doPreallocate, desiredFileSize );
if( err ) {
tr_lockUnlock( gFd->lock );
tr_free( filename );
errno = err;
return -1;
}
dbgmsg( "opened '%s' in slot %d, doWrite %c", filename, winner,
doWrite ? 'y' : 'n' );
tr_strlcpy( o->filename, filename, sizeof( o->filename ) );
o->isWritable = doWrite;
}
dbgmsg( "checking out '%s' in slot %d", filename, winner );
o->isCheckedOut = 1;
o->closeWhenDone = 0;
o->date = tr_date( );
tr_free( filename );
tr_lockUnlock( gFd->lock );
return o->fd;
}
/* returns an fd on success, or a -1 on failure and sets errno */
int
tr_fdFileCheckout( tr_session * session,
int torrentId,
tr_file_index_t fileNum,
const char * filename,
tr_bool doWrite,
tr_preallocation_mode preallocationMode,
uint64_t desiredFileSize )
{
int i, winner = -1;
struct tr_fdInfo * gFd;
struct tr_openfile * o;
assert( tr_isSession( session ) );
assert( session->fdInfo != NULL );
assert( torrentId > 0 );
assert( filename && *filename );
assert( tr_isBool( doWrite ) );
gFd = session->fdInfo;
dbgmsg( "looking for file '%s', writable %c", filename, doWrite ? 'y' : 'n' );
/* is it already open? */
for( i=0; i<gFd->openFileLimit; ++i )
{
o = &gFd->openFiles[i];
if( torrentId != o->torrentId )
continue;
if( fileNum != o->fileNum )
continue;
if( !fileIsOpen( o ) )
continue;
if( doWrite && !o->isWritable )
{
dbgmsg( "found it! it's open and available, but isn't writable. closing..." );
TrCloseFile( o );
break;
}
dbgmsg( "found it! it's ready for use!" );
winner = i;
break;
}
dbgmsg( "it's not already open. looking for an open slot or an old file." );
while( winner < 0 )
{
time_t date = tr_time( ) + 1;
/* look for the file that's been open longest */
for( i=0; i<gFd->openFileLimit; ++i )
{
o = &gFd->openFiles[i];
if( !fileIsOpen( o ) )
{
winner = i;
dbgmsg( "found an empty slot in %d", winner );
break;
}
if( date > o->date )
{
date = o->date;
winner = i;
}
}
assert( winner >= 0 );
if( fileIsOpen( &gFd->openFiles[winner] ) )
{
dbgmsg( "closing file \"%s\"", gFd->openFiles[winner].filename );
TrCloseFile( &gFd->openFiles[winner] );
}
}
assert( winner >= 0 );
o = &gFd->openFiles[winner];
if( !fileIsOpen( o ) )
{
const int err = TrOpenFile( session, winner, filename, doWrite,
preallocationMode, desiredFileSize );
if( err ) {
errno = err;
return -1;
}
dbgmsg( "opened '%s' in slot %d, doWrite %c", filename, winner,
doWrite ? 'y' : 'n' );
tr_strlcpy( o->filename, filename, sizeof( o->filename ) );
o->isWritable = doWrite;
}
dbgmsg( "checking out '%s' in slot %d", filename, winner );
o->torrentId = torrentId;
o->fileNum = fileNum;
o->date = tr_time( );
return o->fd;
}
