transmission/libtransmission/verify.c

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/*
* This file Copyright (C) 2007-2008 Charles Kerr <charles@rebelbase.com>
*
* This file is licensed by the GPL version 2. Works owned by the
* Transmission project are granted a special exemption to clause 2(b)
* so that the bulk of its code can remain under the MIT license.
* This exemption does not extend to derived works not owned by
* the Transmission project.
*
* $Id$
*/
#include <sys/stat.h>
#include "transmission.h"
#include "completion.h"
#include "resume.h" /* tr_torrentSaveResume() */
#include "inout.h"
#include "list.h"
#include "platform.h"
#include "torrent.h"
#include "utils.h" /* tr_buildPath */
#include "verify.h"
/**
***
**/
struct verify_node
{
tr_torrent * torrent;
tr_verify_done_cb verify_done_cb;
};
static void
fireCheckDone( tr_torrent * torrent,
tr_verify_done_cb verify_done_cb )
{
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if( verify_done_cb )
verify_done_cb( torrent );
}
static struct verify_node currentNode;
static tr_list * verifyList = NULL;
static tr_thread * verifyThread = NULL;
static int stopCurrent = FALSE;
static tr_lock*
getVerifyLock( void )
{
static tr_lock * lock = NULL;
if( lock == NULL )
lock = tr_lockNew( );
return lock;
}
static int
checkFile( tr_torrent * tor,
tr_file_index_t fileIndex,
int * abortFlag )
{
tr_piece_index_t i;
int changed = FALSE;
int nofile;
struct stat sb;
char path[MAX_PATH_LENGTH];
const tr_file * file = &tor->info.files[fileIndex];
tr_buildPath ( path, sizeof( path ), tor->downloadDir, file->name, NULL );
nofile = stat( path, &sb ) || !S_ISREG( sb.st_mode );
for( i = file->firstPiece;
i <= file->lastPiece && i < tor->info.pieceCount && ( !*abortFlag );
++i )
{
if( nofile )
{
tr_torrentSetHasPiece( tor, i, 0 );
}
else if( !tr_torrentIsPieceChecked( tor, i ) )
{
const int wasComplete = tr_cpPieceIsComplete(
tor->completion, i );
if( tr_ioTestPiece( tor, i ) ) /* yay */
{
tr_torrentSetHasPiece( tor, i, TRUE );
if( !wasComplete )
changed = TRUE;
}
else
{
/* if we were wrong about it being complete,
* reset and start again. if we were right about
* it being incomplete, do nothing -- we don't
* want to lose blocks in those incomplete pieces */
if( wasComplete )
{
tr_torrentSetHasPiece( tor, i, FALSE );
changed = TRUE;
}
}
}
tr_torrentSetPieceChecked( tor, i, TRUE );
}
return changed;
}
static void
verifyThreadFunc( void * unused UNUSED )
{
for( ; ; )
{
int changed = 0;
tr_file_index_t i;
tr_torrent * tor;
struct verify_node * node;
tr_lockLock( getVerifyLock( ) );
stopCurrent = FALSE;
node = (struct verify_node*) verifyList ? verifyList->data : NULL;
if( node == NULL )
{
currentNode.torrent = NULL;
break;
}
currentNode = *node;
tor = currentNode.torrent;
tr_list_remove_data( &verifyList, node );
tr_free( node );
tr_lockUnlock( getVerifyLock( ) );
tor->verifyState = TR_VERIFY_NOW;
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tr_torinf( tor, _( "Verifying torrent" ) );
for( i = 0; i < tor->info.fileCount && !stopCurrent; ++i )
changed |= checkFile( tor, i, &stopCurrent );
tor->verifyState = TR_VERIFY_NONE;
if( !stopCurrent )
{
if( changed )
tr_torrentSaveResume( tor );
fireCheckDone( tor, currentNode.verify_done_cb );
}
}
verifyThread = NULL;
tr_lockUnlock( getVerifyLock( ) );
}
void
tr_verifyAdd( tr_torrent * tor,
tr_verify_done_cb verify_done_cb )
{
const int uncheckedCount = tr_torrentCountUncheckedPieces( tor );
if( !uncheckedCount )
{
/* doesn't need to be checked... */
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fireCheckDone( tor, verify_done_cb );
}
else
{
struct verify_node * node;
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tr_torinf( tor, _( "Queued for verification" ) );
node = tr_new( struct verify_node, 1 );
node->torrent = tor;
node->verify_done_cb = verify_done_cb;
tr_lockLock( getVerifyLock( ) );
tor->verifyState = verifyList ? TR_VERIFY_WAIT : TR_VERIFY_NOW;
tr_list_append( &verifyList, node );
if( verifyThread == NULL )
verifyThread = tr_threadNew( verifyThreadFunc, NULL );
tr_lockUnlock( getVerifyLock( ) );
}
}
static int
compareVerifyByTorrent( const void * va,
const void * vb )
{
const struct verify_node * a = va;
const tr_torrent * b = vb;
return a->torrent - b;
}
void
tr_verifyRemove( tr_torrent * tor )
{
tr_lock * lock = getVerifyLock( );
tr_lockLock( lock );
if( tor == currentNode.torrent )
{
stopCurrent = TRUE;
while( stopCurrent )
{
tr_lockUnlock( lock );
tr_wait( 100 );
tr_lockLock( lock );
}
}
else
{
tr_free( tr_list_remove( &verifyList, tor, compareVerifyByTorrent ) );
tor->verifyState = TR_VERIFY_NONE;
}
tr_lockUnlock( lock );
}