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transmission/libtransmission/verify.c

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/*
* This file Copyright (C) 2007-2009 Charles Kerr <charles@transmissionbt.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 <unistd.h> /* S_ISREG */
#include <sys/stat.h>
#ifdef HAVE_POSIX_FADVISE
#define _XOPEN_SOURCE 600
#include <fcntl.h> /* posix_fadvise() */
#endif
#include <openssl/sha.h>
#include "transmission.h"
#include "completion.h"
#include "fdlimit.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"
/***
****
***/
/* #define STOPWATCH */
static tr_bool
verifyTorrent( tr_torrent * tor, tr_bool * stopFlag )
{
SHA_CTX sha;
int fd = -1;
int64_t filePos = 0;
tr_bool changed = 0;
tr_bool hadPiece = 0;
uint32_t piecePos = 0;
tr_file_index_t fileIndex = 0;
tr_piece_index_t pieceIndex = 0;
const int64_t buflen = tor->info.pieceSize;
uint8_t * buffer = tr_new( uint8_t, buflen );
#ifdef STOPWATCH
time_t now = time( NULL );
#endif
SHA1_Init( &sha );
while( !*stopFlag && ( pieceIndex < tor->info.pieceCount ) )
{
int64_t leftInPiece;
int64_t leftInFile;
int64_t bytesThisPass;
const tr_file * file = &tor->info.files[fileIndex];
/* if we're starting a new piece... */
if( piecePos == 0 )
{
hadPiece = tr_cpPieceIsComplete( &tor->completion, pieceIndex );
/* fprintf( stderr, "starting piece %d of %d\n", (int)pieceIndex, (int)tor->info.pieceCount ); */
}
/* if we're starting a new file... */
if( !filePos && (fd<0) )
{
char * filename = tr_buildPath( tor->downloadDir, file->name, NULL );
fd = tr_open_file_for_scanning( filename );
/* fprintf( stderr, "opening file #%d (%s) -- %d\n", fileIndex, filename, fd ); */
tr_free( filename );
}
/* figure out how much we can read this pass */
leftInPiece = tr_torPieceCountBytes( tor, pieceIndex ) - piecePos;
leftInFile = file->length - filePos;
bytesThisPass = MIN( leftInFile, leftInPiece );
bytesThisPass = MIN( bytesThisPass, buflen );
/* fprintf( stderr, "reading this pass: %d\n", (int)bytesThisPass ); */
/* read a bit */
if( (fd>=0) && tr_lseek( fd, filePos, SEEK_SET ) != -1 ) {
const int64_t numRead = read( fd, buffer, bytesThisPass );
if( numRead == bytesThisPass )
SHA1_Update( &sha, buffer, numRead );
}
/* move our offsets */
leftInPiece -= bytesThisPass;
leftInFile -= bytesThisPass;
piecePos += bytesThisPass;
filePos += bytesThisPass;
/* if we're finishing a piece... */
if( leftInPiece == 0 )
{
tr_bool hasPiece;
uint8_t hash[SHA_DIGEST_LENGTH];
SHA1_Final( hash, &sha );
hasPiece = !memcmp( hash, tor->info.pieces[pieceIndex].hash, SHA_DIGEST_LENGTH );
/* fprintf( stderr, "do the hashes match? %s\n", (hasPiece?"yes":"no") ); */
if( hasPiece ) {
tr_torrentSetHasPiece( tor, pieceIndex, TRUE );
if( !hadPiece )
changed = TRUE;
} else if( hadPiece ) {
tr_torrentSetHasPiece( tor, pieceIndex, FALSE );
changed = TRUE;
}
tr_torrentSetPieceChecked( tor, pieceIndex, TRUE );
SHA1_Init( &sha );
++pieceIndex;
piecePos = 0;
}
/* if we're finishing a file... */
if( leftInFile == 0 )
{
/* fprintf( stderr, "closing file\n" ); */
if( fd >= 0 ) { tr_close_file( fd ); fd = -1; }
++fileIndex;
filePos = 0;
}
}
/* cleanup */
if( fd >= 0 )
tr_close_file( fd );
tr_free( buffer );
#ifdef STOPWATCH
{
time_t now2 = time( NULL );
fprintf( stderr, "it took %d seconds to verify %"PRIu64" bytes (%"PRIu64" bytes per second)\n",
(int)(now2-now), tor->info.totalSize, (uint64_t)(tor->info.totalSize/(1+(now2-now))) );
}
#endif
return changed;
}
/***
****
***/
struct verify_node
{
tr_torrent * torrent;
tr_verify_done_cb verify_done_cb;
};
static void
fireCheckDone( tr_torrent * tor, tr_verify_done_cb verify_done_cb )
{
assert( tr_isTorrent( tor ) );
if( verify_done_cb )
verify_done_cb( tor );
}
static struct verify_node currentNode;
static tr_list * verifyList = NULL;
static tr_thread * verifyThread = NULL;
static tr_bool stopCurrent = FALSE;
static tr_lock*
getVerifyLock( void )
{
static tr_lock * lock = NULL;
if( lock == NULL )
lock = tr_lockNew( );
return lock;
}
static void
verifyThreadFunc( void * unused UNUSED )
{
for( ;; )
{
int changed = 0;
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( ) );
tr_torinf( tor, _( "Verifying torrent" ) );
tr_torrentSetVerifyState( tor, TR_VERIFY_NOW );
changed = verifyTorrent( tor, &stopCurrent );
tr_torrentSetVerifyState( tor, TR_VERIFY_NONE );
assert( tr_isTorrent( tor ) );
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 );
assert( tr_isTorrent( tor ) );
if( !uncheckedCount )
{
/* doesn't need to be checked... */
fireCheckDone( tor, verify_done_cb );
}
else
{
struct verify_node * node;
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( ) );
tr_torrentSetVerifyState( tor, TR_VERIFY_WAIT );
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;
}
tr_bool
tr_verifyInProgress( const tr_torrent * tor )
{
tr_bool found = FALSE;
tr_lock * lock = getVerifyLock( );
tr_lockLock( lock );
assert( tr_isTorrent( tor ) );
found = ( tor == currentNode.torrent )
|| ( tr_list_find( verifyList, tor, compareVerifyByTorrent ) != NULL );
tr_lockUnlock( lock );
return found;
}
void
tr_verifyRemove( tr_torrent * tor )
{
tr_lock * lock = getVerifyLock( );
tr_lockLock( lock );
assert( tr_isTorrent( tor ) );
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 );
}
void
tr_verifyClose( tr_session * session UNUSED )
{
tr_lockLock( getVerifyLock( ) );
stopCurrent = TRUE;
tr_list_free( &verifyList, tr_free );
tr_lockUnlock( getVerifyLock( ) );
}
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