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transmission/libtransmission/verify.c

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/*
* This file Copyright (C) 2007-2014 Mnemosyne LLC
*
* It may be used under the GNU GPL versions 2 or 3
* or any future license endorsed by Mnemosyne LLC.
*
*/
#if defined(HAVE_POSIX_FADVISE) && (!defined(_XOPEN_SOURCE) || _XOPEN_SOURCE < 600)
#undef _XOPEN_SOURCE
#define _XOPEN_SOURCE 600
#endif
#include <string.h> /* memcmp() */
#include <stdlib.h> /* free() */
#ifdef HAVE_POSIX_FADVISE
#include <fcntl.h> /* posix_fadvise() */
#endif
#include "transmission.h"
#include "completion.h"
#include "crypto-utils.h"
#include "file.h"
#include "list.h"
#include "log.h"
#include "platform.h" /* tr_lock() */
#include "torrent.h"
#include "utils.h" /* tr_valloc(), tr_free() */
#include "verify.h"
/***
****
***/
enum
{
MSEC_TO_SLEEP_PER_SECOND_DURING_VERIFY = 100
};
static bool verifyTorrent(tr_torrent* tor, bool* stopFlag)
{
time_t end;
tr_sha1_ctx_t sha;
tr_sys_file_t fd = TR_BAD_SYS_FILE;
uint64_t filePos = 0;
bool changed = false;
bool hadPiece = false;
time_t lastSleptAt = 0;
uint32_t piecePos = 0;
tr_file_index_t fileIndex = 0;
tr_file_index_t prevFileIndex = !fileIndex;
tr_piece_index_t pieceIndex = 0;
time_t const begin = tr_time();
size_t const buflen = 1024 * 128; /* 128 KiB buffer */
uint8_t* buffer = tr_valloc(buflen);
sha = tr_sha1_init();
tr_logAddTorDbg(tor, "%s", "verifying torrent...");
tr_torrentSetChecked(tor, 0);
while (!*stopFlag && pieceIndex < tor->info.pieceCount)
{
uint64_t leftInPiece;
uint64_t bytesThisPass;
uint64_t leftInFile;
tr_file const* file = &tor->info.files[fileIndex];
/* if we're starting a new piece... */
if (piecePos == 0)
{
hadPiece = tr_torrentPieceIsComplete(tor, pieceIndex);
}
/* if we're starting a new file... */
if (filePos == 0 && fd == TR_BAD_SYS_FILE && fileIndex != prevFileIndex)
{
char* filename = tr_torrentFindFile(tor, fileIndex);
fd = filename == NULL ? TR_BAD_SYS_FILE : tr_sys_file_open(filename, TR_SYS_FILE_READ | TR_SYS_FILE_SEQUENTIAL, 0,
NULL);
tr_free(filename);
prevFileIndex = fileIndex;
}
/* 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);
/* read a bit */
if (fd != TR_BAD_SYS_FILE)
{
uint64_t numRead;
if (tr_sys_file_read_at(fd, buffer, bytesThisPass, filePos, &numRead, NULL) && numRead > 0)
{
bytesThisPass = numRead;
tr_sha1_update(sha, buffer, bytesThisPass);
#if defined HAVE_POSIX_FADVISE && defined POSIX_FADV_DONTNEED
(void)posix_fadvise(fd, filePos, bytesThisPass, POSIX_FADV_DONTNEED);
#endif
}
}
/* move our offsets */
leftInPiece -= bytesThisPass;
leftInFile -= bytesThisPass;
piecePos += bytesThisPass;
filePos += bytesThisPass;
/* if we're finishing a piece... */
if (leftInPiece == 0)
{
time_t now;
bool hasPiece;
uint8_t hash[SHA_DIGEST_LENGTH];
tr_sha1_final(sha, hash);
hasPiece = memcmp(hash, tor->info.pieces[pieceIndex].hash, SHA_DIGEST_LENGTH) == 0;
if (hasPiece || hadPiece)
{
tr_torrentSetHasPiece(tor, pieceIndex, hasPiece);
changed |= hasPiece != hadPiece;
}
tr_torrentSetPieceChecked(tor, pieceIndex);
now = tr_time();
tor->anyDate = now;
/* sleeping even just a few msec per second goes a long
* way towards reducing IO load... */
if (lastSleptAt != now)
{
lastSleptAt = now;
tr_wait_msec(MSEC_TO_SLEEP_PER_SECOND_DURING_VERIFY);
}
sha = tr_sha1_init();
pieceIndex++;
piecePos = 0;
}
/* if we're finishing a file... */
if (leftInFile == 0)
{
if (fd != TR_BAD_SYS_FILE)
{
tr_sys_file_close(fd, NULL);
fd = TR_BAD_SYS_FILE;
}
fileIndex++;
filePos = 0;
}
}
/* cleanup */
if (fd != TR_BAD_SYS_FILE)
{
tr_sys_file_close(fd, NULL);
}
tr_sha1_final(sha, NULL);
free(buffer);
/* stopwatch */
end = tr_time();
tr_logAddTorDbg(tor, "Verification is done. It took %d seconds to verify %" PRIu64 " bytes (%" PRIu64 " bytes per second)",
(int)(end - begin), tor->info.totalSize, (uint64_t)(tor->info.totalSize / (1 + (end - begin))));
return changed;
}
/***
****
***/
struct verify_node
{
tr_torrent* torrent;
tr_verify_done_func callback_func;
void* callback_data;
uint64_t current_size;
};
static struct verify_node currentNode;
static tr_list* verifyList = NULL;
static tr_thread* verifyThread = NULL;
static 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 (;;)
{
bool changed = false;
tr_torrent* tor;
struct verify_node* node;
tr_lockLock(getVerifyLock());
stopCurrent = false;
node = verifyList != NULL ? 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_logAddTorInfo(tor, "%s", _("Verifying torrent"));
tr_torrentSetVerifyState(tor, TR_VERIFY_NOW);
changed = verifyTorrent(tor, &stopCurrent);
tr_torrentSetVerifyState(tor, TR_VERIFY_NONE);
assert(tr_isTorrent(tor));
if (!stopCurrent && changed)
{
tr_torrentSetDirty(tor);
}
if (currentNode.callback_func != NULL)
{
(*currentNode.callback_func)(tor, stopCurrent, currentNode.callback_data);
}
}
verifyThread = NULL;
tr_lockUnlock(getVerifyLock());
}
static int compareVerifyByPriorityAndSize(void const* va, void const* vb)
{
struct verify_node const* a = va;
struct verify_node const* b = vb;
/* higher priority comes before lower priority */
tr_priority_t const pa = tr_torrentGetPriority(a->torrent);
tr_priority_t const pb = tr_torrentGetPriority(b->torrent);
if (pa != pb)
{
return pa > pb ? -1 : 1;
}
/* smaller torrents come before larger ones because they verify faster */
if (a->current_size < b->current_size)
{
return -1;
}
if (a->current_size > b->current_size)
{
return 1;
}
return 0;
}
void tr_verifyAdd(tr_torrent* tor, tr_verify_done_func callback_func, void* callback_data)
{
struct verify_node* node;
assert(tr_isTorrent(tor));
tr_logAddTorInfo(tor, "%s", _("Queued for verification"));
node = tr_new(struct verify_node, 1);
node->torrent = tor;
node->callback_func = callback_func;
node->callback_data = callback_data;
node->current_size = tr_torrentGetCurrentSizeOnDisk(tor);
tr_lockLock(getVerifyLock());
tr_torrentSetVerifyState(tor, TR_VERIFY_WAIT);
tr_list_insert_sorted(&verifyList, node, compareVerifyByPriorityAndSize);
if (verifyThread == NULL)
{
verifyThread = tr_threadNew(verifyThreadFunc, NULL);
}
tr_lockUnlock(getVerifyLock());
}
static int compareVerifyByTorrent(void const* va, void const* vb)
{
struct verify_node const* a = va;
tr_torrent const* b = vb;
return a->torrent - b;
}
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_msec(100);
tr_lockLock(lock);
}
}
else
{
struct verify_node* node = tr_list_remove(&verifyList, tor, compareVerifyByTorrent);
tr_torrentSetVerifyState(tor, TR_VERIFY_NONE);
if (node != NULL)
{
if (node->callback_func != NULL)
{
(*node->callback_func)(tor, true, node->callback_data);
}
tr_free(node);
}
}
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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