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transmission/libtransmission/verify.c

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/*
* This file Copyright (C) Mnemosyne LLC
*
* 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 <string.h> /* memcmp () */
#include <stdlib.h> /* free () */
#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 "list.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;
SHA_CTX sha;
int fd = -1;
int64_t filePos = 0;
bool changed = 0;
bool hadPiece = 0;
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;
const time_t begin = tr_time ();
const size_t buflen = 1024 * 128; /* 128 KiB buffer */
uint8_t * buffer = tr_valloc (buflen);
SHA1_Init (&sha);
tr_tordbg (tor, "%s", "verifying torrent...");
tr_torrentSetChecked (tor, 0);
while (!*stopFlag && (pieceIndex < tor->info.pieceCount))
{
uint32_t leftInPiece;
uint32_t bytesThisPass;
uint64_t leftInFile;
const tr_file * file = &tor->info.files[fileIndex];
/* if we're starting a new piece... */
if (piecePos == 0)
hadPiece = tr_cpPieceIsComplete (&tor->completion, pieceIndex);
/* if we're starting a new file... */
if (!filePos && (fd<0) && (fileIndex!=prevFileIndex))
{
char * filename = tr_torrentFindFile (tor, fileIndex);
fd = filename == NULL ? -1 : tr_open_file_for_scanning (filename);
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 >= 0)
{
const ssize_t numRead = tr_pread (fd, buffer, bytesThisPass, filePos);
if (numRead > 0)
{
bytesThisPass = (uint32_t)numRead;
SHA1_Update (&sha, buffer, bytesThisPass);
#if defined HAVE_POSIX_FADVISE && defined POSIX_FADV_DONTNEED
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];
SHA1_Final (hash, &sha);
hasPiece = !memcmp (hash, tor->info.pieces[pieceIndex].hash, SHA_DIGEST_LENGTH);
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);
}
SHA1_Init (&sha);
pieceIndex++;
piecePos = 0;
}
/* if we're finishing a file... */
if (leftInFile == 0)
{
if (fd >= 0)
{
tr_close_file (fd);
fd = -1;
}
fileIndex++;
filePos = 0;
}
}
/* cleanup */
if (fd >= 0)
tr_close_file (fd);
free (buffer);
/* stopwatch */
end = tr_time ();
tr_tordbg (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_cb verify_done_cb;
uint64_t current_size;
};
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 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, "%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)
{
if (changed)
tr_torrentSetDirty (tor);
fireCheckDone (tor, currentNode.verify_done_cb);
}
}
verifyThread = NULL;
tr_lockUnlock (getVerifyLock ());
}
static int
compareVerifyByPriorityAndSize (const void * va, const void * vb)
{
const struct verify_node * a = va;
const struct verify_node * b = vb;
/* higher priority comes before lower priority */
const tr_priority_t pa = tr_torrentGetPriority (a->torrent);
const tr_priority_t 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_cb verify_done_cb)
{
struct verify_node * node;
assert (tr_isTorrent (tor));
tr_torinf (tor, "%s", _("Queued for verification"));
node = tr_new (struct verify_node, 1);
node->torrent = tor;
node->verify_done_cb = verify_done_cb;
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 (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);
assert (tr_isTorrent (tor));
if (tor == currentNode.torrent)
{
stopCurrent = true;
while (stopCurrent)
{
tr_lockUnlock (lock);
tr_wait_msec (100);
tr_lockLock (lock);
}
}
else
{
tr_free (tr_list_remove (&verifyList, tor, compareVerifyByTorrent));
tr_torrentSetVerifyState (tor, 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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