2007-12-05 Tatsuhiro Tsujikawa <tujikawa at rednoah dot com>

Enable direct I/O support in checksum checking.
	* src/IteratableChunkChecksumValidator.{h, cc}
	* test/IteratableChunkChecksumValidatorTest.cc
	* src/CheckIntegrityEntry.cc
	* src/PieceHashCheckIntegrityEntry.cc
	* src/IteratableChecksumValidator.{h, cc}
	* src/BtCheckIntegrityEntry.cc: Added doc.

ChangeLog

@@ -1,3 +1,13 @@
+2007-12-05  Tatsuhiro Tsujikawa  <tujikawa at rednoah dot com>
+
+	Enable direct I/O support in checksum checking.
+	* src/IteratableChunkChecksumValidator.{h, cc}
+	* test/IteratableChunkChecksumValidatorTest.cc
+	* src/CheckIntegrityEntry.cc
+	* src/PieceHashCheckIntegrityEntry.cc
+	* src/IteratableChecksumValidator.{h, cc}
+	* src/BtCheckIntegrityEntry.cc: Added doc.
+
 2007-12-04  Tatsuhiro Tsujikawa  <tujikawa at rednoah dot com>
 
 	Added --allow-piece-length-change option.

src/BtCheckIntegrityEntry.cc

@@ -66,5 +66,7 @@ Commands BtCheckIntegrityEntry::onDownloadFinished(DownloadEngine* e)
   // are valid, then aira2 goes to seeding mode. Sometimes it is better
   // to exit rather than doing seeding. So, it would be good to toggle this
   // behavior.
+  // TODO If FileAllocationEntry is not going to be used, call
+  // DiskAdaptor::disableDirectIO() manually here.
   return onDownloadIncomplete(e);
 }

src/CheckIntegrityEntry.cc

@@ -36,14 +36,27 @@
 #include "Command.h"
 #include "RequestGroup.h"
 #include "IteratableValidator.h"
+#include "prefs.h"
+#include "PieceStorage.h"
+#include "DownloadContext.h"
+#include "DiskAdaptor.h"
+#include "Option.h"
 
 CheckIntegrityEntry::CheckIntegrityEntry(RequestGroup* requestGroup,
 					 Command* nextCommand):
   RequestGroupEntry(requestGroup, nextCommand),
   _validator(0)
-{}
+{
+  if(_requestGroup->getOption()->getAsBool(PREF_ENABLE_DIRECT_IO) &&
+     _requestGroup->getDownloadContext()->getFileEntries().size() == 1) {
+    _requestGroup->getPieceStorage()->getDiskAdaptor()->enableDirectIO();
+  }
+}
 
-CheckIntegrityEntry::~CheckIntegrityEntry() {}
+CheckIntegrityEntry::~CheckIntegrityEntry()
+{
+  // TODO DiskAdaptor::disableIO() will be called from ~FileAllocationEntry
+}
 
 void CheckIntegrityEntry::validateChunk()
 {

src/IteratableChecksumValidator.cc

@@ -43,7 +43,8 @@
 #include "DiskAdaptor.h"
 #include "BitfieldMan.h"
 
-#define BUFSIZE 16*1024
+#define BUFSIZE (256*1024)
+#define ALIGNMENT 512
 
 IteratableChecksumValidator::IteratableChecksumValidator(const SingleFileDownloadContextHandle& dctx,
 							 const PieceStorageHandle& pieceStorage):
@@ -51,16 +52,21 @@ IteratableChecksumValidator::IteratableChecksumValidator(const SingleFileDownloa
   _pieceStorage(pieceStorage),
   _currentOffset(0),
   _ctx(0),
-  _logger(LogFactory::getInstance()) {}
+  _logger(LogFactory::getInstance()),
+  _buffer(0) {}
 
-IteratableChecksumValidator::~IteratableChecksumValidator() {}
+IteratableChecksumValidator::~IteratableChecksumValidator()
+{
+  delete [] _buffer;
+}
 
 void IteratableChecksumValidator::validateChunk()
 {
   if(!finished()) {
-    unsigned char data[BUFSIZE];
-    int32_t length = _pieceStorage->getDiskAdaptor()->readData(data, sizeof(data), _currentOffset);
-    _ctx->digestUpdate(data, length);
+    int32_t length = _pieceStorage->getDiskAdaptor()->readData(_buffer,
+							       BUFSIZE,
+							       _currentOffset);
+    _ctx->digestUpdate(_buffer, length);
     _currentOffset += length;
     if(finished()) {
       string actualChecksum = Util::toHex((const unsigned char*)_ctx->digestFinal().c_str(), _ctx->digestLength());
@@ -86,6 +92,11 @@ int64_t IteratableChecksumValidator::getTotalLength() const
 
 void IteratableChecksumValidator::init()
 {
+#ifdef HAVE_POSIX_MEMALIGN
+  _buffer = (unsigned char*)Util::allocateAlignedMemory(ALIGNMENT, BUFSIZE);
+#else
+  _buffer = new unsigned char[BUFSIZE];
+#endif // HAVE_POSIX_MEMALIGN
   _currentOffset = 0;
   _ctx = new MessageDigestContext();
   _ctx->trySetAlgo(_dctx->getChecksumHashAlgo());

src/IteratableChecksumValidator.h

@@ -58,6 +58,8 @@ private:
 
   const Logger* _logger;
 
+  unsigned char* _buffer;
+
 public:
   IteratableChecksumValidator(const SingleFileDownloadContextHandle& dctx,
 			      const PieceStorageHandle& pieceStorage);

src/IteratableChunkChecksumValidator.cc

@@ -43,6 +43,11 @@
 #include "BitfieldMan.h"
 #include "LogFactory.h"
 #include "Logger.h"
+#include "messageDigest.h"
+#include <cerrno>
+
+#define BUFSIZE (256*1024)
+#define ALIGNMENT 512
 
 IteratableChunkChecksumValidator::
 IteratableChunkChecksumValidator(const DownloadContextHandle& dctx,
@@ -51,9 +56,14 @@ IteratableChunkChecksumValidator(const DownloadContextHandle& dctx,
   _pieceStorage(pieceStorage),
   _bitfield(new BitfieldMan(_dctx->getPieceLength(), _dctx->getTotalLength())),
   _currentIndex(0),
-  _logger(LogFactory::getInstance()) {}
+  _logger(LogFactory::getInstance()),
+  _ctx(0),
+  _buffer(0) {}
 
-IteratableChunkChecksumValidator::~IteratableChunkChecksumValidator() {}
+IteratableChunkChecksumValidator::~IteratableChunkChecksumValidator()
+{
+  delete [] _buffer;
+}
 
 
 void IteratableChunkChecksumValidator::validateChunk()
@@ -96,17 +106,55 @@ string IteratableChunkChecksumValidator::calculateActualChecksum()
   } else {
     length = _dctx->getPieceLength();
   }
-  return MessageDigestHelper::digest(_dctx->getPieceHashAlgo(),
-				     _pieceStorage->getDiskAdaptor(),
-				     offset, length);
+  return digest(offset, length);
 }
 
 void IteratableChunkChecksumValidator::init()
 {
+#ifdef HAVE_POSIX_MEMALIGN
+  _buffer = (unsigned char*)Util::allocateAlignedMemory(ALIGNMENT, BUFSIZE);
+#else
+  _buffer = new unsigned char[BUFSIZE];
+#endif // HAVE_POSIX_MEMALIGN
+  _ctx = new MessageDigestContext();
+  _ctx->trySetAlgo(_dctx->getPieceHashAlgo());
+  _ctx->digestInit();
   _bitfield->clearAllBit();
   _currentIndex = 0;
 }
 
+string IteratableChunkChecksumValidator::digest(int64_t offset, int32_t length)
+{
+  _ctx->digestReset();
+  int64_t curoffset = offset/ALIGNMENT*ALIGNMENT;
+  int64_t max = offset+length;
+  int32_t woffset;
+  if(curoffset < offset) {
+    woffset = offset-curoffset;
+  } else {
+    woffset = 0;
+  }
+  while(curoffset < max) {
+    int32_t r = _pieceStorage->getDiskAdaptor()->readData(_buffer, BUFSIZE,
+							  curoffset);
+    if(r == 0) {
+      throw new DlAbortEx(EX_FILE_READ, _dctx->getActualBasePath().c_str(),
+			  strerror(errno));
+    }
+    int32_t wlength;
+    if(max < curoffset+r) {
+      wlength = max-curoffset-woffset;
+    } else {
+      wlength = r-woffset;
+    }
+    _ctx->digestUpdate(_buffer+woffset, wlength);
+    curoffset += r;
+    woffset = 0;
+  }
+  return Util::toHex((const unsigned char*)_ctx->digestFinal().c_str(), _ctx->digestLength());
+}
+
+
 bool IteratableChunkChecksumValidator::finished() const
 {
   return _currentIndex >= (uint32_t)_dctx->getNumPieces();

src/IteratableChunkChecksumValidator.h

@@ -43,6 +43,8 @@ class PieceStorage;
 typedef SharedHandle<PieceStorage> PieceStorageHandle;
 class BitfieldMan;
 class Logger;
+class MessageDigestContext;
+typedef SharedHandle<MessageDigestContext> MessageDigestContextHandle;
 
 class IteratableChunkChecksumValidator:public IteratableValidator
 {
@@ -52,8 +54,13 @@ private:
   BitfieldMan* _bitfield;
   uint32_t _currentIndex;
   const Logger* _logger;
+  MessageDigestContextHandle _ctx;
+  unsigned char* _buffer;
 
   string calculateActualChecksum();
+
+  string digest(int64_t offset, int32_t length);
+
 public:
   IteratableChunkChecksumValidator(const DownloadContextHandle& dctx,
 				   const PieceStorageHandle& pieceStorage);

src/PieceHashCheckIntegrityEntry.cc

@@ -58,6 +58,7 @@ void PieceHashCheckIntegrityEntry::initValidator()
   IteratableChunkChecksumValidatorHandle validator =
     new IteratableChunkChecksumValidator(_requestGroup->getDownloadContext(),
 					 _requestGroup->getPieceStorage());
+  validator->init();
   _validator = validator;
 #endif // ENABLE_MESSAGE_DIGEST
 }

test/IteratableChunkChecksumValidatorTest.cc

@@ -40,7 +40,8 @@ void IteratableChunkChecksumValidatorTest::testValidate() {
   ps->getDiskAdaptor()->openFile();
 
   IteratableChunkChecksumValidator validator(dctx, ps);
-  
+  validator.init();
+
   validator.validateChunk();
   CPPUNIT_ASSERT(!validator.finished());
   validator.validateChunk();