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XrdFileCacheVRead.cc
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XrdFileCacheVRead.cc
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#include "XrdFileCacheFile.hh"
#include "XrdFileCache.hh"
#include "XrdFileCacheTrace.hh"
#include "XrdFileCacheInfo.hh"
#include "XrdFileCacheStats.hh"
#include "XrdFileCacheIO.hh"
#include "XrdOss/XrdOss.hh"
#include "XrdCl/XrdClDefaultEnv.hh"
#include "XrdCl/XrdClFile.hh"
#include "XrdCl/XrdClXRootDResponses.hh"
#include "XrdPosix/XrdPosixFile.hh"
namespace XrdFileCache {
// a list of IOVec chuncks that match a given block index
// first element is block index, the following vector elements are chunk readv indicies
struct ReadVChunkListDisk {
ReadVChunkListDisk(int i) : block_idx(i) {};
int block_idx;
std::vector <int> arr;
};
struct ReadVChunkListRAM {
ReadVChunkListRAM(Block*b, std::vector <int>* iarr) : block(b), arr(iarr) { };
Block* block;
std::vector <int>* arr;
};
// RAM
struct ReadVBlockListRAM {
std::vector<XrdFileCache::ReadVChunkListRAM> bv;
bool AddEntry(Block* block, int chunkIdx)
{
for ( std::vector<ReadVChunkListRAM>::iterator i = bv.begin(); i != bv.end(); ++i)
{
if (i->block == block) {
i->arr->push_back(chunkIdx);
return false;
}
}
bv.push_back(ReadVChunkListRAM(block, new std::vector<int>));
bv.back().arr->push_back(chunkIdx);
return true;
}
};
// Disk
struct ReadVBlockListDisk {
std::vector<ReadVChunkListDisk> bv;
void AddEntry(int blockIdx, int chunkIdx)
{
for ( std::vector<ReadVChunkListDisk>::iterator i = bv.begin(); i != bv.end(); ++i)
{
if (i->block_idx == blockIdx) {
i->arr.push_back(chunkIdx);
return;
}
}
bv.push_back(XrdFileCache::ReadVChunkListDisk(blockIdx));
bv.back().arr.push_back(chunkIdx);
}
};
}
using namespace XrdFileCache;
//-------------------------------------
int File::ReadV (const XrdOucIOVec *readV, int n)
{
TRACEF(Dump, "ReadV for %d chunks " << n);
int bytesRead = 0;
ReadVBlockListRAM blocks_to_process;
std::vector<ReadVChunkListRAM> blks_processed;
ReadVBlockListDisk blocks_on_disk;
std::vector<XrdOucIOVec> chunkVec;
DirectResponseHandler* direct_handler = 0;
if (!VReadPreProcess(readV, n, blocks_to_process, blocks_on_disk, chunkVec))
bytesRead = -1;
// issue a client read
if (bytesRead >= 0) {
if (!chunkVec.empty()) {
direct_handler = new DirectResponseHandler(1);
// TODO check interface in the client file
// m_input.VectorRead(chunkVec, (void*) 0, direct_handler);
m_io->GetInput()->ReadV(*direct_handler, &chunkVec[0], chunkVec.size());
}
}
// disk read
if (bytesRead >= 0) {
int dr = VReadFromDisk(readV, n, blocks_on_disk);
if (dr < 0)
bytesRead = dr;
else
bytesRead += dr;
}
// read from cached blocks
if (bytesRead >=0) {
int br = VReadProcessBlocks(readV, n, blocks_to_process.bv, blks_processed);
if (br < 0)
bytesRead = br;
else
bytesRead += br;
}
// check direct requests have arrived, get bytes read from read handle
if (bytesRead >=0 && direct_handler != 0)
{
XrdSysCondVarHelper _lck(direct_handler->m_cond);
if (direct_handler->m_to_wait == 1)
{
direct_handler->m_cond.Wait();
}
if (direct_handler->m_errno == 0)
{
for (std::vector<XrdOucIOVec>::iterator i = chunkVec.begin(); i != chunkVec.end(); ++i)
{
bytesRead += i->size;
m_stats.m_BytesMissed += i->size;
}
}
else
{
errno = direct_handler->m_errno;
bytesRead = -1;
}
}
{
XrdSysCondVarHelper _lck(m_downloadCond);
// decrease ref count on the remaining blocks
// this happens in case read process has been broke due to previous errors
for (std::vector<ReadVChunkListRAM>::iterator i = blocks_to_process.bv.begin(); i != blocks_to_process.bv.end(); ++i)
dec_ref_count(i->block);
for (std::vector<ReadVChunkListRAM>::iterator i = blks_processed.begin(); i != blks_processed.end(); ++i)
dec_ref_count(i->block);
}
// remove objects on heap
delete direct_handler;
for (std::vector<ReadVChunkListRAM>::iterator i = blocks_to_process.bv.begin(); i != blocks_to_process.bv.end(); ++i)
delete i->arr;
for (std::vector<ReadVChunkListRAM>::iterator i = blks_processed.begin(); i != blks_processed.end(); ++i)
delete i->arr;
TRACEF(Dump, "VRead exit, total = " << bytesRead);
return bytesRead;
}
//______________________________________________________________________________
bool File::VReadPreProcess(const XrdOucIOVec *readV, int n, ReadVBlockListRAM& blocks_to_process, ReadVBlockListDisk& blocks_on_disk, std::vector<XrdOucIOVec>& chunkVec)
{
XrdSysCondVarHelper _lck(m_downloadCond);
for (int iov_idx=0; iov_idx<n; iov_idx++)
{
const int blck_idx_first = readV[iov_idx].offset / m_cfi.GetBufferSize();
const int blck_idx_last = (readV[iov_idx].offset + readV[iov_idx].size - 1) / m_cfi.GetBufferSize();
for (int block_idx = blck_idx_first; block_idx <= blck_idx_last; ++block_idx)
{
TRACEF(Dump, "VReadPreProcess chunk "<< readV[iov_idx].size << "@"<< readV[iov_idx].offset);
BlockMap_i bi = m_block_map.find(block_idx);
if (bi != m_block_map.end())
{
if ( blocks_to_process.AddEntry(bi->second, iov_idx))
inc_ref_count(bi->second);
TRACEF(Dump, "VReadPreProcess block "<< block_idx <<" in map");
}
else if (m_cfi.TestBit(offsetIdx(block_idx)))
{
blocks_on_disk.AddEntry(block_idx, iov_idx);
TRACEF(Dump, "VReadPreProcess block "<< block_idx <<" , chunk idx = " << iov_idx << " on disk");
}
else {
if ( Cache::GetInstance().HaveFreeWritingSlots() && Cache::GetInstance().RequestRAMBlock())
{
Block *b = RequestBlock(block_idx, false);
if (!b) return false;
blocks_to_process.AddEntry(b, iov_idx);
TRACEF(Dump, "VReadPreProcess request block " << block_idx);
inc_ref_count(b);
}
else {
long long off; // offset in user buffer
long long blk_off; // offset in block
long long size; // size to copy
const long long BS = m_cfi.GetBufferSize();
overlap(block_idx, BS, readV[iov_idx].offset, readV[iov_idx].size, off, blk_off, size);
chunkVec.push_back(XrdOucIOVec2(readV[iov_idx].data+off, BS*block_idx + blk_off,size));
TRACEF(Dump, "VReadPreProcess direct read " << block_idx);
}
}
}
}
return true;
}
//-----------------------------------------------------------------------------------
int File::VReadFromDisk(const XrdOucIOVec *readV, int n, ReadVBlockListDisk& blocks_on_disk)
{
int bytes_read = 0;
for (std::vector<ReadVChunkListDisk>::iterator bit = blocks_on_disk.bv.begin(); bit != blocks_on_disk.bv.end(); ++bit )
{
int blockIdx = bit->block_idx;
for (std::vector<int>::iterator chunkIt = bit->arr.begin(); chunkIt != bit->arr.end(); ++chunkIt)
{
int chunkIdx = *chunkIt;
long long off; // offset in user buffer
long long blk_off; // offset in block
long long size; // size to copy
TRACEF(Dump, "VReadFromDisk block= " << blockIdx <<" chunk=" << chunkIdx);
overlap(blockIdx, m_cfi.GetBufferSize(), readV[chunkIdx].offset, readV[chunkIdx].size, off, blk_off, size);
int rs = m_output->Read(readV[chunkIdx].data + off, blockIdx*m_cfi.GetBufferSize() + blk_off - m_offset, size);
if (rs >=0 ) {
bytes_read += rs;
m_stats.m_BytesDisk += rs;
}
else {
// ofs read should set the errno
TRACEF(Error, "VReadFromDisk FAILED block=" << blockIdx << " chunk=" << chunkIdx << " off= " << off << " blk_off=" << blk_off << " size = " << size << "chunOff " << readV[chunkIdx].offset);
return -1;
}
}
}
return bytes_read;
}
//______________________________________________________________________________
int File::VReadProcessBlocks(const XrdOucIOVec *readV, int n,
std::vector<ReadVChunkListRAM>& blocks_to_process, std::vector<ReadVChunkListRAM>& blocks_processed)
{
int bytes_read = 0;
while ( (! blocks_to_process.empty()) && (bytes_read >= 0))
{
std::vector<ReadVChunkListRAM> finished;
{
XrdSysCondVarHelper _lck(m_downloadCond);
std::vector<ReadVChunkListRAM>::iterator bi = blocks_to_process.begin();
while (bi != blocks_to_process.end())
{
if (bi->block->is_finished())
{
finished.push_back(ReadVChunkListRAM(bi->block, bi->arr));
// std::vector<ReadVChunkListRAM>::iterator bj = bi++;
blocks_to_process.erase(bi);
}
else
{
++bi;
}
}
if (finished.empty())
{
m_downloadCond.Wait();
continue;
}
}
std::vector<ReadVChunkListRAM>::iterator bi = finished.begin();
while (bi != finished.end())
{
if (bi->block->is_ok()) {
for ( std::vector<int>::iterator chunkIt = bi->arr->begin(); chunkIt < bi->arr->end(); ++chunkIt ) {
long long off; // offset in user buffer
long long blk_off; // offset in block
long long size; // size to copy
int block_idx =bi->block->m_offset/m_cfi.GetBufferSize();
overlap(block_idx, m_cfi.GetBufferSize(), readV[*chunkIt].offset, readV[*chunkIt].size, off, blk_off, size);
memcpy(readV[*chunkIt].data + off, &(bi->block->m_buff[blk_off]), size);
bytes_read += size;
m_stats.m_BytesRam += size;
}
}
else {
bytes_read = -1;
errno = bi->block->m_errno;
break;
}
++bi;
}
// add finished to processed list
std::copy(finished.begin(), finished.end(), std::back_inserter(blocks_processed));
finished.clear();
}
TRACEF(Dump, "VReadProcessBlocks total read " << bytes_read);
return bytes_read;
}