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// --------------------------------------------------------------------------
//
// File
// Name: RaidFileUtil.cpp
// Purpose: Utilities for raid files
// Created: 2003/07/11
//
// --------------------------------------------------------------------------
#include "Box.h"
#include <sys/types.h>
#include <sys/stat.h>
#include "RaidFileUtil.h"
#include "FileModificationTime.h"
#include "RaidFileRead.h" // for type definition
#include "MemLeakFindOn.h"
int64_t adjust_timestamp(int64_t timestamp, size_t file_size)
{
#ifndef BOX_RELEASE_BUILD
// Remove the microseconds part of the timestamp,
// to simulate filesystem with 1-second timestamp
// resolution, e.g. MacOS X HFS, old Linuxes.
// Otherwise it's easy to write tests that rely
// on more accurate timestamps, and pass on
// platforms that have them, and fail on others.
timestamp -= (timestamp % MICRO_SEC_IN_SEC);
#endif
// The resolution of timestamps may be very
// low, e.g. 1 second. So add the size to it
// to give a bit more chance of it changing.
// TODO: Make this better.
timestamp += file_size;
return timestamp;
}
// --------------------------------------------------------------------------
//
// Function
// Name: RaidFileUtil::RaidFileExists(RaidFileDiscSet &,
// const std::string &, int *, int *, int64_t *)
// Purpose: Check to see the state of a RaidFile on disc
// (doesn't look at contents, just at existence of
// files)
// Created: 2003/07/11
//
// --------------------------------------------------------------------------
RaidFileUtil::ExistType RaidFileUtil::RaidFileExists(RaidFileDiscSet &rDiscSet,
const std::string &rFilename, int *pStartDisc, int *pExistingFiles,
int64_t *pRevisionID)
{
if(pExistingFiles)
{
*pExistingFiles = 0;
}
// For stat call, although the results are not examined
struct stat st;
// check various files
int startDisc = 0;
{
std::string writeFile(RaidFileUtil::MakeWriteFileName(rDiscSet, rFilename, &startDisc));
if(pStartDisc)
{
*pStartDisc = startDisc;
}
if(::stat(writeFile.c_str(), &st) == 0)
{
// write file exists, use that
// Get unique ID
if(pRevisionID != 0)
{
#ifdef WIN32
*pRevisionID = st.st_mtime;
#else
*pRevisionID = FileModificationTime(st);
#endif
*pRevisionID = adjust_timestamp(*pRevisionID, st.st_size);
}
// return non-raid file
return NonRaid;
}
}
// Now see how many of the raid components exist
int64_t revisionID = 0;
int setSize = rDiscSet.size();
int rfCount = 0;
// TODO: replace this with better linux revision ID detection
int64_t revisionIDplus = 0;
for(int f = 0; f < setSize; ++f)
{
std::string componentFile(RaidFileUtil::MakeRaidComponentName(rDiscSet, rFilename, (f + startDisc) % setSize));
if(::stat(componentFile.c_str(), &st) == 0)
{
// Component file exists, add to count
rfCount++;
// Set flags for existance?
if(pExistingFiles)
{
(*pExistingFiles) |= (1 << f);
}
// Revision ID
if(pRevisionID != 0)
{
#ifdef WIN32
int64_t rid = st.st_mtime;
#else
int64_t rid = FileModificationTime(st);
#endif
if(rid > revisionID) revisionID = rid;
revisionIDplus += st.st_size;
}
}
}
if(pRevisionID != 0)
{
revisionID = adjust_timestamp(revisionID, revisionIDplus);
(*pRevisionID) = revisionID;
}
// Return a status based on how many parts are available
if(rfCount == setSize)
{
return AsRaid;
}
else if((setSize > 1) && rfCount == (setSize - 1))
{
return AsRaidWithMissingReadable;
}
else if(rfCount > 0)
{
return AsRaidWithMissingNotRecoverable;
}
return NoFile; // Obviously doesn't exist
}
// --------------------------------------------------------------------------
//
// Function
// Name: RaidFileUtil::DiscUsageInBlocks(int64_t, const RaidFileDiscSet &)
// Purpose: Returns the size of the file in blocks, given the file size and disc set
// Created: 2003/09/03
//
// --------------------------------------------------------------------------
int64_t RaidFileUtil::DiscUsageInBlocks(int64_t FileSize, const RaidFileDiscSet &rDiscSet)
{
// Get block size
int blockSize = rDiscSet.GetBlockSize();
// OK... so as the size of the file is always sizes of stripe1 + stripe2, we can
// do a very simple calculation for the main data.
int64_t blocks = (FileSize + (((int64_t)blockSize) - 1)) / ((int64_t)blockSize);
// It's just that simple calculation for non-RAID disc sets
if(rDiscSet.IsNonRaidSet())
{
return blocks;
}
// It's the parity which is mildly complex.
// First of all, add in size for all but the last two blocks.
int64_t parityblocks = (FileSize / ((int64_t)blockSize)) / 2;
blocks += parityblocks;
// Work out how many bytes are left
int bytesOver = (int)(FileSize - (parityblocks * ((int64_t)(blockSize*2))));
// Then... (let compiler optimise this out)
if(bytesOver == 0)
{
// Extra block for the size info
blocks++;
}
else if(bytesOver == sizeof(RaidFileRead::FileSizeType))
{
// For last block of parity, plus the size info
blocks += 2;
}
else if(bytesOver < blockSize)
{
// Just want the parity block
blocks += 1;
}
else if(bytesOver == blockSize || bytesOver >= ((blockSize*2)-((int)sizeof(RaidFileRead::FileSizeType))))
{
// Last block, plus size info
blocks += 2;
}
else
{
// Just want parity block
blocks += 1;
}
return blocks;
}
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