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// Copyright 2008 Google Inc. All Rights Reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Interface for a thread-safe container of disk blocks
#ifndef STRESSAPPTEST_DISK_BLOCKS_H_
#define STRESSAPPTEST_DISK_BLOCKS_H_
#include <sys/types.h>
#include <pthread.h>
#include <time.h>
#include <sys/time.h>
#include <errno.h>
#include <map>
#include <vector>
#include <string>
// This file must work with autoconf on its public version,
// so these includes are correct.
#include "pattern.h"
// Data about a block written to disk so that it can be verified later.
class BlockData {
public:
BlockData();
~BlockData();
void SetParameters(int64 address, int64 size);
void IncreaseReferenceCounter();
void DecreaseReferenceCounter();
int GetReferenceCounter();
void SetBlockAsInitialized();
bool BlockIsInitialized();
int64 GetAddress();
int64 GetSize();
void SetPattern(Pattern *p);
Pattern *GetPattern();
protected:
int64 addr_; // address of first sector in block
int64 size_; // size of block
int references_; // reference counter
bool initialized_; // flag indicating the block was written on disk
Pattern *pattern_;
pthread_mutex_t data_mutex_;
DISALLOW_COPY_AND_ASSIGN(BlockData);
};
// Disk Block table - store data from blocks to be write / read by
// a DiskThread
class DiskBlockTable {
public:
DiskBlockTable();
virtual ~DiskBlockTable();
// Get Number of elements stored on table
int64 NumElems();
// Clean all table data
void CleanTable();
// Get a random block from the list. Only returns if a element
// is available (consider that other thread must have added them.
BlockData *GetRandomBlock();
// Set all initial parameters. Assumes all existent data is
// invalid and, therefore, must be removed.
void SetParameters(int sector_size, int write_block_size,
int64 device_sectors,
int64 segment_size,
string device_name);
// Return a new block in a unused address.
BlockData *GetUnusedBlock(int64 segment);
// Remove block from structure (called by write threads)
int RemoveBlock(BlockData *block);
// Release block to be erased (called by random threads)
int ReleaseBlock(BlockData *block);
protected:
void InsertOnStructure(BlockData *block);
// Generate a random 64-bit integer (virtual so it could be
// override by the tests)
virtual int64 Random64();
struct StorageData {
BlockData *block;
int pos;
};
static const int kBlockRetry = 100; // Number of retries to allocate
// sectors.
typedef map<int64, StorageData*> AddrToBlockMap;
typedef vector<int64> PosToAddrVector;
PosToAddrVector pos_to_addr_;
AddrToBlockMap addr_to_block_;
uint64 nelems_;
int sector_size_; // Sector size, in bytes
int write_block_size_; // Block size, in bytes
string device_name_; // Device name
int64 device_sectors_; // Number of sectors in device
int64 segment_size_; // Segment size, in bytes
pthread_mutex_t data_mutex_;
pthread_cond_t data_condition_;
pthread_mutex_t parameter_mutex_;
DISALLOW_COPY_AND_ASSIGN(DiskBlockTable);
};
#endif // STRESSAPPTEST_BLOCKS_H_
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