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block_hasher.c
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block_hasher.c
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/*
* block_hasher - Hash device blocks in multiple threads
*
* This file contains __testing__ program `block_hasher` that reads block device
* in multiple threads and calculates hashes on blocks of given size.
*
* Copyright (c) 2014 Alex Dzyoba <avd@reduct.ru>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.*
*/
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <stdbool.h>
#include <fcntl.h>
#include <time.h>
#include <pthread.h>
#include <openssl/evp.h>
#define OPTSTR "d:b:t:n:h"
#define DEV_PATH_LEN 64
// strtol error handling
#define strtol_handle(x) \
if( *errptr != 0 || errno == ERANGE) \
{\
fprintf(stderr, "Argument invalid\n");\
return EXIT_FAILURE;\
}
// pthread functions error handling
#define pthread_handle(err, str) \
if( err )\
{\
errno = err;\
perror(str);\
free(job_info);\
pthread_attr_destroy( &tattr );\
return EXIT_FAILURE;\
}
#define get_clock( t ) \
err = clock_gettime( CLOCK_MONOTONIC, t );\
if( err )\
{\
perror("clock_gettime");\
pthread_exit(NULL);\
}
// Store info about opened block device
struct block_device
{
int fd;
off_t size; // in bytes
};
// Information for thread.
// Used as thread function argument.
struct job
{
pthread_t id;
int num;
off_t off;
unsigned char digest[EVP_MAX_MD_SIZE];
unsigned int digest_len;
double bps; // Bytes per sec
};
// Global parameters set from arguments
int block_size = -1;
int num_threads = -1;
int num_blocks = -1;
// Shared variables
struct block_device *bdev;
FILE *file;
pthread_mutex_t file_mutex;
// ============================================================================
void usage()
{
printf("usage: block_summer -d <device> -b <block size> -t <thread number> -n [blocks number]\n");
}
double time_diff(struct timespec start, struct timespec end)
{
struct timespec diff;
double sec;
if ( (end.tv_nsec - start.tv_nsec) < 0 )
{
diff.tv_sec = end.tv_sec - start.tv_sec - 1;
diff.tv_nsec = 1000000000 + end.tv_nsec - start.tv_nsec;
}
else
{
diff.tv_sec = end.tv_sec - start.tv_sec;
diff.tv_nsec = end.tv_nsec - start.tv_nsec;
}
sec = (double)diff.tv_nsec / 1000000000 + diff.tv_sec;
return sec;
}
// ============================================================================
void *thread_func(void *arg)
{
struct job *j = arg;
long total_blocks, nblocks, i;
off_t offset, gap;
char *buf;
int err;
EVP_MD_CTX *mdctx;
const EVP_MD *md;
struct timespec start, end;
double sec_diff;
unsigned long long bytes = 0;
buf = malloc(block_size);
if( !buf )
{
fprintf(stderr, "Failed to allocate buffers\n");
pthread_exit(NULL);
}
if( num_blocks != -1 )
{
nblocks = num_blocks;
}
else
{
total_blocks = bdev->size / block_size;
nblocks = total_blocks / num_threads;
}
gap = num_threads * block_size; // Multiply here to avoid integer overflow
// Initialize EVP and start reading
md = EVP_sha1();
mdctx = EVP_MD_CTX_create();
EVP_DigestInit_ex( mdctx, md, NULL );
get_clock( &start );
for( i = 0; i < nblocks; i++)
{
offset = j->off + gap * i;
// Read at offset without changing file pointer
err = pread( bdev->fd, buf, block_size, offset );
if( err == -1 )
{
fprintf(stderr, "T%02d Failed to read at %llu\n", j->num, (unsigned long long)offset);
perror("pread");
pthread_exit(NULL);
}
bytes += err; // On success pread returns bytes read
// Update digest
EVP_DigestUpdate( mdctx, buf, block_size );
}
get_clock( &end );
sec_diff = time_diff( start, end );
EVP_DigestFinal_ex( mdctx, j->digest, &j->digest_len );
EVP_MD_CTX_destroy(mdctx);
// Write job summary
pthread_mutex_lock( &file_mutex );
i = 0;
fprintf(file, "T%02d: ", j->num);
fprintf(file, "%.2f MB/s ", (double)bytes / sec_diff / 1000000);
while(i++ < j->digest_len)
{
fprintf(file, "%02x", j->digest[i]);
}
fprintf(file, "\n");
pthread_mutex_unlock( &file_mutex );
free(buf);
return NULL;
}
// ============================================================================
struct block_device *bdev_open( char *dev_path )
{
struct block_device *dev;
dev = malloc(sizeof(*dev));
dev->fd = open( dev_path, O_RDONLY );
if( dev->fd == -1 )
{
perror("open");
return 0;
}
dev->size = lseek(dev->fd, 0, SEEK_END);
if( dev->size == -1 )
{
perror("lseek");
return NULL;
}
return dev;
}
// ============================================================================
void bdev_close( struct block_device *dev )
{
int err;
err = close( dev->fd );
if( err == -1 )
{
perror("close");
}
free(dev);
dev = NULL;
return;
}
// ============================================================================
int main(int argc, char *argv[])
{
char dev_path[DEV_PATH_LEN];
bool dev_set = false, block_size_set = false, num_threads_set = false;
char *errptr;
struct job *job_info;
pthread_attr_t tattr;
int err;
int opt;
int i;
// --------------------------------------------
// Parse arguments
// --------------------------------------------
while((opt = getopt(argc, argv, OPTSTR)) != -1)
{
switch(opt)
{
case 'd':
strncpy(dev_path, optarg, DEV_PATH_LEN);
dev_set = true;
break;
case 'b':
block_size = strtol(optarg, &errptr, 10);
strtol_handle(block_size);
block_size_set = true;
break;
case 't':
num_threads = strtol(optarg, &errptr, 10);
strtol_handle(num_threads);
num_threads_set = true;
break;
case 'n':
num_blocks = strtol(optarg, &errptr, 10);
strtol_handle(num_blocks);
break;
case 'h':
usage();
return EXIT_SUCCESS;
default:
usage();
return EXIT_FAILURE;
}
}
// Check mandatory options
if( !( dev_set && block_size_set && num_threads_set ) )
{
usage();
return EXIT_FAILURE;
}
// ------------------------
// Open block device
// ------------------------
bdev = bdev_open(dev_path);
if( bdev == NULL)
{
return EXIT_FAILURE;
}
// ------------------------
// Open output file
// ------------------------
file = fopen("digest.out", "w");
if( file == NULL )
{
perror("fopen");
return EXIT_FAILURE;
}
// --------------------------------------------------------
// Create and run threads
// --------------------------------------------------------
job_info = calloc( num_threads, sizeof(struct job) );
if( job_info == NULL )
{
fprintf(stderr, "Failed to allocate memory\n");
free(job_info);
return EXIT_FAILURE;
}
err = pthread_attr_init( &tattr );
pthread_handle(err, "pthread_attr_init");
err = pthread_mutex_init(&file_mutex, NULL);
pthread_handle(err, "pthread_mutex_init");
for( i = 0; i < num_threads; i++ )
{
job_info[i].num = i;
job_info[i].off = i * block_size;
err = pthread_create( &job_info[i].id,
&tattr,
&thread_func,
&job_info[i] );
pthread_handle(err, "pthread_create");
}
// Wait for threads to join
for( i = 0; i < num_threads; i++ )
{
err = pthread_join( job_info[i].id, NULL );
pthread_handle(err, "pthread_join");
}
// Housekeeping
bdev_close( bdev );
fclose(file);
free(job_info);
pthread_attr_destroy( &tattr );
return EXIT_SUCCESS;
}