testcases/kernel/fs/fs-bench/random-access-del-create.c

/* random-del-create.c (GPL)*/
/* Hironobu SUZUKI <hironobu@h2np.net> */

#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <time.h>
#include <stdlib.h>
#define FAIL 0
#define SUCCESS 1

int openlog[2]={0,0};

#define MAXNUM 0x100000

#define  MAXERROR 1024

extern int box_muler(int, int);
extern void create_or_delete(char *);

int delete_file(char *filename);
int create_file(char *filename);

int cfilecount=0;
int dfilecount=0;
int errorcount=0;

int main(int ac, char **av)
{
  int r;
  char fname[1024];
  time_t t;
  int i;
  int m;

  if (ac != 2) {
    printf("%s hex-style-filename \n", av[0]);
    printf("ex) %s 00022300\n", av[0]);
    exit(1);
  }
  sscanf(av[1],"%x",&m);
  if (m < 1 || m > MAXNUM) {
    printf("out of size %d\n",m);
    exit(1);
  }

  time(&t);
  srandom((unsigned int)getpid()^(((unsigned int)t<<16)| (unsigned int)t>>16));

  /* 00/00/00/00 */
  for (i = 0 ; i < m ; i++) {
    r = random() % m;
    sprintf(fname,"00/%2.2x/%2.2x/00%2.2x%2.2x%2.2x",
	   ((r>>16)&0xFF),
	   ((r>>8)&0xFF),
	   ((r>>16)&0xFF),
	   ((r>>8)&0xFF),
	   (r&0xFF));
    create_or_delete(fname);
  }
  fprintf(stderr,"Total create files: %d\n",cfilecount);
  fprintf(stderr,"Total delete files: %d\n",dfilecount);
  fprintf(stderr,"Total error       : %d\n",errorcount);
  exit(0);
}

#define MAXFSIZE (192*1024)
#define AVEFSIZE (MAXFSIZE/2)
#define POOLDISKSPACE (AVEFSIZE*128)

static int disk_space_pool=0;
void create_or_delete(char *fname)
{
  int r;

  r = (random() & 1);
  if (r && disk_space_pool > POOLDISKSPACE) {
    /* create */
    create_file(fname) ;
  }
  else {
    delete_file(fname);
  }
  if ((errorcount > dfilecount ||  errorcount > cfilecount) && (errorcount > MAXERROR)) {
    fprintf(stderr,"too much error -- stop\n");
    fprintf(stderr,"Total create files: %d\n",cfilecount);
    fprintf(stderr,"Total delete files: %d\n",dfilecount);
    fprintf(stderr,"Total error       : %d\n",errorcount);
    exit(1);
  }
}

int create_file(char *filename)
{
  int fd;
  int randomsize;
  char wbuf[MAXFSIZE];
  if ((fd=creat(filename, S_IRWXU)) < 0) {
    errorcount++;
    return(-1);
  }
  if ((randomsize=box_muler(0,MAXFSIZE)) < 0) {
    randomsize = MAXFSIZE;
  }
  if (write(fd,wbuf,randomsize) < 0) {
    errorcount++;
    close(fd);
    return(-1);
  }
  cfilecount++;
  disk_space_pool -= randomsize;
  close(fd);

        return 0;
}

#include <sys/stat.h>
#include <unistd.h>

int delete_file(char *filename)
{
  struct stat buf;
  int st;
  st = stat(filename, &buf);
  if (st < 0) {
    errorcount++;
    return (-1);
  }
  disk_space_pool += buf.st_size;
  if (unlink(filename) < 0) {
    errorcount++;
    return(-1);
  }
  dfilecount++;

        return 0;
}