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/*
* random_exercise.c --- Test program which exercises an ext2
* filesystem. It creates a lot of random files in the current
* directory, while holding some files open while they are being
* deleted. This exercises the orphan list code, as well as
* creating lots of fodder for the ext3 journal.
*
* Copyright (C) 2000 Theodore Ts'o.
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Public
* License.
* %End-Header%
*/
#include "config.h"
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#define MAXFDS 128
struct state {
char name[16];
int state;
int isdir;
};
#define STATE_CLEAR 0
#define STATE_CREATED 1
#define STATE_DELETED 2
struct state state_array[MAXFDS];
#define DATA_SIZE 65536
char data_buffer[DATA_SIZE];
void clear_state_array()
{
int i;
for (i = 0; i < MAXFDS; i++)
state_array[i].state = STATE_CLEAR;
}
int get_random_fd()
{
int fd;
while (1) {
fd = ((int) random()) % MAXFDS;
if (fd > 2)
return fd;
}
}
unsigned int get_inode_num(int fd)
{
struct stat st;
if (fstat(fd, &st) < 0) {
perror("fstat");
return 0;
}
return st.st_ino;
}
void create_random_file()
{
char template[16] = "EX.XXXXXX";
int fd;
int isdir = 0;
int size;
mktemp(template);
isdir = random() & 1;
if (isdir) {
if (mkdir(template, 0700) < 0)
return;
fd = open(template, O_RDONLY, 0600);
printf("Created temp directory %s, fd = %d\n",
template, fd);
} else {
size = random() & (DATA_SIZE-1);
fd = open(template, O_CREAT|O_RDWR, 0600);
write(fd, data_buffer, size);
printf("Created temp file %s, fd = %d, size=%d\n",
template, fd, size);
}
state_array[fd].isdir = isdir;
if (fd < 0)
return;
state_array[fd].isdir = isdir;
state_array[fd].state = STATE_CREATED;
strcpy(state_array[fd].name, template);
}
void truncate_file(int fd)
{
int size;
size = random() & (DATA_SIZE-1);
if (state_array[fd].isdir)
return;
ftruncate(fd, size);
printf("Truncating temp file %s, fd = %d, ino=%u, size=%d\n",
state_array[fd].name, fd, get_inode_num(fd), size);
}
void unlink_file(int fd)
{
char *filename = state_array[fd].name;
printf("Deleting %s, fd = %d, ino = %u\n", filename, fd,
get_inode_num(fd));
if (state_array[fd].isdir)
rmdir(filename);
else
unlink(filename);
state_array[fd].state = STATE_DELETED;
}
void close_file(int fd)
{
char *filename = state_array[fd].name;
printf("Closing %s, fd = %d, ino = %u\n", filename, fd,
get_inode_num(fd));
close(fd);
state_array[fd].state = STATE_CLEAR;
}
main(int argc, char **argv)
{
int i, fd;
memset(data_buffer, 0, sizeof(data_buffer));
sprintf(data_buffer, "This is a test file created by the "
"random_exerciser program\n");
for (i=0; i < 100000; i++) {
fd = get_random_fd();
switch (state_array[fd].state) {
case STATE_CLEAR:
create_random_file();
break;
case STATE_CREATED:
if ((state_array[fd].isdir == 0) &&
(random() & 2))
truncate_file(fd);
else
unlink_file(fd);
break;
case STATE_DELETED:
close_file(fd);
break;
}
}
}
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