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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000-2001 Silicon Graphics, Inc.
* All Rights Reserved.
*/
#include "global.h"
long filesize;
int blocksize;
int count;
int verbose;
off64_t fileoffset;
void usage(char *progname);
void writeblk(int fd);
void truncfile(int fd);
void
usage(char *progname)
{
fprintf(stderr, "usage: %s [-l filesize] [-b blocksize] [-c count] [-s seed] [-o fileoffset (hex)] [-v] filename\n",
progname);
exit(1);
}
int
main(int argc, char *argv[])
{
int seed, i, ch, fd;
char *filename = NULL;
filesize = 256*1024*1024;
blocksize = 512;
count = filesize/blocksize;
verbose = 0;
fileoffset = 0;
seed = time(NULL);
while ((ch = getopt(argc, argv, "b:l:s:c:o:v")) != EOF) {
switch(ch) {
case 'b': blocksize = atoi(optarg); break;
case 'l': filesize = atol(optarg); break;
case 's': seed = atoi(optarg); break;
case 'c': count = atoi(optarg); break;
case 'o': fileoffset = strtoll(optarg, NULL, 16); break;
case 'v': verbose++; break;
default: usage(argv[0]); break;
}
}
if (optind == argc-1)
filename = argv[optind];
else
usage(argv[0]);
printf("Seed = %d (use \"-s %d\" to re-execute this test)\n", seed, seed);
srandom(seed);
/*
* Open the file, write rand block in random places, truncate the file,
* repeat ad-nauseum, then close the file.
*/
if ((fd = open(filename, O_RDWR|O_CREAT|O_TRUNC, 0666)) < 0) {
perror("open");
return 1;
}
for (i = 0; i < count; i++) {
writeblk(fd);
truncfile(fd);
if (verbose && ((i % 100) == 0)) {
printf(".");
fflush(stdout);
}
}
if (close(fd) < 0) {
perror("close");
return 1;
}
return 0;
}
void
writeblk(int fd)
{
off_t offset;
static char *buffer = NULL;
if ((buffer == NULL) && ((buffer = calloc(1, blocksize)) == NULL)) {
perror("malloc");
exit(1);
}
offset = random() % filesize;
if (lseek64(fd, (off64_t)(fileoffset + offset), SEEK_SET) < 0) {
perror("lseek");
exit(1);
}
*(long *)buffer = *(long *)(buffer+256) = (long)offset;
if (write(fd, buffer, blocksize) < blocksize) {
perror("write");
exit(1);
}
if (verbose > 1)
printf("writing data at offset=%llx\n",
(unsigned long long)(fileoffset + offset));
}
void
truncfile(int fd)
{
off_t offset;
offset = random() % filesize;
if (ftruncate64(fd, (off64_t)(fileoffset + offset)) < 0) {
perror("truncate");
exit(1);
}
if (verbose > 1)
printf("truncated file to offset %llx\n",
(unsigned long long)(fileoffset + offset));
}
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