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/*
* Write a file until filesystem full is reached and then unlink it.
* Demonstrates a particular deadlock that Kaz hit in testing. Run
* several iterations of this in parallel on a near-full filesystem.
*/
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <malloc.h>
#include <sys/mman.h>
#include <sys/stat.h>
int main(int argc, char **argv)
{
int fd, sz, done;
void *ptr;
size_t written;
unsigned int i, count = 0;
unsigned long long bytes = 0;
if (argc < 2) {
fprintf(stderr, "Insufficient arguments\n");
exit(1);
}
if (argc < 3) {
count = (unsigned int)atoi(argv[2]);
}
sz = 1024 * 1024;
ptr = memalign(sz, sz);
if (!ptr) {
perror("memalign");
exit(1);
}
memset(ptr, 0xffffffff, sz);
for (i = 0; i < count; i++) {
fd = open(argv[1], O_CREAT|O_WRONLY, 0666);
if (fd < 0) {
perror(argv[1]);
exit(1);
}
done = 0;
while (!done) {
written = write(fd, ptr, sz);
if (written == -1) {
if (errno == ENOSPC) {
close(fd);
unlink(argv[1]);
printf("Unlinked %s\n", argv[1]);
done = 1;
}
else {
printf("Skipped unlink %s (%s)\n",
argv[1], strerror(errno));
done = -1;
}
}
if (written == 0) {
printf("Wrote zero bytes?\n");
done = -1;
}
bytes += written;
}
if (done > 0)
printf("Wrote %llu bytes total.\n", bytes);
else
exit(1);
}
printf("Completed %u iterations of unlink/out-of-space test.\n", i);
exit(0);
}
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